/* ============================================================
   למדתי בחיידר - Main Stylesheet
   Dark theme, RTL, bilingual math learning game
   ============================================================ */

/* ---- CSS Custom Properties ---- */
:root {
  --color-primary: #6C5CE7;
  --color-primary-light: #a29bfe;
  --color-primary-dark: #4a3ab0;
  --color-success: #00B894;
  --color-success-light: #55efc4;
  --color-success-dark: #007a5e;
  --color-accent: #FDCB6E;
  --color-accent-dark: #e0a800;
  --color-danger: #E17055;
  --color-danger-light: #fab1a0;
  --color-danger-dark: #b04030;
  --color-info: #74b9ff;
  --color-bg: #1a1a2e;
  --color-bg-card: #16213e;
  --color-bg-elevated: #0f3460;
  --color-bg-surface: #1e2a45;
  --color-text: #e8e8f0;
  --color-text-muted: #8892a4;
  --color-text-dim: #5a6478;
  --color-border: rgba(255,255,255,0.08);
  --color-border-strong: rgba(255,255,255,0.15);
  --font-primary: 'Heebo', 'Rubik', sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-md: 1.125rem;
  --font-size-lg: 1.25rem;
  --font-size-xl: 1.5rem;
  --font-size-2xl: 1.875rem;
  --font-size-3xl: 2.25rem;
  --font-size-4xl: 3rem;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.5);
  --shadow-glow-primary: 0 0 20px rgba(108,92,231,0.4);
  --shadow-glow-success: 0 0 20px rgba(0,184,148,0.4);
  --shadow-glow-accent: 0 0 20px rgba(253,203,110,0.4);
  --navbar-height: 64px;
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;
  --z-navbar: 100;
  --z-modal: 200;
  --z-popup: 300;
  --z-toast: 400;
}

/* ---- Reset & Base ---- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  direction: rtl;
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-primary);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ---- RTL/LTR Math Overrides ---- */
.math-expr,
.katex,
.katex-display,
[dir="ltr"],
.ltr {
  direction: ltr;
  text-align: left;
  unicode-bidi: embed;
}

.katex { font-size: 1.1em; }
.katex-display { margin: 0.5em 0; }

/* ---- Bilingual Term Styling ---- */
.bilingual-term {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: rgba(108, 92, 231, 0.12);
  border: 1px solid rgba(108, 92, 231, 0.25);
  border-radius: var(--radius-sm);
  padding: 4px 10px;
  font-size: var(--font-size-sm);
  margin: 4px;
  transition: background var(--transition-fast);
}
.bilingual-term:hover { background: rgba(108, 92, 231, 0.2); }
.bilingual-term .term-he { font-weight: 600; color: var(--color-text); }
.bilingual-term .term-en {
  direction: ltr;
  color: var(--color-primary-light);
  font-style: italic;
  font-size: 0.9em;
}
.bilingual-term .term-icon { margin-left: 4px; }
.bilingual-term .term-separator { color: var(--color-text-muted); }

/* ---- Typography ---- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-primary);
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-text);
}

a {
  color: var(--color-primary-light);
  text-decoration: none;
  transition: color var(--transition-fast);
}
a:hover { color: var(--color-accent); }
a:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---- Utility ---- */
.hidden-mobile { display: none; }
@media (min-width: 768px) { .hidden-mobile { display: initial; } }
.visually-hidden {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}
.section-title {
  font-size: var(--font-size-xl);
  font-weight: 800;
  margin-bottom: 1.25rem;
  color: var(--color-text);
  position: relative;
}
.section-title::after {
  content: '';
  display: block;
  width: 40px;
  height: 3px;
  background: var(--color-primary);
  border-radius: 2px;
  margin-top: 6px;
}

/* ---- Navbar ---- */
.navbar {
  position: fixed;
  top: 0; right: 0; left: 0;
  height: var(--navbar-height);
  background: rgba(22, 33, 62, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
  z-index: var(--z-navbar);
  display: flex;
  flex-direction: column;
}

.navbar-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--navbar-height);
  padding: 0 1.25rem;
  gap: 0.75rem;
  max-width: 1400px;
  margin: 0 auto;
  width: 100%;
}

.navbar-logo {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: var(--font-size-lg);
  font-weight: 800;
  color: var(--color-text);
  text-decoration: none;
  white-space: nowrap;
}
.navbar-logo:hover { color: var(--color-accent); }
.logo-icon {
  font-size: 1.4rem;
  color: var(--color-accent);
  animation: spin-slow 8s linear infinite;
}
.logo-math-symbol {
  font-size: 1rem;
  color: var(--color-primary-light);
  opacity: 0.7;
}

.navbar-stats {
  display: none;
  align-items: center;
  gap: 0.75rem;
}
@media (min-width: 640px) { .navbar-stats { display: flex; } }

/* ---- Stat Chips ---- */
.stat-chip {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 5px 12px;
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: 700;
  border: 1px solid transparent;
  transition: transform var(--transition-fast);
  cursor: default;
}
.stat-chip:hover { transform: translateY(-1px); }

.xp-chip {
  background: rgba(108, 92, 231, 0.2);
  border-color: rgba(108, 92, 231, 0.4);
  color: var(--color-primary-light);
}

.streak-chip {
  background: rgba(253, 203, 110, 0.15);
  border-color: rgba(253, 203, 110, 0.35);
  color: var(--color-accent);
}

.stat-icon { font-size: 1rem; }
.stat-value { font-size: var(--font-size-base); font-weight: 800; }
.stat-unit, .stat-label { font-size: var(--font-size-xs); opacity: 0.8; }

.streak-fire-icon { transition: transform var(--transition-fast); }
.fire-animated { animation: fire-pulse 1.5s ease-in-out infinite; }

/* ---- Level Badge (Navbar) ---- */
.level-badge-nav {
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: default;
}
.level-badge-ring {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: conic-gradient(var(--color-primary) 0%, var(--color-primary-light) 50%, var(--color-primary) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-glow-primary);
  position: relative;
}
.level-badge-ring::before {
  content: '';
  position: absolute;
  inset: 3px;
  background: var(--color-bg-card);
  border-radius: 50%;
}
.level-badge-num {
  position: relative;
  font-weight: 900;
  font-size: var(--font-size-sm);
  color: var(--color-accent);
  z-index: 1;
}
.level-badge-info { display: none; flex-direction: column; line-height: 1.2; }
@media (min-width: 900px) { .level-badge-info { display: flex; } }
.level-badge-label { font-size: var(--font-size-xs); color: var(--color-text-muted); }
.level-badge-title { font-size: var(--font-size-xs); font-weight: 600; color: var(--color-primary-light); }

/* ---- User Button & Dropdown ---- */
.user-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  padding: 5px 12px 5px 10px;
  cursor: pointer;
  color: var(--color-text);
  font-family: var(--font-primary);
  font-size: var(--font-size-sm);
  font-weight: 600;
  transition: background var(--transition-fast), border-color var(--transition-fast);
}
.user-btn:hover {
  background: rgba(255,255,255,0.1);
  border-color: var(--color-border-strong);
}

.user-avatar-circle, .user-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: var(--font-size-sm);
  color: #fff;
  flex-shrink: 0;
}
.avatar-letter, .avatar-initials { color: #fff; font-weight: 800; }

.dropdown-caret {
  font-size: 0.8rem;
  transition: transform var(--transition-base);
  color: var(--color-text-muted);
}
.caret-up { transform: rotate(180deg); }
.dropdown-arrow { transition: transform var(--transition-base); }
.dropdown-arrow.rotated { transform: rotate(180deg); }

.nav-user-section, .user-dropdown-wrapper {
  position: relative;
}

.nav-dropdown, .dropdown-menu {
  position: absolute;
  top: calc(100% + 10px);
  left: 0;
  min-width: 220px;
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  z-index: var(--z-modal);
  overflow: hidden;
  padding: 8px;
}
[dir="rtl"] .nav-dropdown,
[dir="rtl"] .dropdown-menu {
  left: auto;
  right: 0;
}

.dropdown-user-info, .dropdown-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 8px;
}
.dropdown-user-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: var(--font-size-base);
  color: #fff;
  flex-shrink: 0;
}
.dropdown-user-details {
  display: flex;
  flex-direction: column;
  line-height: 1.3;
}
.dropdown-user-details strong { font-size: var(--font-size-sm); }
.dropdown-user-details span { font-size: var(--font-size-xs); color: var(--color-text-muted); }

.dropdown-divider { height: 1px; background: var(--color-border); margin: 4px 0; }

.dropdown-link, .dropdown-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 10px;
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-size: var(--font-size-sm);
  font-weight: 500;
  text-decoration: none;
  transition: background var(--transition-fast);
  cursor: pointer;
}
.dropdown-link:hover, .dropdown-item:hover {
  background: rgba(255,255,255,0.07);
  color: var(--color-text);
}
.dropdown-danger, .danger-item { color: var(--color-danger-light) !important; }
.dropdown-danger:hover, .danger-item:hover {
  background: rgba(225, 112, 85, 0.12) !important;
}
.dl-icon, .item-icon { font-size: 1rem; width: 20px; text-align: center; }
.review-badge {
  margin-right: auto;
  background: var(--color-danger);
  color: #fff;
  border-radius: var(--radius-full);
  padding: 1px 7px;
  font-size: 0.7rem;
  font-weight: 700;
}

/* ---- Hamburger ---- */
.hamburger-btn {
  display: flex;
  flex-direction: column;
  gap: 5px;
  width: 36px;
  height: 36px;
  padding: 6px;
  background: none;
  border: none;
  cursor: pointer;
  justify-content: center;
}
@media (min-width: 768px) { .hamburger-btn { display: none; } }
.hamburger-line, .hb-line {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base);
  transform-origin: center;
}
.hamburger-line.open:nth-child(1), .hb-open-1 { transform: translateY(7px) rotate(45deg); }
.hamburger-line.open:nth-child(2), .hb-open-2 { opacity: 0; }
.hamburger-line.open:nth-child(3), .hb-open-3 { transform: translateY(-7px) rotate(-45deg); }

/* ---- Mobile Menu ---- */
.mobile-menu, .mobile-nav-menu {
  background: var(--color-bg-elevated);
  border-top: 1px solid var(--color-border);
  padding: 1rem 1.25rem;
}
.mobile-stats, .mobile-stats-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}
.mobile-nav, .mobile-nav-links {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.mobile-nav-item, .mobile-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-size: var(--font-size-base);
  font-weight: 500;
  text-decoration: none;
  transition: background var(--transition-fast);
}
.mobile-nav-item:hover, .mobile-link:hover {
  background: rgba(255,255,255,0.07);
}
.mobile-danger-link { color: var(--color-danger-light); }
.ml-icon { width: 20px; text-align: center; }

/* ---- Main Content ---- */
.main-content {
  margin-top: var(--navbar-height);
  min-height: calc(100vh - var(--navbar-height) - 120px);
  padding: 2rem 1.25rem;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  margin-top: calc(var(--navbar-height) + 1rem);
}

/* ---- Flash Messages ---- */
.flash-container {
  position: fixed;
  top: calc(var(--navbar-height) + 10px);
  left: 50%;
  transform: translateX(-50%);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 300px;
  max-width: 90vw;
}
.flash-message {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: 600;
  box-shadow: var(--shadow-md);
  animation: slide-in-right 0.3s ease;
}
.flash-success { background: var(--color-success); color: #fff; }
.flash-error { background: var(--color-danger); color: #fff; }
.flash-info { background: var(--color-primary); color: #fff; }
.flash-warning { background: var(--color-accent); color: #1a1a2e; }
.flash-close {
  background: none;
  border: none;
  color: inherit;
  cursor: pointer;
  padding: 0 0 0 8px;
  opacity: 0.8;
  font-size: 1rem;
}
.flash-close:hover { opacity: 1; }

/* ---- XP Popup Container ---- */
#xp-popup-container {
  position: fixed;
  bottom: 20%;
  left: 50%;
  transform: translateX(-50%);
  pointer-events: none;
  z-index: var(--z-popup);
}

/* ---- Cards ---- */
.card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: 1.5rem;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}
.card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius-md);
  font-family: var(--font-primary);
  font-size: var(--font-size-base);
  font-weight: 700;
  border: 2px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition-base);
  white-space: nowrap;
  position: relative;
  overflow: hidden;
  -webkit-tap-highlight-color: transparent;
}
.btn:active { transform: scale(0.97); }
.btn:focus-visible {
  outline: 2px solid var(--color-primary-light);
  outline-offset: 3px;
}
.btn:disabled, .btn[disabled] {
  opacity: 0.45;
  cursor: not-allowed;
  pointer-events: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: #fff;
  border-color: transparent;
  box-shadow: var(--shadow-glow-primary);
}
.btn-primary:hover {
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
  transform: translateY(-1px);
  box-shadow: 0 6px 24px rgba(108,92,231,0.5);
}

.btn-success {
  background: linear-gradient(135deg, var(--color-success), var(--color-success-light));
  color: #fff;
  border-color: transparent;
  box-shadow: var(--shadow-glow-success);
}
.btn-success:hover {
  background: linear-gradient(135deg, var(--color-success-dark), var(--color-success));
  transform: translateY(-1px);
}

.btn-danger {
  background: linear-gradient(135deg, var(--color-danger), var(--color-danger-light));
  color: #fff;
  border-color: transparent;
}
.btn-danger:hover {
  background: linear-gradient(135deg, var(--color-danger-dark), var(--color-danger));
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  border-color: var(--color-border-strong);
  color: var(--color-text);
}
.btn-outline:hover {
  background: rgba(255,255,255,0.07);
  border-color: var(--color-primary-light);
  color: var(--color-primary-light);
}

.btn-ghost {
  background: transparent;
  border-color: transparent;
  color: var(--color-text-muted);
}
.btn-ghost:hover { background: rgba(255,255,255,0.07); color: var(--color-text); }

.btn-sm { padding: 6px 14px; font-size: var(--font-size-sm); border-radius: var(--radius-sm); }
.btn-lg { padding: 14px 28px; font-size: var(--font-size-lg); border-radius: var(--radius-lg); }
.btn-xl { padding: 18px 40px; font-size: var(--font-size-xl); border-radius: var(--radius-xl); }
.btn-full { width: 100%; }
.btn-loading { pointer-events: none; opacity: 0.75; }
.loading-spinner { display: inline-block; animation: spin 0.8s linear infinite; }
.loading-dots { animation: pulse 1.2s ease infinite; }

/* ---- Form Styles ---- */
.form-group { margin-bottom: 1.25rem; }
.form-label {
  display: block;
  font-weight: 600;
  font-size: var(--font-size-sm);
  margin-bottom: 6px;
  color: var(--color-text);
}
.label-en {
  font-style: italic;
  font-weight: 400;
  color: var(--color-text-muted);
  font-size: 0.85em;
  margin-right: 4px;
  direction: ltr;
  display: inline;
}
.label-hint {
  font-weight: 400;
  color: var(--color-text-dim);
  font-size: 0.8em;
  display: block;
  margin-top: 2px;
}

.input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}
.input-icon {
  position: absolute;
  right: 14px;
  font-size: 1rem;
  pointer-events: none;
  z-index: 1;
}
.form-input {
  width: 100%;
  padding: 13px 44px 13px 14px;
  background: var(--color-bg-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-family: var(--font-primary);
  font-size: var(--font-size-base);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  -webkit-appearance: none;
}
.form-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(108, 92, 231, 0.2);
}
.form-input::placeholder { color: var(--color-text-dim); }
.form-group.has-error .form-input { border-color: var(--color-danger); }
.form-group.has-error .form-input:focus {
  box-shadow: 0 0 0 3px rgba(225, 112, 85, 0.2);
}

.password-toggle {
  position: absolute;
  left: 12px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  font-size: 1rem;
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}
.password-toggle:hover { color: var(--color-text); }

.input-status {
  position: absolute;
  left: 44px;
  font-weight: 700;
  font-size: 0.9rem;
}
.input-status.valid { color: var(--color-success); }
.input-status.invalid { color: var(--color-danger); }

.field-error {
  display: block;
  color: var(--color-danger-light);
  font-size: var(--font-size-xs);
  margin-top: 4px;
  font-weight: 600;
}
.field-hint {
  display: block;
  color: var(--color-text-dim);
  font-size: var(--font-size-xs);
  margin-top: 4px;
}
.form-error-banner {
  background: rgba(225, 112, 85, 0.15);
  border: 1px solid var(--color-danger);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--color-danger-light);
  font-size: var(--font-size-sm);
  font-weight: 600;
}

/* Password Strength */
.password-strength {
  margin-top: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.strength-bars { display: flex; gap: 4px; }
.strength-bar {
  width: 36px;
  height: 4px;
  background: var(--color-bg-elevated);
  border-radius: 2px;
  transition: background var(--transition-base);
}
.strength-bar.active:nth-child(1) { background: var(--color-danger); }
.strength-bar.active:nth-child(2) { background: var(--color-accent); }
.strength-bar.active:nth-child(3) { background: var(--color-success-light); }
.strength-bar.active:nth-child(4) { background: var(--color-success); }
.strength-label { font-size: var(--font-size-xs); color: var(--color-text-muted); font-weight: 600; }

/* ---- Auth Pages ---- */
.auth-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem 1rem;
  position: relative;
  overflow: hidden;
  margin-top: calc(-1 * var(--navbar-height));
  padding-top: calc(var(--navbar-height) + 2rem);
}

.auth-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 2.5rem 2rem;
  width: 100%;
  max-width: 420px;
  box-shadow: var(--shadow-lg);
  position: relative;
  z-index: 1;
}
.auth-card-wide { max-width: 500px; }

.auth-header { text-align: center; margin-bottom: 2rem; }
.auth-logo-link { display: inline-block; margin-bottom: 0.75rem; }
.auth-logo {
  width: 70px;
  height: 70px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto;
  box-shadow: var(--shadow-glow-primary);
}
.auth-logo-icon { font-size: 2rem; color: var(--color-accent); }
.auth-app-name {
  font-size: var(--font-size-2xl);
  font-weight: 900;
  color: var(--color-text);
  margin-bottom: 0.5rem;
}
.auth-tagline {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

.auth-form { margin-bottom: 1.5rem; }
.auth-footer { text-align: center; font-size: var(--font-size-sm); color: var(--color-text-muted); }
.auth-link {
  display: inline-block;
  margin-top: 6px;
  font-weight: 700;
  color: var(--color-primary-light);
  font-size: var(--font-size-base);
}
.auth-link:hover { color: var(--color-accent); }

/* Floating Math Background */
.math-bg {
  position: fixed;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  z-index: 0;
}
.math-symbol {
  position: absolute;
  left: var(--pos-x);
  top: var(--pos-y);
  font-size: var(--size, 2rem);
  color: var(--color-primary);
  opacity: 0.08;
  animation: float-symbol 6s ease-in-out infinite;
  animation-delay: var(--delay, 0s);
  font-weight: 700;
  user-select: none;
}

/* ---- Progress Bars ---- */
.progress-bar-track {
  width: 100%;
  height: 12px;
  background: var(--color-bg-elevated);
  border-radius: var(--radius-full);
  overflow: hidden;
  position: relative;
}
.progress-bar-fill {
  height: 100%;
  border-radius: var(--radius-full);
  transition: width var(--transition-slow) ease;
  position: relative;
}
.gradient-fill {
  background: linear-gradient(90deg, var(--color-primary), var(--color-primary-light), var(--color-accent));
  background-size: 200% 100%;
  animation: shimmer 3s ease infinite;
}
.progress-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
  font-size: var(--font-size-sm);
  font-weight: 600;
}
.progress-pct { color: var(--color-accent); font-weight: 800; }

/* XP Progress Bar */
.xp-progress-wrapper { margin-bottom: 0.5rem; }
.xp-progress-bar, .xp-bar-track {
  width: 100%;
  height: 20px;
  background: var(--color-bg-elevated);
  border-radius: var(--radius-full);
  overflow: hidden;
  position: relative;
  border: 1px solid var(--color-border);
}
.xp-progress-fill, .xp-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-primary-light));
  border-radius: var(--radius-full);
  transition: width 1s cubic-bezier(0.4,0,0.2,1);
  position: relative;
}
.xp-progress-fill::after, .xp-bar-fill::after {
  content: '';
  position: absolute;
  top: 0; right: 0; bottom: 0;
  width: 40px;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3));
  animation: shimmer-right 2s ease infinite;
}
.xp-progress-label {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-xs);
  font-weight: 700;
  color: #fff;
  text-shadow: 0 1px 2px rgba(0,0,0,0.5);
}
.xp-to-next {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  text-align: center;
  margin-top: 4px;
}
.xp-to-next strong { color: var(--color-accent); }

/* ---- Home Dashboard ---- */
.page-home {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

.welcome-hero {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 2rem;
  position: relative;
  overflow: hidden;
}
.welcome-hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -20%;
  width: 70%;
  height: 200%;
  background: radial-gradient(ellipse, rgba(108,92,231,0.08) 0%, transparent 70%);
  pointer-events: none;
}
@media (min-width: 768px) {
  .welcome-hero { flex-direction: row; align-items: center; justify-content: space-between; }
}
.welcome-greeting { font-size: var(--font-size-lg); color: var(--color-text-muted); margin-bottom: 4px; }
.welcome-name { font-size: var(--font-size-3xl); font-weight: 900; margin-bottom: 4px; }
.welcome-subtitle { color: var(--color-text-muted); font-size: var(--font-size-base); }

.continue-btn {
  margin-top: 1.25rem;
  gap: 10px;
  flex-direction: column;
  align-items: flex-start;
  padding: 16px 28px;
}
@media (min-width: 768px) { .continue-btn { flex-direction: row; align-items: center; } }
.btn-icon { font-size: 1.2rem; }
.topic-name {
  font-size: var(--font-size-sm);
  font-weight: 500;
  opacity: 0.85;
}

.level-progress-card {
  background: var(--color-bg-elevated);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  min-width: 280px;
}
.level-info {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}
.current-level-badge, .next-level-badge {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  font-size: var(--font-size-lg);
  color: #fff;
  box-shadow: var(--shadow-glow-primary);
  flex-shrink: 0;
}
.next-level-badge { background: var(--color-bg-surface); opacity: 0.6; }
.level-text { flex: 1; }
.level-title { display: block; font-weight: 700; font-size: var(--font-size-base); }
.level-subtitle { display: block; font-size: var(--font-size-xs); color: var(--color-text-muted); direction: ltr; }

/* ---- Daily Goals ---- */
.daily-goals-section {}
.daily-goals-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}
.goal-circle-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.25rem 0.75rem;
  text-align: center;
  transition: transform var(--transition-base);
}
.goal-circle-card:hover { transform: translateY(-2px); }
.goal-circle-wrapper {
  position: relative;
  width: 80px;
  height: 80px;
  margin: 0 auto 0.75rem;
}
.goal-circle-svg {
  width: 80px;
  height: 80px;
  transform: rotate(-90deg);
}
.goal-bg { fill: none; stroke: var(--color-bg-elevated); stroke-width: 8; }
.goal-fill {
  fill: none;
  stroke-width: 8;
  stroke-linecap: round;
  transition: stroke-dashoffset 1s cubic-bezier(0.4,0,0.2,1);
}
.goal-problems { stroke: var(--color-primary); }
.goal-lesson { stroke: var(--color-success); }
.goal-review { stroke: var(--color-accent); }
.goal-circle-text {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-sm);
  font-weight: 700;
  gap: 1px;
}
.goal-done { color: var(--color-text); font-weight: 900; }
.goal-sep { color: var(--color-text-dim); font-size: 0.7rem; }
.goal-target { color: var(--color-text-muted); font-size: 0.8rem; }
.goal-label { font-size: var(--font-size-sm); font-weight: 700; color: var(--color-text); }
.goal-label-en { font-size: var(--font-size-xs); color: var(--color-text-muted); direction: ltr; }

/* ---- Quick Stats ---- */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}
@media (min-width: 640px) { .stats-grid { grid-template-columns: repeat(4, 1fr); } }

.stat-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  text-align: center;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}
.stat-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
.stat-card-icon { font-size: 2rem; margin-bottom: 8px; }
.stat-card-value {
  font-size: var(--font-size-2xl);
  font-weight: 900;
  color: var(--color-accent);
  display: block;
}
.stat-card-label { font-size: var(--font-size-sm); font-weight: 600; color: var(--color-text); }
.stat-card-label-en { font-size: var(--font-size-xs); color: var(--color-text-muted); direction: ltr; }

/* ---- Streak Calendar ---- */
.streak-section {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 1.5rem;
}
.streak-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
  gap: 0.75rem;
}
.streak-count { display: flex; align-items: center; gap: 8px; }
.streak-fire-big { font-size: 2rem; }
.streak-days-big { font-size: var(--font-size-3xl); font-weight: 900; color: var(--color-accent); }
.streak-label-big { font-size: var(--font-size-sm); color: var(--color-text-muted); }

.streak-calendar {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
  flex-wrap: wrap;
}
.streak-day {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  cursor: default;
}
.streak-day-dot {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 2px solid var(--color-border);
  transition: all var(--transition-base);
}
.streak-active .streak-day-dot {
  background: var(--color-accent);
  border-color: var(--color-accent);
  box-shadow: 0 0 10px rgba(253, 203, 110, 0.4);
}
.streak-today .streak-day-dot {
  border-color: var(--color-primary-light);
  box-shadow: 0 0 8px rgba(108, 92, 231, 0.5);
}
.streak-day-label { font-size: var(--font-size-xs); color: var(--color-text-muted); font-weight: 600; }

/* ---- Achievement Mini Cards ---- */
.achievements-section {}
.achievements-row {
  display: flex;
  gap: 1rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}
.achievement-mini-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1rem;
  text-align: center;
  width: 120px;
  transition: transform var(--transition-base);
}
.achievement-mini-card:hover { transform: translateY(-3px); }
.achievement-mini-card.earned { border-color: var(--color-accent); }
.badge-icon-wrapper { font-size: 2.5rem; margin-bottom: 6px; }
.badge-name { font-size: var(--font-size-xs); font-weight: 700; color: var(--color-text); }
.badge-name-en { font-size: 0.65rem; color: var(--color-text-muted); direction: ltr; }

/* ---- World Map ---- */
.page-map {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}
.page-header { text-align: center; margin-bottom: 0.5rem; }
.page-title { font-size: var(--font-size-3xl); font-weight: 900; }
.page-subtitle { color: var(--color-text-muted); font-size: var(--font-size-lg); }

.overall-progress {
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  padding: 1rem 1.5rem;
}

.worlds-grid {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.world-card {
  background: var(--color-bg-card);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}
.world-card:hover { box-shadow: var(--shadow-md); }
.world-card.world-green { border-color: rgba(0,184,148,0.3); }
.world-card.world-green:hover { border-color: var(--color-success); box-shadow: var(--shadow-glow-success); }
.world-card.world-blue { border-color: rgba(116,185,255,0.3); }
.world-card.world-blue:hover { border-color: var(--color-info); }
.world-card.world-purple { border-color: rgba(108,92,231,0.3); }
.world-card.world-purple:hover { border-color: var(--color-primary); box-shadow: var(--shadow-glow-primary); }
.world-card.world-orange { border-color: rgba(253,203,110,0.3); }
.world-card.world-orange:hover { border-color: var(--color-accent); box-shadow: var(--shadow-glow-accent); }
.world-card.world-deep-blue { border-color: rgba(108,92,231,0.2); }
.world-card.locked { opacity: 0.65; filter: grayscale(0.4); }

.world-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.25rem 1.5rem;
  cursor: pointer;
  user-select: none;
}
.world-icon { font-size: 2.5rem; flex-shrink: 0; }
.world-info { flex: 1; min-width: 0; }
.world-title-he { font-size: var(--font-size-xl); font-weight: 800; margin-bottom: 2px; }
.world-title-en { font-size: var(--font-size-sm); color: var(--color-text-muted); direction: ltr; margin-bottom: 2px; }
.world-grades { font-size: var(--font-size-xs); color: var(--color-text-dim); }
.grades-label { font-weight: 600; }

.world-meta { flex-shrink: 0; text-align: center; }
.lock-icon { font-size: 1.5rem; }
.unlock-hint { font-size: var(--font-size-xs); color: var(--color-text-muted); margin-top: 4px; max-width: 80px; }

.completion-ring { position: relative; width: 60px; height: 60px; }
.ring-svg { width: 60px; height: 60px; transform: rotate(-90deg); }
.ring-bg { fill: none; stroke: var(--color-bg-elevated); stroke-width: 6; }
.ring-fill { fill: none; stroke: var(--color-success); stroke-width: 6; stroke-linecap: round; transition: stroke-dashoffset 1s ease; }
.ring-pct {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-xs);
  font-weight: 800;
  color: var(--color-text);
}

.world-expand-arrow {
  font-size: 1.25rem;
  color: var(--color-text-muted);
  transition: transform var(--transition-base);
  flex-shrink: 0;
}
.world-expand-arrow.rotated { transform: rotate(180deg); }

.world-progress-bar {
  height: 6px;
  background: var(--color-bg-elevated);
  position: relative;
  overflow: hidden;
}
.world-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-success), var(--color-success-light));
  transition: width 1s ease;
}
.world-topic-count {
  position: absolute;
  left: 8px;
  top: -18px;
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

/* Topics Path */
.topics-path { padding: 1rem 1.5rem 1.5rem; }
.topics-path-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  justify-content: flex-end;
}

.topic-node-wrapper {
  display: flex;
  align-items: center;
  gap: 8px;
}

.topic-connector {
  width: 24px;
  height: 3px;
  border-radius: 2px;
  flex-shrink: 0;
}
.connector-done { background: var(--color-success); }
.connector-available { background: var(--color-border-strong); }
.connector-locked { background: var(--color-border); }

.topic-node {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  width: 80px;
  padding: 8px 4px;
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  text-decoration: none;
  color: var(--color-text);
  transition: all var(--transition-base);
  text-align: center;
  cursor: pointer;
  position: relative;
}
.topic-node:hover { transform: translateY(-3px); box-shadow: var(--shadow-sm); }
.topic-node.completed {
  background: rgba(0,184,148,0.15);
  border-color: var(--color-success);
}
.topic-node.available {
  background: rgba(108,92,231,0.1);
  border-color: rgba(108,92,231,0.4);
}
.topic-node.locked {
  background: var(--color-bg-elevated);
  border-color: var(--color-border);
  opacity: 0.7;
  cursor: not-allowed;
}
.topic-node.locked:hover { transform: none; box-shadow: none; }

.boss-node {
  width: 90px;
  background: rgba(225,112,85,0.15) !important;
  border-color: var(--color-danger) !important;
}
.boss-icon { font-size: 1.5rem; }
.node-number {
  width: 28px;
  height: 28px;
  background: var(--color-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: var(--font-size-sm);
  color: #fff;
}
.node-check {
  width: 28px;
  height: 28px;
  background: var(--color-success);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  color: #fff;
}
.node-lock { font-size: 1.25rem; }
.node-label { font-size: 0.65rem; font-weight: 600; line-height: 1.2; color: var(--color-text); }
.node-label-en { font-size: 0.55rem; color: var(--color-text-muted); direction: ltr; }
.node-stars { display: flex; gap: 1px; }
.node-star { font-size: 0.7rem; color: var(--color-border-strong); }
.node-star.earned { color: var(--color-accent); }

/* ---- Lesson Page ---- */
.page-lesson { display: flex; flex-direction: column; gap: 0; }

.lesson-header {
  background: var(--color-bg-card);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: var(--navbar-height);
  z-index: 10;
}
.lesson-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  gap: 1rem;
}
.back-btn { flex-shrink: 0; }
.lesson-topic-info { flex: 1; text-align: center; }
.lesson-topic-he { font-size: var(--font-size-lg); font-weight: 800; }
.lesson-topic-en { font-size: var(--font-size-xs); color: var(--color-text-muted); direction: ltr; }
.lesson-progress-info { text-align: left; flex-shrink: 0; }
.progress-text { font-size: var(--font-size-lg); font-weight: 800; color: var(--color-accent); }
.progress-label { font-size: var(--font-size-xs); color: var(--color-text-muted); display: block; }
.lesson-progress-bar { height: 4px; background: var(--color-bg-elevated); }
.lesson-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  transition: width var(--transition-slow);
}

/* Concept Section */
.concept-section { padding: 1.5rem; }
.concept-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 1.5rem;
  border-right: 4px solid var(--color-primary);
}
.concept-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 1rem;
}
.concept-icon { font-size: 1.5rem; }
.concept-title { font-size: var(--font-size-lg); font-weight: 800; }
.concept-text-he { font-size: var(--font-size-base); line-height: 1.8; margin-bottom: 0.75rem; }
.concept-text-en { font-size: var(--font-size-sm); color: var(--color-text-muted); direction: ltr; line-height: 1.7; }

.key-terms-box {
  background: var(--color-bg-elevated);
  border-radius: var(--radius-md);
  padding: 1rem;
  margin-top: 1rem;
}
.key-terms-title { font-size: var(--font-size-sm); font-weight: 700; margin-bottom: 0.75rem; color: var(--color-text-muted); }
.key-terms-grid { display: flex; flex-wrap: wrap; gap: 4px; }

/* Problem Section */
.problem-section { padding: 1.5rem; padding-top: 0.75rem; }

.problem-card {
  background: var(--color-bg-card);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 2rem;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
  position: relative;
  min-height: 400px;
  display: flex;
  flex-direction: column;
}
.problem-card.problem-correct {
  border-color: var(--color-success);
  box-shadow: 0 0 30px rgba(0, 184, 148, 0.2);
}
.problem-card.problem-wrong {
  border-color: var(--color-danger);
  box-shadow: 0 0 20px rgba(225, 112, 85, 0.15);
}

.problem-num-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--color-primary);
  border-radius: 50%;
  font-weight: 900;
  font-size: var(--font-size-sm);
  color: #fff;
  margin-bottom: 1rem;
}

.problem-text { margin-bottom: 1.25rem; }
.problem-text-he { font-size: var(--font-size-xl); font-weight: 600; line-height: 1.6; margin-bottom: 8px; }
.problem-text-en { font-size: var(--font-size-sm); color: var(--color-text-muted); direction: ltr; }

.math-expression-wrapper {
  background: var(--color-bg-elevated);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin: 1rem 0;
  text-align: center;
  font-size: 1.4rem;
  border: 1px solid var(--color-border);
}

/* Answer Area */
.answer-area { margin: 1.25rem 0; }

.multiple-choice-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
}
.choice-btn {
  padding: 14px;
  background: var(--color-bg-elevated);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  color: var(--color-text);
  font-family: var(--font-primary);
  font-size: var(--font-size-lg);
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition-base);
  text-align: center;
  direction: ltr;
}
.choice-btn:hover:not(:disabled) {
  border-color: var(--color-primary);
  background: rgba(108,92,231,0.1);
  transform: translateY(-2px);
}
.choice-btn.selected {
  border-color: var(--color-primary);
  background: rgba(108,92,231,0.2);
  box-shadow: var(--shadow-glow-primary);
}
.choice-btn.correct-choice {
  border-color: var(--color-success) !important;
  background: rgba(0,184,148,0.2) !important;
  color: var(--color-success-light) !important;
}
.choice-btn.wrong-choice {
  border-color: var(--color-danger) !important;
  background: rgba(225,112,85,0.15) !important;
}

.answer-input, .number-input-wrapper input {
  width: 100%;
  max-width: 240px;
  padding: 14px 20px;
  background: var(--color-bg-elevated);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  color: var(--color-text);
  font-family: var(--font-primary);
  font-size: var(--font-size-2xl);
  font-weight: 700;
  text-align: center;
  direction: ltr;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.answer-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(108,92,231,0.2);
}

.problem-actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  align-items: center;
  margin-top: 1.5rem;
}
.submit-btn { min-width: 160px; }

.hint-panel, .explanation-panel {
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1rem;
  margin-top: 1rem;
}
.hint-header, .explanation-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 6px;
  font-size: var(--font-size-sm);
}
.hint-text, .explanation-text { font-size: var(--font-size-sm); line-height: 1.7; }

/* Feedback Overlay */
.feedback-overlay {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  gap: 1.25rem;
  flex: 1;
}
.feedback-correct { text-align: center; color: var(--color-success-light); }
.feedback-wrong { text-align: center; color: var(--color-danger-light); }
.feedback-icon-big { font-size: 4rem; margin-bottom: 0.5rem; animation: bounce-in 0.5s ease; }
.feedback-title { font-size: var(--font-size-2xl); font-weight: 900; margin-bottom: 6px; }
.feedback-msg { font-size: var(--font-size-base); color: var(--color-text-muted); }
.xp-gained {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: rgba(253,203,110,0.15);
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-full);
  padding: 6px 16px;
  margin-top: 8px;
  color: var(--color-accent);
  font-weight: 800;
  font-size: var(--font-size-lg);
}
.correct-answer-reveal {
  margin-top: 8px;
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}
.answer-label { margin-left: 8px; }
.answer-value { font-weight: 800; color: var(--color-success); direction: ltr; }
.next-btn { margin-top: 0.5rem; }

/* ---- Lesson Complete Modal ---- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.7);
  z-index: var(--z-modal);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}
.modal-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 2.5rem;
  max-width: 460px;
  width: 100%;
  box-shadow: var(--shadow-lg);
  position: relative;
  animation: bounce-in 0.4s ease;
}
.celebration-modal { text-align: center; border-color: var(--color-accent); }
.celebration-icon { font-size: 4rem; margin-bottom: 1rem; animation: spin-slow 3s ease-in-out infinite; }
.celebration-title { font-size: var(--font-size-3xl); font-weight: 900; margin-bottom: 4px; }
.celebration-subtitle { color: var(--color-text-muted); margin-bottom: 1.5rem; }
.lesson-results { display: flex; flex-direction: column; gap: 10px; margin-bottom: 1.5rem; }
.result-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  background: var(--color-bg-elevated);
  border-radius: var(--radius-md);
}
.result-icon { font-size: 1.2rem; }
.result-label { flex: 1; font-size: var(--font-size-sm); font-weight: 600; }
.result-value { font-size: var(--font-size-base); font-weight: 800; color: var(--color-accent); }
.stars-earned { display: flex; justify-content: center; gap: 8px; font-size: 2.5rem; margin-bottom: 1.5rem; }
.earned-star { color: var(--color-border-strong); transition: all var(--transition-base); }
.earned-star.star-lit { color: var(--color-accent); filter: drop-shadow(0 0 8px rgba(253,203,110,0.6)); }
.celebration-actions { display: flex; gap: 0.75rem; justify-content: center; flex-wrap: wrap; }

/* ---- Profile Page ---- */
.profile-hero {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
  text-align: center;
  margin-bottom: 2rem;
}
@media (min-width: 768px) {
  .profile-hero { flex-direction: row; text-align: right; }
}

.profile-avatar-large {
  width: 90px;
  height: 90px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  box-shadow: var(--shadow-glow-primary);
  flex-shrink: 0;
}
.avatar-initials-large { font-size: 2.5rem; font-weight: 900; color: #fff; }
.avatar-level-badge {
  position: absolute;
  bottom: -4px;
  left: -4px;
  width: 28px;
  height: 28px;
  background: var(--color-accent);
  border-radius: 50%;
  border: 2px solid var(--color-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-xs);
  font-weight: 900;
  color: #1a1a2e;
}
.profile-name { font-size: var(--font-size-3xl); font-weight: 900; }
.profile-username { color: var(--color-text-muted); font-size: var(--font-size-sm); margin-bottom: 4px; }
.profile-level-title { display: flex; align-items: center; gap: 6px; font-size: var(--font-size-base); margin-bottom: 4px; }
.level-title-he { font-weight: 700; color: var(--color-primary-light); }
.level-title-sep { color: var(--color-text-dim); }
.level-title-en { color: var(--color-text-muted); font-style: italic; direction: ltr; }
.profile-joined { font-size: var(--font-size-xs); color: var(--color-text-dim); }
.profile-xp-section { width: 100%; max-width: 400px; }
.xp-level-row { display: flex; align-items: center; gap: 10px; margin-bottom: 6px; }
.xp-level-badge-sm {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  font-size: var(--font-size-sm);
  color: #fff;
  flex-shrink: 0;
}
.xp-level-badge-sm.next-level { background: var(--color-bg-elevated); opacity: 0.6; }
.xp-bar-wrapper { flex: 1; }
.xp-bar-labels { display: flex; justify-content: space-between; font-size: var(--font-size-xs); color: var(--color-text-muted); margin-top: 4px; }
.xp-total-display { text-align: center; font-size: var(--font-size-sm); color: var(--color-text-muted); }
.xp-total-display strong { color: var(--color-accent); }

.profile-stats-grid, .profile-stats-section {
  margin-bottom: 2rem;
}
.profile-stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}
@media (min-width: 640px) { .profile-stats-grid { grid-template-columns: repeat(3, 1fr); } }
@media (min-width: 900px) { .profile-stats-grid { grid-template-columns: repeat(6, 1fr); } }

.profile-stat-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.25rem 0.75rem;
  text-align: center;
  transition: transform var(--transition-base);
}
.profile-stat-card:hover { transform: translateY(-2px); }
.pstat-icon { font-size: 1.75rem; margin-bottom: 6px; }
.pstat-value { font-size: var(--font-size-xl); font-weight: 900; color: var(--color-accent); display: block; }
.pstat-label { font-size: var(--font-size-xs); font-weight: 600; }
.pstat-label-en { font-size: 0.65rem; color: var(--color-text-muted); direction: ltr; }

.streak-calendar-30 {
  display: grid;
  grid-template-columns: repeat(10, 1fr);
  gap: 5px;
  margin-bottom: 10px;
}
@media (min-width: 480px) { .streak-calendar-30 { grid-template-columns: repeat(15, 1fr); } }

.streak-cell {
  aspect-ratio: 1;
  border-radius: 3px;
  transition: transform var(--transition-fast);
  cursor: default;
}
.streak-cell:hover { transform: scale(1.2); }
.streak-cell.inactive { background: var(--color-bg-elevated); border: 1px solid var(--color-border); }
.streak-cell.active { background: var(--color-success); opacity: calc(0.4 + var(--intensity, 0.5) * 0.6); }

.streak-legend { display: flex; align-items: center; gap: 8px; font-size: var(--font-size-xs); color: var(--color-text-muted); }
.legend-cells { display: flex; gap: 3px; }
.legend-cell { width: 14px; height: 14px; border-radius: 2px; }
.legend-cell.l0 { background: var(--color-bg-elevated); border: 1px solid var(--color-border); }
.legend-cell.l1 { background: var(--color-success); opacity: 0.3; }
.legend-cell.l2 { background: var(--color-success); opacity: 0.5; }
.legend-cell.l3 { background: var(--color-success); opacity: 0.7; }
.legend-cell.l4 { background: var(--color-success); opacity: 1; }

/* Achievements Grid */
.achievements-count { color: var(--color-text-muted); font-size: var(--font-size-sm); margin-bottom: 1rem; }
.achievements-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}
@media (min-width: 480px) { .achievements-grid { grid-template-columns: repeat(3, 1fr); } }
@media (min-width: 768px) { .achievements-grid { grid-template-columns: repeat(4, 1fr); } }
@media (min-width: 1024px) { .achievements-grid { grid-template-columns: repeat(6, 1fr); } }

.achievement-card {
  background: var(--color-bg-card);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1rem 0.75rem;
  text-align: center;
  transition: transform var(--transition-base), border-color var(--transition-base);
  position: relative;
}
.achievement-card:hover { transform: translateY(-2px); }
.achievement-card.earned { border-color: var(--color-accent); }
.achievement-card.earned:hover { box-shadow: var(--shadow-glow-accent); }
.achievement-card.unearned { opacity: 0.55; filter: grayscale(0.3); }

.badge-icon-big { font-size: 2.5rem; margin-bottom: 6px; }
.badge-locked { font-size: 2rem; color: var(--color-text-dim); }
.badge-name-profile { font-size: var(--font-size-xs); font-weight: 700; }
.badge-name-en-profile { font-size: 0.65rem; color: var(--color-text-muted); direction: ltr; }
.badge-earned-date { font-size: 0.6rem; color: var(--color-text-dim); margin-top: 2px; }
.badge-earned-check {
  position: absolute;
  top: -6px;
  left: -6px;
  width: 20px;
  height: 20px;
  background: var(--color-success);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.65rem;
  color: #fff;
  font-weight: 700;
}

/* ---- Quiz (Boss Battle) ---- */
.page-quiz { min-height: calc(100vh - var(--navbar-height)); }

.quiz-intro {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - var(--navbar-height) - 3rem);
}
.boss-battle-intro {
  background: var(--color-bg-card);
  border: 2px solid var(--color-danger);
  border-radius: var(--radius-xl);
  padding: 3rem 2rem;
  text-align: center;
  max-width: 480px;
  box-shadow: 0 0 40px rgba(225,112,85,0.2);
  animation: pulse-border 2s ease infinite;
}
.boss-icon-dramatic { font-size: 5rem; animation: spin-slow 4s ease-in-out infinite; margin-bottom: 1rem; }
.boss-title { font-size: var(--font-size-4xl); font-weight: 900; color: var(--color-danger-light); margin-bottom: 4px; }
.boss-world { font-size: var(--font-size-xl); font-weight: 700; margin-bottom: 2px; }
.boss-subtitle { color: var(--color-text-muted); font-size: var(--font-size-sm); direction: ltr; margin-bottom: 1rem; }
.boss-desc { color: var(--color-text-muted); margin-bottom: 1.5rem; }
.boss-stakes { display: flex; justify-content: center; gap: 1rem; flex-wrap: wrap; margin-bottom: 2rem; }
.stake-item {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--color-bg-elevated);
  border-radius: var(--radius-full);
  padding: 6px 14px;
  font-size: var(--font-size-sm);
  font-weight: 600;
}
.battle-start-btn { animation: glow-danger 2s ease infinite; }

.battle-header {
  background: var(--color-bg-card);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: var(--navbar-height);
  z-index: 10;
}
.battle-header-inner, .battle-header {
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}
.battle-info { display: flex; align-items: center; gap: 8px; }
.battle-label { font-weight: 800; color: var(--color-danger-light); }
.battle-world { font-size: var(--font-size-sm); color: var(--color-text-muted); }
.battle-progress-dots { display: flex; gap: 5px; flex-wrap: wrap; justify-content: center; }
.battle-dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--color-bg-elevated);
  border: 2px solid var(--color-border);
  transition: all var(--transition-base);
}
.bdot-current { border-color: var(--color-accent); background: rgba(253,203,110,0.2); }
.bdot-correct { background: var(--color-success); border-color: var(--color-success); }
.bdot-wrong { background: var(--color-danger); border-color: var(--color-danger); }

.battle-timer {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: var(--font-size-lg);
  font-weight: 800;
  padding: 6px 14px;
  background: var(--color-bg-elevated);
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
}
.timer-urgent { color: var(--color-danger-light) !important; animation: pulse 0.8s ease infinite; border-color: var(--color-danger) !important; }
.timer-display { direction: ltr; }

.battle-progress-bar { height: 6px; background: var(--color-bg-elevated); }
.battle-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-danger), var(--color-accent));
  transition: width var(--transition-slow);
}

.battle-question-card {
  background: var(--color-bg-card);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 2rem;
  margin: 1.5rem;
  transition: all var(--transition-base);
}
.bq-correct { border-color: var(--color-success); box-shadow: 0 0 30px rgba(0,184,148,0.2); }
.bq-wrong { border-color: var(--color-danger); box-shadow: 0 0 20px rgba(225,112,85,0.15); }

.battle-q-meta { display: flex; justify-content: space-between; align-items: center; margin-bottom: 1rem; }
.battle-q-num { font-size: var(--font-size-sm); color: var(--color-text-muted); font-weight: 600; }
.battle-q-diff { padding: 3px 10px; border-radius: var(--radius-full); font-size: var(--font-size-xs); font-weight: 700; }
.bdiff-easy { background: rgba(0,184,148,0.15); color: var(--color-success); }
.bdiff-medium { background: rgba(253,203,110,0.15); color: var(--color-accent); }
.bdiff-hard { background: rgba(225,112,85,0.15); color: var(--color-danger-light); }

.battle-q-body { margin-bottom: 1.5rem; }
.battle-q-text { font-size: var(--font-size-xl); font-weight: 600; line-height: 1.5; }
.battle-q-math { margin-top: 0.75rem; font-size: 1.3rem; text-align: center; }
.battle-options {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
  margin-bottom: 1rem;
}
.battle-option {
  padding: 14px;
  background: var(--color-bg-elevated);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  color: var(--color-text);
  font-family: var(--font-primary);
  font-size: var(--font-size-lg);
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition-base);
  direction: ltr;
}
.battle-option:hover:not(:disabled) { border-color: var(--color-danger); background: rgba(225,112,85,0.1); transform: translateY(-2px); }
.bo-selected { border-color: var(--color-danger) !important; background: rgba(225,112,85,0.2) !important; }
.bo-correct { border-color: var(--color-success) !important; background: rgba(0,184,148,0.2) !important; color: var(--color-success-light) !important; }
.bo-wrong { border-color: var(--color-danger) !important; background: rgba(225,112,85,0.15) !important; }

.battle-input {
  width: 100%;
  max-width: 200px;
  padding: 14px;
  background: var(--color-bg-elevated);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  color: var(--color-text);
  font-size: var(--font-size-2xl);
  font-weight: 700;
  text-align: center;
  direction: ltr;
}
.battle-input:focus { outline: none; border-color: var(--color-danger); }

.battle-feedback {
  padding: 10px 16px;
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  font-weight: 700;
  margin-bottom: 1rem;
  text-align: center;
}
.bf-correct { background: rgba(0,184,148,0.15); color: var(--color-success-light); }
.bf-wrong { background: rgba(225,112,85,0.12); color: var(--color-danger-light); }
.battle-actions { display: flex; gap: 0.75rem; justify-content: center; flex-wrap: wrap; margin-top: 0.75rem; }

.quiz-results {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - var(--navbar-height) - 3rem);
}
.battle-results-card {
  background: var(--color-bg-card);
  border: 2px solid var(--color-accent);
  border-radius: var(--radius-xl);
  padding: 3rem 2rem;
  text-align: center;
  max-width: 480px;
  width: 100%;
  box-shadow: var(--shadow-glow-accent);
  animation: bounce-in 0.4s ease;
}
.stars-display {
  display: flex;
  justify-content: center;
  gap: 10px;
  font-size: 3.5rem;
  margin-bottom: 1rem;
}
.result-star { color: var(--color-border-strong); transition: all 0.3s ease; }
.result-star.star-earned { color: var(--color-accent); filter: drop-shadow(0 0 12px rgba(253,203,110,0.7)); animation: star-spin 0.6s ease; }
.results-heading { font-size: var(--font-size-2xl); font-weight: 900; margin-bottom: 1rem; }
.battle-score-summary { margin-bottom: 1.5rem; }
.score-big { display: flex; flex-direction: column; align-items: center; gap: 4px; }
.score-num-big { font-size: var(--font-size-4xl); font-weight: 900; color: var(--color-accent); }
.score-label-big { font-size: var(--font-size-sm); color: var(--color-text-muted); }
.xp-breakdown {
  background: var(--color-bg-elevated);
  border-radius: var(--radius-lg);
  padding: 1rem;
  margin-bottom: 1.5rem;
  text-align: right;
}
.xp-breakdown-title { font-size: var(--font-size-base); font-weight: 800; margin-bottom: 0.75rem; }
.xp-line { display: flex; justify-content: space-between; font-size: var(--font-size-sm); padding: 4px 0; color: var(--color-text-muted); }
.xp-total-line { border-top: 1px solid var(--color-border); padding-top: 8px; margin-top: 4px; color: var(--color-accent) !important; font-size: var(--font-size-base) !important; }
.world-unlocked-banner {
  display: flex;
  align-items: center;
  gap: 12px;
  background: rgba(0,184,148,0.1);
  border: 1px solid var(--color-success);
  border-radius: var(--radius-lg);
  padding: 12px 16px;
  margin-bottom: 1rem;
  animation: pulse-glow-success 2s ease infinite;
}
.unlock-icon { font-size: 1.75rem; }
.unlock-title { font-weight: 800; font-size: var(--font-size-base); }
.unlock-world { color: var(--color-success-light); font-size: var(--font-size-sm); }
.battle-time-taken { color: var(--color-text-muted); font-size: var(--font-size-sm); margin-bottom: 1.5rem; }
.results-actions-battle { display: flex; gap: 0.75rem; justify-content: center; flex-wrap: wrap; }

/* ---- Diagnostic Page ---- */
.page-diagnostic { min-height: calc(100vh - var(--navbar-height)); }
.diagnostic-intro {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - var(--navbar-height) - 3rem);
}
.intro-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 3rem 2rem;
  text-align: center;
  max-width: 480px;
  width: 100%;
}
.intro-icon { font-size: 4rem; margin-bottom: 1rem; animation: bounce-in 0.5s ease; }
.intro-title { font-size: var(--font-size-3xl); font-weight: 900; margin-bottom: 6px; }
.intro-subtitle { font-size: var(--font-size-xl); color: var(--color-primary-light); margin-bottom: 1rem; }
.intro-desc { color: var(--color-text-muted); line-height: 1.7; margin-bottom: 1.5rem; }
.intro-details { display: flex; justify-content: center; gap: 0.75rem; flex-wrap: wrap; margin-bottom: 2rem; }
.detail-chip {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--color-bg-elevated);
  border-radius: var(--radius-full);
  padding: 6px 14px;
  font-size: var(--font-size-sm);
  font-weight: 600;
}

.diagnostic-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  background: var(--color-bg-card);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: var(--navbar-height);
  z-index: 10;
  flex-wrap: wrap;
  gap: 0.75rem;
}
.question-counter { font-size: var(--font-size-sm); font-weight: 600; color: var(--color-text-muted); }
.q-current { color: var(--color-primary-light); font-weight: 800; }
.q-total { color: var(--color-text-muted); }

.progress-dots {
  display: flex;
  gap: 5px;
  flex-wrap: wrap;
  justify-content: center;
}
.progress-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-bg-elevated);
  border: 2px solid var(--color-border);
  transition: all var(--transition-base);
}
.dot-current { border-color: var(--color-primary); background: rgba(108,92,231,0.2); }
.dot-correct, .dot-done { background: var(--color-success); border-color: var(--color-success); }
.dot-wrong { background: var(--color-danger); border-color: var(--color-danger); }
.question-timer { font-size: var(--font-size-sm); font-weight: 700; color: var(--color-text-muted); }

.diagnostic-progress-bar { height: 4px; background: var(--color-bg-elevated); }
.diagnostic-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  transition: width var(--transition-slow);
}

.question-card {
  background: var(--color-bg-card);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 2rem;
  margin: 1.5rem;
  transition: all var(--transition-base);
}
.difficulty-badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: 700;
  margin-bottom: 1rem;
}
.diff-easy { background: rgba(0,184,148,0.15); color: var(--color-success); }
.diff-medium { background: rgba(253,203,110,0.15); color: var(--color-accent); }
.diff-hard { background: rgba(225,112,85,0.15); color: var(--color-danger-light); }

.question-body { margin-bottom: 1.5rem; }
.question-text { font-size: var(--font-size-xl); font-weight: 600; line-height: 1.5; }
.question-math { font-size: 1.3rem; margin-top: 0.75rem; text-align: center; }
.answer-options { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0.75rem; margin-bottom: 1.25rem; }
.answer-option {
  padding: 14px;
  background: var(--color-bg-elevated);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  color: var(--color-text);
  font-family: var(--font-primary);
  font-size: var(--font-size-lg);
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition-base);
  direction: ltr;
}
.answer-option:hover:not(.option-disabled) { border-color: var(--color-primary); background: rgba(108,92,231,0.1); }
.option-selected { border-color: var(--color-primary) !important; background: rgba(108,92,231,0.2) !important; }
.option-disabled { cursor: not-allowed; opacity: 0.7; }
.answer-input-wrapper { margin-bottom: 1.25rem; }
.question-actions { display: flex; gap: 0.75rem; align-items: center; flex-wrap: wrap; }
.skip-btn { opacity: 0.7; }

/* Diagnostic Results */
.diagnostic-results {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - var(--navbar-height) - 3rem);
  padding: 1.5rem;
}
.results-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 2.5rem 2rem;
  max-width: 500px;
  width: 100%;
  text-align: center;
}
.results-animation { font-size: 4rem; margin-bottom: 1rem; }
.results-title { font-size: var(--font-size-2xl); font-weight: 900; margin-bottom: 4px; }
.results-subtitle { color: var(--color-text-muted); margin-bottom: 1.5rem; }
.score-summary { display: flex; align-items: center; justify-content: center; gap: 2rem; margin-bottom: 1.5rem; flex-wrap: wrap; }
.score-circle { position: relative; width: 120px; height: 120px; }
.score-svg { width: 120px; height: 120px; transform: rotate(-90deg); }
.score-bg { fill: none; stroke: var(--color-bg-elevated); stroke-width: 10; }
.score-fill { fill: none; stroke: var(--color-primary); stroke-width: 10; stroke-linecap: round; transition: stroke-dashoffset 1.5s ease; }
.score-inner {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
.score-num { font-size: var(--font-size-2xl); font-weight: 900; color: var(--color-accent); }
.score-label { font-size: var(--font-size-xs); color: var(--color-text-muted); }
.score-breakdown { display: flex; flex-direction: column; gap: 8px; }
.breakdown-item { display: flex; align-items: center; gap: 8px; font-size: var(--font-size-sm); }
.breakdown-label { flex: 1; }
.breakdown-value { font-weight: 800; }

.skill-analysis { margin-bottom: 1.5rem; }
.analysis-title { font-size: var(--font-size-base); font-weight: 700; margin-bottom: 0.5rem; }
.skill-chips { display: flex; flex-wrap: wrap; gap: 6px; justify-content: center; margin-bottom: 1rem; }
.skill-chip { padding: 4px 12px; border-radius: var(--radius-full); font-size: var(--font-size-xs); font-weight: 600; }
.strength-chip { background: rgba(0,184,148,0.15); color: var(--color-success); border: 1px solid rgba(0,184,148,0.3); }
.weakness-chip { background: rgba(225,112,85,0.1); color: var(--color-danger-light); border: 1px solid rgba(225,112,85,0.2); }

.recommendation-box {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--color-bg-elevated);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  margin-bottom: 1.5rem;
  border: 1px solid var(--color-primary);
  text-align: right;
}
.recommendation-icon { font-size: 2rem; }
.rec-label { font-size: var(--font-size-xs); color: var(--color-text-muted); margin-bottom: 2px; }
.rec-topic-he { font-size: var(--font-size-lg); font-weight: 800; color: var(--color-primary-light); }
.rec-topic-en { font-size: var(--font-size-sm); color: var(--color-text-muted); direction: ltr; }
.results-actions { display: flex; gap: 0.75rem; justify-content: center; flex-wrap: wrap; }

/* ---- Review Page ---- */
.page-review { min-height: calc(100vh - var(--navbar-height)); }
.review-intro {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - var(--navbar-height) - 3rem);
}
.review-intro-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 3rem 2rem;
  text-align: center;
  max-width: 480px;
  width: 100%;
}
.review-intro-icon { font-size: 4rem; margin-bottom: 1rem; }
.review-intro-title { font-size: var(--font-size-3xl); font-weight: 900; margin-bottom: 4px; }
.review-intro-subtitle { color: var(--color-primary-light); margin-bottom: 1rem; direction: ltr; font-style: italic; }
.review-count-msg { font-size: var(--font-size-xl); font-weight: 700; margin-bottom: 0.75rem; }
.review-count-msg strong { color: var(--color-accent); }
.review-desc { color: var(--color-text-muted); line-height: 1.7; margin-bottom: 1.5rem; }
.review-meta-chips { display: flex; justify-content: center; gap: 0.75rem; flex-wrap: wrap; margin-bottom: 2rem; }
.meta-chip {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--color-bg-elevated);
  border-radius: var(--radius-full);
  padding: 6px 14px;
  font-size: var(--font-size-sm);
  font-weight: 600;
}
.review-done-msg { font-size: var(--font-size-2xl); font-weight: 900; margin-bottom: 8px; }
.review-done-sub { color: var(--color-text-muted); margin-bottom: 2rem; }

.review-header {
  background: var(--color-bg-card);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: var(--navbar-height);
  z-index: 10;
}
.review-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1.5rem;
}
.review-progress-info { font-size: var(--font-size-sm); font-weight: 700; color: var(--color-text-muted); }
.review-score-chip {
  background: rgba(0,184,148,0.15);
  border: 1px solid var(--color-success);
  border-radius: var(--radius-full);
  padding: 4px 12px;
  font-size: var(--font-size-sm);
  font-weight: 700;
  color: var(--color-success);
}
.review-progress-bar { height: 4px; background: var(--color-bg-elevated); }
.review-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-success), var(--color-success-light));
  transition: width var(--transition-slow);
}

.review-card {
  background: var(--color-bg-card);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 2rem;
  margin: 1.5rem;
  min-height: 360px;
  display: flex;
  flex-direction: column;
  transition: border-color var(--transition-base);
}
.rc-correct { border-color: var(--color-success); box-shadow: 0 0 30px rgba(0,184,148,0.2); }
.rc-wrong { border-color: var(--color-danger); }

.review-topic-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(108,92,231,0.12);
  border: 1px solid rgba(108,92,231,0.25);
  border-radius: var(--radius-full);
  padding: 4px 12px;
  font-size: var(--font-size-xs);
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--color-primary-light);
}

.review-problem-content { flex: 1; display: flex; flex-direction: column; }
.review-problem-text { font-size: var(--font-size-xl); font-weight: 600; line-height: 1.5; margin-bottom: 1rem; }
.review-math { font-size: 1.3rem; text-align: center; margin-bottom: 1rem; }
.review-answer-area { margin-bottom: 1.25rem; flex: 1; }
.review-choices { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0.75rem; }
.review-choice {
  padding: 12px;
  background: var(--color-bg-elevated);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  color: var(--color-text);
  font-family: var(--font-primary);
  font-size: var(--font-size-base);
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition-base);
  direction: ltr;
}
.review-choice:hover { border-color: var(--color-success); background: rgba(0,184,148,0.1); }
.rc-selected { border-color: var(--color-success) !important; background: rgba(0,184,148,0.15) !important; }

.review-feedback { flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 1rem; text-align: center; }
.feedback-content { display: flex; flex-direction: column; align-items: center; gap: 8px; }
.feedback-big-icon { font-size: 3.5rem; animation: bounce-in 0.4s ease; }
.feedback-msg { font-size: var(--font-size-lg); font-weight: 700; }
.fb-correct { color: var(--color-success-light); }
.fb-wrong { color: var(--color-danger-light); }
.correct-ans-show { font-size: var(--font-size-sm); color: var(--color-text-muted); }
.ca-label { margin-left: 6px; }
.ca-value { font-weight: 800; color: var(--color-success); direction: ltr; }
.xp-feedback { color: var(--color-accent); font-weight: 800; font-size: var(--font-size-lg); }

.review-complete {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - var(--navbar-height) - 3rem);
  padding: 1.5rem;
}
.complete-card {
  background: var(--color-bg-card);
  border: 2px solid var(--color-success);
  border-radius: var(--radius-xl);
  padding: 3rem 2rem;
  text-align: center;
  max-width: 440px;
  width: 100%;
  box-shadow: var(--shadow-glow-success);
  animation: bounce-in 0.4s ease;
}
.complete-icon { font-size: 4rem; margin-bottom: 1rem; animation: spin-slow 3s ease-in-out infinite; }
.complete-title { font-size: var(--font-size-3xl); font-weight: 900; margin-bottom: 4px; }
.complete-subtitle { color: var(--color-text-muted); margin-bottom: 1.5rem; }
.complete-stats { display: flex; flex-direction: column; gap: 8px; margin-bottom: 1.5rem; }
.cs-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  background: var(--color-bg-elevated);
  border-radius: var(--radius-md);
}
.cs-icon { font-size: 1.2rem; }
.cs-label { flex: 1; font-size: var(--font-size-sm); }
.cs-value { font-weight: 800; color: var(--color-accent); }
.next-review-info {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  margin-bottom: 1.5rem;
}
.nr-icon { font-size: 1.2rem; }
.complete-actions { display: flex; gap: 0.75rem; justify-content: center; flex-wrap: wrap; }

/* ---- Achievement Modal ---- */
.achievement-modal-overlay {
  position: fixed;
  inset: 0;
  z-index: var(--z-modal);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}
.achievement-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.75);
}
.achievement-card-modal {
  background: var(--color-bg-card);
  border: 2px solid var(--color-accent);
  border-radius: var(--radius-xl);
  padding: 3rem 2rem;
  max-width: 400px;
  width: 100%;
  text-align: center;
  position: relative;
  z-index: 1;
  box-shadow: var(--shadow-glow-accent);
}
.achievement-card-enter { animation: bounce-in 0.5s cubic-bezier(0.34,1.56,0.64,1); }

.sparkle-container { position: absolute; inset: 0; pointer-events: none; overflow: hidden; border-radius: var(--radius-xl); }
.sparkle {
  position: absolute;
  color: var(--color-accent);
  font-size: 1.2rem;
  animation: sparkle-anim 1.5s ease-in-out infinite;
}
.sp1 { top: 10%; right: 15%; animation-delay: 0s; }
.sp2 { top: 20%; left: 10%; animation-delay: 0.3s; }
.sp3 { top: 60%; right: 8%; animation-delay: 0.6s; }
.sp4 { bottom: 20%; left: 15%; animation-delay: 0.2s; }
.sp5 { bottom: 10%; right: 25%; animation-delay: 0.8s; }
.sp6 { top: 40%; left: 5%; animation-delay: 0.5s; }

.achievement-badge-display { position: relative; display: inline-block; margin-bottom: 1rem; }
.achievement-badge-glow {
  position: absolute;
  inset: -20px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(253,203,110,0.3) 0%, transparent 70%);
  animation: pulse-glow 2s ease infinite;
}
.achievement-badge-icon { font-size: 5rem; position: relative; z-index: 1; animation: bounce-in 0.6s cubic-bezier(0.34,1.56,0.64,1); }
.achievement-unlock-banner {
  display: inline-block;
  background: linear-gradient(135deg, var(--color-accent), #e0a800);
  color: #1a1a2e;
  border-radius: var(--radius-full);
  padding: 6px 20px;
  font-weight: 800;
  font-size: var(--font-size-sm);
  margin-bottom: 1rem;
}
.achievement-name { font-size: var(--font-size-2xl); font-weight: 900; margin-bottom: 4px; }
.achievement-name-en { color: var(--color-text-muted); font-size: var(--font-size-sm); direction: ltr; margin-bottom: 8px; }
.achievement-description { color: var(--color-text-muted); line-height: 1.6; margin-bottom: 6px; }
.achievement-description-en { color: var(--color-text-dim); font-size: var(--font-size-sm); direction: ltr; margin-bottom: 0.75rem; }
.achievement-xp-reward {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: rgba(253,203,110,0.15);
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-full);
  padding: 5px 14px;
  color: var(--color-accent);
  font-weight: 800;
  margin-bottom: 1.25rem;
}
.achievement-dismiss-btn { min-width: 160px; }

/* ---- Footer ---- */
.site-footer {
  background: var(--color-bg-card);
  border-top: 1px solid var(--color-border);
  margin-top: 3rem;
}
.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1.25rem;
  text-align: center;
}
.footer-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  font-size: var(--font-size-lg);
  font-weight: 800;
  margin-bottom: 6px;
}
.footer-tagline { color: var(--color-text-muted); font-size: var(--font-size-sm); margin-bottom: 1rem; }
.footer-links { display: flex; gap: 1.25rem; justify-content: center; margin-bottom: 1rem; }
.footer-links a { font-size: var(--font-size-sm); color: var(--color-text-muted); }
.footer-copy { font-size: var(--font-size-xs); color: var(--color-text-dim); }

/* ---- Responsive Overrides ---- */
@media (min-width: 640px) {
  .main-content { padding: 2.5rem 2rem; }
  .multiple-choice-grid, .answer-options, .battle-options { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 768px) {
  .main-content { padding: 2.5rem 3rem; }
  .daily-goals-grid { gap: 1.5rem; }
  .worlds-grid { gap: 1.25rem; }
}

@media (min-width: 1024px) {
  .worlds-grid { display: grid; grid-template-columns: repeat(1, 1fr); }
}

@media (max-width: 480px) {
  .welcome-name { font-size: var(--font-size-2xl); }
  .problem-text-he { font-size: var(--font-size-lg); }
  .battle-q-text { font-size: var(--font-size-lg); }
  .boss-title { font-size: var(--font-size-3xl); }
  .modal-card { padding: 1.75rem 1.25rem; }
  .auth-card { padding: 1.75rem 1.25rem; }
  .multiple-choice-grid, .answer-options, .battle-options { grid-template-columns: 1fr; }
}

/* ---- Print ---- */
@media print {
  .navbar, .site-footer, .flash-container, #xp-popup-container { display: none !important; }
  body { background: #fff; color: #000; }
  .main-content { margin-top: 0; }
  .card, .problem-card { box-shadow: none; border: 1px solid #ccc; }
}