/* ===============================================================
   بوابة العلوم - Design System
   نظام ألوان هادئ وتعليمي، RTL كامل، Responsive
   =============================================================== */

@import url('https://fonts.googleapis.com/css2?family=Cairo:wght@300;400;600;700;900&family=Tajawal:wght@300;400;500;700&display=swap');

/* ===============================================================
   CSS Variables – Color Tokens
   =============================================================== */
:root {
  /* Backgrounds */
  --bg-main: #f5f0e8;
  --bg-card: #fffdf7;
  --bg-card-hover: #fff8eb;
  --bg-navbar: #fffdf7;
  --bg-header: #3d2b1f;

  /* Text */
  --text-heading: #3d2b1f;
  --text-body: #4a4a4a;
  --text-muted: #7a7a7a;
  --text-white: #ffffff;
  --text-on-primary: #ffffff;

  /* Brand Colors */
  --primary: #5a7a4a;          /* أخضر زيتوني هادئ */
  --primary-dark: #4a6a3a;
  --primary-light: #7a9a6a;
  --secondary: #b07840;        /* برتقالي ترابي */
  --secondary-light: #d09a60;
  --accent: #8c4a2f;           /* بني أحمر دافئ */

  /* Shadows */
  --shadow-sm: 0 1px 4px rgba(61,43,31,0.08);
  --shadow-md: 0 4px 16px rgba(61,43,31,0.12);
  --shadow-lg: 0 8px 32px rgba(61,43,31,0.16);

  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --radius-full: 100px;

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;

  /* Typography */
  --font-main: 'Cairo', 'Tajawal', sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-md: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.5rem;
  --font-size-5xl: 3.5rem;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;

  /* Font Sizes (user-controlled) */
  --user-scale: 1;
}

/* Font Size Variations */
.font-small  { --user-scale: 0.9; }
.font-medium { --user-scale: 1;   }
.font-large  { --user-scale: 1.15; }

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

html {
  direction: rtl;
  font-size: calc(16px * var(--user-scale));
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-main);
  background-color: var(--bg-main);
  color: var(--text-body);
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.7;
  text-align: right;
}

h1, h2, h3, h4, h5 {
  color: var(--text-heading);
  font-weight: 700;
  line-height: 1.3;
}

a { text-decoration: none; color: inherit; }
button { cursor: pointer; font-family: var(--font-main); border: none; outline: none; }
img { max-width: 100%; }
ul, ol { list-style: none; }

/* ===============================================================
   App Shell / Routing
   =============================================================== */
.page {
  display: none;
  min-height: 100vh;
  animation: pageIn 0.4s ease forwards;
}
.page.active { display: block; }

@keyframes pageIn {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ===============================================================
   TOP NAVBAR
   =============================================================== */
.top-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-navbar);
  box-shadow: var(--shadow-sm);
  padding: var(--space-sm) var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 60px;
}

.top-nav .nav-brand {
  font-size: var(--font-size-xl);
  font-weight: 900;
  color: var(--text-heading);
  letter-spacing: -0.5px;
}

.top-nav .nav-back {
  background: var(--bg-main);
  border: none;
  border-radius: var(--radius-full);
  padding: var(--space-sm) var(--space-md);
  font-size: var(--font-size-sm);
  color: var(--text-heading);
  font-family: var(--font-main);
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition-fast);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}
.top-nav .nav-back:hover { background: var(--bg-card-hover); }

/* ===============================================================
   WELCOME PAGE
   =============================================================== */
#page-welcome {
  background: linear-gradient(160deg, #3d2b1f 0%, #5a4030 40%, #7a5840 70%, #a07060 100%);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  position: relative;
  overflow: hidden;
  text-align: center;
}

#page-welcome::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 50% at 30% 20%, rgba(90,122,74,0.18) 0%, transparent 70%),
    radial-gradient(ellipse 50% 40% at 80% 80%, rgba(176,120,64,0.15) 0%, transparent 70%);
  pointer-events: none;
}

.welcome-content {
  position: relative;
  z-index: 1;
  padding: var(--space-xl);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xl);
  max-width: 600px;
}

.welcome-icon-wrap {
  width: 110px;
  height: 110px;
  background: rgba(255,255,255,0.1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 52px;
  backdrop-filter: blur(10px);
  border: 2px solid rgba(255,255,255,0.15);
  animation: floatIcon 3s ease-in-out infinite;
}

@keyframes floatIcon {
  0%, 100% { transform: translateY(0); }
  50%       { transform: translateY(-10px); }
}

.welcome-title {
  font-size: clamp(2rem, 8vw, 3.5rem);
  font-weight: 900;
  color: var(--text-white);
  text-shadow: 0 2px 16px rgba(0,0,0,0.3);
  line-height: 1.2;
}

.welcome-subtitle {
  font-size: clamp(1rem, 3vw, 1.3rem);
  color: rgba(255,255,255,0.8);
  font-weight: 400;
  max-width: 400px;
}

.welcome-btn {
  background: var(--primary);
  color: var(--text-white);
  font-size: var(--font-size-xl);
  font-weight: 700;
  padding: var(--space-md) var(--space-3xl);
  border-radius: var(--radius-full);
  border: none;
  cursor: pointer;
  transition: all var(--transition-normal);
  box-shadow: 0 4px 20px rgba(90,122,74,0.4);
  font-family: var(--font-main);
  position: relative;
  overflow: hidden;
}

.welcome-btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255,255,255,0);
  transition: background var(--transition-fast);
}
.welcome-btn:hover { transform: translateY(-3px); box-shadow: 0 8px 30px rgba(90,122,74,0.5); }
.welcome-btn:hover::after { background: rgba(255,255,255,0.08); }
.welcome-btn:active { transform: translateY(0); }

.welcome-scroll-indicator {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  color: rgba(255,255,255,0.5);
  font-size: var(--font-size-xs);
  animation: bounceScroll 2s ease-in-out infinite;
}
.welcome-scroll-indicator .arrow-down { font-size: 1.5rem; }

@keyframes bounceScroll {
  0%, 100% { transform: translateX(-50%) translateY(0); opacity: 0.5; }
  50%       { transform: translateX(-50%) translateY(8px); opacity: 1; }
}

@media (max-width: 600px) {
  .welcome-scroll-indicator { display: none; }
}

/* ===============================================================
   HOME PAGE
   =============================================================== */
#page-home { background: var(--bg-main); }

.home-header {
  background: linear-gradient(135deg, var(--bg-header) 0%, #5a4030 100%);
  padding: var(--space-2xl) var(--space-lg);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.home-header::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0; right: 0;
  height: 30px;
  background: var(--bg-main);
  clip-path: ellipse(55% 100% at 50% 100%);
}

.home-header-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-lg);
}

.home-app-title {
  font-size: var(--font-size-2xl);
  font-weight: 900;
  color: var(--text-white);
}

.home-settings-btn {
  background: rgba(255,255,255,0.15);
  border: none;
  border-radius: var(--radius-full);
  width: 44px; height: 44px;
  font-size: 1.3rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition-fast);
}
.home-settings-btn:hover { background: rgba(255,255,255,0.25); }

.home-welcome-text {
  color: rgba(255,255,255,0.85);
  font-size: var(--font-size-lg);
  font-weight: 400;
}

.home-progress-mini {
  margin-top: var(--space-md);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
}

.progress-bar-wrap {
  width: 200px;
  height: 8px;
  background: rgba(255,255,255,0.2);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: var(--primary-light);
  border-radius: var(--radius-full);
  transition: width 0.8s ease;
}

.progress-label {
  font-size: var(--font-size-sm);
  color: rgba(255,255,255,0.7);
}

/* Cards Grid */
.cards-section {
  padding: var(--space-xl) var(--space-lg);
  max-width: 900px;
  margin: 0 auto;
}

.section-title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--text-heading);
  margin-bottom: var(--space-lg);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.section-title::after {
  content: '';
  flex: 1;
  height: 2px;
  background: linear-gradient(90deg, var(--primary), transparent);
  border-radius: var(--radius-full);
  margin-right: var(--space-sm);
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--space-md);
}

.main-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  transition: all var(--transition-normal);
  border: 1px solid rgba(61,43,31,0.06);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  position: relative;
  overflow: hidden;
}

.main-card::before {
  content: '';
  position: absolute;
  top: 0; right: 0;
  width: 60px; height: 60px;
  background: var(--card-color, var(--primary));
  opacity: 0.07;
  border-radius: 0 var(--radius-lg) 0 60px;
  transition: all var(--transition-normal);
}

.main-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  background: var(--bg-card-hover);
}
.main-card:hover::before { opacity: 0.12; width: 80px; height: 80px; }
.main-card:active { transform: translateY(-1px); }

.card-icon {
  font-size: 2.5rem;
  line-height: 1;
}

.card-title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--text-heading);
}

.card-desc {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  line-height: 1.6;
}

.card-btn {
  margin-top: auto;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: 600;
  font-family: var(--font-main);
  background: var(--card-color, var(--primary));
  color: white;
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  width: fit-content;
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
}
.card-btn:hover { opacity: 0.9; transform: translateX(-2px); }

/* About card link */
.about-link {
  text-align: center;
  padding: var(--space-md);
  color: var(--text-muted);
  font-size: var(--font-size-sm);
  cursor: pointer;
  transition: color var(--transition-fast);
}
.about-link:hover { color: var(--primary); }

/* ===============================================================
   PAGE HEADER (shared component)
   =============================================================== */
.page-header {
  background: linear-gradient(135deg, var(--text-heading) 0%, #5a4030 100%);
  padding: var(--space-xl) var(--space-lg);
  color: white;
  position: sticky;
  top: 0;
  z-index: 50;
}

.page-header-inner {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  max-width: 900px;
  margin: 0 auto;
}

.btn-back {
  background: rgba(255,255,255,0.15);
  color: white;
  border: none;
  border-radius: var(--radius-full);
  padding: var(--space-sm) var(--space-md);
  font-size: var(--font-size-sm);
  font-family: var(--font-main);
  cursor: pointer;
  transition: background var(--transition-fast);
  white-space: nowrap;
}
.btn-back:hover { background: rgba(255,255,255,0.25); }

.page-header h1 {
  color: white;
  font-size: var(--font-size-2xl);
  font-weight: 900;
}

/* ===============================================================
   PAGE CONTENT WRAP
   =============================================================== */
.page-content {
  max-width: 900px;
  margin: 0 auto;
  padding: var(--space-xl) var(--space-lg);
}

/* ===============================================================
   LESSONS PAGE
   =============================================================== */
.units-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.unit-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  border: 1px solid rgba(61,43,31,0.06);
}

.unit-header {
  padding: var(--space-lg) var(--space-xl);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: background var(--transition-fast);
  gap: var(--space-md);
}
.unit-header:hover { background: var(--bg-card-hover); }

.unit-header-left {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.unit-icon {
  font-size: 2rem;
  width: 52px; height: 52px;
  background: var(--bg-main);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.unit-meta h3 {
  font-size: var(--font-size-lg);
  color: var(--text-heading);
}
.unit-meta p {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  margin-top: 2px;
}

.unit-toggle {
  font-size: 1.2rem;
  color: var(--text-muted);
  transition: transform var(--transition-normal);
  flex-shrink: 0;
}
.unit-card.open .unit-toggle { transform: rotate(180deg); }

.unit-lessons {
  display: none;
  border-top: 1px solid var(--bg-main);
}
.unit-card.open .unit-lessons { display: block; }

.lesson-item {
  padding: var(--space-md) var(--space-xl);
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  transition: background var(--transition-fast);
  border-bottom: 1px solid var(--bg-main);
  gap: var(--space-md);
}
.lesson-item:last-child { border-bottom: none; }
.lesson-item:hover { background: var(--bg-card-hover); }

.lesson-item-left {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.lesson-num {
  width: 36px; height: 36px;
  background: var(--primary);
  color: white;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-sm);
  font-weight: 700;
  flex-shrink: 0;
}

.lesson-info h4 {
  font-size: var(--font-size-md);
  color: var(--text-heading);
  font-weight: 600;
}
.lesson-info p {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
}

.lesson-status {
  font-size: 1rem;
  color: var(--text-muted);
}
.lesson-status.done { color: var(--primary); }

/* ===============================================================
   LESSON DETAIL VIEW
   =============================================================== */
#lesson-detail-view .lesson-detail-header {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  padding: var(--space-xl) var(--space-lg);
  color: white;
}

.lesson-objective {
  background: var(--bg-main);
  border-right: 4px solid var(--primary);
  border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-lg);
  font-size: var(--font-size-md);
  color: var(--text-body);
  margin-bottom: var(--space-lg);
}

.lesson-content-block {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  box-shadow: var(--shadow-sm);
  margin-bottom: var(--space-md);
}

.lesson-content-block h3 {
  font-size: var(--font-size-lg);
  color: var(--primary-dark);
  margin-bottom: var(--space-md);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.content-paragraph {
  background: var(--bg-main);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  margin-bottom: var(--space-sm);
  font-size: var(--font-size-md);
  line-height: 1.8;
}

.example-box {
  background: linear-gradient(135deg, rgba(90,122,74,0.08), rgba(90,122,74,0.04));
  border: 1px solid rgba(90,122,74,0.2);
  border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-lg);
}

.diagram-box {
  background: linear-gradient(135deg, rgba(176,120,64,0.08), rgba(176,120,64,0.03));
  border: 1px solid rgba(176,120,64,0.2);
  border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-lg);
  font-family: monospace;
  font-size: 1.1rem;
  text-align: center;
  letter-spacing: 1px;
  direction: rtl;
}

.check-question-block {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(61,43,31,0.06);
}

/* ===============================================================
   MCQ / EXERCISES
   =============================================================== */
.mcq-options {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  margin-top: var(--space-md);
}

.mcq-option {
  background: var(--bg-main);
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-lg);
  cursor: pointer;
  font-size: var(--font-size-md);
  font-family: var(--font-main);
  color: var(--text-body);
  text-align: right;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.mcq-option:hover { border-color: var(--primary); background: rgba(90,122,74,0.05); }
.mcq-option.selected { border-color: var(--primary); background: rgba(90,122,74,0.1); }
.mcq-option.correct { border-color: #4caf50; background: rgba(76,175,80,0.1); color: #2e7d32; }
.mcq-option.wrong   { border-color: #ef5350; background: rgba(239,83,80,0.1); color: #c62828; }

.option-label {
  width: 28px; height: 28px;
  border-radius: 50%;
  background: white;
  border: 1.5px solid rgba(61,43,31,0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-xs);
  font-weight: 700;
  flex-shrink: 0;
  color: var(--text-muted);
}

.true-false-btns {
  display: flex;
  gap: var(--space-md);
  margin-top: var(--space-md);
}

.tf-btn {
  flex: 1;
  padding: var(--space-md);
  border-radius: var(--radius-md);
  font-size: var(--font-size-lg);
  font-family: var(--font-main);
  font-weight: 700;
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
}
.tf-btn.true-btn  { background: rgba(76,175,80,0.1); color: #2e7d32; border-color: #a5d6a7; }
.tf-btn.false-btn { background: rgba(239,83,80,0.1); color: #c62828; border-color: #ef9a9a; }
.tf-btn:hover { transform: translateY(-2px); box-shadow: var(--shadow-sm); }
.tf-btn.correct { background: #4caf50; color: white; border-color: #4caf50; }
.tf-btn.wrong   { background: #ef5350; color: white; border-color: #ef5350; }

.feedback-box {
  margin-top: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  display: none;
  animation: feedbackIn 0.3s ease;
}
.feedback-box.show { display: block; }
.feedback-box.correct-fb { background: rgba(76,175,80,0.1); color: #2e7d32; border: 1px solid #c8e6c9; }
.feedback-box.wrong-fb   { background: rgba(239,83,80,0.1); color: #c62828; border: 1px solid #ffcdd2; }

@keyframes feedbackIn {
  from { opacity: 0; transform: translateY(-8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.btn-primary {
  background: var(--primary);
  color: white;
  border: none;
  border-radius: var(--radius-full);
  padding: var(--space-md) var(--space-xl);
  font-size: var(--font-size-md);
  font-family: var(--font-main);
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition-normal);
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
}
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn-primary:active { transform: translateY(0); }

.btn-secondary {
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
  border-radius: var(--radius-full);
  padding: var(--space-sm) var(--space-lg);
  font-size: var(--font-size-md);
  font-family: var(--font-main);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}
.btn-secondary:hover { background: rgba(90,122,74,0.08); }

/* ===============================================================
   LABS PAGE
   =============================================================== */
.lab-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  box-shadow: var(--shadow-sm);
  margin-bottom: var(--space-md);
  border: 1px solid rgba(61,43,31,0.06);
  cursor: pointer;
  transition: all var(--transition-normal);
}
.lab-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }

.lab-card-header {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-sm);
}

.lab-icon {
  width: 52px; height: 52px;
  background: linear-gradient(135deg, rgba(176,120,64,0.15), rgba(176,120,64,0.05));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
}

.lab-steps {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.lab-step {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  padding: var(--space-sm) 0;
}

.step-num {
  width: 28px; height: 28px;
  background: var(--secondary);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-sm);
  font-weight: 700;
  flex-shrink: 0;
}

/* ===============================================================
   EXERCISES PAGE
   =============================================================== */
.exercise-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  box-shadow: var(--shadow-sm);
  margin-bottom: var(--space-lg);
  border: 1px solid rgba(61,43,31,0.06);
}

.exercise-counter {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  margin-bottom: var(--space-sm);
}

.exercise-question {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--text-heading);
  margin-bottom: var(--space-md);
  line-height: 1.6;
}

.score-display {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  text-align: center;
  box-shadow: var(--shadow-md);
  margin-bottom: var(--space-lg);
}

.score-circle {
  width: 120px; height: 120px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-lg);
  box-shadow: 0 4px 20px rgba(90,122,74,0.3);
}

.score-num { font-size: 2.5rem; font-weight: 900; color: white; line-height: 1; }
.score-denom { font-size: var(--font-size-sm); color: rgba(255,255,255,0.8); }

/* ===============================================================
   GAMES PAGE
   =============================================================== */
.games-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: var(--space-md);
}

.game-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  transition: all var(--transition-normal);
  border: 1px solid rgba(61,43,31,0.06);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
}
.game-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }

.game-icon {
  font-size: 3.5rem;
  line-height: 1;
  filter: drop-shadow(0 2px 8px rgba(0,0,0,0.1));
}

/* Speed quiz game */
.speed-quiz {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  box-shadow: var(--shadow-md);
}

.timer-circle {
  width: 80px; height: 80px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--secondary), var(--secondary-light));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  font-weight: 900;
  color: white;
  margin: 0 auto var(--space-md);
  box-shadow: 0 4px 16px rgba(176,120,64,0.3);
  transition: background 0.5s;
}

.timer-circle.urgent {
  background: linear-gradient(135deg, #ef5350, #c62828);
  animation: pulse 0.5s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50%       { transform: scale(1.05); }
}

/* Matching game */
.matching-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-sm);
}

.match-item {
  background: var(--bg-main);
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  padding: var(--space-md);
  cursor: pointer;
  text-align: center;
  font-size: var(--font-size-sm);
  transition: all var(--transition-fast);
  font-family: var(--font-main);
  font-weight: 600;
}
.match-item:hover { border-color: var(--primary); }
.match-item.selected { border-color: var(--secondary); background: rgba(176,120,64,0.1); }
.match-item.matched  { border-color: var(--primary); background: rgba(90,122,74,0.1); color: var(--primary-dark); pointer-events: none; }
.match-item.wrong    { border-color: #ef5350; background: rgba(239,83,80,0.1); animation: shake 0.4s; }

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25%       { transform: translateX(-6px); }
  75%       { transform: translateX(6px); }
}

/* Ordering game */
.order-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.order-item {
  background: var(--bg-main);
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-lg);
  cursor: grab;
  display: flex;
  align-items: center;
  gap: var(--space-md);
  font-family: var(--font-main);
  font-weight: 600;
  transition: all var(--transition-fast);
  user-select: none;
}
.order-item:hover { border-color: rgba(90,122,74,0.3); background: rgba(90,122,74,0.05); }
.order-item.dragging { opacity: 0.5; }
.order-item .drag-handle { color: var(--text-muted); font-size: 1.2rem; }

/* ===============================================================
   PROGRESS PAGE
   =============================================================== */
.progress-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
}

.stat-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  text-align: center;
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(61,43,31,0.06);
}

.stat-value {
  font-size: var(--font-size-3xl);
  font-weight: 900;
  color: var(--primary);
  line-height: 1;
  margin-bottom: var(--space-xs);
}

.stat-label {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
}

/* Units Progress */
.units-progress-list { display: flex; flex-direction: column; gap: var(--space-md); }

.unit-progress-item {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  box-shadow: var(--shadow-sm);
}

.unit-progress-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-sm);
}

.unit-progress-bar {
  height: 8px;
  background: var(--bg-main);
  border-radius: var(--radius-full);
  overflow: hidden;
}
.unit-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--primary-light));
  border-radius: var(--radius-full);
  transition: width 1s ease;
}

/* Badges */
.badges-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: var(--space-md);
}

.badge-item {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: var(--space-lg) var(--space-md);
  text-align: center;
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(61,43,31,0.06);
  transition: all var(--transition-normal);
}
.badge-item.unlocked { border-color: var(--primary); }
.badge-item.locked   { opacity: 0.45; filter: grayscale(100%); }
.badge-item:hover    { transform: translateY(-2px); }

.badge-emoji { font-size: 2.5rem; margin-bottom: var(--space-sm); }
.badge-title { font-size: var(--font-size-xs); font-weight: 700; color: var(--text-heading); }

/* ===============================================================
   SETTINGS PAGE
   =============================================================== */
.settings-section {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  margin-bottom: var(--space-lg);
  border: 1px solid rgba(61,43,31,0.06);
}

.settings-section-title {
  padding: var(--space-md) var(--space-xl);
  background: var(--bg-main);
  font-size: var(--font-size-sm);
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.setting-item {
  padding: var(--space-lg) var(--space-xl);
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--bg-main);
  gap: var(--space-md);
}
.setting-item:last-child { border-bottom: none; }

.setting-info .setting-label {
  font-size: var(--font-size-md);
  font-weight: 600;
  color: var(--text-heading);
}
.setting-info .setting-desc {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  margin-top: 2px;
}

/* Toggle Switch */
.toggle-switch {
  position: relative;
  width: 52px; height: 28px;
  flex-shrink: 0;
}
.toggle-switch input { opacity: 0; width: 0; height: 0; position: absolute; }
.toggle-slider {
  position: absolute;
  inset: 0;
  background: #ccc;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: background var(--transition-normal);
}
.toggle-slider::before {
  content: '';
  position: absolute;
  width: 20px; height: 20px;
  right: 4px; top: 4px;
  background: white;
  border-radius: 50%;
  transition: transform var(--transition-normal);
  box-shadow: var(--shadow-sm);
}
.toggle-switch input:checked + .toggle-slider { background: var(--primary); }
.toggle-switch input:checked + .toggle-slider::before { transform: translateX(-24px); }

/* Font Size Selector */
.font-size-selector {
  display: flex;
  gap: var(--space-sm);
}
.font-size-btn {
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--radius-full);
  border: 2px solid var(--bg-main);
  background: var(--bg-main);
  cursor: pointer;
  font-family: var(--font-main);
  font-weight: 600;
  color: var(--text-muted);
  transition: all var(--transition-fast);
}
.font-size-btn.active { border-color: var(--primary); color: var(--primary); background: rgba(90,122,74,0.08); }

/* ===============================================================
   ABOUT PAGE
   =============================================================== */
.about-hero {
  text-align: center;
  padding: var(--space-3xl) var(--space-lg);
  background: linear-gradient(135deg, var(--text-heading) 0%, #5a4030 100%);
  color: white;
}

.about-logo {
  font-size: 4rem;
  margin-bottom: var(--space-md);
}

.about-sections {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.about-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(61,43,31,0.06);
}

.about-card h3 {
  font-size: var(--font-size-lg);
  color: var(--primary-dark);
  margin-bottom: var(--space-md);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

/* ===============================================================
   UTILITY CLASSES
   =============================================================== */
.text-center { text-align: center; }
.text-muted  { color: var(--text-muted); }
.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.hidden { display: none !important; }
.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.gap-sm { gap: var(--space-sm); }

/* Tag / Chip */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px var(--space-sm);
  background: rgba(90,122,74,0.1);
  color: var(--primary-dark);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: 700;
}

/* Divider */
.divider {
  height: 1px;
  background: var(--bg-main);
  margin: var(--space-lg) 0;
}

/* Info bar */
.info-bar {
  background: rgba(176,120,64,0.08);
  border: 1px solid rgba(176,120,64,0.2);
  border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-lg);
  font-size: var(--font-size-sm);
  color: var(--secondary);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

/* ===============================================================
   RESPONSIVE
   =============================================================== */
@media (max-width: 640px) {
  :root { --space-lg: 16px; --space-xl: 20px; }

  .cards-grid { grid-template-columns: 1fr 1fr; }
  .progress-stats { grid-template-columns: 1fr 1fr; }
  .games-grid { grid-template-columns: 1fr 1fr; }
  .badges-grid { grid-template-columns: repeat(3, 1fr); }
  .matching-grid { grid-template-columns: 1fr 1fr; }
  .font-size-selector { flex-wrap: wrap; }

  .home-header { padding: var(--space-xl) var(--space-lg) var(--space-3xl); }
  .page-header h1 { font-size: var(--font-size-xl); }

  .main-card { padding: var(--space-lg); }
}

@media (max-width: 360px) {
  .cards-grid { grid-template-columns: 1fr; }
}

/* ===============================================================
   SCROLLBAR (Webkit)
   =============================================================== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-main); }
::-webkit-scrollbar-thumb { background: rgba(61,43,31,0.2); border-radius: 10px; }
::-webkit-scrollbar-thumb:hover { background: rgba(61,43,31,0.35); }

/* ===============================================================
   LOADING
   =============================================================== */
.loading-overlay {
  position: fixed;
  inset: 0;
  background: var(--bg-main);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: var(--space-lg);
  z-index: 9999;
  transition: opacity 0.5s, visibility 0.5s;
}
.loading-overlay.hidden { opacity: 0; visibility: hidden; }

.loader-spinner {
  width: 52px; height: 52px;
  border: 4px solid rgba(90,122,74,0.2);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }