/* ============================================
   موقع الأحياء التفاعلي - أحياء 2 (السنة الثانوية)
   فصل: تركيب الخلية ووظائفها + كيمياء الخلية
   ============================================ */

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

:root {
  --primary: #0f6b4f;
  --primary-dark: #094a36;
  --primary-light: #e3f4ec;
  --accent: #d97706;
  --accent-light: #fdf1e0;
  --blue: #1e4e8c;
  --blue-light: #e8f0fb;
  --purple: #6d28d9;
  --purple-light: #f1eafd;
  --danger: #b91c1c;
  --danger-light: #fdeaea;
  --text: #1f2937;
  --text-muted: #6b7280;
  --bg: #f8faf9;
  --card: #ffffff;
  --border: #e5e7eb;
  --radius: 16px;
  --shadow: 0 4px 20px rgba(15, 107, 79, 0.08);
  --shadow-lg: 0 10px 40px rgba(15, 107, 79, 0.15);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: 'Cairo', 'Tajawal', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.9;
  direction: rtl;
  font-size: 17px;
}

/* ============ شريط التنقل ============ */
.navbar {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  color: #fff;
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 15px rgba(0,0,0,0.2);
}

.navbar-container {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  flex-wrap: wrap;
}

.navbar .logo {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 0;
  font-weight: 900;
  font-size: 1.15rem;
  text-decoration: none;
  color: #fff;
}

.navbar .logo .cell-icon {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, #6ee7b7, #10b981 60%, #047857);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  box-shadow: inset 0 0 0 3px rgba(255,255,255,0.35);
}

.navbar nav {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}

.navbar nav a {
  color: rgba(255,255,255,0.9);
  text-decoration: none;
  padding: 10px 14px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.98rem;
  transition: all 0.2s;
}

.navbar nav a:hover,
.navbar nav a.active {
  background: rgba(255,255,255,0.18);
  color: #fff;
}

/* ============ الهيرو ============ */
.hero {
  background:
    radial-gradient(circle at 85% 15%, rgba(217, 119, 6, 0.25), transparent 45%),
    radial-gradient(circle at 10% 85%, rgba(110, 231, 183, 0.3), transparent 40%),
    linear-gradient(135deg, #064e3b, #0f6b4f 55%, #047857);
  color: #fff;
  padding: 72px 20px 64px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "🧬";
  position: absolute;
  font-size: 14rem;
  opacity: 0.07;
  top: 20px;
  left: 30px;
  transform: rotate(-15deg);
}

.hero h1 {
  font-size: clamp(1.9rem, 5vw, 3.2rem);
  font-weight: 900;
  margin-bottom: 16px;
  position: relative;
}

.hero .subtitle {
  font-size: clamp(1.05rem, 2.5vw, 1.35rem);
  opacity: 0.94;
  max-width: 760px;
  margin: 0 auto 10px;
  position: relative;
}

.hero .badge-row {
  margin-top: 22px;
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
  position: relative;
}

.hero .badge {
  background: rgba(255,255,255,0.14);
  border: 1px solid rgba(255,255,255,0.35);
  padding: 6px 16px;
  border-radius: 999px;
  font-size: 0.95rem;
  font-weight: 600;
  backdrop-filter: blur(4px);
}

/* ============ الحاوية العامة ============ */
.container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 40px 20px;
}

.section-title {
  text-align: center;
  margin-bottom: 36px;
}

.section-title h2 {
  font-size: clamp(1.6rem, 4vw, 2.3rem);
  color: var(--primary-dark);
  font-weight: 900;
  margin-bottom: 8px;
}

.section-title p {
  color: var(--text-muted);
  max-width: 640px;
  margin: 0 auto;
}

/* ============ البطاقات ============ */
.grid {
  display: grid;
  gap: 22px;
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 26px;
  border: 1px solid var(--border);
  transition: transform 0.25s, box-shadow 0.25s;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.card.link-card {
  text-decoration: none;
  color: inherit;
  display: block;
  position: relative;
  overflow: hidden;
}

.card .card-icon {
  width: 58px;
  height: 58px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.7rem;
  margin-bottom: 14px;
}

.icon-green { background: var(--primary-light); }
.icon-orange { background: var(--accent-light); }
.icon-blue { background: var(--blue-light); }
.icon-purple { background: var(--purple-light); }

.card h3 {
  font-size: 1.25rem;
  color: var(--primary-dark);
  margin-bottom: 8px;
}

.card p { color: var(--text-muted); font-size: 0.98rem; }

.card .card-link-hint {
  margin-top: 12px;
  font-weight: 700;
  color: var(--primary);
  font-size: 0.95rem;
}

/* ============ أقسام المحتوى التعليمي ============ */
.lesson {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 34px;
  margin-bottom: 30px;
  border-top: 5px solid var(--primary);
}

.lesson.orange-top { border-top-color: var(--accent); }
.lesson.blue-top { border-top-color: var(--blue); }
.lesson.purple-top { border-top-color: var(--purple); }

.lesson h2 {
  color: var(--primary-dark);
  font-size: 1.75rem;
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.lesson .lesson-sub {
  color: var(--text-muted);
  margin-bottom: 20px;
  font-size: 1rem;
}

.lesson h3 {
  color: var(--primary);
  font-size: 1.3rem;
  margin: 26px 0 10px;
  padding-right: 14px;
  border-right: 5px solid var(--accent);
}

.lesson h4 {
  color: var(--blue);
  font-size: 1.08rem;
  margin: 18px 0 8px;
}

.lesson p { margin-bottom: 12px; }

.lesson ul, .lesson ol {
  margin: 10px 28px 16px 0;
}

.lesson li { margin-bottom: 8px; }

.lesson strong { color: var(--primary-dark); }

/* فقرة "ببساطة" */
.simple-box {
  background: linear-gradient(135deg, #fff7ed, #ffedd5);
  border: 2px dashed #fb923c;
  border-radius: 14px;
  padding: 18px 22px;
  margin: 18px 0;
}

.simple-box .simple-tag {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  padding: 3px 14px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.85rem;
  margin-bottom: 8px;
}

.simple-box p { margin: 0; color: #7c2d12; }

/* صناديق التنبيه */
.alert-box {
  border-radius: 12px;
  padding: 16px 20px;
  margin: 16px 0;
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

.alert-box .alert-icon { font-size: 1.4rem; flex-shrink: 0; }

.alert-info { background: var(--blue-light); border-right: 5px solid var(--blue); }
.alert-warn { background: var(--accent-light); border-right: 5px solid var(--accent); }
.alert-danger { background: var(--danger-light); border-right: 5px solid var(--danger); }
.alert-success { background: var(--primary-light); border-right: 5px solid var(--primary); }

.alert-box p { margin: 0; }

/* ============ جدول الكلمات المفتاحية ============ */
.keywords-table {
  width: 100%;
  border-collapse: collapse;
  margin: 18px 0;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow);
  background: #fff;
}

.keywords-table thead {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  color: #fff;
}

.keywords-table th {
  padding: 13px 16px;
  text-align: right;
  font-weight: 700;
  font-size: 1rem;
}

.keywords-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

.keywords-table tbody tr:nth-child(even) { background: #f6faf8; }
.keywords-table tbody tr:hover { background: var(--primary-light); }

.keywords-table .kw {
  font-weight: 700;
  color: var(--primary-dark);
  white-space: nowrap;
}

.keywords-table .en {
  display: block;
  color: var(--text-muted);
  font-size: 0.85rem;
  font-weight: 400;
  direction: ltr;
  text-align: right;
}

/* ============ جدول مقارنة ============ */
.compare-table {
  width: 100%;
  border-collapse: collapse;
  margin: 18px 0;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow);
}

.compare-table th {
  background: var(--blue);
  color: #fff;
  padding: 12px 16px;
  text-align: right;
}

.compare-table td {
  padding: 12px 16px;
  border: 1px solid var(--border);
  background: #fff;
  vertical-align: top;
}

.compare-table tbody tr:nth-child(even) td { background: #f6f9fd; }

/* ============ أزرار ============ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 26px;
  border-radius: 12px;
  font-weight: 700;
  font-size: 1rem;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: all 0.2s;
  font-family: inherit;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  box-shadow: 0 4px 14px rgba(15,107,79,0.35);
}

.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 7px 20px rgba(15,107,79,0.45); }

.btn-accent {
  background: linear-gradient(135deg, #f59e0b, #d97706);
  color: #fff;
  box-shadow: 0 4px 14px rgba(217,119,6,0.35);
}

.btn-accent:hover { transform: translateY(-2px); box-shadow: 0 7px 20px rgba(217,119,6,0.45); }

.btn-outline {
  background: #fff;
  color: var(--primary-dark);
  border: 2px solid var(--primary);
}

.btn-outline:hover { background: var(--primary-light); }

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none !important;
}

/* ============ شريط التقدم ============ */
.progress-bar {
  background: var(--border);
  border-radius: 999px;
  height: 10px;
  overflow: hidden;
  margin: 8px 0;
}

.progress-bar .fill {
  height: 100%;
  background: linear-gradient(90deg, #34d399, #0f6b4f);
  border-radius: 999px;
  transition: width 0.5s ease;
  width: 0%;
}

/* ============ بنك الأسئلة ============ */
.quiz-header {
  text-align: center;
  margin-bottom: 26px;
}

.quiz-options {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 24px;
}

.quiz-options label {
  background: #fff;
  border: 2px solid var(--border);
  border-radius: 12px;
  padding: 10px 18px;
  cursor: pointer;
  font-weight: 600;
  transition: all 0.2s;
}

.quiz-options label:hover { border-color: var(--primary); }
.quiz-options input[type="radio"] { margin-left: 6px; accent-color: var(--primary); }

.question-card {
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 26px;
  margin-bottom: 22px;
  border: 1px solid var(--border);
}

.question-card .q-number {
  display: inline-block;
  background: var(--primary);
  color: #fff;
  border-radius: 10px;
  padding: 2px 12px;
  font-weight: 700;
  font-size: 0.9rem;
  margin-bottom: 10px;
}

.question-card .q-difficulty {
  display: inline-block;
  border-radius: 10px;
  padding: 2px 12px;
  font-weight: 700;
  font-size: 0.85rem;
  margin-bottom: 10px;
  margin-right: 8px;
}

.diff-easy { background: #d1fae5; color: #065f46; }
.diff-medium { background: #fef3c7; color: #92400e; }
.diff-hard { background: #fee2e2; color: #991b1b; }

.question-card .q-text {
  font-size: 1.08rem;
  font-weight: 600;
  margin-bottom: 14px;
}

.choices { display: grid; gap: 10px; }

.choice {
  display: flex;
  align-items: center;
  gap: 10px;
  background: #f9fafb;
  border: 2px solid var(--border);
  border-radius: 12px;
  padding: 12px 16px;
  cursor: pointer;
  transition: all 0.2s;
  font-size: 1rem;
}

.choice:hover { border-color: var(--primary); background: #fff; }

.choice input[type="radio"] {
  accent-color: var(--primary);
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.choice.correct {
  background: #d1fae5;
  border-color: #059669;
  font-weight: 700;
}

.choice.wrong {
  background: #fee2e2;
  border-color: #dc2626;
}

.q-feedback {
  display: none;
  margin-top: 14px;
  padding: 14px 18px;
  border-radius: 12px;
  font-size: 0.98rem;
}

.q-feedback.show { display: block; }
.q-feedback.correct { background: #d1fae5; border-right: 5px solid #059669; }
.qfeedback.wrong, .q-feedback.wrong { background: #fee2e2; border-right: 5px solid #dc2626; }

.q-feedback .explain-title { font-weight: 800; margin-bottom: 4px; }

.quiz-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  flex-wrap: wrap;
  position: sticky;
  bottom: 0;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(8px);
  padding: 14px 18px;
  border-radius: 14px;
  box-shadow: 0 -4px 20px rgba(0,0,0,0.1);
  margin-top: 10px;
}

.quiz-score {
  font-weight: 800;
  color: var(--primary-dark);
  font-size: 1.05rem;
}

/* ============ البطاقات التعليمية (Flip) ============ */
.flip-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
  gap: 16px;
  margin: 20px 0;
}

.flip-card {
  perspective: 800px;
  height: 150px;
  cursor: pointer;
}

.flip-card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 0.6s;
  transform-style: preserve-3d;
}

.flip-card.flipped .flip-card-inner { transform: rotateY(180deg); }

.flip-card-front,
.flip-card-back {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  border-radius: 14px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 14px;
}

.flip-card-front {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  font-weight: 800;
  font-size: 1.05rem;
  gap: 6px;
}

.flip-card-front .emoji { font-size: 1.8rem; }

.flip-card-back {
  background: #fff;
  border: 2px solid var(--primary);
  color: var(--text);
  font-size: 0.93rem;
  transform: rotateY(180deg);
}

/* ============ صفحة الألعاب ثلاثية الأبعاد ============ */
.game-shell {
  background: #0a0f1e;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  margin-bottom: 24px;
}

.game-shell canvas {
  display: block;
  width: 100% !important;
  height: 520px !important;
  cursor: grab;
}

.game-shell canvas:active { cursor: grabbing; }

.game-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  padding: 14px 18px;
  background: rgba(255,255,255,0.06);
  color: #fff;
  border-top: 1px solid rgba(255,255,255,0.12);
}

.game-toolbar .hint { font-size: 0.9rem; color: #cbd5e1; }

.game-btn {
  background: rgba(255,255,255,0.12);
  color: #fff;
  border: 1px solid rgba(255,255,255,0.3);
  padding: 8px 16px;
  border-radius: 10px;
  cursor: pointer;
  font-family: inherit;
  font-weight: 600;
  font-size: 0.95rem;
  transition: background 0.2s;
}

.game-btn:hover { background: rgba(255,255,255,0.25); }

.organelle-label {
  position: absolute;
  pointer-events: none;
  background: rgba(15, 107, 79, 0.95);
  color: #fff;
  padding: 6px 14px;
  border-radius: 10px;
  font-size: 0.95rem;
  font-weight: 700;
  transform: translate(-50%, -130%);
  white-space: nowrap;
  display: none;
  box-shadow: 0 4px 14px rgba(0,0,0,0.4);
  z-index: 20;
}

.organelle-label.show { display: block; }

.organelle-label .sub {
  display: block;
  font-weight: 400;
  font-size: 0.8rem;
  opacity: 0.85;
}

/* لوحة معلومات الخلية */
.info-panel {
  position: absolute;
  top: 16px;
  right: 16px;
  background: rgba(255,255,255,0.95);
  border-radius: 14px;
  padding: 16px 20px;
  max-width: 300px;
  box-shadow: 0 6px 24px rgba(0,0,0,0.35);
  z-index: 15;
  display: none;
}

.info-panel.show { display: block; }

.info-panel h4 {
  color: var(--primary-dark);
  font-size: 1.05rem;
  margin-bottom: 6px;
}

.info-panel p { font-size: 0.9rem; margin: 0; color: var(--text); }

/* ============ الفلاتر ============ */
.filter-bar {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 24px;
}

.filter-btn {
  background: #fff;
  border: 2px solid var(--border);
  color: var(--text);
  padding: 8px 18px;
  border-radius: 999px;
  cursor: pointer;
  font-family: inherit;
  font-weight: 600;
  font-size: 0.95rem;
  transition: all 0.2s;
}

.filter-btn:hover,
.filter-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

/* ============ الفوتر ============ */
.footer {
  background: linear-gradient(135deg, #064e3b, #0f6b4f);
  color: rgba(255,255,255,0.9);
  text-align: center;
  padding: 36px 20px;
  margin-top: 50px;
}

.footer p { margin: 6px 0; font-size: 0.95rem; }

.footer .footer-title { font-weight: 800; font-size: 1.1rem; color: #fff; }

/* ============ التlox الخاص بالبطاقات في الوحدات ============ */
.unit-nav {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin: 30px 0;
  flex-wrap: wrap;
}

.unit-nav a {
  flex: 1;
  min-width: 240px;
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px 22px;
  text-decoration: none;
  color: var(--text);
  border: 1px solid var(--border);
  transition: all 0.2s;
  display: flex;
  align-items: center;
  gap: 12px;
}

.unit-nav a:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.unit-nav a .arrow { font-size: 1.3rem; color: var(--primary); }
.unit-nav a .nav-label { font-weight: 700; color: var(--primary-dark); }
.unit-nav a .nav-sub { font-size: 0.85rem; color: var(--text-muted); }

/* ============ بنك الأسئلة التفاعلي (quiz.js) ============ */
.quiz-panel {
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  padding: 24px;
}

.chips-area { margin-top: 6px; gap: 10px; }

.tab-btn,
.chip {
  background: #fff;
  border: 2px solid var(--border);
  border-radius: 999px;
  padding: 9px 20px;
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text);
  cursor: pointer;
  transition: all 0.2s;
}

.tab-btn:hover, .chip:hover { border-color: var(--primary); color: var(--primary-dark); }

.tab-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

.chip.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.quiz-container { margin-top: 10px; }

.quiz-question {
  background: #fff;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  margin-bottom: 18px;
  transition: border-color 0.3s;
}

.quiz-question.correct-q { border-color: #059669; background: #f0fdf4; }
.quiz-question.wrong-q { border-color: #dc2626; background: #fef2f2; }

.q-head {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

.q-num {
  background: var(--primary);
  color: #fff;
  border-radius: 10px;
  padding: 2px 14px;
  font-weight: 800;
  font-size: 0.9rem;
}

.q-diff {
  color: #fff;
  border-radius: 10px;
  padding: 2px 12px;
  font-weight: 700;
  font-size: 0.8rem;
}

.q-text {
  font-size: 1.08rem;
  font-weight: 700;
  margin-bottom: 14px;
}

.q-opts { display: grid; gap: 10px; }

.opt {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  background: #f9fafb;
  border: 2px solid var(--border);
  border-radius: 12px;
  padding: 10px 14px;
  cursor: pointer;
  transition: all 0.2s;
  font-size: 1rem;
}

.opt:hover { border-color: var(--primary); background: #fff; }

.opt.selected {
  border-color: var(--blue);
  background: var(--blue-light);
}

.opt.show-correct {
  border-color: #059669;
  background: #d1fae5;
  font-weight: 700;
}

.opt input[type="radio"] {
  accent-color: var(--primary);
  width: 17px;
  height: 17px;
  margin-top: 4px;
  flex-shrink: 0;
}

.opt-box b { color: var(--primary-dark); margin-inline-end: 6px; }

.quiz-result {
  text-align: center;
  padding: 24px;
  margin-top: 10px;
}

.big-num { font-size: 2rem; font-weight: 900; color: var(--primary-dark); }
.big-pct { font-size: 1.3rem; font-weight: 800; color: var(--accent); }
.big-msg { font-size: 1.1rem; margin-top: 6px; }

/* ============ Responsive ============ */
@media (max-width: 900px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .lesson { padding: 22px 18px; }
  .navbar-container { flex-direction: column; align-items: flex-start; }
  .navbar nav { width: 100%; overflow-x: auto; }
  .game-shell canvas { height: 400px !important; }
  .info-panel { position: static; max-width: 100%; margin-top: 12px; display: block; }
}

/* تأثير ظهور تدريجي */
.fade-in {
  animation: fadeIn 0.6s ease forwards;
  opacity: 0;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(18px); }
  to { opacity: 1; transform: translateY(0); }
}