/* Arabica - Arabic Learning Platform for Russian Speakers */
:root {
  --primary: #1b4332;
  --primary-hover: #143526;
  --primary-light: #d8f3dc;
  --primary-subtle: #edf7f0;
  --secondary: #b07d4b;
  --secondary-light: #fef8ee;
  --accent: #2d6a4f;
  --dark: #0f172a;
  --text-main: #1e293b;
  --text-muted: #64748b;
  --bg-body: #f8fafc;
  --bg-card: #ffffff;
  --border: #e2e8f0;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.1);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-arabic: "Amiri", "Traditional Arabic", "Scheherazade New", Tahoma, sans-serif;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-body);
  color: var(--text-main);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Typography & Directionality */
.ar-text, [dir="rtl"] {
  direction: rtl;
  text-align: right;
  font-family: var(--font-arabic);
}

.ar-inline {
  direction: rtl;
  unicode-bidi: embed;
  font-family: var(--font-arabic);
  font-size: 1.25em;
  font-weight: 600;
  color: var(--primary);
  background: var(--primary-subtle);
  padding: 2px 8px;
  border-radius: 4px;
  display: inline-block;
  margin: 0 2px;
}

.ar-heading {
  font-family: var(--font-arabic);
  direction: rtl;
  color: var(--secondary);
  font-weight: 700;
}

/* Container */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header & Navigation */
header.site-header {
  background: #ffffff;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: var(--shadow-sm);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand-icon {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  font-weight: bold;
}

.brand-text h1 {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--primary);
  line-height: 1.1;
}

.brand-text span {
  font-size: 0.75rem;
  color: var(--text-muted);
  display: block;
}

nav.main-nav {
  display: flex;
  align-items: center;
  gap: 20px;
}

nav.main-nav a {
  text-decoration: none;
  color: var(--text-main);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
}

nav.main-nav a:hover, nav.main-nav a.active {
  color: var(--primary);
  background: var(--primary-subtle);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  text-decoration: none;
  border: 1px solid transparent;
  transition: all 0.2s ease;
}

.btn-primary {
  background-color: var(--primary);
  color: #ffffff;
}

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

.btn-secondary {
  background-color: var(--secondary-light);
  color: var(--secondary);
  border-color: rgba(176, 125, 75, 0.3);
}

.btn-secondary:hover {
  background-color: #f7eedc;
}

.btn-outline {
  border-color: var(--border);
  color: var(--text-main);
  background: #ffffff;
}

.btn-outline:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.btn-sm {
  padding: 6px 12px;
  font-size: 0.85rem;
}

.btn-danger {
  background: #ef4444;
  color: #fff;
}
.btn-danger:hover {
  background: #dc2626;
}

/* Hero Section */
.hero {
  background: linear-gradient(135deg, #1b4332 0%, #2d6a4f 100%);
  color: #ffffff;
  padding: 60px 0;
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
  margin-bottom: 30px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 40px;
  align-items: center;
}

.hero-content h2 {
  font-size: 2.4rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 16px;
}

.hero-content p {
  font-size: 1.15rem;
  color: #e2f5ea;
  margin-bottom: 24px;
}

.hero-badges {
  display: flex;
  gap: 12px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.hero-badge {
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(8px);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.85rem;
  border: 1px solid rgba(255,255,255,0.2);
}

.hero-card {
  background: #ffffff;
  color: var(--text-main);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-lg);
}

.hero-card h3 {
  color: var(--primary);
  margin-bottom: 12px;
  font-size: 1.2rem;
}

/* Dialect Selector Cards */
.dialect-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  margin-bottom: 40px;
}

.dialect-card {
  background: #ffffff;
  border: 2px solid var(--border);
  border-radius: var(--radius-md);
  padding: 24px;
  text-decoration: none;
  color: inherit;
  transition: all 0.3s ease;
  display: flex;
  flex-direction: column;
}

.dialect-card:hover {
  border-color: var(--primary);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.dialect-icon {
  font-size: 32px;
  margin-bottom: 12px;
}

.dialect-card h3 {
  font-size: 1.25rem;
  margin-bottom: 4px;
  color: var(--primary);
}

.dialect-card .sub-ar {
  font-family: var(--font-arabic);
  font-size: 1.1rem;
  color: var(--secondary);
  direction: rtl;
  margin-bottom: 10px;
}

.dialect-card p {
  color: var(--text-muted);
  font-size: 0.9rem;
  flex-grow: 1;
  margin-bottom: 16px;
}

.dialect-link {
  font-weight: 600;
  color: var(--primary);
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 4px;
}

/* Badges */
.badge {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.badge-free {
  background: #ecfdf5;
  color: #059669;
  border: 1px solid #a7f3d0;
}

.badge-reg {
  background: #eff6ff;
  color: #2563eb;
  border: 1px solid #bfdbfe;
}

.badge-preview {
  background: #fffbeb;
  color: #d97706;
  border: 1px solid #fde68a;
}

.badge-level {
  background: #f1f5f9;
  color: #475569;
}

.badge-dialect {
  background: var(--primary-subtle);
  color: var(--primary);
}

/* Lesson Cards Grid */
.lessons-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
  margin-bottom: 40px;
}

.lesson-card {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 20px;
  display: flex;
  flex-direction: column;
  transition: all 0.25s ease;
  box-shadow: var(--shadow-sm);
  text-decoration: none;
  color: inherit;
}

.lesson-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: #cbd5e1;
}

.lesson-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 8px;
  margin-bottom: 12px;
}

.lesson-meta-badges {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.lesson-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 6px;
  line-height: 1.3;
}

.lesson-card-title-ar {
  font-family: var(--font-arabic);
  font-size: 1.1rem;
  color: var(--secondary);
  direction: rtl;
  margin-bottom: 12px;
  font-weight: bold;
}

.lesson-card-desc {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 16px;
  flex-grow: 1;
}

.lesson-card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 12px;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Lesson View Page */
.lesson-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 30px;
  margin: 30px 0 50px 0;
}

.lesson-main {
  background: #ffffff;
  border-radius: var(--radius-lg);
  padding: 36px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.lesson-header-section {
  border-bottom: 2px solid var(--border);
  padding-bottom: 24px;
  margin-bottom: 28px;
}

.lesson-header-section h1 {
  font-size: 2rem;
  color: var(--primary);
  margin-bottom: 8px;
}

.lesson-header-section .title-ar-large {
  font-family: var(--font-arabic);
  font-size: 1.8rem;
  color: var(--secondary);
  direction: rtl;
  margin-bottom: 16px;
  font-weight: 700;
}

.lesson-meta-bar {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

/* Audio Player Box */
.audio-card {
  background: linear-gradient(135deg, var(--primary-subtle), #e6f7ec);
  border: 1px solid var(--primary-light);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.audio-info {
  display: flex;
  align-items: center;
  gap: 12px;
}

.audio-icon {
  font-size: 28px;
}

/* Video Responsive */
.video-wrapper {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
  margin-bottom: 28px;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.video-wrapper iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

/* Content Text Styling */
.lesson-body {
  font-size: 1.05rem;
  line-height: 1.8;
  color: #334155;
  margin-bottom: 30px;
}

.lesson-body p {
  margin-bottom: 16px;
}

/* Vocabulary Table */
.vocab-section {
  margin: 30px 0;
}

.vocab-section h3 {
  font-size: 1.3rem;
  color: var(--primary);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.vocab-table-wrap {
  overflow-x: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.vocab-table {
  width: 100%;
  border-collapse: collapse;
  background: #ffffff;
  text-align: left;
}

.vocab-table th {
  background: #f8fafc;
  color: var(--text-muted);
  padding: 12px 16px;
  font-size: 0.85rem;
  text-transform: uppercase;
  border-bottom: 1px solid var(--border);
}

.vocab-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}

.vocab-table tr:last-child td {
  border-bottom: none;
}

.vocab-ar {
  font-family: var(--font-arabic);
  font-size: 1.4rem;
  font-weight: 700;
  direction: rtl;
  color: var(--primary);
}

.vocab-translit {
  color: var(--text-muted);
  font-size: 0.9rem;
  font-style: italic;
}

.vocab-ru {
  font-weight: 500;
}

/* Dialogue Box */
.dialogue-section {
  background: #fafaf9;
  border-radius: var(--radius-md);
  padding: 24px;
  margin: 30px 0;
  border: 1px solid var(--border);
}

.dialogue-bubble {
  background: #ffffff;
  border-radius: var(--radius-md);
  padding: 16px 20px;
  margin-bottom: 14px;
  border-left: 4px solid var(--secondary);
  box-shadow: var(--shadow-sm);
}

.dialogue-speaker {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--secondary);
  margin-bottom: 6px;
}

.dialogue-ar {
  font-family: var(--font-arabic);
  font-size: 1.35rem;
  direction: rtl;
  color: var(--dark);
  margin-bottom: 4px;
  font-weight: 600;
}

.dialogue-ru {
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* Paywall / Registration Wall Box */
.paywall-block {
  position: relative;
  margin-top: 30px;
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.paywall-blur-preview {
  filter: blur(5px);
  user-select: none;
  opacity: 0.6;
  pointer-events: none;
  padding: 20px;
}

.paywall-overlay {
  position: relative;
  background: linear-gradient(180deg, rgba(255,255,255,0.85) 0%, #ffffff 100%);
  border: 2px dashed #cbd5e1;
  border-radius: var(--radius-lg);
  padding: 40px 30px;
  text-align: center;
  box-shadow: var(--shadow-md);
  margin-top: -60px;
}

.paywall-overlay h3 {
  font-size: 1.4rem;
  color: var(--primary);
  margin-bottom: 12px;
}

.paywall-overlay p {
  color: var(--text-muted);
  max-width: 500px;
  margin: 0 auto 24px auto;
  font-size: 0.95rem;
}

/* Ad Banners - Flexible & Distinguishable */
.ad-slot {
  background: #f1f5f9;
  border: 1px dashed #cbd5e1;
  border-radius: var(--radius-sm);
  padding: 12px;
  text-align: center;
  margin: 24px 0;
  position: relative;
}

.ad-label {
  font-size: 0.7rem;
  color: #94a3b8;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  display: block;
  margin-bottom: 8px;
}

.ad-banner-mock {
  display: flex;
  align-items: center;
  justify-content: center;
  background: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: 6px;
  padding: 16px;
  color: #64748b;
  font-size: 0.9rem;
}

.ad-horizontal {
  min-height: 90px;
}

.ad-sidebar {
  min-height: 250px;
}

/* Sidebar */
.lesson-sidebar {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.sidebar-box {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 20px;
  box-shadow: var(--shadow-sm);
}

.sidebar-box h4 {
  font-size: 1.1rem;
  color: var(--dark);
  margin-bottom: 14px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 8px;
}

/* Admin Dashboard & Forms */
.admin-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
}

.admin-nav-tabs {
  display: flex;
  gap: 8px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 24px;
  overflow-x: auto;
}

.admin-nav-tab {
  padding: 10px 16px;
  text-decoration: none;
  color: var(--text-muted);
  font-weight: 600;
  border-bottom: 2px solid transparent;
}

.admin-nav-tab.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-bottom: 30px;
}

.stat-card {
  background: #ffffff;
  padding: 20px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.stat-card .stat-number {
  font-size: 2rem;
  font-weight: 800;
  color: var(--primary);
}

.stat-card .stat-title {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  font-weight: 600;
  margin-bottom: 6px;
  font-size: 0.9rem;
  color: var(--dark);
}

.form-control {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  background: #ffffff;
  transition: border-color 0.2s;
}

.form-control:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-subtle);
}

textarea.form-control {
  min-height: 120px;
  resize: vertical;
}

.form-help {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* Footer */
footer.site-footer {
  background: #ffffff;
  border-top: 1px solid var(--border);
  margin-top: auto;
  padding: 40px 0 20px 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 30px;
}

.footer-col h4 {
  font-size: 1rem;
  color: var(--dark);
  margin-bottom: 14px;
}

.footer-col ul {
  list-style: none;
}

.footer-col ul li {
  margin-bottom: 8px;
}

.footer-col ul li a {
  text-decoration: none;
  color: var(--text-muted);
  font-size: 0.9rem;
  transition: color 0.2s;
}

.footer-col ul li a:hover {
  color: var(--primary);
}

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  color: var(--text-muted);
  flex-wrap: wrap;
  gap: 10px;
}

/* Responsive Media Queries */
@media (max-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }
  .lesson-layout {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
}

@media (max-width: 650px) {
  .nav-wrap {
    height: auto;
    padding: 12px 0;
    flex-wrap: wrap;
    gap: 12px;
  }
  nav.main-nav {
    order: 3;
    width: 100%;
    overflow-x: auto;
    padding-bottom: 6px;
  }
  .hero-content h2 {
    font-size: 1.8rem;
  }
  .lesson-main {
    padding: 20px;
  }
}