/* ═══════════════════════════════════════════════
   🎨 PREMIUM UI — 8. Sınıf LGS Ders Özetleri
   ═══════════════════════════════════════════════ */

/* ── Design Tokens ───────────────────────────── */
:root {
  --bg: #f0f2f5;
  --bg-secondary: #e4e7ec;
  --kart: rgba(255, 255, 255, 0.82);
  --kart-solid: #ffffff;
  --yazi: #1a1d26;
  --yazi-secondary: #4a5068;
  --mut: #6b7394;
  --kenar: rgba(0, 0, 0, 0.06);
  --accent: #6366f1;
  --accent-light: #818cf8;
  --accent-glow: rgba(99, 102, 241, 0.25);
  --success: #10b981;
  --danger: #ef4444;
  --warning: #f59e0b;
  --gradient-1: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --glass-blur: 16px;
  --glass-bg: rgba(255, 255, 255, 0.65);
  --glass-border: rgba(255, 255, 255, 0.3);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
  --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.16);
  --radius-sm: 10px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 24px;
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ── Dark Mode Tokens ────────────────────────── */
body.dark {
  --bg: #0f1117;
  --bg-secondary: #1a1d28;
  --kart: rgba(30, 33, 44, 0.85);
  --kart-solid: #1e212c;
  --yazi: #e8eaed;
  --yazi-secondary: #a0a6bc;
  --mut: #7a809a;
  --kenar: rgba(255, 255, 255, 0.06);
  --accent: #818cf8;
  --accent-light: #a5b4fc;
  --accent-glow: rgba(129, 140, 248, 0.2);
  --glass-bg: rgba(30, 33, 44, 0.7);
  --glass-border: rgba(255, 255, 255, 0.08);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.25);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.35);
  --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.45);
}

/* ── Base ─────────────────────────────────────── */
* { box-sizing: border-box; }

body {
  background: var(--bg);
  color: var(--yazi);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  transition: background var(--transition-base), color var(--transition-base);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

a { color: var(--accent); transition: color var(--transition-fast); }
a:hover { color: var(--accent-light); }

/* ── Scroll Progress Bar ─────────────────────── */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  background: var(--gradient-1);
  z-index: 10001;
  width: 0%;
  transition: none;
  border-radius: 0 2px 2px 0;
}

/* ── Premium Navbar ──────────────────────────── */
.premium-navbar {
  background: linear-gradient(135deg, rgba(30,33,64,0.85) 0%, rgba(45,27,105,0.85) 50%, rgba(30,33,64,0.85) 100%) !important;
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.15);
  padding: 0.6rem 0;
}

.premium-navbar .navbar-brand {
  font-weight: 700;
  letter-spacing: -0.02em;
  font-size: 1.15rem;
}

.premium-navbar .btn-outline-light {
  border-color: rgba(255, 255, 255, 0.2);
  color: rgba(255, 255, 255, 0.85);
  font-weight: 500;
  font-size: 0.82rem;
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  backdrop-filter: blur(6px);
}

.premium-navbar .btn-outline-light:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.35);
  color: #fff;
  transform: translateY(-1px);
}

/* Ders navbar'larını renkli gradient yap */
.navbar-ders {
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.15);
}

/* ── Glass Card ──────────────────────────────── */
.card {
  background: var(--kart);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  color: var(--yazi);
  border: 1px solid var(--kenar);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
}

.card-header {
  background: transparent;
  border-bottom: 1px solid var(--kenar);
  font-weight: 600;
  padding: 0.85rem 1.1rem;
}

.card-title {
  color: var(--yazi);
  font-weight: 700;
  letter-spacing: -0.01em;
}

/* ── Ders Kartları (Ana Sayfa) ───────────────── */
.ders-kart {
  cursor: pointer;
  border-radius: var(--radius-lg) !important;
  border: none !important;
  background: var(--kart);
  backdrop-filter: blur(var(--glass-blur));
  position: relative;
  overflow: hidden;
  height: 160px;
  transition: transform var(--transition-base),
              box-shadow var(--transition-base);
}

.ders-kart::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 5px;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  transition: height var(--transition-base);
}

.ders-kart::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius-lg);
  background: radial-gradient(circle at 50% 0%, rgba(255,255,255,0.15) 0%, transparent 60%);
  opacity: 0;
  transition: opacity var(--transition-base);
  pointer-events: none;
}

.ders-kart:hover {
  transform: translateY(-8px) scale(1.02);
  box-shadow: var(--shadow-xl) !important;
}

.ders-kart:hover::before {
  height: 6px;
}

.ders-kart:hover::after {
  opacity: 1;
}

.ders-kart:active {
  transform: translateY(-2px) scale(0.98);
}

.ders-ikon {
  font-size: 3.2rem;
  line-height: 1;
  filter: drop-shadow(0 2px 4px rgba(0,0,0,0.1));
  transition: transform var(--transition-base);
}

.ders-kart:hover .ders-ikon {
  transform: scale(1.12) rotate(-3deg);
}

/* ── İstatistik Kartları ─────────────────────── */
.stat-card {
  background: var(--kart);
  backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--kenar);
  border-radius: var(--radius-md);
  padding: 1rem 0.5rem;
  text-align: center;
  position: relative;
  overflow: hidden;
  transition: all var(--transition-base);
}

.stat-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
}

.stat-card:nth-child(1)::before { background: var(--gradient-1); }
.stat-card:nth-child(2)::before { background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%); }
.stat-card:nth-child(3)::before { background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%); }
.stat-card:nth-child(4)::before { background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%); }

.stat-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.stat-card h4 {
  font-weight: 800;
  font-size: 1.6rem;
  margin-bottom: 0;
  background: var(--gradient-1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-card:nth-child(2) h4 { background: linear-gradient(135deg, #f093fb, #f5576c); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.stat-card:nth-child(3) h4 { background: linear-gradient(135deg, #4facfe, #00f2fe); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.stat-card:nth-child(4) h4 { background: linear-gradient(135deg, #43e97b, #38f9d7); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }

.stat-card small {
  color: var(--mut);
  font-weight: 500;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ── Arama Kutusu ────────────────────────────── */
.search-box {
  position: relative;
}

.search-box .form-control {
  background: var(--kart);
  backdrop-filter: blur(var(--glass-blur));
  border: 2px solid var(--kenar);
  border-radius: var(--radius-md);
  padding: 0.85rem 1.2rem;
  font-size: 1.05rem;
  color: var(--yazi);
  transition: all var(--transition-base);
  box-shadow: var(--shadow-sm);
}

.search-box .form-control:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-glow), var(--shadow-md);
  background: var(--kart-solid);
  outline: none;
}

.search-box .form-control::placeholder {
  color: var(--mut);
  font-weight: 400;
}

.search-box .btn {
  background: var(--gradient-1);
  border: none;
  border-radius: var(--radius-md);
  padding: 0.85rem 1.8rem;
  font-weight: 600;
  color: #fff;
  transition: all var(--transition-fast);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.search-box .btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(99, 102, 241, 0.4);
}

/* ── Breadcrumb ──────────────────────────────── */
.breadcrumb {
  background: var(--kart);
  backdrop-filter: blur(var(--glass-blur));
  padding: 0.65rem 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--kenar);
  font-size: 0.85rem;
  box-shadow: var(--shadow-sm);
  margin-bottom: 1rem;
}

.breadcrumb-item a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
}

.breadcrumb-item.active { color: var(--mut); }

body.dark .breadcrumb-item,
body.dark .breadcrumb-item a { color: var(--yazi); }
body.dark .breadcrumb-item a { color: var(--accent-light); }
body.dark .breadcrumb-item.active { color: var(--mut); }

/* ── Liste Öğeleri ───────────────────────────── */
.list-group-item {
  background: var(--kart);
  color: var(--yazi);
  border-color: var(--kenar);
  border-radius: var(--radius-sm) !important;
  margin-bottom: 0.5rem;
  padding: 1rem 1.2rem;
  transition: all var(--transition-fast);
  border: 1px solid var(--kenar);
}

.list-group-item:hover,
.list-group-item:focus {
  background: var(--kart-solid);
  transform: translateX(4px);
  box-shadow: var(--shadow-md);
  border-color: var(--accent);
}

body.dark .list-group-item {
  background: var(--kart);
  color: var(--yazi);
  border-color: var(--kenar);
}

body.dark .list-group-item:hover {
  background: var(--kart-solid);
}

/* ── Dark Mode Overrides ─────────────────────── */
body.dark .form-control {
  background: var(--bg-secondary);
  color: var(--yazi);
  border-color: var(--kenar);
}

body.dark .text-muted { color: var(--mut) !important; }

body.dark .premium-navbar {
  background: linear-gradient(135deg, rgba(10,12,21,0.9) 0%, rgba(26,16,64,0.9) 50%, rgba(10,12,21,0.9) 100%) !important;
}

body.dark .btn-primary,
body.dark .search-box .btn {
  background: var(--gradient-1);
}

/* ── Premium Carousel ────────────────────────── */
.carousel {
  border-radius: var(--radius-md);
  overflow: hidden;
  touch-action: pan-y;
}

.carousel-inner {
  border-radius: var(--radius-md);
}

.carousel-item img {
  transition: opacity 0.4s ease;
}

.carousel-control-prev-icon,
.carousel-control-next-icon {
  background-color: rgba(0, 0, 0, 0.45);
  border-radius: 50%;
  padding: 22px;
  backdrop-filter: blur(8px);
  transition: all var(--transition-fast);
}

.carousel-control-prev:hover .carousel-control-prev-icon,
.carousel-control-next:hover .carousel-control-next-icon {
  background-color: rgba(0, 0, 0, 0.65);
  transform: scale(1.1);
}

/* Slayt sayacı */
.carousel-counter {
  position: absolute;
  bottom: 16px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(0, 0, 0, 0.55);
  backdrop-filter: blur(8px);
  color: #fff;
  padding: 4px 14px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  z-index: 5;
  pointer-events: none;
  letter-spacing: 0.03em;
}

/* Büyüt & İndir butonları */
.slide-actions {
  position: absolute;
  right: 14px;
  bottom: 14px;
  z-index: 10;
  display: flex;
  gap: 8px;
}

.slide-action-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  opacity: 0.75;
  transition: all var(--transition-fast);
  backdrop-filter: blur(8px);
  cursor: pointer;
  text-decoration: none;
}

.slide-action-btn:hover {
  opacity: 1;
  transform: scale(1.1);
  color: #fff;
}

.slide-action-btn.btn-zoom { background: rgba(99, 102, 241, 0.8); }
.slide-action-btn.btn-download { background: rgba(16, 185, 129, 0.8); }

/* ── Swipe Hint ──────────────────────────────── */
.swipe-hint {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 20;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  pointer-events: none;
  animation: swipeHintFade 3s ease forwards;
}

.swipe-hint-icon {
  width: 50px;
  height: 50px;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(8px);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: swipeHintSlide 1.5s ease-in-out infinite;
}

.swipe-hint-icon svg {
  width: 24px;
  height: 24px;
  color: #fff;
}

.swipe-hint-text {
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(8px);
  color: #fff;
  padding: 4px 12px;
  border-radius: 12px;
  font-size: 0.75rem;
  font-weight: 600;
  white-space: nowrap;
}

@keyframes swipeHintSlide {
  0%, 100% { transform: translateX(-12px); }
  50% { transform: translateX(12px); }
}

@keyframes swipeHintFade {
  0%, 70% { opacity: 1; }
  100% { opacity: 0; visibility: hidden; }
}

/* ── Premium Lightbox ────────────────────────── */
#lightbox {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: rgba(0, 0, 0, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

#lightbox.acik { display: flex; }

.lb-img-wrap {
  width: 100vw;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

#lb-img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  border-radius: var(--radius-sm);
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.5);
  transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1),
              opacity 0.3s ease;
  user-select: none;
  -webkit-user-drag: none;
  touch-action: none;
  cursor: zoom-in;
}

#lb-img.sliding-left {
  animation: slideLeft 0.35s cubic-bezier(0.22, 1, 0.36, 1);
}

#lb-img.sliding-right {
  animation: slideRight 0.35s cubic-bezier(0.22, 1, 0.36, 1);
}

@keyframes slideLeft {
  0% { transform: translateX(60px); opacity: 0.4; }
  100% { transform: translateX(0); opacity: 1; }
}

@keyframes slideRight {
  0% { transform: translateX(-60px); opacity: 0.4; }
  100% { transform: translateX(0); opacity: 1; }
}

.lb-kapat {
  position: fixed;
  top: 12px;
  right: 18px;
  color: rgba(255, 255, 255, 0.8);
  font-size: 2rem;
  cursor: pointer;
  z-index: 10000;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  transition: all var(--transition-fast);
  line-height: 1;
}

.lb-kapat:hover {
  background: rgba(255, 255, 255, 0.2);
  color: #fff;
  transform: rotate(90deg);
}

.lb-indir {
  position: fixed;
  top: 12px;
  right: 72px;
  color: rgba(255, 255, 255, 0.8);
  cursor: pointer;
  z-index: 10000;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  transition: all var(--transition-fast);
  text-decoration: none;
}

.lb-indir:hover {
  background: rgba(255, 255, 255, 0.2);
  color: #fff;
  transform: scale(1.08);
}

.lb-btn {
  position: fixed;
  top: 50%;
  transform: translateY(-50%);
  color: rgba(255, 255, 255, 0.8);
  font-size: 1.5rem;
  cursor: pointer;
  z-index: 10000;
  user-select: none;
  width: 50px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  transition: all var(--transition-fast);
}

.lb-btn:hover {
  background: rgba(255, 255, 255, 0.2);
  color: #fff;
  transform: translateY(-50%) scale(1.1);
}

.lb-prev { left: 12px; }
.lb-next { right: 12px; }

.lb-sayac {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.85rem;
  font-weight: 600;
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(8px);
  padding: 6px 18px;
  border-radius: 20px;
  letter-spacing: 0.05em;
}

/* ── PDF Viewer ──────────────────────────────── */
.pdf-container .btn-dark {
  background: var(--gradient-1);
  border: none;
  border-radius: var(--radius-sm);
  font-weight: 600;
  transition: all var(--transition-fast);
}

.pdf-container .btn-dark:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.pdf-load-btn {
  background: var(--gradient-1) !important;
  border: none !important;
  border-radius: var(--radius-md) !important;
  font-weight: 600;
  padding: 0.75rem 2rem !important;
  color: #fff !important;
  transition: all var(--transition-fast);
  box-shadow: 0 4px 16px rgba(99, 102, 241, 0.3);
}

.pdf-load-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(99, 102, 241, 0.4);
}

/* ── Rozet ────────────────────────────────────── */
.yeni-rozet {
  font-size: 0.6rem;
  vertical-align: middle;
  background: linear-gradient(135deg, #ef4444, #f97316) !important;
  border: none;
  animation: rozetPulse 2s ease-in-out infinite;
}

@keyframes rozetPulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.4); }
  50% { box-shadow: 0 0 0 6px rgba(239, 68, 68, 0); }
}

/* ── Tema Butonu ──────────────────────────────── */
.tema-btn {
  cursor: pointer;
  transition: transform var(--transition-fast);
}

.tema-btn:hover {
  transform: rotate(20deg) scale(1.1);
}

/* ── Sayfa Başlığı ───────────────────────────── */
.page-title {
  font-weight: 800;
  letter-spacing: -0.02em;
  background: var(--gradient-1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  position: relative;
  display: inline-block;
}

.page-title::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 50%;
  transform: translateX(-50%);
  width: 50px;
  height: 3px;
  background: var(--gradient-1);
  border-radius: 2px;
}

/* ── Premium Footer ──────────────────────────── */
.premium-footer {
  background: var(--kart);
  backdrop-filter: blur(var(--glass-blur));
  border-top: 1px solid var(--kenar);
  padding: 1.2rem 0;
  margin-top: 3rem;
  color: var(--mut);
  font-size: 0.85rem;
  font-weight: 500;
}

/* ── Paylaş Butonu ───────────────────────────── */
.btn-share {
  background: linear-gradient(135deg, #25d366, #128c7e) !important;
  border: none;
  color: #fff !important;
  border-radius: var(--radius-sm);
  font-weight: 600;
  padding: 0.3rem 0.8rem;
  font-size: 0.82rem;
  transition: all var(--transition-fast);
  box-shadow: 0 2px 8px rgba(37, 211, 102, 0.3);
}

.btn-share:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(37, 211, 102, 0.4);
}

/* ── Ripple Efekti ───────────────────────────── */
.ripple {
  position: relative;
  overflow: hidden;
}

.ripple::after {
  content: '';
  position: absolute;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.3);
  width: 100px;
  height: 100px;
  margin-top: -50px;
  margin-left: -50px;
  top: 50%;
  left: 50%;
  transform: scale(0);
  opacity: 1;
  pointer-events: none;
}

.ripple:active::after {
  animation: rippleEffect 0.6s ease-out;
}

@keyframes rippleEffect {
  to { transform: scale(4); opacity: 0; }
}

/* ── Animate-in (Scroll) ─────────────────────── */
.animate-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s cubic-bezier(0.22, 1, 0.36, 1),
              transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}

.animate-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger delays */
.animate-in:nth-child(1) { transition-delay: 0s; }
.animate-in:nth-child(2) { transition-delay: 0.06s; }
.animate-in:nth-child(3) { transition-delay: 0.12s; }
.animate-in:nth-child(4) { transition-delay: 0.18s; }
.animate-in:nth-child(5) { transition-delay: 0.24s; }
.animate-in:nth-child(6) { transition-delay: 0.30s; }

/* ── iframe ──────────────────────────────────── */
iframe {
  border-radius: var(--radius-md);
  border: 1px solid var(--kenar);
}

/* ── Alert ───────────────────────────────────── */
.alert {
  border-radius: var(--radius-md);
  border: none;
  font-weight: 500;
}

/* ── Badge ───────────────────────────────────── */
.badge {
  font-weight: 600;
  border-radius: 8px;
  padding: 0.4em 0.8em;
}

.badge.bg-primary {
  background: var(--gradient-1) !important;
}

/* ── Giriş Kartı ─────────────────────────────── */
.login-card {
  background: var(--kart);
  backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--kenar);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  overflow: hidden;
}

.login-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-1);
}

/* ── Meta Info ────────────────────────────────── */
.meta-info {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  font-size: 0.85rem;
  color: var(--mut);
}

.meta-info span {
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

/* ── Mobil Responsive ────────────────────────── */
@media (max-width: 768px) {
  .premium-navbar .navbar-brand {
    font-size: 1rem;
    max-width: 55%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .premium-navbar .btn-outline-light {
    font-size: 0.75rem;
    padding: 0.3rem 0.55rem;
  }

  .stat-card h4 { font-size: 1.3rem; }
  .stat-card small { font-size: 0.65rem; }
  .stat-card { padding: 0.7rem 0.3rem; }

  .ders-ikon { font-size: 2.6rem; }
  .ders-kart .card-title { font-size: 0.95rem; }

  .page-title { font-size: 1.4rem; }

  .lb-btn { width: 40px; height: 40px; font-size: 1.2rem; }
  .lb-kapat { width: 38px; height: 38px; font-size: 1.6rem; }
  .lb-indir { width: 38px; height: 38px; right: 64px; }
  #lb-img { max-width: 100%; }

  .slide-action-btn { width: 38px; height: 38px; }
}

@media (max-width: 576px) {
  .search-box .form-control { font-size: 0.95rem; padding: 0.7rem 1rem; }
  .search-box .btn { padding: 0.7rem 1.2rem; font-size: 0.9rem; }

  .carousel-control-prev, .carousel-control-next { width: 40px; }
  .carousel-control-prev-icon, .carousel-control-next-icon { padding: 16px; }
}

/* ── Alt Başlık Collapse Stilleri ────────────── */
.sub-section-trigger {
  user-select: none;
  background: var(--kart) !important;
  border: 1px solid var(--kenar);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast) !important;
}

.sub-section-trigger:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md) !important;
  border-color: var(--accent);
}

.sub-section-trigger .collapse-icon {
  display: inline-block;
  font-size: 0.85rem;
  color: var(--mut);
  transition: transform var(--transition-fast) !important;
}

.sub-section-trigger.collapsed .collapse-icon {
  transform: rotate(0deg) !important;
}

.sub-section-trigger:not(.collapsed) .collapse-icon {
  transform: rotate(90deg) !important;
}

/* ── Dosya Grid Tasarımı (Öğretmen Paneli) ────── */
.sortable-flat-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 15px;
  padding: 12px 6px;
}

.flat-heading-item {
  grid-column: 1 / -1;
  width: 100%;
}

.flat-file-item {
  min-width: 180px;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.flat-file-item.flat-collapsed {
  display: none !important;
}

.ab-arrow.rotated {
  transform: rotate(-90deg) !important;
}

.grid-card {
  transition: all var(--transition-fast);
  border: 1px solid var(--kenar);
  overflow: hidden;
  border-radius: var(--radius-sm);
  background: var(--kart-solid);
}
.grid-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.grid-cb-wrap {
  position: absolute;
  top: 8px;
  left: 8px;
  z-index: 10;
  background: rgba(255, 255, 255, 0.9);
  padding: 2px 6px;
  border-radius: 6px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
  display: flex;
  align-items: center;
  gap: 4px;
}
body.dark .grid-cb-wrap {
  background: rgba(30, 33, 44, 0.9);
}

.grid-img {
  width: 100%;
  height: 130px;
  object-fit: cover;
  border-bottom: 1px solid var(--kenar);
}

.grid-footer {
  padding: 8px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
  background: var(--bg-secondary);
}

.grid-fname {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--yazi-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-truncate: ellipsis;
  max-width: 110px;
}

/* ── Print ───────────────────────────────────── */
@media print {
  .premium-navbar, .premium-footer, .scroll-progress,
  .lb-kapat, .lb-btn, .swipe-hint { display: none !important; }
  body { background: #fff !important; color: #000 !important; }
  .card { box-shadow: none !important; border: 1px solid #ccc !important; }
}