/* ============================================
   tiyatrooyunlari.com — Ana Stil Dosyası
   Dark Premium Theme — Sanat Portfolyosu
   ============================================ */

/* ---------- CSS Custom Properties ---------- */
:root {
  /* ---- LANDING PAGE (Dark Theme) ---- */
  --bg-primary: #0A0A0A;
  --bg-secondary: #111111;
  --bg-card: #161616;
  --bg-card-hover: #1C1C1C;
  --bg-surface: #1A1A1A;

  --color-primary: #D4A84B;
  --color-primary-hover: #E6BE6A;
  --color-primary-light: rgba(212, 168, 75, 0.15);
  --color-secondary: #C0945A;
  --color-accent: #E8C672;

  --text-primary: #F0ECE3;
  --text-secondary: #A09A8D;
  --text-tertiary: #6B6560;
  --text-white: #FFFFFF;

  --border-light: rgba(255, 255, 255, 0.06);
  --border-accent: rgba(212, 168, 75, 0.25);

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
  --shadow-lg: 0 10px 30px rgba(0,0,0,0.5);
  --shadow-xl: 0 20px 50px rgba(0,0,0,0.6);
  --shadow-glow: 0 0 40px rgba(212, 168, 75, 0.08);
  --shadow-glow-lg: 0 0 60px rgba(212, 168, 75, 0.12);

  /* Typography */
  --font-signature: 'Alex Brush', cursive;
  --font-display: 'Playfair Display', Georgia, serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Spacing */
  --container-max: 1200px;
  --section-padding: 100px;
  --card-radius: 16px;
  --btn-radius: 12px;

  /* Transitions */
  --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);
  --transition-spring: 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

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

a {
  text-decoration: none;
  color: inherit;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  outline: none;
}

/* ---------- Utility ---------- */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

/* ---------- Scroll Reveal ---------- */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* ============================================
   HEADER / NAVBAR
   ============================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 20px 0;
  transition: var(--transition-base);
  background: transparent;
}

.navbar.scrolled {
  background: rgba(10, 10, 10, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-light);
  padding: 14px 0;
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.4);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.navbar-brand .brand-text {
  font-family: var(--font-signature);
  font-size: 24px;
  font-weight: 400;
  color: var(--color-primary);
  letter-spacing: 1px;
}

.navbar-links {
  display: flex;
  align-items: center;
  gap: 36px;
  list-style: none;
}

.navbar-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: var(--transition-fast);
  position: relative;
  text-transform: uppercase;
  letter-spacing: 1.5px;
}

.navbar-links a::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--color-primary);
  transition: var(--transition-base);
}

.navbar-links a:hover {
  color: var(--color-primary);
}

.navbar-links a:hover::after {
  width: 100%;
}

/* Mobile menu button */
.menu-toggle {
  display: none;
  background: none;
  width: 36px;
  height: 36px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
}

.menu-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition-fast);
}

.menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}
.menu-toggle.active span:nth-child(2) {
  opacity: 0;
}
.menu-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
  min-height: 55vh;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  text-align: center;
  position: relative;
  overflow: hidden;
  padding: 140px 24px 60px;
  /* background-image set inline via PHP */
  background-size: cover;
  background-position: center top;
  background-repeat: no-repeat;
}

/* Subtle animated grain overlay */
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: repeating-conic-gradient(
    rgba(255,255,255,0.01) 0%,
    transparent 0.5%
  );
  opacity: 0.3;
  pointer-events: none;
  z-index: 0;
}

/* Bottom fade to blend into next section */
.hero::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 200px;
  background: linear-gradient(to top, var(--bg-primary), transparent);
  pointer-events: none;
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 780px;
}

/* El yazısı imza stili (Artık küçük/alt başlık) */
.hero-signature {
  font-family: var(--font-signature);
  font-size: clamp(24px, 4vw, 36px);
  color: var(--color-primary);
  line-height: 1.2;
  margin-top: 12px;
  text-shadow: 0 0 40px rgba(212, 168, 75, 0.2);
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(40px, 7vw, 72px);
  font-weight: 400;
  color: var(--text-primary);
  line-height: 1.1;
  letter-spacing: 6px;
  text-transform: uppercase;
}

.hero-subtitle {
  font-size: clamp(15px, 1.8vw, 18px);
  color: var(--text-tertiary);
  max-width: 540px;
  margin: 0 auto 40px;
  line-height: 1.8;
  font-weight: 300;
}

.hero-divider {
  width: 60px;
  height: 1px;
  background: var(--color-primary);
  margin: 0 auto 40px;
  opacity: 0.5;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: transparent;
  color: var(--color-primary);
  padding: 16px 40px;
  border: 1px solid var(--border-accent);
  border-radius: 0;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 3px;
  text-transform: uppercase;
  transition: var(--transition-base);
}

.hero-cta:hover {
  background: var(--color-primary);
  color: var(--bg-primary);
  border-color: var(--color-primary);
  box-shadow: var(--shadow-glow-lg);
}

.hero-cta svg {
  width: 18px;
  height: 18px;
  transition: var(--transition-fast);
}

.hero-cta:hover svg {
  transform: translateY(4px);
}

/* Scroll indicator */
.scroll-indicator {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--text-tertiary);
  font-size: 10px;
  font-weight: 400;
  letter-spacing: 2px;
  text-transform: uppercase;
  z-index: 2;
  animation: bounce 2.5s ease-in-out infinite;
}

.scroll-indicator .mouse {
  width: 20px;
  height: 32px;
  border: 1.5px solid var(--text-tertiary);
  border-radius: 10px;
  position: relative;
}

.scroll-indicator .mouse::after {
  content: '';
  position: absolute;
  top: 6px;
  left: 50%;
  transform: translateX(-50%);
  width: 2px;
  height: 6px;
  background: var(--color-primary);
  border-radius: 2px;
  animation: scrollDot 2s ease-in-out infinite;
}

@keyframes scrollDot {
  0%, 100% { top: 6px; opacity: 1; }
  50% { top: 16px; opacity: 0.3; }
}

@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(8px); }
}

/* ============================================
   BOOKS / ESERLER SECTION
   ============================================ */
.books-section {
  padding: 20px 24px var(--section-padding);
  background: var(--bg-primary);
  position: relative;
}

.books-section-inner {
  max-width: 1100px;
  margin: 0 auto;
  background: var(--bg-card);
  border-radius: 24px;
  border: 1px solid var(--border-light);
  padding: 60px 48px;
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow: hidden;
}

/* Subtle decorative corner accents */
.books-section-inner::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle at top left, rgba(212, 168, 75, 0.03), transparent 70%);
  pointer-events: none;
}

.books-section-inner::after {
  content: '';
  position: absolute;
  bottom: 0;
  right: 0;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle at bottom right, rgba(212, 168, 75, 0.03), transparent 70%);
  pointer-events: none;
}

.section-header {
  text-align: center;
  margin-bottom: 48px;
  position: relative;
  z-index: 1;
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-size: 11px;
  font-weight: 500;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 3px;
  margin-bottom: 16px;
}

.section-label::before,
.section-label::after {
  content: '';
  width: 30px;
  height: 1px;
  background: var(--color-primary);
  opacity: 0.4;
}

.section-header h2 {
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}

.section-header p {
  font-size: 15px;
  color: var(--text-tertiary);
  max-width: 480px;
  margin: 0 auto;
  font-weight: 300;
}

/* ---------- Category Tabs ---------- */
.category-tabs-container {
  margin-bottom: 40px;
  position: relative;
  z-index: 1;
}

.category-tabs {
  display: flex;
  justify-content: center;
  gap: 6px;
  flex-wrap: wrap;
}

.tab-btn {
  padding: 10px 28px;
  background: transparent;
  color: var(--text-tertiary);
  border: 1px solid var(--border-light);
  border-radius: 0;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 2px;
  text-transform: uppercase;
  transition: var(--transition-base);
  cursor: pointer;
  position: relative;
}

.tab-btn:hover {
  color: var(--text-primary);
  border-color: var(--text-tertiary);
}

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

/* ---------- Book Grid ---------- */
.books-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 28px;
  position: relative;
  z-index: 1;
}

/* ---------- Book Card ---------- */
.book-card {
  background: var(--bg-surface);
  border-radius: var(--card-radius);
  border: 1px solid var(--border-light);
  overflow: hidden;
  transition: var(--transition-base);
  position: relative;
  cursor: pointer;
}

.book-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-glow);
  border-color: var(--border-accent);
}

/* Filter animation */
.book-card.card-hidden {
  opacity: 0;
  transform: scale(0.95) translateY(10px);
  pointer-events: none;
  transition: opacity 0.25s ease, transform 0.25s ease;
}

.book-card.card-visible {
  opacity: 1;
  transform: scale(1) translateY(0);
  pointer-events: auto;
  transition: opacity 0.35s ease, transform 0.35s ease;
}

/* Cover image wrapper */
.book-card-cover {
  position: relative;
  width: 100%;
  aspect-ratio: 3 / 4;
  overflow: hidden;
  background: var(--bg-secondary);
  cursor: pointer;
}

.book-card-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition-slow);
}

.book-card:hover .book-card-cover img {
  transform: scale(1.06);
}

/* Gradient overlay on cover */
.book-card-cover::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 50%;
  background: linear-gradient(to top, rgba(0,0,0,0.5), transparent);
  pointer-events: none;
  z-index: 1;
}

/* Category badge */
.card-category-badge {
  position: absolute;
  top: 14px;
  right: 14px;
  padding: 5px 14px;
  background: rgba(10, 10, 10, 0.7);
  backdrop-filter: blur(10px);
  color: var(--color-primary);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  border: 1px solid var(--border-accent);
  z-index: 2;
}

/* Placeholder when no cover */
.book-card-cover .placeholder-cover {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--bg-secondary), var(--bg-surface));
  color: var(--color-primary);
  gap: 12px;
}

.placeholder-cover svg {
  width: 48px;
  height: 48px;
  opacity: 0.3;
}

.placeholder-cover span {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 600;
  opacity: 0.4;
  text-align: center;
  padding: 0 24px;
}

/* Card body */
.book-card-body {
  padding: 24px;
}

.book-card-body h3 {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
  line-height: 1.3;
}

.book-card-author {
  font-size: 13px;
  color: var(--color-primary);
  font-weight: 500;
  margin-bottom: 12px;
  letter-spacing: 0.3px;
}

.book-card-desc {
  font-size: 14px;
  color: var(--text-tertiary);
  line-height: 1.6;
  margin-bottom: 20px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* Card buttons */
.book-card-actions {
  display: flex;
  gap: 10px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 20px;
  border-radius: var(--btn-radius);
  font-size: 14px;
  font-weight: 600;
  transition: var(--transition-base);
  flex: 1;
  text-align: center;
}

.btn svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

.btn-primary {
  background: var(--color-primary);
  color: var(--bg-primary);
  border: none;
}

.btn-primary:hover {
  background: var(--color-primary-hover);
  box-shadow: var(--shadow-glow);
  transform: translateY(-1px);
}

.btn-secondary {
  background: transparent;
  color: var(--color-primary);
  border: 1px solid var(--border-accent);
}

.btn-secondary:hover {
  background: var(--color-primary);
  color: var(--bg-primary);
  transform: translateY(-1px);
}

/* ============================================
   NO BOOKS STATE
   ============================================ */
.no-books {
  text-align: center;
  padding: 60px 24px;
  color: var(--text-secondary);
}

.no-books svg {
  width: 64px;
  height: 64px;
  color: var(--text-tertiary);
  margin-bottom: 16px;
}

.no-books h3 {
  font-family: var(--font-display);
  font-size: 22px;
  color: var(--text-primary);
  margin-bottom: 8px;
}

/* ============================================
   ABOUT SECTION
   ============================================ */
.about-section {
  padding: var(--section-padding) 24px;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-light);
}

.about-content {
  max-width: 720px;
  margin: 0 auto;
  text-align: center;
}

.about-content h2 {
  font-family: var(--font-display);
  font-size: clamp(24px, 3vw, 36px);
  margin-bottom: 20px;
  color: var(--text-primary);
}

.about-content p {
  font-size: 16px;
  color: var(--text-tertiary);
  line-height: 1.9;
  font-weight: 300;
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
  background: var(--bg-primary);
  border-top: 1px solid var(--border-light);
  padding: 48px 24px;
  text-align: center;
}

.footer-brand {
  font-family: var(--font-signature);
  font-size: 28px;
  font-weight: 400;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.footer p {
  font-size: 13px;
  color: var(--text-tertiary);
  letter-spacing: 1px;
}

.footer-divider {
  width: 40px;
  height: 1px;
  background: var(--color-primary);
  margin: 20px auto;
  opacity: 0.3;
}

.footer-copy {
  font-size: 12px;
  color: var(--text-tertiary);
  letter-spacing: 0.5px;
}

/* ============================================
   BOOK DETAIL MODAL
   ============================================ */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition-base);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal-content {
  background: var(--bg-card);
  border-radius: 20px;
  border: 1px solid var(--border-light);
  max-width: 800px;
  width: 100%;
  max-height: 85vh;
  overflow-y: auto;
  box-shadow: var(--shadow-xl);
  transform: translateY(20px) scale(0.97);
  transition: var(--transition-spring);
  position: relative;
}

.modal-overlay.active .modal-content {
  transform: translateY(0) scale(1);
}

.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(255,255,255,0.08);
  backdrop-filter: blur(10px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
  transition: var(--transition-fast);
}

.modal-close:hover {
  background: rgba(255,255,255,0.15);
}

.modal-close svg {
  width: 18px;
  height: 18px;
  color: var(--text-secondary);
}

.modal-grid {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 0;
}

.modal-cover {
  background: var(--bg-secondary);
  overflow: hidden;
  border-radius: 20px 0 0 20px;
  min-height: 380px;
}

.modal-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.modal-cover .placeholder-cover {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--bg-secondary), var(--bg-surface));
}

.modal-info {
  padding: 40px 36px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.modal-info h2 {
  font-family: var(--font-display);
  font-size: 26px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
  line-height: 1.3;
}

.modal-author {
  font-size: 15px;
  color: var(--color-primary);
  font-weight: 500;
  margin-bottom: 20px;
  letter-spacing: 0.5px;
}

.modal-desc {
  font-size: 15px;
  color: var(--text-tertiary);
  line-height: 1.8;
  margin-bottom: 32px;
  font-weight: 300;
}

.modal-actions {
  display: flex;
  gap: 12px;
}

.modal-actions .btn {
  padding: 14px 24px;
  font-size: 14px;
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 768px) {
  :root {
    --section-padding: 64px;
  }

  .navbar-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-light);
    flex-direction: column;
    padding: 24px;
    gap: 20px;
    box-shadow: var(--shadow-lg);
  }

  .navbar-links.open {
    display: flex;
  }

  .menu-toggle {
    display: flex;
  }

  .hero {
    min-height: 85vh;
    padding: 100px 20px 60px;
  }

  .hero-signature {
    font-size: 42px;
  }

  .books-section-inner {
    padding: 40px 20px;
    border-radius: 16px;
  }

  .books-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .book-card-actions {
    flex-direction: column;
  }

  .scroll-indicator {
    display: none;
  }

  .category-tabs {
    gap: 4px;
  }

  .tab-btn {
    padding: 8px 18px;
    font-size: 11px;
    letter-spacing: 1px;
  }

  /* Modal responsive */
  .modal-grid {
    grid-template-columns: 1fr;
  }

  .modal-cover {
    border-radius: 20px 20px 0 0;
    min-height: 240px;
    max-height: 300px;
  }

  .modal-info {
    padding: 28px 24px;
  }

  .modal-info h2 {
    font-size: 22px;
  }

  .modal-actions {
    flex-direction: column;
  }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .books-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .books-section-inner {
    padding: 48px 32px;
  }
}

/* ============================================
   ADMIN PANEL STYLES
   (Separate light theme for admin area)
   ============================================ */

/* --- Admin CSS Custom Properties Override --- */
.login-page,
.admin-layout {
  --bg-primary: #FAFAFA;
  --bg-secondary: #F1F5F9;
  --bg-card: #FFFFFF;
  --bg-purple-light: #F5F3FF;
  --bg-rose-light: #FFF1F2;
  --bg-hero-gradient: linear-gradient(135deg, #F5F3FF 0%, #FAFAFA 50%, #FFF1F2 100%);

  --color-primary: #7C3AED;
  --color-primary-hover: #6D28D9;
  --color-primary-light: #A78BFA;
  --color-secondary: #EC4899;

  --text-primary: #1E293B;
  --text-secondary: #64748B;
  --text-tertiary: #94A3B8;
  --text-white: #FFFFFF;

  --border-light: #E2E8F0;
  --border-purple: rgba(124, 58, 237, 0.2);

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.04), 0 2px 4px rgba(0,0,0,0.03);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.06), 0 4px 10px rgba(0,0,0,0.04);
  --shadow-xl: 0 20px 40px rgba(0,0,0,0.08), 0 8px 16px rgba(0,0,0,0.04);
  --shadow-purple: 0 10px 30px rgba(124, 58, 237, 0.15);
  --shadow-purple-lg: 0 20px 50px rgba(124, 58, 237, 0.2);
}

/* --- Login Page --- */
.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-hero-gradient);
  padding: 24px;
}

.login-card {
  background: var(--bg-card);
  border-radius: 20px;
  padding: 48px 40px;
  width: 100%;
  max-width: 420px;
  box-shadow: var(--shadow-xl);
  text-align: center;
  border: 1px solid var(--border-light);
}

.login-card .brand-icon {
  font-size: 48px;
  margin-bottom: 8px;
}

.login-card h1 {
  font-family: var(--font-display);
  font-size: 24px;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.login-card .login-subtitle {
  color: var(--text-secondary);
  font-size: 14px;
  margin-bottom: 32px;
}

.login-card .form-group {
  margin-bottom: 16px;
  text-align: left;
}

.login-card label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.login-card input {
  width: 100%;
  padding: 12px 16px;
  border: 1.5px solid var(--border-light);
  border-radius: 10px;
  font-size: 15px;
  font-family: var(--font-body);
  transition: var(--transition-fast);
  background: var(--bg-primary);
  color: var(--text-primary);
}

.login-card input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(124,58,237,0.1);
  outline: none;
}

.login-card .btn-login {
  width: 100%;
  padding: 14px;
  margin-top: 8px;
  background: var(--color-primary);
  color: var(--text-white);
  border-radius: var(--btn-radius);
  font-size: 15px;
  font-weight: 600;
  transition: var(--transition-base);
  box-shadow: var(--shadow-purple);
}

.login-card .btn-login:hover {
  background: var(--color-primary-hover);
  box-shadow: var(--shadow-purple-lg);
}

.login-error {
  background: #FEF2F2;
  color: #DC2626;
  padding: 10px 16px;
  border-radius: 8px;
  font-size: 13px;
  margin-bottom: 16px;
  border: 1px solid #FECACA;
}

/* --- Admin Layout --- */
.admin-layout {
  display: flex;
  min-height: 100vh;
}

/* Sidebar */
.admin-sidebar {
  width: 260px;
  background: var(--bg-card);
  border-right: 1px solid var(--border-light);
  display: flex;
  flex-direction: column;
  padding: 24px 0;
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 100;
}

.admin-sidebar .sidebar-brand {
  padding: 0 24px 24px;
  border-bottom: 1px solid var(--border-light);
  margin-bottom: 16px;
}

.admin-sidebar .sidebar-brand .brand-icon {
  font-size: 32px;
  margin-bottom: 4px;
}

.admin-sidebar .sidebar-brand h2 {
  font-family: var(--font-display);
  font-size: 18px;
  color: var(--text-primary);
}

.admin-sidebar .sidebar-brand p {
  font-size: 12px;
  color: var(--text-tertiary);
}

.sidebar-nav {
  flex: 1;
  padding: 0 12px;
}

.sidebar-nav a {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: var(--transition-fast);
  margin-bottom: 4px;
}

.sidebar-nav a:hover {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

.sidebar-nav a.active {
  background: var(--bg-purple-light);
  color: var(--color-primary);
  font-weight: 600;
}

.sidebar-nav a svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.sidebar-footer {
  padding: 16px 12px 0;
  border-top: 1px solid var(--border-light);
  margin-top: auto;
}

.sidebar-footer a {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 500;
  color: #DC2626;
  transition: var(--transition-fast);
}

.sidebar-footer a:hover {
  background: #FEF2F2;
}

.sidebar-footer a svg {
  width: 20px;
  height: 20px;
}

/* Main content */
.admin-main {
  flex: 1;
  margin-left: 260px;
  background: var(--bg-secondary);
  min-height: 100vh;
}

.admin-topbar {
  background: var(--bg-card);
  border-bottom: 1px solid var(--border-light);
  padding: 20px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.admin-topbar h1 {
  font-family: var(--font-display);
  font-size: 22px;
  color: var(--text-primary);
}

.btn-add {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--color-primary);
  color: var(--text-white);
  padding: 10px 20px;
  border-radius: var(--btn-radius);
  font-size: 14px;
  font-weight: 600;
  transition: var(--transition-base);
  box-shadow: var(--shadow-purple);
}

.btn-add:hover {
  background: var(--color-primary-hover);
  box-shadow: var(--shadow-purple-lg);
  transform: translateY(-1px);
}

.btn-add svg {
  width: 18px;
  height: 18px;
}

.admin-content {
  padding: 32px;
}

/* --- Books Table --- */
.books-table-wrapper {
  background: var(--bg-card);
  border-radius: var(--card-radius);
  border: 1px solid var(--border-light);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.books-table {
  width: 100%;
  border-collapse: collapse;
}

.books-table thead {
  background: var(--bg-secondary);
}

.books-table th {
  padding: 14px 20px;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  text-align: left;
  border-bottom: 1px solid var(--border-light);
}

.books-table td {
  padding: 16px 20px;
  font-size: 14px;
  color: var(--text-primary);
  border-bottom: 1px solid var(--border-light);
  vertical-align: middle;
}

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

.books-table tbody tr {
  transition: var(--transition-fast);
}

.books-table tbody tr:hover {
  background: var(--bg-purple-light);
}

.table-cover {
  width: 48px;
  height: 64px;
  border-radius: 6px;
  object-fit: cover;
  background: var(--bg-secondary);
}

.table-title {
  font-weight: 600;
  color: var(--text-primary);
}

.table-author {
  font-size: 13px;
  color: var(--text-secondary);
}

.table-date {
  font-size: 13px;
  color: var(--text-tertiary);
}

.table-actions {
  display: flex;
  gap: 8px;
}

.btn-icon {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-fast);
  background: transparent;
}

.btn-icon svg {
  width: 18px;
  height: 18px;
}

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

.btn-edit:hover {
  background: var(--bg-purple-light);
}

.btn-delete {
  color: #DC2626;
}

.btn-delete:hover {
  background: #FEF2F2;
}

/* --- Admin Modal --- */
.admin-modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.5);
  backdrop-filter: blur(8px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition-base);
}

.admin-modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.admin-modal {
  background: var(--bg-card);
  border-radius: 20px;
  max-width: 560px;
  width: 100%;
  max-height: 85vh;
  overflow-y: auto;
  box-shadow: var(--shadow-xl);
  transform: translateY(20px) scale(0.97);
  transition: var(--transition-base);
}

.admin-modal-overlay.active .admin-modal {
  transform: translateY(0) scale(1);
}

.admin-modal-header {
  padding: 24px 28px;
  border-bottom: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.admin-modal-header h2 {
  font-family: var(--font-display);
  font-size: 20px;
  color: var(--text-primary);
}

.admin-modal-body {
  padding: 28px;
}

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

.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px 16px;
  border: 1.5px solid var(--border-light);
  border-radius: 10px;
  font-size: 14px;
  font-family: var(--font-body);
  transition: var(--transition-fast);
  background: var(--bg-primary);
  color: var(--text-primary);
  resize: vertical;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(124,58,237,0.1);
  outline: none;
}

.form-group textarea {
  min-height: 100px;
}

/* File upload area */
.file-upload {
  border: 2px dashed var(--border-purple);
  border-radius: 12px;
  padding: 24px;
  text-align: center;
  background: var(--bg-purple-light);
  transition: var(--transition-fast);
  cursor: pointer;
  position: relative;
}

.file-upload:hover {
  border-color: var(--color-primary);
  background: rgba(124,58,237,0.08);
}

.file-upload input[type="file"] {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

.file-upload svg {
  width: 32px;
  height: 32px;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.file-upload .upload-text {
  font-size: 14px;
  color: var(--text-secondary);
}

.file-upload .upload-text strong {
  color: var(--color-primary);
}

.file-upload .upload-hint {
  font-size: 12px;
  color: var(--text-tertiary);
  margin-top: 4px;
}

.file-upload .file-name {
  font-size: 13px;
  color: var(--color-primary);
  font-weight: 600;
  margin-top: 8px;
}

.admin-modal-footer {
  padding: 20px 28px;
  border-top: 1px solid var(--border-light);
  display: flex;
  justify-content: flex-end;
  gap: 12px;
}

.btn-cancel {
  padding: 10px 24px;
  border-radius: var(--btn-radius);
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--bg-secondary);
  transition: var(--transition-fast);
}

.btn-cancel:hover {
  background: var(--border-light);
}

.btn-save {
  padding: 10px 24px;
  border-radius: var(--btn-radius);
  font-size: 14px;
  font-weight: 600;
  color: var(--text-white);
  background: var(--color-primary);
  transition: var(--transition-base);
  box-shadow: var(--shadow-purple);
}

.btn-save:hover {
  background: var(--color-primary-hover);
  box-shadow: var(--shadow-purple-lg);
}

/* --- Toast Notification --- */
.toast-container {
  position: fixed;
  top: 24px;
  right: 24px;
  z-index: 3000;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toast {
  background: var(--bg-card);
  border-radius: 12px;
  padding: 14px 20px;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 280px;
  animation: slideIn 0.3s ease, fadeOut 0.3s ease 2.7s forwards;
}

.toast.success {
  border-left: 3px solid #10B981;
}

.toast.error {
  border-left: 3px solid #DC2626;
}

.toast-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.toast.success .toast-icon {
  color: #10B981;
}

.toast.error .toast-icon {
  color: #DC2626;
}

.toast-message {
  font-size: 14px;
  color: var(--text-primary);
  font-weight: 500;
}

@keyframes slideIn {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

@keyframes fadeOut {
  from { opacity: 1; }
  to { opacity: 0; }
}

/* --- Empty State --- */
.empty-state {
  text-align: center;
  padding: 60px 24px;
}

.empty-state svg {
  width: 64px;
  height: 64px;
  color: var(--text-tertiary);
  margin-bottom: 16px;
}

.empty-state h3 {
  font-size: 18px;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.empty-state p {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

/* --- Admin Responsive --- */
@media (max-width: 768px) {
  .admin-sidebar {
    transform: translateX(-100%);
    transition: var(--transition-base);
  }

  .admin-sidebar.open {
    transform: translateX(0);
  }

  .admin-main {
    margin-left: 0;
  }

  .admin-topbar {
    padding: 16px 20px;
  }

  .admin-content {
    padding: 20px;
  }

  .books-table th:nth-child(4),
  .books-table td:nth-child(4) {
    display: none;
  }
}

/* --- Confirm Dialog --- */
.confirm-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.5);
  backdrop-filter: blur(8px);
  z-index: 3000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition-base);
}

.confirm-overlay.active {
  opacity: 1;
  visibility: visible;
}

.confirm-dialog {
  background: var(--bg-card);
  border-radius: 16px;
  padding: 32px;
  max-width: 400px;
  width: 100%;
  text-align: center;
  box-shadow: var(--shadow-xl);
}

.confirm-dialog .confirm-icon {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: #FEF2F2;
  color: #DC2626;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
}

.confirm-dialog .confirm-icon svg {
  width: 24px;
  height: 24px;
}

.confirm-dialog h3 {
  font-size: 18px;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.confirm-dialog p {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.confirm-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
}

.btn-confirm-delete {
  padding: 10px 24px;
  border-radius: var(--btn-radius);
  font-size: 14px;
  font-weight: 600;
  color: var(--text-white);
  background: #DC2626;
  transition: var(--transition-fast);
}

.btn-confirm-delete:hover {
  background: #B91C1C;
}

/* --- Settings View (Admin) --- */
.settings-view {
  max-width: 640px;
}

.settings-card {
  background: var(--bg-card);
  border-radius: var(--card-radius);
  border: 1px solid var(--border-light);
  padding: 32px;
  box-shadow: var(--shadow-sm);
}

.settings-card h3 {
  font-family: var(--font-display);
  font-size: 18px;
  color: var(--text-primary);
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-light);
}

.settings-card .btn-save {
  margin-top: 8px;
}

.author-image-preview {
  width: 120px;
  height: 120px;
  border-radius: 12px;
  object-fit: cover;
  background: var(--bg-secondary);
  border: 1px solid var(--border-light);
  margin-bottom: 12px;
}