/* ==========================================================================
   SOPHIA CODEX - PROFESSIONAL SCHOLAR DESIGN SYSTEM
   Font chuẩn: Be Vietnam Pro (Giao diện) + Merriweather & Lora (Đọc văn bản)
   Phong cách Viện Hàn Lâm & Thư Viện Hoàng Gia Hiện Đại
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Be+Vietnam+Pro:ital,wght@0,300;0,400;0,500;0,600;0,700;0,800;1,400;1,500&family=Cinzel:wght@600;700;800&family=Inter:wght@400;500;600;700&family=Lora:ital,wght@0,400;0,500;0,600;1,400;1,500&family=Merriweather:ital,wght@0,300;0,400;0,700;1,300;1,400&family=Playfair+Display:ital,wght@0,600;0,700;1,400&display=swap');

:root {
  /* Master Fonts */
  --font-ui: 'Be Vietnam Pro', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-display: 'Playfair Display', Georgia, serif;
  --font-heading: 'Be Vietnam Pro', Georgia, serif;
  --font-reading: 'Lora', Georgia, 'Times New Roman', serif;
  --font-serif: 'Lora', Georgia, serif;

  /* Refined Luxury Academic Color Palette */
  --bg-parchment: #F8F5EE;
  --bg-parchment-soft: #F1ECE0;
  --bg-surface: #FFFFFF;
  --bg-card: #FFFFFF;
  --border-parchment: #E4D9C0;
  --border-gold: #C59B4B;

  --text-main: #181E1A;
  --text-muted: #4F5A54;
  --text-light: #7A8780;

  --scholar-navy: #0A1128;
  --scholar-green: #064E3B;
  --scholar-green-dark: #022C22;
  --scholar-green-light: #065F46;

  --gold-accent: #D97706;
  --gold-vivid: #F59E0B;
  --gold-light: #FEF3C7;
  --gold-glow: rgba(217, 119, 6, 0.35);

  --shadow-sm: 0 2px 8px rgba(10, 17, 40, 0.05);
  --shadow-md: 0 8px 24px rgba(10, 17, 40, 0.08);
  --shadow-lg: 0 16px 40px rgba(10, 17, 40, 0.12);
  --shadow-book: -8px 12px 28px rgba(10, 17, 40, 0.28), 0 3px 8px rgba(0,0,0,0.15);
}

/* Base Reset & Standalone Rules (Fallback if CDN is offline) */
* {
  box-sizing: border-box;
}

img, svg {
  max-width: 100%;
  height: auto;
}

body {
  font-family: var(--font-ui);
  background-color: var(--bg-parchment);
  color: var(--text-main);
  margin: 0;
  padding: 0;
  transition: background-color 0.3s ease, color 0.3s ease;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
}

.font-ui { font-family: var(--font-ui); }
.font-display { font-family: var(--font-display); }
.font-heading { font-family: var(--font-heading); }
.font-reading { font-family: var(--font-reading); }
.font-serif { font-family: var(--font-serif); }

/* Standalone Card & Form Rules */
.auth-container {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  background-color: var(--bg-parchment);
  position: relative;
}

.auth-card {
  max-width: 450px;
  width: 100%;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-parchment);
  border-radius: 1.25rem;
  padding: 2.25rem;
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow: hidden;
}

.auth-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--scholar-green-dark), var(--gold-accent), var(--scholar-green-dark));
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 0.375rem;
}

.form-input {
  width: 100%;
  padding: 0.625rem 0.875rem 0.625rem 2.5rem;
  border: 1px solid var(--border-parchment);
  border-radius: 0.5rem;
  background-color: var(--bg-parchment-soft);
  color: var(--text-main);
  font-family: var(--font-ui);
  font-size: 0.875rem;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-input:focus {
  border-color: var(--scholar-green);
  box-shadow: 0 0 0 3px rgba(6, 78, 59, 0.15);
}

.btn-primary {
  width: 100%;
  padding: 0.75rem 1.25rem;
  background-color: var(--scholar-green-dark);
  color: #FEF3C7;
  border: 1px solid rgba(217, 119, 6, 0.4);
  border-radius: 0.5rem;
  font-weight: 600;
  font-size: 0.875rem;
  font-family: var(--font-ui);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  transition: all 0.2s;
  box-shadow: var(--shadow-sm);
}

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

.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.loading-spinner {
  border: 2px solid transparent;
  border-top-color: currentColor;
  border-radius: 50%;
  width: 1.15rem;
  height: 1.15rem;
  animation: spin 0.8s linear infinite;
  display: inline-block;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 7px;
  height: 7px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--border-parchment);
  border-radius: 9999px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--gold-accent);
}

/* Authentic 3D Book Covers */
.real-book-cover {
  position: relative;
  width: 100%;
  max-width: 240px;
  margin: 0 auto;
  aspect-ratio: 3 / 4.3;
  border-radius: 4px 14px 14px 4px;
  overflow: hidden;
  box-shadow: var(--shadow-book);
  transform-style: preserve-3d;
  transition: transform 0.45s cubic-bezier(0.165, 0.84, 0.44, 1), box-shadow 0.45s ease;
  background-color: #0E1611;
}

.real-book-cover img.book-art {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease, filter 0.5s ease;
  filter: contrast(1.08) brightness(0.92);
}

.real-book-cover::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  width: 20px;
  background: linear-gradient(to right, 
    rgba(0,0,0,0.55) 0%, 
    rgba(255,255,255,0.22) 20%, 
    rgba(0,0,0,0.3) 45%, 
    rgba(255,255,255,0.12) 70%, 
    rgba(0,0,0,0.35) 100%);
  border-radius: 4px 0 0 4px;
  z-index: 10;
  pointer-events: none;
}

.book-foil-frame {
  position: absolute;
  inset: 10px;
  border: 1px solid rgba(223, 180, 105, 0.65);
  box-shadow: inset 0 0 14px rgba(0,0,0,0.5);
  pointer-events: none;
  z-index: 8;
  border-radius: 2px 10px 10px 2px;
}

.real-book-cover:hover {
  transform: translateY(-8px) rotateY(-5deg) scale(1.02);
  box-shadow: -14px 24px 42px rgba(14, 27, 21, 0.38);
}

/* Reader View Clearance: Chống thanh Audio Player Dock che khuất nội dung trang sách */
#view-reader {
  padding-bottom: 140px;
}