/* ========================================
   Xiao Zhai - Personal Homepage
   Redesigned with refined aesthetics
   ======================================== */

/* CSS Custom Properties */
:root {
  /* Colors - Refined Gold Palette */
  --color-gold: #d4af37;
  --color-gold-light: #f4e5c2;
  --color-gold-dark: #c4a030;
  --color-gold-subtle: rgba(212, 175, 55, 0.2);
  
  /* Teal Accent */
  --color-teal: #3a7f8f;
  --color-teal-light: #4a9cae;
  
  /* Background Colors */
  --color-bg-dark: #1a1a1a;
  --color-bg-medium: #2d2d2d;
  --color-bg-light: #3a3a3a;
  --color-bg-card: rgba(45, 45, 45, 0.6);
  --color-bg-pub: rgba(26, 26, 26, 0.6);
  
  /* Text Colors */
  --color-text-white: #ffffff;
  --color-text-light: #e0e0e0;
  --color-text-muted: #cccccc;
  --color-text-subtle: #999999;
  
  /* Typography */
  --font-serif: 'Playfair Display', Georgia, serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  
  /* Borders */
  --border-color: var(--color-gold-subtle);
  --border-radius: 12px;
  --border-radius-sm: 8px;
}

/* ========================================
   Base Styles
   ======================================== */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  padding: 20px;
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.6;
  color: var(--color-text-light);
  text-align: center;
  background: 
    /* Subtle light leakage effects - refined */
    radial-gradient(ellipse at 15% 20%, rgba(212, 175, 55, 0.06) 0%, transparent 25%),
    radial-gradient(ellipse at 85% 80%, rgba(58, 127, 143, 0.04) 0%, transparent 20%),
    radial-gradient(ellipse at 50% 5%, rgba(255, 255, 255, 0.02) 0%, transparent 15%),
    linear-gradient(135deg, var(--color-bg-dark) 0%, var(--color-bg-medium) 100%);
  background-attachment: fixed;
  min-height: 100vh;
}

/* Film grain texture overlay */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    radial-gradient(ellipse at 15% 20%, rgba(212, 175, 55, 0.06) 0%, transparent 25%),
    radial-gradient(ellipse at 85% 80%, rgba(58, 127, 143, 0.04) 0%, transparent 20%),
    radial-gradient(ellipse at 50% 5%, rgba(255, 255, 255, 0.02) 0%, transparent 15%);
  pointer-events: none;
  z-index: -1;
}

/* ========================================
   Typography
   ======================================== */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  margin-top: 0;
  margin-bottom: var(--spacing-sm);
  font-weight: 700;
}

p {
  margin-top: 0;
  margin-bottom: var(--spacing-md);
  line-height: 1.7;
}

p.centered {
  max-width: none;
  margin-left: 0;
  margin-right: 0;
  text-align: center;
}

a {
  color: var(--color-teal);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--color-gold);
}

/* ========================================
   Layout
   ======================================== */

.container {
  max-width: 1100px;
  margin: 0 auto;
  text-align: left;
}

/* ========================================
   Hero Section
   ======================================== */

.hero {
  text-align: center;
  padding: var(--spacing-xl) 0;
  margin-bottom: var(--spacing-xl);
}

.hero img {
  width: 170px;
  height: 170px;
  border-radius: 50%;
  border: 3px solid var(--color-gold);
  margin-bottom: var(--spacing-lg);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.hero h1 {
  font-family: var(--font-serif);
  font-size: clamp(2.2rem, 5vw, 3rem);
  font-weight: 700;
  margin: 0 0 var(--spacing-none) 0;
  background: linear-gradient(135deg, var(--color-gold) 0%, var(--color-gold-light) 50%, var(--color-gold-dark) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: 0.02em;
}

.hero .subtitle {
  font-size: 1rem;
  text-align: center;
  color: var(--color-text-muted);
  font-weight: 400;
}

.hero .subtitle a {
  color: var(--color-teal);
  font-weight: 500;
}

.hero .subtitle a:hover {
  color: var(--color-gold);
}

.hero p {
  color: var(--color-text-muted);
  text-align: left;
  margin-bottom: var(--spacing-md);
  max-width: 70ch;
  margin-left: auto;
  margin-right: auto;
}

.hero .subtitle {
  font-size: 1rem;
  color: var(--color-text-muted);
  margin: 0 0 var(--spacing-lg) 0;
  font-weight: 700;
  text-align: center;
  max-width: none;
  margin-left: 0;
  margin-right: 0;
}

.hero .subtitle a {
  color: var(--color-teal);
  font-weight: 700;
}

.hero .subtitle a:hover {
  color: var(--color-gold);
}

/* ========================================
   Sections
   ======================================== */

.section {
  margin: var(--spacing-xl) 0;
  padding: var(--spacing-lg);
  background: var(--color-bg-card);
  border-radius: var(--border-radius);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--border-color);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.25);
}

.section h2 {
  font-family: var(--font-serif);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--color-gold);
  margin: 0 0 var(--spacing-lg) 0;
  text-align: center;
  letter-spacing: 0.01em;
}

/* ========================================
   Movie Posters Grid
   ======================================== */

.movies {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
  gap: 15px;
  margin: var(--spacing-md) 0;
  max-width: 100%;
}

/* Mobile 3-column grid */
@media (max-width: 768px) {
  .movies {
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
  }
  
  .movie {
    min-height: 120px;
  }
}

/* Small mobile */
@media (max-width: 480px) {
  .movies {
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
  }
  
  .movie {
    min-height: 100px;
  }
  
  .movie-title {
    font-size: 0.75rem;
  }
  
  .movie-year {
    font-size: 0.7rem;
  }
}

.movie {
  position: relative;
  background: var(--color-bg-light);
  border-radius: var(--border-radius-sm);
  overflow: hidden;
  aspect-ratio: 2/3;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
  cursor: pointer;
}

.movie:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.4);
}

.movie img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.movie-info {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.98) 0%, rgba(0, 0, 0, 0.85) 30%, rgba(0, 0, 0, 0.5) 60%, transparent 100%);
  color: var(--color-text-white);
  padding: 18px 15px 15px;
  opacity: 0;
  transition: opacity 0.25s ease, transform 0.25s ease;
}

.movie:hover .movie-info {
  opacity: 1;
}

.movie-link {
  text-decoration: none;
  color: inherit;
  display: block;
}

.movie-link:hover {
  text-decoration: none;
  color: inherit;
}

.movie-title {
  font-family: var(--font-serif);
  font-size: 0.85rem;
  font-weight: 600;
  margin: 0 0 4px 0;
  line-height: 1.3;
}

.movie-year {
  font-size: 0.75rem;
  color: var(--color-gold);
  margin: 0;
}

/* ========================================
   Publications
   ======================================== */

.pub {
  margin: var(--spacing-sm) 0;
  padding: var(--spacing-xs) var(--spacing-sm);
  background: var(--color-bg-pub);
  border-radius: var(--border-radius-sm);
  border-left: 3px solid var(--color-gold);
}

.pub-title {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  color: var(--color-gold-light);
  margin: var(--spacing-xs) 0 var(--spacing-xs) 0;
  font-weight: 600;
  line-height: 1.4;
}

.pub-authors {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  margin: 0 0 var(--spacing-xs) 0;
  line-height: 1.5;
}

.pub strong {
  color: var(--color-gold);
  font-weight: 600;
}

.pub-venue {
  color: var(--color-text-subtle);
  font-size: 0.85rem;
  font-style: italic;
  margin: 0 0 var(--spacing-xs) 0;
}

.pub-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  margin: var(--spacing-xs) 0;
}

.pub-links a {
  display: inline-block;
  padding: 4px 12px;
  background: rgba(212, 175, 55, 0.1);
  border-radius: 4px;
  font-size: 0.8rem;
  color: var(--color-teal);
  transition: all 0.2s ease;
}

.pub-links a:hover {
  background: rgba(212, 175, 55, 0.2);
  color: var(--color-gold);
}

/* ========================================
   Contact / Footer
   ======================================== */

.contact {
  text-align: center;
  margin: var(--spacing-xl) 0;
  padding: var(--spacing-lg);
  color: var(--color-text-subtle);
  font-size: 0.95rem;
}

.contact a {
  color: var(--color-teal);
  font-weight: 500;
}

.contact a:hover {
  color: var(--color-gold);
}

/* ========================================
   Animations
   ======================================== */

.fade {
  animation: fadeIn 0.6s ease forwards;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ========================================
   Responsive Adjustments
   ======================================== */

@media (max-width: 768px) {
  body {
    padding: 15px;
    font-size: 14px;
  }
  
  .hero {
    padding: var(--spacing-lg) var(--spacing-sm);
  }
  
  .hero img {
    width: 150px;
    height: 150px;
  }
  
  .section {
    padding: var(--spacing-md);
    margin: var(--spacing-md) 0;
  }
  
  .section h2 {
    font-size: 1.4rem;
  }
  
  .pub {
    padding: var(--spacing-sm);
  }
  
  .pub-title {
    font-size: 0.95rem;
  }
  
  .pub-authors {
    font-size: 0.85rem;
  }
}

@media (max-width: 480px) {
  body {
    padding: 12px;
    font-size: 13px;
  }
  
  .hero img {
    width: 130px;
    height: 130px;
  }
  
  .hero h1 {
    font-size: 1.8rem;
  }
  
  .section {
    padding: var(--spacing-sm);
    border-radius: 8px;
  }
}

/* ========================================
   Accessibility
   ======================================== */

/* Focus states */
a:focus,
.movie-link:focus {
  outline: 2px solid var(--color-gold);
  outline-offset: 2px;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  :root {
    --color-gold: #ffd700;
    --color-teal: #00bcd4;
    --color-text-muted: #ffffff;
  }
}