/* ============================================
   BANYAN | The Mind-Crafter — Styles
   Contemporary art museum aesthetic
   Dappled sunlight · Literary reviews
   ============================================ */

/* --- CSS Variables (Color Palette) --- */
:root {
  /* 顏色對調：墨綠↔深炭灰 */
  --clr-ink:      #1C1A17;  /* 深炭灰 */
  --clr-caramel:  #C87A53;  /* 焦糖/粘土色 */
  --clr-charcoal: #2C3E2B;  /* 墨綠 */
  --clr-paper:    #F5F0E8;  /* 暖白 (replaces cold white) */
  --clr-mist:     #E8E2D9;  /* 霧灰 */
  --clr-bark:     #6B5B4E;  /* 樹皮棕 */

  --font-serif-en: 'Cormorant Garamond', Georgia, serif;
  --font-serif-cn: 'Yu Gothic UI', 'Noto Serif TC', 'Songti SC', sans-serif;

  --space-xs:  0.5rem;
  --space-sm:  1rem;
  --space-md:  2rem;
  --space-lg:  4rem;
  --space-xl:  8rem;

  --transition: 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

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

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

body {
  font-family: var(--font-serif-cn);
  background-color: var(--clr-paper);
  color: var(--clr-charcoal);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

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

/* --- Floating Header --- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: var(--space-sm) var(--space-md);
  background: linear-gradient(
    to bottom,
    rgba(245, 240, 232, 0.92) 0%,
    rgba(245, 240, 232, 0) 100%
  );
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-serif-en);
  font-weight: 400;
  font-size: 0.95rem;
  letter-spacing: 0.15em;
  color: var(--clr-ink);
  text-transform: uppercase;
}

.brand-sep {
  opacity: 0.4;
}

.brand-cn {
  font-family: var(--font-serif-cn);
  letter-spacing: 0.08em;
  text-transform: none;
  font-weight: 300;
  font-size: 0.85rem;
  opacity: 0.85;
}

/* --- Hero Section --- */
.hero {
  position: relative;
  height: 100vh;
  min-height: 600px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
}

.hero-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    160deg,
    rgba(28, 26, 23, 0.55) 0%,
    rgba(44, 62, 43, 0.35) 50%,
    rgba(28, 26, 23, 0.6) 100%
  );
}

/* Dappled light sunbeam particles */
.hero-particles {
  position: absolute;
  inset: 0;
  background-image: 
    radial-gradient(ellipse 100px 250px at 50% 5%, rgba(255,248,220,0.12) 0%, transparent 70%),
    radial-gradient(ellipse 80px 200px at 30% 10%, rgba(255,248,220,0.10) 0%, transparent 70%),
    radial-gradient(ellipse 90px 220px at 70% 8%, rgba(255,248,220,0.11) 0%, transparent 70%),
    radial-gradient(ellipse 3px 3px at 18% 28%, rgba(255,250,230,0.35) 0%, transparent 100%),
    radial-gradient(ellipse 2px 4px at 38% 22%, rgba(255,250,230,0.30) 0%, transparent 100%),
    radial-gradient(ellipse 4px 2px at 55% 32%, rgba(255,250,230,0.32) 0%, transparent 100%),
    radial-gradient(ellipse 2px 3px at 72% 25%, rgba(255,250,230,0.28) 0%, transparent 100%),
    radial-gradient(ellipse 3px 3px at 28% 48%, rgba(255,250,230,0.25) 0%, transparent 100%),
    radial-gradient(ellipse 2px 2px at 62% 42%, rgba(255,250,230,0.29) 0%, transparent 100%),
    radial-gradient(ellipse 3px 4px at 82% 38%, rgba(255,250,230,0.22) 0%, transparent 100%),
    radial-gradient(ellipse 2px 3px at 22% 62%, rgba(255,250,230,0.24) 0%, transparent 100%),
    radial-gradient(ellipse 4px 2px at 52% 52%, rgba(255,250,230,0.20) 0%, transparent 100%),
    radial-gradient(ellipse 2px 2px at 78% 58%, rgba(255,250,230,0.26) 0%, transparent 100%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: var(--space-md);
  max-width: 680px;
}

.hero-tagline {
  font-family: var(--font-serif-cn);
  font-weight: 300;
  font-size: clamp(1.4rem, 4vw, 2rem);
  line-height: 1.9;
  color: var(--clr-paper);
  text-shadow: 0 2px 20px rgba(28, 26, 23, 0.4);
  margin-bottom: var(--space-lg);
  letter-spacing: 0.05em;
}

.hero-email {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-serif-en);
  font-size: 0.9rem;
  letter-spacing: 0.12em;
  color: var(--clr-caramel);
  padding: 0.75rem 1.5rem;
  border: 1px solid rgba(200, 122, 83, 0.5);
  border-radius: 2px;
  transition: var(--transition);
  background: rgba(28, 26, 23, 0.3);
  backdrop-filter: blur(4px);
}

.hero-email:hover {
  background: rgba(200, 122, 83, 0.2);
  border-color: var(--clr-caramel);
  color: var(--clr-paper);
}

/* --- Archive Section --- */
.archive {
  padding: var(--space-xl) var(--space-md);
  background: var(--clr-paper);
}

.archive-inner {
  max-width: 1200px;
  margin: 0 auto;
}

.archive-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--clr-mist);
}

.archive-title {
  font-family: var(--font-serif-en);
  font-weight: 300;
  font-size: clamp(1.8rem, 3vw, 2.5rem);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--clr-ink);
}

.archive-viewall {
  font-family: var(--font-serif-en);
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  color: var(--clr-caramel);
  transition: var(--transition);
}

.archive-viewall:hover {
  opacity: 0.7;
}

/* --- Card Grid (Masonry via CSS columns) --- */
.card-grid {
  column-count: 1;
  column-gap: var(--space-md);
}

.card {
  break-inside: avoid;
  margin-bottom: var(--space-md);
  background: #fff;
  border-radius: 3px;
  overflow: hidden;
  box-shadow: 0 4px 24px rgba(28, 26, 23, 0.06);
  transition: var(--transition);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(28, 26, 23, 0.1);
}

.card-img-wrap {
  overflow: hidden;
  aspect-ratio: 4 / 3;
}

.card-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}

.card:hover .card-img-wrap img {
  transform: scale(1.04);
}

.card-body {
  padding: var(--space-sm);
}

.card-tag {
  display: inline-block;
  font-family: var(--font-serif-en);
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--clr-caramel);
  margin-bottom: 0.4rem;
}

.card-title {
  font-family: var(--font-serif-cn);
  font-weight: 500;
  font-size: 1.25rem;
  color: var(--clr-ink);
  margin-bottom: 0.2rem;
  line-height: 1.4;
}

.card-author {
  font-family: var(--font-serif-en);
  font-size: 0.85rem;
  color: var(--clr-bark);
  margin-bottom: 0.6rem;
  font-style: italic;
}

.card-desc {
  font-family: var(--font-serif-cn);
  font-size: 0.9rem;
  font-weight: 300;
  color: var(--clr-charcoal);
  line-height: 1.75;
  opacity: 0.8;
}

/* --- Footer --- */
.site-footer {
  background: var(--clr-charcoal);
  padding: var(--space-lg) var(--space-md);
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  text-align: center;
}

.footer-brand {
  font-family: var(--font-serif-en);
  font-weight: 300;
  font-size: 1rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--clr-paper);
  margin-bottom: var(--space-xs);
}

.footer-copy {
  font-family: var(--font-serif-cn);
  font-size: 0.8rem;
  color: var(--clr-mist);
  opacity: 0.5;
}

/* --- Responsive: Tablet --- */
@media (min-width: 640px) {
  .card-grid {
    column-count: 2;
  }

  .hero-tagline {
    font-size: clamp(1.6rem, 4vw, 2.2rem);
  }
}

/* --- Responsive: Desktop --- */
@media (min-width: 1024px) {
  .card-grid {
    column-count: 3;
  }

  .site-header {
    padding: var(--space-sm) var(--space-lg);
  }

  .archive {
    padding: var(--space-xl) var(--space-lg);
  }

  .card-body {
    padding: var(--space-sm) var(--space-md);
  }

  .card-title {
    font-size: 1.35rem;
  }
}

/* --- Reduced Motion --- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}