/* ============================================
   CIST 2026 — Light Fog + Warm Elegance
   ============================================ */

:root {
  --bg-deep: #f6f3ee;
  --bg-surface: #edeae4;
  --bg-card: #ffffff;
  --bg-card-hover: #faf9f6;

  --accent: #a17628;
  --accent-hover: #b8882f;
  --accent-glow: rgba(161, 118, 40, 0.07);
  --accent-border: rgba(161, 118, 40, 0.18);

  --text-primary: #2c2a26;
  --text-secondary: #6e6a62;
  --text-muted: #a09b92;

  --fog-1: rgba(220, 215, 205, 0.4);
  --fog-2: rgba(210, 205, 195, 0.3);

  --font-display: 'Cormorant Garamond', Georgia, serif;
  --font-body: 'DM Sans', system-ui, sans-serif;

  --max-width: 960px;
  --nav-height: 64px;
}

/* ---- Reset & Base ---- */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-primary);
  background: var(--bg-deep);
  overflow-x: hidden;
}

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

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

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

/* ---- Fog Layers ---- */

.fog-layer {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
}

.fog-1 {
  background:
    radial-gradient(ellipse 80% 50% at 20% 40%, var(--fog-1), transparent),
    radial-gradient(ellipse 60% 40% at 80% 60%, var(--fog-2), transparent);
  animation: fogDrift1 25s ease-in-out infinite alternate;
}

.fog-2 {
  background:
    radial-gradient(ellipse 70% 45% at 60% 30%, var(--fog-2), transparent),
    radial-gradient(ellipse 50% 60% at 30% 70%, var(--fog-1), transparent);
  animation: fogDrift2 30s ease-in-out infinite alternate;
}

@keyframes fogDrift1 {
  0%   { transform: translate(0, 0) scale(1); opacity: 0.6; }
  100% { transform: translate(40px, -20px) scale(1.05); opacity: 1; }
}

@keyframes fogDrift2 {
  0%   { transform: translate(0, 0) scale(1.05); opacity: 1; }
  100% { transform: translate(-30px, 15px) scale(1); opacity: 0.5; }
}

/* ---- Navigation ---- */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(246, 243, 238, 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.02em;
}

.nav-logo .year {
  color: var(--accent);
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 8px;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 500;
  padding: 6px 12px;
  border-radius: 6px;
  transition: color 0.2s, background 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-primary);
  background: rgba(0, 0, 0, 0.04);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-secondary);
  border-radius: 2px;
  transition: transform 0.2s;
}

/* ---- Hero (Home) ---- */

.hero {
  position: relative;
  min-height: 85vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: calc(var(--nav-height) + 40px) 24px 80px;
  overflow: hidden;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 50% at 50% 45%, rgba(161, 118, 40, 0.06), transparent 70%),
    radial-gradient(ellipse 80% 60% at 30% 80%, rgba(180, 175, 165, 0.1), transparent);
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 700px;
}

.hero-eyebrow {
  font-size: 0.8rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(3.5rem, 8vw, 6rem);
  font-weight: 700;
  line-height: 1;
  color: var(--text-primary);
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.hero-subtitle {
  font-family: var(--font-display);
  font-size: clamp(1.1rem, 2.5vw, 1.4rem);
  font-weight: 400;
  font-style: italic;
  color: var(--text-secondary);
  margin-bottom: 32px;
}

.hero-meta {
  display: flex;
  justify-content: center;
  gap: 28px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.hero-date, .hero-location {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-primary);
}

.hero-date svg, .hero-location svg {
  color: var(--accent);
  flex-shrink: 0;
}

.hero-venue {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 36px;
}

.btn-primary {
  display: inline-block;
  padding: 14px 36px;
  background: var(--accent);
  color: #ffffff;
  font-weight: 600;
  font-size: 0.9rem;
  letter-spacing: 0.03em;
  border-radius: 8px;
  transition: background 0.2s, transform 0.15s;
}

.btn-primary:hover {
  background: var(--accent-hover);
  color: #ffffff;
  transform: translateY(-1px);
}

/* ---- Announcements ---- */

.announcements {
  position: relative;
  z-index: 2;
  padding: 0 0 20px;
}

.announce-banner {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--accent-glow);
  border: 1px solid var(--accent-border);
  border-radius: 10px;
  padding: 16px 24px;
  font-size: 0.92rem;
  color: var(--text-primary);
}

.announce-icon {
  color: var(--accent);
  font-size: 1.1rem;
}

.announce-banner a {
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* ---- Key Dates Timeline ---- */

.key-dates {
  position: relative;
  z-index: 2;
  padding: 80px 0;
}

.section-title {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 40px;
  color: var(--text-primary);
}

.timeline {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.timeline-item {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 24px;
  padding: 18px 24px;
  border-radius: 8px;
  background: var(--bg-card);
  border-left: 3px solid transparent;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.03);
  transition: border-color 0.2s, background 0.2s;
}

.timeline-item:hover {
  border-left-color: var(--accent-border);
  background: var(--bg-card-hover);
}

.timeline-item.highlight {
  border-left-color: var(--accent);
  background: var(--bg-card);
}

.timeline-date {
  font-weight: 600;
  font-size: 0.92rem;
  color: var(--accent);
  white-space: nowrap;
}

.timeline-label {
  font-size: 0.95rem;
  color: var(--text-primary);
}

.timeline-note {
  color: var(--text-secondary);
  font-size: 0.82rem;
  font-weight: 400;
}

/* ---- Venue Preview ---- */

.venue-preview {
  position: relative;
  z-index: 2;
  padding: 0 0 100px;
}

.venue-card {
  background: var(--bg-card);
  border: 1px solid rgba(0, 0, 0, 0.06);
  border-radius: 12px;
  padding: 40px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

.venue-info h3 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.venue-info p {
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.venue-desc {
  margin-top: 16px;
  line-height: 1.6;
}

.link-arrow {
  display: inline-block;
  margin-top: 16px;
  font-weight: 600;
  font-size: 0.9rem;
}

/* ---- Page Hero (Inner pages) ---- */

.page-hero {
  position: relative;
  z-index: 2;
  padding: calc(var(--nav-height) + 60px) 0 40px;
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

.page-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-subtitle {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-top: 8px;
}

/* ---- Page Content ---- */

.page-content {
  position: relative;
  z-index: 2;
  padding: 48px 0 100px;
}

.content-body h2 {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 700;
  margin-top: 48px;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.content-body h2:first-child {
  margin-top: 0;
}

.content-body h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-top: 32px;
  margin-bottom: 12px;
}

.content-body p {
  margin-bottom: 16px;
  color: var(--text-secondary);
  line-height: 1.75;
}

.content-body ul, .content-body ol {
  margin-bottom: 16px;
  padding-left: 24px;
  color: var(--text-secondary);
}

.content-body li {
  margin-bottom: 8px;
  line-height: 1.65;
}

.content-body strong {
  color: var(--text-primary);
  font-weight: 600;
}

/* Tables */
.content-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 0.92rem;
}

.content-body th, .content-body td {
  padding: 14px 18px;
  text-align: left;
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

.content-body th {
  font-weight: 600;
  color: var(--text-primary);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  background: var(--bg-surface);
}

.content-body td {
  color: var(--text-secondary);
}

.content-body tr:hover td {
  background: var(--bg-card-hover);
}

/* ---- Committee Grid ---- */

.committee-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
  gap: 16px;
}

.committee-member {
  background: var(--bg-card);
  border: 1px solid rgba(0, 0, 0, 0.06);
  border-radius: 10px;
  padding: 24px;
  text-align: center;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.03);
  transition: border-color 0.2s, transform 0.15s;
}

.member-photo {
  width: 120px;
  height: 120px;
  margin: 0 auto 16px;
  border-radius: 50%;
  overflow: hidden;
  border: 3px solid var(--bg-surface);
}

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

.committee-member:hover {
  border-color: var(--accent-border);
  transform: translateY(-2px);
}

.committee-member h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 4px;
  color: var(--text-primary);
}

.committee-member .affiliation {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.committee-member .email {
  font-size: 0.82rem;
}

.committee-member .email a {
  color: var(--accent);
  font-weight: 400;
}

/* ---- Footer ---- */

.site-footer {
  position: relative;
  z-index: 2;
  border-top: 1px solid rgba(0, 0, 0, 0.06);
  padding: 48px 0 0;
  background: rgba(237, 234, 228, 0.6);
}

.footer-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px 36px;
  display: flex;
  justify-content: space-between;
  gap: 40px;
  flex-wrap: wrap;
}

.footer-logo {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-primary);
  display: block;
  margin-bottom: 8px;
}

.footer-brand p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 4px;
}

.footer-org {
  margin-top: 8px;
}

.footer-details {
  text-align: right;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.footer-details p {
  margin-bottom: 4px;
}

.footer-bottom {
  border-top: 1px solid rgba(0, 0, 0, 0.05);
  padding: 16px 24px;
  text-align: center;
}

.footer-bottom p {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* ---- Mobile ---- */

@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(246, 243, 238, 0.97);
    backdrop-filter: blur(12px);
    padding: 12px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
  }

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

  .nav-links a {
    padding: 12px 16px;
    font-size: 0.95rem;
  }

  .hero {
    min-height: 70vh;
    padding-top: calc(var(--nav-height) + 40px);
  }

  .hero-meta {
    flex-direction: column;
    gap: 12px;
    align-items: center;
  }

  .timeline-item {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .footer-container {
    flex-direction: column;
  }

  .footer-details {
    text-align: left;
  }

  .committee-grid {
    grid-template-columns: 1fr;
  }
}