/* ============================================================
   AISEC CONFERENCE — Centralized Design System
   Matches aisec26 main website aesthetic
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Share+Tech+Mono&family=Syne:wght@400;600;700;800&family=DM+Sans:wght@300;400;500&display=swap');

/* ── Variables ── */
:root {
  --bg:        #0d1b2e;
  --bg2:       #0a1525;
  --surface:   #142035;
  --surface2:  #1a2d4a;
  --border:    rgba(122,184,255,.15);
  --border2:   rgba(122,184,255,.25);

  --cyan:      #1e7fe8;
  --cyan2:     #0057b8;
  --accent:    #7ab8ff;
  --green:     #4fffb0;
  --red:       #ff4060;
  --purple:    #8b5cf6;

  --text:      #e8f1fc;
  --text2:     #b0c8e8;
  --muted:     #7a9aba;

  --font-mono:    'Share Tech Mono', monospace;
  --font-display: 'Syne', sans-serif;
  --font-body:    'DM Sans', sans-serif;

  --nav-h: 68px;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; overflow-x: hidden; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.75;
  overflow-x: hidden;
}
body::before {
  content: '';
  position: fixed; inset: 0;
  background-image:
    linear-gradient(rgba(122,184,255,.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(122,184,255,.03) 1px, transparent 1px);
  background-size: 55px 55px;
  pointer-events: none; z-index: 0;
}
a { color: var(--accent); text-decoration: none; transition: color .2s; }
a:hover { color: #fff; }
ul, ol { list-style: none; }
img { max-width: 100%; height: auto; }

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: var(--bg2); }
::-webkit-scrollbar-thumb { background: var(--cyan2); border-radius: 2px; }

/* ============================================================
   NAV
   ============================================================ */
#conf-nav {
  position: fixed; top: 0; left: 0; right: 0;
  height: var(--nav-h);
  z-index: 1000;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 2rem;
  background: transparent;
  transition: background .3s, box-shadow .3s;
}
#conf-nav.scrolled {
  background: rgba(10,21,37,.95);
  backdrop-filter: blur(16px);
  box-shadow: 0 2px 20px rgba(0,0,0,.3);
  border-bottom: 1px solid var(--border);
}
.nav-logo img { height: 50px; width: auto; object-fit: contain; filter: drop-shadow(0 0 10px rgba(122,184,255,.35)); }
.nav-links { display: flex; align-items: center; gap: .15rem; list-style: none; }
.nav-links a {
  font-family: var(--font-mono);
  font-size: .68rem;
  color: rgba(232,241,252,.7);
  text-decoration: none;
  padding: .4rem .7rem;
  border-radius: 4px;
  letter-spacing: 1px;
  text-transform: uppercase;
  transition: all .2s;
  border: 1px solid transparent;
}
.nav-links a:hover, .nav-links a.active {
  color: var(--accent);
  border-color: var(--border);
  background: rgba(122,184,255,.06);
}
.nav-hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 5px; }
.nav-hamburger span { display: block; width: 22px; height: 2px; background: var(--accent); border-radius: 2px; }
.nav-mobile {
  position: fixed; top: var(--nav-h); left: 0; right: 0;
  background: rgba(10,21,37,.97);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 1rem 2rem 2rem;
  z-index: 999;
  display: none; flex-direction: column; gap: .25rem;
}
.nav-mobile.open { display: flex; }
.nav-mobile a {
  font-family: var(--font-mono); font-size: .75rem;
  color: var(--muted); text-decoration: none;
  padding: .7rem 0; border-bottom: 1px solid var(--border);
  letter-spacing: 1.5px; text-transform: uppercase;
  transition: color .2s;
}
.nav-mobile a:hover { color: var(--accent); }

/* ============================================================
   PAGE HERO (for inner pages)
   ============================================================ */
.page-hero {
  position: relative;
  padding: calc(var(--nav-h) + 3.5rem) 2rem 3.5rem;
  background: linear-gradient(135deg, rgba(6,14,36,.98), rgba(10,25,55,.9));
  overflow: hidden;
  border-bottom: 1px solid var(--border);
}
.page-hero::before {
  content: '';
  position: absolute; inset: 0;
  background: radial-gradient(ellipse 70% 60% at 80% 50%, rgba(0,87,184,.18), transparent 70%);
  pointer-events: none;
}
.page-hero-inner {
  position: relative; z-index: 1;
  max-width: 1200px; margin: 0 auto;
}
.page-tag {
  font-family: var(--font-mono);
  font-size: .65rem; letter-spacing: 3px;
  color: var(--accent); text-transform: uppercase;
  margin-bottom: .75rem;
  display: flex; align-items: center; gap: .5rem;
}
.page-tag::before { content: '//'; opacity: .4; }
.page-title {
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 4vw, 3rem);
  font-weight: 800; line-height: 1.1;
  letter-spacing: -.5px;
  color: var(--text);
}
.page-title span { color: var(--accent); }
.page-subtitle {
  font-size: .95rem; color: var(--muted);
  margin-top: .75rem; max-width: 600px;
  line-height: 1.75;
}
.scan-line {
  position: absolute; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg, transparent, rgba(122,184,255,.35), transparent);
  opacity: .3; animation: scan 7s linear infinite; pointer-events: none;
}
@keyframes scan { 0% { top: 0 } 100% { top: 100% } }

/* ============================================================
   MAIN HERO (index only)
   ============================================================ */
#hero {
  position: relative; min-height: 100vh;
  display: flex; align-items: center;
  padding: 0 2rem; overflow: hidden;
  background: var(--bg2);
}
.hero-bg-img {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  object-fit: cover; z-index: 0;
  animation: hero-zoom 20s ease-in-out infinite alternate;
}
@keyframes hero-zoom { from { transform: scale(1.02); } to { transform: scale(1.09); } }
.hero-overlay {
  position: absolute; inset: 0; z-index: 1;
  background:
    linear-gradient(135deg, rgba(6,14,36,.93) 0%, rgba(6,14,36,.72) 55%, rgba(6,14,36,.5) 100%),
    radial-gradient(ellipse 65% 80% at 75% 50%, rgba(0,70,160,.28), transparent 70%);
}
.hero-overlay::after {
  content: '';
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(122,184,255,.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(122,184,255,.03) 1px, transparent 1px);
  background-size: 52px 52px;
  animation: grid-drift 18s linear infinite;
}
@keyframes grid-drift { from { background-position: 0 0; } to { background-position: 52px 52px; } }
.hero-content {
  position: relative; z-index: 2;
  max-width: 1200px; margin: 0 auto; width: 100%;
  padding: 110px 0 70px;
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 4rem; align-items: center;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: .5rem;
  font-family: var(--font-mono); font-size: .64rem;
  letter-spacing: 2px; text-transform: uppercase;
  color: var(--accent);
  background: rgba(122,184,255,.08);
  border: 1px solid rgba(122,184,255,.25);
  border-radius: 100px;
  padding: .35rem 1rem;
  margin-bottom: 1.5rem;
}
.hero-badge .dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 6px var(--green);
  animation: pulse-dot 2s ease-in-out infinite;
}
@keyframes pulse-dot { 0%,100% { opacity:1; transform:scale(1); } 50% { opacity:.5; transform:scale(1.5); } }
.hero-logo { margin-bottom: 1.75rem; }
.hero-logo img {
  width: 280px; max-width: 100%; height: auto;
  filter: drop-shadow(0 0 28px rgba(122,184,255,.5));
  animation: logo-float 6s ease-in-out infinite;
}
@keyframes logo-float { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-7px); } }
.hero-meta {
  display: flex; gap: .9rem; flex-wrap: wrap;
  margin-bottom: 1.25rem; align-items: center;
}
.hero-meta-item {
  font-family: var(--font-mono); font-size: .9rem;
  color: rgba(180,210,255,.6);
  letter-spacing: 1.5px;
  display: flex; align-items: center; gap: .4rem;
}
.hero-meta-item::before {
  content: ''; width: 4px; height: 4px;
  border-radius: 50%; background: var(--accent); opacity: .5;
}
.hero-meta-item:first-child::before { display: none; }
.hero-subtitle { color: var(--muted); font-size: .97rem; line-height: 1.85; margin-bottom: 2.5rem; }
.hero-subtitle strong { color: var(--text); }
.hero-subtitle a { color: var(--accent); }
.hero-btns { display: flex; gap: .85rem; flex-wrap: wrap; align-items: center; }
.hero-stat-box {
  background: rgba(122,184,255,.04);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2rem;
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}
.hero-stat { text-align: center; }
.hero-stat .num {
  font-family: var(--font-display); font-size: 2.2rem; font-weight: 800;
  color: var(--text); display: block; line-height: 1;
  text-shadow: 0 0 20px rgba(122,184,255,.4);
}
.hero-stat .label {
  font-family: var(--font-mono); font-size: .6rem;
  color: var(--muted); letter-spacing: 2px;
  text-transform: uppercase; margin-top: .35rem;
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn-primary {
  display: inline-flex; align-items: center; gap: .5rem;
  background: linear-gradient(135deg, #0057b8, #003d8a);
  color: #fff;
  padding: .8rem 2rem;
  font-family: var(--font-mono); font-size: .7rem; font-weight: bold;
  letter-spacing: 2px; text-transform: uppercase;
  border-radius: 5px;
  border: 1px solid rgba(122,184,255,.28);
  cursor: pointer; transition: all .25s;
  text-decoration: none;
  position: relative; overflow: hidden;
}
.btn-primary::before {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,.12), transparent);
  opacity: 0; transition: opacity .25s;
}
.btn-primary:hover::before { opacity: 1; }
.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 35px rgba(0,87,184,.45);
  color: #fff;
}
.btn-outline {
  display: inline-flex; align-items: center; gap: .5rem;
  background: transparent; color: var(--text);
  padding: .8rem 2rem;
  font-family: var(--font-mono); font-size: .7rem;
  letter-spacing: 2px; text-transform: uppercase;
  border-radius: 5px; border: 1px solid var(--border2);
  cursor: pointer; transition: all .25s; text-decoration: none;
}
.btn-outline:hover {
  border-color: var(--accent); color: var(--accent);
  background: rgba(122,184,255,.07);
  transform: translateY(-3px);
}
.btn-common {
  display: inline-flex; align-items: center; gap: .5rem;
  background: linear-gradient(135deg, #0057b8, #003d8a);
  color: #fff;
  padding: .75rem 1.8rem;
  font-family: var(--font-mono); font-size: .68rem; font-weight: bold;
  letter-spacing: 1.5px; text-transform: uppercase;
  border-radius: 5px; border: 1px solid rgba(122,184,255,.28);
  cursor: pointer; transition: all .25s; text-decoration: none;
}
.btn-common:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0,87,184,.4);
  color: #fff;
}

/* ============================================================
   SECTIONS
   ============================================================ */
.conf-section {
  position: relative; z-index: 1;
  padding: 5rem 2rem;
}
.conf-section.alt { background: var(--bg2); }
.conf-section.dark { background: var(--surface); }
.section-inner { max-width: 1200px; margin: 0 auto; }
.section-head { margin-bottom: 3rem; }
.section-tag {
  font-family: var(--font-mono); font-size: .65rem;
  color: var(--accent); letter-spacing: 3px;
  text-transform: uppercase; margin-bottom: .6rem;
  display: flex; align-items: center; gap: .5rem;
}
.section-tag::before { content: '//'; opacity: .4; }
.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 3vw, 2.4rem);
  font-weight: 800; line-height: 1.15;
  letter-spacing: -.4px; color: var(--text);
}
.section-title .hl { color: var(--accent); }
.section-title::before, .section-title::after { display: none; } /* reset main.css */
.section-divider {
  height: 2px; width: 50px;
  background: linear-gradient(90deg, var(--cyan), transparent);
  margin-top: .75rem;
}

/* ============================================================
   INFORMATION BAR
   ============================================================ */
.info-bar {
  background: var(--surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 1.75rem 2rem;
}
.info-bar-inner {
  max-width: 1200px; margin: 0 auto;
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}
.info-item {
  display: flex; align-items: center; gap: 1rem;
}
.info-item-icon {
  width: 44px; height: 44px; flex-shrink: 0;
  background: rgba(122,184,255,.08);
  border: 1px solid var(--border);
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.2rem; color: var(--accent);
}
.info-item-text b { display: block; font-family: var(--font-mono); font-size: .65rem; color: var(--accent); letter-spacing: 1.5px; text-transform: uppercase; margin-bottom: .2rem; }
.info-item-text span { font-size: .85rem; color: var(--muted); }

/* ============================================================
   ABOUT / TEXT SECTIONS
   ============================================================ */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 4rem; align-items: center; }
.about-img img { border-radius: 10px; box-shadow: 0 8px 40px rgba(0,0,0,.4); border: 1px solid var(--border); }
.about-text h2 {
  font-family: var(--font-display); font-size: 1.6rem; font-weight: 800;
  color: var(--text); margin-bottom: 1.25rem; line-height: 1.2;
}
.about-text h2::before, .about-text h2::after { display: none; }
.about-text p { color: var(--muted); font-size: .93rem; line-height: 1.85; margin-bottom: 1rem; }
.about-text a { color: var(--accent); }

/* ============================================================
   CALL FOR PAPERS / CONTENT CARDS
   ============================================================ */
.content-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 2.5rem;
  position: relative;
  overflow: hidden;
}
.content-card::before {
  content: '';
  position: absolute; top: 0; left: 0;
  width: 3px; height: 100%;
  background: linear-gradient(180deg, var(--cyan), var(--purple));
}
.content-card h3 {
  font-family: var(--font-display); font-size: 1.1rem; font-weight: 700;
  color: var(--text); margin-bottom: 1rem;
}
.content-card p, .content-card li { color: var(--muted); font-size: .9rem; line-height: 1.85; }
.content-card a { color: var(--accent); }
.content-card strong { color: var(--text); }

/* custom list bullets */
.conf-list { padding-left: 0; margin: .75rem 0; }
.conf-list li {
  position: relative;
  padding-left: 1.2rem;
  margin-bottom: .6rem;
  color: var(--muted);
  font-size: .9rem;
  line-height: 1.7;
}
.conf-list li::before {
  content: '›';
  position: absolute; left: 0;
  color: var(--accent); font-size: 1rem; line-height: 1.5;
}
.conf-list.nested { padding-left: 1.5rem; }
.conf-list.nested li::before { color: var(--muted); }
.date-red { color: #ff6080 !important; font-weight: 700; }

/* dates table */
.dates-grid {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 1.5rem; margin-top: 1.5rem;
}
.date-card {
  background: rgba(122,184,255,.04);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1.25rem 1.5rem;
}
.date-card h4 {
  font-family: var(--font-mono); font-size: .7rem;
  color: var(--accent); letter-spacing: 2px;
  text-transform: uppercase; margin-bottom: .75rem;
}
.date-card ul { padding: 0; }
.date-card li {
  display: flex; justify-content: space-between; align-items: baseline;
  padding: .35rem 0;
  border-bottom: 1px solid var(--border);
  font-size: .85rem; color: var(--muted);
  gap: 1rem;
}
.date-card li:last-child { border-bottom: none; }
.date-card li span { color: #ff6080; font-family: var(--font-mono); font-size: .8rem; white-space: nowrap; }

/* ============================================================
   SPEAKERS
   ============================================================ */
.speakers-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1.5rem;
}
.speaker-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  transition: all .3s;
}
.speaker-card:hover { border-color: rgba(122,184,255,.4); transform: translateY(-4px); box-shadow: 0 12px 40px rgba(0,0,0,.3); }
.speaker-img {
  position: relative; height: 240px; overflow: hidden;
}
.speaker-img img { width: 100%; height: 100%; object-fit: cover; transition: transform .35s; }
.speaker-card:hover .speaker-img img { transform: scale(1.06); }
.speaker-img-overlay {
  position: absolute; inset: 0;
  background:
    linear-gradient(to top, rgba(10,21,37,.92) 0%, rgba(10,21,37,.2) 55%, rgba(10,21,37,0) 100%),
    radial-gradient(80% 60% at 80% 20%, rgba(0,87,184,.35), transparent 60%);
}
.speaker-info { padding: 1rem 1.1rem 1.25rem; }
.speaker-name { font-family: var(--font-display); font-size: .95rem; font-weight: 800; color: var(--text); margin-bottom: .3rem; }
.speaker-role { font-family: var(--font-mono); font-size: .65rem; color: var(--muted); letter-spacing: 1px; text-transform: uppercase; }

/* ============================================================
   COMMITTEES
   ============================================================ */
.committee-section { margin-bottom: 2.5rem; }
.committee-label {
  font-family: var(--font-mono); font-size: .65rem;
  color: var(--accent); letter-spacing: 3px;
  text-transform: uppercase;
  padding-bottom: .6rem; margin-bottom: 1.25rem;
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center; gap: .75rem;
}
.committee-label::after { content: ''; flex: 1; height: 1px; background: var(--border); }
.committee-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: .75rem;
}
.committee-item {
  background: rgba(122,184,255,.04);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: .75rem 1rem;
  font-size: .87rem; color: var(--muted);
  transition: all .2s;
}
.committee-item:hover { border-color: var(--border2); color: var(--text); background: rgba(122,184,255,.07); }
.committee-item strong { color: var(--text); display: block; font-size: .88rem; }

/* ============================================================
   REGISTRATION TABLE
   ============================================================ */
.reg-table-wrap { overflow-x: auto; margin: 1.5rem 0; border-radius: 8px; border: 1px solid var(--border); }
.reg-table { width: 100%; border-collapse: collapse; }
.reg-table th {
  background: var(--surface2);
  font-family: var(--font-mono); font-size: .68rem;
  color: var(--accent); letter-spacing: 2px; text-transform: uppercase;
  padding: .85rem 1.25rem; text-align: left;
  border-bottom: 1px solid var(--border);
}
.reg-table td {
  padding: .8rem 1.25rem; font-size: .9rem;
  color: var(--muted); border-bottom: 1px solid var(--border);
}
.reg-table tr:last-child td { border-bottom: none; }
.reg-table tr:hover td { background: rgba(122,184,255,.04); color: var(--text); }
.reg-table td.price { font-family: var(--font-mono); color: var(--green); font-weight: 600; }

/* ============================================================
   VENUE
   ============================================================ */
.venue-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; }
.venue-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}
.venue-card img { width: 100%; height: 220px; object-fit: cover; display: block; }
.venue-card-body { padding: 1.25rem 1.5rem; }
.venue-card-body h3 { font-family: var(--font-display); font-size: 1rem; font-weight: 700; color: var(--text); margin-bottom: .5rem; }
.venue-card-body p { font-size: .87rem; color: var(--muted); line-height: 1.75; }
.venue-hero-img { width: 100%; height: 320px; object-fit: cover; border-radius: 10px; border: 1px solid var(--border); margin-bottom: 2rem; display: block; }

/* ============================================================
   TAGS
   ============================================================ */
.tag {
  display: inline-block;
  font-family: var(--font-mono); font-size: .62rem;
  padding: .28rem .65rem; border-radius: 3px;
  border: 1px solid; letter-spacing: 1px; text-transform: uppercase;
  margin: .2rem;
}
.tag-cyan { color: var(--accent); border-color: rgba(122,184,255,.3); background: rgba(122,184,255,.07); }
.tag-green { color: var(--green); border-color: rgba(79,255,176,.3); background: rgba(79,255,176,.06); }
.tag-red { color: var(--red); border-color: rgba(255,64,96,.3); background: rgba(255,64,96,.06); }
.tag-purple { color: #b49fff; border-color: rgba(180,159,255,.3); background: rgba(180,159,255,.06); }

/* ============================================================
   STATS STRIP
   ============================================================ */
.stats-strip {
  background: var(--surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 2rem;
}
.stats-inner {
  max-width: 1200px; margin: 0 auto;
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 2rem; text-align: center;
}
.stat-num { font-family: var(--font-display); font-size: 2.4rem; font-weight: 800; color: var(--text); display: block; }
.stat-label { font-family: var(--font-mono); font-size: .65rem; color: var(--muted); letter-spacing: 2px; text-transform: uppercase; }

/* ============================================================
   SCHEDULE TABS
   ============================================================ */
.schedule-tabs { display: flex; gap: 0; margin-bottom: 2rem; border-bottom: 1px solid var(--border); }
.schedule-tab-btn {
  font-family: var(--font-mono); font-size: .68rem; letter-spacing: 1.5px; text-transform: uppercase;
  padding: .75rem 1.5rem; background: transparent; border: none; cursor: pointer;
  color: var(--muted); border-bottom: 2px solid transparent; margin-bottom: -1px; transition: all .2s;
}
.schedule-tab-btn.active { color: var(--text); border-bottom-color: var(--accent); }
.schedule-tab-btn:hover { color: var(--text); }
.schedule-content { display: none; }
.schedule-content.active { display: block; }
.timeline { display: flex; flex-direction: column; gap: 1px; }
.timeline-item {
  display: grid; grid-template-columns: 150px 1fr;
  border: 1px solid var(--border); background: var(--surface);
  border-radius: 5px; overflow: hidden; margin-bottom: 1px;
  transition: all .2s;
}
.timeline-item:hover { border-color: var(--border2); background: var(--surface2); }
.timeline-time {
  background: rgba(122,184,255,.06); border-right: 1px solid var(--border);
  padding: 1rem; font-family: var(--font-mono); font-size: .78rem; color: var(--accent);
  display: flex; align-items: center; justify-content: center; text-align: center; letter-spacing: 1px;
}
.timeline-body { padding: .9rem 1.25rem; }
.timeline-body h4 { font-family: var(--font-display); font-size: .88rem; font-weight: 700; color: var(--text); margin-bottom: .2rem; }
.timeline-body p { color: var(--muted); font-size: .82rem; }

/* ============================================================
   FOOTER
   ============================================================ */
#conf-footer {
  background: var(--bg2);
  border-top: 1px solid var(--border);
  padding: 3rem 2rem 1.5rem;
  position: relative; z-index: 1;
}
.footer-inner {
  max-width: 1200px; margin: 0 auto;
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 3rem;
  margin-bottom: 2rem;
}
.footer-brand .logo {
  font-family: var(--font-display); font-size: 1.2rem; font-weight: 800;
  color: var(--text); margin-bottom: .6rem; letter-spacing: 1.5px;
}
.footer-brand .logo span { color: var(--accent); }
.footer-brand p { font-size: .83rem; color: var(--muted); line-height: 1.75; }
.footer-col h5 {
  font-family: var(--font-mono); font-size: .62rem;
  letter-spacing: 3px; text-transform: uppercase;
  color: var(--muted); margin-bottom: 1.1rem;
}
.footer-col a { display: block; font-size: .83rem; color: var(--muted); text-decoration: none; margin-bottom: .4rem; transition: color .2s; }
.footer-col a:hover { color: var(--text); }
.footer-bottom {
  max-width: 1200px; margin: 0 auto;
  padding-top: 1.25rem; border-top: 1px solid var(--border);
  display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 1rem;
}
.footer-bottom p { font-family: var(--font-mono); font-size: .62rem; color: var(--muted); letter-spacing: 1px; }
.footer-bottom span { color: var(--accent); }

/* ============================================================
   PRELOADER
   ============================================================ */
#preloader {
  position: fixed; inset: 0; background: var(--bg2);
  display: flex; align-items: center; justify-content: center;
  z-index: 9999; transition: opacity .4s;
}
#preloader.hidden { opacity: 0; pointer-events: none; }
.preloader-ring {
  width: 50px; height: 50px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin-ring .8s linear infinite;
}
@keyframes spin-ring { to { transform: rotate(360deg); } }

/* back to top */
.back-to-top {
  position: fixed; bottom: 2rem; right: 2rem;
  width: 40px; height: 40px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  color: var(--accent); text-decoration: none;
  transition: all .2s; z-index: 500;
  opacity: 0; pointer-events: none;
}
.back-to-top.visible { opacity: 1; pointer-events: all; }
.back-to-top:hover { background: var(--surface2); color: var(--text); transform: translateY(-3px); }

/* ============================================================
   FADE-IN ANIMATION
   ============================================================ */
.fade-in {
  opacity: 0; transform: translateY(20px);
  transition: opacity .55s ease, transform .55s ease;
}
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media(max-width: 1024px) {
  .about-grid { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .hero-content { grid-template-columns: 1fr; padding: 100px 0 60px; }
  .venue-grid { grid-template-columns: 1fr; }
  .dates-grid { grid-template-columns: 1fr; }
}
@media(max-width: 768px) {
  .nav-links { display: none; }
  .nav-hamburger { display: flex; }
  .info-bar-inner { grid-template-columns: 1fr 1fr; }
  .stats-inner { grid-template-columns: 1fr 1fr; }
  .speakers-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-inner { grid-template-columns: 1fr; gap: 2rem; }
  .committee-grid { grid-template-columns: 1fr; }
}
@media(max-width: 480px) {
  .info-bar-inner { grid-template-columns: 1fr; }
  .speakers-grid { grid-template-columns: 1fr; }
  .conf-section { padding: 3.5rem 1.25rem; }
}