/* ==========================================================
   SLAAI-ICAI 2025 — Orange / Yellow theme · Dark + Light mode
   Palette: #000000 · #161616 · #F7A34C · #EE7A00 · #D14E00
   ========================================================== */

:root {
  /* Brand (constant across themes) */
  --orange-light: #f7a34c;
  --orange: #ee7a00;
  --orange-deep: #d14e00;
  --yellow: #ffc24b;
  --on-grad: #1a0d00;
  --grad: linear-gradient(100deg, var(--yellow) 0%, var(--orange) 55%, var(--orange-deep) 100%);
  --radius: 18px;

  /* Dark theme (default) */
  --bg: #0c0c0c;
  --bg-2: #000000;
  --panel: #161616;
  --panel-2: #1e1c1a;
  --chip-bg: rgba(22, 22, 22, 0.8);
  --nav-glass: rgba(10, 8, 6, 0.82);
  --nav-solid: rgba(10, 8, 6, 0.97);
  --line: rgba(247, 163, 76, 0.14);
  --text: #f2ede7;
  --muted: #b3a89c;
  --shadow: 0 20px 50px rgba(0, 0, 0, 0.45);
  --glow: 0 0 40px rgba(238, 122, 0, 0.35);
  --orb-opacity: 0.5;
}

:root[data-theme="light"] {
  --bg: #fbf5ee;
  --bg-2: #f5ead9;
  --panel: #ffffff;
  --panel-2: #fff4e4;
  --chip-bg: rgba(255, 255, 255, 0.8);
  --nav-glass: rgba(255, 250, 243, 0.85);
  --nav-solid: rgba(255, 250, 243, 0.98);
  --line: rgba(209, 78, 0, 0.18);
  --text: #221607;
  --muted: #77644f;
  --shadow: 0 20px 50px rgba(120, 60, 0, 0.14);
  --glow: 0 0 34px rgba(238, 122, 0, 0.22);
  --orb-opacity: 0.26;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: "Inter", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  overflow-x: hidden;
  transition: background 0.45s ease, color 0.45s ease;
}

h1, h2, h3, h4 { font-family: "Sora", sans-serif; line-height: 1.2; }

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

.container { width: min(1180px, 92%); margin-inline: auto; }

::selection { background: var(--orange); color: #000; }

/* Custom scrollbar */
::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-track { background: var(--bg-2); }
::-webkit-scrollbar-thumb { background: linear-gradient(var(--orange-light), var(--orange-deep)); border-radius: 6px; }

/* ---------- Utilities ---------- */
.grad-text {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.eyebrow {
  font-family: "Sora", sans-serif;
  color: var(--orange);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  font-size: 0.78rem;
  margin-bottom: 0.7rem;
}

.section { padding: 30px 0; position: relative; }
.section-alt {
  background: radial-gradient(1200px 500px at 80% -10%, rgba(238, 122, 0, 0.07), transparent 60%), var(--bg-2);
  transition: background 0.45s ease;
}

.section-head { text-align: center; margin-bottom: 64px; }
.section-head h2 { font-size: clamp(1.9rem, 4vw, 2.5rem); font-weight: 800; }
.section-sub { color: var(--muted); margin-top: 0.8rem; }

.sub-heading { text-align: center; font-size: clamp(1.4rem, 3vw, 2rem); margin: 90px 0 44px; }

/* ---------- Scroll progress ---------- */
.scroll-progress {
  position: fixed; top: 0; left: 0; height: 3px; width: 0;
  background: var(--grad); z-index: 1002;
  box-shadow: 0 0 12px rgba(255, 194, 75, 0.8);
}

/* ---------- Reveal-on-scroll animations ---------- */
.reveal {
  opacity: 0;
  transform: translateY(42px);
  transition: opacity 0.9s cubic-bezier(0.22, 1, 0.36, 1), transform 0.9s cubic-bezier(0.22, 1, 0.36, 1);
  will-change: opacity, transform;
}
.reveal.visible { opacity: 1; transform: none; }
.delay-1 { transition-delay: 0.12s; }
.delay-2 { transition-delay: 0.24s; }
.delay-3 { transition-delay: 0.36s; }
.delay-4 { transition-delay: 0.48s; }
.delay-5 { transition-delay: 0.6s; }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
  .orbit-system, .ring, .sat, .orbit-core, .orb, .marquee-track { animation: none !important; }
  .hero-stage { height: auto; }
  .hero { position: relative; height: auto; min-height: 100svh; padding: 140px 0 80px; }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: "Sora", sans-serif; font-weight: 600; font-size: 0.95rem;
  padding: 14px 30px; border-radius: 999px; border: 0; cursor: pointer;
  transition: transform 0.3s ease, box-shadow 0.3s ease, background 0.3s ease;
}
.btn-solid { background: var(--grad); color: var(--on-grad); box-shadow: var(--glow); }
.btn-solid:hover { transform: translateY(-3px) scale(1.02); box-shadow: 0 0 60px rgba(238, 122, 0, 0.55); }
.btn-ghost { background: transparent; color: var(--orange); border: 1.5px solid rgba(238, 122, 0, 0.5); }
.btn-ghost:hover { background: rgba(238, 122, 0, 0.12); transform: translateY(-3px); border-color: var(--orange); }
.btn-sm { padding: 10px 22px; font-size: 0.85rem; }

/* ---------- Navbar ---------- */
.navbar {
  position: fixed; inset: 0 0 auto; z-index: 1000;
  padding: 18px 0; transition: padding 0.35s ease, background 0.35s ease, box-shadow 0.35s ease;
}
.navbar.scrolled {
  padding: 10px 0;
  background: var(--nav-glass);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.18);
  border-bottom: 1px solid var(--line);
}
.nav-inner { display: flex; align-items: center; gap: 16px; }

.brand { display: inline-flex; align-items: center; gap: 10px; font-family: "Sora", sans-serif; font-weight: 700; }
.brand-mark {
  display: grid; place-items: center; width: 40px; height: 40px;
  border-radius: 12px; background: var(--grad); color: var(--on-grad);
  font-size: 0.9rem; font-weight: 800; box-shadow: var(--glow);
}
.brand-text { font-size: 1rem; letter-spacing: 0.02em; }
.brand-text b { color: var(--orange); }

.nav-links { display: flex; gap: 2px; margin-left: auto; }
.nav-links a {
  font-size: 1 rem; font-weight: 500; color: var(--muted);
  padding: 8px 10px; border-radius: 8px; transition: color 0.25s, background 0.25s;
  white-space: nowrap;
}
@media (max-width: 1320px) {
  .nav-links a { font-size: 0.75rem; padding: 7px 7px; }
  .brand-text { font-size: 0.9rem; }
}
.nav-links a:hover { color: var(--text); background: rgba(247, 163, 76, 0.1); }
.nav-links a.active { color: var(--orange); }

.nav-cta { white-space: nowrap; }

.theme-toggle {
  width: 42px; height: 42px; border-radius: 50%;
  display: grid; place-items: center; font-size: 1.1rem;
  background: var(--chip-bg); border: 1px solid var(--line); cursor: pointer;
  transition: transform 0.35s ease, box-shadow 0.35s ease, background 0.35s;
}
.theme-toggle:hover { transform: rotate(24deg) scale(1.08); box-shadow: var(--glow); }

.hamburger { display: none; background: none; border: 0; cursor: pointer; padding: 6px; }
.hamburger span { display: block; width: 26px; height: 2.5px; background: var(--orange); margin: 5.5px 0; border-radius: 2px; transition: 0.35s; }
.hamburger.open span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

/* ---------- Hero (pinned stage — scroll scrubs the scene) ---------- */
.hero-stage { position: relative; height: 340vh; }

.hero {
  position: sticky; top: 0;
  height: 100svh;
  display: grid; place-items: center;
  overflow: hidden;
  background: var(--bg-2);
  padding: 110px 0 40px;
  transition: background 0.45s ease;
}

.hero-text, .countdown, .hero-scroll-hint { will-change: transform, opacity; }

.hero-bg { position: absolute; inset: 0; }
#particles { position: absolute; inset: 0; width: 100%; height: 100%; }

.orb { position: absolute; border-radius: 50%; filter: blur(90px); opacity: var(--orb-opacity); animation: float 12s ease-in-out infinite; }
.orb-1 { width: 480px; height: 480px; background: var(--orange-deep); top: -140px; left: -120px; }
.orb-2 { width: 380px; height: 380px; background: var(--orange); bottom: -100px; right: -80px; animation-delay: -4s; }
.orb-3 { width: 260px; height: 260px; background: var(--yellow); top: 40%; left: 60%; opacity: calc(var(--orb-opacity) * 0.5); animation-delay: -8s; }

@keyframes float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(40px, -50px) scale(1.08); }
}

.grid-overlay {
  position: absolute; inset: 0;
  background-image: linear-gradient(rgba(238, 122, 0, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(238, 122, 0, 0.07) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, #000 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, #000 30%, transparent 75%);
}

.hero-content {
  position: relative; z-index: 2;
  display: grid; grid-template-columns: 1.05fr 0.95fr;
  gap: 40px; align-items: center;
}

.hero-text { text-align: left; }

.hero-kicker {
  display: inline-block;
  font-family: "Sora", sans-serif; font-size: 0.82rem; font-weight: 600;
  color: var(--orange-deep);
  border: 1px solid rgba(238, 122, 0, 0.4);
  background: rgba(255, 194, 75, 0.1);
  padding: 9px 20px; border-radius: 999px; margin-bottom: 28px;
}
:root[data-theme="dark"] .hero-kicker, :root:not([data-theme="light"]) .hero-kicker { color: var(--yellow); }

.hero-title { font-size: clamp(2.1rem, 4.2vw, 3.6rem); font-weight: 800; letter-spacing: -0.02em; }
.hero-title .line { display: block; }
.hero-title sup { font-size: 0.45em; color: var(--orange); }

.hero-sub { font-size: clamp(1.05rem, 2vw, 1.3rem); color: var(--muted); margin-top: 22px; }

.hero-meta { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 30px; }
.meta-chip {
  background: var(--chip-bg); border: 1px solid var(--line);
  padding: 10px 20px; border-radius: 999px; font-size: 0.9rem;
  backdrop-filter: blur(6px);
}

.hero-cta { display: flex; flex-wrap: wrap; gap: 16px; margin-top: 36px; }

/* ---------- 3D Orbit system ---------- */
.orbit-scene {
  position: relative;
  perspective: 1100px;
  display: grid; place-items: center;
  min-height: 420px;
}

.orbit-glow {
  position: absolute; width: 55%; aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(238, 122, 0, 0.4), transparent 70%);
  filter: blur(34px);
  animation: glowPulse 4s ease-in-out infinite;
}
@keyframes glowPulse { 50% { opacity: 0.55; transform: scale(1.12); } }

.orbit-rig {
  transform-style: preserve-3d;
  will-change: transform;
}

.orbit-system {
  position: relative;
  width: min(400px, 70vw);
  aspect-ratio: 1;
  transform-style: preserve-3d;
  animation: systemDrift 18s ease-in-out infinite;
}
@keyframes systemDrift {
  0%, 100% { transform: rotateX(14deg) rotateY(-16deg); }
  50% { transform: rotateX(-10deg) rotateY(18deg); }
}

.orbit-core {
  position: absolute; inset: 0; margin: auto;
  width: 112px; height: 112px; border-radius: 50%;
  display: grid; place-items: center;
  font-family: "Sora", sans-serif; font-weight: 800; font-size: 1.7rem; color: var(--on-grad);
  background: var(--grad);
  box-shadow: 0 0 60px rgba(238, 122, 0, 0.65), 0 0 150px rgba(238, 122, 0, 0.3);
  animation: corePulse 3.2s ease-in-out infinite;
  transform: translateZ(0);
}
@keyframes corePulse {
  50% { box-shadow: 0 0 90px rgba(255, 194, 75, 0.85), 0 0 190px rgba(238, 122, 0, 0.4); }
}

.ring-tilt { position: absolute; transform-style: preserve-3d; }
.t1 { inset: 14%; transform: rotateX(72deg); }
.t2 { inset: 4%; transform: rotateX(64deg) rotateY(-38deg); }
.t3 { inset: -6%; transform: rotateX(78deg) rotateY(30deg); }

.ring {
  position: absolute; inset: 0; border-radius: 50%;
  border: 1.5px solid rgba(238, 122, 0, 0.45);
  transform-style: preserve-3d;
  animation: ringSpin var(--spd, 16s) linear infinite;
  box-shadow: inset 0 0 30px rgba(238, 122, 0, 0.08);
}
.ring-dashed { border-style: dashed; border-color: rgba(255, 194, 75, 0.5); }
@keyframes ringSpin { to { transform: rotateZ(360deg); } }

.sat {
  position: absolute; top: 0; left: 50%;
  width: 46px; height: 46px; margin: -23px 0 0 -23px;
  border-radius: 50%; display: grid; place-items: center; font-size: 1.15rem;
  background: var(--panel); border: 1px solid rgba(238, 122, 0, 0.55);
  box-shadow: 0 0 20px rgba(238, 122, 0, 0.55);
  animation: satCounter var(--spd, 16s) linear infinite;
}
.sat-alt { top: 100%; left: 50%; }
@keyframes satCounter { to { transform: rotateZ(-360deg); } }

/* Countdown */
.countdown {
  grid-column: 1 / -1;
  display: flex; justify-content: center; align-items: center; gap: 14px; margin-top: 40px;
}
.count-box {
  min-width: 96px; padding: 18px 12px; text-align: center;
  background: linear-gradient(160deg, rgba(247, 163, 76, 0.12), var(--chip-bg));
  border: 1px solid var(--line); border-radius: var(--radius);
  backdrop-filter: blur(6px);
}
.count-box span {
  display: block; font-family: "Sora", sans-serif;
  font-size: clamp(1.7rem, 4vw, 2.6rem); font-weight: 800;
  background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.count-box small { color: var(--muted); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.14em; }
.count-sep { font-size: 2rem; color: var(--orange); font-weight: 700; animation: blink 1.2s infinite; }
@keyframes blink { 50% { opacity: 0.25; } }

.hero-scroll-hint {
  position: absolute; bottom: 26px; left: 50%; transform: translateX(-50%);
  width: 26px; height: 44px; border: 2px solid rgba(238, 122, 0, 0.5); border-radius: 15px; z-index: 2;
}
.hero-scroll-hint span {
  position: absolute; top: 8px; left: 50%; width: 4px; height: 9px;
  background: var(--orange); border-radius: 3px; transform: translateX(-50%);
  animation: scrollHint 1.8s ease-in-out infinite;
}
@keyframes scrollHint { 0% { opacity: 1; top: 8px; } 70% { opacity: 0; top: 24px; } 100% { opacity: 0; } }

/* ---------- Marquee ---------- */
.marquee { overflow: hidden; background: var(--grad); padding: 13px 0; }
.marquee-track {
  display: flex; gap: 34px; width: max-content; align-items: center;
  animation: marquee 26s linear infinite;
  font-family: "Sora", sans-serif; font-weight: 700; color: var(--on-grad); font-size: 0.95rem;
  text-transform: uppercase; letter-spacing: 0.1em; white-space: nowrap;
}
.marquee-track i { font-style: normal; opacity: 0.6; }
@keyframes marquee { to { transform: translateX(-50%); } }

/* ---------- Cards / grids ---------- */
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }

.card {
  background: linear-gradient(165deg, var(--panel-2), var(--panel));
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: 32px 26px;
  transition: transform 0.4s ease, border-color 0.4s ease, box-shadow 0.4s ease, background 0.45s;
}
.card:hover { transform: translateY(-8px); border-color: rgba(238, 122, 0, 0.5); box-shadow: var(--shadow), var(--glow); }
.card h3 { font-size: 1.08rem; margin-bottom: 10px; }
.card p { color: var(--muted); font-size: 0.92rem; }
.card-icon {
  width: 56px; height: 56px; display: grid; place-items: center;
  font-size: 1.5rem; border-radius: 14px; margin-bottom: 18px;
  background: rgba(238, 122, 0, 0.12); border: 1px solid var(--line);
}
.card-link { display: inline-block; margin-top: 14px; color: var(--orange); font-weight: 600; font-size: 0.88rem; }
.card-link:hover { color: var(--orange-deep); }
.glow-card { border-color: rgba(238, 122, 0, 0.45); box-shadow: var(--glow); }

/* Stats */
.stats-row {
  display: flex; flex-wrap: wrap; justify-content: center; gap: clamp(30px, 7vw, 90px);
  margin-top: 74px; padding: 36px 20px;
  border-block: 1px solid var(--line);
}
.stat { text-align: center; font-family: "Sora", sans-serif; }
.stat sup { color: var(--orange); font-weight: 700; }
.stat-num {
  font-size: clamp(2.4rem, 5vw, 3.6rem); font-weight: 800;
  background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.stat small { display: block; color: var(--muted); text-transform: uppercase; letter-spacing: 0.16em; font-size: 0.72rem; margin-top: 4px; }

/* ---------- Timeline ---------- */
.timeline { position: relative; max-width: 860px; margin-inline: auto; padding: 20px 0; }
.timeline-line {
  position: absolute; left: 50%; top: 0; transform: translateX(-50%);
  width: 3px; height: 100%; background: rgba(238, 122, 0, 0.15); border-radius: 3px; overflow: hidden;
}
.timeline-line::after {
  content: ""; position: absolute; inset: 0;
  background: var(--grad); transform-origin: top;
  transform: scaleY(var(--progress, 0));
  transition: transform 0.2s linear;
}

.tl-item { position: relative; width: 50%; padding: 8px 48px; }
.tl-item:nth-child(odd of .tl-item) { left: 0; text-align: right; }
.tl-item:nth-child(even of .tl-item) { left: 50%; }

.tl-dot {
  position: absolute; top: 34px; width: 16px; height: 16px; border-radius: 50%;
  background: var(--bg); border: 3px solid var(--orange);
  box-shadow: 0 0 0 5px rgba(238, 122, 0, 0.15), 0 0 18px rgba(238, 122, 0, 0.6);
  z-index: 2;
}
.tl-item:nth-child(odd of .tl-item) .tl-dot { right: -8px; }
.tl-item:nth-child(even of .tl-item) .tl-dot { left: -8px; }

.tl-card {
  display: inline-block; background: linear-gradient(165deg, var(--panel-2), var(--panel));
  border: 1px solid var(--line); border-radius: 14px; padding: 18px 24px;
  transition: transform 0.35s, border-color 0.35s, box-shadow 0.35s;
}
.tl-card:hover { transform: scale(1.04); border-color: rgba(238, 122, 0, 0.55); box-shadow: var(--glow); }
.tl-date {
  font-family: "Sora", sans-serif; font-weight: 700; font-size: 0.8rem;
  color: var(--orange-deep); text-transform: uppercase; letter-spacing: 0.1em;
}
:root:not([data-theme="light"]) .tl-date { color: var(--yellow); }
.tl-card h4 { margin-top: 4px; font-size: 1rem; }
.tl-highlight { background: var(--grad); border: 0; }
.tl-highlight .tl-date, .tl-highlight h4 { color: var(--on-grad); }

/* ---------- Speakers ---------- */
.speaker-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 30px; }
.speaker-card {
  display: grid; grid-template-columns: 230px 1fr;
  background: linear-gradient(165deg, var(--panel-2), var(--panel));
  border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden;
  transition: transform 0.4s, border-color 0.4s, box-shadow 0.4s;
}
.speaker-card:hover { transform: translateY(-8px); border-color: rgba(238, 122, 0, 0.5); box-shadow: var(--shadow), var(--glow); }
.speaker-photo { position: relative; min-height: 260px; }
.speaker-photo img { width: 100%; height: 100%; object-fit: cover; filter: saturate(0.9); transition: transform 0.6s ease, filter 0.6s; }
.speaker-card:hover .speaker-photo img { transform: scale(1.06); filter: saturate(1.1); }
.speaker-flag {
  position: absolute; bottom: 12px; left: 12px;
  background: var(--chip-bg); backdrop-filter: blur(6px);
  border: 1px solid var(--line); border-radius: 999px;
  font-size: 0.75rem; padding: 5px 12px;
}
.speaker-body { padding: 28px 26px; }
.speaker-body h3 { font-size: 1.25rem; }
.speaker-topic { color: var(--orange); font-weight: 600; font-size: 0.92rem; margin: 8px 0 12px; }
.speaker-bio { color: var(--muted); font-size: 0.87rem; }

/* ---------- Tracks ---------- */
.tracks { display: grid; gap: 10px; }
.track {
  position: relative; display: grid; grid-template-columns: 1.15fr 0.85fr; align-items: stretch;
  background: linear-gradient(165deg, var(--panel-2), var(--panel));
  border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden;
  transition: transform 0.4s, border-color 0.4s, box-shadow 0.4s;
}
.track:hover { transform: translateY(-6px); border-color: rgba(238, 122, 0, 0.5); box-shadow: var(--shadow); }
.track-rev { direction: rtl; }
.track-rev > * { direction: ltr; }

.track-num {
  position: absolute; top: 6px; right: 22px; z-index: 2;
  font-family: "Sora", sans-serif; font-size: 2.4rem; font-weight: 800; line-height: 1;
  color: transparent; -webkit-text-stroke: 1.5px rgba(238, 122, 0, 0.3);
  pointer-events: none;
}
.track-body { padding: 42px 18px; }
.track-body h3 { font-size: 1.3rem; margin-bottom: 12px; }
.track-body h3::after {
  content: ""; display: block; width: 54px; height: 3px; margin-top: 10px;
  background: var(--grad); border-radius: 3px;
}
.track-body p { color: var(--muted); font-size: 0.93rem; }
.track-img { min-height: 240px; }
.track-img img { width:100%; height: 100%; object-fit: cover; transition: transform 0.7s ease; }
.track:hover .track-img img { transform: scale(1.07); }

.tag-list { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 20px; }
.tag-list li {
  font-size: 0.78rem; font-weight: 600;
  border: 1px solid rgba(238, 122, 0, 0.45); color: var(--orange);
  padding: 6px 14px; border-radius: 999px;
  transition: background 0.3s, color 0.3s;
}
.tag-list li:hover { background: var(--grad); color: var(--on-grad); border-color: transparent; }

/* ---------- Call for papers ---------- */
.deadline-banner {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 20px;
  background: linear-gradient(120deg, rgba(238, 122, 0, 0.16), rgba(255, 194, 75, 0.07));
  border: 1px solid rgba(238, 122, 0, 0.4); border-radius: var(--radius);
  padding: 28px 34px; margin-bottom: 42px;
}
.deadline-banner h3 { font-size: 1.2rem; }
.deadline-banner p { color: var(--orange); font-weight: 600; margin-top: 4px; }

.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.step {
  position: relative; background: linear-gradient(165deg, var(--panel-2), var(--panel));
  border: 1px solid var(--line); border-radius: var(--radius); padding: 58px 24px 28px;
  transition: transform 0.4s, border-color 0.4s;
}
.step:hover { transform: translateY(-8px); border-color: rgba(238, 122, 0, 0.5); }
.step-num {
  position: absolute; top: -22px; left: 24px;
  width: 46px; height: 46px; display: grid; place-items: center;
  background: var(--grad); color: var(--on-grad); border-radius: 14px;
  font-family: "Sora", sans-serif; font-weight: 800; font-size: 1.2rem;
  box-shadow: var(--glow);
}
.step h4 { font-size: 1rem; margin-bottom: 8px; }
.step p { color: var(--muted); font-size: 0.85rem; }
.step a { color: var(--orange); font-weight: 600; }

/* ---------- Registration ---------- */
.reg-layout { display: grid; grid-template-columns: 1.3fr 1fr; gap: 30px; align-items: start; }

.table-wrap {
  overflow-x: auto; border-radius: var(--radius);
  border: 1px solid var(--line);
  background: linear-gradient(165deg, var(--panel-2), var(--panel));
  padding: 8px;
}
.fee-table { width: 100%; border-collapse: collapse; min-width: 460px; }
.fee-table th {
  font-family: "Sora", sans-serif; text-align: left; font-size: 0.82rem;
  text-transform: uppercase; letter-spacing: 0.08em;
  background: var(--grad); color: var(--on-grad); padding: 15px 18px;
}
.fee-table th:first-child { border-radius: 12px 0 0 0; }
.fee-table th:last-child { border-radius: 0 12px 0 0; }
.fee-table td { padding: 14px 18px; font-size: 0.9rem; border-bottom: 1px solid var(--line); }
.fee-table td:not(:first-child) { font-family: "Sora", sans-serif; font-weight: 600; color: var(--orange); }
.fee-table tbody tr { transition: background 0.25s; }
.fee-table tbody tr:hover { background: rgba(238, 122, 0, 0.07); }
.table-note { color: var(--muted); font-size: 0.8rem; padding: 12px 16px; }

.reg-side { display: grid; gap: 22px; }

.check-list li { position: relative; padding-left: 26px; margin: 8px 0; color: var(--muted); font-size: 0.9rem; }
.check-list li::before { content: "✔"; position: absolute; left: 0; color: var(--orange); font-size: 0.85rem; }

/* ---------- Committee ---------- */
.chairs { display: flex; flex-wrap: wrap; justify-content: center; gap: 30px; margin-bottom: 70px; }
.chair-card {
  width: 300px; text-align: center; padding: 34px 26px;
  background: linear-gradient(165deg, var(--panel-2), var(--panel));
  border: 1px solid rgba(238, 122, 0, 0.4); border-radius: var(--radius);
  box-shadow: var(--glow);
  transition: transform 0.4s;
}
.chair-card:hover { transform: translateY(-8px) scale(1.02); }
.chair-card img {
  width: 130px; height: 130px; object-fit: cover; border-radius: 50%;
  margin: 0 auto 18px; border: 3px solid var(--orange);
  box-shadow: 0 0 0 6px rgba(238, 122, 0, 0.15);
}
.chair-card h3 { font-size: 1.05rem; }
.chair-card p { color: var(--muted); font-size: 0.85rem; margin-top: 10px; }
.role-badge {
  display: inline-block; margin-top: 10px;
  background: var(--grad); color: var(--on-grad);
  font-family: "Sora", sans-serif; font-weight: 700; font-size: 0.72rem;
  text-transform: uppercase; letter-spacing: 0.1em;
  padding: 6px 16px; border-radius: 999px;
}

.committee-tabs { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; margin-bottom: 44px; }
.tab-btn {
  font-family: "Sora", sans-serif; font-weight: 600; font-size: 0.8rem;
  color: var(--muted); background: var(--panel);
  border: 1px solid var(--line); border-radius: 999px;
  padding: 10px 20px; cursor: pointer;
  transition: all 0.3s;
}
.tab-btn:hover { color: var(--text); border-color: rgba(238, 122, 0, 0.5); }
.tab-btn.active { background: var(--grad); color: var(--on-grad); border-color: transparent; box-shadow: var(--glow); }

.tab-panel { display: none; }
.tab-panel.active { display: block; animation: fadeUp 0.55s ease both; }
@keyframes fadeUp { from { opacity: 0; transform: translateY(24px); } to { opacity: 1; transform: none; } }

.member-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(215px, 1fr)); gap: 18px; }
.member {
  text-align: center; padding: 26px 16px;
  background: linear-gradient(165deg, var(--panel-2), var(--panel));
  border: 1px solid var(--line); border-radius: 16px;
  transition: transform 0.35s, border-color 0.35s;
} 
.member:hover { transform: translateY(-6px); border-color: rgba(238, 122, 0, 0.5); }
.member img {
  width: 92px; height: 92px; object-fit: cover; border-radius: 50%;
  margin: 0 auto 14px; border: 2px solid rgba(238, 122, 0, 0.5);
  filter: saturate(0.9); transition: 0.35s;
}
.member:hover img { border-color: var(--orange); filter: saturate(1.1); transform: scale(1.05); }
.member h4 { font-size: 0.9rem; }
.member span { display: block; color: var(--orange); font-size: 0.72rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.08em; margin-top: 5px; }
.member p { color: var(--muted); font-size: 0.76rem; margin-top: 6px; }

/* ---------- Workshops ---------- */
.workshop-card {
  background: linear-gradient(165deg, var(--panel-2), var(--panel));
  border: 1px solid var(--line); border-left: 4px solid var(--orange);
  border-radius: var(--radius); padding: 30px 28px;
  transition: transform 0.4s, box-shadow 0.4s, border-color 0.4s;
}
.workshop-card:hover { transform: translateY(-7px); box-shadow: var(--shadow), var(--glow); border-left-color: var(--yellow); }
.ws-time {
  display: inline-block; font-family: "Sora", sans-serif; font-weight: 700; font-size: 0.75rem;
  color: var(--on-grad); background: var(--grad);
  padding: 6px 14px; border-radius: 999px; margin-bottom: 16px;
  text-transform: uppercase; letter-spacing: 0.06em;
}
.workshop-card h3 { font-size: 1.1rem; margin-bottom: 10px; }
.ws-by { color: var(--muted); font-size: 0.86rem; }

.note-banner {
  margin-top: 40px; padding: 22px 30px;
  border: 1px dashed rgba(238, 122, 0, 0.5); border-radius: var(--radius);
  background: rgba(255, 194, 75, 0.06);
  color: var(--muted); text-align: center;
}
.note-banner b { color: var(--orange); }

/* ---------- Award ---------- */
.award-layout { display: grid; grid-template-columns: 1.2fr 1fr; gap: 42px; align-items: start; }
.award-info p { color: var(--muted); }
.award-info h4 { margin: 26px 0 10px; color: var(--orange); }
.award-cta { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 30px; }

.medal-row { display: flex; gap: 16px; justify-content: center; margin-bottom: 26px; }
.medal {
  flex: 1; text-align: center; padding: 22px 10px;
  border-radius: 16px; border: 1px solid var(--line);
  background: linear-gradient(165deg, var(--panel-2), var(--panel));
  transition: transform 0.35s;
}
.medal:hover { transform: translateY(-6px) rotate(-2deg); }
.medal b {
  display: grid; place-items: center; width: 52px; height: 52px; margin: 0 auto 10px;
  border-radius: 50%; font-family: "Sora", sans-serif; font-size: 1.3rem; color: var(--on-grad);
}
.medal span { font-size: 0.75rem; color: var(--muted); line-height: 1.4; }
.medal.gold b { background: linear-gradient(135deg, #ffe082, var(--yellow)); box-shadow: 0 0 24px rgba(255, 194, 75, 0.5); }
.medal.silver b { background: linear-gradient(135deg, #eceff1, #b0bec5); }
.medal.merit b { background: linear-gradient(135deg, var(--orange-light), var(--orange-deep)); }

.key-dates {
  background: linear-gradient(165deg, var(--panel-2), var(--panel));
  border: 1px solid var(--line); border-radius: var(--radius); padding: 28px;
}
.key-dates h4 { margin-bottom: 16px; }
.key-dates li {
  display: flex; gap: 14px; align-items: baseline;
  padding: 10px 0; border-bottom: 1px solid var(--line);
  color: var(--muted); font-size: 0.88rem;
}
.key-dates li:last-child { border: 0; }
.key-dates li span {
  min-width: 118px; font-family: "Sora", sans-serif; font-weight: 700;
  font-size: 0.78rem; color: var(--orange);
}

/* ---------- Partners ---------- */
.partner-row { display: flex; flex-wrap: wrap; justify-content: center; align-items: center; gap: 40px; }
.partner-logo {
  background: #fff; border-radius: var(--radius); padding: 26px 40px;
  border: 1px solid var(--line);
  transition: transform 0.35s, box-shadow 0.35s;
}
.partner-logo:hover { transform: translateY(-6px); box-shadow: var(--glow); }
.partner-logo img { height: 64px; width: auto; object-fit: contain; }

/* ---------- Contact ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1.4fr; gap: 30px; align-items: stretch; }
.contact-cards { display: grid; gap: 22px; align-content: start; }
.map-wrap {
  border-radius: var(--radius); overflow: hidden;
  border: 1px solid var(--line); min-height: 380px;
  filter: grayscale(0.4) contrast(1.05);
  transition: filter 0.4s;
}
.map-wrap:hover { filter: none; }
.map-wrap iframe { width: 100%; height: 100%; border: 0; min-height: 380px; }

/* ---------- Footer ---------- */
.footer { background: var(--bg-2); border-top: 1px solid var(--line); padding-top: 70px; transition: background 0.45s; }
.footer-inner { display: grid; grid-template-columns: 1.5fr 1fr 1fr; gap: 40px; padding-bottom: 50px; }
.footer-tag { color: var(--muted); font-size: 0.9rem; margin-top: 16px; max-width: 320px; }
.footer-links { display: grid; gap: 10px; align-content: start; }
.footer-links h4 { color: var(--orange); font-size: 0.92rem; margin-bottom: 6px; }
.footer-links a { color: var(--muted); font-size: 0.88rem; transition: color 0.25s, padding-left 0.25s; }
.footer-links a:hover { color: var(--orange-deep); padding-left: 6px; }
.footer-bottom {
  border-top: 1px solid var(--line);
  text-align: center; padding: 22px 16px; color: var(--muted); font-size: 0.8rem;
}

/* ---------- Back to top ---------- */
.to-top {
  position: fixed; right: 26px; bottom: 26px; z-index: 999;
  width: 50px; height: 50px; border-radius: 50%; border: 0; cursor: pointer;
  background: var(--grad); color: var(--on-grad); font-size: 1.3rem; font-weight: 800;
  box-shadow: var(--glow);
  opacity: 0; transform: translateY(20px) scale(0.8); pointer-events: none;
  transition: opacity 0.35s, transform 0.35s;
}
.to-top.show { opacity: 1; transform: none; pointer-events: auto; }
.to-top:hover { transform: translateY(-4px); }

/* ==========================================================
   Responsive
   ========================================================== */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); row-gap: 44px; }
  .speaker-grid { grid-template-columns: 1fr; }
  .reg-layout, .award-layout, .contact-grid { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr 1fr; }

  .hero-content { grid-template-columns: 1fr; text-align: center; }
  .hero-text { text-align: center; }
  .hero-meta, .hero-cta { justify-content: center; }
  .orbit-scene { min-height: 340px; order: 2; }
  .orbit-system { width: min(300px, 62vw); }
  .countdown { order: 3; }
}

/* Collapse the menu into the hamburger before links can ever wrap */
@media (max-width: 1120px) {
  .nav-links {
    position: fixed; inset: 0 0 0 auto; width: min(320px, 82vw);
    flex-direction: column; gap: 6px; padding: 100px 30px 30px;
    background: var(--nav-solid); backdrop-filter: blur(16px);
    transform: translateX(100%); transition: transform 0.45s cubic-bezier(0.22, 1, 0.36, 1);
    border-left: 1px solid var(--line);
  }
  .nav-links.open { transform: none; }
  .nav-links a { font-size: 1rem; padding: 12px 14px; }
  .hamburger { display: block; z-index: 1001; margin-left: 0; }
  .theme-toggle { margin-left: auto; }
}

@media (max-width: 860px) {
  .nav-cta { display: none; }

  .grid-3, .grid-2 { grid-template-columns: 1fr; }

  /* Timeline collapses to left rail */
  .timeline-line { left: 10px; transform: none; }
  .tl-item, .tl-item:nth-child(odd of .tl-item), .tl-item:nth-child(even of .tl-item) {
    width: 100%; left: 0; text-align: left; padding: 14px 0 14px 46px;
  }
  .tl-item:nth-child(odd of .tl-item) .tl-dot,
  .tl-item:nth-child(even of .tl-item) .tl-dot { left: 3px; right: auto; }

  .speaker-card { grid-template-columns: 1fr; }
  .speaker-photo { min-height: 300px; }

  .track, .track-rev { grid-template-columns: 1fr; direction: ltr; }
  .track-img { order: -1; min-height: 200px; }

  .countdown { flex-wrap: wrap; gap: 10px; }
  .count-sep { display: none; }
  .count-box { min-width: 74px; }
}

@media (max-width: 560px) {
  .section { padding: 76px 0; }
  .grid-4 { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; }
  .deadline-banner { justify-content: center; text-align: center; }
  .orbit-scene { min-height: 280px; }
  .orbit-core { width: 88px; height: 88px; font-size: 1.3rem; }
  .sat { width: 38px; height: 38px; margin: -19px 0 0 -19px; font-size: 0.95rem; }
}