.org-committee { max-width: 780px; margin: 22px auto 0; }
.org-committee h3 { margin: 0 0 10px; font-family: Roboto, ui-sans-serif, system-ui, -apple-system, "Segoe UI", Helvetica, Arial; font-weight: 800; }
.org-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
.org-list li { background: var(--bg-elev); border: 1px solid var(--border); border-radius: 12px; padding: 10px 14px; box-shadow: var(--shadow-1); color: var(--text); }
/* Hide extra committee entries until expanded */
.org-list [data-more] { display: none; }
.org-list.is-expanded [data-more] { display: list-item; }
.org-actions { margin-top: 12px; display: flex; justify-content: center; }
/*
  CIIT 2026 — Scientific Theme (academic, clean, 2025)
  - Light-first, paper-like design with precise typography
  - Roboto for all typography
  - Subtle grid, restrained color accents, figure/table/quote polish
  - Dark mode supported via html[data-theme="dark"] toggle
*/

:root {
  /* Core palette: light-first */
  --bg: #f7f9fc;           /* page background (paper) */
  --bg-elev: #ffffff;      /* elevated surface */
  --text: #0a1020;         /* primary text */
  --muted: #516073;        /* secondary text */
  --brand: #3b28cc;        /* site accent color */
  --brand-2: #3b28cc;      /* site accent color (secondary) */
  --accent: #3b28cc;       /* site accent color (accent) */

  --card: #ffffff;         /* card background */
  --border: #e5e9f0;       /* subtle borders */

  --radius: 14px;
  --radius-sm: 10px;
  --shadow-1: 0 6px 24px rgba(10, 16, 32, .06);
  --shadow-2: 0 14px 48px rgba(10, 16, 32, .08);

  --container: 1160px;
}

/* Dark mode variant */
html[data-theme="dark"] {
  --bg: #0a0f1a;
  --bg-elev: #0f172a;
  --text: #e7ecf5;
  --muted: #a4b0c3;
  --card: #0f172a;
  --border: #20304b;
  --shadow-1: 0 10px 30px rgba(2, 6, 23, .5);
  --shadow-2: 0 20px 60px rgba(2, 6, 23, .55);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  color: var(--text);
  background: var(--bg);
  font-family: Roboto, ui-sans-serif, system-ui, -apple-system, "Segoe UI", Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  line-height: 1.65;
}

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

.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }
.skip-link { position: absolute; left: -9999px; top: auto; }
.skip-link:focus { left: 16px; top: 16px; background: var(--brand); color: white; padding: 8px 12px; border-radius: 8px; }

.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 24px; }
.section { padding: 84px 0; }
.section.alt { background: linear-gradient(180deg, color-mix(in oklab, var(--brand) 8%, transparent), color-mix(in oklab, var(--brand-2) 6%, transparent)); }
.section-head { text-align: center; margin-bottom: 34px; }
.section-head h2 { font-family: Roboto, ui-sans-serif, system-ui, -apple-system, "Segoe UI", Helvetica, Arial; font-weight: 700; font-size: clamp(28px, 2.4vw, 42px); margin: 0 0 8px; letter-spacing: -0.01em; }
.section-lead { max-width: 780px; margin: 0 auto; color: var(--muted); }

/* Buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 10px; padding: 12px 18px; border-radius: 12px; border: 1px solid transparent; color: white; text-decoration: none; font-weight: 700; transition: .2s ease; }
.btn--small { padding: 8px 12px; font-size: 14px; }
.btn--primary { background: linear-gradient(135deg, var(--brand), color-mix(in oklab, var(--brand-2) 60%, var(--brand))); box-shadow: var(--shadow-1); }
.btn--primary:hover { filter: brightness(1.05); transform: translateY(-1px); }
.btn--ghost { background: transparent; border-color: color-mix(in oklab, var(--text) 16%, transparent); color: var(--text); }
.btn--ghost:hover { background: color-mix(in oklab, var(--text) 6%, transparent); }

/* Header */
.site-header { position: sticky; top: 0; z-index: 50; backdrop-filter: saturate(120%) blur(8px); background: color-mix(in oklab, var(--bg) 85%, transparent); border-bottom: 1px solid color-mix(in oklab, var(--border) 70%, transparent); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 96px; }
.brand { display: inline-flex; align-items: center; gap: 12px; color: inherit; text-decoration: none; font-weight: 800; letter-spacing: .15px; }
.brand-logo { width: 38px; height: 38px; border-radius: 8px; }
.brand-text { font-size: clamp(28px, 5vw, 60px); line-height: 1; color: #3b28cc; font-weight: 900; letter-spacing: -0.01em; }

.nav-toggle { display: none; width: 40px; height: 40px; border-radius: 10px; border: 1px solid color-mix(in oklab, var(--text) 16%, transparent); background: transparent; color: var(--text); }
.nav-list { display: flex; gap: 18px; align-items: center; list-style: none; padding: 0; margin: 0; }
.nav-list a { color: var(--text); text-decoration: none; padding: 8px 10px; border-radius: 10px; }
.nav-list a:hover { background: color-mix(in oklab, var(--text) 6%, transparent); }

@media (max-width: 900px) {
  .nav-toggle { display: inline-grid; place-items: center; }
  .nav-list { position: absolute; right: 16px; top: 96px; flex-direction: column; align-items: stretch; gap: 8px; background: var(--bg-elev); border: 1px solid var(--border); box-shadow: var(--shadow-2); padding: 12px; border-radius: 12px; width: min(260px, calc(100vw - 32px)); display: none; }
  .nav-list.is-open { display: flex; }
}

/* Hero */
.hero { position: relative; padding: 20px 0 80px; overflow: clip;
  background:
    radial-gradient(1000px 500px at 10% -20%, color-mix(in oklab, var(--brand) 10%, transparent), transparent),
    radial-gradient(800px 400px at 90% 0%, color-mix(in oklab, var(--brand-2) 10%, transparent), transparent);
}
.hero-inner { display: grid; grid-template-columns: 1.1fr .9fr; gap: 32px; align-items: center; }
.eyebrow { color: #3b28cc; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; font-size: clamp(14px, 1.6vw, 20px); margin: 0 0 10px; }
.hero h1 { font-family: Roboto, ui-sans-serif, system-ui, -apple-system, "Segoe UI", Helvetica, Arial; font-weight: 800; font-size: clamp(36px, 5.4vw, 64px); line-height: 1.04; margin: 0 0 14px; letter-spacing: -0.01em; }
.lead { color: var(--muted); font-size: clamp(16px, 2vw, 20px); margin: 0 0 20px; }
.hero-cta { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 16px; }
.hero-stats { display: flex; gap: 24px; list-style: none; padding: 0; margin: 18px 0 0; color: var(--muted); }
.hero-stats strong { display: block; font-size: 22px; color: var(--text); }
.hero-visual { display: grid; place-items: center; }

/* Countdown tweaks */
.countdown { margin-top: 10px; }
.countdown strong { font-size: 28px; color: var(--brand-2); }

/* IEEE Xplore badge */
.hero-badges { margin: 8px 0 0; display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.hero-badges .badge-break { flex-basis: 100%; height: 0; }
.badge-group { display: flex; flex-direction: column; gap: 4px; align-items: flex-start; }
.badge-note { font-size: 12px; color: var(--muted); line-height: 1.2; }
.badge { display: inline-flex; align-items: center; gap: 8px; padding: 6px 10px; border-radius: 999px; border: 1px solid var(--border); background: color-mix(in oklab, var(--brand) 10%, white); color: #0a1020; text-decoration: none; font-weight: 700; font-size: 14px; }
.badge:hover { filter: brightness(1.03); transform: translateY(-1px); }
.badge i { color: var(--brand-2); }
.badge .badge-logo { height: 18px; width: auto; display: block; }
/* Larger variant for specific badges */
.badge .badge-logo--lg { height: 30px; }
html[data-theme="dark"] .badge .badge-logo { filter: invert(1) grayscale(1) brightness(1.4); }

/* Animated Microsoft CMT badge */
.badge--cmt { position: relative; border: 1px solid var(--brand); color: #fff; background: var(--brand); box-shadow: 0 8px 24px color-mix(in oklab, var(--brand) 30%, transparent); padding: 8px 14px; gap: 10px; will-change: transform, box-shadow; animation: floatY 3.2s ease-in-out infinite; }
.badge--cmt i { color: #ffffff; }
.badge--cmt:hover { transform: translateY(-2px) scale(1.02); box-shadow: 0 12px 30px color-mix(in oklab, var(--brand) 40%, transparent); }
.badge--cmt::before { content: ""; position: absolute; top: -20%; left: -20%; width: 60px; height: 200%; background: linear-gradient(90deg, rgba(255,255,255,.0) 0%, rgba(255,255,255,.45) 50%, rgba(255,255,255,.0) 100%); transform: rotate(20deg); filter: blur(1px); animation: sheen 4.8s cubic-bezier(.4, .0, .2, 1) infinite; }

@keyframes floatY { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-3px); } }
/* removed gradientShift to keep exact accent color */
@keyframes sheen { 0% { transform: translateX(-60vw) rotate(20deg); opacity: .0; } 10% { opacity: .7; } 50% { opacity: .2; } 100% { transform: translateX(60vw) rotate(20deg); opacity: .0; } }

@media (prefers-reduced-motion: reduce) {
  .badge--cmt { animation: none; }
  .badge--cmt::before { display: none; }
}

@media (max-width: 980px) { .hero-inner { grid-template-columns: 1fr; } .hero { padding-top: 100px; } }

/* Parallax full-screen image section */
.parallax-hero { position: relative; height: 100vh; background-image: url("../../CIIT 2026_files/robot.png"); background-size: cover; background-position: center center; background-attachment: scroll; }
.parallax-hero::before { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, color-mix(in oklab, var(--brand) 12%, transparent), transparent 40%, color-mix(in oklab, black 10%, transparent)); }
@media (min-width: 768px) { .parallax-hero { background-attachment: fixed; } }

/* Parallax video section */
.parallax-video { position: relative; height: 100vh; overflow: hidden; width: 100%; }
.parallax-video::before { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, color-mix(in oklab, var(--brand) 10%, transparent), transparent 50%, color-mix(in oklab, black 10%, transparent)); pointer-events: none; }
.parallax-video video { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; transform: scale(1.08); filter: saturate(1.05) contrast(1.02); will-change: transform; }

/* Subtle hero ornaments */
.bg-grid { position: absolute; inset: 0;
  background:
    linear-gradient(to right, color-mix(in oklab, var(--brand) 35%, transparent) 1px, transparent 1px),
    linear-gradient(to bottom, color-mix(in oklab, var(--brand) 35%, transparent) 1px, transparent 1px),
    linear-gradient(180deg, color-mix(in oklab, var(--brand) 12%, transparent), transparent 60%);
  background-size: 44px 44px, 44px 44px, auto;
  background-repeat: repeat, repeat, no-repeat;
  mask-image: radial-gradient(1000px 600px at 30% 0%, black, transparent);
  pointer-events: none; opacity: .42; }
.bg-orb { position: absolute; width: 320px; height: 320px; filter: blur(38px); border-radius: 50%; opacity: .5; mix-blend-mode: screen; animation: float 22s ease-in-out infinite; }
.orb-1 { background: radial-gradient(circle at 30% 30%, color-mix(in oklab, var(--brand) 50%, white), transparent 60%); top: -100px; left: -80px; }
.orb-2 { background: radial-gradient(circle at 70% 70%, color-mix(in oklab, var(--brand-2) 50%, white), transparent 60%); bottom: -120px; right: -80px; animation-delay: -8s; }
@keyframes float { 50% { transform: translate3d(0, -12px, 0) scale(1.02); } }

/* Code card */
.code-card { width: min(560px, 100%); border-radius: 16px; background: linear-gradient(180deg, color-mix(in oklab, var(--card) 96%, transparent), color-mix(in oklab, var(--card) 100%, transparent)); border: 1px solid var(--border); box-shadow: var(--shadow-2); overflow: hidden; }
.code-header { display: flex; gap: 8px; padding: 12px; border-bottom: 1px solid var(--border); background: color-mix(in oklab, var(--bg-elev) 85%, transparent); }
.code-header span { width: 10px; height: 10px; border-radius: 50%; }
.code-header span:nth-child(1) { background: #3b28cc; }
.code-header span:nth-child(2) { background: #3b28cc; }
.code-header span:nth-child(3) { background: #3b28cc; }
.code-card pre { margin: 0; padding: 16px 18px; font-size: 14px; color: color-mix(in oklab, var(--brand) 50%, #0a1020); overflow: hidden; white-space: pre-wrap; overflow-wrap: anywhere; }

/* LLM interface inside the code card */
.llm { padding: 12px; display: grid; gap: 10px; }
.llm-msg { display: grid; gap: 6px; }
.llm-role { font-weight: 800; font-size: 12px; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); display: inline-flex; align-items: center; gap: 6px; line-height: 1; }
.llm-avatar { width: auto; height: auto; border-radius: 0; display: inline-flex; align-items: center; justify-content: center; flex: 0 0 auto; background: transparent; color: var(--brand); box-shadow: none; vertical-align: middle; }
.llm-avatar i { font-size: 14px; line-height: 1; display: block; color: var(--brand); }
.from-user .llm-role { color: var(--brand-2); }
.from-ai .llm-role { color: color-mix(in oklab, var(--brand) 70%, var(--text)); }
.llm-code { margin: 0; padding: 12px 14px; border-radius: 10px; border: 1px solid var(--border); background: color-mix(in oklab, var(--brand) 6%, var(--bg-elev)); color: color-mix(in oklab, var(--brand) 45%, #0a1020); font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace; font-size: 13px; line-height: 1.5; overflow: auto; }
.llm-bubble { border: 1px solid var(--border); background: var(--bg-elev); border-radius: 12px; padding: 12px 14px; box-shadow: var(--shadow-1); position: relative; }
.llm-bubble::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 3px; background: var(--brand); border-top-left-radius: 12px; border-bottom-left-radius: 12px; opacity: .8; }
.llm-bubble p { margin: 0 0 8px; color: var(--text); }
.cursor { display: inline-block; width: 8px; height: 1em; background: color-mix(in oklab, var(--text) 60%, transparent); margin-left: 4px; vertical-align: -2px; animation: blink 1.1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }

/* Hide AI JSON code until JS reveals/animates it */
.code-card .llm .from-ai .llm-bubble pre.llm-code { visibility: hidden; }
@media (prefers-reduced-motion: reduce) {
  .code-card .llm .from-ai .llm-bubble pre.llm-code { visibility: visible; }
}

/* Features */
.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 28px; }
.feature { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; box-shadow: var(--shadow-1); transition: transform .15s ease, border-color .2s ease; }
.feature:hover { transform: translateY(-2px); border-color: color-mix(in oklab, var(--brand) 40%, var(--border)); }
.feature-icon { width: 40px; height: 40px; display: grid; place-items: center; border-radius: 10px; background: linear-gradient(135deg, color-mix(in oklab, var(--brand) 30%, white), color-mix(in oklab, var(--brand-2) 25%, white)); color: #0a1020; margin-bottom: 10px; }
.feature h3 { margin: 6px 0 8px; font-family: Roboto, ui-sans-serif, system-ui, -apple-system, "Segoe UI", Helvetica, Arial; font-weight: 700; font-size: 18px; }
.feature p { margin: 0; color: var(--muted); }

@media (max-width: 900px) { .features { grid-template-columns: 1fr 1fr; } }
@media (max-width: 600px) { .features { grid-template-columns: 1fr; } }

/* Tracks */
.track-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 28px; }
.track { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; box-shadow: var(--shadow-1); }
.track h3 { margin: 6px 0 10px; font-family: Roboto, ui-sans-serif, system-ui, -apple-system, "Segoe UI", Helvetica, Arial; font-weight: 700; }
.track h3 { display: flex; align-items: center; gap: 8px; }
.scope-icon { color: var(--brand-2); font-size: 16px; }
.track ul { margin: 0; padding-left: 18px; color: var(--muted); }
@media (max-width: 900px) { .track-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 600px) { .track-grid { grid-template-columns: 1fr; } }

/* Cards */
.card-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; box-shadow: var(--shadow-1); text-align: center; }
.person .avatar { display: none; }
/* Web-frame speaker placeholders */
.person .avatar-frame { width: 100%; aspect-ratio: 4 / 3; border-radius: 12px; border: 1px solid var(--border); background: var(--bg-elev); box-shadow: var(--shadow-1); overflow: hidden; margin: 0 0 12px; }
.person .frame-header { display: flex; gap: 8px; padding: 8px; border-bottom: 1px solid var(--border); background: color-mix(in oklab, var(--bg-elev) 85%, transparent); }
.person .frame-header span { width: 10px; height: 10px; border-radius: 50%; background: var(--brand); }
.person .frame-body { height: calc(100% - 34px); display: grid; place-items: center; color: var(--brand); position: relative; }
.person .frame-body i { font-size: 42px; opacity: .9; }
.skeleton { background: linear-gradient(100deg, color-mix(in oklab, var(--brand) 6%, transparent) 20%, color-mix(in oklab, var(--brand) 14%, transparent) 40%, color-mix(in oklab, var(--brand) 6%, transparent) 60%); background-size: 200% 100%; animation: shimmer 2s linear infinite; }
@keyframes shimmer { 0% { background-position: 200% 0; } 100% { background-position: -200% 0; } }
.card h3 { margin: 4px 0 6px; font-family: Roboto, ui-sans-serif, system-ui, -apple-system, "Segoe UI", Helvetica, Arial; font-weight: 700; font-size: 18px; }
.card p { margin: 0; color: var(--muted); }
@media (max-width: 1100px) { .card-grid { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 800px) { .card-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 520px) { .card-grid { grid-template-columns: 1fr; } }

/* Tabs & timeline */
.tabs { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow-1); overflow: hidden; }
.tab-list { display: flex; gap: 8px; padding: 8px; border-bottom: 1px solid var(--border); background: color-mix(in oklab, var(--bg-elev) 85%, transparent); flex-wrap: wrap; }
.tab { appearance: none; border: 1px solid var(--border); background: transparent; color: var(--text); padding: 8px 14px; border-radius: 10px; font-weight: 700; cursor: pointer; }
.tab.is-active, .tab:focus-visible { outline: none; border-color: var(--brand); box-shadow: 0 0 0 3px color-mix(in oklab, var(--brand) 35%, transparent); }
.tab[disabled], .tab[aria-disabled="true"] { opacity: .5; cursor: not-allowed; pointer-events: none; }
.tab-panels { padding: 10px; }
.timeline { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.timeline li { display: grid; grid-template-columns: 90px 1fr; gap: 14px; align-items: center; background: var(--bg-elev); border: 1px solid var(--border); border-radius: 12px; padding: 10px 14px; }
.timeline time { font-weight: 800; color: var(--brand-2); }

.schedule-actions { margin-top: 16px; display: flex; gap: 10px; flex-wrap: wrap; justify-content: center; }

/* Gallery */
.gallery-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.gallery-item { display: block; position: relative; overflow: hidden; border-radius: 12px; border: 1px solid var(--border); background: var(--bg-elev); box-shadow: var(--shadow-1); }
.gallery-item img { width: 100%; height: 100%; object-fit: cover; display: block; transition: transform .35s ease; aspect-ratio: 4 / 3; }
.gallery-item:hover img { transform: scale(1.03); }
@media (max-width: 1100px) { .gallery-grid { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 800px) { .gallery-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 520px) { .gallery-grid { grid-template-columns: 1fr; } }

/* Archive list */
.modern-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.modern-list li a { display: grid; grid-template-columns: 24px 1fr auto; align-items: center; gap: 12px; padding: 12px 14px; border: 1px solid var(--border); border-radius: 12px; background: var(--bg-elev); color: inherit; text-decoration: none; box-shadow: var(--shadow-1); }
.modern-list .arrow { color: var(--brand); transition: transform .2s ease; }
.modern-list li a:hover .arrow { transform: translateX(4px); }
.modern-list .title { font-weight: 700; }
.modern-list .date { color: var(--muted); font-size: 14px; }
/* Hide older items until expanded */
.modern-list [data-more] { display: none; }
.modern-list.is-expanded [data-more] { display: block; }
@media (max-width: 600px) {
  .modern-list li a { grid-template-columns: 24px 1fr; grid-template-rows: auto auto; }
  .modern-list .date { grid-column: 2; }
}

.archive-actions { margin-top: 14px; display: flex; justify-content: center; }

/* Organization cards */
.org-cards { max-width: 780px; margin: 0 auto; display: grid; gap: 12px; }
.org-card { display: flex; align-items: center; gap: 14px; padding: 12px 14px; border: 1px solid var(--border); border-left: 4px solid var(--brand); border-radius: 14px; background: var(--bg-elev); box-shadow: var(--shadow-1); }
.org-card img { width: 64px; height: 64px; border-radius: 50%; object-fit: cover; border: 2px solid var(--brand); }
.org-content { display: grid; gap: 2px; }
.org-name { font-weight: 800; color: var(--brand); }
.org-title { color: var(--muted); font-size: 14px; }
@media (max-width: 520px) { .org-card { align-items: flex-start; } .org-card img { width: 56px; height: 56px; } }

/* Submission section */
.calendar-section { max-width: 780px; margin: 0 auto; display: grid; gap: 14px; }
.calendar-section h4 { margin: 8px 0 6px; font-size: 18px; font-weight: 800; }
.submit-btn { display: inline-flex; align-items: center; justify-content: center; padding: 12px 18px; border-radius: 999px; border: 2px solid var(--brand); background: #ffffff; color: var(--brand); font-weight: 800; text-decoration: none; box-shadow: var(--shadow-1); }
.submit-btn:hover { transform: translateY(-1px); filter: brightness(1.02); }
.calendar-note { font-size: 14px; color: var(--muted); margin: 0; }
.calendar-dates { display: grid; gap: 10px; }
.date-item { display: grid; grid-template-columns: 28px 1fr; align-items: center; gap: 12px; background: var(--bg-elev); border: 1px solid var(--border); border-radius: 12px; padding: 10px 14px; box-shadow: var(--shadow-1); }
.date-icon { color: var(--brand); font-size: 18px; }
.date-content { display: grid; gap: 2px; }
.date-label { font-weight: 800; }
.date-value { color: var(--muted); font-size: 14px; }
.conference-info { background: var(--bg-elev); border: 1px solid var(--border); border-radius: 12px; padding: 12px 14px; box-shadow: var(--shadow-1); }
.conf-title { margin: 0 0 6px; display: flex; align-items: center; gap: 8px; font-size: 16px; }

/* Submission guidelines */
.guidelines-section { max-width: 780px; margin: 34px auto 0; display: grid; gap: 12px; }
.guidelines-section h3 { margin: 0 0 6px; }
.paper-types { display: grid; gap: 10px; }
.paper-types h4 { margin: 4px 0; font-size: 18px; font-weight: 800; }
.paper-item { display: flex; align-items: flex-start; gap: 12px; padding: 12px 14px; background: var(--bg-elev); border: 1px solid var(--border); border-left: 4px solid var(--brand); border-radius: 12px; box-shadow: var(--shadow-1); }
.paper-icon { color: var(--brand); font-size: 18px; line-height: 1; margin-top: 2px; }
.paper-content { color: var(--text); font-size: 15px; }

/* Fees */
.fees { max-width: 780px; margin: 28px auto 0; }
.fee-section { display: grid; gap: 10px; }
.fee-block { background: var(--bg-elev); border: 1px solid var(--border); border-left: 4px solid var(--brand); border-radius: 12px; padding: 12px 14px; box-shadow: var(--shadow-1); }
.fee-line { color: var(--text); }
.highlight-box { display: inline-block; background: color-mix(in oklab, var(--brand) 8%, white); padding: 4px 8px; border-radius: 8px; }

/* Registration */
.registration { max-width: 780px; margin: 28px auto 0; }

/* Payment info */
.payment-info { max-width: 780px; margin: 28px auto 0; display: grid; gap: 8px; }
.bank-details { max-width: 780px; }
.bank-box { background: var(--bg-elev); border: 1px solid var(--border); border-left: 4px solid var(--brand); border-radius: 12px; padding: 12px 14px; box-shadow: var(--shadow-1); }
.bank-row { margin-bottom: 6px; color: var(--text); }

/* Lightbox */
#lightbox[hidden] { display: none !important; }
#lightbox { position: fixed; inset: 0; background: rgba(2, 6, 23, .88); display: grid; place-items: center; z-index: 1000; padding: 20px; }
#lightbox img { max-width: 92vw; max-height: 88vh; border-radius: 12px; box-shadow: var(--shadow-2); }
.lightbox-close { position: fixed; top: 16px; right: 16px; width: 40px; height: 40px; border-radius: 10px; background: var(--bg-elev); color: var(--text); border: 1px solid var(--border); box-shadow: var(--shadow-1); display: grid; place-items: center; font-size: 22px; font-weight: 800; cursor: pointer; }
.lightbox-close:hover { transform: translateY(-1px); }

/* Venue */
.venue-card { display: grid; grid-template-columns: 1.2fr .8fr; gap: 18px; background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; box-shadow: none; }
.venue-map { background: linear-gradient(135deg, color-mix(in oklab, var(--brand) 14%, white), color-mix(in oklab, var(--brand-2) 14%, white)); border-radius: 12px; display: grid; place-items: center; overflow: hidden; min-height: 260px; }
.venue-map iframe { width: 100%; height: 100%; border: 0; display: block; }
.map-placeholder { color: color-mix(in oklab, var(--brand) 60%, #0a1020); font-weight: 800; letter-spacing: .08em; text-transform: uppercase; opacity: .9; }
.venue-info h3 { margin: 0 0 8px; font-family: Roboto, ui-sans-serif, system-ui, -apple-system, "Segoe UI", Helvetica, Arial; font-weight: 700; }
.venue .actions { display: flex; gap: 10px; margin-top: 10px; flex-wrap: wrap; }
.venue-hotel { margin-top: 10px; }
.venue-hotel img { height: 200px; width: auto; max-width: 100%; display: block; }
@media (max-width: 600px) { .venue-hotel img { height: 48px; } }
@media (max-width: 900px) { .venue-card { grid-template-columns: 1fr; } }

/* Sponsors */
.logo-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; align-items: stretch; justify-content: center; }
.logo { height: 72px; background: var(--bg-elev); border: 1px solid var(--border); border-radius: 12px; display: grid; place-items: center; color: var(--muted); font-weight: 800; letter-spacing: .06em; text-transform: uppercase; }
@media (max-width: 1100px) { .logo-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 700px) { .logo-grid { grid-template-columns: repeat(2, 1fr); } }

/* Sponsor placeholder frames */
.logo-grid .sponsor-frame { background: var(--bg-elev); border: 1px solid var(--border); border-radius: 12px; overflow: hidden; box-shadow: var(--shadow-1); display: grid; grid-template-rows: auto 1fr; min-height: 90px; aspect-ratio: 5 / 2; }
.logo-grid .sponsor-frame .frame-header { display: flex; gap: 8px; padding: 8px; border-bottom: 1px solid var(--border); background: color-mix(in oklab, var(--bg-elev) 85%, transparent); }
.logo-grid .sponsor-frame .frame-header span { width: 10px; height: 10px; border-radius: 50%; background: var(--brand); }
.logo-grid .sponsor-frame .frame-body { display: grid; place-items: center; color: var(--muted); font-weight: 800; letter-spacing: .04em; text-transform: uppercase; }
.logo-grid .sponsor-frame:hover { transform: translateY(-2px); border-color: color-mix(in oklab, var(--brand) 40%, var(--border)); }

/* Co-sponsorship note below partners */
.partners-note { margin-top: 16px; display: flex; gap: 10px; align-items: center; justify-content: center; color: var(--muted); font-weight: 700; text-align: center; }
.partners-note .co-sponsor-logo { height: 44px; width: auto; display: block; }
@media (max-width: 520px) {
  .partners-note .co-sponsor-logo { height: 36px; }
}
html[data-theme="dark"] .partners-note .co-sponsor-logo { filter: invert(1) grayscale(1) brightness(1.4); }

/* Partner tiers */
.partners-tier { margin-top: 18px; border-radius: var(--radius); padding: 16px; border: 1px solid var(--border); box-shadow: var(--shadow-1); }
.partners-tier h3 { margin: 0 0 10px; font-family: Roboto, ui-sans-serif, system-ui, -apple-system, "Segoe UI", Helvetica, Arial; font-weight: 800; }
.partners-tier .logo-grid { margin-top: 10px; }
/* Center only the Platinum tier title */
.partners-tier.platinum h3 { text-align: center; }

/* Featured Platinum single partner layout */
.partners-tier.platinum .logo-grid { grid-template-columns: repeat(3, 1fr); max-width: var(--container); margin-left: auto; margin-right: auto; }
@media (max-width: 900px) { .partners-tier.platinum .logo-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 520px) { .partners-tier.platinum .logo-grid { grid-template-columns: 1fr; } }
/* Smaller logo size for Platinum Loka logo */
.partners-tier.platinum .partner-logo { display: block; width: auto; max-width: 90%; max-height: 110px; object-fit: contain; }
@media (max-width: 520px) {
  .sponsor-frame--hero { min-height: 160px; }
  .sponsor-frame--hero .partner-logo { max-height: 120px; }
}

/* Metallic gradients for tiers */
.partners-tier.platinum { background: linear-gradient(135deg, #f9fbff 0%, #eef2f9 40%, #ffffff 60%, #dfe6f2 100%); border: 1px solid #cfd6e2; }
.partners-tier.gold { background: linear-gradient(135deg, #f8e6a0 0%, #f4d24d 40%, #ffd36b 60%, #e2b23a 100%); }
.partners-tier.silver { background: linear-gradient(135deg, #c0c3c9 0%, #d1d3d8 35%, #e3e5e9 60%, #9aa0ab 100%); }
.partners-tier.bronze { background: linear-gradient(135deg, #d7a374 0%, #c9823b 40%, #e3a063 60%, #a9632a 100%); }

/* Dark mode tweaks for metallic gradients (slightly deeper tones) */
html[data-theme="dark"] .partners-tier.platinum { background: linear-gradient(135deg, #c7cfdb 0%, #b9c4d6 40%, #d9e0ea 60%, #9ea9b9 100%); }
html[data-theme="dark"] .partners-tier.gold { background: linear-gradient(135deg, #cfae52 0%, #bd942e 40%, #d9b04e 60%, #9b731f 100%); }
html[data-theme="dark"] .partners-tier.silver { background: linear-gradient(135deg, #8f939b 0%, #9ca1a9 35%, #acb0b7 60%, #757b86 100%); }
html[data-theme="dark"] .partners-tier.bronze { background: linear-gradient(135deg, #b37f53 0%, #9a612d 40%, #b97b44 60%, #7d4a21 100%); }

/* CTA */
.cta-section { background: radial-gradient(800px 400px at 50% -10%, color-mix(in oklab, var(--brand) 14%, white), transparent); padding: 70px 0; }
.cta { display: grid; grid-template-columns: 1.2fr .8fr; gap: 18px; align-items: center; }
.cta-form { display: grid; grid-template-columns: 1fr auto; gap: 10px; align-items: start; }
.cta-form input { height: 46px; border-radius: 12px; border: 1px solid var(--border); background: var(--bg); color: var(--text); padding: 0 12px; }
.form-note { grid-column: 1 / -1; margin: 0; color: var(--muted); font-size: 14px; }
@media (max-width: 900px) { .cta { grid-template-columns: 1fr; } .cta-form { grid-template-columns: 1fr; } }

/* About logos */
.about-logos { display: flex; justify-content: center; align-items: center; gap: 20px; margin-top: 14px; flex-wrap: wrap; }
.about-logo img { width: 110px; height: 110px; object-fit: contain; border-radius: 50%; background: var(--bg-elev); padding: 14px; border: 1px solid var(--border); box-shadow: var(--shadow-1); }
@media (max-width: 520px) { .about-logo img { width: 90px; height: 90px; } }

/* Footer */
.site-footer { border-top: 1px solid var(--border); padding: 22px 0; background: color-mix(in oklab, var(--bg) 96%, transparent); }
.footer-inner { display: grid; grid-template-columns: 1fr auto auto; align-items: center; gap: 12px; }
.footer-links, .social { display: flex; gap: 14px; list-style: none; padding: 0; margin: 0; }
.footer-links a { color: var(--muted); text-decoration: none; }
.footer-links a:hover { color: var(--text); }
.footer-brand { display: inline-flex; align-items: center; gap: 10px; color: var(--muted); }

@media (max-width: 800px) { .footer-inner { grid-template-columns: 1fr; justify-items: center; } }

/* Theme toggle */
.theme-toggle { position: fixed; right: 16px; bottom: 16px; width: 44px; height: 44px; border-radius: 12px; background: var(--bg-elev); color: var(--text); border: 1px solid var(--border); box-shadow: var(--shadow-1); display: grid; place-items: center; cursor: pointer; }
.theme-toggle:hover { transform: translateY(-1px); }

/* Back to top button (next to theme toggle) */
.back-to-top { position: fixed; right: 66px; bottom: 16px; width: 44px; height: 44px; border-radius: 12px; background: var(--bg-elev); color: var(--text); border: 1px solid var(--border); box-shadow: var(--shadow-1); display: grid; place-items: center; cursor: pointer; }
.back-to-top:hover { transform: translateY(-1px); }
.back-to-top[hidden] { display: none !important; }
@media (max-width: 520px) { .back-to-top { right: 16px; bottom: 66px; } }

/* Focus styles */
:where(a, button, input, .btn):focus-visible { outline: none; box-shadow: 0 0 0 4px color-mix(in oklab, var(--brand) 35%, transparent); border-color: var(--brand); }