/* AIXDATA 2026 — CSULB AI Club Datathon
   Brand palette from Figma:
   #173C63  navy
   #FFB520  gold
   #43BE28  green
   Background dark: #0a0f0d
*/

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

/* ── Design tokens ───────────────────────────────────────────────── */
:root {
  --navy:  #173C63;
  --gold:  #FFB520;
  --green: #43BE28;

  /* dark mode defaults */
  --bg:        #0a0f0d;
  --bg2:       #0d1410;
  --text:      #e4ede4;
  --text-dim:  rgba(220,240,220,0.52);
  --border:    rgba(67,190,40,0.18);
  --card-bg:   rgba(23,60,99,0.38);
  --input-bg:  rgba(0,0,0,0.35);
  --faq-bg:    rgba(18,32,18,0.65);
  --nav-blur:  rgba(8,13,10,0.92);

  --banner-h: 34px;
  --nav-h:    64px;

  --font-display: 'Orbitron', monospace;
  --font-title:   'Black Ops One', cursive;
  --font-nav:     'Rajdhani', sans-serif;
  --font-body:    'Barlow', sans-serif;
}

/* ── Light mode variable overrides ──────────────────────────────── */
[data-theme="light"] {
  --bg:       #ffffff;
  --bg2:      #f6f3ff;
  --text:     #0c0c1e;
  --text-dim: rgba(12,12,30,0.52);
  --border:   rgba(108,60,210,0.14);
  --card-bg:  rgba(255,255,255,0.97);
  --input-bg: rgba(255,255,255,1);
  --faq-bg:   rgba(250,248,255,0.98);
  --nav-blur: rgba(255,255,255,0.95);
}

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.65;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a { text-decoration: none; color: inherit; }
ul { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }

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

::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--navy); border-radius: 4px; }

[data-theme="light"] ::-webkit-scrollbar-thumb { background: rgba(110,80,180,0.35); }


/* ── Background canvas ───────────────────────────────────────────── */
#bg-canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}


/* ── Loader ──────────────────────────────────────────────────────── */
#loader {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: #080e0b;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.7s ease, visibility 0.7s ease;
}

#loader.done {
  opacity: 0;
  visibility: hidden;
}

#loader-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.loader-inner {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
}

.loader-mascot {
  position: relative;
  width: 220px;
  height: 220px;
  animation: floatMascot 3s ease-in-out infinite;
}

.loader-ring {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  animation: spinRing 12s linear infinite;
}

.loader-mascot-img {
  position: absolute;
  width: 72%;
  height: 72%;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  object-fit: contain;
}

@keyframes floatMascot {
  0%, 100% { transform: translateY(0); }
  50%       { transform: translateY(-12px); }
}

@keyframes spinRing {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}

.loader-text {
  font-family: var(--font-display);
  font-size: 0.75rem;
  letter-spacing: 0.22em;
  color: rgba(255,255,255,0.65);
}

.loader-bar-wrap {
  width: 180px;
  height: 3px;
  background: rgba(255,255,255,0.08);
  border-radius: 2px;
  overflow: hidden;
}

.loader-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--green), var(--gold));
  border-radius: 2px;
  transition: width 0.1s linear;
}


/* ── Announce Banner ─────────────────────────────────────────────── */
/* Scrolling ticker at the very top — datathon at a glance */
.announce-banner {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--banner-h);
  z-index: 300;
  background: linear-gradient(90deg, #0f3006 0%, #0a2004 50%, #0f3006 100%);
  border-bottom: 1px solid rgba(67,190,40,0.3);
  overflow: hidden;
  display: flex;
  align-items: center;
}

.announce-track {
  display: flex;
  align-items: center;
  white-space: nowrap;
  animation: tickerScroll 36s linear infinite;
  will-change: transform;
}

@keyframes tickerScroll {
  0%   { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

.a-item {
  font-family: var(--font-display);
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.17em;
  color: var(--green);
  text-shadow: 0 0 10px rgba(67,190,40,0.65);
  padding: 0 1.5rem;
  flex-shrink: 0;
}

.a-dot {
  font-size: 0.6rem;
  color: rgba(67,190,40,0.4);
  flex-shrink: 0;
  user-select: none;
}

/* light mode banner */
[data-theme="light"] .announce-banner {
  background: linear-gradient(90deg, #ede8ff 0%, #e8e0ff 50%, #ede8ff 100%);
  border-color: rgba(108,60,210,0.25);
}

[data-theme="light"] .a-item {
  color: #5a18c8;
  text-shadow: none;
}

[data-theme="light"] .a-dot { color: rgba(108,60,210,0.4); }

/* ── Light mode: neutralise dark section overlays ────────────────── */
[data-theme="light"] #schedule,
[data-theme="light"] #tracks,
[data-theme="light"] #speakers,
[data-theme="light"] #team {
  background: none;
}

[data-theme="light"] #about {
  background: none;
}


/* ── Navbar ──────────────────────────────────────────────────────── */
#navbar {
  position: fixed;
  top: var(--banner-h);
  left: 0;
  right: 0;
  height: var(--nav-h);
  z-index: 200;
  display: flex;
  align-items: center;
  transition: background 0.3s, border-color 0.3s, backdrop-filter 0.3s;
  border-bottom: 1px solid transparent;
}

#navbar.scrolled {
  background: var(--nav-blur);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-color: var(--border);
}

.nav-inner {
  width: 100%;
  max-width: 1220px;
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.nav-brand { display: flex; align-items: center; }

.brand-text {
  font-family: var(--font-title);
  font-size: 1.4rem;
  letter-spacing: 0.05em;
  color: var(--green);
  text-shadow: 0 0 14px rgba(67,190,40,0.55);
}

.brand-accent { color: var(--gold); text-shadow: 0 0 14px rgba(255,181,32,0.55); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.15rem;
  flex: 1;
  justify-content: center;
}

.nav-links a {
  font-family: var(--font-nav);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--text-dim);
  padding: 0.4rem 0.9rem;
  border-radius: 6px;
  transition: color 0.2s, background 0.2s;
}

.nav-links a:hover {
  color: var(--green);
  background: rgba(67,190,40,0.08);
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* sun/moon toggle */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: rgba(67,190,40,0.06);
  color: var(--text-dim);
  transition: color 0.2s, background 0.2s, border-color 0.2s;
  flex-shrink: 0;
}

.theme-toggle:hover {
  color: var(--green);
  background: rgba(67,190,40,0.12);
  border-color: rgba(67,190,40,0.4);
}

.theme-toggle svg { width: 15px; height: 15px; pointer-events: none; }

/* show the correct icon per theme */
[data-theme="dark"]  .icon-sun  { display: none; }
[data-theme="light"] .icon-moon { display: none; }

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 6px;
}

.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--green);
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}


/* ── Hero ────────────────────────────────────────────────────────── */
#hero {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: calc(var(--banner-h) + var(--nav-h) + 2rem) 2rem 4rem;
}

.hero-inner {
  max-width: 1220px;
  margin: 0 auto;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.hero-left {
  flex: 1;
  max-width: 560px;
}

.hero-eyebrow {
  font-family: var(--font-display);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  color: var(--gold);
  text-shadow: 0 0 8px rgba(255,181,32,0.4);
  margin-bottom: 0.75rem;
  text-transform: uppercase;
}

.site-title {
  font-family: var(--font-title);
  font-size: clamp(3.8rem, 9.5vw, 7.5rem);
  line-height: 0.95;
  letter-spacing: 0.04em;
  color: var(--green);
  text-shadow: 0 0 35px rgba(67,190,40,0.5), 0 0 70px rgba(67,190,40,0.18);
  margin-bottom: 0.6rem;
}

.title-accent {
  color: var(--gold);
  text-shadow: 0 0 35px rgba(255,181,32,0.5), 0 0 70px rgba(255,181,32,0.18);
}

.hero-sub {
  font-family: var(--font-nav);
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--text-dim);
  margin-bottom: 0.35rem;
  letter-spacing: 0.02em;
}

.hero-date {
  font-family: var(--font-display);
  font-size: clamp(0.75rem, 1.8vw, 0.95rem);
  color: var(--gold);
  letter-spacing: 0.1em;
  margin-bottom: 1.75rem;
  text-shadow: 0 0 8px rgba(255,181,32,0.35);
}

/* ── Flip clock ──────────────────────────────────────────────────── */
.flip-clock {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  margin-bottom: 2rem;
}

.flip-unit {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.45rem;
}

.flip-card {
  width: 78px;
  height: 86px;
  border-radius: 10px;
  background: #0c1610;
  border: 1px solid rgba(67,190,40,0.22);
  box-shadow: 0 4px 18px rgba(0,0,0,0.65), inset 0 1px 0 rgba(255,255,255,0.04);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.flip-card::after {
  content: '';
  position: absolute;
  left: 0; right: 0;
  top: 50%;
  height: 1px;
  background: rgba(0,0,0,0.55);
}

.flip-card::before {
  content: '';
  position: absolute;
  inset: 0 0 50% 0;
  background: rgba(255,255,255,0.025);
}

.fc-face {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
}

.fc-face span {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 700;
  color: #fff;
  line-height: 1;
  letter-spacing: -0.02em;
}

@keyframes flipIn {
  0%   { transform: rotateX(90deg); opacity: 0; }
  60%  { transform: rotateX(-8deg); opacity: 1; }
  100% { transform: rotateX(0deg);  opacity: 1; }
}

.flip-card.flip-anim { animation: flipIn 0.35s cubic-bezier(0.4,0,0.2,1) both; }

.fc-sep {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 700;
  color: rgba(67,190,40,0.45);
  padding-top: 0.3rem;
  line-height: 1;
  user-select: none;
}

.fc-label {
  font-family: var(--font-nav);
  font-size: 0.62rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-dim);
  opacity: 0.7;
}

[data-theme="light"] .flip-card {
  background: #ffffff;
  border-color: rgba(108,60,210,0.18);
  box-shadow: 0 4px 22px rgba(80,40,180,0.1), inset 0 1px 0 rgba(255,255,255,0.9);
}

[data-theme="light"] .fc-face span { color: #182318; }

/* ── Hero CTAs ───────────────────────────────────────────────────── */
.hero-ctas {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

/* Primary 3D button */
.btn-primary {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: #fff;
  background: linear-gradient(180deg, #5cdf3e 0%, #3baa20 40%, #287014 100%);
  border: 2px solid rgba(255,255,255,0.14);
  border-radius: 50px;
  padding: 0.78rem 2.4rem;
  text-shadow: 0 1px 2px rgba(0,0,0,0.35);
  box-shadow:
    0 4px 0 #194a0c,
    0 6px 14px rgba(0,0,0,0.4),
    inset 0 1px 0 rgba(255,255,255,0.22),
    0 0 22px rgba(67,190,40,0.28);
  transition: transform 0.14s ease, box-shadow 0.14s ease;
  cursor: pointer;
  text-decoration: none;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow:
    0 6px 0 #194a0c,
    0 10px 20px rgba(0,0,0,0.4),
    inset 0 1px 0 rgba(255,255,255,0.28),
    0 0 32px rgba(67,190,40,0.38);
}

.btn-primary:active {
  transform: translateY(3px);
  box-shadow: 0 1px 0 #194a0c, inset 0 1px 0 rgba(255,255,255,0.18);
}

.btn-primary.centered-btn {
  display: block;
  width: fit-content;
  margin: 0 auto 2.5rem;
}

.btn-primary.form-submit { margin-top: 1.25rem; }

/* Ghost / secondary button */
.btn-ghost {
  display: inline-block;
  font-family: var(--font-nav);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--text-dim);
  padding: 0.7rem 1.5rem;
  border-radius: 50px;
  border: 1px solid var(--border);
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}

.btn-ghost:hover {
  color: var(--green);
  border-color: rgba(67,190,40,0.5);
  background: rgba(67,190,40,0.06);
}

/* Outline button (sponsors section) */
.btn-outline {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--green);
  border: 1px solid rgba(67,190,40,0.38);
  border-radius: 8px;
  padding: 0.65rem 1.75rem;
  transition: background 0.2s, border-color 0.2s, box-shadow 0.2s;
}

.btn-outline:hover {
  background: rgba(67,190,40,0.08);
  border-color: var(--green);
  box-shadow: 0 0 18px rgba(67,190,40,0.14);
}


/* ── Mascot / hero right ─────────────────────────────────────────── */
.hero-right {
  flex: 1;
  max-width: 440px;
  display: flex;
  justify-content: center;
  align-items: center;
}

.mascot-wrap {
  position: relative;
  width: 360px;
  height: 360px;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: floatHero 4s ease-in-out infinite;
}

@keyframes floatHero {
  0%, 100% { transform: translateY(0) rotate(-2deg); }
  50%       { transform: translateY(-22px) rotate(2deg); }
}

.orbital-ring {
  position: absolute;
  inset: 18px;
  border-radius: 50%;
  border: 2px solid rgba(255,181,32,0.4);
  box-shadow: 0 0 10px rgba(255,181,32,0.25), inset 0 0 10px rgba(255,181,32,0.08);
  animation: spinRing 14s linear infinite;
}

@keyframes spinRing {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}

.mascot-main {
  position: relative;
  z-index: 2;
  width: 370px;
  filter: drop-shadow(0 0 24px rgba(0,200,240,0.5));
}

/* PNG mascot — shown when assets/stingray.png exists */
.mascot-img {
  display: block;
  object-fit: contain;
}

/* SVG fallback — hidden once the real PNG loads */
.mascot-img ~ .mascot-svg-fallback { display: none; }

/* If the PNG fails to load the browser hides .mascot-img via onerror;
   JS in main.js falls back to showing the SVG instead */
.mascot-img.hidden + .mascot-svg-fallback { display: block; }

.mascot-glow {
  position: absolute;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0,200,232,0.1) 0%, transparent 70%);
  z-index: 1;
  pointer-events: none;
}

/* ── Stingray electric animations ────────────────────────────────── */
@keyframes flickerA {
  0%, 100% { opacity: 1; }
  28%       { opacity: 0.3; }
  55%       { opacity: 0.9; }
  72%       { opacity: 0.15; }
  88%       { opacity: 1; }
}

@keyframes flickerB {
  0%, 100% { opacity: 0.7; }
  35%       { opacity: 0.15; }
  62%       { opacity: 0.8; }
  80%       { opacity: 0.25; }
}

@keyframes pulseGold {
  0%, 100% { opacity: 1;    filter: brightness(1); }
  50%       { opacity: 0.55; filter: brightness(1.7); }
}

@keyframes sparkRing {
  0%   { transform: scale(1);   opacity: 0.9; }
  65%  { transform: scale(1.9); opacity: 0.25; }
  100% { transform: scale(2.4); opacity: 0; }
}

.bolt-a { animation: flickerA 1.9s ease-in-out infinite; }
.bolt-b { animation: flickerB 2.4s ease-in-out infinite; animation-delay: 0.45s; }
.bolt-c { animation: pulseGold 1.5s ease-in-out infinite; }

.spark-a { animation: sparkRing 2.1s ease-out infinite; }
.spark-b { animation: sparkRing 2.1s ease-out infinite; animation-delay: 0.7s; }
.spark-c { animation: sparkRing 1.7s ease-out infinite; animation-delay: 0.3s; }

/* Theme mascot swap — navy in dark, purple in light */
.theme-light-img { display: none; }
.theme-dark-img  { display: block; }

[data-theme="light"] .theme-dark-img  { display: none; }
[data-theme="light"] .theme-light-img { display: block; }

[data-theme="light"] .mascot-main {
  filter: drop-shadow(0 0 14px rgba(120,60,180,0.3));
}


/* ── Sections shared ─────────────────────────────────────────────── */
section { position: relative; z-index: 1; }

.section-inner {
  max-width: 1040px;
  margin: 0 auto;
  padding: 5rem 2rem;
}

.section-heading {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 4vw, 2.2rem);
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--text);
  margin-bottom: 1.25rem;
  text-transform: uppercase;
}

.section-heading.centered { text-align: center; }

.section-sub {
  font-size: 0.92rem;
  color: var(--text-dim);
  margin-bottom: 2.5rem;
  max-width: 560px;
  line-height: 1.7;
}

.section-sub.centered { text-align: center; margin: 0 auto 2.5rem; }


/* ── Stats strip ─────────────────────────────────────────────────── */
.stats-strip {
  position: relative;
  z-index: 1;
  background: rgba(23,60,99,0.15);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.stats-inner {
  max-width: 920px;
  margin: 0 auto;
  padding: 2.5rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-around;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
}

.stat-num {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4.5vw, 3rem);
  font-weight: 700;
  color: var(--green);
  text-shadow: 0 0 22px rgba(67,190,40,0.38);
  line-height: 1;
}

.stat-label {
  font-family: var(--font-nav);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-dim);
  opacity: 0.75;
}

.stat-div {
  width: 1px;
  height: 48px;
  background: var(--border);
  flex-shrink: 0;
}


/* ── About section ───────────────────────────────────────────────── */
#about {
  background: linear-gradient(180deg, transparent 0%, rgba(23,60,99,0.12) 50%, transparent 100%);
}

.live-banner {
  font-family: var(--font-nav);
  font-size: clamp(1.2rem, 3vw, 1.7rem);
  font-weight: 700;
  letter-spacing: 0.04em;
  text-align: center;
  margin-bottom: 1.5rem;
  color: var(--text);
}

.live-pulse {
  color: var(--green);
  text-shadow: 0 0 14px rgba(67,190,40,0.7);
  margin-left: 0.35em;
  animation: livePulse 2s ease-in-out infinite;
}

@keyframes livePulse {
  0%, 100% { text-shadow: 0 0 14px rgba(67,190,40,0.7); }
  50%       { text-shadow: 0 0 30px rgba(67,190,40,1), 0 0 60px rgba(67,190,40,0.4); }
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: start;
}

.about-card {
  background: var(--card-bg);
  border: 1px solid rgba(23,60,99,0.6);
  border-radius: 14px;
  padding: 2rem 2.25rem;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--text-dim);
  box-shadow: 0 4px 24px rgba(0,0,0,0.28);
}

.about-card .section-heading { margin-bottom: 1rem; }

.about-highlights {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.highlight-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1rem 1.25rem;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 0.88rem;
}

.hl-icon {
  flex-shrink: 0;
  width: 42px;
  height: 42px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(67,190,40,0.1);
  border: 1px solid rgba(67,190,40,0.22);
  border-radius: 8px;
}

.hl-icon svg {
  width: 20px;
  height: 20px;
  stroke: var(--green);
  flex-shrink: 0;
}

.highlight-item strong {
  display: block;
  font-family: var(--font-nav);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--green);
  margin-bottom: 0.2rem;
}

.highlight-item p {
  color: var(--text-dim);
  line-height: 1.5;
  font-size: 0.85rem;
}

.highlight-item em { font-style: normal; opacity: 0.65; }

/* Registration form */
.signup-form {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 2rem;
  max-width: 760px;
  margin: 0 auto;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1rem;
}

.form-field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.form-field label {
  font-family: var(--font-nav);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.label-opt {
  font-weight: 400;
  text-transform: none;
  opacity: 0.6;
  letter-spacing: 0;
}

.form-field input,
.form-field select {
  background: var(--input-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 0.88rem;
  padding: 0.65rem 0.9rem;
  transition: border-color 0.2s, box-shadow 0.2s;
  -webkit-appearance: none;
  width: 100%;
}

.form-field input::placeholder { color: var(--text-dim); opacity: 0.5; }

.form-field input:focus,
.form-field select:focus {
  outline: none;
  border-color: var(--green);
  box-shadow: 0 0 0 3px rgba(67,190,40,0.12);
}

.form-field select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%2343BE28' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  background-size: 14px;
  padding-right: 2.25rem;
  cursor: pointer;
}

[data-theme="light"] .form-field select option { background: #f0f5f1; color: #182318; }


/* ── Schedule timeline ───────────────────────────────────────────── */
#schedule {
  background: linear-gradient(180deg, transparent, rgba(14,20,14,0.5) 50%, transparent);
}

.timeline {
  max-width: 700px;
  margin: 0 auto;
  position: relative;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 108px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, transparent 0%, var(--border) 10%, var(--border) 90%, transparent 100%);
}

.timeline-item {
  display: grid;
  grid-template-columns: 100px 22px 1fr;
  gap: 0 1.25rem;
  align-items: start;
  margin-bottom: 2.25rem;
}

.tl-time {
  font-family: var(--font-display);
  font-size: 0.68rem;
  font-weight: 700;
  color: var(--gold);
  letter-spacing: 0.04em;
  text-align: right;
  padding-top: 0.1rem;
  white-space: nowrap;
}

.tl-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: rgba(67,190,40,0.2);
  border: 2px solid rgba(67,190,40,0.45);
  margin: 0.15rem auto 0;
  position: relative;
  z-index: 1;
  transition: background 0.2s, box-shadow 0.2s;
}

.timeline-item.highlight .tl-dot {
  background: var(--green);
  border-color: var(--green);
  box-shadow: 0 0 12px rgba(67,190,40,0.5);
}

.tl-content h4 {
  font-family: var(--font-nav);
  font-size: 0.94rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.25rem;
  letter-spacing: 0.01em;
}

.timeline-item.highlight .tl-content h4 { color: var(--green); }

.tl-content p {
  font-size: 0.82rem;
  color: var(--text-dim);
  line-height: 1.65;
}


/* ── Tracks (flip cards) ─────────────────────────────────────────── */
#tracks {
  background: linear-gradient(180deg, transparent, rgba(14,20,14,0.65) 30%, rgba(14,20,14,0.65) 70%, transparent);
}

.track-hint {
  text-align: center;
  font-size: 0.76rem;
  color: var(--text-dim);
  opacity: 0.55;
  letter-spacing: 0.05em;
  margin-bottom: 2.5rem;
}

.tracks-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 2.25rem;
  justify-content: center;
  align-items: center;
}

.track-wrap { perspective: 1000px; }

.track-card {
  width: 220px;
  height: 104px;
  cursor: pointer;
  position: relative;
  animation: floatTrack 3.8s ease-in-out infinite;
}

.track-wrap:nth-child(2) .track-card { animation-delay: 0.7s; }
.track-wrap:nth-child(3) .track-card { animation-delay: 1.3s; width: 190px; }

@keyframes floatTrack {
  0%, 100% { transform: translateY(0); }
  50%       { transform: translateY(-10px); }
}

.track-inner {
  width: 100%;
  height: 100%;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.55s cubic-bezier(0.4,0,0.2,1);
}

.track-card.flipped .track-inner { transform: rotateY(180deg); }
.track-card.flipped { animation: none; height: 210px; }

.track-front,
.track-back {
  position: absolute;
  inset: 0;
  border-radius: 52px;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 1rem 1.5rem;
}

.track-front {
  border: 2px solid rgba(255,255,255,0.12);
  overflow: hidden;
}

/* Supervised — green (primary brand) */
.track-supervised {
  background: linear-gradient(180deg, #52dd30 0%, #30920c 42%, #1c5c08 100%);
  box-shadow:
    0 5px 0 #103504,
    0 8px 22px rgba(0,0,0,0.5),
    inset 0 1px 0 rgba(255,255,255,0.18),
    0 0 28px rgba(67,190,40,0.22);
}

/* Unsupervised — gold (secondary brand) */
.track-unsupervised {
  background: linear-gradient(180deg, #ffd040 0%, #d48a00 42%, #8c5800 100%);
  box-shadow:
    0 5px 0 #5c3800,
    0 8px 22px rgba(0,0,0,0.5),
    inset 0 1px 0 rgba(255,255,255,0.18),
    0 0 28px rgba(255,181,32,0.22);
}

/* Computer Vision — navy/electric blue (tertiary) */
.track-cv {
  background: linear-gradient(180deg, #3a8fd4 0%, #1d5a99 42%, #0d3060 100%);
  box-shadow:
    0 5px 0 #071c40,
    0 8px 22px rgba(0,0,0,0.5),
    inset 0 1px 0 rgba(255,255,255,0.18),
    0 0 28px rgba(23,60,99,0.4);
}

.track-glow {
  position: absolute;
  top: -28px;
  left: 50%;
  transform: translateX(-50%);
  width: 110px;
  height: 72px;
  background: radial-gradient(ellipse, rgba(200,255,180,0.28) 0%, transparent 70%);
  pointer-events: none;
}

.track-front span {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: #fff;
  text-shadow: 0 1px 3px rgba(0,0,0,0.4);
  text-align: center;
  line-height: 1.3;
}

.track-back {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 18px;
  transform: rotateY(180deg);
  text-align: left;
  padding: 1.25rem 1.5rem;
  box-shadow: 0 8px 26px rgba(0,0,0,0.5);
  backdrop-filter: blur(6px);
}

.track-back h3 {
  font-family: var(--font-display);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--green);
  margin-bottom: 0.5rem;
}

.track-back p {
  font-size: 0.76rem;
  color: var(--text-dim);
  line-height: 1.5;
  margin-bottom: 0.75rem;
}

.track-back ul {
  display: flex;
  flex-direction: column;
  gap: 0.28rem;
}

.track-back ul li {
  font-size: 0.74rem;
  color: var(--text-dim);
  padding-left: 0.75rem;
  position: relative;
}

.track-back ul li::before {
  content: '›';
  position: absolute;
  left: 0;
  color: var(--green);
}


/* ── FAQ ─────────────────────────────────────────────────────────── */
#faq {
  background: linear-gradient(180deg, transparent, rgba(23,60,99,0.08) 50%, transparent);
}

.faq-list {
  max-width: 740px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.faq-item {
  background: var(--faq-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  transition: border-color 0.2s;
}

.faq-item:has(.faq-btn[aria-expanded="true"]) {
  border-color: rgba(67,190,40,0.5);
}

.faq-btn {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.25rem;
  font-family: var(--font-nav);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--text);
  text-align: left;
  gap: 1rem;
  background: rgba(67,190,40,0.05);
  transition: background 0.2s, color 0.2s;
}

.faq-btn:hover { background: rgba(67,190,40,0.1); color: var(--green); }

.faq-arrow {
  font-size: 0.68rem;
  color: var(--green);
  transition: transform 0.3s;
  flex-shrink: 0;
}

.faq-btn[aria-expanded="true"] .faq-arrow { transform: rotate(180deg); }

.faq-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease;
}

.faq-body.open { max-height: 220px; }

.faq-body p {
  padding: 0.75rem 1.25rem 1.25rem;
  font-size: 0.86rem;
  color: var(--text-dim);
  line-height: 1.78;
}


/* ── Speakers ────────────────────────────────────────────────────── */
#speakers {
  background: linear-gradient(180deg, transparent, rgba(14,20,14,0.55) 30%, rgba(14,20,14,0.55) 70%, transparent);
}

.speakers-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 2rem;
  justify-content: center;
}

.speaker-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 1.75rem 1.5rem;
  width: 210px;
  text-align: center;
  transition: transform 0.2s, border-color 0.2s, box-shadow 0.2s;
}

.speaker-card:hover {
  transform: translateY(-5px);
  border-color: rgba(67,190,40,0.35);
  box-shadow: 0 10px 30px rgba(0,0,0,0.25);
}

.speaker-avatar {
  width: 120px;
  height: 120px;
  border-radius: 14px;
  overflow: hidden;
  margin: 0 auto 1rem;
  border: 2px solid var(--border);
}

.avatar-placeholder {
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, #173C63 0%, #0d2040 100%);
}

.speaker-name {
  font-family: var(--font-display);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  margin-bottom: 0.25rem;
  color: var(--text);
}

.speaker-org {
  font-size: 0.76rem;
  color: var(--text-dim);
  opacity: 0.7;
}


/* ── Sponsors ────────────────────────────────────────────────────── */
#sponsors {
  background: linear-gradient(180deg, transparent, rgba(23,60,99,0.1) 50%, transparent);
}

.sponsors-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  justify-content: center;
  align-items: center;
}

.sponsor-slot {
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(23,60,99,0.2);
  border: 1px dashed var(--border);
  border-radius: 12px;
  color: var(--text-dim);
  opacity: 0.55;
  font-size: 0.78rem;
  letter-spacing: 0.05em;
  transition: border-color 0.2s, background 0.2s, opacity 0.2s;
}

.sponsor-slot:hover {
  border-style: solid;
  border-color: rgba(67,190,40,0.45);
  background: rgba(23,60,99,0.35);
  opacity: 0.85;
}

.sponsor-slot.large  { width: 290px; height: 92px; font-size: 0.88rem; }
.sponsor-slot.medium { width: 200px; height: 72px; }
.sponsor-slot.small  { width: 145px; height: 58px; font-size: 0.72rem; }


/* ── Team ────────────────────────────────────────────────────────── */
#team {
  background: linear-gradient(180deg, transparent, rgba(14,20,14,0.55) 30%, rgba(14,20,14,0.55) 70%, transparent);
}

.team-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 2rem;
  justify-content: center;
}

.team-member {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.6rem;
  width: 110px;
}

.member-ring {
  width: 82px;
  height: 82px;
  border-radius: 50%;
  overflow: hidden;
  border: 2px solid var(--border);
  background: var(--bg);
  transition: border-color 0.2s, transform 0.2s;
}

.team-member:hover .member-ring {
  border-color: var(--green);
  transform: scale(1.06);
}

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

.member-name {
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text);
  text-align: center;
  line-height: 1.25;
}

.member-role {
  font-family: var(--font-nav);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--green);
  text-align: center;
  line-height: 1.3;
  opacity: 0.85;
}


/* ── Footer ──────────────────────────────────────────────────────── */
footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--border);
  background: rgba(6,10,8,0.85);
  padding: 3.5rem 2rem 0;
}

[data-theme="light"] footer {
  background: rgba(224,238,226,0.9);
}

.footer-inner {
  max-width: 1040px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 2rem;
  justify-content: space-between;
  align-items: flex-start;
  padding-bottom: 2.5rem;
}

.footer-brand p {
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-top: 0.5rem;
  opacity: 0.6;
}

.footer-links,
.footer-socials {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  align-items: center;
}

.footer-links a,
.footer-socials a {
  font-family: var(--font-nav);
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--text-dim);
  transition: color 0.2s;
  opacity: 0.7;
}

.footer-links a:hover,
.footer-socials a:hover {
  color: var(--green);
  opacity: 1;
}

.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 8px;
  transition: color 0.2s, background 0.2s;
}

.social-link svg { width: 18px; height: 18px; }

.social-link:hover {
  color: var(--green);
  background: rgba(67,190,40,0.08);
}

.footer-copy {
  max-width: 1040px;
  margin: 0 auto;
  padding: 1rem 0;
  font-size: 0.72rem;
  color: var(--text-dim);
  text-align: center;
  border-top: 1px solid rgba(255,255,255,0.04);
  opacity: 0.5;
}

.credit-bar {
  max-width: 1040px;
  margin: 0 auto;
  padding: 0.65rem 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4em;
  font-family: var(--font-nav);
  font-size: 0.76rem;
  color: var(--text-dim);
  opacity: 0.4;
}

.credit-name {
  font-weight: 700;
  color: rgba(67,190,40,0.7);
}


/* ── Scroll to top ───────────────────────────────────────────────── */
.scroll-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: rgba(67,190,40,0.1);
  border: 1px solid var(--border);
  color: var(--green);
  font-size: 1.1rem;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s, transform 0.25s, background 0.2s;
}

.scroll-top.visible { opacity: 1; pointer-events: auto; }
.scroll-top:hover { background: rgba(67,190,40,0.2); transform: translateY(-3px); }


/* ── Scroll reveal ───────────────────────────────────────────────── */
.fade-in {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible { opacity: 1; transform: none; }


/* ── Highlight items — light mode ───────────────────────────────── */
[data-theme="light"] .highlight-item {
  background: rgba(255,255,255,0.82);
  border-color: rgba(67,190,40,0.22);
}

[data-theme="light"] .about-card {
  background: rgba(255,255,255,0.98);
  border-color: rgba(108,60,210,0.12);
  box-shadow: 0 8px 40px rgba(80,40,180,0.08);
  color: var(--text);
}

[data-theme="light"] .stats-strip {
  background: rgba(255,255,255,0.9);
  border-color: rgba(108,60,210,0.12);
  box-shadow: 0 1px 0 rgba(108,60,210,0.08), 0 -1px 0 rgba(108,60,210,0.08);
}

[data-theme="light"] .track-back {
  background: rgba(255,255,255,0.97);
  border-color: rgba(108,60,210,0.18);
}

[data-theme="light"] .speaker-card {
  background: rgba(255,255,255,0.98);
  border-color: rgba(108,60,210,0.12);
  box-shadow: 0 4px 24px rgba(80,40,180,0.07);
}

[data-theme="light"] .sponsor-slot {
  background: rgba(108,60,210,0.04);
  border-color: rgba(108,60,210,0.14);
  color: rgba(12,12,30,0.4);
}

[data-theme="light"] .faq-item {
  background: rgba(255,255,255,0.98);
  border-color: rgba(108,60,210,0.12);
  box-shadow: 0 2px 12px rgba(80,40,180,0.05);
}

[data-theme="light"] .faq-item:has(.faq-btn[aria-expanded="true"]) {
  border-color: rgba(108,60,210,0.35);
}

[data-theme="light"] .faq-btn {
  color: var(--text);
  background: transparent;
}

[data-theme="light"] .tl-content h4 { color: var(--text); }
[data-theme="light"] .tl-content p  { color: var(--text-dim); }
[data-theme="light"] .speaker-name  { color: var(--text); }

[data-theme="light"] .signup-form {
  background: rgba(255,255,255,0.98);
  border-color: rgba(108,60,210,0.12);
  box-shadow: 0 8px 40px rgba(80,40,180,0.08);
}

[data-theme="light"] .hl-card {
  background: rgba(255,255,255,0.98);
  border-color: rgba(108,60,210,0.12);
  box-shadow: 0 4px 20px rgba(80,40,180,0.07);
}

[data-theme="light"] .hl-icon {
  background: rgba(108,60,210,0.08);
  border-color: rgba(108,60,210,0.18);
}

[data-theme="light"] .hl-icon svg {
  stroke: #6c3cd2;
}

[data-theme="light"] .hl-label {
  color: #6c3cd2;
}

[data-theme="light"] .member-ring {
  border-color: rgba(108,60,210,0.2);
}

[data-theme="light"] .team-member:hover .member-ring {
  border-color: rgba(108,60,210,0.6);
}

[data-theme="light"] .tl-dot {
  background: rgba(108,60,210,0.2);
  border-color: rgba(108,60,210,0.4);
}

[data-theme="light"] .timeline-item.highlight .tl-dot {
  background: #6c3cd2;
  border-color: #6c3cd2;
  box-shadow: 0 0 12px rgba(108,60,210,0.4);
}

[data-theme="light"] .timeline::before {
  background: linear-gradient(180deg, transparent, rgba(108,60,210,0.25) 20%, rgba(108,60,210,0.25) 80%, transparent);
}

/* ── Smooth section separator lines ─────────────────────────────── */
#about::before,
#tracks::before,
#faq::before,
#speakers::before,
#team::before {
  content: '';
  display: block;
  width: 60px;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--green), transparent);
  margin: 0 auto;
  opacity: 0.4;
}

/* ── Responsive ──────────────────────────────────────────────────── */
@media (max-width: 960px) {
  .hero-inner { flex-direction: column; align-items: flex-start; }
  .hero-right { align-self: center; }
  .mascot-wrap { width: 280px; height: 280px; }
  .about-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: fixed;
    top: calc(var(--banner-h) + var(--nav-h));
    left: 0;
    right: 0;
    background: var(--nav-blur);
    backdrop-filter: blur(14px);
    flex-direction: column;
    padding: 1.5rem;
    gap: 0.25rem;
    border-bottom: 1px solid var(--border);
    z-index: 199;
  }

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

  .form-row { grid-template-columns: 1fr; }
  .tracks-grid { flex-direction: column; align-items: center; }
  .flip-clock { gap: 0.3rem; }
  .flip-card { width: 64px; height: 70px; }
  .fc-face span { font-size: 1.9rem; }
  .fc-sep { font-size: 1.9rem; }
  .section-inner { padding: 3.5rem 1.25rem; }
  .footer-inner { flex-direction: column; gap: 1.5rem; }
  .stat-div { display: none; }
  .stats-inner { justify-content: center; gap: 2rem; }

  .timeline::before { left: 68px; }
  .timeline-item { grid-template-columns: 60px 18px 1fr; gap: 0 0.75rem; }
  .tl-time { font-size: 0.62rem; }
}

@media (max-width: 480px) {
  .flip-card { width: 54px; height: 62px; }
  .fc-face span { font-size: 1.55rem; }
  .fc-sep { font-size: 1.6rem; }
  .mascot-wrap { width: 240px; height: 240px; }
  .mascot-main { width: 220px; }
  .team-member { width: 92px; }
  .member-ring { width: 70px; height: 70px; }

  .timeline::before { display: none; }
  .timeline-item { grid-template-columns: 54px 0 1fr; gap: 0 0.5rem; }
  .tl-dot { display: none; }
  .tl-time { font-size: 0.58rem; }

  .hero-ctas { flex-direction: column; align-items: flex-start; }

  .about-card { padding: 1.5rem; }
}