/*
  RC Cup Shared Styles
  - Dark-first theme per team preference
  - Minimal utility classes
  - Components shared across the 3 design variants
*/

:root {
  --bg-900: #0b0f14;
  --bg-850: #0f141b;
  --bg-800: #121823;
  --bg-700: #1b2432;
  --text-100: #e6edf3;
  --text-200: #c9d1d9;
  --muted-300: #9aa4af;
  --accent: #3b82f6; /* blue */
  --accent-2: #00c2ff; /* cyan */
  --warn: #ffb703;
  --danger: #ff477e;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.45);
  --radius: 16px;
  --glass: rgba(255, 255, 255, 0.06);
  --glass-border: rgba(255, 255, 255, 0.12);
}

/* Light mode removed (dark-only) */

/* Reset */
* { box-sizing: border-box; }
html, body { height: 100%; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Noto Sans, "Helvetica Neue", Arial, "Apple Color Emoji", "Segoe UI Emoji";
  color: var(--text-100);
  background: radial-gradient(1200px 800px at 10% -10%, rgba(59,130,246,0.10), transparent 50%),
              radial-gradient(900px 600px at 110% 10%, rgba(0,194,255,0.10), transparent 50%),
              var(--bg-900);
}

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

.container {
  width: min(1100px, 92%);
  margin: 0 auto;
}
.container.narrow { width: min(780px, 92%); }

/* Header */
header.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: saturate(1.4) blur(10px);
  background: linear-gradient(to bottom, rgba(0,0,0,0.35), rgba(0,0,0,0.0));
  border-bottom: 1px solid var(--glass-border);
}
header .bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 0;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}
.brand .logo {
  width: 36px; height: 36px; border-radius: 10px;
  object-fit: contain; display: block;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 6px 18px rgba(19,255,140,0.35), 0 3px 8px rgba(0,194,255,0.25);
}
.brand strong { letter-spacing: 0.3px; }

nav.main-nav {
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
}
nav.main-nav a {
  padding: 8px 12px;
  border-radius: 10px;
  color: var(--text-200);
  background-image: linear-gradient(currentColor, currentColor);
  background-position: 0 100%;
  background-repeat: no-repeat;
  background-size: 0 2px;
}
nav.main-nav a:hover { background: var(--glass); color: var(--text-100); background-size: 100% 2px; }

/* Mobile nav behavior */
@media (max-width: 720px) {
  header .bar { flex-wrap: wrap; }
  nav.main-nav { display: none; }
  nav.main-nav.open {
    display: flex;
    position: fixed; inset: 60px 0 0 0; z-index: 1200;
    flex-direction: column; gap: 6px; padding: 12px; 
    background: rgba(10, 14, 20, 0.92); backdrop-filter: blur(10px) saturate(1.2);
  }
}

.icon-btn {
  display: inline-flex; align-items: center; justify-content: center;
  width: 38px; height: 38px; border-radius: 12px;
  border: 1px solid var(--glass-border);
  background: var(--glass);
}

/* Buttons */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 12px 18px; border-radius: 14px;
  border: 1px solid var(--glass-border);
  background: linear-gradient(to bottom right, rgba(255,255,255,0.06), rgba(255,255,255,0.02));
  color: var(--text-100);
  box-shadow: var(--shadow);
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn.primary { background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: #061018; border: none; }
.btn.primary:hover { box-shadow: 0 10px 28px rgba(59,130,246,0.35), 0 6px 16px rgba(0,194,255,0.25); }
.btn.primary:hover { box-shadow: 0 10px 28px rgba(59,130,246,0.35), 0 6px 16px rgba(0,194,255,0.25); }
.btn.ghost { background: transparent; }

/* Disabled buttons */
.btn[disabled], .btn:disabled {
  opacity: .55;
  cursor: not-allowed;
  filter: grayscale(.2) saturate(.8);
  box-shadow: none !important;
  transform: none !important;
}

/* Forms - attractive glass inputs */
form.grid { gap: 12px; }
form.grid label { color: var(--text-200); font-weight: 600; display: grid; gap: 6px; }
form.grid input[type="text"],
form.grid input[type="email"],
form.grid select,
form.grid textarea {
  width: 100%;
  padding: 10px 12px;
  border-radius: 16px;
  border: 1px solid var(--glass-border);
  background: linear-gradient(180deg, rgba(255,255,255,0.06), rgba(255,255,255,0.03));
  color: var(--text-100);
  outline: none;
  transition: border-color .2s ease, box-shadow .2s ease, transform .08s ease;
}
form.grid input::placeholder,
form.grid textarea::placeholder { color: var(--muted-300); }
form.grid input:focus,
form.grid select:focus,
form.grid textarea:focus {
  border-color: rgba(0,194,255,0.6);
  box-shadow: 0 0 0 4px rgba(0,194,255,0.12);
}
form.grid select {
  appearance: none;
  -moz-appearance: none;
  -webkit-appearance: none;
  background-clip: padding-box;
  padding-right: 44px;
  min-height: 44px;
  border-radius: 16px;
  border: 1px solid transparent;
  /* arrow + gradient border + inner glass */
  background-image:
    url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='%23c9d1d9'><path d='M7 10l5 5 5-5z'/></svg>"),
    linear-gradient(135deg, rgba(59,130,246,0.35), rgba(0,194,255,0.30)),
    linear-gradient(180deg, rgba(255,255,255,0.06), rgba(255,255,255,0.03));
  background-repeat: no-repeat, no-repeat, no-repeat;
  background-position: calc(100% - 12px) 50%, 0 0, 0 0;
  background-size: 14px, 100% 100%, 100% 100%;
  box-shadow: 0 8px 20px rgba(0,0,0,.25);
}
form.grid select:focus {
  border-color: transparent;
  box-shadow: 0 0 0 4px rgba(59,130,246,0.18), 0 10px 24px rgba(0,0,0,.35);
}
form.grid select option { background: var(--bg-850); color: var(--text-100); }
form.grid select:hover { transform: translateY(-1px); }
form.grid select::-ms-expand { display: none; }
form.grid textarea { resize: vertical; min-height: 120px; }

/* Checkbox polish */
input[type="checkbox"] { accent-color: var(--accent); }
label.terms-agree { align-items: center; gap: 8px; grid-auto-flow: column; justify-content: start; }
label.terms-agree a { color: #60a5fa; text-decoration: underline; }
label.terms-agree a:hover { color: #93c5fd; }

#sponsorFields { display: none; }
#sponsorFields.show { display: contents; }

/* Submit full width on small screens */
@media (max-width: 720px) {
  form.grid .btn[type="submit"] { width: 100%; justify-content: center; }
  .btn, .icon-btn { min-height: 44px; }
  nav.main-nav.open a { padding: 14px 16px; font-size: 18px; }
}

/* Enhanced custom select */
.select-wrapper { position: relative; display: grid; }
.select-display {
  display: flex; align-items: center; gap: 8px; justify-content: space-between;
  padding: 10px 44px 10px 12px; border-radius: 16px; color: var(--text-100);
  border: 1px solid var(--glass-border); width: 100%; min-height: 44px;
  background: linear-gradient(135deg, rgba(59,130,246,0.10), rgba(0,194,255,0.08)),
              linear-gradient(180deg, rgba(255,255,255,0.06), rgba(255,255,255,0.03));
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.select-display .option-icon { flex: 0 0 auto; margin-right: 6px; }
.select-display .option-label { flex: 1 1 auto; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.select-display::after { content: ""; position: absolute; right: 12px; top: 50%; width: 14px; height: 14px; transform: translateY(-50%);
  background: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='%23c9d1d9'><path d='M7 10l5 5 5-5z'/></svg>") no-repeat center/14px; opacity: .9; }
.select-list { position: absolute; z-index: 1500; left: 0; right: 0; top: calc(100% + 6px); display: none; padding: 6px; border-radius: 14px; border: 1px solid var(--glass-border);
  background: rgba(10,14,20,.94); backdrop-filter: blur(10px) saturate(1.2); box-shadow: 0 18px 40px rgba(0,0,0,.45); max-height: 260px; overflow: auto;
  transform: scaleY(.96); transform-origin: 50% 0; opacity: 0; transition: transform .14s cubic-bezier(.2,.7,.1,1), opacity .14s ease; }
.select-list.open { display: block; opacity: 1; transform: scaleY(1); }
.select-display.open { box-shadow: 0 0 0 4px rgba(59,130,246,0.18), 0 10px 24px rgba(0,0,0,.35); }
.select-option { padding: 8px 10px; border-radius: 10px; color: var(--text-100); cursor: pointer; transition: transform .12s ease; }
.select-option .option-icon { margin-right: 8px; }
.select-option.highlight { outline: 2px solid rgba(59,130,246,.5); }
.select-option:hover { transform: translateX(2px); }

/* Pulse when selecting */
.select-display.pulse { animation: selectPulse .28s ease; }
@keyframes selectPulse { 0% { transform: scale(.98); } 50% { transform: scale(1.02); } 100% { transform: scale(1); } }
.select-option[aria-selected="true"] { background: linear-gradient(135deg, rgba(59,130,246,0.20), rgba(0,194,255,0.18)); }
.select-option:hover { background: var(--glass); }

/* Hero */
.hero {
  position: relative;
  padding: 72px 0 48px;
}
.hero h1 {
  font-size: clamp(32px, 4.5vw, 56px);
  line-height: 1.05;
  margin: 0 0 14px;
}
.hero p.lead {
  color: var(--muted-300);
  font-size: clamp(16px, 1.8vw, 20px);
  margin: 0 0 24px;
}
.hero .cta { display: flex; gap: 12px; flex-wrap: wrap; }

.glow-orb {
  position: absolute; inset: -120px -80px auto auto; pointer-events: none;
  width: 360px; height: 360px; border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, rgba(59,130,246,0.40), transparent 60%),
              radial-gradient(circle at 70% 70%, rgba(0,194,255,0.40), transparent 60%);
  filter: blur(20px); opacity: 0.6;
}

/* Sections */
section { padding: 56px 0; }
section h2 { font-size: clamp(26px, 3.4vw, 34px); margin: 0 0 10px; }
section .kicker { color: var(--accent); text-transform: uppercase; letter-spacing: .12em; font-weight: 600; font-size: 12px; opacity: .9; margin-bottom: 6px; display: inline-block; }
section .sub { color: var(--muted-300); margin: 0 0 18px; }
section .muted { color: var(--muted-300); }
section[id] { scroll-margin-top: 80px; }

/* Grid helpers */
.grid { display: grid; gap: 16px; }
.grid.cols-2 { grid-template-columns: repeat(2, minmax(0,1fr)); }
.grid.cols-3 { grid-template-columns: repeat(3, minmax(0,1fr)); }
.grid.responsive-1 { grid-template-columns: 1fr; }
@media (min-width: 780px) { .grid.responsive-1 { grid-template-columns: repeat(2,1fr); } }
@media (min-width: 980px) { .grid.responsive-1.cols-3 { grid-template-columns: repeat(3,1fr); } }

/* Cards */
.card {
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
}
.card:hover { transform: translateY(-2px); }

/* Gallery thumbnails */
.thumb { display: grid; place-items: center; min-height: 140px; overflow: hidden; }
.thumb img { width: 100%; height: 100%; object-fit: cover; border-radius: 12px; opacity: .9; transition: transform .25s ease, opacity .25s ease; }
.thumb:hover img { transform: scale(1.03); opacity: 1; }

/* Tabs */
.tabs { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 12px; }
.tab { padding: 8px 12px; border-radius: 10px; border: 1px solid var(--glass-border); background: var(--glass); cursor: pointer; }
.tab[aria-selected="true"] { background: linear-gradient(135deg, rgba(19,255,140,0.2), rgba(0,194,255,0.2)); border-color: transparent; }

/* Timeline */
.timeline { position: relative; }
.timeline::before { content: ""; position: absolute; left: 10px; top: 0; bottom: 0; width: 2px; background: linear-gradient(var(--accent), var(--accent-2)); }
.timeline .item { position: relative; padding-left: 36px; margin: 18px 0; }
.timeline .item::before { content: ""; position: absolute; left: 3px; top: 2px; width: 16px; height: 16px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 2px rgba(19,255,140,0.25); }

/* Sponsors grid */
.sponsors { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); }
.sponsor {
  background: var(--bg-850);
  border: 1px solid var(--glass-border);
  border-radius: 14px; padding: 14px; display: grid; place-items: center;
  min-height: 88px;
}
.sponsor:hover { outline: 2px solid rgba(59,130,246,0.45); }
.sponsor img { max-height: 120px; max-width: 100%; width: auto; height: auto; object-fit: contain; filter: saturate(0.9) contrast(1.05); }

/* Make sponsor cards as large as gallery cards */
.carousel-item.sponsor {
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 20px;
  min-height: 140px;
}

/* Footer */
footer.site-footer { color: var(--muted-300); border-top: 1px solid var(--glass-border); padding: 26px 0 48px; margin-top: 24px; }

/* Glass helpers */
.glass { background: var(--glass); border: 1px solid var(--glass-border); border-radius: var(--radius); }
.blur { backdrop-filter: blur(10px) saturate(1.2); }

/* Utility */
.center { display: grid; place-items: center; }
.row { display: flex; gap: 12px; flex-wrap: wrap; }
.row.center { justify-content: center; }
.center-text { text-align: center; }
.muted { color: var(--muted-300); }
.accent { color: var(--accent); }
.hidden { display: none !important; }

/* Design 3 specific helper */
.frosted {
  background: linear-gradient(180deg, rgba(255,255,255,0.08), rgba(255,255,255,0.02));
  border: 1px solid var(--glass-border);
  border-radius: 18px;
  box-shadow: 0 10px 40px rgba(0,0,0,0.35);
}

/* Active nav link */
nav.main-nav a.active { background: var(--glass); color: var(--text-100); }

/* Scroll progress bar */
.scroll-progress {
  position: fixed; inset: 0 auto auto 0; height: 3px; width: 100%; transform: scaleX(0); transform-origin: 0 0; z-index: 2000;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  box-shadow: 0 3px 8px rgba(0,0,0,0.15);
}

/* Carousel */
.carousel { position: relative; }
.carousel-viewport { overflow: hidden; }
.carousel-track { display: flex; gap: 12px; transition: transform .5s cubic-bezier(.2,.7,.1,1); will-change: transform; }
.carousel-item { min-width: clamp(240px, 33%, 360px); }
.carousel-nav { display: contents; }
.carousel-prev, .carousel-next {
  position: absolute; top: 50%; transform: translateY(-50%);
  width: 36px; height: 36px; border-radius: 50%; border: 1px solid var(--glass-border);
  background: var(--glass); color: var(--text-100);
}
.carousel-prev { left: -8px; }
.carousel-next { right: -8px; }

/* Lightbox */
.lightbox-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.8); display: grid; place-items: center; z-index: 3000;
}
.lightbox-inner { position: relative; max-width: 92vw; max-height: 88vh; }
.lightbox-image { max-width: 100%; max-height: 88vh; border-radius: 10px; box-shadow: 0 20px 60px rgba(0,0,0,0.6); }
.lightbox-close, .lightbox-arrow {
  position: absolute; top: 10px; background: rgba(0,0,0,0.5); color: #fff; border: 1px solid rgba(255,255,255,0.2);
  width: 36px; height: 36px; border-radius: 8px; display: grid; place-items: center;
}
.lightbox-close { right: 10px; }
.lightbox-arrow.left { left: 10px; top: 50%; transform: translateY(-50%); }
.lightbox-arrow.right { right: 10px; top: 50%; transform: translateY(-50%); }

/* Chips (filters) */
.chips { display: flex; gap: 8px; flex-wrap: wrap; margin: 8px 0 14px; }
.chip { padding: 8px 12px; border-radius: 999px; border: 1px solid var(--glass-border); background: var(--glass); cursor: pointer; }
.chip[aria-pressed="true"] { background: linear-gradient(135deg, rgba(19,255,140,0.18), rgba(0,194,255,0.18)); border-color: transparent; }

/* Ripple effect */
.ripple-container { position: relative; overflow: hidden; }
.ripple {
  position: absolute; border-radius: 50%; transform: translate(-50%, -50%); pointer-events: none; opacity: 0.35;
  background: currentColor; filter: saturate(0) brightness(2);
  animation: ripple .6s ease-out forwards;
}
@keyframes ripple { from { width: 0; height: 0; opacity: 0.35; } to { width: 240px; height: 240px; opacity: 0; } }

/* Global polish */
body { animation: fadeIn .5s ease both; }
@keyframes fadeIn { from { opacity: 0 } to { opacity: 1 } }

.section-divider { height: 1px; width: 100%; margin: 28px 0 0; background: linear-gradient(90deg, transparent, rgba(0,194,255,0.4), rgba(59,130,246,0.5), transparent); }

.card { transition: transform .2s ease, box-shadow .2s ease; }
.card:hover { transform: translateY(-2px) scale(1.01); box-shadow: 0 18px 40px rgba(0,0,0,.45); }

.carousel-item { transition: transform .2s ease; }
.carousel-item:hover { transform: translateY(-2px) scale(1.02); }

/* Back to top button */
.back-to-top {
  position: fixed; right: 16px; bottom: 16px; width: 42px; height: 42px;
  border-radius: 50%; border: 1px solid var(--glass-border); background: var(--glass);
  color: var(--text-100); box-shadow: var(--shadow); opacity: 0; pointer-events: none;
  transition: opacity .2s ease, transform .2s ease;
}
.back-to-top.visible { opacity: 1; pointer-events: auto; transform: translateY(-2px); }

/* Stagger reveal helper */
.stagger { opacity: 0; transform: translateY(10px); transition: all .6s cubic-bezier(.2,.7,.1,1); }
.stagger.revealed { opacity: 1; transform: none; }

/* Zebra alt section backgrounds */
.section-alt { background: linear-gradient(180deg, rgba(255,255,255,0.03), rgba(255,255,255,0.00)); border-top: 1px solid var(--glass-border); border-bottom: 1px solid var(--glass-border); }

/* Badges */
.badge { display: inline-block; padding: 4px 8px; border-radius: 999px; border: 1px solid var(--glass-border); background: var(--glass); font-size: 12px; color: var(--text-200); transition: box-shadow .2s ease, transform .2s ease; }
.badge.accent { border: none; background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: #061018; }
.badge.gold { border: none; background: linear-gradient(135deg, #f59e0b, #ffd54a); color: #1a1305; }
.badge.gold:hover { box-shadow: 0 0 14px rgba(245,158,11,.45), 0 0 6px rgba(255,213,74,.35); transform: translateY(-1px); }
.badge.diamond { border: none; background: linear-gradient(135deg, #67e8f9, #a5f3fc); color: #061018; }
.badge.diamond:hover { box-shadow: 0 0 18px rgba(59,130,246,.55), 0 0 10px rgba(0,194,255,.45); transform: translateY(-1px); }

/* Quick links */
.quick-links { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 10px; }
.quick-links a { padding: 8px 12px; border-radius: 999px; border: 1px solid var(--glass-border); background: var(--glass); color: var(--text-200); }
.quick-links a:hover { color: var(--text-100); background: linear-gradient(135deg, rgba(59,130,246,0.18), rgba(0,194,255,0.18)); border-color: transparent; }
label.terms-agree a { color: #60a5fa; text-decoration: underline; }
label.terms-agree a:hover { color: #93c5fd; }

/* Mobile polish */
@media (max-width: 720px) {
  .hero { padding: 56px 0 36px; }
  section { padding: 44px 0; }
  .grid { gap: 12px; }
  .card { padding: 16px; }
  .quick-links { overflow-x: auto; flex-wrap: nowrap; scrollbar-width: none; }
  .quick-links::-webkit-scrollbar { display: none; }
  /* Make hero CTA full width stack */
  .hero .cta, .row.center { justify-content: stretch; }
  .hero .cta .btn, .row.center .btn { width: 100%; }
  /* Reduce heavy visuals */
  .glow-orb { display: none; }
  .carousel-prev, .carousel-next { display: none; }
  .carousel-item { min-width: 80%; }
}

/* Scroll lock when mobile nav open */
body.scroll-locked { overflow: hidden; }