:root {
  color-scheme: dark;
  --bg: #0b0f14;
  --bg-alt: #111722;
  --surface: #141c28;
  --surface-2: #1a2332;
  --text: #e6edf3;
  --muted: #98a6b3;
  --accent: #52f7d0;
  --accent-2: #44c9ff;
  --shadow: rgba(0, 0, 0, 0.45);
  --radius: 14px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
  background: radial-gradient(circle at top, rgba(68, 201, 255, 0.08), transparent 55%),
    radial-gradient(circle at 20% 20%, rgba(82, 247, 208, 0.08), transparent 45%),
    var(--bg);
  color: var(--text);
  line-height: 1.6;
  letter-spacing: 0.2px;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image: linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 2px 2px;
  opacity: 0.25;
  pointer-events: none;
  mix-blend-mode: screen;
  z-index: 0;
}

main, header, footer {
  position: relative;
  z-index: 1;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
}

.section {
  padding: 96px 8vw;
}

.section-header {
  max-width: 640px;
  margin-bottom: 32px;
}

.section-header h2 {
  font-size: clamp(1.8rem, 2.4vw, 2.5rem);
  letter-spacing: 1.5px;
  margin: 0 0 12px;
}

.section-header p {
  color: var(--muted);
  margin: 0;
}

.section-header .about-subheading {
  color: var(--muted);
  font-size: clamp(1.04rem, 1.45vw, 1.2rem);
  font-weight: 600;
  letter-spacing: 0.4px;
  margin: 2px 0 14px;
}

.section-header p a,
.accordion-panel a {
  color: var(--accent-2);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color 0.2s ease;
}

.section-header p a:hover,
.section-header p a:focus,
.accordion-panel a:hover,
.accordion-panel a:focus {
  color: var(--accent);
}

.site-header {
  position: sticky;
  top: 0;
  background: rgba(10, 14, 20, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  z-index: 10;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 8vw;
  gap: 24px;
}

.logo {
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  gap: 20px;
  font-size: 0.95rem;
}

.nav-links a {
  color: var(--muted);
  transition: color 0.2s ease, text-shadow 0.2s ease;
}

.nav-links a:hover,
.nav-links a:focus {
  color: var(--text);
  text-shadow: 0 0 8px rgba(82, 247, 208, 0.6);
}

.nav-toggle {
  display: none;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 8px;
  padding: 8px;
}

.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--text);
  margin: 4px 0;
}

.hero {
  position: relative;
  padding: 110px 8vw 80px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 48px;
  align-items: center;
  isolation: isolate;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(to bottom, rgba(7, 12, 19, 0.5), rgba(7, 12, 19, 0.72)),
    linear-gradient(to right, rgba(7, 12, 19, 0.45), rgba(7, 12, 19, 0.25)),
    url("assets/university-hero.png");
  background-size: cover;
  background-repeat: no-repeat;
  background-position: center 36%;
  filter: saturate(0.82) contrast(0.88) brightness(0.82);
  transform: scale(1.03);
  transform-origin: center;
  opacity: 0.82;
  z-index: -1;
  pointer-events: none;
}

.hero-content,
.hero-terminal {
  position: relative;
  z-index: 1;
}

.eyebrow {
  color: var(--accent-2);
  letter-spacing: 2px;
  text-transform: uppercase;
  font-size: 0.75rem;
  margin-bottom: 16px;
}

.hero .eyebrow {
  font-size: clamp(0.95rem, 2.2vw, 1.5rem);
}

.prize-teaser {
  display: inline-flex;
  flex-direction: column;
  gap: 10px;
  max-width: 34rem;
  margin: 0 0 20px;
  padding: 14px 18px;
  border: 1px solid rgba(255, 209, 102, 0.35);
  border-radius: 20px;
  background:
    linear-gradient(135deg, rgba(255, 209, 102, 0.18), rgba(255, 130, 92, 0.1)),
    rgba(9, 14, 21, 0.72);
  box-shadow: 0 18px 36px rgba(0, 0, 0, 0.24);
  backdrop-filter: blur(10px);
}

.prize-teaser-badge {
  display: inline-flex;
  align-self: flex-start;
  align-items: center;
  padding: 6px 12px;
  border-radius: 999px;
  background: rgba(255, 209, 102, 0.16);
  color: #ffd166;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 1.2px;
  text-transform: uppercase;
}

.prize-teaser p {
  margin: 0;
  color: #fff5dd;
  font-size: clamp(1rem, 1.5vw, 1.15rem);
  line-height: 1.45;
}

.prize-teaser strong {
  color: #ffd166;
  font-size: 1.15em;
}

.registration-deadline {
  margin-top: -8px;
  margin-bottom: 20px;
  letter-spacing: 1.4px;
  opacity: 0.86;
}

.hero .registration-deadline {
  font-size: clamp(0.72rem, 1.5vw, 1rem);
}

.hero h1 {
  font-size: clamp(2.8rem, 5vw, 4.5rem);
  letter-spacing: 3px;
  margin: 0 0 12px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 20px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 22px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 600;
  letter-spacing: 0.6px;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border 0.2s ease;
}

.btn.primary {
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
  color: #041016;
  box-shadow: 0 12px 24px rgba(82, 247, 208, 0.25);
}

.btn.primary:hover,
.btn.primary:focus {
  transform: translateY(-2px);
  box-shadow: 0 16px 32px rgba(82, 247, 208, 0.35);
}

.btn.ghost {
  border-color: rgba(82, 247, 208, 0.4);
  color: var(--text);
  background: rgba(82, 247, 208, 0.08);
}

.btn.ghost:hover,
.btn.ghost:focus {
  border-color: var(--accent);
  box-shadow: 0 0 12px rgba(82, 247, 208, 0.3);
}

.hero-note {
  color: var(--muted);
  margin: 0;
}

.hero-terminal {
  position: relative;
  background: linear-gradient(160deg, rgba(20, 30, 46, 0.9), rgba(12, 16, 24, 0.9));
  border: 1px solid rgba(82, 247, 208, 0.2);
  border-radius: var(--radius);
  box-shadow: 0 20px 40px var(--shadow);
  overflow: hidden;
  min-height: 260px;
}

.scanline {
  position: absolute;
  inset: 0;
  background: linear-gradient(transparent, rgba(82, 247, 208, 0.06), transparent);
  animation: scan 5s linear infinite;
  pointer-events: none;
  opacity: 0.6;
}

@keyframes scan {
  0% { transform: translateY(-100%); }
  100% { transform: translateY(100%); }
}

.terminal-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background: rgba(8, 12, 18, 0.8);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
}

.dot.red { background: #ff5f57; }
.dot.yellow { background: #febc2e; }
.dot.green { background: #28c840; }

.terminal-title {
  margin-left: auto;
  font-size: 0.8rem;
  color: var(--muted);
}

.terminal-body {
  padding: 20px;
  font-family: "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;
  font-size: 0.95rem;
  color: #b9f7e9;
  min-height: 200px;
}

.terminal-line {
  margin: 0 0 6px;
  opacity: 0.35;
}

.terminal-rotate {
  margin: 16px 0 0;
  color: var(--accent);
  font-weight: 600;
}

.about {
  background: var(--bg-alt);
}

.challenge-intro {
  max-width: 760px;
}

.challenge-intro .eyebrow {
  margin: 0 0 10px;
}

.challenge {
  max-width: 980px;
  margin: 0 auto;
}

.challenge-card {
  max-width: 760px;
  padding: 24px;
  margin-bottom: 18px;
  border-radius: var(--radius);
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: var(--surface);
}

.challenge-card h3 {
  margin: 0 0 10px;
  letter-spacing: 0.6px;
}

.challenge-card p {
  margin: 0 0 12px;
  color: var(--muted);
}

.challenge-card .challenge-subheading {
  font-size: clamp(1.02rem, 1.4vw, 1.16rem);
  font-weight: 600;
  color: var(--text);
  margin: 4px 0 10px;
}

.challenge-card ul {
  margin: 0;
  padding-left: 20px;
  color: var(--muted);
}

.challenge-card li + li {
  margin-top: 8px;
}

.challenge-card a {
  color: var(--accent-2);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.challenge-card a:hover,
.challenge-card a:focus {
  color: var(--accent);
}

.challenge-outro {
  margin-top: 10px;
}

.schedule-grid {
  display: grid;
  gap: 24px;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.schedule-card {
  background: var(--surface-2);
  padding: 24px;
  border-radius: var(--radius);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.schedule-card h3 {
  margin-top: 0;
  letter-spacing: 1px;
}

.schedule-card ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.schedule-card li {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  padding: 10px 0;
  color: var(--muted);
}

.schedule-card li span {
  color: var(--text);
  font-weight: 600;
}

.prize-grid {
  display: grid;
  gap: 20px;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

.prize-card {
  background: linear-gradient(140deg, rgba(20, 32, 48, 0.95), rgba(16, 24, 36, 0.9));
  padding: 24px;
  border-radius: var(--radius);
  border: 1px solid rgba(82, 247, 208, 0.18);
  text-align: left;
}

.prize-card.minor {
  border-color: rgba(68, 201, 255, 0.2);
}

.prize-amount {
  color: var(--accent);
  font-weight: 600;
}

.faq {
  background: var(--bg-alt);
}

.accordion {
  max-width: 760px;
}

.accordion-item {
  width: 100%;
  background: var(--surface);
  color: var(--text);
  border: 1px solid rgba(255, 255, 255, 0.08);
  padding: 16px 20px;
  margin-top: 12px;
  border-radius: 12px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 1rem;
  cursor: pointer;
}

.accordion-item:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.accordion-panel {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.2s ease;
  padding: 0 20px;
  color: var(--muted);
}

.accordion-panel.open {
  padding: 12px 20px 16px;
}

.sponsor-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 16px;
}

.sponsor-card {
  border: 1px dashed rgba(82, 247, 208, 0.4);
  padding: 18px;
  text-align: center;
  border-radius: 12px;
  color: var(--muted);
  background: rgba(12, 18, 26, 0.5);
}

.code-of-conduct-card {
  max-width: 720px;
  padding: 24px;
  border-radius: var(--radius);
  border: 1px solid rgba(82, 247, 208, 0.16);
  background: var(--surface);
}

.footer {
  padding: 40px 8vw 60px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  color: var(--muted);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 16px;
}

.footer a:hover,
.footer a:focus {
  color: var(--text);
}

@media (max-width: 900px) {
  .nav {
    flex-wrap: wrap;
  }

  .nav-toggle {
    display: inline-flex;
    margin-left: auto;
  }

  .nav-links {
    width: 100%;
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    display: none;
  }

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

@media (max-width: 600px) {
  .section {
    padding: 72px 6vw;
  }

  .hero {
    padding: 96px 6vw 72px;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .prize-teaser {
    max-width: none;
    padding: 14px 16px;
  }
}