:root {
  color-scheme: dark;
  --bg: #000;
  --bg-soft: #171717;
  --panel: rgba(23, 23, 23, 0.88);
  --panel-strong: #1a1a1a;
  --text: #fff;
  --muted: #d1d5db;
  --line: rgba(255, 255, 255, 0.16);
  --accent: #f97316;
  --accent-strong: #e8c547;
  --rust: #c2410c;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.55);
  --radius: 24px;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(249, 115, 22, 0.2), transparent 34rem),
    radial-gradient(circle at 82% 10%, rgba(232, 197, 71, 0.12), transparent 30rem),
    radial-gradient(circle at 50% 92%, rgba(194, 65, 12, 0.18), transparent 26rem),
    linear-gradient(145deg, #000 0%, #171717 54%, #000 100%);
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  content: "";
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 54px 54px;
  mask-image: linear-gradient(to bottom, black, transparent 82%);
}

a {
  color: inherit;
}

p {
  color: var(--muted);
  line-height: 1.7;
}

ul {
  margin: 0;
  padding-left: 1.1rem;
  color: var(--muted);
  line-height: 1.75;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 920px;
  margin-bottom: 1.4rem;
  font-size: clamp(3rem, 9vw, 7.4rem);
  line-height: 0.92;
  letter-spacing: -0.075em;
}

h2 {
  margin-bottom: 1rem;
  font-size: clamp(2rem, 4vw, 4rem);
  line-height: 1;
  letter-spacing: -0.055em;
}

h3 {
  margin-bottom: 0.55rem;
  font-size: 1.05rem;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid var(--line);
  background: rgba(0, 0, 0, 0.78);
  backdrop-filter: blur(18px);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  width: min(1180px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 1rem 0;
}

.brand,
.nav-links {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand,
.nav-links a,
.prep-card,
.sponsor-card,
.site-footer a {
  text-decoration: none;
}

.brand {
  font-weight: 800;
  letter-spacing: -0.03em;
}

.nav-links a {
  color: var(--muted);
  font-size: 0.95rem;
  font-weight: 600;
}

.nav-links a:hover,
.site-footer a:hover {
  color: var(--accent);
}

.hero,
.section {
  width: min(1180px, calc(100% - 2rem));
  margin: 0 auto;
}

.hero {
  min-height: calc(100vh - 73px);
  padding: clamp(4rem, 9vw, 8rem) 0 5rem;
  align-items: end;
}

.section {
  padding: clamp(4rem, 8vw, 7rem) 0;
  border-top: 1px solid var(--line);
}

.section-grid,
.split-section,
.register-section {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(320px, 1.1fr);
  gap: clamp(2rem, 6vw, 5rem);
}

.hero.section-grid {
  grid-template-columns: minmax(0, 0.9fr) minmax(320px, 1.1fr);
  gap: clamp(3rem, 8vw, 7rem);
}

.eyebrow,
.card-label,
time {
  color: var(--accent);
  font-family: "JetBrains Mono", monospace;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.hero-text {
  max-width: 700px;
  font-size: clamp(1.1rem, 2vw, 1.35rem);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  margin-top: 2rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3.2rem;
  padding: 0.9rem 1.25rem;
  border: 1px solid transparent;
  border-radius: 999px;
  font: inherit;
  font-weight: 800;
  text-decoration: none;
  cursor: pointer;
  transition: transform 160ms ease, border-color 160ms ease, background 160ms ease;
}

.button:hover {
  transform: translateY(-2px);
}

.button-primary {
  color: #000;
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
}

.button-secondary {
  color: var(--text);
  border-color: var(--line);
  background: rgba(255, 255, 255, 0.05);
}

.event-card,
.topic-grid article,
.feature-list article,
.prep-card,
.sponsor-card,
.prize-card,
.registration-form,
.important-note,
.success-panel,
.contact-box {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: var(--shadow);
}

.event-card {
  display: grid;
  gap: 1rem;
  padding: clamp(1.25rem, 3vw, 2rem);
}

.registration-event-card {
  box-shadow: none;
}

.event-card div {
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--line);
}

.event-card div:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.event-card strong,
.event-card span {
  display: block;
}

.event-card strong {
  margin-top: 0.45rem;
  font-size: 1.15rem;
}

.content-stack,
.feature-list,
.register-copy {
  display: grid;
  gap: 1.25rem;
}

.topic-grid,
.sponsor-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.topic-grid article,
.feature-list article {
  padding: 1.4rem;
}

.prep-card {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
  gap: 0;
  overflow: hidden;
  padding: 0;
  border-color: rgba(232, 197, 71, 0.72);
  background: #e8c547;
  transition: transform 160ms ease, border-color 160ms ease;
}

.prep-card::before {
  position: absolute;
  inset: 0;
  content: "";
  pointer-events: none;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.28), transparent 42%);
}

.prep-card:hover {
  transform: translateY(-3px);
  border-color: rgba(249, 115, 22, 0.92);
}

.prep-card img {
  width: 100%;
  height: 100%;
  min-height: 15rem;
  object-fit: cover;
}

.prep-card-copy {
  position: relative;
  display: grid;
  align-content: center;
  gap: 0.7rem;
  padding: 1.5rem;
  color: #000;
}

.prep-card-copy .card-label,
.prep-card-copy p,
.prep-card-copy strong {
  color: #000;
}

.prep-card p {
  margin-bottom: 0;
}

.prep-card strong {
  text-decoration: underline;
  text-underline-offset: 0.22em;
}

.section-heading {
  max-width: 760px;
  margin-bottom: 2rem;
}

.timeline {
  display: grid;
  gap: 0.85rem;
}

.timeline-item {
  display: grid;
  grid-template-columns: 6rem minmax(0, 1fr);
  gap: 1rem;
  padding: 1.15rem;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.045);
}

.timeline-item p {
  margin-bottom: 0;
}

.timeline-item.featured {
  border-color: rgba(249, 115, 22, 0.55);
  background: linear-gradient(135deg, rgba(249, 115, 22, 0.16), rgba(232, 197, 71, 0.1));
}

.sponsor-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.sponsor-card {
  display: grid;
  min-height: 10rem;
  align-content: space-between;
  padding: 1.5rem;
  transition: transform 160ms ease, border-color 160ms ease;
}

.sponsor-card:hover {
  transform: translateY(-3px);
  border-color: rgba(249, 115, 22, 0.55);
}

.sponsor-card span {
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: -0.04em;
}

.sponsor-image-panel {
  display: grid;
  place-items: center;
  margin-bottom: 1.25rem;
  height: 9rem;
  overflow: hidden;
  padding: 1rem;
  border-radius: 18px;
  background: #000;
}

.sponsor-image-panel-light {
  background: #fff;
}

.sponsor-image-panel-dark {
  background: #000;
}

.sponsor-image-panel img {
  display: block;
  width: auto;
  max-width: 100%;
  max-height: 100%;
  height: auto;
  object-fit: contain;
}

.sponsor-logo-invert img {
  filter: invert(1);
}

.sponsor-image-cover {
  padding: 0;
}

.sponsor-image-cover img {
  width: 100%;
  height: 100%;
  max-width: none;
  max-height: none;
  object-fit: cover;
}

.sponsor-card small {
  color: var(--muted);
  line-height: 1.5;
}

.sponsor-card.muted {
  background: rgba(255, 255, 255, 0.035);
}

.prize-card {
  margin-top: 1rem;
  padding: 1.5rem;
  background: linear-gradient(135deg, rgba(194, 65, 12, 0.18), rgba(232, 197, 71, 0.1));
}

.prize-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.75rem;
}

.prize-grid span {
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: 16px;
  color: var(--text);
  background: rgba(0, 0, 0, 0.18);
  font-weight: 800;
}

.register-section {
  align-items: start;
}

.important-note {
  padding: 1.25rem;
  border-color: rgba(249, 115, 22, 0.55);
  background: linear-gradient(135deg, rgba(249, 115, 22, 0.16), rgba(232, 197, 71, 0.08));
}

.important-note strong {
  display: block;
  margin-bottom: 0.35rem;
  color: var(--accent);
}

.important-note p {
  margin-bottom: 0;
}

.contact-box {
  display: grid;
  gap: 0.25rem;
  padding: 1.25rem;
}

.contact-box span,
.contact-box a {
  color: var(--muted);
}

.registration-form {
  display: grid;
  gap: 1rem;
  padding: clamp(1.25rem, 3vw, 2rem);
}

.form-row {
  display: grid;
  gap: 0.45rem;
}

.bot-field {
  position: absolute;
  left: -10000px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

label {
  font-weight: 700;
}

input,
select,
textarea {
  width: 100%;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 14px;
  color: var(--text);
  background: rgba(0, 0, 0, 0.22);
  font: inherit;
  padding: 0.95rem 1rem;
  outline: none;
}

input:focus,
select:focus,
textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px rgba(249, 115, 22, 0.14);
}

textarea {
  resize: vertical;
}

.checkbox-row {
  grid-template-columns: auto minmax(0, 1fr);
  align-items: start;
}

.checkbox-row input {
  width: 1.2rem;
  height: 1.2rem;
  margin-top: 0.15rem;
}

.form-note {
  min-height: 1.6rem;
  margin-bottom: 0;
  color: var(--accent);
  font-weight: 700;
}

.success-panel {
  display: grid;
  gap: 0.85rem;
  padding: 1.25rem;
  border-color: rgba(232, 197, 71, 0.65);
  background: linear-gradient(135deg, rgba(249, 115, 22, 0.16), rgba(232, 197, 71, 0.1));
}

.success-panel[hidden] {
  display: none;
}

.success-panel p {
  margin-bottom: 0;
}

.calendar-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.site-footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  width: min(1180px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 2rem 0 3rem;
  border-top: 1px solid var(--line);
}

.site-footer p {
  margin-bottom: 0;
}

@media (max-width: 860px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
  }

  .section-grid,
  .hero.section-grid,
  .split-section,
  .register-section,
  .topic-grid,
  .sponsor-grid,
  .prize-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
  }

  .prep-card {
    grid-template-columns: 1fr;
  }

  .prep-card img {
    min-height: 12rem;
  }
}

@media (max-width: 560px) {
  .brand {
    align-items: flex-start;
  }

  .nav-links {
    width: 100%;
    justify-content: space-between;
  }

  .timeline-item {
    grid-template-columns: 1fr;
  }

  .button {
    width: 100%;
  }
}