:root {
  --bg: #08090d;
  --surface: #11131a;
  --surface-light: #181b24;
  --text: #f4f5f7;
  --muted: #9da3b2;
  --accent: #8b5cf6;
  --accent-2: #22d3ee;
  --border: rgba(255, 255, 255, 0.09);
  --danger: #fb7185;
  --success: #34d399;
  --max-width: 1180px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

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

button,
input,
select {
  font: inherit;
}

.navbar {
  width: min(var(--max-width), calc(100% - 40px));
  height: 76px;
  margin: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: relative;
  z-index: 20;
}

.logo {
  font-size: 1.35rem;
  font-weight: 850;
  letter-spacing: -0.04em;
}

.logo span {
  color: var(--accent-2);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 30px;
  color: var(--muted);
  font-size: 0.94rem;
}

.nav-links a:hover {
  color: var(--text);
}

.nav-button,
.primary-button {
  background: var(--text);
  color: #08090d !important;
  padding: 11px 18px;
  border-radius: 10px;
  font-weight: 750;
  transition: transform .2s, opacity .2s;
}

.nav-button:hover,
.primary-button:hover {
  transform: translateY(-2px);
  opacity: .92;
}

.menu-button {
  display: none;
  background: transparent;
  color: var(--text);
  border: 0;
  font-size: 1.6rem;
  cursor: pointer;
}

.hero {
  min-height: calc(100vh - 76px);
  width: min(var(--max-width), calc(100% - 40px));
  margin: auto;
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  align-items: center;
  gap: 70px;
  padding: 80px 0 100px;
}

.eyebrow {
  color: var(--accent-2);
  font-size: .75rem;
  font-weight: 800;
  letter-spacing: .16em;
  margin-bottom: 16px;
}

.hero h1 {
  font-size: clamp(3.2rem, 7vw, 6.3rem);
  line-height: .93;
  letter-spacing: -.07em;
  max-width: 720px;
}

.hero h1 span {
  color: var(--accent);
}

.hero-text {
  max-width: 610px;
  color: var(--muted);
  font-size: 1.1rem;
  margin: 28px 0;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.secondary-button {
  border: 1px solid var(--border);
  padding: 11px 18px;
  border-radius: 10px;
  font-weight: 700;
  transition: border-color .2s, transform .2s;
}

.secondary-button:hover {
  border-color: rgba(255,255,255,.25);
  transform: translateY(-2px);
}

.hero-meta {
  display: flex;
  gap: 38px;
  margin-top: 58px;
  flex-wrap: wrap;
}

.hero-meta div {
  display: flex;
  flex-direction: column;
}

.hero-meta strong {
  font-size: 1.15rem;
}

.hero-meta span {
  color: var(--muted);
  font-size: .8rem;
}

.hero-card {
  position: relative;
  min-height: 470px;
  display: grid;
  place-items: center;
  overflow: hidden;
}

.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(1px);
}

.orb-one {
  width: 310px;
  height: 310px;
  background: rgba(139,92,246,.26);
  top: 50px;
  right: 40px;
}

.orb-two {
  width: 180px;
  height: 180px;
  background: rgba(34,211,238,.16);
  bottom: 50px;
  left: 50px;
}

.code-window {
  position: relative;
  width: min(100%, 510px);
  background: rgba(17,19,26,.91);
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: 0 30px 100px rgba(0,0,0,.45);
  overflow: hidden;
  transform: rotate(2deg);
}

.window-bar {
  height: 42px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 0 16px;
}

.window-bar span {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: #3a3d47;
}

.code-window pre {
  padding: 28px;
  overflow-x: auto;
  font-size: .9rem;
  line-height: 1.8;
  color: #d9dce5;
}

.purple { color: #c084fc; }
.green { color: #86efac; }
.orange { color: #fdba74; }
.blue { color: #67e8f9; }

.section {
  width: min(var(--max-width), calc(100% - 40px));
  margin: auto;
  padding: 110px 0;
}

.section-heading {
  max-width: 700px;
  margin-bottom: 50px;
}

.section-heading h2 {
  font-size: clamp(2.3rem, 5vw, 4rem);
  line-height: 1;
  letter-spacing: -.055em;
}

.section-heading > p:last-child {
  color: var(--muted);
  margin-top: 18px;
  max-width: 600px;
}

.feature-grid,
.prize-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.feature-card,
.prize-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 30px;
}

.feature-card {
  min-height: 250px;
}

.icon {
  font-size: 1.8rem;
  margin-bottom: 45px;
}

.feature-card h3,
.prize-card h3 {
  font-size: 1.25rem;
  margin-bottom: 8px;
}

.feature-card p,
.prize-card p {
  color: var(--muted);
  font-size: .92rem;
}

.details {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 0;
}

.detail-box {
  padding: 38px 25px;
  border-right: 1px solid var(--border);
}

.detail-box:last-child {
  border-right: 0;
}

.detail-box span,
.place {
  color: var(--accent-2);
  font-size: .7rem;
  letter-spacing: .13em;
  font-weight: 800;
}

.detail-box strong {
  display: block;
  font-size: 1.1rem;
  margin: 10px 0 3px;
}

.detail-box p {
  color: var(--muted);
  font-size: .8rem;
}

.timeline {
  max-width: 850px;
}

.timeline-item {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 30px;
  padding: 25px 0;
  border-top: 1px solid var(--border);
}

.timeline-item time {
  color: var(--accent-2);
  font-weight: 750;
}

.timeline-item h3 {
  font-size: 1.1rem;
}

.timeline-item p {
  color: var(--muted);
  font-size: .9rem;
  margin-top: 4px;
}

.prize-card {
  position: relative;
}

.prize-card.featured {
  border-color: rgba(139,92,246,.55);
  background: linear-gradient(145deg, rgba(139,92,246,.14), var(--surface));
}

.trophy {
  font-size: 2.2rem;
  margin: 42px 0 22px;
}

.prize-card strong {
  display: block;
  font-size: 1.7rem;
  margin-bottom: 6px;
}

.rules-list {
  max-width: 850px;
}

.rules-list > div {
  display: grid;
  grid-template-columns: 60px 1fr;
  gap: 20px;
  padding: 20px 0;
  border-top: 1px solid var(--border);
}

.rules-list span {
  color: var(--accent);
  font-weight: 800;
}

.rules-list p {
  color: #d4d7df;
}

.register-section {
  width: 100%;
  max-width: none;
  background: var(--surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.register-container {
  width: min(var(--max-width), calc(100% - 40px));
  margin: auto;
  display: grid;
  grid-template-columns: .8fr 1.2fr;
  gap: 80px;
}

.register-intro h2 {
  font-size: clamp(2.6rem, 5vw, 4.5rem);
  line-height: .95;
  letter-spacing: -.06em;
}

.register-intro > p:not(.eyebrow) {
  color: var(--muted);
  max-width: 430px;
  margin: 22px 0 30px;
}

.register-note {
  display: flex;
  gap: 12px;
  margin: 14px 0;
  color: #d9dce5;
  font-size: .9rem;
}

.register-note span {
  color: var(--success);
  font-weight: 800;
}

.registration-form {
  background: var(--bg);
  border: 1px solid var(--border);
  padding: 32px;
  border-radius: 18px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: .83rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.form-group input,
.form-group select {
  width: 100%;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  border-radius: 9px;
  padding: 13px 14px;
  outline: none;
  transition: border-color .2s, box-shadow .2s;
}

.form-group input::placeholder {
  color: #606574;
}

.form-group input:focus,
.form-group select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(139,92,246,.12);
}

.form-group input.invalid,
.form-group select.invalid {
  border-color: var(--danger);
}

.hint {
  display: block;
  color: #727786;
  font-size: .72rem;
  margin-top: 5px;
}

.error {
  display: block;
  color: var(--danger);
  font-size: .72rem;
  min-height: 17px;
  margin-top: 4px;
}

.checkbox-label {
  display: flex !important;
  gap: 10px;
  align-items: flex-start;
  cursor: pointer;
  color: var(--muted);
  font-weight: 500 !important;
}

.checkbox-label input {
  width: 17px;
  height: 17px;
  margin-top: 3px;
  accent-color: var(--accent);
}

.submit-button {
  width: 100%;
  border: 0;
  border-radius: 9px;
  background: var(--text);
  color: var(--bg);
  padding: 14px;
  font-weight: 800;
  cursor: pointer;
  transition: transform .2s, opacity .2s;
}

.submit-button:hover:not(:disabled) {
  transform: translateY(-2px);
}

.submit-button:disabled {
  opacity: .65;
  cursor: not-allowed;
}

.form-message {
  display: none;
  padding: 13px 15px;
  border-radius: 9px;
  margin-top: 16px;
  font-size: .85rem;
}

.form-message.success {
  display: block;
  color: var(--success);
  background: rgba(52,211,153,.08);
  border: 1px solid rgba(52,211,153,.2);
}

.form-message.error-message {
  display: block;
  color: var(--danger);
  background: rgba(251,113,133,.08);
  border: 1px solid rgba(251,113,133,.2);
}

.loader {
  display: inline-block;
  width: 17px;
  height: 17px;
  border: 2px solid rgba(0,0,0,.2);
  border-top-color: #000;
  border-radius: 50%;
  animation: spin .7s linear infinite;
  vertical-align: middle;
}

.hidden {
  display: none;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

footer {
  width: min(var(--max-width), calc(100% - 40px));
  margin: auto;
  padding: 45px 0;
  display: flex;
  justify-content: space-between;
  gap: 20px;
  color: var(--muted);
  font-size: .82rem;
}

footer .logo {
  color: var(--text);
  margin-bottom: 5px;
  display: inline-block;
}

@media (max-width: 850px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 65px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 10px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
  }

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

  .nav-links a {
    padding: 12px;
  }

  .menu-button {
    display: block;
  }

  .hero,
  .register-container {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 55px;
  }

  .hero-card {
    min-height: 350px;
  }

  .feature-grid,
  .prize-grid {
    grid-template-columns: 1fr;
  }

  .details {
    grid-template-columns: 1fr 1fr;
  }

  .detail-box:nth-child(2) {
    border-right: 0;
  }

  .detail-box:nth-child(-n+2) {
    border-bottom: 1px solid var(--border);
  }
}

@media (max-width: 600px) {
  .navbar,
  .hero,
  .section,
  footer,
  .register-container {
    width: min(100% - 28px, var(--max-width));
  }

  .hero h1 {
    font-size: 3.4rem;
  }

  .hero-meta {
    gap: 22px;
  }

  .form-row,
  .details {
    grid-template-columns: 1fr;
  }

  .detail-box {
    border-right: 0;
    border-bottom: 1px solid var(--border);
  }

  .detail-box:last-child {
    border-bottom: 0;
  }

  .timeline-item {
    grid-template-columns: 1fr;
    gap: 5px;
  }

  .registration-form {
    padding: 22px;
  }

  footer {
    flex-direction: column;
  }
}