/* ============================================================
   ZeroXarena × CICRA Campus 2.0
   Clean, simple, scrolling single-page layout.
   ============================================================ */

:root {
  --bg:        #0A1128;
  --bg-2:      #0E1733;
  --panel:     #142042;
  --panel-2:   #18244A;
  --line:      rgba(255,255,255,0.08);
  --line-2:    rgba(0,229,199,0.18);
  --text:      #FFFFFF;
  --mute:      #9AB0D9;
  --mute-2:    #6F86B5;
  --teal:      #00E5C7;
  --cyan:      #22D3EE;
  --yellow:    #FFE44D;
  --gold:      #FFD24A;
  --silver:    #C7D2E8;
  --bronze:    #E08A4A;

  --radius:    12px;
  --radius-sm: 8px;

  --font-display: 'Barlow Condensed', system-ui, sans-serif;
  --font-ui:      'Barlow Condensed', system-ui, sans-serif;
  --font-mono:    'Space Mono', 'JetBrains Mono', ui-monospace, monospace;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--font-ui);
  font-weight: 400;
  color: var(--text);
  background: var(--bg);
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  line-height: 1.55;
}
img { max-width: 100%; display: block; }
a { color: var(--cyan); text-decoration: none; transition: color .2s; }
a:hover { color: var(--teal); }
button { font-family: inherit; cursor: pointer; }

kbd {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  background: rgba(255,255,255,.06);
  border: 1px solid var(--line-2);
  color: var(--text);
  padding: 1px 6px;
  border-radius: 4px;
  margin: 0 1px;
}

.container {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

.muted   { color: var(--mute); font-weight: 600; }
.accent  { color: var(--teal); }

/* ---------- NAV ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px;
  padding: 14px 28px;
  background: rgba(10,17,40,0.85);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 12px; color: var(--text); }
.brand__logo { width: 36px; height: 36px; border-radius: 8px; }
.brand__text { display: flex; flex-direction: column; line-height: 1; }
.brand__title {
  font-family: var(--font-display); font-weight: 800;
  font-size: 18px; letter-spacing: 1px;
}
.brand__sub { font-family: var(--font-mono); font-size: 10px; color: var(--mute); margin-top: 4px; letter-spacing: 1px; }

.nav__links {
  display: flex; gap: 28px;
  font-family: var(--font-display); font-weight: 600;
  text-transform: uppercase; letter-spacing: 1.5px; font-size: 13px;
}
.nav__links a { color: var(--mute); }
.nav__links a:hover { color: var(--text); }
.nav__cta { display: inline-flex; }

/* ---------- BUTTONS ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line-2);
  background: rgba(255,255,255,0.03);
  color: var(--text);
  font-family: var(--font-display);
  font-weight: 700; letter-spacing: 1.5px;
  text-transform: uppercase; font-size: 13px;
  transition: transform .15s ease, background .2s ease, border-color .2s ease, box-shadow .2s ease, color .2s ease;
}
.btn:hover { transform: translateY(-1px); border-color: var(--teal); color: var(--teal); }
.btn--primary {
  background: var(--teal);
  color: #061021;
  border-color: var(--teal);
  box-shadow: 0 0 0 0 rgba(0,229,199,0.5);
}
.btn--primary:hover {
  background: #1aeed1;
  color: #061021;
  box-shadow: 0 0 24px rgba(0,229,199,0.45);
}
.btn--ghost { background: transparent; color: var(--mute); border-color: var(--line); }
.btn--ghost:hover { color: var(--text); border-color: var(--text); }
.btn--sm { padding: 9px 16px; font-size: 12px; }
.btn--lg { padding: 16px 28px; font-size: 14px; }

/* ---------- HERO ---------- */
.hero { position: relative; padding: 80px 0 100px; overflow: hidden; }
.hero__bg { position: absolute; inset: 0; pointer-events: none; }
.hero__grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(0,229,199,0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,229,199,0.06) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
}
.hero__glow {
  position: absolute; top: -200px; right: -200px;
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(0,229,199,0.20), transparent 60%);
  filter: blur(20px);
}

.hero__inner { position: relative; z-index: 1; }
.eyebrow {
  font-family: var(--font-mono); font-size: 12px; letter-spacing: 2px;
  color: var(--mute); text-transform: uppercase;
  display: inline-flex; align-items: center; gap: 8px;
  margin: 0 0 18px;
}
.dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--teal); box-shadow: 0 0 12px var(--teal);
  animation: pulse 1.6s infinite ease-in-out;
}
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:.4} }

.hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.6rem, 8vw, 5.6rem);
  line-height: 1;
  letter-spacing: 1px;
  margin: 0 0 24px;
  text-transform: uppercase;
}
.hero__title .accent {
  display: inline-block;
  color: var(--teal);
}
.hero__lede {
  font-size: clamp(1rem, 1.5vw, 1.15rem);
  color: var(--mute);
  max-width: 640px;
  margin: 0 0 32px;
}
.hero__lede b { color: var(--text); }

.hero__meta {
  display: grid;
  grid-template-columns: repeat(4, minmax(140px, 1fr));
  gap: 14px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 18px 0;
  margin: 0 0 32px;
}
.hero__meta > div { display: flex; flex-direction: column; gap: 4px; }
.meta-k { font-family: var(--font-mono); font-size: 10px; color: var(--mute-2); letter-spacing: 1.5px; text-transform: uppercase; }
.meta-v { font-family: var(--font-display); font-weight: 700; font-size: 16px; }

.hero__cta { display: flex; flex-wrap: wrap; gap: 12px; }

/* ---------- SECTIONS ---------- */
.section { padding: 80px 0; border-top: 1px solid var(--line); }
.section--challenge { background: linear-gradient(180deg, var(--bg), #070d22); }
.section__eyebrow {
  font-family: var(--font-mono); font-size: 11px; color: var(--teal);
  letter-spacing: 2px; text-transform: uppercase;
  margin: 0 0 14px;
}
.section__title {
  font-family: var(--font-display); font-weight: 900;
  font-size: clamp(2rem, 5vw, 3.4rem);
  line-height: 1.05; letter-spacing: 1px;
  margin: 0 0 18px; text-transform: uppercase;
}
.section__lede {
  color: var(--mute); max-width: 720px; margin: 0 0 36px;
  font-size: 1rem;
}
.section__lede b { color: var(--text); }

/* ---------- PRIZE ---------- */
.prize-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin: 28px 0 28px;
}
.prize-card {
  position: relative;
  padding: 28px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease;
}
.prize-card:hover { transform: translateY(-4px); border-color: var(--teal); box-shadow: 0 12px 30px rgba(0,0,0,0.4); }
.prize-card__rank {
  font-family: var(--font-mono); font-size: 12px; letter-spacing: 2px;
  color: var(--mute);
  position: absolute; top: 18px; right: 22px;
}
.prize-card h3 {
  font-family: var(--font-display); font-weight: 700;
  font-size: 1.3rem; margin: 0 0 10px; text-transform: uppercase;
  letter-spacing: 1px;
}
.prize-card__amount {
  font-family: var(--font-display); font-weight: 900;
  font-size: 2rem; margin: 0; letter-spacing: 1px;
}
.prize-card--gold   { border-color: rgba(255,210,74,0.5); }
.prize-card--gold .prize-card__amount   { color: var(--gold); }
.prize-card--silver { border-color: rgba(199,210,232,0.4); }
.prize-card--silver .prize-card__amount { color: var(--silver); }
.prize-card--bronze { border-color: rgba(224,138,74,0.4); }
.prize-card--bronze .prize-card__amount { color: var(--bronze); }

.fee-row {
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 16px;
  padding: 22px 26px;
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  margin-top: 8px;
}
.fee-row__label {
  margin: 0;
  font-family: var(--font-display); font-weight: 700; letter-spacing: 1.5px;
  text-transform: uppercase; font-size: 1rem;
}
.fee-row__values { display: flex; flex-wrap: wrap; gap: 10px; }
.fee-pill {
  padding: 10px 16px;
  font-family: var(--font-mono); font-size: 13px;
  background: rgba(0,229,199,0.08);
  border: 1px solid var(--line-2);
  border-radius: 999px;
  color: var(--text);
}
.fee-pill b { color: var(--teal); margin-right: 6px; }

/* ---------- HOW IT WORKS ---------- */
.steps {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
  margin-top: 28px;
}
.step {
  padding: 26px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  position: relative;
  transition: border-color .2s ease, transform .2s ease;
}
.step:hover { border-color: var(--teal); transform: translateY(-3px); }
.step__num {
  font-family: var(--font-mono); font-size: 12px; color: var(--teal);
  letter-spacing: 2px;
  display: inline-block; margin-bottom: 10px;
}
.step h3 {
  font-family: var(--font-display); font-weight: 700;
  font-size: 1.4rem; margin: 0 0 10px;
  letter-spacing: 1px; text-transform: uppercase;
}
.step p { color: var(--mute); margin: 0; font-size: .98rem; }

/* ---------- ELIGIBILITY ---------- */
.elig-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
  margin-top: 28px;
}
.elig-card {
  padding: 24px 26px;
  background: var(--panel);
  border-left: 3px solid var(--teal);
  border-radius: 0 var(--radius) var(--radius) 0;
}
.elig-card h3 {
  font-family: var(--font-display); font-weight: 700;
  font-size: 1.2rem; margin: 0 0 8px;
  letter-spacing: 1px; text-transform: uppercase;
}
.elig-card p { color: var(--mute); margin: 0; font-size: .98rem; }
.elig-card b { color: var(--text); }

/* ---------- TIMELINE ---------- */
.timeline {
  list-style: none; padding: 0; margin: 28px 0 0;
  border-left: 2px solid var(--line);
  display: flex; flex-direction: column; gap: 6px;
}
.timeline li {
  position: relative;
  padding: 16px 22px;
  display: flex; gap: 24px; align-items: baseline;
  transition: background .2s;
}
.timeline li::before {
  content: '';
  position: absolute; left: -7px; top: 22px;
  width: 12px; height: 12px; border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--mute);
}
.timeline li:hover { background: rgba(255,255,255,0.02); }
.timeline li:hover::before { border-color: var(--teal); box-shadow: 0 0 12px var(--teal); }
.timeline .is-highlight::before { background: var(--teal); border-color: var(--teal); box-shadow: 0 0 14px var(--teal); }
.timeline .is-highlight .timeline__event { color: var(--teal); }
.timeline__date {
  font-family: var(--font-mono); font-size: 12px;
  color: var(--mute); letter-spacing: 1.5px;
  min-width: 80px;
}
.timeline__event {
  font-family: var(--font-display); font-weight: 600;
  font-size: 1.1rem; letter-spacing: .5px; text-transform: uppercase;
}

/* ---------- REGISTER STEPS ---------- */
.reg-steps {
  list-style: none; padding: 0; margin: 24px 0 36px;
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  counter-reset: regstep;
}
.reg-steps li {
  padding: 18px 20px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-family: var(--font-display); font-weight: 600;
  letter-spacing: .5px;
  display: flex; gap: 12px; align-items: center;
}
.reg-steps li span {
  flex-shrink: 0;
  width: 28px; height: 28px;
  border-radius: 50%;
  background: var(--teal); color: #061021;
  display: inline-flex; align-items: center; justify-content: center;
  font-family: var(--font-mono); font-weight: 700; font-size: 13px;
}
.reg-cta {
  text-align: center;
  padding: 32px 24px;
  background: var(--panel-2);
  border: 1px solid var(--line-2);
  border-radius: var(--radius);
}
.reg-cta__note {
  font-family: var(--font-mono); font-size: 12px;
  color: var(--mute); margin: 14px 0 0;
}
.reg-cta__note b { color: var(--yellow); }

/* ---------- GAME ---------- */
.game {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 22px;
  margin-top: 28px;
  align-items: start;
}
.hud {
  padding: 20px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  display: flex; flex-direction: column; gap: 12px;
  position: sticky; top: 90px;
}
.hud__row {
  display: flex; align-items: center; justify-content: space-between;
  padding: 8px 12px;
  border-radius: 6px;
  background: rgba(10,17,40,0.6);
  border: 1px solid var(--line);
}
.hud__k { font-family: var(--font-mono); font-size: 11px; color: var(--mute); letter-spacing: 1.5px; }
.hud__v { font-family: var(--font-display); font-weight: 700; font-size: 18px; }
.hud__v--accent { color: var(--yellow); }

.progress {
  position: relative;
  height: 22px;
  border-radius: 999px;
  background: rgba(10,17,40,0.8);
  border: 1px solid var(--line-2);
  overflow: hidden;
}
.progress__bar {
  height: 100%;
  background: linear-gradient(90deg, var(--teal), var(--cyan), var(--yellow));
  transition: width .3s ease;
  box-shadow: 0 0 12px rgba(0,229,199,0.5);
}
.progress__text {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-mono); font-size: 11px;
  text-shadow: 0 1px 4px rgba(0,0,0,0.6);
}
.hud__controls { display: flex; gap: 8px; }
.hud__controls .btn { flex: 1; }
.hud__legend {
  font-family: var(--font-mono); font-size: 11px;
  color: var(--mute);
  border-top: 1px dashed var(--line);
  padding-top: 12px; line-height: 1.8;
}
.hud__legend p { margin: 0; }

.stage {
  position: relative;
  width: 100%; max-width: 600px;
  aspect-ratio: 1 / 1;
  margin: 0 auto;
  background: linear-gradient(180deg, #050B22, #08122E);
  border: 1px solid var(--line-2);
  border-radius: var(--radius);
  padding: 8px;
}
#snakeCanvas {
  width: 100%; height: 100%;
  display: block;
  border-radius: 8px;
  touch-action: none;
}
.stage__overlay {
  position: absolute; inset: 8px;
  display: flex; align-items: center; justify-content: center;
  background: rgba(6,10,28,0.85);
  backdrop-filter: blur(6px);
  border-radius: 8px;
  transition: opacity .25s;
}
.stage__overlay[hidden] { display: none; }
.stage__panel { text-align: center; padding: 20px; max-width: 360px; }
.stage__panel h3 {
  font-family: var(--font-display); font-weight: 800;
  font-size: clamp(22px, 4vw, 32px);
  letter-spacing: 3px; margin: 0 0 10px;
  color: var(--teal);
}
.stage__panel p {
  color: var(--mute); font-family: var(--font-mono);
  font-size: 13px; margin: 0 0 18px;
}

/* ---------- UNLOCK ---------- */
.section--unlock {
  background:
    radial-gradient(circle at 50% 0%, rgba(0,229,199,0.15), transparent 60%),
    linear-gradient(180deg, var(--bg), #060B22);
}
.unlock__container {
  display: flex; align-items: center; justify-content: center;
  min-height: 60vh;
}
.unlock__panel {
  text-align: center;
  max-width: 640px;
  padding: 40px 32px;
  background: var(--panel);
  border: 1px solid var(--line-2);
  border-radius: var(--radius);
  box-shadow: 0 20px 60px rgba(0,0,0,0.5), 0 0 60px rgba(0,229,199,0.15);
  animation: popIn .5s ease;
}
@keyframes popIn { from{opacity:0;transform:translateY(20px) scale(.98)} to{opacity:1;transform:translateY(0) scale(1)} }

.unlock__check {
  color: var(--teal);
  margin: 0 auto 18px;
  width: 64px; height: 64px;
  filter: drop-shadow(0 0 10px rgba(0,229,199,0.7));
}
.check-circle {
  stroke-dasharray: 176; stroke-dashoffset: 176;
  animation: drawCircle .9s ease forwards;
}
.check-path {
  stroke-dasharray: 50; stroke-dashoffset: 50;
  animation: drawCheck .5s ease .9s forwards;
}
@keyframes drawCircle { to { stroke-dashoffset: 0; } }
@keyframes drawCheck  { to { stroke-dashoffset: 0; } }

.terminal {
  text-align: left;
  font-family: var(--font-mono);
  font-size: 12px;
  background: rgba(5,10,25,0.9);
  border: 1px solid var(--line-2);
  border-radius: 8px;
  padding: 14px 16px;
  color: var(--mute);
  line-height: 1.9;
  margin: 22px 0;
}
.terminal p { margin: 0; }
.terminal .ok { color: var(--teal); font-weight: 700; }
.unlock__note { color: var(--mute); font-family: var(--font-mono); font-size: 11px; margin: 16px 0 0; }

/* ---------- FOOTER ---------- */
.footer {
  padding: 40px 0 30px;
  border-top: 1px solid var(--line);
  background: #060B22;
}
.footer__inner {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 24px;
  align-items: center;
}
.footer__brand { display: flex; gap: 12px; align-items: center; }
.footer__brand img { width: 36px; height: 36px; border-radius: 8px; }
.footer__brand strong { font-family: var(--font-display); font-weight: 700; letter-spacing: 1px; display: block; }
.footer__brand span { font-family: var(--font-mono); font-size: 11px; color: var(--mute); }
.footer__links {
  display: flex; gap: 22px; justify-content: center;
  font-family: var(--font-display); font-weight: 600;
  letter-spacing: 1px; font-size: 13px; text-transform: uppercase;
}
.footer__links a { color: var(--mute); }
.footer__links a:hover { color: var(--teal); }
.footer__copy {
  margin: 0;
  text-align: right;
  font-family: var(--font-mono); font-size: 11px; color: var(--mute);
}

/* ---------- RESPONSIVE ---------- */
@media (max-width: 920px) {
  .nav__links { display: none; }
  .hero__meta { grid-template-columns: repeat(2, 1fr); }
  .prize-grid { grid-template-columns: 1fr; }
  .steps, .elig-grid { grid-template-columns: 1fr; }
  .reg-steps { grid-template-columns: repeat(2, 1fr); }
  .game { grid-template-columns: 1fr; }
  .hud { position: static; order: 2; }
  .footer__inner { grid-template-columns: 1fr; text-align: center; }
  .footer__brand { justify-content: center; }
  .footer__copy { text-align: center; }
}
@media (max-width: 560px) {
  .nav { padding: 12px 16px; }
  .nav__cta { display: none; }
  .container { padding: 0 18px; }
  .hero { padding: 50px 0 70px; }
  .section { padding: 60px 0; }
  .reg-steps { grid-template-columns: 1fr; }
  .timeline li { flex-direction: column; gap: 4px; padding: 12px 18px; }
  .fee-row { flex-direction: column; align-items: flex-start; }
  .footer__links { flex-wrap: wrap; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .001ms !important;
    transition-duration: .001ms !important;
  }
}