/* =========================================================
   ROBOFORGE 2K26 — tokens
   ========================================================= */
:root {
  --ink: #10131a;
  --ink-soft: #191d26;
  --paper: #f2ece0;
  --paper-dim: #cdc4ab;
  --ember: #ff4e24;
  --ember-dim: #c93e1b;
  --brass: #c9a227;
  --steel: #4b5566;
  --steel-line: rgba(75, 85, 102, 0.28);
  --paper-line: rgba(242, 236, 224, 0.16);

  --font-display: "Fraunces", Georgia, serif;
  --font-body: "Instrument Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  --wrap: 1180px;
  --gap: clamp(1.25rem, 3vw, 2.5rem);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 {
  font-family: var(--font-display);
  margin: 0;
  color: inherit;
  font-weight: 600;
  letter-spacing: -0.01em;
}

p { margin: 0; }

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

:focus-visible {
  outline: 2px solid var(--ember);
  outline-offset: 3px;
}

img { max-width: 100%; display: block; }

.section-title {
  font-size: clamp(1.9rem, 3.4vw, 2.7rem);
  line-height: 1.1;
}

.section-sub {
  font-size: 1.05rem;
  color: var(--steel);
  max-width: 46ch;
  margin-top: 0.85rem;
}

.section-head {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 var(--gap);
}

/* =========================================================
   Buttons
   ========================================================= */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 1.6rem;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.98rem;
  border-radius: 2px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}
.btn:hover { transform: translateY(-1px); }

.btn-ember {
  background: var(--ember);
  color: var(--paper);
}
.btn-ember:hover { background: var(--ember-dim); }

.btn-ghost {
  background: transparent;
  border-color: var(--steel-line);
  color: var(--ink);
}
.btn-ghost:hover { border-color: var(--ink); }

.btn-paper {
  background: var(--paper);
  color: var(--ink);
}
.btn-paper:hover { background: #ffffff; }

/* =========================================================
   Nav
   ========================================================= */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(16, 19, 26, 0);
  border-bottom: 1px solid transparent;
  transition: background 0.25s ease, border-color 0.25s ease;
}
.nav.is-scrolled {
  background: rgba(16, 19, 26, 0.94);
  border-color: var(--paper-line);
  backdrop-filter: blur(6px);
}

.nav-inner {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 1.1rem var(--gap);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.nav-mark {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--paper);
}
.nav-mark span { color: var(--ember); }

.nav-links {
  display: flex;
  gap: 1.9rem;
  font-size: 0.95rem;
  color: var(--paper-dim);
}
.nav-links a:hover { color: var(--paper); }

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.nav-cta { padding: 0.6rem 1.2rem; font-size: 0.9rem; }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 34px;
  height: 34px;
  background: none;
  border: none;
  cursor: pointer;
}
.nav-toggle span {
  height: 2px;
  background: var(--paper);
  border-radius: 1px;
}

/* =========================================================
   Hero
   ========================================================= */
.hero {
  position: relative;
  background: var(--ink);
  color: var(--paper);
  padding: clamp(7.5rem, 16vw, 11rem) var(--gap) 5rem;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(60% 55% at 82% 8%, rgba(255, 78, 36, 0.22), transparent 60%),
    radial-gradient(40% 40% at 100% 100%, rgba(201, 162, 39, 0.14), transparent 60%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  max-width: var(--wrap);
  margin: 0 auto;
}

.hero-kicker {
  font-size: 0.95rem;
  color: var(--paper-dim);
  margin-bottom: 1.4rem;
}
.hero-kicker-link {
  text-decoration: underline;
  text-underline-offset: 2px;
  color: var(--ember);
}
.hero-kicker-link:hover { color: var(--paper); }

.hero-prize {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  padding: 0.6rem 1.3rem;
  margin-bottom: 1.8rem;
  border-radius: 999px;
  background: linear-gradient(90deg, rgba(201, 162, 39, 0.16), rgba(255, 78, 36, 0.14));
  border: 1px solid rgba(201, 162, 39, 0.45);
  overflow: hidden;
  animation: prize-pulse 2.6s ease-in-out infinite;
}
.hero-prize-glow {
  position: absolute;
  top: 0;
  left: -60%;
  width: 40%;
  height: 100%;
  background: linear-gradient(120deg, transparent, rgba(255, 255, 255, 0.35), transparent);
  transform: skewX(-20deg);
  animation: prize-shine 2.6s ease-in-out infinite;
}
.hero-prize-amount {
  position: relative;
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--brass);
  letter-spacing: 0.01em;
}
.hero-prize-label {
  position: relative;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--paper-dim);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

@keyframes prize-pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(201, 162, 39, 0.35); }
  50% { box-shadow: 0 0 0 9px rgba(201, 162, 39, 0); }
}
@keyframes prize-shine {
  0% { left: -60%; }
  55%, 100% { left: 130%; }
}

.hero-title {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.1em 0.5rem;
  line-height: 0.92;
}
.hero-title-main {
  font-size: clamp(4rem, 13vw, 9.5rem);
  font-weight: 600;
  font-optical-sizing: auto;
}
.hero-title-year {
  font-size: clamp(2.2rem, 6vw, 4.2rem);
  font-weight: 400;
  font-style: italic;
  color: var(--ember);
}

.hero-sub {
  max-width: 52ch;
  font-size: clamp(1.05rem, 1.6vw, 1.2rem);
  color: var(--paper-dim);
  margin-top: 1.8rem;
}

.hero-cta-row {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-top: 2.4rem;
}
.hero .btn-ghost { border-color: var(--paper-line); color: var(--paper); }
.hero .btn-ghost:hover { border-color: var(--paper); }

.hero-meta {
  margin: 3.6rem 0 0;
  padding-top: 2rem;
  border-top: 1px solid var(--paper-line);
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 1.5rem;
}
.hero-meta-item dt {
  font-size: 0.82rem;
  color: var(--paper-dim);
  margin-bottom: 0.35rem;
}
.hero-meta-item dd {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.1rem;
}

.hero-scroll {
  position: absolute;
  right: var(--gap);
  bottom: 1.8rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--paper-dim);
  font-size: 0.82rem;
}
.hero-scroll span {
  width: 1px;
  height: 34px;
  background: var(--paper-dim);
}

/* =========================================================
   Countdown
   ========================================================= */
.countdown {
  background: var(--ink-soft);
  color: var(--paper);
  padding: 2.6rem var(--gap);
  text-align: center;
  border-bottom: 1px solid var(--paper-line);
}
.countdown-label {
  font-size: 0.9rem;
  color: var(--paper-dim);
  margin-bottom: 1.1rem;
}
.countdown-clock {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: clamp(0.5rem, 2vw, 1.4rem);
}
.clock-unit { display: flex; flex-direction: column; align-items: center; min-width: 3.6ch; }
.clock-num {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 6vw, 3.6rem);
  font-weight: 600;
  color: var(--ember);
  line-height: 1;
}
.clock-word {
  font-size: 0.78rem;
  color: var(--paper-dim);
  margin-top: 0.5rem;
}
.clock-sep {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 4vw, 2.6rem);
  color: var(--paper-line);
  transform: translateY(-0.4rem);
}

/* =========================================================
   About
   ========================================================= */
.about { padding: clamp(4.5rem, 8vw, 7rem) var(--gap); }
.about-inner { max-width: var(--wrap); margin: 0 auto; }

.about-lead {
  max-width: 62ch;
  font-size: clamp(1.1rem, 1.8vw, 1.35rem);
  color: var(--steel);
  margin-top: 1.4rem;
  line-height: 1.55;
}

.about-stats {
  margin-top: 3rem;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: 1px solid var(--steel-line);
}
.stat {
  padding: 1.6rem 1.2rem 0;
  border-left: 1px solid var(--steel-line);
}
.stat:first-child { border-left: none; padding-left: 0; }
.stat-num {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  color: var(--ember);
}
.stat-word {
  display: block;
  font-size: 0.88rem;
  color: var(--steel);
  margin-top: 0.4rem;
}

/* =========================================================
   Tracks
   ========================================================= */
.tracks {
  background: var(--ink);
  color: var(--paper);
  padding: clamp(4.5rem, 8vw, 7rem) 0;
}
.tracks .section-title,
.timeline .section-title,
.prizes .section-title { color: inherit; }
.tracks .section-sub { color: var(--paper-dim); }

.track-grid {
  max-width: var(--wrap);
  margin: 3rem auto 0;
  padding: 0 var(--gap);
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--paper-line);
  border: 1px solid var(--paper-line);
}
.track-grid--single {
  grid-template-columns: minmax(0, 1fr);
  max-width: 640px;
}

.track-card {
  background: var(--ink);
  padding: 2.1rem 1.8rem;
  border-top: 3px solid var(--accent, var(--ember));
  transition: background 0.2s ease;
}
.track-card:hover { background: var(--ink-soft); }

.track-index {
  font-size: 0.78rem;
  color: var(--paper-dim);
  margin-bottom: 0.9rem;
}

.track-card h3 {
  font-size: 1.3rem;
  margin-bottom: 0.6rem;
}

.track-card p {
  color: var(--paper-dim);
  font-size: 0.95rem;
  line-height: 1.55;
}

/* =========================================================
   Rules
   ========================================================= */
.rules {
  padding: clamp(4.5rem, 8vw, 7rem) var(--gap);
}

.rules-list {
  max-width: var(--wrap);
  margin: 3rem auto 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--steel-line);
  border: 1px solid var(--steel-line);
}

.rule-item {
  background: var(--paper);
  padding: 2.1rem 1.8rem;
  border-top: 3px solid var(--accent, var(--ember));
}

.rule-item h3 {
  font-size: 1.2rem;
  margin-bottom: 0.6rem;
}

.rule-item p {
  color: var(--steel);
  font-size: 0.95rem;
  line-height: 1.55;
}

/* =========================================================
   Timeline
   ========================================================= */
.timeline {
  padding: clamp(4.5rem, 8vw, 7rem) var(--gap);
}

.timeline-list {
  list-style: none;
  margin: 3rem auto 0;
  padding: 0;
  max-width: var(--wrap);
  border-top: 1px solid var(--steel-line);
}

.timeline-item {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 1.5rem;
  padding: 1.6rem 0;
  border-bottom: 1px solid var(--steel-line);
}

.timeline-time {
  font-family: var(--font-display);
  font-style: italic;
  color: var(--ember-dim);
  font-size: 1rem;
}

.timeline-item h3 {
  font-size: 1.2rem;
  margin-bottom: 0.35rem;
}
.timeline-item p {
  color: var(--steel);
  font-size: 0.95rem;
  max-width: 52ch;
}

/* =========================================================
   Prizes
   ========================================================= */
.prizes {
  background: var(--ink);
  color: var(--paper);
  padding: clamp(4.5rem, 8vw, 7rem) var(--gap);
}
.prizes-inner { max-width: var(--wrap); margin: 0 auto; text-align: center; }
.prizes-note {
  margin-top: 1rem;
  color: var(--paper-dim);
  font-size: 1.05rem;
}

.prize-tiers {
  margin: 3rem auto 0;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  max-width: 900px;
  border-top: 1px solid var(--paper-line);
  border-left: 1px solid var(--paper-line);
}
.prize-tiers--two {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  max-width: 500px;
}
.prize-tier {
  padding: 1.8rem 1rem;
  border-right: 1px solid var(--paper-line);
  border-bottom: 1px solid var(--paper-line);
}
.prize-rank {
  display: block;
  font-size: 0.85rem;
  color: var(--paper-dim);
  margin-bottom: 0.6rem;
}
.prize-amount {
  display: block;
  font-family: var(--font-display);
  font-size: 1.6rem;
  color: var(--brass);
}

/* =========================================================
   Register CTA
   ========================================================= */
.register {
  background: var(--ember);
  color: var(--paper);
  padding: clamp(4rem, 8vw, 6rem) var(--gap);
  text-align: center;
}
.register-inner { max-width: 640px; margin: 0 auto; }
.register h2 {
  font-size: clamp(2rem, 4vw, 2.8rem);
  color: var(--ink);
}
.register p {
  margin-top: 1rem;
  color: rgba(16, 19, 26, 0.75);
  font-size: 1.05rem;
}
.register .btn-paper { margin-top: 2rem; }

/* =========================================================
   Footer
   ========================================================= */
.footer {
  background: var(--ink);
  color: var(--paper-dim);
  padding: 4rem var(--gap) 1.5rem;
}
.footer-top {
  max-width: var(--wrap);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 2.5rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid var(--paper-line);
}

.footer-mark {
  font-family: var(--font-display);
  font-size: 1.4rem;
  color: var(--paper);
}
.footer-mark span { color: var(--ember); }
.footer-brand p { margin-top: 0.9rem; font-size: 0.92rem; line-height: 1.6; }

.back-link {
  display: inline-block;
  margin-top: 1rem;
  font-size: 0.85rem;
  color: var(--ember);
  text-decoration: underline;
  text-underline-offset: 2px;
}
.back-link:hover { color: var(--paper); }

.footer-col h4 {
  font-family: var(--font-body);
  font-size: 0.85rem;
  color: var(--paper);
  margin-bottom: 1rem;
  font-weight: 600;
}
.footer-col a, .footer-col p {
  display: block;
  font-size: 0.92rem;
  margin-bottom: 0.6rem;
  line-height: 1.5;
}
.footer-col a:hover { color: var(--paper); }

.footer-bottom {
  max-width: var(--wrap);
  margin: 0 auto;
  padding-top: 1.5rem;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.82rem;
}
.footer-social { display: flex; gap: 1.3rem; }
.footer-social a:hover { color: var(--paper); }

/* =========================================================
   Responsive
   ========================================================= */
@media (max-width: 860px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: var(--ink);
    border-top: 1px solid var(--paper-line);
    border-bottom: 1px solid var(--paper-line);
  }
  .nav-links.is-open { display: flex; }
  .nav-links a {
    padding: 1rem var(--gap);
    border-bottom: 1px solid var(--paper-line);
  }
  .nav-toggle { display: flex; }

  .hero-meta { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .about-stats { grid-template-columns: 1fr; }
  .stat { border-left: none; padding-left: 0; border-top: 1px solid var(--steel-line); padding-top: 1.6rem; margin-top: 1.6rem; }
  .stat:first-child { border-top: none; padding-top: 0; margin-top: 0; }

  .track-grid { grid-template-columns: 1fr; }
  .rules-list { grid-template-columns: 1fr; }
  .timeline-item { grid-template-columns: 1fr; gap: 0.4rem; }
  .prize-tiers,
  .prize-tiers--two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-top { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 520px) {
  .hero-meta { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr; }
  .prize-tiers { grid-template-columns: 1fr; }
  .prize-tiers--two { grid-template-columns: 1fr; }
}