/* ===== CFS IgniteX 2026 – Dark theme + neon ===== */
:root {
  /* Dark base */
  --bg-black: #0a0a0f;
  --bg-dark: #0f0f18;
  --bg-mid: #16161f;
  --bg-card: #1a1a26;
  /* Neon accents */
  --neon-green: #00ff88;
  --neon-cyan: #00e5ff;
  --neon-mint: #7dffc3;
  --accent: #00ff88;
  --accent-dim: rgba(0, 255, 136, 0.7);
  --cyan-dim: rgba(0, 229, 255, 0.6);
  /* Text */
  --text-on-dark: #e8e8f0;
  --text-muted: rgba(232, 232, 240, 0.75);
  --text-faint: rgba(232, 232, 240, 0.5);
  /* Glass (dark) */
  --glass-bg: rgba(22, 22, 31, 0.6);
  --glass-border: rgba(0, 255, 136, 0.15);
  --glass-border-strong: rgba(0, 255, 136, 0.25);
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  /* Neon glow */
  --glow-green: 0 0 20px rgba(0, 255, 136, 0.25);
  --glow-green-strong: 0 0 30px rgba(0, 255, 136, 0.35);
  --glow-text: 0 0 12px rgba(0, 255, 136, 0.4);
  /* Typography */
  --font: 'Plus Jakarta Sans', system-ui, sans-serif;
  --scale: 1.25;
  --text-base: 1rem;
  --text-sm: 0.875rem;
  --heading-1: clamp(2rem, 5vw, 3rem);
  --heading-2: clamp(1.5rem, 3vw, 2rem);
  --heading-3: clamp(1.125rem, 2vw, 1.375rem);
  /* Spacing & layout */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 4rem;
  --space-3xl: 6rem;
  --max-width: 1200px;
  --radius: 14px;
  --radius-lg: 18px;
  /* Shadows */
  --shadow-soft: 0 4px 12px rgba(0, 0, 0, 0.3);
  --shadow-card: 0 10px 40px rgba(0, 0, 0, 0.35);
  --shadow-cta: 0 0 24px rgba(0, 255, 136, 0.4);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: var(--text-base);
  font-weight: 400;
  line-height: 1.6;
  color: var(--text-on-dark);
  background: linear-gradient(165deg, var(--bg-black) 0%, var(--bg-dark) 30%, #0d1220 60%, var(--bg-mid) 100%);
  background-attachment: fixed;
  min-height: 100vh;
}

/* ===== Header ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: var(--space-sm) var(--space-md);
  background: rgba(10, 10, 15, 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: var(--glow-green);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--text-on-dark);
  text-decoration: none;
  text-shadow: var(--glow-text);
}

.nav-menu {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: var(--space-md);
}

.nav-menu a {
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s;
}

.nav-menu a:hover,
.nav-menu a:focus-visible {
  color: var(--text-on-dark);
  text-shadow: 0 0 8px rgba(0, 255, 136, 0.3);
}

.nav-cta {
  color: var(--neon-green) !important;
  text-shadow: 0 0 10px rgba(0, 255, 136, 0.4);
}

.nav-toggle {
  display: none;
  width: 2rem;
  height: 2rem;
  padding: 0;
  border: none;
  background: transparent;
  cursor: pointer;
  color: var(--text-on-dark);
  font-size: 1.5rem;
  line-height: 1;
}

/* ===== Glass utility ===== */
.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--glass-shadow), var(--glow-green);
}

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-3xl) var(--space-md);
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 50% 20%, rgba(0, 255, 136, 0.06) 0%, transparent 50%),
    radial-gradient(ellipse 60% 40% at 80% 80%, rgba(0, 229, 255, 0.04) 0%, transparent 50%),
    linear-gradient(145deg, var(--bg-black) 0%, var(--bg-dark) 50%, #0a1420 100%);
  opacity: 1;
}

.hero-content {
  position: relative;
  max-width: 640px;
  width: 100%;
  padding: var(--space-2xl);
  text-align: center;
}

.hero h1 {
  margin: 0 0 var(--space-xs);
  font-size: var(--heading-1);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-on-dark);
  text-shadow: 0 0 24px rgba(0, 255, 136, 0.35);
}

.hero-subtitle {
  margin: 0 0 var(--space-sm);
  font-size: 1.25rem;
  color: var(--text-muted);
}

.hero-theme {
  margin: 0 0 var(--space-lg);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--neon-green);
  text-shadow: var(--glow-text);
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
  font-size: var(--text-sm);
  color: var(--text-muted);
}

.hero-prize {
  margin-bottom: var(--space-xl);
  padding: var(--space-md);
  border-radius: var(--radius);
  background: rgba(0, 0, 0, 0.35);
  border: 1px solid var(--glass-border);
  box-shadow: 0 0 16px rgba(0, 255, 136, 0.1);
}

.prize-pool {
  margin: 0 0 var(--space-xs);
  font-size: 1.125rem;
}

.hero-prize p:last-child {
  margin: 0;
  font-size: var(--text-sm);
  color: var(--text-muted);
}

/* ===== Buttons ===== */
.btn {
  display: inline-block;
  padding: var(--space-sm) var(--space-lg);
  font-family: var(--font);
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
}

.btn-primary {
  background: linear-gradient(135deg, var(--neon-green), var(--neon-mint));
  color: var(--bg-black);
  font-weight: 700;
  box-shadow: var(--shadow-cta);
  border: 1px solid rgba(0, 255, 136, 0.4);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  transform: translateY(-2px);
  box-shadow: 0 0 32px rgba(0, 255, 136, 0.5), 0 0 60px rgba(0, 255, 136, 0.2);
}

.btn-large {
  padding: var(--space-md) var(--space-xl);
  font-size: 1.125rem;
}

/* ===== Sections common ===== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

section {
  padding: var(--space-3xl) 0;
}

section h2 {
  margin: 0 0 var(--space-xl);
  font-size: var(--heading-2);
  font-weight: 700;
  text-align: center;
  color: var(--text-on-dark);
  text-shadow: 0 0 16px rgba(0, 255, 136, 0.2);
}

/* ===== About ===== */
.about-content {
  padding: var(--space-xl);
}

.about-content p {
  margin: 0;
  max-width: 72ch;
  margin-left: auto;
  margin-right: auto;
  color: var(--text-muted);
}

/* ===== Tracks ===== */
.tracks-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}

.track-card {
  padding: var(--space-lg);
  transition: transform 0.2s, box-shadow 0.2s;
}

.track-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 14px 48px rgba(0, 0, 0, 0.4), var(--glow-green-strong);
  border-color: var(--glass-border-strong);
}

.track-card h3 {
  margin: 0 0 var(--space-sm);
  font-size: var(--heading-3);
  font-weight: 700;
  color: var(--text-on-dark);
}

.track-title {
  margin: 0 0 var(--space-md);
  font-weight: 600;
  color: var(--neon-green);
  text-shadow: 0 0 10px rgba(0, 255, 136, 0.3);
}

.track-card p {
  margin: 0 0 var(--space-sm);
  font-size: var(--text-sm);
  color: var(--text-muted);
}

.track-card .coordinators {
  margin-top: var(--space-md);
  margin-bottom: 0;
  padding-top: var(--space-sm);
  border-top: 1px solid var(--glass-border);
}

.track-card .coordinators a {
  color: var(--neon-green);
  text-decoration: none;
  text-shadow: 0 0 8px rgba(0, 255, 136, 0.25);
}

.track-card .coordinators a:hover,
.track-card .coordinators a:focus-visible {
  text-decoration: underline;
}

.track-card .rules-link {
  display: inline-block;
  margin-top: var(--space-md);
  padding: var(--space-xs) var(--space-sm);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--neon-green);
  text-decoration: none;
  border: 1px solid var(--glass-border-strong);
  border-radius: var(--radius);
  text-shadow: 0 0 8px rgba(0, 255, 136, 0.25);
  transition: box-shadow 0.2s;
}

.track-card .rules-link:hover,
.track-card .rules-link:focus-visible {
  box-shadow: var(--glow-green);
}

/* ===== Participate ===== */
.participate-content {
  padding: var(--space-xl);
  max-width: 720px;
  margin: 0 auto;
}

.participate-content ul {
  margin: 0;
  padding-left: 1.5rem;
  color: var(--text-muted);
}

.participate-content li {
  margin-bottom: var(--space-sm);
}

/* ===== Coordinators ===== */
.coordinators-content {
  padding: var(--space-xl);
  text-align: center;
  max-width: 480px;
  margin: 0 auto;
}

.coordinators-content p {
  margin: 0 0 var(--space-sm);
  color: var(--text-muted);
}

.coordinators-content p:last-child {
  margin-bottom: 0;
}

/* ===== Register ===== */
.register-content {
  padding: var(--space-xl);
  text-align: center;
}

.register-content p {
  margin: 0 0 var(--space-lg);
  color: var(--text-muted);
}

/* ===== Footer ===== */
.site-footer {
  padding: var(--space-xl) var(--space-md);
  text-align: center;
  border-top: 1px solid var(--glass-border);
  color: var(--text-muted);
  font-size: var(--text-sm);
}

.site-footer .container {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  align-items: center;
}

.back-top {
  color: var(--neon-green);
  text-decoration: none;
  text-shadow: 0 0 8px rgba(0, 255, 136, 0.3);
}

.back-top:hover,
.back-top:focus-visible {
  text-decoration: underline;
}

.nav-current {
  color: var(--text-on-dark);
  font-weight: 600;
}

/* ===== Rules page ===== */
.rules-main {
  padding: calc(var(--space-3xl) + 3rem) var(--space-md) var(--space-3xl);
}

.rules-article {
  max-width: 800px;
  margin: 0 auto;
  padding: var(--space-2xl);
}

.rules-article h1 {
  margin: 0 0 var(--space-sm);
  font-size: var(--heading-1);
  font-weight: 700;
  color: var(--text-on-dark);
  text-shadow: 0 0 16px rgba(0, 255, 136, 0.2);
}

.rules-tagline {
  margin: 0 0 var(--space-lg);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--neon-green);
  text-shadow: 0 0 10px rgba(0, 255, 136, 0.3);
}

.rules-article > h2 {
  margin: 0 0 var(--space-xl);
  font-size: var(--heading-2);
  font-weight: 700;
  color: var(--neon-green);
  text-shadow: var(--glow-text);
}

.rules-section {
  margin-bottom: var(--space-xl);
}

.rules-section h3 {
  margin: 0 0 var(--space-sm);
  font-size: var(--heading-3);
  font-weight: 700;
  color: var(--text-on-dark);
}

.rules-section p,
.rules-section ul {
  margin: 0 0 var(--space-sm);
  color: var(--text-muted);
}

.rules-section ul {
  padding-left: 1.5rem;
}

.rules-section li {
  margin-bottom: var(--space-xs);
}

.rules-table {
  width: 100%;
  max-width: 400px;
  margin: var(--space-md) 0;
  border-collapse: collapse;
  font-size: var(--text-sm);
}

.rules-table th,
.rules-table td {
  padding: var(--space-sm) var(--space-md);
  text-align: left;
  border: 1px solid var(--glass-border);
}

.rules-table th {
  background: rgba(0, 255, 136, 0.1);
  color: var(--neon-green);
  font-weight: 600;
}

.rules-table tbody tr:nth-child(even) {
  background: rgba(255, 255, 255, 0.03);
}

.rules-table td {
  color: var(--text-muted);
}

.rules-coordinator {
  margin-top: var(--space-xl);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--glass-border);
  color: var(--text-muted);
}

.rules-coordinator a {
  color: var(--neon-green);
  text-decoration: none;
  text-shadow: 0 0 8px rgba(0, 255, 136, 0.25);
}

.rules-coordinator a:hover,
.rules-coordinator a:focus-visible {
  text-decoration: underline;
}

/* ===== Rules index page ===== */
.rules-intro {
  max-width: 640px;
  margin: 0 auto var(--space-2xl);
  padding: var(--space-xl);
  text-align: center;
}

.rules-intro h1 {
  margin: 0 0 var(--space-sm);
  font-size: var(--heading-1);
  font-weight: 700;
  color: var(--text-on-dark);
  text-shadow: 0 0 16px rgba(0, 255, 136, 0.2);
}

.rules-intro p {
  margin: 0;
  color: var(--text-muted);
}

.rules-index-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
  max-width: 900px;
  margin: 0 auto;
}

@media (min-width: 768px) {
  .rules-index-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .rules-index-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.rules-index-card {
  display: block;
  padding: var(--space-lg);
  text-decoration: none;
  color: inherit;
  transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
}

.rules-index-card:hover,
.rules-index-card:focus-visible {
  transform: translateY(-4px);
  box-shadow: var(--glow-green-strong);
  border-color: var(--glass-border-strong);
}

.rules-index-card h3 {
  margin: 0 0 var(--space-sm);
  font-size: var(--heading-3);
  font-weight: 700;
  color: var(--neon-green);
  text-shadow: 0 0 10px rgba(0, 255, 136, 0.3);
}

.rules-index-title {
  margin: 0 0 var(--space-sm);
  font-weight: 600;
  color: var(--text-on-dark);
  font-size: 1rem;
}

.rules-index-card p:last-of-type {
  margin: 0 0 var(--space-md);
  font-size: var(--text-sm);
  color: var(--text-muted);
  line-height: 1.5;
}

.rules-index-link {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--neon-green);
  text-shadow: 0 0 8px rgba(0, 255, 136, 0.25);
}

.rules-article .rules-section a {
  color: var(--neon-green);
  text-decoration: none;
  text-shadow: 0 0 8px rgba(0, 255, 136, 0.25);
}

.rules-article .rules-section a:hover,
.rules-article .rules-section a:focus-visible {
  text-decoration: underline;
}

/* ===== Responsive ===== */
@media (min-width: 480px) {
  .hero-meta {
    font-size: 1rem;
  }
}

@media (min-width: 768px) {
  .tracks-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .nav-toggle {
    display: none;
  }
}

@media (min-width: 1024px) {
  .tracks-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-xl);
  }

  /* 5th card can span or stay in grid */
  .track-card:nth-child(5) {
    grid-column: span 1;
  }
}

@media (max-width: 767px) {
  .nav-toggle {
    display: block;
  }

  .nav-menu {
    position: fixed;
    top: 3.5rem;
    left: 0;
    right: 0;
    flex-direction: column;
    padding: var(--space-lg);
    background: rgba(10, 10, 15, 0.98);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--glass-border);
    gap: var(--space-sm);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: transform 0.25s, opacity 0.25s, visibility 0.25s;
  }

  .nav-menu.is-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav-toggle[aria-expanded="true"]::before {
    content: "✕";
  }

  .nav-toggle[aria-expanded="false"]::before {
    content: "☰";
  }
}

/* Focus styles for accessibility */
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--neon-green);
  outline-offset: 2px;
  box-shadow: 0 0 12px rgba(0, 255, 136, 0.4);
}