/* ============================================
   Oddity Arena — FBI Classified Dossier Theme
   Adapted from 不现实商店 Design System
   ============================================ */

/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Special+Elite&family=Courier+Prime:wght@400;700&family=Noto+Serif+SC:wght@400;700;900&family=Noto+Sans+SC:wght@400;700&family=Ma+Shan+Zheng&family=Black+Ops+One&display=swap');

/* Theme Variables */
:root {
  --paper: #F5F0E1;
  --paper-dark: #E8E3D4;
  --paper-manila: #D4C8A8;
  --ink: #1A1A1A;
  --ink-light: #4A4A4A;
  --ink-gray: #666666;
  --brand-yellow: #FFE500;
  --highlight: rgba(255, 229, 0, 0.4);
  --stamp-red: #C41E3A;
  --redacted: #1A1A1A;

  /* Semantic aliases for battle components */
  --bg: var(--paper);
  --surface: var(--paper-dark);
  --text: var(--ink);
  --text-dim: var(--ink-gray);
  --accent: var(--stamp-red);
  --accent-yellow: var(--brand-yellow);
  --border: var(--ink);
}

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

body {
  font-family: 'Noto Serif SC', 'Noto Sans SC', serif;
  background: var(--paper);
  color: var(--ink);
  min-height: 100vh;
  overflow-x: hidden;
}

/* Paper texture */
body::before {
  content: '';
  position: fixed;
  top: 0; left: 0; width: 100%; height: 100%;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='5' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
  opacity: 0.04;
  pointer-events: none;
  z-index: 1000;
}

/* Vignette */
body::after {
  content: '';
  position: fixed;
  top: 0; left: 0; width: 100%; height: 100%;
  background: radial-gradient(ellipse at center, transparent 50%, rgba(139, 90, 43, 0.08) 100%);
  pointer-events: none;
  z-index: 999;
}

::selection {
  background: var(--brand-yellow);
  color: var(--ink);
}

a { color: var(--ink); }
a:hover { color: var(--stamp-red); }

/* ============================================
   Typography
   ============================================ */
.font-typewriter { font-family: 'Special Elite', 'Courier Prime', monospace; }
.font-mono { font-family: 'Courier Prime', 'Courier New', monospace; }
.font-stamp { font-family: 'Black Ops One', 'Special Elite', monospace; text-transform: uppercase; }

/* ============================================
   Layout
   ============================================ */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ============================================
   Navigation
   ============================================ */
nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 0;
  border-bottom: 2px solid var(--ink);
  margin-bottom: 0;
}

.nav-brand {
  font-family: 'Special Elite', monospace;
  font-size: 1.1rem;
  letter-spacing: 0.15em;
  text-decoration: none;
  color: var(--ink);
  font-weight: 700;
}

.nav-links {
  display: flex;
  gap: 1.25rem;
  align-items: center;
}

.nav-links a {
  font-family: 'Special Elite', monospace;
  font-size: 0.8rem;
  text-decoration: none;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-light);
  transition: color 0.2s;
}

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

/* ============================================
   Hero
   ============================================ */
.brand-cn {
  display: block;
  font-family: 'Noto Serif SC', serif;
  font-size: 0.35em;
  letter-spacing: 0.3em;
  color: var(--ink-light);
  margin-top: 8px;
}

h1 {
  font-family: 'Black Ops One', 'Special Elite', monospace;
  font-size: clamp(2.5rem, 6vw, 4rem);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  line-height: 1;
}

h2 {
  font-family: 'Special Elite', monospace;
  font-size: 0.85rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: 1.5rem;
}

.subtitle {
  font-family: 'Courier Prime', monospace;
  font-size: 1rem;
  color: var(--ink-light);
  letter-spacing: 0.05em;
}

/* ============================================
   Section
   ============================================ */
.section {
  padding: 3rem 0;
  border-bottom: 1px dashed var(--ink-gray);
}

/* ============================================
   Cards
   ============================================ */
.card {
  background: var(--paper);
  border: 1px solid var(--ink);
  padding: 2rem;
  position: relative;
  transition: all 0.3s ease;
}

.card:hover {
  transform: translateY(-3px);
  box-shadow: 4px 4px 0 var(--ink);
}

.card h3 {
  font-family: 'Special Elite', monospace;
  font-size: 1rem;
  letter-spacing: 0.05em;
  margin-bottom: 0.5rem;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.25rem;
}

/* ============================================
   Track Cards
   ============================================ */
.tracks {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.25rem;
  padding: 2rem 0;
}

.track-card {
  text-align: center;
  padding: 2.5rem 1.5rem;
}

.track-card .emoji {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.track-card.disabled {
  opacity: 0.45;
  pointer-events: none;
}

/* ============================================
   Tags — Classification Badges
   ============================================ */
.tag {
  display: inline-block;
  font-family: 'Special Elite', monospace;
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  padding: 0.3rem 0.75rem;
  border: 1px solid var(--ink);
  text-transform: uppercase;
}

.tag-easy {
  background: var(--brand-yellow);
  color: var(--ink);
  border-color: var(--ink);
}

.tag-medium {
  background: transparent;
  color: var(--ink);
}

.tag-hard {
  background: var(--stamp-red);
  color: #fff;
  border-color: var(--stamp-red);
}

.tag-category {
  background: var(--paper-dark);
  border-color: var(--ink-gray);
  color: var(--ink-light);
}

.tag-coming {
  background: transparent;
  border: 1px dashed var(--ink-gray);
  color: var(--ink-gray);
}

/* ============================================
   Steps — How it Works
   ============================================ */
.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}

.step {
  text-align: center;
  padding: 1.5rem;
}

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border: 3px solid var(--ink);
  font-family: 'Black Ops One', monospace;
  font-size: 1.25rem;
  margin-bottom: 1rem;
}

.step h3 {
  font-family: 'Special Elite', monospace;
  font-size: 1.1rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

.step p {
  font-size: 0.9rem;
  color: var(--ink-light);
  line-height: 1.5;
}

/* ============================================
   Buttons
   ============================================ */
.btn {
  display: inline-block;
  font-family: 'Special Elite', monospace;
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  padding: 0.75rem 1.5rem;
  border: 2px solid var(--ink);
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
  text-transform: uppercase;
}

.btn-primary {
  background: var(--brand-yellow);
  color: var(--ink);
}

.btn-primary:hover {
  transform: translate(-2px, -2px);
  box-shadow: 4px 4px 0 var(--ink);
}

.btn-secondary {
  background: transparent;
  color: var(--ink);
}

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

.btn-vote {
  width: 100%;
  margin-top: 12px;
  background: var(--brand-yellow);
  color: var(--ink);
  font-size: 0.9rem;
  padding: 0.85rem;
}

.btn-vote:hover {
  transform: translate(-2px, -2px);
  box-shadow: 4px 4px 0 var(--ink);
}

.btn-vote:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.btn-vote.selected {
  background: var(--stamp-red);
  color: #fff;
  border-color: var(--stamp-red);
}

/* ============================================
   Battle Arena
   ============================================ */
.battle-header {
  text-align: center;
  padding: 2.5rem 0 1.5rem;
  border-bottom: 2px solid var(--ink);
}

.battle-arena {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  padding: 1.5rem 0;
}

@media (max-width: 768px) {
  .battle-arena {
    grid-template-columns: 1fr;
  }
}

.battle-side {
  position: relative;
}

.battle-label {
  text-align: center;
  font-family: 'Special Elite', monospace;
  font-size: 0.85rem;
  letter-spacing: 0.15em;
  padding: 0.75rem;
  background: var(--paper-dark);
  border: 1px solid var(--ink);
  border-bottom: none;
  text-transform: uppercase;
}

.battle-label.revealed {
  background: var(--brand-yellow);
  font-weight: 700;
}

.battle-iframe {
  width: 100%;
  height: 500px;
  border: 2px solid var(--ink);
  background: #fff;
}

.battle-iframe.winner {
  border-color: var(--stamp-red);
  box-shadow: 0 0 0 3px var(--stamp-red);
}

.battle-waiting {
  text-align: center;
  padding: 4rem 2rem;
  font-family: 'Courier Prime', monospace;
}

.battle-actions {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 1.5rem;
}

/* ============================================
   Stamp Effect (for special elements)
   ============================================ */
.stamp {
  border: 4px solid var(--stamp-red);
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: 'Black Ops One', monospace;
  color: var(--stamp-red);
  transform: rotate(-15deg);
  opacity: 0.85;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

/* ============================================
   Footer
   ============================================ */
footer {
  padding: 2rem 0;
  margin-top: 2rem;
  border-top: 2px solid var(--ink);
  font-family: 'Courier Prime', monospace;
  font-size: 0.8rem;
  color: var(--ink-gray);
  text-align: center;
}

footer a { color: var(--ink-light); text-decoration: underline; }
footer a:hover { color: var(--stamp-red); }

/* ============================================
   Animations
   ============================================ */
.fade-in {
  animation: fadeInUp 0.4s ease-out;
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes stamp-in {
  0% { transform: scale(2) rotate(-15deg); opacity: 0; }
  50% { transform: scale(1.1) rotate(-15deg); opacity: 0.8; }
  100% { transform: scale(1) rotate(-15deg); opacity: 0.85; }
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 768px) {
  .container { padding: 0 1rem; }
  h1 { font-size: 2rem; }
  .card { padding: 1.5rem; }
  .card-grid { grid-template-columns: 1fr; }
  .battle-iframe { height: 350px; }
  .battle-actions { flex-direction: column; align-items: center; }
  .btn { width: 100%; text-align: center; }
}