/* Fast & Faithful - Tokyo Drift Theme */
/* Neon nights, racing stripes, and the streets of Shibuya */

/* ===== CSS Custom Properties ===== */
:root {
  /* Tokyo Drift Neon Colors */
  --color-primary: #0a0a0f;
  --color-primary-light: #14141c;
  --color-accent: #ff6b00;
  --color-accent-light: #ff8c33;
  --color-accent-subtle: rgba(255, 107, 0, 0.15);
  --color-neon-cyan: #00d4ff;
  --color-neon-pink: #ff0066;
  --color-neon-green: #00ff88;

  /* Dark Theme Neutrals */
  --color-bg: #08080c;
  --color-bg-alt: #0c0c12;
  --color-bg-card: #12121a;
  --color-bg-elevated: #1a1a24;
  --color-text: #e8e8ec;
  --color-text-muted: #9898a8;
  --color-text-light: #6e6e7a;
  --color-border: #2a2a38;
  --color-border-light: #1e1e28;

  /* Typography */
  --font-display: 'Crimson Pro', 'Georgia', serif;
  --font-body: 'Source Sans 3', 'Segoe UI', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Consolas', monospace;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2.5rem;
  --space-2xl: 4rem;
  --space-3xl: 6rem;

  /* Sizing */
  --max-width: 900px;
  --max-width-wide: 1100px;

  /* Neon Glow Effects */
  --glow-orange: 0 0 20px rgba(255, 107, 0, 0.5), 0 0 40px rgba(255, 107, 0, 0.25);
  --glow-cyan: 0 0 20px rgba(0, 212, 255, 0.5), 0 0 40px rgba(0, 212, 255, 0.25);
  --glow-pink: 0 0 20px rgba(255, 0, 102, 0.5), 0 0 40px rgba(255, 0, 102, 0.25);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.5);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.6);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.7);

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;
}

/* ===== Reset & Base ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  overflow-x: hidden;
}

/* Subtle scanline texture - Tokyo nights aesthetic */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  opacity: 0.02;
  background-image:
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 2px,
      rgba(255, 107, 0, 0.03) 2px,
      rgba(255, 107, 0, 0.03) 4px
    );
  z-index: 9999;
}

/* ===== Typography ===== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.25;
  color: var(--color-text);
}

h1 { font-size: clamp(2.25rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.75rem, 3.5vw, 2.25rem); }
h3 { font-size: clamp(1.25rem, 2.5vw, 1.5rem); }
h4 { font-size: 1.125rem; }

p {
  margin-bottom: 1em;
}

p:last-child {
  margin-bottom: 0;
}

a {
  color: var(--color-neon-cyan);
  text-decoration: none;
  transition: color var(--transition-fast), text-shadow var(--transition-fast);
}

a:hover {
  color: var(--color-accent);
  text-shadow: 0 0 10px rgba(255, 107, 0, 0.5);
}

strong {
  font-weight: 600;
  color: var(--color-text);
}

em {
  font-style: italic;
}

/* ===== Layout ===== */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.container--wide {
  max-width: var(--max-width-wide);
}

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

/* ===== Hero Section ===== */
.hero {
  position: relative;
  min-height: auto;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-2xl) var(--space-lg) var(--space-xl);
  background:
    radial-gradient(ellipse at 30% 0%, rgba(255, 107, 0, 0.12) 0%, transparent 50%),
    radial-gradient(ellipse at 70% 100%, rgba(0, 212, 255, 0.08) 0%, transparent 50%),
    linear-gradient(180deg, var(--color-bg) 0%, var(--color-bg-alt) 100%);
  overflow: hidden;
}

/* Racing stripe at top */
.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    var(--color-accent) 20%,
    var(--color-neon-cyan) 50%,
    var(--color-accent) 80%,
    transparent 100%
  );
  box-shadow: var(--glow-orange);
}

/* Subtle bottom border */
.hero::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 10%;
  right: 10%;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent,
    var(--color-border) 20%,
    var(--color-border) 80%,
    transparent
  );
}

.hero__content {
  position: relative;
  z-index: 1;
  max-width: 800px;
}

.hero__badge {
  display: inline-block;
  padding: var(--space-xs) var(--space-md);
  margin-bottom: var(--space-lg);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-neon-cyan);
  background: rgba(0, 212, 255, 0.1);
  border: 1px solid rgba(0, 212, 255, 0.3);
  border-radius: 100px;
  animation: fadeInDown 0.6s ease both;
  text-shadow: 0 0 10px rgba(0, 212, 255, 0.5);
}

.hero__title {
  margin-bottom: var(--space-sm);
  font-weight: 700;
  letter-spacing: -0.02em;
  animation: fadeInUp 0.6s ease 0.1s both;
}

.hero__title-accent {
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-light) 50%, var(--color-neon-cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  filter: drop-shadow(0 0 20px rgba(255, 107, 0, 0.4));
}

.hero__subtitle {
  margin-bottom: var(--space-xl);
  font-family: var(--font-display);
  font-size: clamp(1.125rem, 2.5vw, 1.375rem);
  font-weight: 400;
  font-style: italic;
  color: var(--color-text-muted);
  animation: fadeInUp 0.6s ease 0.2s both;
}

.hero__authors {
  margin-bottom: var(--space-sm);
  font-size: 1.0625rem;
  animation: fadeInUp 0.6s ease 0.3s both;
}

.hero__authors a {
  font-weight: 500;
}

.hero__equal {
  font-size: 0.875rem;
  color: var(--color-text-light);
  animation: fadeInUp 0.6s ease 0.35s both;
}

.hero__affiliation {
  margin-top: var(--space-md);
  font-size: 1rem;
  color: var(--color-text-muted);
  animation: fadeInUp 0.6s ease 0.4s both;
}

.hero__course {
  margin-top: var(--space-sm);
  font-size: 0.875rem;
  font-style: italic;
  color: var(--color-text-light);
  animation: fadeInUp 0.6s ease 0.45s both;
}

.hero__actions {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  margin-top: var(--space-xl);
  animation: fadeInUp 0.6s ease 0.5s both;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 500;
  text-decoration: none;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-base);
}

.btn--primary {
  color: #fff;
  background: linear-gradient(135deg, var(--color-accent) 0%, #cc5500 100%);
  box-shadow: var(--shadow-md), 0 0 20px rgba(255, 107, 0, 0.3);
  border: 1px solid rgba(255, 140, 51, 0.3);
}

.btn--primary:hover {
  color: #fff;
  background: linear-gradient(135deg, var(--color-accent-light) 0%, var(--color-accent) 100%);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg), var(--glow-orange);
}

.btn--outline {
  color: var(--color-text);
  background: transparent;
  border: 1.5px solid var(--color-border);
}

.btn--outline:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
  background: rgba(255, 107, 0, 0.05);
  box-shadow: 0 0 15px rgba(255, 107, 0, 0.2);
}

.btn__icon {
  font-size: 1em;
}

/* ===== Teaser Figure ===== */
.teaser {
  padding: var(--space-lg) 0 var(--space-2xl);
  background: var(--color-bg);
}

.teaser__figure {
  position: relative;
  max-width: 1000px;
  margin: 0 auto;
  padding: var(--space-lg);
  background: var(--color-bg-card);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

/* Neon racing stripe on figure */
.teaser__figure::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-neon-cyan), var(--color-neon-pink));
  box-shadow: 0 0 15px rgba(255, 107, 0, 0.5);
}

.teaser__image {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
}

.teaser__caption {
  margin-top: var(--space-lg);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border-light);
  font-size: 0.9375rem;
  line-height: 1.6;
  color: var(--color-text-muted);
  text-align: center;
}

.teaser__caption strong {
  color: var(--color-accent-light);
}

/* ===== Section Headers ===== */
.section-header {
  margin-bottom: var(--space-xl);
  text-align: center;
}

.section-header__title {
  position: relative;
  display: inline-block;
  padding-bottom: var(--space-sm);
}

.section-header__title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--color-accent), var(--color-neon-cyan), transparent);
  border-radius: 2px;
  box-shadow: 0 0 10px rgba(255, 107, 0, 0.5);
}

/* Left-aligned variant */
.section-header--left {
  text-align: left;
}

.section-header--left .section-header__title::after {
  left: 0;
  transform: none;
  background: linear-gradient(90deg, var(--color-accent), var(--color-neon-cyan), transparent);
}

/* ===== Abstract ===== */
.abstract {
  background: var(--color-bg-alt);
}

.abstract__content {
  max-width: 750px;
  margin: 0 auto;
  font-size: 1.0625rem;
  text-align: justify;
  hyphens: auto;
}

.abstract__note {
  margin-top: var(--space-xl);
  padding: var(--space-lg);
  background: rgba(0, 212, 255, 0.08);
  border-left: 3px solid var(--color-neon-cyan);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-size: 0.9375rem;
  box-shadow: inset 0 0 30px rgba(0, 212, 255, 0.05);
}

.abstract__note strong {
  color: var(--color-neon-cyan);
  text-shadow: 0 0 10px rgba(0, 212, 255, 0.3);
}

/* ===== Method Section ===== */
.method {
  background: var(--color-bg);
}

.method__intro {
  max-width: 750px;
  margin-bottom: var(--space-xl);
}

.method__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
  margin-top: var(--space-xl);
}

/* Center the last item when there are 3 cards */
.method__grid > *:last-child:nth-child(odd) {
  grid-column: 1 / -1;
  max-width: 50%;
  justify-self: center;
}

.method-card {
  padding: var(--space-lg);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.method-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-accent), transparent);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.method-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md), 0 0 30px rgba(255, 107, 0, 0.15);
  transform: translateY(-4px);
}

.method-card:hover::before {
  opacity: 1;
}

.method-card__title {
  margin-bottom: var(--space-md);
  font-size: 1.125rem;
  color: var(--color-accent-light);
}

.method-card__text {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
}

/* ===== Results Section ===== */
.results {
  background: var(--color-bg-alt);
}

/* Performance Table */
.results-table {
  width: 100%;
  margin: var(--space-xl) 0;
  border-collapse: collapse;
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
}

.results-table th,
.results-table td {
  padding: var(--space-md) var(--space-lg);
  text-align: left;
}

.results-table thead {
  background: linear-gradient(135deg, var(--color-primary-light) 0%, #1a1a28 100%);
  border-bottom: 2px solid var(--color-accent);
}

.results-table th {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-accent-light);
}

.results-table tbody tr {
  border-bottom: 1px solid var(--color-border-light);
  transition: background var(--transition-fast);
}

.results-table tbody tr:last-child {
  border-bottom: none;
}

.results-table tbody tr:hover {
  background: rgba(255, 107, 0, 0.05);
}

.results-table td {
  font-size: 0.9375rem;
}

.results-table .model-name {
  font-weight: 600;
  color: var(--color-text);
}

.results-table .highlight-baseline {
  background: rgba(0, 212, 255, 0.08);
}

.results-table .highlight-cached {
  background: rgba(0, 255, 136, 0.08);
}

.speedup-badge {
  display: inline-block;
  padding: var(--space-xs) var(--space-sm);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-neon-green);
  background: rgba(0, 255, 136, 0.15);
  border-radius: var(--radius-sm);
  border: 1px solid rgba(0, 255, 136, 0.3);
  text-shadow: 0 0 8px rgba(0, 255, 136, 0.4);
}

/* Figure Cards */
.figure-card {
  margin: var(--space-xl) 0;
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-border);
}

.figure-card__image {
  display: block;
  width: 100%;
  height: auto;
  background: var(--color-bg-elevated);
}

.figure-card__caption {
  padding: var(--space-lg);
  font-size: 0.9375rem;
  line-height: 1.6;
  color: var(--color-text-muted);
  border-top: 1px solid var(--color-border-light);
}

.figure-card__caption strong {
  color: var(--color-accent-light);
}

/* Key Findings - Neon bordered card */
.findings {
  margin-top: var(--space-2xl);
  padding: var(--space-xl);
  background: linear-gradient(135deg, #12121a 0%, #1a1a28 100%);
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-accent);
  box-shadow: 0 0 40px rgba(255, 107, 0, 0.15), inset 0 0 60px rgba(255, 107, 0, 0.03);
  position: relative;
  overflow: hidden;
}

/* Racing stripe on findings */
.findings::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-neon-cyan), var(--color-neon-pink), var(--color-accent));
  box-shadow: 0 0 20px rgba(255, 107, 0, 0.6);
}

.findings__title {
  margin-bottom: var(--space-lg);
  color: var(--color-accent-light);
  font-size: 1.375rem;
  text-shadow: 0 0 20px rgba(255, 107, 0, 0.4);
}

.findings__list {
  list-style: none;
  display: grid;
  gap: var(--space-md);
}

.findings__item {
  position: relative;
  padding-left: var(--space-xl);
  font-size: 0.9375rem;
  line-height: 1.6;
  color: var(--color-text-muted);
}

.findings__item::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.5em;
  width: 8px;
  height: 8px;
  background: var(--color-accent);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--color-accent);
}

.findings__item strong {
  color: var(--color-neon-cyan);
  text-shadow: 0 0 8px rgba(0, 212, 255, 0.4);
}

/* ===== Citation Section ===== */
.citation {
  background: var(--color-bg);
}

.citation__block {
  max-width: 750px;
  margin: 0 auto;
  padding: var(--space-lg);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow-x: auto;
  position: relative;
}

/* Accent stripe on citation */
.citation__block::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--color-accent), var(--color-neon-cyan));
}

.citation__block pre {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--color-text-muted);
  white-space: pre-wrap;
  word-break: break-word;
}

/* ===== Footer ===== */
.footer {
  padding: var(--space-xl) 0;
  background: linear-gradient(180deg, var(--color-bg-alt) 0%, var(--color-primary) 100%);
  color: var(--color-text-muted);
  text-align: center;
  position: relative;
}

.footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-border), transparent);
}

.footer__links {
  display: flex;
  justify-content: center;
  gap: var(--space-lg);
  margin-bottom: var(--space-md);
}

.footer__link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  color: var(--color-text-muted);
  background: rgba(255, 107, 0, 0.1);
  border: 1px solid var(--color-border);
  border-radius: 50%;
  transition: all var(--transition-base);
}

.footer__link:hover {
  color: var(--color-accent);
  background: rgba(255, 107, 0, 0.2);
  border-color: var(--color-accent);
  transform: translateY(-2px);
  box-shadow: 0 0 20px rgba(255, 107, 0, 0.4);
}

.footer__text {
  font-size: 0.875rem;
}

.footer__text a {
  color: var(--color-neon-cyan);
}

.footer__text a:hover {
  color: var(--color-accent);
}

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

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

/* Scroll-triggered animations */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Staggered delays for children */
.stagger-children > *:nth-child(1) { transition-delay: 0.1s; }
.stagger-children > *:nth-child(2) { transition-delay: 0.2s; }
.stagger-children > *:nth-child(3) { transition-delay: 0.3s; }
.stagger-children > *:nth-child(4) { transition-delay: 0.4s; }
.stagger-children > *:nth-child(5) { transition-delay: 0.5s; }

/* ===== Responsive ===== */
@media (max-width: 768px) {
  :root {
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
  }

  .hero {
    min-height: auto;
    padding: var(--space-2xl) var(--space-md);
  }

  .hero__actions {
    flex-direction: column;
    align-items: center;
  }

  .container {
    padding: 0 var(--space-md);
  }

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

  .method__grid > *:last-child:nth-child(odd) {
    max-width: 100%;
  }

  .results-table {
    font-size: 0.875rem;
  }

  .results-table th,
  .results-table td {
    padding: var(--space-sm) var(--space-md);
  }

  .findings {
    padding: var(--space-lg);
  }
}

/* ===== Print Styles ===== */
@media print {
  body::before {
    display: none;
  }

  .hero::before,
  .hero::after {
    display: none;
  }

  .btn {
    border: 1px solid currentColor;
  }

  .animate-on-scroll {
    opacity: 1;
    transform: none;
  }

  /* Override dark theme for print */
  :root {
    --color-bg: #fff;
    --color-bg-alt: #f5f5f5;
    --color-bg-card: #fff;
    --color-text: #222;
    --color-text-muted: #555;
  }
}