/* =============================================
   GLOBAL STYLES - Editorial Data Report
   ============================================= */

:root {
  --color-bg: #ffffff;
  --color-bg-subtle: #fafbfc;
  --color-bg-muted: #f3f4f6;
  --color-text: #111827;
  --color-text-secondary: #4b5563;
  --color-text-muted: #9ca3af;
  --color-accent: #1e3a5f;
  --color-accent-light: #2563eb;
  --color-accent-muted: #93c5fd;
  --color-positive: #059669;
  --color-negative: #dc2626;
  --color-border: #e5e7eb;
  --color-border-subtle: #f3f4f6;

  --font-serif: 'Playfair Display', Georgia, 'Times New Roman', serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  --max-width: 720px;
  --max-width-wide: 960px;
  --section-gap: 48px;
  --section-gap-mobile: 36px;

  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
}

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

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

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  color: var(--color-text);
  background: var(--color-bg);
  overflow-x: hidden;
}

/* =============================================
   TYPOGRAPHY
   ============================================= */

.eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 2.5px;
  text-transform: uppercase;
  color: var(--color-accent-light);
  margin-bottom: 16px;
}

h1 {
  font-family: var(--font-serif);
  font-size: clamp(36px, 6vw, 64px);
  font-weight: 800;
  line-height: 1.1;
  color: var(--color-text);
  letter-spacing: -0.5px;
}

h2 {
  font-family: var(--font-serif);
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-text);
  letter-spacing: -0.3px;
  margin-bottom: 16px;
}

h3 {
  font-family: var(--font-sans);
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 12px;
}

p {
  color: var(--color-text-secondary);
  margin-bottom: 12px;
  max-width: 640px;
}

.lead {
  font-size: 18px;
  line-height: 1.8;
  color: var(--color-text-secondary);
}

.mono {
  font-family: var(--font-mono);
  font-size: 13px;
}

/* =============================================
   LAYOUT
   ============================================= */

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

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

.section {
  padding: var(--section-gap) 0;
}

.section--first {
  padding-top: 0;
}

/* =============================================
   NAVIGATION
   ============================================= */

.nav {
  position: fixed;
  right: 24px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 100;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.nav__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-border);
  border: none;
  cursor: pointer;
  transition: all 0.3s var(--ease-out);
  position: relative;
}

.nav__dot:hover {
  background: var(--color-accent-muted);
  transform: scale(1.4);
}

.nav__dot.active {
  background: var(--color-accent-light);
  transform: scale(1.5);
}

.nav__dot::after {
  content: attr(data-label);
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.5px;
  white-space: nowrap;
  color: var(--color-text-muted);
  opacity: 0;
  transition: opacity 0.2s;
  pointer-events: none;
}

.nav__dot:hover::after {
  opacity: 1;
}

/* =============================================
   HERO
   ============================================= */

.hero {
  min-height: 85vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 60px 24px;
  max-width: var(--max-width-wide);
  margin: 0 auto;
}

.hero__subtitle {
  font-size: 17px;
  line-height: 1.7;
  color: var(--color-text-secondary);
  margin-top: 20px;
  max-width: 540px;
}

.hero__author {
  margin-top: 48px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.hero__author-name {
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
}

.hero__author-detail {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-text-muted);
  letter-spacing: 0.3px;
}

.hero__author-link {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-accent-light);
  text-decoration: none;
  letter-spacing: 0.3px;
  transition: color 0.2s;
}

.hero__author-link:hover {
  color: var(--color-accent);
}

.hero__scroll-hint {
  margin-top: 64px;
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.hero__scroll-line {
  width: 40px;
  height: 1px;
  background: var(--color-border);
  position: relative;
  overflow: hidden;
}

.hero__scroll-line::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: var(--color-accent-light);
  animation: scrollLine 2s ease-in-out infinite;
}

@keyframes scrollLine {
  0% { left: -100%; }
  50% { left: 0%; }
  100% { left: 100%; }
}

/* =============================================
   STAT BLOCKS
   ============================================= */

.stat-block {
  margin: 24px 0;
}

.stat-number {
  font-family: var(--font-serif);
  font-size: clamp(48px, 8vw, 80px);
  font-weight: 800;
  line-height: 1;
  color: var(--color-text);
  letter-spacing: -2px;
}

.stat-label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-top: 8px;
}

/* =============================================
   SECTION DIVIDER
   ============================================= */

.divider {
  width: 40px;
  height: 1px;
  background: var(--color-border);
  margin: 0 0 48px;
}

.section-number {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 2px;
  color: var(--color-text-muted);
  margin-bottom: 8px;
}

/* =============================================
   INSIGHT BLOCK
   ============================================= */

.insight {
  padding: 14px 0;
  border-top: 1px solid var(--color-border);
  margin-top: 16px;
}

.insight__label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--color-accent-light);
  margin-bottom: 8px;
}

.insight__text {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* =============================================
   CHART CONTAINER
   ============================================= */

.chart-wrap {
  margin: 20px 0;
  position: relative;
}

.chart-wrap svg {
  width: 100%;
  display: block;
}

.chart-title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: 10px;
}

.chart-note {
  font-size: 13px;
  color: var(--color-text-muted);
  margin-top: 8px;
}

/* =============================================
   METRICS TABLE
   ============================================= */

.metrics-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: 13px;
}

.metrics-table th {
  text-align: left;
  padding: 8px 12px;
  border-bottom: 2px solid var(--color-border);
  font-size: 11px;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.metrics-table td {
  padding: 8px 12px;
  border-bottom: 1px solid var(--color-border-subtle);
  color: var(--color-text-secondary);
}

.metrics-table tr:nth-child(even) {
  background: var(--color-bg-subtle);
}

/* =============================================
   TOOLTIP
   ============================================= */

.tooltip {
  position: fixed;
  pointer-events: none;
  background: var(--color-text);
  color: #fff;
  padding: 8px 12px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.4;
  z-index: 1000;
  opacity: 0;
  transition: opacity 0.15s;
  max-width: 240px;
}

.tooltip.visible {
  opacity: 1;
}

/* =============================================
   TAKEAWAY CARDS
   ============================================= */

.takeaway {
  padding: 16px 0;
  border-bottom: 1px solid var(--color-border-subtle);
}

.takeaway__number {
  font-family: var(--font-serif);
  font-size: 32px;
  font-weight: 700;
  color: var(--color-accent-muted);
  margin-bottom: 8px;
}

.takeaway__title {
  font-family: var(--font-sans);
  font-size: 17px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
}

.takeaway__text {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* =============================================
   MODEL CARDS
   ============================================= */

.model-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 16px 0;
}

.model-card {
  padding: 24px;
  border: 1px solid var(--color-border);
  border-radius: 4px;
}

.model-card--lr {
  border-top: 3px solid var(--color-accent-light);
}

.model-card--rf {
  border-top: 3px solid var(--color-positive);
}

.model-card__name {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.model-card--lr .model-card__name { color: var(--color-accent-light); }
.model-card--rf .model-card__name { color: var(--color-positive); }

.metric-row {
  display: flex;
  justify-content: space-between;
  padding: 6px 0;
  border-bottom: 1px solid var(--color-border-subtle);
  font-size: 14px;
}

.metric-row__label { color: var(--color-text-muted); }
.metric-row__value { font-family: var(--font-mono); font-weight: 500; color: var(--color-text); }

/* =============================================
   FEATURE LIST
   ============================================= */

.feature-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 8px;
  margin: 16px 0;
}

.feature-tag {
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 6px 12px;
  background: var(--color-bg-muted);
  border-radius: 4px;
  color: var(--color-text-secondary);
}

.feature-tag--dropped {
  background: #fef2f2;
  color: var(--color-negative);
  text-decoration: line-through;
}

/* =============================================
   PIPELINE VISUAL
   ============================================= */

.pipeline {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 16px 0;
  flex-wrap: wrap;
}

.pipeline__step {
  padding: 8px 16px;
  background: var(--color-bg-muted);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-text-secondary);
  white-space: nowrap;
}

.pipeline__arrow {
  color: var(--color-text-muted);
  font-size: 14px;
}

/* =============================================
   FOOTER
   ============================================= */

.footer {
  padding: 36px 24px;
  text-align: center;
  border-top: 1px solid var(--color-border);
}

.footer__text {
  font-size: 13px;
  color: var(--color-text-muted);
}

/* =============================================
   ANIMATIONS
   ============================================= */

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.8s var(--ease-out), transform 0.8s var(--ease-out);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }

/* =============================================
   REDUCED MOTION
   ============================================= */

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .hero__scroll-line::after {
    animation: none;
  }
  html { scroll-behavior: auto; }
}

/* =============================================
   RESPONSIVE
   ============================================= */

@media (max-width: 768px) {
  .nav { display: none; }

  .hero {
    min-height: 90vh;
    padding: 60px 20px;
  }

  .container {
    padding: 0 20px;
  }

  .section {
    padding: var(--section-gap-mobile) 0;
  }

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

  .pipeline {
    flex-direction: column;
    align-items: flex-start;
  }

  .pipeline__arrow {
    transform: rotate(90deg);
  }

  .feature-list {
    grid-template-columns: 1fr;
  }

  h1 { letter-spacing: -0.3px; }
  h2 { letter-spacing: -0.2px; }
}

@media (max-width: 480px) {
  .hero__author {
    gap: 2px;
  }

  .stat-number {
    letter-spacing: -1px;
  }
}