/* -- CUSTOM PROPERTIES -- */
:root {
  --bg:          #0d0d0d;
  --bg-card:     #161616;
  --border:      #1e1e1e;
  --accent:      #00d4ff;
  --accent-glow: rgba(0, 212, 255, 0.12);
  --purple:      #7c3aed;
  --text:        #e2e8f0;
  --muted:       #64748b;
  --radius:      12px;
  --transition:  0.2s ease;
  --nav-bg:      rgba(13, 13, 13, 0.8);
}

[data-theme="light"] {
  --bg:      #f8fafc;
  --bg-card: #ffffff;
  --border:  #e2e8f0;
  --text:    #0f172a;
  --muted:   #475569;
  --nav-bg:  rgba(255, 255, 255, 0.85);
}

/* -- RESET & BASE ---*/

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

html, body {
  overflow-x: hidden;
  width: 100%;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', sans-serif;
  background-color: var(--bg);
  color: var(--text);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.3s ease, color 0.3s ease;
}

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

a {
  color: var(--accent);
  text-decoration: none;
  transition: opacity var(--transition);
}

a:hover { opacity: 0.75; }

/*--- SCROLL ANIMATIONS --- */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

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

.reveal-stagger > *:nth-child(1) { transition-delay: 0.05s; }
.reveal-stagger > *:nth-child(2) { transition-delay: 0.12s; }
.reveal-stagger > *:nth-child(3) { transition-delay: 0.19s; }
.reveal-stagger > *:nth-child(4) { transition-delay: 0.26s; }

/*--- NAVBAR --- */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  background: var(--nav-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  transition: background 0.3s ease, border-color 0.3s ease;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 6px var(--accent);
  flex-shrink: 0;
}

.nav-title {
  font-weight: 700;
  font-size: 0.9rem;
  letter-spacing: 0.01em;
  color: var(--text);
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-pills {
  display: flex;
  align-items: center;
  gap: 6px;
}

.pill {
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--muted);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 3px 10px;
  letter-spacing: 0.02em;
  transition: border-color var(--transition), color var(--transition);
}

.pill:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* Theme toggle */
.toggle-btn {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--bg-card);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--muted);
  transition: all 0.2s;
}

.toggle-btn:hover { border-color: var(--accent); color: var(--accent); }

.toggle-btn svg { width: 15px; height: 15px; stroke-width: 1.5; }

/* --- HERO SECTION --- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 40px 24px 32px;
  margin-bottom: 0;
  background-color: #0d0d0d;
  background-image:
    linear-gradient(rgba(0, 212, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 212, 255, 0.04) 1px, transparent 1px);
  background-size: 40px 40px;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 400px;
  background: radial-gradient(ellipse, rgba(0, 180, 120, 0.08) 0%, transparent 65%);
  pointer-events: none;
}

[data-theme="light"] .hero {
  background-color: #f0f9ff;
  background-image:
    linear-gradient(rgba(0, 212, 255, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 212, 255, 0.06) 1px, transparent 1px);
  background-size: 40px 40px;
}

[data-theme="light"] .hero::before {
  background: radial-gradient(ellipse, rgba(0, 212, 255, 0.08) 0%, transparent 65%);
}

.hero-eyebrow {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
}

.hero h1 {
  font-size: 72px;
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.03em;
  color: #e2e8f0;
  margin-bottom: 10px;
}

[data-theme="light"] .hero h1 { color: #0f172a; }

.hero h1 .highlight {
  background: linear-gradient(90deg, #00d4ff, #7c3aed);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 14px;
  color: #64748b;
  white-space: nowrap;
  margin: 0 auto;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 100%;
}

/* --- Inline Stats Strip --- */
.hero-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 32px;
  margin-top: 40px;
}

.hero-stat { text-align: center; }

.hero-stat-val {
  font-size: 24px;
  font-weight: 700;
  color: var(--text);
}

.hero-stat-label {
  font-size: 10px;
  color: var(--muted);
  letter-spacing: 0.08em;
  margin-top: 4px;
}

.hero-divider {
  width: 1px;
  height: 36px;
  background: var(--border);
}

/* --- SHARED SECTION STYLES ---*/
section {
  padding: 0 24px 64px;
  max-width: 1200px;
  margin: 0 auto;
}

/* Charts section sits just below hero */
section:first-of-type {
  padding-top: 24px;
}

/* Key Findings section has slightly more breathing room */
section:last-of-type {
  padding-top: 32px;
}

.section-header {
  margin-bottom: 36px;
}

.section-label {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 6px;
}

.section-title {
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
}

/*--- CHARTS SECTION ---*/
.charts-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 16px;
}

.chart-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  min-width: 0;
  transition: transform var(--transition), border-color var(--transition),
              box-shadow var(--transition), background-color 0.3s ease;
}

.chart-card:hover {
  transform: translateY(-2px);
  border-color: rgba(0, 212, 255, 0.25);
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.35);
}

.chart-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 14px;
  gap: 8px;
}

.chart-title {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: 0.01em;
  line-height: 1.3;
  min-width: 0;
}

.chart-stat {
  text-align: right;
  flex-shrink: 0;
}

.chart-stat-value {
  display: block;
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: -0.02em;
  line-height: 1;
}

.chart-stat-value--purple { color: var(--purple); }

.chart-stat-label {
  display: block;
  font-size: 0.62rem;
  font-weight: 500;
  color: var(--muted);
  margin-top: 2px;
}

/* Canvas wrappers */
.chart-canvas-wrapper {
  position: relative;
  width: 100%;
  height: 255px;
}

.chart-canvas-wrapper--tall    { height: 215px; }
.chart-canvas-wrapper--doughnut { height: 260px; }

.chart-canvas-wrapper canvas {
  display: block;
  max-width: 100%;
}

/* --- KEY FINDINGS ---- */
.findings-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 14px;
}

.finding-card {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  min-width: 0;
  transition: transform var(--transition), border-color var(--transition),
              box-shadow var(--transition), background-color 0.3s ease;
}

.finding-card:hover {
  transform: translateY(-2px);
  border-color: rgba(0, 212, 255, 0.2);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.finding-icon-box {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: rgba(0, 212, 255, 0.08);
  border: 1px solid rgba(0, 212, 255, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.finding-icon-box svg {
  width: 16px;
  height: 16px;
  stroke: var(--accent);
  stroke-width: 1.5;
  fill: none;
}

.finding-content { flex: 1; min-width: 0; }

.finding-number {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: -0.03em;
  line-height: 1;
  margin-bottom: 4px;
}

.finding-title {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.3;
  margin-bottom: 4px;
}

.finding-desc {
  font-size: 0.74rem;
  color: var(--muted);
  line-height: 1.55;
}

/* --- FOOTER --- */
footer {
  border-top: 1px solid var(--border);
  padding: 24px;
  transition: border-color 0.3s ease;
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.footer-left {
  font-size: 0.8rem;
  color: var(--muted);
}

.footer-right {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.footer-tech-pill {
  font-size: 0.68rem;
  font-weight: 500;
  color: var(--accent);
  background: rgba(0, 212, 255, 0.07);
  border: 1px solid rgba(0, 212, 255, 0.18);
  border-radius: 20px;
  padding: 3px 10px;
}

.footer-github {
  font-size: 0.68rem;
  font-weight: 500;
  color: var(--muted);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 3px 10px;
  transition: color var(--transition), border-color var(--transition);
}

.footer-github:hover {
  color: var(--accent);
  border-color: var(--accent);
  opacity: 1;
}

/*--- RESPONSIVE — TABLET (≤1024px) --- */
@media (max-width: 1024px) {
  section {
    padding: 64px 16px;
  }

  header {
    padding: 0 16px;
  }

  .hero {
    padding: 100px 16px 64px;
  }

  footer {
    padding: 20px 16px;
  }

  /* keep 2-col layout on tablet */
  .charts-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }

  .findings-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }

  .stat-item {
    padding: 0 20px;
  }
}

/* --- RESPONSIVE — MOBILE (≤640px) --- */
@media (max-width: 640px) {
  header {
    padding: 0 16px;
  }

  /* Hide tech pills on mobile — keep only toggle */
  .nav-pills {
    display: none;
  }

  .hero {
    padding: 88px 16px 56px;
  }

  .hero h1 {
    font-size: 24px;
  }

  section {
    padding: 56px 16px;
  }

  /* Stats: wrap to 2×2 */
  .hero-stats {
    gap: 8px;
  }

  .stat-divider {
    display: none;
  }

  .stat-item {
    width: 46%;
    padding: 12px 8px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 10px;
  }

  /* Charts stacked on mobile */
  .charts-grid {
    grid-template-columns: 1fr;
  }

  /* Findings stacked on mobile */
  .findings-grid {
    grid-template-columns: 1fr;
  }

  footer {
    padding: 20px 16px;
  }

  .footer-inner {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }

  .footer-right {
    justify-content: center;
  }
}

/* ---- AI insights additions ---- */
.section-subtitle {
  color: #64748b;
  font-size: 0.85rem;
  margin-top: 4px;
}

.loading-insights {
  color: #64748b;
  font-size: 0.9rem;
  grid-column: 1 / -1;
  text-align: center;
  padding: 3rem 0;
}