/* ═══════════════════════════════════════════════
   EQUIVISION – STYLE.CSS
   Dark premium UI · Glassmorphism · Syne + DM Sans
═══════════════════════════════════════════════ */

:root {
  --bg:           #0a0f1e;
  --bg-mid:       #0f172a;
  --card:         #131e35;
  --card-hover:   #182340;
  --border:       rgba(255,255,255,0.07);
  --border-lit:   rgba(255,255,255,0.15);
  --green:        #22c55e;
  --green-dim:    rgba(34,197,94,0.15);
  --green-glow:   rgba(34,197,94,0.35);
  --red:          #ef4444;
  --red-dim:      rgba(239,68,68,0.15);
  --red-glow:     rgba(239,68,68,0.35);
  --yellow:       #f59e0b;
  --blue:         #3b82f6;
  --blue-dim:     rgba(59,130,246,0.15);
  --text:         #e2e8f0;
  --text-muted:   #64748b;
  --text-dim:     #94a3b8;
  --accent:       #38bdf8;
  --radius:       16px;
  --radius-sm:    10px;
  --shadow:       0 4px 32px rgba(0,0,0,0.4);
  --shadow-card:  0 2px 20px rgba(0,0,0,0.3);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: 'DM Sans', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
}

/* ── Background FX ── */
.bg-grid {
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background-image:
    linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
  background-size: 48px 48px;
}
.bg-orb {
  position: fixed; z-index: 0; pointer-events: none;
  border-radius: 50%; filter: blur(120px); opacity: 0.18;
}
.orb-1 {
  width: 600px; height: 600px;
  background: radial-gradient(circle, #22c55e, transparent 70%);
  top: -200px; left: -200px;
}
.orb-2 {
  width: 500px; height: 500px;
  background: radial-gradient(circle, #3b82f6, transparent 70%);
  bottom: -100px; right: -100px;
}

/* ── Navbar ── */
.navbar {
  position: sticky; top: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 48px;
  background: rgba(10,15,30,0.8);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}
.nav-logo {
  display: flex; align-items: center; gap: 10px;
  font-family: 'Syne', sans-serif;
  font-size: 22px; font-weight: 800;
  letter-spacing: -0.5px;
}
.logo-icon { font-size: 20px; }
.logo-text .accent { color: var(--accent); }
.nav-links {
  display: flex; align-items: center; gap: 28px;
  font-size: 14px; font-weight: 500;
}
.nav-links a {
  color: var(--text-dim); text-decoration: none;
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--text); }
.nav-badge {
  background: var(--green-dim);
  color: var(--green);
  border: 1px solid var(--green);
  font-size: 11px; font-weight: 700;
  padding: 2px 10px; border-radius: 20px;
  letter-spacing: 0.5px;
}

/* ── Hero ── */
.hero {
  position: relative; z-index: 1;
  max-width: 900px; margin: 0 auto;
  padding: 100px 24px 80px;
  text-align: center;
}
.hero-eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 12px; font-weight: 500; letter-spacing: 1px;
  text-transform: uppercase; color: var(--text-muted);
  margin-bottom: 28px;
}
.dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--green);
}
.dot-pulse {
  animation: pulse-dot 2s infinite;
}
@keyframes pulse-dot {
  0%, 100% { box-shadow: 0 0 0 0 var(--green-glow); }
  50% { box-shadow: 0 0 0 6px transparent; }
}
.hero-title {
  font-family: 'Syne', sans-serif;
  font-size: clamp(48px, 8vw, 80px);
  font-weight: 800; line-height: 1.05;
  letter-spacing: -2px;
  margin-bottom: 24px;
}
.title-gradient {
  background: linear-gradient(135deg, var(--green) 0%, var(--accent) 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-sub {
  font-size: 18px; line-height: 1.7;
  color: var(--text-dim);
  max-width: 620px; margin: 0 auto 48px;
}
.hero-sub strong { color: var(--text); }

.hero-stats {
  display: flex; justify-content: center;
  gap: 16px; flex-wrap: wrap;
  margin-bottom: 48px;
}
.stat-pill {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 50px;
  padding: 10px 20px;
  display: flex; align-items: center; gap: 10px;
}
.stat-num {
  font-family: 'Syne', sans-serif;
  font-weight: 800; font-size: 18px;
  color: var(--accent);
}
.stat-label {
  font-size: 13px; color: var(--text-dim);
  max-width: 160px; text-align: left;
  line-height: 1.3;
}

.cta-btn {
  display: inline-flex; align-items: center; gap: 10px;
  background: linear-gradient(135deg, var(--green) 0%, #16a34a 100%);
  color: #0a1a0a;
  font-family: 'Syne', sans-serif;
  font-weight: 700; font-size: 16px;
  padding: 16px 36px; border-radius: 50px;
  text-decoration: none;
  box-shadow: 0 0 40px var(--green-glow);
  transition: transform 0.2s, box-shadow 0.2s;
}
.cta-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 60px var(--green-glow);
}

/* ── Section ── */
.section {
  position: relative; z-index: 1;
  max-width: 1000px; margin: 0 auto;
  padding: 80px 24px;
}
.section-label {
  font-size: 11px; font-weight: 700; letter-spacing: 2px;
  text-transform: uppercase; color: var(--accent);
  margin-bottom: 12px;
}
.section-title {
  font-family: 'Syne', sans-serif;
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 800; letter-spacing: -1px;
  margin-bottom: 12px;
}
.section-desc {
  font-size: 16px; color: var(--text-dim);
  line-height: 1.7; max-width: 600px;
  margin-bottom: 40px;
}

/* ── Upload ── */
.upload-area {
  border: 2px dashed var(--border-lit);
  border-radius: var(--radius);
  padding: 60px 40px;
  text-align: center;
  background: var(--card);
  cursor: pointer;
  transition: border-color 0.3s, background 0.3s;
}
.upload-area:hover, .upload-area.drag-over {
  border-color: var(--accent);
  background: rgba(56,189,248,0.05);
}
.upload-icon {
  color: var(--text-muted);
  margin-bottom: 16px;
  transition: color 0.3s;
}
.upload-area:hover .upload-icon { color: var(--accent); }
.upload-title {
  font-family: 'Syne', sans-serif;
  font-size: 18px; font-weight: 700;
  margin-bottom: 8px;
}
.upload-hint {
  font-size: 14px; color: var(--text-muted);
  margin-bottom: 24px;
}
.file-status {
  margin-top: 16px;
  font-size: 14px; font-weight: 500;
  color: var(--green);
}
.upload-actions {
  display: flex; justify-content: center;
  margin-top: 28px;
}

.btn-primary {
  display: inline-flex; align-items: center; gap: 10px;
  background: linear-gradient(135deg, var(--accent) 0%, var(--blue) 100%);
  color: #fff;
  font-family: 'Syne', sans-serif;
  font-weight: 700; font-size: 16px;
  padding: 14px 40px; border-radius: 50px;
  border: none; cursor: pointer;
  box-shadow: 0 0 30px rgba(56,189,248,0.3);
  transition: transform 0.2s, box-shadow 0.2s, opacity 0.2s;
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 50px rgba(56,189,248,0.5);
}
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

.btn-secondary {
  display: inline-block;
  background: transparent;
  border: 1px solid var(--border-lit);
  color: var(--text);
  font-family: 'DM Sans', sans-serif;
  font-size: 14px; font-weight: 500;
  padding: 10px 24px; border-radius: 50px;
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s;
}
.btn-secondary:hover {
  background: rgba(255,255,255,0.06);
  border-color: var(--text-dim);
}

.spinner {
  width: 18px; height: 18px;
  border: 2px solid rgba(255,255,255,0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.error-msg {
  margin-top: 20px;
  text-align: center;
  color: var(--red);
  font-size: 14px;
  font-weight: 500;
  min-height: 20px;
}

/* ── Verdict Banner ── */
.verdict-banner {
  display: flex; align-items: center; gap: 12px;
  padding: 16px 24px; border-radius: var(--radius-sm);
  margin-bottom: 36px;
  font-family: 'Syne', sans-serif;
  font-size: 18px; font-weight: 700;
  border: 1px solid;
}
.verdict-banner.biased {
  background: var(--red-dim);
  border-color: var(--red);
  color: var(--red);
}
.verdict-banner.fair {
  background: var(--green-dim);
  border-color: var(--green);
  color: var(--green);
}

/* ── Cards Grid ── */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 20px;
  margin-bottom: 28px;
}
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: transform 0.2s, border-color 0.2s, box-shadow 0.2s;
}
.card:hover {
  transform: translateY(-4px);
  border-color: var(--border-lit);
  box-shadow: var(--shadow-card);
}
.card-header {
  display: flex; align-items: center; gap: 8px;
  margin-bottom: 16px;
}
.card-icon { font-size: 18px; }
.card-title {
  font-size: 13px; font-weight: 500;
  color: var(--text-muted); flex: 1;
}
.card-metric {
  font-family: 'Syne', sans-serif;
  font-size: 42px; font-weight: 800;
  letter-spacing: -2px; line-height: 1;
  margin-bottom: 12px;
}
.card-metric.red { color: var(--red); }
.card-metric.green { color: var(--green); }
.accent-green { color: var(--green); }
.accent-red { color: var(--red); }

.card-bar {
  height: 6px; background: rgba(255,255,255,0.08);
  border-radius: 3px; overflow: hidden; margin-bottom: 12px;
}
.bar-fill {
  height: 100%; border-radius: 3px;
  transition: width 1s cubic-bezier(0.4,0,0.2,1);
}
.bar-fill.red { background: var(--red); box-shadow: 0 0 8px var(--red-glow); }
.bar-fill.green { background: var(--green); box-shadow: 0 0 8px var(--green-glow); }

.card-tag {
  display: inline-block; font-size: 12px; font-weight: 600;
  padding: 4px 12px; border-radius: 20px;
}
.card-tag.red { background: var(--red-dim); color: var(--red); }
.card-tag.green { background: var(--green-dim); color: var(--green); }
.tag-neutral { background: rgba(255,255,255,0.07); color: var(--text-muted); }

.parity-scale {
  display: flex; align-items: center; gap: 8px;
  margin-top: 12px;
  font-size: 11px; color: var(--text-muted);
}
.parity-track {
  flex: 1; height: 6px;
  background: rgba(255,255,255,0.08);
  border-radius: 3px; position: relative; overflow: visible;
}
.parity-thumb {
  position: absolute; top: 50%;
  width: 12px; height: 12px; border-radius: 50%;
  background: var(--accent);
  transform: translate(-50%, -50%);
  box-shadow: 0 0 8px var(--accent);
  transition: left 1s cubic-bezier(0.4,0,0.2,1);
}

/* ── Tooltip ── */
.tooltip-wrap { position: relative; }
.tooltip-trigger {
  display: inline-flex; align-items: center; justify-content: center;
  width: 18px; height: 18px; border-radius: 50%;
  background: rgba(255,255,255,0.1);
  font-size: 11px; color: var(--text-muted);
  cursor: help;
}
.tooltip-box {
  display: none;
  position: absolute; top: -8px; right: 24px;
  width: 220px;
  background: #1e293b;
  border: 1px solid var(--border-lit);
  border-radius: var(--radius-sm);
  padding: 12px;
  font-size: 12px; color: var(--text-dim); line-height: 1.5;
  z-index: 10;
  box-shadow: var(--shadow);
}
.tooltip-wrap:hover .tooltip-box { display: block; }

/* ── AI Card ── */
.ai-card {
  background: linear-gradient(135deg, #0f172a 0%, #131e35 100%);
  border: 1px solid rgba(56,189,248,0.25);
  border-radius: var(--radius);
  padding: 28px;
  position: relative; overflow: hidden;
}
.ai-card::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--green), var(--blue));
}
.ai-card-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 16px;
}
.ai-badge {
  background: var(--blue-dim);
  color: var(--accent);
  border: 1px solid var(--blue);
  font-size: 12px; font-weight: 700;
  padding: 4px 12px; border-radius: 20px;
}
.ai-model { font-size: 12px; color: var(--text-muted); }
.ai-text {
  font-size: 15px; line-height: 1.8;
  color: var(--text-dim);
}

/* ── Chart ── */
.chart-wrapper {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  max-width: 700px;
}

/* ── Simulator ── */
.simulator-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px;
}
.sim-row {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 16px;
}
.sim-label {
  font-family: 'Syne', sans-serif;
  font-weight: 700; font-size: 16px;
}
.sim-value {
  font-family: 'Syne', sans-serif;
  font-size: 28px; font-weight: 800;
  color: var(--accent);
}
.sim-slider {
  -webkit-appearance: none;
  width: 100%; height: 8px;
  border-radius: 4px;
  background: rgba(255,255,255,0.1);
  outline: none; cursor: pointer;
  margin-bottom: 8px;
}
.sim-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 24px; height: 24px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 12px var(--accent);
  cursor: grab; transition: transform 0.1s;
}
.sim-slider::-webkit-slider-thumb:active { transform: scale(1.2); }
.sim-ticks {
  display: flex; justify-content: space-between;
  font-size: 11px; color: var(--text-muted);
  margin-bottom: 32px;
}
.sim-results {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 16px; margin-bottom: 24px;
}
.sim-metric-card {
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px;
  display: flex; flex-direction: column; gap: 6px;
}
.sim-metric-label {
  font-size: 12px; color: var(--text-muted);
}
.sim-metric-val {
  font-family: 'Syne', sans-serif;
  font-size: 28px; font-weight: 800;
}
.sim-status { font-size: 13px; font-weight: 600; }
.sim-verdict {
  text-align: center; font-family: 'Syne', sans-serif;
  font-size: 16px; font-weight: 700;
  padding: 14px; border-radius: var(--radius-sm);
  transition: all 0.3s;
}
.sim-verdict.biased { background: var(--red-dim); color: var(--red); }
.sim-verdict.fair { background: var(--green-dim); color: var(--green); }

/* ── Before / After ── */
.ba-wrapper {
  display: flex; align-items: stretch; gap: 24px;
}
.ba-card {
  flex: 1;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
}
.ba-before { border-color: rgba(239,68,68,0.3); }
.ba-after  { border-color: rgba(34,197,94,0.3); }
.ba-label {
  display: flex; align-items: center; gap: 8px;
  font-size: 12px; font-weight: 700; letter-spacing: 1px;
  text-transform: uppercase; color: var(--text-muted);
  margin-bottom: 20px;
}
.ba-dot { width: 8px; height: 8px; border-radius: 50%; }
.dot-red { background: var(--red); }
.dot-green { background: var(--green); }
.ba-metric {
  font-family: 'Syne', sans-serif;
  font-size: 28px; font-weight: 800; margin-bottom: 4px;
}
.ba-metric-sub {
  font-size: 13px; color: var(--text-muted); margin-bottom: 24px;
}
.ba-bar-wrap {
  display: flex; align-items: center; gap: 10px;
  margin-bottom: 12px;
  font-size: 13px; color: var(--text-dim);
}
.ba-bar {
  flex: 1; height: 10px;
  background: rgba(255,255,255,0.08); border-radius: 5px; overflow: hidden;
}
.ba-fill {
  height: 100%; border-radius: 5px;
  transition: width 1.2s cubic-bezier(0.4,0,0.2,1);
}
.ba-fill-green { background: var(--green); box-shadow: 0 0 8px var(--green-glow); }
.ba-fill-red   { background: var(--red);   box-shadow: 0 0 8px var(--red-glow); }
.ba-verdict {
  margin-top: 20px; text-align: center;
  font-family: 'Syne', sans-serif; font-size: 15px; font-weight: 700;
  padding: 10px; border-radius: var(--radius-sm);
}
.ba-verdict.biased { background: var(--red-dim); color: var(--red); }
.ba-verdict.fair   { background: var(--green-dim); color: var(--green); }
.ba-arrow {
  align-self: center; font-size: 36px;
  color: var(--text-muted); flex-shrink: 0;
}

/* ── Footer ── */
.footer {
  position: relative; z-index: 1;
  text-align: center; padding: 48px 24px;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
}
.footer-sub { font-size: 13px; margin-top: 6px; }

/* ── Utilities ── */
.hidden { display: none !important; }

.fade-in {
  animation: fadeInUp 0.5s ease forwards;
}
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .navbar { padding: 14px 20px; }
  .nav-links { gap: 16px; font-size: 13px; }
  .hero { padding: 64px 20px 48px; }
  .hero-stats { flex-direction: column; align-items: center; }
  .cards-grid { grid-template-columns: 1fr 1fr; }
  .sim-results { grid-template-columns: 1fr; }
  .ba-wrapper { flex-direction: column; }
  .ba-arrow { transform: rotate(90deg); text-align: center; }
  .section { padding: 60px 20px; }
}
@media (max-width: 480px) {
  .cards-grid { grid-template-columns: 1fr; }
  .hero-title { letter-spacing: -1px; }
}