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

:root {
  --bg: #0c0c0e;
  --fg: #e8e8e4;
  --muted: #666;
  --border: #1e1e22;
  --accent: #00ff88;
  --accent-dim: rgba(0, 255, 136, 0.08);
  --surface: #111114;
  --surface2: #18181c;
  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'DM Sans', sans-serif;
  --radius: 12px;
}

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

::selection { background: var(--accent); color: #000; }

/* === NAVBAR === */
.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 48px;
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(12, 12, 14, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 18px;
  letter-spacing: -0.02em;
  color: var(--fg);
  text-decoration: none;
}

.nav-links {
  display: flex;
  gap: 32px;
}

.nav-links a {
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: color 0.2s;
}

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

/* === HERO === */
.hero {
  padding: 80px 48px 64px;
  border-bottom: 1px solid var(--border);
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
}

.hero-eyebrow {
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 20px;
}

.hero-headline {
  font-family: var(--font-display);
  font-size: clamp(42px, 5vw, 68px);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.03em;
  color: var(--fg);
  margin-bottom: 24px;
}

.hero-sub {
  font-size: 17px;
  color: #999;
  line-height: 1.65;
  max-width: 420px;
  font-weight: 300;
}

/* === SCAN WIDGET === */
.scan-widget {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.scan-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 500;
  color: var(--muted);
  letter-spacing: 0.05em;
}

.scan-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.scan-body {
  padding: 28px;
}

.scan-placeholder {
  border: 1.5px dashed var(--border);
  border-radius: 8px;
  padding: 36px 24px;
  text-align: center;
  margin-bottom: 20px;
}

.scan-placeholder svg { margin-bottom: 12px; }
.scan-placeholder p { font-size: 14px; color: var(--muted); font-weight: 400; }

.scan-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  background: var(--accent-dim);
  border: 1px solid rgba(0, 255, 136, 0.2);
  color: var(--accent);
  font-size: 11px;
  font-family: var(--font-display);
  font-weight: 500;
  padding: 4px 10px;
  border-radius: 20px;
}

/* === HERO STATS === */
.hero-stats {
  display: flex;
  align-items: center;
  gap: 0;
  max-width: 1200px;
  margin: 48px auto 0;
  padding-top: 48px;
  border-top: 1px solid var(--border);
}

.stat { padding: 0 40px; }
.stat:first-child { padding-left: 0; }

.stat-number {
  display: block;
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 700;
  color: var(--fg);
  letter-spacing: -0.03em;
  line-height: 1;
  margin-bottom: 6px;
}

.stat-label {
  font-size: 13px;
  color: var(--muted);
}

.stat-divider {
  width: 1px;
  height: 40px;
  background: var(--border);
}

/* === SECTION LABELS === */
.section-label {
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 16px;
}

/* === CHALLENGE === */
.challenge {
  padding: 96px 48px;
  border-bottom: 1px solid var(--border);
}

.challenge-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: start;
}

.challenge-headline {
  font-family: var(--font-display);
  font-size: clamp(32px, 4vw, 52px);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.03em;
  color: var(--fg);
  margin-bottom: 20px;
}

.challenge-body {
  font-size: 16px;
  color: #888;
  line-height: 1.7;
  font-weight: 300;
}

.quiz-preview {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.quiz-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
}

.quiz-label {
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 20px;
}

.quiz-images {
  display: flex;
  align-items: center;
  gap: 24px;
  margin-bottom: 20px;
}

.quiz-option {
  flex: 1;
  text-align: center;
}

.quiz-option span {
  display: block;
  font-size: 11px;
  color: var(--muted);
  margin-top: 8px;
  font-family: var(--font-display);
}

.quiz-box {
  width: 100%;
  aspect-ratio: 1;
  max-width: 120px;
  margin: 0 auto;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
}

.quiz-a { background: #1a1a22; border: 1.5px solid #2a2a35; color: #555; }
.quiz-b { background: #1a1a22; border: 1.5px solid #2a2a35; color: #555; }

.quiz-vs {
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 600;
  color: #444;
  letter-spacing: 0.1em;
  flex-shrink: 0;
}

.quiz-hint {
  text-align: center;
  font-size: 12px;
  color: var(--muted);
  font-style: italic;
}

.challenge-cta {
  background: var(--accent-dim);
  border: 1px solid rgba(0, 255, 136, 0.15);
  border-radius: 8px;
  padding: 16px 20px;
}

.challenge-cta p {
  font-size: 14px;
  color: #888;
  text-align: center;
}

/* === HOW IT WORKS === */
.how {
  padding: 96px 48px;
  border-bottom: 1px solid var(--border);
}

.how-inner {
  max-width: 1200px;
  margin: 0 auto;
}

.how-steps {
  display: flex;
  align-items: flex-start;
  gap: 0;
  margin-top: 48px;
}

.step {
  flex: 1;
  padding: 32px 36px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-right: 24px;
}

.step-num {
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.08em;
  margin-bottom: 16px;
}

.step h3 {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 600;
  color: var(--fg);
  margin-bottom: 10px;
  letter-spacing: -0.01em;
}

.step p {
  font-size: 14px;
  color: #777;
  line-height: 1.6;
}

.step-arrow {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  margin-right: 24px;
  margin-top: 42px;
}

/* === MODELS === */
.models {
  padding: 96px 48px;
  border-bottom: 1px solid var(--border);
}

.models-inner {
  max-width: 1200px;
  margin: 0 auto;
}

.models-headline {
  font-family: var(--font-display);
  font-size: clamp(32px, 4vw, 52px);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.03em;
  color: var(--fg);
  margin-bottom: 48px;
}

.models-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.model-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 20px 24px;
  background: var(--surface);
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 500;
  color: #888;
  transition: background 0.2s, color 0.2s;
}

.model-item:hover { background: var(--surface2); color: var(--fg); }

.model-icon { flex-shrink: 0; }

/* === CLOSING === */
.closing {
  padding: 96px 48px;
}

.closing-inner {
  max-width: 1200px;
  margin: 0 auto;
}

.closing-visual {
  max-width: 600px;
}

.closing-stat {
  margin-bottom: 40px;
}

.closing-num {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(80px, 12vw, 140px);
  font-weight: 700;
  color: var(--accent);
  line-height: 0.85;
  letter-spacing: -0.05em;
  margin-bottom: 16px;
}

.closing-sub {
  font-size: 16px;
  color: var(--muted);
  font-weight: 300;
}

.closing-divider {
  width: 60px;
  height: 1px;
  background: var(--border);
  margin-bottom: 40px;
}

.closing-text {
  font-size: 20px;
  color: #aaa;
  line-height: 1.65;
  font-weight: 300;
  margin-bottom: 16px;
}

/* === FOOTER === */
.site-footer {
  padding: 48px;
  border-top: 1px solid var(--border);
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 16px;
  color: var(--fg);
}

.footer-tagline {
  font-size: 14px;
  color: var(--muted);
}

.footer-copy {
  font-size: 12px;
  color: #444;
  margin-top: 8px;
}

/* === RESPONSIVE === */
@media (max-width: 900px) {
  .navbar { padding: 18px 24px; }
  .hero { padding: 56px 24px 48px; }
  .hero-content { grid-template-columns: 1fr; gap: 40px; }
  .hero-stats { flex-direction: column; align-items: start; gap: 20px; }
  .stat { padding: 0; }
  .stat-divider { display: none; }
  .challenge { padding: 64px 24px; }
  .challenge-inner { grid-template-columns: 1fr; gap: 40px; }
  .how { padding: 64px 24px; }
  .how-steps { flex-direction: column; }
  .step { margin-right: 0; margin-bottom: 16px; }
  .step-arrow { transform: rotate(90deg); margin: 0 auto 8px; }
  .models { padding: 64px 24px; }
  .models-grid { grid-template-columns: repeat(2, 1fr); }
  .closing { padding: 64px 24px; }
  .closing-text { font-size: 17px; }
  .site-footer { padding: 32px 24px; }
  .nav-links { gap: 20px; }
}

@media (max-width: 600px) {
  .models-grid { grid-template-columns: 1fr; }
  .nav-links { display: none; }
}

/* === SIGNUP PAGE === */
.signup-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px 24px;
}

.signup-container {
  width: 100%;
  max-width: 480px;
}

.signup-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 48px 40px;
}

.signup-logo {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 28px;
  letter-spacing: -0.02em;
}

.signup-card h1 {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 700;
  color: var(--fg);
  letter-spacing: -0.03em;
  margin-bottom: 10px;
}

.signup-sub {
  font-size: 15px;
  color: var(--muted);
  margin-bottom: 32px;
  line-height: 1.5;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--muted);
  margin-bottom: 8px;
  font-family: var(--font-display);
}

.form-group input {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--fg);
  font-size: 15px;
  font-family: var(--font-body);
  transition: border-color 0.2s;
  outline: none;
}

.form-group input:focus { border-color: var(--accent); }
.form-group input::placeholder { color: #444; }

.btn-primary {
  display: inline-block;
  width: 100%;
  padding: 14px 24px;
  background: var(--accent);
  color: #000;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 600;
  border-radius: 8px;
  text-decoration: none;
  border: none;
  cursor: pointer;
  letter-spacing: -0.01em;
  transition: opacity 0.2s;
  text-align: center;
}

.btn-primary:hover { opacity: 0.85; }

.form-error {
  background: rgba(255, 50, 50, 0.1);
  border: 1px solid rgba(255, 50, 50, 0.3);
  color: #ff6363;
  padding: 12px 16px;
  border-radius: 8px;
  font-size: 14px;
  margin-bottom: 20px;
}

.signup-footnote {
  text-align: center;
  font-size: 13px;
  color: var(--muted);
  margin-top: 16px;
}

/* === SUCCESS PAGE === */
.success-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px 24px;
}

.success-container { width: 100%; max-width: 480px; }

.success-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 56px 40px;
  text-align: center;
}

.success-icon {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--accent-dim);
  border: 1px solid rgba(0, 255, 136, 0.3);
  color: var(--accent);
  font-size: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 28px;
}

.success-card h1 {
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 700;
  color: var(--fg);
  letter-spacing: -0.03em;
  margin-bottom: 12px;
}

.success-card p {
  font-size: 16px;
  color: var(--muted);
  margin-bottom: 32px;
}