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

:root {
  --bg: #0c0c0f;
  --surface-1: #111116;
  --surface-2: #1a1a20;
  --surface-3: #222228;
  --lime: #c8f530;
  --lime-dim: #9ab820;
  --text: #e8e8ec;
  --text-muted: #8888a0;
  --text-dim: #555568;
  --border: #222230;
  --font-head: 'Syne', sans-serif;
  --font-body: 'Instrument Sans', sans-serif;
  --radius: 12px;
  --radius-sm: 8px;
}

html { font-size: 16px; scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

/* === NAVBAR === */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 20px 48px;
  display: flex;
  align-items: center;
}

.navbar-inner {
  display: flex;
  align-items: center;
  gap: 20px;
}

.logo {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.dot { color: var(--lime); }

.nav-tagline {
  font-size: 0.75rem;
  color: var(--text-muted);
  padding: 4px 10px;
  border: 1px solid var(--border);
  border-radius: 100px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

/* === HERO === */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 120px 48px 80px;
  position: relative;
}

.hero-bg-grid {
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(200, 245, 48, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(200, 245, 48, 0.03) 1px, transparent 1px);
  background-size: 64px 64px;
  pointer-events: none;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 40%, black 40%, transparent 100%);
}

.hero-content {
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.hero-eyebrow {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--lime);
  margin-bottom: 24px;
}

.eyebrow-line {
  display: block;
  width: 32px;
  height: 2px;
  background: var(--lime);
  border-radius: 2px;
}

.hero-headline {
  font-family: var(--font-head);
  font-size: clamp(2.8rem, 5vw, 4.5rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.03em;
  color: var(--text);
  margin-bottom: 24px;
}

.hero-sub {
  font-size: 1.0625rem;
  color: var(--text-muted);
  line-height: 1.7;
  max-width: 440px;
  margin-bottom: 40px;
}

.hero-proof {
  display: flex;
  align-items: center;
  gap: 32px;
}

.proof-stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.stat-number {
  font-family: var(--font-head);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.02em;
}

.stat-label {
  font-size: 0.6875rem;
  color: var(--text-dim);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

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

/* === QUIZ CARD === */
.hero-right {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.quiz-card {
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  width: 100%;
  max-width: 400px;
  box-shadow: 0 0 0 1px rgba(200, 245, 48, 0.05), 0 32px 64px rgba(0,0,0,0.4);
}

.quiz-header {
  margin-bottom: 24px;
}

.quiz-step-label {
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--lime);
  font-family: var(--font-head);
  font-weight: 600;
  margin-bottom: 12px;
}

.quiz-progress {
  height: 3px;
  background: var(--surface-3);
  border-radius: 99px;
  overflow: hidden;
}

.quiz-progress-fill {
  height: 100%;
  background: var(--lime);
  border-radius: 99px;
  transition: width 0.4s ease;
}

.quiz-question {
  font-family: var(--font-head);
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 20px;
  line-height: 1.4;
}

.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 24px;
}

.quiz-option {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface-2);
  cursor: pointer;
  transition: all 0.2s ease;
}

.quiz-option:hover {
  border-color: var(--lime);
  background: rgba(200, 245, 48, 0.04);
}

.quiz-option:hover .option-letter {
  background: var(--lime);
  color: #000;
}

.option-letter {
  width: 28px;
  height: 28px;
  border-radius: 6px;
  background: var(--surface-3);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-head);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-muted);
  flex-shrink: 0;
  transition: all 0.2s ease;
}

.quiz-option span:last-child {
  font-size: 0.875rem;
  color: var(--text);
}

.quiz-footer {
  border-top: 1px solid var(--border);
  padding-top: 16px;
}

.quiz-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.quiz-nav-hint {
  font-size: 0.75rem;
  color: var(--text-dim);
}

.quiz-dots {
  display: flex;
  gap: 6px;
}

.dot-active {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--lime);
}

.dot-inactive {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--surface-3);
}

.quiz-decoration {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.deco-ring {
  position: absolute;
  border-radius: 50%;
  border: 1px solid rgba(200, 245, 48, 0.1);
}

.deco-ring-1 {
  width: 300px; height: 300px;
  right: -80px; top: 50%;
  transform: translateY(-50%);
}

.deco-ring-2 {
  width: 480px; height: 480px;
  right: -140px; top: 50%;
  transform: translateY(-50%);
}

.deco-lime-dot {
  position: absolute;
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--lime);
  bottom: -20px; right: 60px;
  box-shadow: 0 0 16px var(--lime);
}

.hero-scroll-hint {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-dim);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-top: 64px;
  justify-content: center;
}

/* === WHY SECTION === */
.why {
  padding: 120px 48px;
  background: var(--surface-1);
  border-top: 1px solid var(--border);
}

.section-header {
  max-width: 1200px;
  margin: 0 auto 64px;
}

.section-label {
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--lime);
  font-family: var(--font-head);
  font-weight: 600;
  margin-bottom: 16px;
}

.section-title {
  font-family: var(--font-head);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.025em;
  color: var(--text);
}

.why-grid {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.why-card {
  background: var(--surface-1);
  padding: 40px 36px;
}

.why-icon {
  width: 44px; height: 44px;
  border-radius: 10px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.why-icon--lime {
  background: rgba(200, 245, 48, 0.08);
  border-color: rgba(200, 245, 48, 0.2);
  color: var(--lime);
}

.why-card h3 {
  font-family: var(--font-head);
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 12px;
}

.why-card p {
  font-size: 0.9375rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* === MODELS SECTION === */
.models {
  padding: 120px 48px;
}

.models-grid {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 12px;
  margin-bottom: 40px;
}

.model-card {
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 22px;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.model-card:hover {
  border-color: rgba(200, 245, 48, 0.3);
  transform: translateY(-2px);
}

.model-header {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 20px;
}

.model-badge {
  font-family: var(--font-head);
  font-size: 0.625rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--lime);
  background: rgba(200, 245, 48, 0.08);
  border: 1px solid rgba(200, 245, 48, 0.15);
  padding: 4px 8px;
  border-radius: 4px;
  display: inline-block;
  width: fit-content;
}

.model-cost {
  font-size: 0.6875rem;
  color: var(--text-dim);
}

.model-name {
  font-family: var(--font-head);
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
}

.model-desc {
  font-size: 0.8125rem;
  color: var(--text-muted);
  line-height: 1.55;
  margin-bottom: 20px;
}

.model-math {
  border-top: 1px solid var(--border);
  padding-top: 16px;
}

.math-label {
  display: block;
  font-size: 0.625rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-dim);
  margin-bottom: 4px;
}

.math-formula {
  font-family: var(--font-head);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text);
}

.models-note {
  max-width: 600px;
  margin: 0 auto;
  text-align: center;
  font-size: 0.875rem;
  color: var(--text-dim);
  font-style: italic;
}

/* === FIT SECTION === */
.fit {
  padding: 120px 48px;
  background: var(--surface-1);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.fit-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 80px;
  align-items: center;
}

.fit-score-ring {
  position: relative;
  width: 160px;
  height: 160px;
}

.ring-svg {
  width: 100%;
  height: 100%;
}

.ring-center {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.ring-pct {
  font-family: var(--font-head);
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--lime);
  letter-spacing: -0.03em;
}

.ring-label {
  font-size: 0.6875rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.fit-title {
  font-family: var(--font-head);
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.025em;
  color: var(--text);
  margin-bottom: 16px;
}

.fit-sub {
  font-size: 1rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 32px;
  max-width: 480px;
}

.fit-breakdown {
  display: flex;
  flex-direction: column;
  gap: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 24px;
}

.breakdown-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 20px;
  border-bottom: 1px solid var(--border);
}

.breakdown-row:last-child { border-bottom: none; }

.breakdown-key {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.breakdown-val {
  font-family: var(--font-head);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text);
}

.fit-second {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
}

.second-label { color: var(--text-dim); }

.second-value { color: var(--text); font-weight: 500; }

.second-score { color: var(--text-muted); }

/* === CLOSING === */
.closing {
  padding: 160px 48px;
  text-align: center;
}

.closing-inner {
  max-width: 680px;
  margin: 0 auto;
}

.closing-title {
  font-family: var(--font-head);
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text);
  margin-bottom: 24px;
  line-height: 1.1;
}

.closing-body {
  font-size: 1.0625rem;
  color: var(--text-muted);
  line-height: 1.75;
  margin-bottom: 48px;
}

.closing-cta {
  display: inline-block;
}

.cta-text {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.cta-headline {
  font-family: var(--font-head);
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--lime);
  letter-spacing: -0.02em;
}

.cta-sub {
  font-size: 0.875rem;
  color: var(--text-dim);
}

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

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

.footer-logo {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.125rem;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.footer-tagline {
  font-size: 0.8125rem;
  color: var(--text-dim);
  margin-top: 4px;
}

.footer-copy {
  font-size: 0.8125rem;
  color: var(--text-dim);
  text-align: right;
}

/* === RESPONSIVE === */
@media (max-width: 1024px) {
  .models-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .hero-content {
    gap: 48px;
  }
}

@media (max-width: 768px) {
  .navbar { padding: 16px 24px; }
  .hero { padding: 100px 24px 64px; }
  .hero-content {
    grid-template-columns: 1fr;
    gap: 48px;
  }
  .hero-left { order: 2; }
  .hero-right { order: 1; }
  .hero-headline { font-size: 2.5rem; }
  .quiz-card { max-width: 100%; }
  .why-grid { grid-template-columns: 1fr; }
  .models-grid { grid-template-columns: 1fr 1fr; }
  .fit-inner { grid-template-columns: 1fr; gap: 48px; }
  .fit-score-ring { margin: 0 auto; }
  .why, .models, .fit, .closing { padding: 80px 24px; }
  .footer-inner { flex-direction: column; gap: 16px; text-align: center; }
  .footer-copy { text-align: center; }
}

@media (max-width: 480px) {
  .models-grid { grid-template-columns: 1fr; }
  .hero-proof { gap: 20px; }
}