/* ============================================
   SkillStack — Global Styles
   ============================================ */

:root {
  --bg: #06060A;
  --surface: #0F0F14;
  --surface-2: #16161D;
  --lime: #C9F439;
  --lime-dim: rgba(201, 244, 57, 0.12);
  --lime-glow: rgba(201, 244, 57, 0.06);
  --cream: #F0EBE0;
  --muted: rgba(240, 235, 224, 0.55);
  --border: rgba(201, 244, 57, 0.14);
  --border-dim: rgba(201, 244, 57, 0.07);
  --white: #FFFFFF;
  --text-primary: #F0EBE0;
  --text-secondary: rgba(240, 235, 224, 0.65);
  --font-display: 'Syne', sans-serif;
  --font-body: 'DM Sans', sans-serif;
}

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

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

body {
  background: var(--bg);
  color: var(--text-primary);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* ---- Navigation ---- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 48px;
  border-bottom: 1px solid var(--border-dim);
  background: rgba(6, 6, 10, 0.85);
  backdrop-filter: blur(16px);
}

.brand-mark {
  display: flex;
  align-items: center;
  gap: 10px;
}

.mark-stack {
  display: flex;
  align-items: flex-end;
  gap: 3px;
  height: 18px;
}

.mark-bar {
  display: block;
  width: 5px;
  border-radius: 1px;
  background: var(--lime);
}

.bar-1 { height: 6px; }
.bar-2 { height: 12px; }
.bar-3 { height: 18px; }

.brand-name {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--cream);
}

.nav-tagline {
  font-size: 12px;
  color: var(--muted);
  font-weight: 400;
  letter-spacing: 0.02em;
}

.nav-cta {
  font-size: 13px;
  font-weight: 600;
  color: var(--bg);
  background: var(--lime);
  padding: 8px 18px;
  border-radius: 3px;
  text-decoration: none;
  transition: opacity 0.15s;
}

.nav-cta:hover {
  opacity: 0.8;
}

/* ---- Hero ---- */
.hero {
  position: relative;
  padding: 96px 48px 80px;
  overflow: hidden;
}

.hero-glow {
  position: absolute;
  top: -120px;
  right: -80px;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(201, 244, 57, 0.07) 0%, transparent 65%);
  pointer-events: none;
}

.hero-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 400px;
  gap: 80px;
  align-items: start;
}

.eyebrow {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--lime);
  border: 1px solid var(--border);
  padding: 5px 12px;
  border-radius: 2px;
  margin-bottom: 28px;
}

.hero-headline {
  font-family: var(--font-display);
  font-size: clamp(40px, 5vw, 68px);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.03em;
  color: var(--cream);
  margin-bottom: 28px;
}

.hero-lede {
  font-size: 17px;
  line-height: 1.65;
  color: var(--text-secondary);
  max-width: 560px;
  margin-bottom: 16px;
}

.hero-lede--second {
  margin-bottom: 0;
}

/* ---- Hero Stats ---- */
.hero-stats {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.stat-card {
  background: var(--surface);
  border: 1px solid var(--border-dim);
  padding: 20px 24px;
  border-radius: 3px;
}

.stat-card--main {
  border-color: var(--border);
  background: var(--surface-2);
}

.stat-label {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 6px;
}

.stat-value {
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--cream);
  line-height: 1;
  margin-bottom: 4px;
}

.stat-value--accent {
  color: var(--lime);
}

.stat-sub {
  font-size: 12px;
  color: var(--muted);
}

.stat-bar {
  margin-top: 12px;
  height: 2px;
  background: var(--border-dim);
  border-radius: 1px;
  overflow: hidden;
}

.stat-bar-fill {
  height: 100%;
  width: 62%;
  background: var(--lime);
  border-radius: 1px;
}

/* ---- Proof ---- */
.proof {
  padding: 96px 48px;
  border-top: 1px solid var(--border-dim);
}

.proof-inner {
  max-width: 1280px;
  margin: 0 auto;
}

.proof-headline {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 40px;
}

.proof-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--border-dim);
  border: 1px solid var(--border-dim);
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 40px;
}

.proof-item {
  background: var(--surface);
  padding: 28px 24px;
}

.proof-platform-label {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  color: var(--cream);
  margin-bottom: 10px;
  letter-spacing: -0.01em;
}

.proof-platform-desc {
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-secondary);
}

.proof-gap {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 24px 28px;
  border: 1px solid var(--border);
  background: var(--lime-dim);
  border-radius: 3px;
}

.gap-label {
  font-size: 15px;
  color: var(--text-secondary);
  font-weight: 400;
}

.gap-accent {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  color: var(--lime);
  white-space: nowrap;
}

/* ---- How ---- */
.how {
  padding: 96px 48px;
  border-top: 1px solid var(--border-dim);
}

.how-inner {
  max-width: 1280px;
  margin: 0 auto;
}

.how-header {
  margin-bottom: 64px;
}

.section-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--lime);
  margin-bottom: 16px;
}

.how-headline {
  font-family: var(--font-display);
  font-size: clamp(28px, 3.5vw, 48px);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--cream);
  line-height: 1.1;
  max-width: 480px;
}

.how-steps {
  display: grid;
  grid-template-columns: 1fr 64px 1fr 64px 1fr;
  align-items: start;
  gap: 0;
}

.step {
  background: var(--surface);
  border: 1px solid var(--border-dim);
  padding: 32px 28px;
  border-radius: 3px;
}

.step-connector {
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding-top: 32px;
}

.step-connector::after {
  content: '';
  display: block;
  width: 40px;
  height: 1px;
  background: var(--border);
  position: relative;
  top: -48px;
}

.step-num {
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--lime);
  margin-bottom: 16px;
}

.step-title {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--cream);
  margin-bottom: 10px;
  letter-spacing: -0.01em;
}

.step-desc {
  font-size: 14px;
  line-height: 1.65;
  color: var(--text-secondary);
}

/* ---- Spectrum ---- */
.spectrum {
  padding: 96px 48px;
  border-top: 1px solid var(--border-dim);
}

.spectrum-inner {
  max-width: 1280px;
  margin: 0 auto;
}

.spectrum-header {
  margin-bottom: 48px;
}

.spectrum-headline {
  font-family: var(--font-display);
  font-size: clamp(28px, 3.5vw, 48px);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--cream);
  line-height: 1.1;
}

.spectrum-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.spectrum-card {
  background: var(--surface);
  border: 1px solid var(--border-dim);
  padding: 32px 28px;
  border-radius: 3px;
  position: relative;
}

.spectrum-card--featured {
  border-color: var(--border);
  background: var(--surface-2);
}

.spectrum-badge {
  display: inline-block;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--bg);
  background: var(--lime);
  padding: 3px 10px;
  border-radius: 2px;
  margin-bottom: 20px;
}

.spectrum-role {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--cream);
  margin-bottom: 8px;
  letter-spacing: -0.02em;
}

.spectrum-pay {
  font-size: 14px;
  color: var(--lime);
  font-weight: 500;
  margin-bottom: 16px;
}

.spectrum-desc {
  font-size: 14px;
  line-height: 1.65;
  color: var(--text-secondary);
}

/* ---- Closing ---- */
.closing {
  padding: 120px 48px;
  border-top: 1px solid var(--border-dim);
  overflow: hidden;
  position: relative;
}

.closing-glow {
  position: absolute;
  bottom: -100px;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 400px;
  background: radial-gradient(ellipse, rgba(201, 244, 57, 0.08) 0%, transparent 60%);
  pointer-events: none;
}

.closing-inner {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

.closing-headline {
  font-family: var(--font-display);
  font-size: clamp(32px, 4vw, 56px);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--cream);
  line-height: 1.1;
  margin-bottom: 20px;
}

.closing-sub {
  font-size: 18px;
  color: var(--text-secondary);
  margin-bottom: 40px;
  line-height: 1.6;
}

.closing-tagline {
  font-family: var(--font-display);
  font-size: clamp(20px, 2.5vw, 28px);
  font-weight: 700;
  color: var(--lime);
  letter-spacing: -0.02em;
  line-height: 1.35;
}

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

.footer-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  text-align: center;
}

.footer-brand {
  margin-bottom: 4px;
}

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

.footer-meta {
  font-size: 12px;
  color: var(--muted);
}

/* ---- Responsive ---- */
@media (max-width: 900px) {
  .nav { padding: 16px 24px; }
  .hero { padding: 64px 24px 56px; }
  .hero-inner {
    grid-template-columns: 1fr;
    gap: 48px;
  }
  .hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
  }
  .stat-card { padding: 16px; }
  .stat-value { font-size: 24px; }
  .proof { padding: 64px 24px; }
  .proof-grid {
    grid-template-columns: 1fr 1fr;
  }
  .proof-gap {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
  .how { padding: 64px 24px; }
  .how-steps {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .step-connector { display: none; }
  .spectrum { padding: 64px 24px; }
  .spectrum-grid {
    grid-template-columns: 1fr;
  }
  .closing { padding: 80px 24px; }
  .footer { padding: 32px 24px; }
}

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