:root {
  --bg: #0a0a0f;
  --bg-elevated: #12121a;
  --bg-card: #1a1a26;
  --fg: #e8e8ed;
  --fg-muted: #8888a0;
  --fg-dim: #55556a;
  --accent: #6366f1;
  --accent-glow: rgba(99, 102, 241, 0.15);
  --accent-bright: #818cf8;
  --orange: #f59e0b;
  --green: #22c55e;
  --radius: 12px;
  --radius-sm: 8px;
  --font-display: 'Space Grotesk', system-ui, sans-serif;
  --font-body: 'DM Sans', system-ui, sans-serif;
}

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

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;
}

/* ===== HERO ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 80px 24px 60px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -40%;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  pointer-events: none;
}

.hero-inner {
  max-width: 900px;
  text-align: center;
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 2px;
  color: var(--accent-bright);
  background: var(--accent-glow);
  padding: 6px 16px;
  border-radius: 20px;
  margin-bottom: 32px;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.8rem, 7vw, 5rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
}

.highlight {
  background: linear-gradient(135deg, var(--accent-bright), var(--orange));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.lede {
  font-size: clamp(1.05rem, 2.2vw, 1.25rem);
  color: var(--fg-muted);
  max-width: 620px;
  margin: 0 auto 48px;
  line-height: 1.7;
}

/* Briefing card mock */
.hero-visual {
  display: flex;
  justify-content: center;
}

.briefing-card {
  background: var(--bg-card);
  border: 1px solid rgba(99, 102, 241, 0.2);
  border-radius: var(--radius);
  width: 100%;
  max-width: 520px;
  text-align: left;
  overflow: hidden;
  box-shadow: 0 8px 40px rgba(0,0,0,0.4), 0 0 80px var(--accent-glow);
}

.briefing-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 14px 20px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  font-size: 13px;
}

.briefing-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 6px var(--green);
}

.briefing-label {
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--fg);
}

.briefing-date {
  margin-left: auto;
  color: var(--fg-dim);
}

.briefing-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 16px 20px;
  border-bottom: 1px solid rgba(255,255,255,0.04);
  transition: background 0.2s;
}

.briefing-item:last-child { border-bottom: none; }

.briefing-rank {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  color: var(--accent-bright);
  min-width: 28px;
  padding-top: 2px;
}

.briefing-title {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 15px;
  line-height: 1.4;
  margin-bottom: 4px;
}

.briefing-meta {
  font-size: 12px;
  color: var(--fg-dim);
}

/* ===== PROBLEM ===== */
.problem {
  padding: 100px 24px;
  background: var(--bg-elevated);
}

.problem-inner {
  max-width: 1000px;
  margin: 0 auto;
}

.problem-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
  margin-bottom: 48px;
}

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

.stat-number {
  font-family: var(--font-display);
  font-size: clamp(3rem, 6vw, 4.5rem);
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent-bright), var(--orange));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.1;
  margin-bottom: 12px;
}

.stat-desc {
  font-size: 15px;
  color: var(--fg-muted);
  line-height: 1.5;
  max-width: 260px;
  margin: 0 auto 8px;
}

.stat-source {
  font-size: 11px;
  color: var(--fg-dim);
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.problem-statement {
  text-align: center;
  font-family: var(--font-display);
  font-size: clamp(1.1rem, 2.5vw, 1.4rem);
  font-weight: 500;
  color: var(--fg);
  max-width: 700px;
  margin: 0 auto;
  line-height: 1.6;
}

/* ===== HOW IT WORKS ===== */
.how {
  padding: 100px 24px;
}

.how-inner {
  max-width: 800px;
  margin: 0 auto;
}

.how h2 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 700;
  text-align: center;
  margin-bottom: 64px;
  letter-spacing: -0.01em;
}

.how-steps {
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.how-step {
  display: flex;
  gap: 24px;
  align-items: flex-start;
}

.step-number {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--accent-glow);
  color: var(--accent-bright);
  border: 1px solid rgba(99, 102, 241, 0.3);
  flex-shrink: 0;
}

.step-content h3 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 6px;
}

.step-content p {
  color: var(--fg-muted);
  font-size: 15px;
  line-height: 1.65;
}

/* ===== FEATURES ===== */
.features {
  padding: 100px 24px;
  background: var(--bg-elevated);
}

.features-inner {
  max-width: 1000px;
  margin: 0 auto;
}

.features h2 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 700;
  text-align: center;
  margin-bottom: 56px;
  letter-spacing: -0.01em;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius);
  padding: 32px;
  transition: border-color 0.3s, box-shadow 0.3s;
}

.feature-card:hover {
  border-color: rgba(99, 102, 241, 0.3);
  box-shadow: 0 4px 24px var(--accent-glow);
}

.feature-icon {
  font-size: 24px;
  color: var(--accent-bright);
  margin-bottom: 16px;
}

.feature-card h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.feature-card p {
  font-size: 14px;
  color: var(--fg-muted);
  line-height: 1.65;
}

/* ===== CLOSING ===== */
.closing {
  padding: 120px 24px;
  text-align: center;
  position: relative;
}

.closing::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  pointer-events: none;
}

.closing-inner {
  position: relative;
  z-index: 1;
  max-width: 700px;
  margin: 0 auto;
}

.closing h2 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 20px;
  letter-spacing: -0.01em;
}

.closing-text {
  font-size: 1.1rem;
  color: var(--fg-muted);
  line-height: 1.7;
}

/* ===== FOOTER ===== */
.site-footer {
  padding: 40px 24px;
  border-top: 1px solid rgba(255,255,255,0.06);
  text-align: center;
}

.footer-brand {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  margin-bottom: 4px;
}

.footer-tagline {
  font-size: 13px;
  color: var(--fg-dim);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .problem-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .feature-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    padding: 60px 20px 40px;
    min-height: auto;
  }

  .how-step {
    gap: 16px;
  }

  .briefing-card {
    max-width: 100%;
  }

  .problem, .how, .features, .closing {
    padding: 60px 20px;
  }
}