:root {
  --bg: #0a0b0e;
  --bg-elevated: #12131a;
  --bg-card: #16171f;
  --fg: #e8e9ed;
  --fg-muted: #8b8d97;
  --fg-dim: #5a5c66;
  --accent: #4ae3b5;
  --accent-glow: rgba(74, 227, 181, 0.15);
  --accent-dim: #2a9e78;
  --border: rgba(255, 255, 255, 0.06);
  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'DM Sans', sans-serif;
}

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

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.15;
}

/* ---- HERO ---- */
.hero {
  position: relative;
  min-height: 85vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 100px 24px 80px;
  overflow: hidden;
}

.hero-inner {
  position: relative;
  z-index: 2;
  max-width: 720px;
}

.hero-badge {
  display: inline-block;
  padding: 6px 16px;
  border: 1px solid var(--accent-dim);
  border-radius: 100px;
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 500;
  color: var(--accent);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 32px;
}

.hero h1 {
  font-size: clamp(40px, 7vw, 72px);
  letter-spacing: -0.03em;
  margin-bottom: 24px;
  background: linear-gradient(135deg, var(--fg) 40%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-sub {
  font-size: 18px;
  color: var(--fg-muted);
  max-width: 540px;
  margin: 0 auto;
  line-height: 1.7;
}

.hero-glow {
  position: absolute;
  top: -20%;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
  z-index: 1;
}

/* ---- PROBLEM ---- */
.problem {
  padding: 120px 24px;
  background: var(--bg-elevated);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.problem-inner {
  max-width: 960px;
  margin: 0 auto;
}

.problem-label,
.features-label,
.how-label {
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 500;
  color: var(--accent);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.problem h2 {
  font-size: clamp(28px, 4vw, 42px);
  letter-spacing: -0.02em;
  margin-bottom: 56px;
  color: var(--fg);
}

.problem-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.problem-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px 28px;
}

.problem-num {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  color: var(--accent-dim);
  margin-bottom: 16px;
}

.problem-card p {
  font-size: 16px;
  color: var(--fg-muted);
  line-height: 1.6;
}

/* ---- FEATURES ---- */
.features {
  padding: 120px 24px;
}

.features-inner {
  max-width: 960px;
  margin: 0 auto;
}

.features h2 {
  font-size: clamp(28px, 4vw, 42px);
  letter-spacing: -0.02em;
  margin-bottom: 56px;
}

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

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 36px 32px;
  transition: border-color 0.2s;
}

.feature-card:hover {
  border-color: rgba(74, 227, 181, 0.2);
}

.feature-accent {
  border-color: rgba(74, 227, 181, 0.15);
  background: linear-gradient(135deg, var(--bg-card) 60%, rgba(74, 227, 181, 0.04) 100%);
}

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

.feature-card h3 {
  font-size: 20px;
  margin-bottom: 10px;
  color: var(--fg);
}

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

/* ---- HOW ---- */
.how {
  padding: 120px 24px;
  background: var(--bg-elevated);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.how-inner {
  max-width: 640px;
  margin: 0 auto;
}

.how h2 {
  font-size: clamp(28px, 4vw, 42px);
  letter-spacing: -0.02em;
  margin-bottom: 56px;
}

.how-steps {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.how-step {
  position: relative;
  padding-left: 48px;
  padding-bottom: 48px;
}

.how-step:last-child {
  padding-bottom: 0;
}

.step-dot {
  position: absolute;
  left: 0;
  top: 6px;
  width: 16px;
  height: 16px;
  background: var(--accent);
  border-radius: 50%;
  box-shadow: 0 0 12px var(--accent-glow);
}

.step-line {
  position: absolute;
  left: 7px;
  top: 22px;
  width: 2px;
  height: calc(100% - 6px);
  background: linear-gradient(180deg, var(--accent-dim) 0%, transparent 100%);
}

.how-step:last-child .step-line {
  display: none;
}

.step-content h3 {
  font-size: 22px;
  margin-bottom: 8px;
  color: var(--fg);
}

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

/* ---- CLOSING ---- */
.closing {
  padding: 140px 24px;
  text-align: center;
}

.closing-inner {
  max-width: 660px;
  margin: 0 auto;
}

.closing h2 {
  font-size: clamp(30px, 5vw, 48px);
  letter-spacing: -0.02em;
  margin-bottom: 20px;
  background: linear-gradient(135deg, var(--fg) 30%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.closing-sub {
  font-size: 17px;
  color: var(--fg-muted);
  line-height: 1.7;
}

/* ---- FOOTER ---- */
.site-footer {
  padding: 48px 24px;
  border-top: 1px solid var(--border);
  text-align: center;
}

.footer-inner {
  max-width: 960px;
  margin: 0 auto;
}

.footer-brand {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  color: var(--fg);
  margin-bottom: 8px;
}

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

/* ---- RESPONSIVE ---- */
@media (max-width: 768px) {
  .problem-grid {
    grid-template-columns: 1fr;
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .hero {
    min-height: 70vh;
    padding: 80px 20px 60px;
  }
  .problem, .features, .how, .closing {
    padding: 80px 20px;
  }
}

@media (max-width: 480px) {
  body {
    font-size: 15px;
  }
  .hero h1 {
    font-size: 34px;
  }
  .problem h2, .features h2, .how h2, .closing h2 {
    font-size: 26px;
  }
  .feature-card {
    padding: 28px 24px;
  }
}