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

:root {
  --color-bg: #ffffff;
  --color-bg-alt: #f8fafc;
  --color-text: #0f172a;
  --color-text-secondary: #475569;
  --color-text-muted: #94a3b8;
  --color-accent: #1e293b;
  --color-border: #e2e8f0;
  --color-border-light: #f1f5f9;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --max-width: 1120px;
  --spacing-section: 120px;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
}

a {
  color: inherit;
  text-decoration: none;
}

/* === Layout === */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 32px;
}

/* === Nav === */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border-light);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 11px;
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: -0.015em;
}

.logo-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  background: var(--color-text);
  color: #fff;
  border-radius: 7px;
  font-size: 0.82rem;
  font-weight: 700;
}

.nav-contact {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color 0.15s;
}

.nav-contact:hover {
  color: var(--color-text);
}

/* === Hero === */
.hero {
  padding: 192px 0 160px;
}

.hero h1 {
  font-size: clamp(2.5rem, 5.5vw, 3.75rem);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.04em;
  max-width: 780px;
  color: var(--color-text);
}

.hero-sub {
  margin-top: 28px;
  font-size: 1.2rem;
  line-height: 1.7;
  color: var(--color-text-secondary);
  max-width: 560px;
}

.hero-actions {
  margin-top: 48px;
  display: flex;
  align-items: center;
  gap: 28px;
  flex-wrap: wrap;
}

.hero-email {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  transition: color 0.2s;
}

.hero-email:hover {
  color: var(--color-text-secondary);
}

/* === Buttons === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  font-size: 0.95rem;
  font-weight: 500;
  font-family: var(--font-body);
  border-radius: 8px;
  border: none;
  cursor: pointer;
  transition: all 0.15s;
}

.btn-primary {
  background: var(--color-text);
  color: #fff;
}

.btn-primary:hover {
  background: #000;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.1);
}

/* === Sections === */
.section {
  padding: var(--spacing-section) 0;
}

.section-alt {
  background: var(--color-bg-alt);
}

.section-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-muted);
  margin-bottom: 44px;
}

.section-intro {
  font-size: 1.05rem;
  color: var(--color-text-secondary);
  line-height: 1.75;
  max-width: 580px;
  margin-bottom: 36px;
}

/* === Grid === */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

/* === Cards === */
.card {
  padding: 36px 32px;
  border: 1px solid var(--color-border);
  border-radius: 12px;
  background: var(--color-bg);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.card:hover {
  border-color: #cbd5e1;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
}

.card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 12px;
  letter-spacing: -0.015em;
}

.card p {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  line-height: 1.75;
}

/* === Scenarios === */
.scenario-list {
  list-style: none;
  padding: 0;
  max-width: 580px;
}

.scenario-list li {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  line-height: 1.65;
  padding: 14px 0 14px 24px;
  position: relative;
  border-bottom: 1px solid var(--color-border-light);
}

.scenario-list li:last-child {
  border-bottom: none;
}

.scenario-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 21px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--color-accent);
}

/* === Approach Steps === */
.approach-steps {
  display: grid;
  gap: 0;
}

.step {
  display: grid;
  grid-template-columns: 48px 128px 1fr;
  align-items: baseline;
  gap: 0;
  padding: 26px 0;
  border-bottom: 1px solid var(--color-border);
}

.step:first-child {
  border-top: 1px solid var(--color-border);
}

.step-num {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--color-text-muted);
  font-variant-numeric: tabular-nums;
}

.step h3 {
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.step p {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* === About === */
.about-text {
  font-size: 1.15rem;
  line-height: 1.85;
  color: var(--color-text-secondary);
  max-width: 560px;
}

/* === CTA / Contact === */
.section-cta {
  padding: var(--spacing-section) 0;
  background: var(--color-bg);
}

.cta-block {
  background: var(--color-text);
  border-radius: 16px;
  padding: 72px 56px;
  text-align: center;
  max-width: 640px;
  margin: 0 auto;
}

.cta-heading {
  font-size: 1.75rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: -0.03em;
  margin-bottom: 14px;
}

.cta-intro {
  font-size: 1rem;
  color: #94a3b8;
  line-height: 1.7;
  max-width: 400px;
  margin: 0 auto 28px;
}

.cta-email {
  display: block;
  font-size: 1rem;
  color: #e2e8f0;
  font-weight: 500;
  margin-bottom: 28px;
  transition: color 0.15s;
}

.cta-email:hover {
  color: #fff;
}

.cta-action .btn {
  background: #fff;
  color: var(--color-text);
}

.cta-action .btn:hover {
  background: #f1f5f9;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06);
}

/* === Footer === */
.footer {
  border-top: 1px solid var(--color-border);
  padding: 22px 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  gap: 16px;
}

.footer-brand {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text);
}

.footer-copy {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.footer-link {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-left: auto;
  transition: color 0.15s;
}

.footer-link:hover {
  color: var(--color-text);
}

/* === Privacy Page === */
.privacy-body {
  max-width: 640px;
  margin-top: 48px;
}

.privacy-updated {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: 40px;
}

.privacy-body h2 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-top: 36px;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}

.privacy-body p {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  line-height: 1.75;
  margin-bottom: 12px;
}

/* === Responsive === */
@media (max-width: 768px) {
  :root {
    --spacing-section: 80px;
  }

  .container {
    padding: 0 24px;
  }

  .hero {
    padding: 140px 0 112px;
  }

  .grid-3 {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .step {
    grid-template-columns: 1fr;
    gap: 3px;
    padding: 20px 0;
  }

  .step-num {
    font-size: 0.75rem;
  }

  .step p {
    margin-top: 4px;
  }

  .hero-actions {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }

  .cta-block {
    padding: 48px 32px;
    border-radius: 12px;
  }

  .cta-heading {
    font-size: 1.4rem;
  }
}

@media (max-width: 480px) {
  :root {
    --spacing-section: 64px;
  }

  .hero {
    padding: 120px 0 88px;
  }

  .hero h1 {
    font-size: 1.85rem;
  }

  .hero-sub {
    font-size: 1.05rem;
  }

  .card {
    padding: 28px 24px;
  }

  .cta-block {
    padding: 40px 24px;
  }
}