/* Brutalist/Editorial Landing Page */

:root {
  --black: #000000;
  --white: #ffffff;
  --gray-100: #f5f5f5;
  --gray-200: #e5e5e5;
  --gray-300: #d4d4d4;
  --gray-700: #404040;
  --gray-800: #262626;
  --gray-900: #171717;
  --accent: #3b82f6;
}

@media (prefers-color-scheme: dark) {
  :root {
    --black: #ffffff;
    --white: #0a0a0a;
    --gray-100: #171717;
    --gray-200: #262626;
    --gray-300: #404040;
    --gray-700: #d4d4d4;
    --gray-800: #e5e5e5;
    --gray-900: #f5f5f5;
    --accent: #60a5fa;
  }
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', system-ui, sans-serif;
  line-height: 1.6;
  color: var(--black);
  background: var(--white);
  font-size: 18px;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
.header {
  border-bottom: 2px solid var(--black);
  padding: 20px 0;
}

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

.logo {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.02em;
  text-decoration: none;
  color: var(--black);
}

.sign-in {
  font-size: 16px;
  font-weight: 500;
  text-decoration: none;
  color: var(--gray-700);
  border: 2px solid var(--black);
  padding: 8px 20px;
  transition: all 0.15s;
  border-radius: 6px;
}

.sign-in:hover {
  background: var(--black);
  color: var(--white);
}

/* Hero */
.hero {
  padding: 120px 0 80px;
  text-align: center;
}

.badge-row {
  display: flex;
  gap: 12px;
  justify-content: center;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.badge {
  font-size: 14px;
  font-weight: 600;
  padding: 6px 14px;
  border: 2px solid var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent);
  border-radius: 8px;
}

.hero h1 {
  font-size: clamp(40px, 8vw, 72px);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 32px;
  letter-spacing: -0.03em;
}

.lead {
  font-size: clamp(20px, 3vw, 24px);
  line-height: 1.5;
  max-width: 800px;
  margin: 0 auto 48px;
  color: var(--gray-700);
}

.cta-group {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.btn-primary {
  display: inline-block;
  font-size: 18px;
  font-weight: 600;
  padding: 16px 48px;
  background: var(--accent);
  color: var(--white);
  text-decoration: none;
  border: 2px solid var(--accent);
  transition: all 0.15s;
  cursor: pointer;
  border-radius: 8px;
}

.btn-primary:hover {
  background: transparent;
  color: var(--accent);
}

.btn-large {
  font-size: 20px;
  padding: 20px 56px;
}

.hint {
  font-size: 14px;
  color: var(--gray-700);
}

/* Sections */
section {
  padding: 80px 0;
  border-top: 2px solid var(--gray-200);
}

h2 {
  font-size: clamp(36px, 6vw, 56px);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 48px;
  letter-spacing: -0.02em;
}

/* Why */
.why {
  background: var(--gray-100);
}

.split {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 60px;
}

.split-left h2 {
  margin-bottom: 0;
}

.large {
  font-size: 22px;
  line-height: 1.6;
  margin-bottom: 24px;
  color: var(--gray-800);
}

.large strong {
  font-weight: 700;
  color: var(--black);
}

/* How */
.how h2 {
  text-align: center;
}

.flow {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 48px;
  margin-bottom: 60px;
}

.flow-item {
  position: relative;
}

.flow-number {
  font-size: 48px;
  font-weight: 900;
  color: var(--accent);
  margin-bottom: 16px;
  letter-spacing: -0.05em;
}

.flow-item h3 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 12px;
}

.flow-item p {
  color: var(--gray-700);
}

.technical-note {
  border: 2px solid var(--black);
  padding: 32px;
  background: var(--gray-100);
  border-radius: 8px;
}

.technical-note p {
  font-size: 16px;
  line-height: 1.6;
  color: var(--gray-800);
}

.technical-note strong {
  font-weight: 700;
  color: var(--black);
}

/* Who */
.who {
  background: var(--gray-100);
}

.who h2 {
  text-align: center;
}

.use-cases {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2px;
  background: var(--black);
  border: 2px solid var(--black);
}

.use-case {
  background: var(--white);
  padding: 32px;
}

.use-case h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 8px;
}

.use-case p {
  color: var(--gray-700);
  font-size: 16px;
}

/* Comparison */
.comparison h2 {
  text-align: center;
}

.compare-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2px;
  background: var(--black);
  border: 2px solid var(--black);
  margin-bottom: 40px;
}

.compare-item {
  background: var(--white);
  padding: 40px;
}

.compare-item.us {
  background: var(--gray-100);
}

.compare-item h3 {
  font-size: 28px;
  font-weight: 800;
  margin-bottom: 24px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.compare-item ul {
  list-style: none;
}

.compare-item li {
  padding: 12px 0;
  border-bottom: 1px solid var(--gray-200);
  font-size: 18px;
}

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

.compare-note {
  font-size: 18px;
  line-height: 1.6;
  color: var(--gray-700);
  max-width: 700px;
  margin: 0 auto;
  text-align: center;
}

/* FAQ */
.faq {
  background: var(--gray-100);
}

.faq h2 {
  text-align: center;
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-list dt {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 12px;
  margin-top: 40px;
}

.faq-list dt:first-child {
  margin-top: 0;
}

.faq-list dd {
  font-size: 18px;
  line-height: 1.6;
  color: var(--gray-800);
  padding-left: 0;
}

/* Final CTA */
.final-cta {
  text-align: center;
  padding: 120px 0;
  background: var(--black);
  color: var(--white);
  border-top: none;
}

.final-cta h2 {
  color: var(--white);
}

.final-cta p {
  font-size: 20px;
  margin-bottom: 32px;
  color: var(--gray-300);
}

.final-cta .btn-primary {
  background: var(--accent);
  color: var(--white);
  border-color: var(--accent);
}

.final-cta .btn-primary:hover {
  background: transparent;
  color: var(--accent);
}

.footnote {
  margin-top: 32px;
  font-size: 14px;
}

.footnote a {
  color: var(--gray-300);
  text-decoration: underline;
}

.footnote a:hover {
  color: var(--white);
}

/* Footer */
.footer {
  border-top: 2px solid var(--black);
  padding: 60px 0 40px;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 40px;
  margin-bottom: 40px;
}

.footer-grid p {
  margin-bottom: 8px;
  font-size: 16px;
}

.footer-grid strong {
  font-weight: 700;
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-grid ul {
  list-style: none;
}

.footer-grid li {
  margin-bottom: 6px;
}

.footer-grid a {
  color: var(--gray-700);
  text-decoration: none;
  font-size: 16px;
}

.footer-grid a:hover {
  color: var(--black);
  text-decoration: underline;
}

.footer-bottom {
  border-top: 2px solid var(--gray-200);
  padding-top: 24px;
  text-align: center;
}

.footer-bottom p {
  font-size: 14px;
  color: var(--gray-700);
}

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

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

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

  .use-cases {
    grid-template-columns: 1fr;
  }

  section {
    padding: 60px 0;
  }

  .hero {
    padding: 80px 0 60px;
  }

  .final-cta {
    padding: 80px 0;
  }

  .badge-row {
    margin-bottom: 32px;
  }
}

/* Selection */
::selection {
  background: var(--black);
  color: var(--white);
}

/* Focus */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}