/* genX Promotional Site - Muji Style */

:root {
  --color-bg: #fafafa;
  --color-bg-warm: #f5f3f0;
  --color-white: #ffffff;
  --color-text: #333333;
  --color-text-light: #666666;
  --color-text-muted: #999999;
  --color-border: #e8e4df;
  --color-accent: #c4463a;
  --color-accent-soft: #d4736a;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', monospace;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 6rem;
  --max-width: 1200px;
  --transition: 0.2s ease;
}

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

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

body {
  font-family: var(--font-sans);
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 400;
  line-height: 1.3;
  letter-spacing: -0.02em;
}

h1 {
  font-size: 3rem;
  font-weight: 300;
}

h2 {
  font-size: 1.75rem;
  margin-bottom: var(--spacing-md);
}

h3 {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-sm);
}

p {
  margin-bottom: var(--spacing-sm);
}

a {
  color: var(--color-text);
  text-decoration: none;
  border-bottom: 1px solid var(--color-border);
  transition: border-color var(--transition);
}

a:hover {
  border-color: var(--color-text);
}

/* Layout */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.section {
  padding: var(--spacing-xl) 0;
}

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

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

/* Header */
.header {
  padding: var(--spacing-sm) 0;
  position: sticky;
  top: 0;
  background: var(--color-bg);
  z-index: 100;
  border-bottom: 1px solid var(--color-border);
}

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

.logo {
  font-size: 1.5rem;
  font-weight: 400;
  letter-spacing: -0.03em;
  border: none;
}

.logo .x {
  color: var(--color-accent);
}

.nav {
  display: flex;
  gap: var(--spacing-md);
}

.nav a {
  font-size: 0.9rem;
  color: var(--color-text-light);
  border: none;
  padding: var(--spacing-xs) 0;
  position: relative;
}

.nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--color-text);
  transition: width var(--transition);
}

.nav a:hover::after,
.nav a.active::after {
  width: 100%;
}

.nav a:hover,
.nav a.active {
  color: var(--color-text);
}

/* Hero */
.hero {
  padding: var(--spacing-xl) 0;
  text-align: center;
  min-height: 70vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.hero__title {
  font-size: clamp(2.5rem, 8vw, 5rem);
  font-weight: 300;
  margin-bottom: var(--spacing-md);
  letter-spacing: -0.03em;
}

.hero__title .x {
  color: var(--color-accent);
}

.hero__subtitle {
  font-size: 1.25rem;
  color: var(--color-text-light);
  max-width: 600px;
  margin: 0 auto var(--spacing-lg);
  font-weight: 400;
}

.hero__tagline {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--spacing-md);
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.875rem 2rem;
  font-size: 0.9rem;
  font-weight: 500;
  border: 1px solid var(--color-text);
  background: transparent;
  color: var(--color-text);
  cursor: pointer;
  transition: all var(--transition);
  border-radius: 0;
  text-decoration: none;
}

.btn:hover {
  background: var(--color-text);
  color: var(--color-white);
}

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

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

.btn-group {
  display: flex;
  gap: var(--spacing-sm);
  justify-content: center;
  flex-wrap: wrap;
}

/* Features Grid */
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-md);
}

.feature {
  padding: var(--spacing-md);
  background: var(--color-white);
  border: 1px solid var(--color-border);
}

.feature__prefix {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--spacing-xs);
}

.feature__title {
  font-size: 1.125rem;
  margin-bottom: var(--spacing-xs);
}

.feature__desc {
  font-size: 0.9rem;
  color: var(--color-text-light);
  margin: 0;
}

/* Code Blocks */
pre, code {
  font-family: var(--font-mono);
  font-size: 0.875rem;
}

code {
  background: var(--color-bg-warm);
  padding: 0.125em 0.375em;
  border-radius: 2px;
}

pre {
  background: var(--color-text);
  color: var(--color-bg);
  padding: var(--spacing-md);
  overflow-x: auto;
  line-height: 1.5;
}

pre code {
  background: none;
  padding: 0;
  color: inherit;
}

.code-example {
  margin: var(--spacing-md) 0;
}

.code-example__label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-xs);
}

/* Showcase */
.showcase {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
  align-items: center;
}

.showcase--reverse {
  direction: rtl;
}

.showcase--reverse > * {
  direction: ltr;
}

.showcase__content {
  padding: var(--spacing-md) 0;
}

.showcase__visual {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  padding: var(--spacing-md);
}

/* Stats */
.stats {
  display: flex;
  justify-content: center;
  gap: var(--spacing-lg);
  text-align: center;
  flex-wrap: wrap;
}

.stat {
  min-width: 120px;
}

.stat__value {
  font-size: 2.5rem;
  font-weight: 300;
  line-height: 1;
  margin-bottom: var(--spacing-xs);
}

.stat__label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-muted);
}

/* Modules List */
.modules {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1px;
  background: var(--color-border);
  border: 1px solid var(--color-border);
}

.module {
  background: var(--color-white);
  padding: var(--spacing-md);
  text-align: center;
  border: none;
  transition: background var(--transition);
}

.module:hover {
  background: var(--color-bg-warm);
}

.module__name {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  margin-bottom: var(--spacing-xs);
}

.module__name .x {
  color: var(--color-accent);
}

.module__desc {
  font-size: 0.875rem;
  color: var(--color-text-light);
  margin: 0;
}

/* Demo Page */
.demo-frame {
  width: 100%;
  height: calc(100vh - 80px);
  border: none;
}

/* Documentation */
.docs {
  display: grid;
  grid-template-columns: 250px 1fr;
  gap: var(--spacing-lg);
  min-height: calc(100vh - 80px);
}

.docs__nav {
  padding: var(--spacing-md) 0;
  position: sticky;
  top: 80px;
  height: fit-content;
}

.docs__nav-title {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-sm);
}

.docs__nav-list {
  list-style: none;
}

.docs__nav-list a {
  display: block;
  padding: var(--spacing-xs) 0;
  font-size: 0.9rem;
  color: var(--color-text-light);
  border: none;
}

.docs__nav-list a:hover,
.docs__nav-list a.active {
  color: var(--color-text);
}

.docs__content {
  padding: var(--spacing-md) 0;
  max-width: 800px;
}

.docs__content h2 {
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--color-border);
}

.docs__content h2:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: none;
}

/* Footer */
.footer {
  padding: var(--spacing-lg) 0;
  border-top: 1px solid var(--color-border);
  text-align: center;
}

.footer__text {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* Utilities */
.text-center {
  text-align: center;
}

.text-muted {
  color: var(--color-text-muted);
}

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }

/* Responsive */
@media (max-width: 768px) {
  :root {
    --spacing-lg: 3rem;
    --spacing-xl: 4rem;
  }

  .nav {
    gap: var(--spacing-sm);
  }

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

  .showcase--reverse {
    direction: ltr;
  }

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

  .docs__nav {
    position: static;
    border-bottom: 1px solid var(--color-border);
    padding-bottom: var(--spacing-md);
  }
}