/**
 * Atman Design System - Landing Page Styles
 * Mobile-first responsive layout using --atman-* tokens
 */

/* ===== Layout ===== */

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--atman-space-4);
}

@media (min-width: 768px) {
  .container {
    padding: 0 var(--atman-space-6);
  }
}

/* ===== Header ===== */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--atman-z-fixed);
  background-color: transparent;
  transition: background-color var(--atman-duration-normal) var(--atman-easing-default),
              box-shadow var(--atman-duration-normal) var(--atman-easing-default);
}

.site-header.scrolled {
  background-color: var(--atman-color-background);
  box-shadow: var(--atman-shadow-sm);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.header-logo {
  height: 28px;
  width: auto;
}

.header-logo-light {
  display: block;
}

.header-logo-dark {
  display: none;
}

[data-theme="dark"] .header-logo-light {
  display: none;
}

[data-theme="dark"] .header-logo-dark {
  display: block;
}

.header-nav {
  display: none;
  gap: var(--atman-space-5);
}

@media (min-width: 768px) {
  .header-nav {
    display: flex;
  }
}

.header-nav a {
  font-size: var(--atman-font-size-sm);
  font-weight: var(--atman-font-weight-medium);
  color: var(--atman-color-text-secondary);
  text-decoration: none;
  transition: color var(--atman-duration-fast) var(--atman-easing-default);
}

.header-nav a:hover {
  color: var(--atman-color-text);
  text-decoration: none;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--atman-space-3);
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  padding: 0;
  border: 1px solid var(--atman-color-border);
  border-radius: var(--atman-radius-md);
  background: var(--atman-color-surface);
  color: var(--atman-color-text);
  cursor: pointer;
  transition: background-color var(--atman-duration-fast) var(--atman-easing-default);
}

.theme-toggle:hover {
  background: var(--atman-color-surface-hover);
}

.theme-toggle .icon-sun {
  display: none;
}

.theme-toggle .icon-moon {
  display: block;
}

[data-theme="dark"] .theme-toggle .icon-sun {
  display: block;
}

[data-theme="dark"] .theme-toggle .icon-moon {
  display: none;
}

.header-link {
  display: none;
  align-items: center;
  gap: var(--atman-space-1);
  font-size: var(--atman-font-size-sm);
  font-weight: var(--atman-font-weight-medium);
  color: var(--atman-color-text-secondary);
  text-decoration: none;
  transition: color var(--atman-duration-fast) var(--atman-easing-default);
}

.header-link:hover {
  color: var(--atman-color-text);
  text-decoration: none;
}

@media (min-width: 768px) {
  .header-link {
    display: flex;
  }
}

/* ===== Hero ===== */

.hero {
  display: flex;
  align-items: center;
  min-height: 100vh;
  padding-top: 64px;
  background-color: var(--atman-color-background);
}

.hero-content {
  text-align: center;
  max-width: 720px;
  margin: 0 auto;
}

.hero-logo {
  height: 56px;
  width: auto;
  margin: 0 auto var(--atman-space-6);
}

@media (min-width: 768px) {
  .hero-logo {
    height: 72px;
    margin-bottom: var(--atman-space-7);
  }
}

.hero-logo-light {
  display: block;
  margin: 0 auto;
}

.hero-logo-dark {
  display: none;
  margin: 0 auto;
}

[data-theme="dark"] .hero-logo-light {
  display: none;
}

[data-theme="dark"] .hero-logo-dark {
  display: block;
}

.hero h1 {
  font-size: var(--atman-font-size-3xl);
  font-weight: var(--atman-font-weight-bold);
  margin-bottom: var(--atman-space-4);
  letter-spacing: -0.02em;
}

@media (min-width: 768px) {
  .hero h1 {
    font-size: var(--atman-font-size-4xl);
  }
}

.hero-subtitle {
  font-size: var(--atman-font-size-lg);
  color: var(--atman-color-text-secondary);
  margin-bottom: var(--atman-space-2);
}

.hero-meta {
  font-size: var(--atman-font-size-sm);
  color: var(--atman-color-text-tertiary);
  margin-bottom: var(--atman-space-6);
}

.hero-badges {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--atman-space-2);
  margin-bottom: var(--atman-space-6);
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: var(--atman-space-3);
  flex-wrap: wrap;
}

/* ===== Section ===== */

.section {
  padding: var(--atman-space-9) 0;
}

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

.section-header {
  text-align: center;
  max-width: 600px;
  margin: 0 auto var(--atman-space-7);
}

.section-header h2 {
  font-size: var(--atman-font-size-2xl);
  margin-bottom: var(--atman-space-3);
}

@media (min-width: 768px) {
  .section-header h2 {
    font-size: var(--atman-font-size-3xl);
  }
}

.section-header p {
  color: var(--atman-color-text-secondary);
  font-size: var(--atman-font-size-lg);
}

/* ===== Features Grid ===== */

.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--atman-space-4);
}

@media (min-width: 640px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.feature-card {
  padding: var(--atman-space-5);
  background-color: var(--atman-color-surface);
  border: 1px solid var(--atman-color-border-subtle);
  border-radius: var(--atman-radius-lg);
  transition: box-shadow var(--atman-duration-normal) var(--atman-easing-default),
              border-color var(--atman-duration-normal) var(--atman-easing-default);
}

.feature-card:hover {
  box-shadow: var(--atman-shadow-md);
  border-color: var(--atman-color-border);
}

.feature-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  margin-bottom: var(--atman-space-4);
  background-color: var(--atman-color-primary-light);
  border-radius: var(--atman-radius-md);
  font-size: var(--atman-font-size-xl);
}

.feature-card h3 {
  font-size: var(--atman-font-size-lg);
  font-weight: var(--atman-font-weight-semibold);
  margin-bottom: var(--atman-space-2);
}

.feature-card p {
  font-size: var(--atman-font-size-sm);
  color: var(--atman-color-text-secondary);
  line-height: var(--atman-line-height-relaxed);
}

/* ===== Component Showcase ===== */

.showcase-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--atman-space-5);
}

@media (min-width: 640px) {
  .showcase-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .showcase-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.showcase-item {
  padding: var(--atman-space-5);
  background-color: var(--atman-color-surface);
  border: 1px solid var(--atman-color-border-subtle);
  border-radius: var(--atman-radius-lg);
  text-align: center;
}

.showcase-item h4 {
  font-size: var(--atman-font-size-sm);
  font-weight: var(--atman-font-weight-medium);
  color: var(--atman-color-text-secondary);
  margin-bottom: var(--atman-space-4);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.showcase-demo {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: var(--atman-space-2);
  min-height: 48px;
}

/* ===== Component Categories (Tab Panels) ===== */

.component-category {
  display: none;
  padding-top: var(--atman-space-5);
}

.component-category.active {
  display: block;
}

.category-tabs {
  display: flex;
  justify-content: center;
  gap: var(--atman-space-2);
  margin-bottom: var(--atman-space-5);
  flex-wrap: wrap;
}

.category-tab {
  padding: var(--atman-space-2) var(--atman-space-4);
  border: 1px solid var(--atman-color-border);
  border-radius: var(--atman-radius-full);
  background: transparent;
  color: var(--atman-color-text-secondary);
  font-family: var(--atman-font-family);
  font-size: var(--atman-font-size-sm);
  font-weight: var(--atman-font-weight-medium);
  cursor: pointer;
  transition: all var(--atman-duration-fast) var(--atman-easing-default);
}

.category-tab:hover {
  border-color: var(--atman-color-text);
  color: var(--atman-color-text);
}

.category-tab.active {
  background: var(--atman-color-primary);
  color: var(--atman-color-text-on-primary);
  border-color: var(--atman-color-primary);
}

/* ===== Quick Start ===== */

.quickstart-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--atman-space-5);
  max-width: 800px;
  margin: 0 auto;
}

.code-block {
  position: relative;
  background-color: var(--atman-color-neutral-900);
  border-radius: var(--atman-radius-lg);
  overflow: hidden;
}

[data-theme="dark"] .code-block {
  background-color: var(--atman-color-neutral-100);
}

.code-block-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--atman-space-3) var(--atman-space-4);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

[data-theme="dark"] .code-block-header {
  border-bottom-color: rgba(255, 255, 255, 0.06);
}

.code-block-label {
  font-family: var(--atman-font-family-mono);
  font-size: var(--atman-font-size-xs);
  color: rgba(255, 255, 255, 0.5);
  font-weight: var(--atman-font-weight-medium);
}

[data-theme="dark"] .code-block-label {
  color: var(--atman-color-text-tertiary);
}

.code-block pre {
  padding: var(--atman-space-4);
  margin: 0;
  background: transparent;
  border-radius: 0;
  overflow-x: auto;
}

.code-block code {
  font-family: var(--atman-font-family-mono);
  font-size: var(--atman-font-size-sm);
  color: #F5F5F5;
  background: transparent;
  padding: 0;
}

[data-theme="dark"] .code-block code {
  color: var(--atman-color-text);
}

.copy-btn {
  padding: var(--atman-space-1) var(--atman-space-2);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--atman-radius-sm);
  background: transparent;
  color: rgba(255, 255, 255, 0.5);
  font-family: var(--atman-font-family-mono);
  font-size: var(--atman-font-size-xs);
  cursor: pointer;
  transition: all var(--atman-duration-fast) var(--atman-easing-default);
}

.copy-btn:hover {
  border-color: rgba(255, 255, 255, 0.4);
  color: rgba(255, 255, 255, 0.8);
}

/* ===== Case Study Teaser ===== */

.teaser {
  text-align: center;
  max-width: 640px;
  margin: 0 auto;
  padding: var(--atman-space-7);
  background-color: var(--atman-color-surface);
  border: 1px solid var(--atman-color-border-subtle);
  border-radius: var(--atman-radius-lg);
}

.teaser h2 {
  font-size: var(--atman-font-size-2xl);
  margin-bottom: var(--atman-space-3);
}

.teaser p {
  color: var(--atman-color-text-secondary);
  margin-bottom: var(--atman-space-5);
  line-height: var(--atman-line-height-relaxed);
}

/* ===== Stats ===== */

.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--atman-space-4);
  max-width: 640px;
  margin: 0 auto;
}

@media (min-width: 640px) {
  .stats-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.stat {
  text-align: center;
}

.stat-value {
  font-size: var(--atman-font-size-3xl);
  font-weight: var(--atman-font-weight-bold);
  color: var(--atman-color-text);
  line-height: 1;
  margin-bottom: var(--atman-space-1);
}

.stat-label {
  font-size: var(--atman-font-size-sm);
  color: var(--atman-color-text-tertiary);
}

/* ===== Footer ===== */

.site-footer {
  padding: var(--atman-space-7) 0;
  border-top: 1px solid var(--atman-color-border-subtle);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--atman-space-4);
  text-align: center;
}

.footer-logo {
  height: 24px;
  width: auto;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--atman-space-4);
}

.footer-nav a {
  font-size: var(--atman-font-size-sm);
  color: var(--atman-color-text-secondary);
  text-decoration: none;
}

.footer-nav a:hover {
  color: var(--atman-color-text);
  text-decoration: none;
}

.footer-meta {
  font-size: var(--atman-font-size-xs);
  color: var(--atman-color-text-tertiary);
}

/* ===== Scroll Animations ===== */

.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--atman-duration-slow) var(--atman-easing-default),
              transform var(--atman-duration-slow) var(--atman-easing-default);
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .fade-in {
    opacity: 1;
    transform: none;
    transition: none;
  }
}