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

:root {
  --dark: #212427;
  --white: #ffffff;
  --gray: #6b7280;
  --border: #e0e0e0;
  --bg-alt: #f9f9f9;
  --bg-code: #212427;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 72px;
}

body {
  font-family: var(--font);
  background: var(--white);
  color: var(--dark);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--dark);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

a:hover {
  text-decoration-thickness: 2px;
}

code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--bg-alt);
  padding: 2px 6px;
  border-radius: 3px;
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Nav */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: var(--white);
  border-bottom: 1px solid var(--border);
}

.nav.scrolled {
  border-bottom-color: var(--border);
}

.nav-inner {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}

.nav-logo {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--dark);
  text-decoration: none;
}

.nav-logo:hover {
  color: var(--dark);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
  list-style: none;
}

.nav-links a {
  font-size: 0.85rem;
  color: var(--gray);
  text-decoration: none;
}

.nav-links a:hover {
  color: var(--dark);
}

.nav-github {
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 1.5px;
  background: var(--dark);
}

/* Hero */
.hero {
  padding: 120px 0 72px;
  text-align: center;
  border-bottom: 1px solid var(--border);
}

.hero-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--gray);
  border: 1px solid var(--border);
  padding: 4px 12px;
  border-radius: 3px;
  margin-bottom: 24px;
}

.hero-title {
  font-size: clamp(2rem, 4.5vw, 2.8rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 16px;
}

.hero-subtitle {
  font-size: 1.1rem;
  color: var(--gray);
  margin-bottom: 12px;
}

.hero-desc {
  font-size: 0.95rem;
  color: var(--gray);
  max-width: 520px;
  margin: 0 auto 32px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  margin-bottom: 40px;
}

.btn {
  display: inline-flex;
  align-items: center;
  font-size: 0.9rem;
  font-weight: 500;
  padding: 10px 24px;
  border-radius: 4px;
  border: none;
  cursor: pointer;
  text-decoration: none;
}

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

.btn-primary:hover {
  opacity: 0.85;
  color: var(--white);
}

.hero-install {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 8px 14px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--gray);
}

.copy-btn {
  background: none;
  border: none;
  color: var(--gray);
  cursor: pointer;
  padding: 2px;
  display: flex;
  align-items: center;
}

.copy-btn:hover {
  color: var(--dark);
}

.copy-btn.copied {
  color: var(--dark);
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 48px;
  flex-wrap: wrap;
}

.stat {
  text-align: center;
}

.stat-value {
  display: block;
  font-size: 1.3rem;
  font-weight: 600;
  font-family: var(--font-mono);
}

.stat-label {
  font-size: 0.75rem;
  color: var(--gray);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* Sections */
.section {
  padding: 72px 0;
}

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

.section-title {
  font-size: 1.6rem;
  font-weight: 600;
  text-align: center;
  margin-bottom: 8px;
  letter-spacing: -0.02em;
}

.section-subtitle {
  text-align: center;
  color: var(--gray);
  max-width: 540px;
  margin: 0 auto 40px;
  font-size: 0.95rem;
}

/* Comparison */
.comparison {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  max-width: 800px;
  margin: 0 auto;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: 4px;
  overflow: hidden;
}

.comparison-card {
  background: var(--white);
}

.comparison-header {
  padding: 10px 16px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--border);
  color: var(--gray);
}

.comparison-before .comparison-header {
  color: var(--gray);
}

.comparison-after .comparison-header {
  color: var(--dark);
}

.comparison-card pre {
  margin: 0;
  border-radius: 0;
  border: none;
}

/* Features */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: 4px;
  overflow: hidden;
}

.feature-card {
  background: var(--white);
  padding: 24px;
}

.feature-icon {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--dark);
  margin-bottom: 12px;
}

.feature-card h3 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 6px;
}

.feature-card p {
  font-size: 0.85rem;
  color: var(--gray);
  line-height: 1.6;
}

/* What's New */
.whats-new-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: 4px;
  overflow: hidden;
}

.whats-new-card {
  background: var(--white);
  padding: 24px;
}

.whats-new-icon {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--dark);
  margin-bottom: 10px;
}

.whats-new-card h3 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 6px;
}

.whats-new-card p {
  font-size: 0.85rem;
  color: var(--gray);
  line-height: 1.6;
}

/* Comparison Table */
.table-wrap {
  overflow-x: auto;
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
  border: 1px solid var(--border);
  border-radius: 4px;
}

.comparison-table th {
  text-align: left;
  padding: 10px 16px;
  font-weight: 600;
  color: var(--gray);
  border-bottom: 1px solid var(--border);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  background: var(--bg-alt);
}

.comparison-table td {
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
}

.comparison-table tr:last-child td {
  border-bottom: none;
}

td.yes {
  font-weight: 500;
}

td.no {
  color: var(--gray);
}

td.partial {
  color: var(--gray);
  font-style: italic;
}

/* Tabs */
.tabs {
  max-width: 760px;
  margin: 0 auto;
}

.tab-buttons {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--border);
  overflow-x: auto;
}

.tab-btn {
  padding: 10px 18px;
  font-size: 0.85rem;
  font-weight: 500;
  font-family: var(--font);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--gray);
  cursor: pointer;
  white-space: nowrap;
  margin-bottom: -1px;
}

.tab-btn:hover {
  color: var(--dark);
}

.tab-btn.active {
  color: var(--dark);
  border-bottom-color: var(--dark);
}

.tab-panel {
  display: none;
  padding: 24px 0;
}

.tab-panel.active {
  display: block;
}

/* Code */
pre {
  background: var(--bg-code);
  border-radius: 4px;
  padding: 18px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.83rem;
  line-height: 1.7;
  color: #e0e0e0;
}

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

.kw { color: #c792ea; }
.fn { color: #82aaff; }
.str { color: #c3e88d; }
.cm { color: #636d83; }
.tag { color: #f07178; }
.attr { color: #ffcb6b; }
.num { color: #f78c6c; }
.type { color: #ffcb6b; }

/* API */
.api-entry {
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
}

.api-entry:last-child {
  border-bottom: none;
}

.api-entry h3 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.api-entry h3 code {
  font-size: 0.85rem;
}

.api-entry > p {
  color: var(--gray);
  font-size: 0.88rem;
  margin-bottom: 12px;
}

.api-entry pre {
  margin-top: 12px;
}

.api-props table,
.api-methods table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.83rem;
  margin: 10px 0;
}

.api-props th,
.api-methods th {
  text-align: left;
  padding: 8px 12px;
  color: var(--gray);
  font-weight: 600;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  border-bottom: 1px solid var(--border);
}

.api-props td,
.api-methods td {
  padding: 8px 12px;
  border-bottom: 1px solid var(--border);
  color: var(--gray);
}

.api-notice {
  border-left: 3px solid var(--dark);
  padding: 12px 16px;
  color: var(--gray);
  font-size: 0.88rem;
  margin-bottom: 12px;
  background: var(--bg-alt);
}

.deprecated-badge {
  font-size: 0.68rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--gray);
  border: 1px solid var(--border);
  padding: 2px 6px;
  border-radius: 3px;
}

/* Strategy Grid */
.strategy-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: 4px;
  overflow: hidden;
  margin: 12px 0;
}

.strategy-card {
  background: var(--white);
  padding: 14px;
  text-align: center;
}

.strategy-name {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--gray);
  margin-bottom: 4px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.strategy-card code {
  font-size: 0.8rem;
  background: none;
  padding: 0;
  color: var(--dark);
}

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

.example-card {
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 24px;
}

.example-card h3 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 6px;
}

.example-card > p {
  font-size: 0.85rem;
  color: var(--gray);
  margin-bottom: 14px;
  line-height: 1.5;
}

.example-card pre {
  font-size: 0.8rem;
}

/* Migration */
.migration-steps {
  max-width: 640px;
  margin: 0 auto;
}

.migration-step {
  display: flex;
  gap: 20px;
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
}

.migration-step:last-child {
  border-bottom: none;
}

.step-number {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1.5px solid var(--dark);
  font-weight: 600;
  font-size: 0.85rem;
  border-radius: 50%;
}

.step-content {
  flex: 1;
  min-width: 0;
}

.step-content h3 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 10px;
}

.step-content p {
  color: var(--gray);
  font-size: 0.88rem;
  margin-bottom: 6px;
}

.step-note {
  font-size: 0.82rem;
  color: var(--gray);
  font-style: italic;
}

.migration-diff {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.diff-remove,
.diff-add {
  flex: 1;
  min-width: 180px;
}

.diff-remove pre {
  border-left: 3px solid #999;
}

.diff-remove pre code {
  color: #aaa;
}

.diff-add pre {
  border-left: 3px solid var(--dark);
}

.diff-add pre code {
  color: #e0e0e0;
}

.diff-arrow {
  color: var(--gray);
  flex-shrink: 0;
}

/* Framework Grid */
.framework-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: 4px;
  overflow: hidden;
}

.framework-card {
  background: var(--white);
  padding: 20px;
  text-align: center;
}

.framework-card h3 {
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 6px;
}

.framework-card p {
  font-size: 0.82rem;
  color: var(--gray);
  line-height: 1.5;
}

/* Footer */
.footer {
  padding: 32px 0;
  border-top: 1px solid var(--border);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-brand strong {
  font-size: 0.85rem;
}

.footer-brand p {
  font-size: 0.8rem;
  color: var(--gray);
  margin-top: 2px;
}

.footer-links {
  display: flex;
  gap: 20px;
}

.footer-links a {
  font-size: 0.82rem;
  color: var(--gray);
  text-decoration: none;
}

.footer-links a:hover {
  color: var(--dark);
}

/* Responsive */
@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 56px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--white);
    border-bottom: 1px solid var(--border);
    padding: 12px 24px;
    gap: 10px;
  }

  .nav-links.open {
    display: flex;
  }

  .hero {
    padding: 100px 0 48px;
  }

  .hero-stats {
    gap: 24px;
  }

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

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

  .whats-new-grid {
    grid-template-columns: 1fr;
  }

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

  .strategy-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .framework-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .migration-diff {
    flex-direction: column;
  }

  .diff-arrow {
    transform: rotate(90deg);
  }

  .tab-btn {
    padding: 8px 14px;
    font-size: 0.8rem;
  }

  .footer-inner {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.7rem;
  }

  .section {
    padding: 48px 0;
  }

  .section-title {
    font-size: 1.4rem;
  }

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

  pre {
    font-size: 0.76rem;
    padding: 14px;
  }
}

/* Page Header (for inner pages) */
.page-header {
  padding: 96px 0 48px;
  text-align: center;
  border-bottom: 1px solid var(--border);
}

.page-header .hero-badge {
  margin-bottom: 16px;
}

.page-header h1 {
  font-size: clamp(1.6rem, 3.5vw, 2.2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 10px;
}

.page-header p {
  font-size: 0.95rem;
  color: var(--gray);
  max-width: 520px;
  margin: 0 auto;
}

/* Active nav link */
.nav-links a.active {
  color: var(--dark);
  font-weight: 500;
}

/* FAQ */
.faq-list {
  max-width: 720px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid var(--border);
}

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

.faq-question {
  padding: 18px 0;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.faq-question::-webkit-details-marker {
  display: none;
}

.faq-question::after {
  content: '+';
  font-size: 1.2rem;
  font-weight: 400;
  color: var(--gray);
  flex-shrink: 0;
  margin-left: 16px;
}

.faq-item[open] .faq-question::after {
  content: '\2212';
}

.faq-answer {
  padding: 0 0 18px;
}

.faq-answer p {
  font-size: 0.88rem;
  color: var(--gray);
  line-height: 1.7;
}

/* Animations */
.fade-in {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.4s ease, transform 0.4s ease;
}

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