/* ========================================
   0. Design Tokens
   ======================================== */

:root {
  --color-bg: #ffffff;
  --color-text: #111111;
  --color-muted: #6b7280;
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-surface: #f9fafb;
  --color-border: #e5e7eb;
  --color-code-bg: #1e1e2e;
  --color-code-text: #cdd6f4;
  --color-success: #059669;

  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Helvetica, Arial, sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Fira Mono", Menlo, Consolas,
    monospace;

  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;
  --space-4xl: 96px;

  --width-content: 720px;
  --width-wide: 1120px;

  --radius: 6px;
  --radius-lg: 10px;
}

/* ========================================
   1. Reset & Base
   ======================================== */

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--color-primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

img {
  max-width: 100%;
  display: block;
}

/* ========================================
   2. Typography
   ======================================== */

h1, h2, h3, h4 {
  line-height: 1.25;
  font-weight: 700;
}

h1 {
  font-family: var(--font-mono);
  font-size: 2.5rem;
  letter-spacing: -0.03em;
}

h2 {
  font-size: 1.75rem;
  margin-top: var(--space-3xl);
  margin-bottom: var(--space-md);
}

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

h4 {
  font-size: 1rem;
  margin-top: var(--space-lg);
  margin-bottom: var(--space-sm);
}

code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--color-surface);
  padding: 2px 6px;
  border-radius: 3px;
}

pre {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.5;
  background: var(--color-code-bg);
  color: var(--color-code-text);
  padding: var(--space-lg);
  border-radius: var(--radius-lg);
  overflow-x: auto;
}

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

.prose p {
  margin-bottom: var(--space-md);
}

.prose ul,
.prose ol {
  margin-bottom: var(--space-md);
  padding-left: var(--space-lg);
}

.prose li {
  margin-bottom: var(--space-xs);
}

.prose blockquote {
  border-left: 3px solid var(--color-primary);
  padding-left: var(--space-md);
  color: var(--color-muted);
  margin-bottom: var(--space-md);
}

/* ========================================
   3. Layout
   ======================================== */

.container {
  max-width: var(--width-content);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.container--wide {
  max-width: var(--width-wide);
}

.section {
  padding: var(--space-4xl) 0;
}

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

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-xl);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
}

.text-center {
  text-align: center;
}

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

/* ========================================
   4. Components — Nav
   ======================================== */

.site-header {
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  z-index: 100;
}

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

.nav__logo {
  text-decoration: none;
  color: var(--color-text);
}

.nav__logo-text {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.nav__link {
  color: var(--color-muted);
  font-size: 0.9375rem;
  font-weight: 500;
  text-decoration: none;
  transition: color 0.15s;
}

.nav__link:hover,
.nav__link--active {
  color: var(--color-text);
  text-decoration: none;
}

.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-sm);
}

.nav__toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-text);
  transition: transform 0.2s;
}

/* ========================================
   5. Components — Buttons
   ======================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 600;
  padding: 10px 20px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.15s, border-color 0.15s;
}

.btn:hover {
  text-decoration: none;
}

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

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

.btn--secondary {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}

.btn--secondary:hover {
  border-color: var(--color-text);
}

.btn--sm {
  font-size: 0.875rem;
  padding: 6px 14px;
}

.btn--lg {
  font-size: 1rem;
  padding: 14px 28px;
}

/* ========================================
   6. Components — Cards
   ======================================== */

.card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: box-shadow 0.15s;
}

.card:hover {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
}

.card__icon {
  font-size: 1.5rem;
  margin-bottom: var(--space-sm);
}

.card__title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.card__text {
  color: var(--color-muted);
  font-size: 0.9375rem;
  line-height: 1.5;
}

/* ========================================
   7. Components — Code Blocks
   ======================================== */

.code-block {
  position: relative;
  margin-bottom: var(--space-lg);
}

.code-block pre {
  margin: 0;
}

.code-block__copy {
  position: absolute;
  top: var(--space-sm);
  right: var(--space-sm);
  background: rgba(255, 255, 255, 0.1);
  color: var(--color-code-text);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius);
  padding: 4px 10px;
  font-family: var(--font-body);
  font-size: 0.75rem;
  cursor: pointer;
  transition: background 0.15s;
}

.code-block__copy:hover {
  background: rgba(255, 255, 255, 0.2);
}

/* ========================================
   8. Components — Tables
   ======================================== */

table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: var(--space-lg);
  font-size: 0.9375rem;
}

th, td {
  text-align: left;
  padding: var(--space-sm) var(--space-md);
  border-bottom: 1px solid var(--color-border);
}

th {
  font-weight: 600;
  color: var(--color-muted);
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ========================================
   9. Components — Tags
   ======================================== */

.tag {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-primary);
  background: rgba(37, 99, 235, 0.08);
  padding: 2px 10px;
  border-radius: 20px;
}

/* ========================================
   10. Components — FAQ Accordion
   ======================================== */

details {
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-md) 0;
}

details summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 1.0625rem;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

details summary::after {
  content: "+";
  font-size: 1.25rem;
  color: var(--color-muted);
  transition: transform 0.2s;
}

details[open] summary::after {
  content: "\2212";
}

details summary::-webkit-details-marker {
  display: none;
}

details p {
  color: var(--color-muted);
  margin-top: var(--space-sm);
  line-height: 1.6;
}

/* ========================================
   11. Page — Hero
   ======================================== */

.hero {
  text-align: center;
  padding: var(--space-4xl) 0 var(--space-3xl);
}

.hero h1 {
  max-width: 700px;
  margin: 0 auto var(--space-lg);
}

.hero__subtitle {
  font-size: 1.25rem;
  color: var(--color-muted);
  max-width: 560px;
  margin: 0 auto var(--space-xl);
  line-height: 1.5;
}

.hero__actions {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  margin-bottom: var(--space-3xl);
}

.hero__code {
  max-width: 640px;
  margin: 0 auto;
  text-align: left;
}

/* ========================================
   12. Page — Features
   ======================================== */

.features {
  padding: var(--space-4xl) 0;
}

.features__header {
  text-align: center;
  margin-bottom: var(--space-2xl);
}

.features__header h2 {
  margin-top: 0;
}

.features__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

/* ========================================
   13. Page — How It Works
   ======================================== */

.how-it-works {
  padding: var(--space-4xl) 0;
  background: var(--color-surface);
}

.how-it-works__header {
  text-align: center;
  margin-bottom: var(--space-2xl);
}

.how-it-works__header h2 {
  margin-top: 0;
}

.how-it-works__steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
  max-width: var(--width-wide);
  margin: 0 auto;
}

.step {
  text-align: center;
}

.step__number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1rem;
  margin-bottom: var(--space-md);
}

.step__title {
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.step__text {
  color: var(--color-muted);
  font-size: 0.9375rem;
}

/* ========================================
   14. Page — CTA
   ======================================== */

.cta {
  text-align: center;
  padding: var(--space-4xl) 0;
}

.cta h2 {
  margin-top: 0;
  margin-bottom: var(--space-md);
}

.cta p {
  color: var(--color-muted);
  margin-bottom: var(--space-xl);
  font-size: 1.125rem;
}

/* ========================================
   15. Page — Pricing
   ======================================== */

.pricing {
  padding: var(--space-4xl) 0;
}

.pricing__header {
  text-align: center;
  margin-bottom: var(--space-2xl);
}

.pricing__header h2 {
  margin-top: 0;
}

.pricing__header p {
  color: var(--color-muted);
  font-size: 1.125rem;
}

.pricing__cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-xl);
  max-width: 800px;
  margin: 0 auto;
}

.pricing-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
}

.pricing-card--highlight {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 1px var(--color-primary);
  position: relative;
}

.pricing-card--highlight::before {
  content: "Popular";
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-primary);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 2px 12px;
  border-radius: 20px;
}

.pricing-card__name {
  font-weight: 600;
  font-size: 1.125rem;
  margin-bottom: var(--space-sm);
}

.pricing-card__price {
  font-family: var(--font-mono);
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: var(--space-xs);
}

.pricing-card__period {
  color: var(--color-muted);
  font-size: 0.875rem;
  margin-bottom: var(--space-lg);
}

.pricing-card__features {
  list-style: none;
  margin-bottom: var(--space-xl);
}

.pricing-card__features li {
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.9375rem;
}

.pricing-card__features li:last-child {
  border-bottom: none;
}

.pricing-card .btn {
  width: 100%;
}

/* ========================================
   16. Page — Docs
   ======================================== */

.docs-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: var(--space-2xl);
  max-width: var(--width-wide);
  margin: 0 auto;
  padding: var(--space-2xl) var(--space-lg);
}

.docs-toc {
  position: sticky;
  top: 80px;
  align-self: start;
  max-height: calc(100vh - 100px);
  overflow-y: auto;
  font-size: 0.875rem;
  border-right: 1px solid var(--color-border);
  padding-right: var(--space-lg);
}

.docs-toc nav ul {
  list-style: none;
}

.docs-toc nav ul li {
  margin-bottom: var(--space-sm);
}

.docs-toc nav ul li a {
  color: var(--color-muted);
  text-decoration: none;
}

.docs-toc nav ul li a:hover {
  color: var(--color-text);
}

.docs-toc nav > ul > li > ul {
  padding-left: var(--space-md);
  margin-top: var(--space-xs);
}

.docs-content {
  min-width: 0;
}

.docs-content h1 {
  margin-bottom: var(--space-lg);
}

.api-endpoint {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-sm) var(--space-md);
  margin: var(--space-lg) 0 var(--space-md);
  font-family: var(--font-mono);
  font-size: 0.9375rem;
}

.api-endpoint__method {
  font-weight: 700;
  font-size: 0.8125rem;
  padding: 2px 8px;
  border-radius: 3px;
  color: #fff;
}

.api-endpoint__method--post {
  background: var(--color-success);
}

.api-endpoint__method--get {
  background: var(--color-primary);
}

/* ========================================
   17. Page — Blog
   ======================================== */

.blog-list {
  padding: var(--space-2xl) 0;
}

.blog-list__header {
  margin-bottom: var(--space-2xl);
}

.blog-list__header h1 {
  margin-bottom: var(--space-sm);
}

.blog-list__posts {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.blog-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: box-shadow 0.15s;
}

.blog-card:hover {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
}

.blog-card__meta {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-sm);
  font-size: 0.875rem;
  color: var(--color-muted);
}

.blog-card__title {
  font-size: 1.25rem;
  margin-bottom: var(--space-sm);
}

.blog-card__title a {
  color: var(--color-text);
  text-decoration: none;
}

.blog-card__title a:hover {
  color: var(--color-primary);
}

.blog-card__summary {
  color: var(--color-muted);
  font-size: 0.9375rem;
}

.blog-post {
  padding: var(--space-2xl) 0;
}

.blog-post__header {
  margin-bottom: var(--space-2xl);
}

.blog-post__meta {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  color: var(--color-muted);
  font-size: 0.9375rem;
  margin-bottom: var(--space-md);
}

.blog-post__tags {
  display: flex;
  gap: var(--space-sm);
}

.blog-post__content {
  margin-bottom: var(--space-3xl);
}

.blog-post__cta {
  text-align: center;
  padding: var(--space-2xl);
  background: var(--color-surface);
  border-radius: var(--radius-lg);
}

.blog-post__cta h3 {
  margin-top: 0;
  margin-bottom: var(--space-sm);
}

.blog-post__cta p {
  color: var(--color-muted);
  margin-bottom: var(--space-md);
}

/* ========================================
   18. Page — About
   ======================================== */

.about {
  padding: var(--space-2xl) 0;
}

.about h1 {
  margin-bottom: var(--space-lg);
}

.about h2 {
  margin-top: var(--space-2xl);
}

/* ========================================
   19. Page — Generic
   ======================================== */

.page {
  padding: var(--space-2xl) 0;
}

/* ========================================
   20. Footer
   ======================================== */

.site-footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-2xl) 0;
  margin-top: var(--space-3xl);
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--space-2xl);
  margin-bottom: var(--space-xl);
}

.footer__tagline {
  color: var(--color-muted);
  font-size: 0.9375rem;
  margin-top: var(--space-sm);
}

.footer__heading {
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-muted);
  margin-bottom: var(--space-md);
}

.footer__nav {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.footer__nav a {
  color: var(--color-text);
  font-size: 0.9375rem;
  text-decoration: none;
}

.footer__nav a:hover {
  color: var(--color-primary);
}

.footer__bottom {
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-lg);
  color: var(--color-muted);
  font-size: 0.875rem;
}

/* ========================================
   21. Responsive
   ======================================== */

@media (max-width: 768px) {
  h1 { font-size: 1.75rem; }
  h2 { font-size: 1.375rem; }

  .nav__toggle { display: flex; }

  .nav__links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    padding: var(--space-lg);
    gap: var(--space-md);
  }

  .nav__links--open { display: flex; }

  .hero { padding: var(--space-2xl) 0; }
  .hero__actions { flex-direction: column; align-items: center; }

  .features__grid,
  .how-it-works__steps {
    grid-template-columns: 1fr;
  }

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

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

  .docs-toc {
    position: static;
    border-right: none;
    border-bottom: 1px solid var(--color-border);
    padding-right: 0;
    padding-bottom: var(--space-md);
    max-height: none;
  }

  .footer__grid {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }

  .grid-2, .grid-3 {
    grid-template-columns: 1fr;
  }
}