/* ══════════════════════════════════════════════════════════════════
   Shared Design Language — Layout
   Page chrome (header, footer), containers, sections, hero,
   page content prose, layout variants, TOC sidebar, responsive.
   ══════════════════════════════════════════════════════════════════ */

/* ── Header / Navigation ──────────────────────────────────────── */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-default);
  transition: box-shadow var(--duration-normal) var(--ease-default);
}

.site-header.scrolled {
  box-shadow: 0 1px 3px rgba(28, 26, 24, 0.06);
}

.header-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 var(--space-6);
  height: 56px;
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  font-weight: 700;
  font-size: 1rem;
  color: var(--text-heading);
  white-space: nowrap;
  letter-spacing: -0.01em;
}

.brand:hover {
  color: var(--text-heading);
}

.brand-text {
  color: var(--gray-900);
}

.nav-divider {
  width: 1px;
  height: 20px;
  background: var(--border-strong);
  flex-shrink: 0;
}

.nav-products {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  list-style: none;
}

.nav-products a {
  font-size: 1rem;
  font-weight: 400;
  color: var(--gray-400);
  text-decoration: none;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  transition:
    color var(--duration-fast),
    background var(--duration-fast);
}

.nav-products a:hover {
  color: var(--text-heading);
  background: var(--bg-hover);
}

.nav-products a.active {
  font-weight: 700;
  color: var(--text-heading);
}

.nav-spacer {
  margin-left: auto;
}

.nav-secondary a {
  font-weight: 500;
  color: var(--gray-400);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  padding: var(--space-2);
  cursor: pointer;
  color: var(--gray-700);
}

.nav-toggle svg {
  width: 24px;
  height: 24px;
}

/* ── Containers ────────────────────────────────────────────────── */

.page-container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.content-product {
  max-width: 720px;
}

.content-product p:has(> img) {
  margin: 0;
  line-height: 0;
}

.content-product img {
  width: 56px;
  height: 56px;
  border-radius: 0;
  margin-bottom: var(--space-4);
}

.content-product p:has(> img) + h3 {
  margin-top: 0;
}

/* ── Page Content ──────────────────────────────────────────────── */

.page-content {
  max-width: 680px;
  min-width: 0;
  margin: 0 auto;
  padding: calc(56px + var(--space-12)) var(--space-6) var(--space-12);
  overflow-wrap: break-word;
}

.page-content ul,
.page-content ol {
  margin-bottom: var(--space-4);
  padding-left: var(--space-6);
}

.page-content li {
  margin-bottom: var(--space-2);
}

.page-content li > p {
  margin-bottom: var(--space-2);
}

.page-content blockquote {
  border-left: 3px solid var(--accent-warm-200);
  background: var(--accent-warm-50);
  padding: var(--space-4) var(--space-6);
  margin: var(--space-6) 0;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--gray-500);
}

.page-content blockquote p:last-child {
  margin-bottom: 0;
}

.page-content hr {
  border: none;
  height: 1px;
  background: var(--border-default);
  margin: var(--space-12) 0;
}

.page-content img {
  border-radius: var(--radius-md);
  margin: var(--space-6) 0;
}

.page-content table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-6) 0;
  font-size: var(--text-small-size);
  display: block;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-content th {
  text-align: left;
  font-weight: 600;
  color: var(--gray-700);
  border-bottom: 2px solid var(--gray-200);
  padding: var(--space-3) var(--space-4);
}

.page-content td {
  border-bottom: 1px solid var(--border-default);
  padding: var(--space-3) var(--space-4);
  color: var(--gray-500);
}

/* ── Layout Variants ───────────────────────────────────────────── */

.layout-home .page-content {
  max-width: none;
  padding-top: 0;
}

.layout-product .page-content {
  max-width: 720px;
}

.layout-product:has(> .hero) .page-content {
  padding-top: var(--space-12);
}

.layout-product .page-content > blockquote {
  background: var(--accent-warm-50);
  border: 1.5px solid var(--accent-warm-200);
  border-left: 1.5px solid var(--accent-warm-200);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  margin: var(--space-8) 0;
}

.layout-product .page-content > blockquote p {
  color: var(--gray-700);
  font-size: 1.125rem;
  line-height: 1.65;
}

.layout-product .page-content ul {
  list-style: none;
  padding: 0;
  margin: var(--space-6) 0;
}

.layout-product .page-content ul li {
  position: relative;
  padding-left: 1.75em;
  margin-bottom: var(--space-3);
  line-height: 1.5;
}

.layout-product .page-content ul li::before {
  content: "\2713";
  position: absolute;
  left: 0;
  color: var(--gray-700);
  font-weight: bold;
}

/* ── Hero ──────────────────────────────────────────────────────── */

.hero {
  padding-top: calc(56px + var(--space-24));
  padding-bottom: var(--space-16);
  text-align: center;
}

.hero-illustration {
  max-width: 400px;
  margin: 0 auto var(--space-8);
  animation: fadeUp 500ms var(--ease-default);
}

.hero-illustration img {
  width: 100%;
  height: auto;
}

.hero .text-hero {
  margin-top: 0;
  margin-bottom: var(--space-4);
  animation: fadeUp 500ms var(--ease-default) 100ms backwards;
}

.hero .text-subtitle {
  margin: 0 auto var(--space-8);
  animation: fadeUp 500ms var(--ease-default) 200ms backwards;
}

.hero-cta {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
  flex-wrap: wrap;
  animation: fadeUp 500ms var(--ease-default) 300ms backwards;
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ── Sections ──────────────────────────────────────────────────── */

.section {
  padding: var(--space-16) 0;
}

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

/* ── TOC Sidebar ───────────────────────────────────────────────── */

.with-toc {
  display: grid;
  grid-template-columns: 1fr 220px;
  gap: var(--space-12);
  align-items: start;
  max-width: 960px;
  margin: 0 auto;
  padding: calc(56px + var(--space-12)) var(--space-6) var(--space-12);
}

.with-toc > .page-content {
  max-width: none;
  min-width: 0;
  margin: 0;
  padding: 0;
}

@media (min-width: 961px) {
  .with-toc > .page-content {
    order: -1;
  }
}

.toc-nav {
  position: sticky;
  top: 80px;
  max-height: calc(100vh - 100px);
  overflow-y: auto;
  padding: var(--space-4);
  background: var(--bg-warm);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-default);
}

.toc-nav h5 {
  margin: 0 0 var(--space-3);
  color: var(--gray-700);
  font-size: var(--text-badge-size);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.toc-nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.toc-nav ul ul {
  padding-left: var(--space-3);
}

.toc-nav li {
  margin-bottom: var(--space-1);
}

.toc-nav a {
  font-size: var(--text-small-size);
  color: var(--gray-400);
  text-decoration: none;
  display: block;
  padding: 2px 0;
  transition: color var(--duration-fast);
}

.toc-nav a:hover {
  color: var(--gray-700);
}

/* ── Footer (Dark) ─────────────────────────────────────────────── */

.site-footer {
  background: var(--bg-inverted);
  margin-top: var(--space-16);
  padding: var(--space-12) 0;
}

.footer-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 var(--space-6);
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  align-items: center;
}

.footer-column {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer-column-left {
  align-items: flex-start;
}

.footer-column-right {
  align-items: flex-end;
}

.footer-heading {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 0.9375rem;
  color: var(--text-on-dark);
}

.footer-column a {
  color: var(--gray-300);
  font-size: var(--text-small-size);
  text-decoration-color: var(--gray-500);
}

.footer-column a:hover {
  text-decoration-color: var(--gray-300);
}

.footer-social {
  display: flex;
  flex-direction: row;
  justify-content: center;
  align-items: center;
  gap: var(--space-4);
}

.footer-social a {
  display: inline-flex;
  opacity: 0.7;
  transition: opacity var(--duration-fast) var(--ease-default);
}

.footer-social a:hover {
  opacity: 1;
}

.footer-social img {
  width: 24px;
  height: 24px;
  display: block;
}

/* ── Responsive ────────────────────────────────────────────────── */

@media (max-width: 960px) {
  .grid:has(.product-card) {
    grid-template-columns: repeat(2, 1fr);
  }

  .with-toc {
    grid-template-columns: 1fr;
  }

  .toc-nav {
    position: static;
    max-height: none;
  }
}

@media (max-width: 768px) {
  .header-inner {
    padding: 0 var(--space-4);
  }

  .nav-products,
  .nav-divider {
    display: none;
  }

  .nav-toggle {
    display: flex;
    margin-left: auto;
  }

  .nav-toggle svg {
    overflow: visible;
  }

  .nav-toggle svg line {
    transition:
      transform var(--duration-normal) var(--ease-default),
      opacity var(--duration-normal) var(--ease-default);
    transform-origin: 12px 12px;
  }

  .site-header.menu-open .nav-toggle svg line:first-child {
    transform: rotate(45deg) translateY(6px);
  }

  .site-header.menu-open .nav-toggle svg line:nth-child(2) {
    opacity: 0;
  }

  .site-header.menu-open .nav-toggle svg line:last-child {
    transform: rotate(-45deg) translateY(-6px);
  }

  body.menu-open {
    overflow: hidden;
  }

  .site-header.menu-open {
    position: fixed;
    inset: 0;
    background: var(--bg-page);
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    border-bottom: none;
  }

  .site-header.menu-open .brand,
  .site-header.menu-open .nav-toggle {
    position: relative;
    z-index: 10;
  }

  .site-header.menu-open .nav-divider {
    display: none;
  }

  .site-header.menu-open .nav-products {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: absolute;
    inset: 0;
    padding-top: 56px;
    padding-bottom: var(--space-4);
    gap: var(--space-1);
    list-style: none;
  }

  .site-header.menu-open .nav-products .nav-spacer {
    display: none;
  }

  .site-header.menu-open .nav-products a {
    font-size: clamp(1.5rem, 5.5vh, 2.5rem);
    font-weight: 400;
    font-family: var(--font-display);
    color: var(--text-heading);
    padding: var(--space-1) var(--space-4);
    background: none;
    border-radius: 0;
  }

  .site-header.menu-open .nav-products a:hover {
    color: var(--text-primary);
    background: none;
  }

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

  .hero {
    padding-top: calc(56px + var(--space-16));
    padding-bottom: var(--space-12);
  }

  .hero-illustration {
    max-width: 280px;
  }

  .page-container {
    padding: 0 var(--space-4);
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: var(--space-4);
    text-align: center;
  }

  .footer-column {
    align-items: center;
  }
}