@import url("https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600&display=swap");

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  transition-property:
    color, background-color, background-image, border-color, box-shadow,
    scrollbar-color;
  transition-duration: var(--transition-theme);
  transition-timing-function: ease;
}

:root {
  --color-primary: oklch(55% 0.13 185);
  --color-primary-hover: oklch(48% 0.15 185);
  --color-primary-light: oklch(55% 0.13 185 / 0.08);
  --color-primary-glow: oklch(55% 0.13 185 / 0.2);
  --color-text: oklch(18% 0.012 250);
  --color-text-secondary: oklch(54% 0.012 250);
  --color-text-muted: oklch(70% 0.008 250);
  --color-bg: oklch(99% 0.002 240);
  --color-bg-secondary: oklch(100% 0 0);
  --color-border: oklch(92% 0.005 250);
  --color-success: oklch(48% 0.09 150);
  --color-error: oklch(48% 0.14 30);
  --color-warning: oklch(60% 0.11 80);
  --font-sans:
    "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui,
    sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", "Fira Code", monospace;
  --font-display:
    "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui,
    sans-serif;
  --space-4: 4px;
  --space-6: 6px;
  --space-8: 8px;
  --space-10: 10px;
  --space-12: 12px;
  --space-16: 16px;
  --space-20: 20px;
  --space-24: 24px;
  --space-28: 28px;
  --space-32: 32px;
  --space-40: 40px;
  --space-48: 48px;
  --space-56: 56px;
  --space-64: 64px;
  --space-80: 80px;

  /* Semantic spacing aliases */
  --space-stack-xs: var(--space-4);
  --space-stack-sm: var(--space-8);
  --space-stack: var(--space-16);
  --space-stack-md: var(--space-24);
  --space-stack-lg: var(--space-32);
  --space-section: var(--space-48);
  --space-section-lg: var(--space-64);
  --space-section-xl: var(--space-80);
  --space-card-pad: var(--space-16);
  --space-card-pad-lg: var(--space-24);
  --text-10: clamp(0.625rem, 0.5938rem + 0.16vw, 0.75rem);
  --text-11: clamp(0.6875rem, 0.6563rem + 0.16vw, 0.8125rem);
  --text-12: clamp(0.75rem, 0.7031rem + 0.23vw, 0.875rem);
  --text-13: clamp(0.8125rem, 0.7656rem + 0.23vw, 0.9375rem);
  --text-14: clamp(0.875rem, 0.8281rem + 0.23vw, 1rem);
  --text-15: clamp(0.90625rem, 0.8438rem + 0.31vw, 1.0625rem);
  --text-16: clamp(0.9375rem, 0.875rem + 0.31vw, 1.125rem);
  --text-18: clamp(1rem, 0.9219rem + 0.39vw, 1.25rem);
  --text-20: clamp(1.0625rem, 0.9531rem + 0.55vw, 1.375rem);
  --text-22: clamp(1.125rem, 0.9844rem + 0.7vw, 1.5rem);
  --text-24: clamp(1.25rem, 1.0781rem + 0.86vw, 1.75rem);
  --text-28: clamp(1.375rem, 1.1406rem + 1.17vw, 2rem);
  --text-32: clamp(1.5rem, 1.1563rem + 1.72vw, 2.5rem);
  --text-36: clamp(1.625rem, 1.1563rem + 2.34vw, 2.875rem);
  --text-40: clamp(1.75rem, 1.1406rem + 3.05vw, 3.25rem);
  --text-48: clamp(2rem, 1.1563rem + 4.22vw, 4rem);
  --text-56: clamp(2.25rem, 1.0938rem + 5.78vw, 5rem);
  --text-64: clamp(2.5rem, 1.0313rem + 7.34vw, 6rem);

  /* Semantic text aliases */
  --text-hero: var(--text-64);
  --text-h1: var(--text-36);
  --text-h2: var(--text-28);
  --text-h3: var(--text-22);
  --text-body: var(--text-16);
  --text-body-sm: var(--text-14);
  --text-small: var(--text-12);
  --text-label: var(--text-11);

  --prose-size: var(--text-body-sm);
  --prose-leading: 1.75;
  --radius-none: 0;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-full: 999px;
  --shadow-sm: 0 1px 2px color-mix(in srgb, var(--color-text) 5%, transparent);
  --shadow-md: 0 4px 8px color-mix(in srgb, var(--color-text) 6%, transparent);
  --shadow-lg: 0 8px 16px color-mix(in srgb, var(--color-text) 8%, transparent);
  --border-1: 1px;
  --border-2: 2px;
  --transition-theme: 0.25s;
  --transition-fast: 0.15s;
  --transition-press: 0.05s;
}

[data-theme="dark"] {
  --color-primary: oklch(70% 0.13 185);
  --color-primary-hover: oklch(74% 0.13 185);
  --color-primary-light: oklch(70% 0.13 185 / 0.15);
  --color-primary-glow: oklch(70% 0.13 185 / 0.25);
  --color-text: oklch(93% 0.005 250);
  --color-text-secondary: oklch(64% 0.008 250);
  --color-text-muted: oklch(50% 0.01 250);
  --color-bg: oklch(16% 0.006 250);
  --color-bg-secondary: oklch(20% 0.008 250);
  --color-border: oklch(28% 0.008 250);
  --color-success: oklch(60% 0.09 150);
  --color-error: oklch(60% 0.14 30);
  --color-warning: oklch(72% 0.11 80);
}

/* ── Language-specific typography ── */
:lang(zh),
:lang(ja) {
  --text-13: clamp(0.875rem, 0.8281rem + 0.23vw, 1rem);
  --text-14: clamp(0.9375rem, 0.8906rem + 0.23vw, 1.0625rem);
  --text-16: clamp(1rem, 0.9375rem + 0.31vw, 1.1875rem);
}

:lang(th) {
  --text-13: clamp(0.90625rem, 0.8594rem + 0.23vw, 1.03125rem);
  --text-14: clamp(0.96875rem, 0.9219rem + 0.23vw, 1.09375rem);
  --text-16: clamp(1.0625rem, 1rem + 0.31vw, 1.25rem);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.page-content {
  max-width: 1100px;
  margin: 0 auto;
  padding: var(--space-40) var(--space-24) var(--space-32);
  min-height: 60vh;
}

@media (max-width: 768px) {
  .page-content {
    padding: var(--space-24) var(--space-16) var(--space-24);
  }
}

html {
  -webkit-text-size-adjust: 100%;
  font-size: 16px;
  scroll-behavior: smooth;
  scrollbar-gutter: stable;
  scrollbar-color: var(--color-text-muted) transparent;
}
/* WebKit scrollbar */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--color-text-muted);
  border-radius: 4px;
}
::-webkit-scrollbar-corner {
  background: transparent;
}
textarea::-webkit-resizer {
  border: none;
}
::selection {
  background: var(--color-primary);
  color: white;
}
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}
.sb-search:focus-visible,
.sb-search-wrap:focus-visible {
  outline: none;
}
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition-duration: 0s !important;
    animation-duration: 0s !important;
  }
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-16);
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  position: relative;
  z-index: 0;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-variant-numeric: tabular-nums;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-display);
  letter-spacing: -0.02em;
}

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

a:hover {
  text-decoration: underline;
}

img {
  max-width: 100%;
  height: auto;
}

.site-footer {
  margin-top: var(--space-64);
  padding-top: var(--space-20);
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-16);
  flex-wrap: wrap;
}

.footer-text {
  color: var(--color-text-muted);
  font-size: var(--text-12);
}

.footer-nav {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  justify-content: center;
}

.footer-link {
  color: var(--color-text-muted);
  font-size: var(--text-12);
  text-decoration: none;
  white-space: nowrap;
}

.footer-link:hover {
  color: var(--color-text-secondary);
}

.footer-sep {
  margin-inline: var(--space-8);
  color: var(--color-text-muted);
}

/* Back to top */
.back-to-top {
  position: fixed;
  bottom: var(--space-24);
  right: var(--space-24);
  z-index: 50;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--color-bg-secondary);
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition-property:
    opacity, visibility, transform, background-color, border-color, color,
    box-shadow;
  transition-duration: var(--transition-theme);
  transition-timing-function: ease;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.back-to-top:active {
  transform: translateY(0);
}

.back-to-top svg {
  width: 18px;
  height: 18px;
}

/* Legal page — flex row + sticky TOC */
.legal-layout {
  display: flex;
  gap: var(--space-48);
  align-items: flex-start;
}

.legal-main {
  flex: 1;
  min-width: 0;
}

/* --- shared toc item styles --- */
.toc-header {
  font-size: var(--text-12);
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-8);
}

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

.toc-item {
  border-left: 2px solid transparent;
}

.toc-item a {
  display: block;
  padding: var(--space-4) 0 var(--space-4) var(--space-16);
  font-size: var(--text-14);
  color: var(--color-text-muted);
  text-decoration: none;
}

.toc-item a:hover {
  color: var(--color-text);
}

.toc-level-3 a {
  padding-left: calc(var(--space-16) + var(--space-8));
  font-size: var(--text-12);
  color: var(--color-text-muted);
}

.toc-level-3 a:hover {
  color: var(--color-text);
}

/* active state → added by scrollspy JS on desktop */
.toc-item--active {
  border-left-color: var(--color-primary);
}

.toc-item--active a {
  color: var(--color-text);
  font-weight: 500;
}

.toc-level-3.toc-item--active a {
  color: var(--color-text-secondary);
}

/* --- sticky sidebar --- */
.toc-sidebar {
  width: 220px;
  flex-shrink: 0;
}

.toc-sticky {
  position: sticky;
  top: calc(52px + 32px);
  padding-top: var(--space-4);
}

@media (max-width: 768px) {
  .toc-sidebar {
    display: none;
  }
}

.tool-article {
  margin: 0 auto;
}

.sec-h-cat {
  display: inline-flex;
  align-items: center;
  gap: var(--space-4);
  color: inherit;
  text-decoration: none;
  white-space: nowrap;
}
.sec-h-cat:hover {
  color: var(--color-text-secondary);
  text-decoration: underline;
}

.tool-interactive {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  border-radius: var(--radius-lg);
  padding: var(--space-24);
  margin-bottom: var(--space-48);
}
@media (max-width: 768px) {
  .tool-interactive {
    padding: var(--space-16);
  }
}

.prose {
  font-size: var(--prose-size);
  line-height: var(--prose-leading);
}

.prose h1 {
  font-size: var(--text-h1);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: var(--space-24);
  text-wrap: balance;
}

.prose h2 {
  font-size: var(--text-h2);
  font-weight: 700;
  margin-top: var(--space-48);
  margin-bottom: var(--space-16);
  text-wrap: balance;
  scroll-margin-top: 80px;
}

.prose h3 {
  font-size: var(--text-h3);
  font-weight: 600;
  margin-top: var(--space-32);
  margin-bottom: var(--space-8);
  text-wrap: balance;
  scroll-margin-top: 80px;
}

.prose h4 {
  font-size: var(--text-20);
  font-weight: 600;
  margin-top: var(--space-24);
  margin-bottom: var(--space-8);
  text-wrap: balance;
  scroll-margin-top: 80px;
}

@media (max-width: 768px) {
  .prose h1 {
    font-size: var(--text-h2);
  }
  .prose h2 {
    font-size: var(--text-h3);
  }
  .prose h3 {
    font-size: var(--text-20);
  }
  .prose h4 {
    font-size: var(--text-18);
  }
}

.prose p {
  margin-bottom: var(--space-16);
}

.prose ul,
.prose ol {
  margin-bottom: var(--space-16);
  padding-left: 1.5em;
}

.prose li {
  margin-bottom: var(--space-4);
}

.prose strong {
  font-weight: 600;
}

.prose a {
  text-decoration: underline;
  text-underline-offset: 2px;
}

.prose a:hover {
  opacity: 0.85;
}

.prose blockquote {
  border-left: 3px solid var(--color-border);
  padding-left: var(--space-24);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-16);
}

.prose code {
  font-size: 0.875em;
  background: var(--color-bg-secondary);
  padding: 0.125em 0.375em;
  border-radius: var(--radius-sm);
}

.prose table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-14);
}

.table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin-bottom: var(--space-16);
}

.prose th,
.prose td {
  border: 1px solid var(--color-border);
  padding: var(--space-8) var(--space-16);
  text-align: left;
  vertical-align: top;
}

.prose th {
  background: var(--color-bg-secondary);
  font-weight: 600;
}

.prose thead th {
  border-bottom-width: 2px;
}

.prose-note {
  padding: var(--space-16) var(--space-20);
  background: var(--color-primary-light);
  border-left: 3px solid var(--color-primary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin-bottom: var(--space-16);
  font-size: var(--text-14);
  line-height: 1.6;
}

.prose-warning {
  padding: var(--space-16) var(--space-20);
  background: color-mix(in srgb, var(--color-warning) 10%, transparent);
  border-left: 3px solid var(--color-warning);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin-bottom: var(--space-16);
  font-size: var(--text-14);
  line-height: 1.6;
}

.eyebrow-dot {
  width: 0.5em;
  height: 0.5em;
  border-radius: 50%;
  flex-shrink: 0;
}

/* ─── Tools page ─── */
.page-header {
  margin-bottom: var(--space-32);
}
.page-eyebrow {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  font-size: var(--text-13);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-8);
}
.page-title {
  font-size: var(--text-h1);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: var(--space-4);
  text-wrap: balance;
}
.page-sub {
  font-size: var(--text-18);
  color: var(--color-text-secondary);
  line-height: 1.5;
}
@media (max-width: 768px) {
  .page-title {
    font-size: var(--text-h2);
  }
}

.tools-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-16);
}
@media (min-width: 480px) {
  .tools-grid {
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  }
}

.tool-layout {
  display: flex;
  gap: var(--space-48);
  align-items: flex-start;
}
.tool-main {
  flex: 1;
  min-width: 0;
}
.tool-features-list {
  list-style: disc;
  padding-left: 1.5em;
  margin-bottom: var(--space-16);
}

.tool-features-list li {
  margin-bottom: var(--space-8);
  line-height: 1.5;
}

.tool-faq {
  margin-bottom: var(--space-48);
}

.tool-faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-8);
  overflow: hidden;
}

.tool-faq-question {
  padding: var(--space-16);
  font-weight: 600;
  cursor: pointer;
  user-select: none;
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

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

.tool-faq-question::before {
  content: "+";
  font-size: var(--text-18);
  font-weight: 700;
  color: var(--color-primary);
  flex-shrink: 0;
}

.tool-faq-item[open] .tool-faq-question::before {
  content: "−";
}

.tool-faq-question:hover {
  background: var(--color-bg-secondary);
}

.tool-faq-answer {
  padding: 0 var(--space-16) var(--space-16);
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.tool-related {
  margin-top: var(--space-48);
}

.tool-related-placeholder {
  color: var(--color-text-secondary);
}

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

/* ─── Home: Entry ─── */
.entry {
  padding: 0 0 var(--space-32);
  text-align: center;
}
.entry-tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-6);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-primary);
  margin-bottom: var(--space-16);
}
.entry-tag::before,
.entry-tag::after {
  content: "";
  display: block;
  width: 24px;
  height: 1px;
  background: var(--color-border);
}
.entry h1 {
  font-size: var(--text-40);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: var(--space-12);
}
.entry p {
  font-size: var(--text-16);
  color: var(--color-text-secondary);
  max-width: 480px;
  margin: 0 auto 28px;
  line-height: 1.5;
}
.search-bar {
  position: relative;
  width: 100%;
  max-width: 480px;
  margin: 0 auto;
  transition-property: transform;
  transition-duration: var(--transition-fast);
}
.search-bar:focus-within {
  transform: scale(1.02);
}
.search-bar-icon {
  position: absolute;
  left: var(--space-16);
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-muted);
  pointer-events: none;
  width: 20px;
  height: 20px;
}
.search-bar input {
  width: 100%;
  height: 52px;
  padding: 0 60px 0 var(--space-48);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg-secondary);
  font-family: var(--font-sans);
  font-size: 1rem;
  color: var(--color-text);
  outline: none;
}
.search-bar-kbd {
  position: absolute;
  right: 14px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 0.625rem;
  font-weight: 500;
  padding: 2px 6px;
  border-radius: 4px;
  background: var(--color-bg);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  line-height: 1.4;
  pointer-events: none;
}
.search-bar input::placeholder {
  color: var(--color-text-muted);
}
.search-bar input:hover {
  border-color: var(--color-primary);
  color: var(--color-text-secondary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}
.search-bar input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}
.entry-quick {
  display: flex;
  justify-content: center;
  gap: var(--space-20);
  margin-top: var(--space-20);
}
.entry-quick a {
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: var(--space-6);
}
.entry-quick a:hover {
  color: var(--color-primary);
}

/* ─── Category chips ─── */
.categories {
  display: flex;
  gap: var(--space-8);
  flex-wrap: wrap;
  margin-bottom: var(--space-40);
}
.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  text-decoration: none;
  cursor: pointer;
  background: transparent;
  font-family: var(--font-sans);
}
.chip:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-primary-light);
  text-decoration: none;
}
.chip--active {
  background: var(--color-primary-light);
  border-color: var(--color-primary);
  color: var(--color-primary);
  font-weight: 600;
}
.chip-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  flex-shrink: 0;
}

/* ─── Section header ─── */
.sec-h {
  display: flex;
  align-items: center;
  gap: var(--space-16);
  margin-bottom: var(--space-20);
  flex-wrap: wrap;
}
.sec-h h1,
.sec-h h2 {
  font-size: var(--text-20);
  font-weight: 700;
  letter-spacing: -0.02em;
}
.sec-h-line {
  flex: 1;
  height: 1px;
  background: var(--color-border);
}
.sec-h-meta {
  font-size: var(--text-13);
  font-weight: 500;
  color: var(--color-text-muted);
  white-space: nowrap;
}
.sec-h-action {
  font-size: var(--text-13);
  font-weight: 500;
  color: var(--color-primary);
  text-decoration: none;
  white-space: nowrap;
  transition: opacity var(--transition-fast);
  margin-left: auto;
}
.sec-h-action:hover {
  opacity: 0.7;
  text-decoration: none;
}
.sec-h--wrapped .sec-h-line {
  visibility: hidden;
}

/* ─── Tool card header (dot + category row) ─── */
.tool-card-header {
  display: flex;
  align-items: baseline;
  gap: var(--space-8);
  margin-bottom: var(--space-8);
}
.tool-card-cat {
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
  line-height: 1;
}

/* ─── Home: Responsive ─── */
@media (max-width: 768px) {
  .entry {
    padding: 0 0 var(--space-24);
  }
  .entry h1 {
    font-size: var(--text-28);
  }
  .entry-tag::before,
  .entry-tag::after {
    display: none;
  }
  .entry-quick {
    gap: var(--space-12);
    flex-wrap: wrap;
  }
  .entry-quick a {
    font-size: 0.8125rem;
  }
}

/* ── Site header (topnav) ── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--color-bg) 75%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
}
.site-header--scrolled {
  border-bottom-color: var(--color-border);
}
.site-header--menu-open {
  border-bottom-color: var(--color-border);
}
.site-header--menu-open .header-inner {
  background: var(--color-bg);
}
.header-inner {
  display: flex;
  align-items: center;
  gap: var(--space-32);
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 var(--space-24);
  height: 52px;
}
.header-logo {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--color-text);
  text-decoration: none;
  flex-shrink: 0;
  letter-spacing: -0.02em;
}
.header-logo:hover {
  text-decoration: none;
}
.logo-accent {
  color: var(--color-primary);
}
.header-nav-wrap {
  display: flex;
  align-items: center;
  flex: 1;
}
.header-nav {
  display: flex;
  gap: var(--space-24);
}
.header-nav-link {
  font-size: var(--text-14);
  font-weight: 500;
  color: var(--color-text-secondary);
  padding: var(--space-4) 0;
  text-decoration: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
}
.header-nav-link:hover {
  color: var(--color-text);
  text-decoration: none;
}
.header-nav-link--active {
  color: var(--color-text);
  border-bottom-color: var(--color-primary);
}
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  flex-shrink: 0;
  margin-left: auto;
}

/* ── Search trigger (pill) ── */
.search-trigger {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  padding: var(--space-6) var(--space-12);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg-secondary);
  color: var(--color-text-muted);
  font-size: 0.8125rem;
  cursor: pointer;
  height: 34px;
  font-family: var(--font-sans);
  white-space: nowrap;
}
.search-trigger:hover {
  border-color: var(--color-primary);
  color: var(--color-text-secondary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}
.search-trigger svg {
  width: 16px;
  height: 16px;
  color: var(--color-text-muted);
  flex-shrink: 0;
}
.search-trigger span {
  color: var(--color-text-muted);
  font-size: 0.75rem;
}
.search-trigger kbd {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  font-weight: 500;
  padding: 1px 5px;
  border-radius: 3px;
  background: var(--color-bg);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  line-height: 1.4;
}

/* ── Language switcher ── */
.lang-switcher {
  position: relative;
}
.lang-btn {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  cursor: pointer;
  border: none;
  background: transparent;
  padding: var(--space-4) var(--space-8);
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  height: 36px;
}
.lang-btn:hover {
  color: var(--color-primary);
  background: var(--color-primary-light);
}
.lang-switcher-dropdown {
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: 4px;
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  list-style: none;
  padding: var(--space-4);
  min-width: 120px;
  opacity: 0;
  pointer-events: none;
  transform: translateY(-4px);
  transition:
    opacity var(--transition-fast),
    transform var(--transition-fast);
  z-index: 60;
}
.lang-switcher-dropdown--open {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}
.lang-switcher-option {
  display: block;
  padding: var(--space-4) var(--space-12);
  font-size: var(--text-13);
  color: var(--color-text-secondary);
  text-decoration: none;
  border-radius: var(--radius-sm);
}
.lang-switcher-option:hover {
  background: color-mix(in srgb, var(--color-text) 4%, transparent);
  color: var(--color-text);
  text-decoration: none;
}
.lang-switcher-option--active {
  color: var(--color-primary);
  font-weight: 600;
}

/* ── Language slide-down (mobile, same as mobile-nav) ── */
.lang-slide {
  display: none;
  position: fixed;
  top: 52px;
  left: 0;
  right: 0;
  z-index: 49;
  flex-direction: column;
  padding: 0 var(--space-24);
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  opacity: 0;
  transform: translateY(-100%);
  pointer-events: none;
  max-height: calc(100vh - 52px);
  overflow-y: auto;
  transition:
    transform var(--transition-theme) cubic-bezier(0.4, 0, 0.2, 1),
    opacity 0.2s;
}
.lang-slide--open {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}
.lang-slide-option {
  display: block;
  padding: 14px 0;
  font-size: var(--text-15);
  font-weight: 500;
  color: var(--color-text-secondary);
  text-decoration: none;
  border-bottom: 1px solid var(--color-border);
}
.lang-slide-option:last-child {
  border-bottom: none;
}
.lang-slide-option:hover {
  color: var(--color-text);
  text-decoration: none;
}
.lang-slide-option--active {
  color: var(--color-primary);
}

.header-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--color-text-secondary);
  cursor: pointer;
}
.header-btn:hover {
  background: var(--color-primary-light);
  color: var(--color-primary);
}
.header-btn svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.header-hamburger {
  display: none;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--color-text-secondary);
  cursor: pointer;
  padding: 0;
}
.header-hamburger:hover {
  background: var(--color-primary-light);
  color: var(--color-primary);
}
.header-hamburger svg {
  width: 20px;
  height: 20px;
}

.mobile-nav {
  position: fixed;
  top: 52px;
  left: 0;
  right: 0;
  z-index: 49;
  flex-direction: column;
  padding: 0 var(--space-24);
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  opacity: 0;
  transform: translateY(-100%);
  pointer-events: none;
  transition:
    transform var(--transition-theme) cubic-bezier(0.4, 0, 0.2, 1),
    opacity 0.2s;
}
.mobile-nav--open {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}
.mobile-nav-link {
  display: block;
  padding: 14px 0;
  font-size: var(--text-15);
  font-weight: 500;
  color: var(--color-text-secondary);
  text-decoration: none;
  border-bottom: 1px solid var(--color-border);
}
.mobile-nav-link:last-child {
  border-bottom: none;
}
.mobile-nav-link:hover {
  color: var(--color-text);
  text-decoration: none;
}
.mobile-nav-link--active {
  color: var(--color-primary);
}

.mobile-overlay {
  position: fixed;
  top: 52px;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 48;
  background: rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(2px);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-fast);
}
.mobile-overlay--open {
  opacity: 1;
  pointer-events: auto;
}
.body-menu-open {
  overflow: hidden;
}

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

@media (max-width: 768px) {
  .header-nav-wrap {
    display: none;
  }
  .header-hamburger {
    display: flex;
  }
  .header-inner {
    gap: var(--space-16);
    padding: 0 var(--space-16);
  }
  .search-overlay {
    padding: 60px var(--space-12) 0;
  }
  .search-overlay-panel {
    max-width: 100%;
  }
  .site-footer {
    flex-direction: column;
    align-items: center;
    gap: var(--space-8);
  }
  .search-trigger {
    padding: 6px 8px;
  }
  .search-trigger kbd {
    display: none;
  }
  .search-trigger span {
    display: none;
  }
  .search-trigger svg {
    width: 18px;
    height: 18px;
  }
  .lang-switcher-dropdown {
    display: none;
  }
  .lang-slide {
    display: flex;
  }
}

/* ── Button system ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-8);
  font-family: var(--font-sans);
  font-weight: 500;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  text-decoration: none;
  line-height: 1;
  white-space: nowrap;
  user-select: none;
}
.btn:active {
  transform: scale(0.97);
}
.btn-sm {
  font-size: var(--text-12);
  padding: var(--space-4) var(--space-12);
  height: 28px;
}
.btn-md {
  font-size: var(--text-14);
  padding: var(--space-8) var(--space-20);
  height: 36px;
}
.btn-lg {
  font-size: var(--text-16);
  padding: var(--space-12) var(--space-28);
  height: 44px;
}
.btn-primary {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}
.btn-primary:hover {
  background: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
}
.btn-ghost {
  background: transparent;
  color: var(--color-text-secondary);
  border-color: var(--color-border);
}
.btn-ghost:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}
.btn-icon {
  width: 32px;
  height: 32px;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  color: var(--color-text-secondary);
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
}
.btn-icon:hover {
  background: color-mix(in srgb, var(--color-text) 4%, transparent);
  color: var(--color-text);
}
.btn-icon svg {
  width: 18px;
  height: 18px;
}

/* ── Form inputs ── */
.input,
.textarea,
.select {
  width: 100%;
  font-family: var(--font-sans);
  font-size: var(--text-14);
  color: var(--color-text);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  outline: none;
}
.input,
.select {
  padding: var(--space-8) var(--space-12);
  height: 40px;
}
.textarea {
  padding: var(--space-12);
  resize: vertical;
  line-height: 1.6;
}
.input:focus,
.textarea:focus,
.select:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}
.input::placeholder,
.textarea::placeholder {
  color: var(--color-text-muted);
}

/* ── Tool card refinements ── */
.tool-card {
  display: block;
  padding: var(--space-20);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-bg-secondary);
  text-decoration: none;
  color: inherit;
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}
.tool-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--card-color, var(--color-border));
  transition-property: background-color;
  transition-duration: var(--transition-theme);
}
.tool-card:hover {
  border-color: var(--card-color, var(--color-primary));
  transform: translateY(-3px);
  box-shadow:
    0 8px 24px color-mix(in srgb, var(--color-text) 6%, transparent),
    0 2px 4px color-mix(in srgb, var(--color-text) 3%, transparent);
  text-decoration: none;
}
.tool-card:active {
  transform: translateY(-1px);
  transition-duration: var(--transition-press);
}
.tool-card-title {
  font-size: var(--text-18);
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: -0.01em;
  display: flex;
  align-items: center;
  gap: var(--space-8);
}
.tool-card-description {
  font-size: var(--text-12);
  color: var(--color-text-secondary);
  line-height: 1.55;
  margin-top: var(--space-8);
  display: -webkit-box;
  line-clamp: 2;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.tool-card-tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-6);
  margin-top: var(--space-12);
  font-size: var(--text-12);
  font-weight: 500;
  color: var(--color-text-secondary);
  letter-spacing: 0.04em;
}
.tool-card-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: inline-block;
  flex-shrink: 0;
}
.tool-card-badge {
  display: inline-block;
  font-size: var(--text-12);
  font-weight: 500;
  color: var(--color-text-secondary);
  background: color-mix(in srgb, var(--color-text-secondary) 8%, transparent);
  padding: 2px 10px;
  border-radius: var(--radius-full);
  white-space: nowrap;
  margin-top: var(--space-12);
}

/* ─── Tool card: Responsive ─── */
@media (max-width: 768px) {
  .tool-card {
    padding: var(--space-16);
  }
}

/* ── Category card (distinct from tool card) ── */
.category-card {
  display: block;
  padding: var(--space-20);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-bg-secondary);
  text-decoration: none;
  color: inherit;
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
  transition: all var(--transition-theme);
}
.category-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--card-color, var(--color-border));
  transition-property: background-color;
  transition-duration: var(--transition-theme);
}
.category-card:hover {
  border-color: var(--card-color, var(--color-primary));
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
  text-decoration: none;
}
.category-card-header {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  margin-bottom: var(--space-8);
}
.category-card-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}
.category-card-title {
  font-size: var(--text-18);
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: -0.01em;
}
.category-card-count {
  display: inline-block;
  font-size: var(--text-11);
  font-weight: 500;
  color: var(--color-text-secondary);
  background: color-mix(in srgb, var(--color-text-secondary) 8%, transparent);
  padding: 2px 10px;
  border-radius: var(--radius-full);
  white-space: nowrap;
  margin-top: var(--space-12);
}

/* ─── Category card: Responsive ─── */
@media (max-width: 768px) {
  .category-card {
    padding: var(--space-16);
  }
}

/* ── Search overlay polish ── */
.search-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 120px var(--space-16) 0;
  visibility: hidden;
  opacity: 0;
  background: color-mix(in srgb, rgb(0 0 0) 50%, transparent);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  will-change: transform;
  transform: translateZ(0);
  transition:
    opacity var(--transition-fast),
    visibility 0s var(--transition-fast);
}
.search-overlay--open {
  visibility: visible;
  opacity: 1;
  transition:
    opacity var(--transition-fast),
    visibility 0s;
}
.search-overlay-panel {
  width: 100%;
  max-width: 540px;
  background: var(--surface, var(--color-bg-secondary));
  border: 1px solid var(--color-border);
  border-radius: 12px;
  box-shadow: 0 16px 48px color-mix(in srgb, rgb(0 0 0) 25%, transparent);
  overflow: hidden;
  transform: translateY(-12px) scale(0.98);
  opacity: 0;
  will-change: transform, opacity;
  transition:
    transform var(--transition-theme) cubic-bezier(0.16, 1, 0.3, 1),
    opacity 0.2s ease;
}
.search-overlay--open .search-overlay-panel {
  transform: translateY(0) scale(1);
  opacity: 1;
}
.search-overlay-input {
  display: flex;
  align-items: center;
  gap: var(--space-12);
  padding: var(--space-16) var(--space-20);
  border-bottom: 1px solid var(--color-border);
}
.search-overlay-input svg {
  width: 20px;
  height: 20px;
  color: var(--color-text-muted);
  flex-shrink: 0;
}
.search-overlay-input input {
  flex: 1;
  border: none;
  background: transparent;
  font-size: 1rem;
  color: var(--color-text);
  outline: none;
  font-family: var(--font-sans);
}
.search-overlay-input input::placeholder {
  color: var(--color-text-muted);
}
.search-overlay-hint {
  font-size: 0.6875rem;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  padding: 2px 6px;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  background: var(--color-bg);
}
.search-overlay-results {
  max-height: 320px;
  overflow-y: auto;
  padding: var(--space-6);
}
.search-overlay-empty {
  padding: var(--space-32) var(--space-20);
  text-align: center;
  color: var(--color-text-muted);
  font-size: var(--text-14);
}
.search-overlay-group {
  padding: var(--space-6) 0;
}
.search-overlay-group + .search-overlay-group {
  border-top: 1px solid var(--color-border);
}
.search-overlay-group-label {
  font-size: var(--text-11);
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: var(--space-6) var(--space-10) var(--space-2);
}
.search-result-item {
  display: flex;
  align-items: center;
  gap: var(--space-12);
  padding: 10px 14px;
  color: var(--color-text);
  text-decoration: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
}
.search-result-item:hover,
.search-result-highlight {
  background: var(--color-primary-light);
  text-decoration: none;
}
.search-result-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}
.search-result-info {
  flex: 1;
  min-width: 0;
}
.search-result-title {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text);
}
.search-result-cat {
  font-size: 0.6875rem;
  color: var(--color-text-muted);
  margin-top: 2px;
}

.sec-hdr {
  display: flex;
  align-items: center;
  gap: var(--space-16);
  margin-bottom: var(--space-24);
}
.sec-hdr-label {
  font-size: var(--text-12);
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  white-space: nowrap;
}
.sec-hdr-rule {
  flex: 1;
  height: 1px;
  background: var(--color-border);
}

.categories-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-16);
}

@media (min-width: 480px) {
  .categories-grid {
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  }
}

.title {
  text-wrap: balance;
}