:root {
  color-scheme: dark;
  --color-bg-deep: #070a10;
  --color-bg: #080b12;
  --color-bg-raised: #0c111b;
  --color-surface: #101722;
  --color-surface-raised: #141e2b;
  --color-border: #222c3a;
  --color-border-strong: #314252;
  --color-text: #edf4f6;
  --color-text-secondary: #a7b3bd;
  --color-text-muted: #91a0ad;
  --color-primary: #62f5e1;
  --color-secondary: #a98bfa;
  --color-accent: #f366b7;
  --color-positive: #d3f36b;
  --color-info: #79baff;
  --rgb-cyan: 98, 245, 225;
  --rgb-purple: 169, 139, 250;
  --rgb-magenta: 243, 102, 183;
  --rgb-positive: 211, 243, 107;
  --rgb-neutral: 145, 160, 173;
  --ink: var(--color-bg);
  --ink-soft: var(--color-bg-raised);
  --surface: var(--color-surface);
  --line: var(--color-border);
  --line-bright: var(--color-border-strong);
  --text: var(--color-text);
  --muted: var(--color-text-muted);
  --cyan: var(--color-primary);
  --purple: var(--color-secondary);
  --magenta: var(--color-accent);
  --lime: var(--color-positive);
  --font-size-xs: 0.6875rem;
  --font-size-sm: 0.8125rem;
  --font-size-md: 1rem;
  --font-size-lg: 1.25rem;
  --font-size-xl: 2rem;
  --font-size-section: 2.6875rem;
  --font-size-card-title: 1.0625rem;
  --font-size-about-title: 2.375rem;
  --font-size-display: 4.75rem;
  --line-height-body: 1.6;
  --line-height-heading: 1.12;
  --font-display: "Space Grotesk", "Avenir Next", sans-serif;
  --font-mono: "DM Mono", "Consolas", monospace;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-6: 24px;
  --space-8: 32px;
  --radius-control: 2px;
  --radius-card: 2px;
  --border-default: 1px solid var(--color-border);
  --glow-primary: 0 0 18px rgba(var(--rgb-cyan), 0.22);
  --glow-secondary: 0 0 18px rgba(var(--rgb-purple), 0.2);
  --shadow-panel: 0 28px 80px rgba(0, 0, 0, 0.22);
  --motion-fast: 150ms;
  --motion-normal: 180ms;
  --motion-enter: 260ms;
  --ease-ui: ease;
  --shell: 1160px;
  --page-background-image: linear-gradient(rgba(105, 132, 155, 0.035) 1px, transparent 1px), linear-gradient(90deg, rgba(105, 132, 155, 0.035) 1px, transparent 1px), radial-gradient(ellipse at 82% 17%, rgba(19, 84, 83, 0.13), transparent 34rem);
  --header-background: rgba(8, 11, 18, 0.86);
  --panel-background: linear-gradient(145deg, rgba(17, 26, 37, 0.96), rgba(11, 16, 25, 0.95));
  --card-background: rgba(13, 19, 28, 0.55);
  --card-hover-background: #111b26;
  --input-background: rgba(10, 15, 23, 0.74);
  --option-background: rgba(8, 11, 18, 0.45);
  --section-background: linear-gradient(100deg, rgba(14, 23, 31, 0.96), rgba(11, 16, 25, 0.9));
}

/* Reusable interface components */
.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  padding: 0 var(--space-4);
  border: 1px solid transparent;
  border-radius: var(--radius-control);
  cursor: pointer;
  font-size: var(--font-size-sm);
  font-weight: 600;
  text-decoration: none;
  transition: transform var(--motion-fast) var(--ease-ui), box-shadow var(--motion-fast) var(--ease-ui), background var(--motion-fast) var(--ease-ui), color var(--motion-fast) var(--ease-ui), border-color var(--motion-fast) var(--ease-ui);
}

.button-primary {
  color: var(--color-bg);
  background: var(--color-primary);
}

.button-primary:hover {
  transform: translateY(-2px);
  background: #8dffef;
  box-shadow: var(--glow-primary);
}

.button-secondary {
  border-color: var(--color-secondary);
  color: var(--color-secondary);
  background: rgba(var(--rgb-purple), 0.06);
}

.button-secondary:hover {
  background: rgba(var(--rgb-purple), 0.13);
  box-shadow: var(--glow-secondary);
}

.button-quiet {
  border-color: var(--color-border-strong);
  color: var(--color-text);
  background: transparent;
}

.button-quiet:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: rgba(var(--rgb-cyan), 0.05);
}

.input-shell,
.form-control {
  min-height: 40px;
  border: var(--border-default);
  border-radius: var(--radius-control);
  color: var(--color-text);
  background: var(--input-background);
  transition: border-color var(--motion-fast) var(--ease-ui), box-shadow var(--motion-fast) var(--ease-ui);
}

.input-shell:focus-within,
.form-control:focus-visible {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 2px rgba(var(--rgb-cyan), 0.1);
}

.form-control {
  width: 100%;
  padding: 0 var(--space-3);
  font: inherit;
}

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

.surface-panel {
  border: var(--border-default);
  border-radius: var(--radius-card);
  background: var(--panel-background);
  box-shadow: var(--shadow-panel);
}

.surface-card {
  border: var(--border-default);
  border-radius: var(--radius-card);
  background: var(--card-background);
  transition: background var(--motion-normal) var(--ease-ui), box-shadow var(--motion-normal) var(--ease-ui), border-color var(--motion-normal) var(--ease-ui);
}

.nav-link {
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color var(--motion-fast) var(--ease-ui);
}

.nav-link:hover,
.nav-link[aria-current="page"] {
  color: var(--color-primary);
}

.loading-indicator {
  display: inline-block;
  width: 20px;
  aspect-ratio: 1;
  border: 2px solid rgba(var(--rgb-cyan), 0.22);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 800ms linear infinite;
}

.skeleton {
  color: transparent;
  background: linear-gradient(100deg, var(--color-surface) 30%, var(--color-surface-raised) 50%, var(--color-surface) 70%);
  background-size: 220% 100%;
  animation: skeleton-shimmer 1.4s ease-in-out infinite;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
}

body {
  min-width: 320px;
  margin: 0;
  color: var(--text);
  background-color: var(--ink);
  background-image: var(--page-background-image);
  background-size: 40px 40px, 40px 40px, auto;
  font-family: var(--font-display);
  font-size: var(--font-size-md);
  line-height: var(--line-height-body);
}

::selection {
  color: var(--ink);
  background: var(--cyan);
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input {
  font: inherit;
}

button:focus-visible,
a:focus-visible,
input:focus-visible {
  outline: 2px solid var(--color-positive);
  outline-offset: 4px;
}

.visually-hidden,
.skip-link:not(:focus) {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  clip-path: inset(50%);
  border: 0;
}

.skip-link:focus {
  position: fixed;
  z-index: 20;
  top: 12px;
  left: 12px;
  padding: 10px 14px;
  color: var(--ink);
  background: var(--cyan);
}

.page-shell,
.section-shell {
  width: min(var(--shell), calc(100% - 64px));
  margin-inline: auto;
}

.site-header {
  position: relative;
  z-index: 2;
  border-bottom: 1px solid rgba(145, 160, 173, 0.14);
  background: var(--header-background);
  backdrop-filter: blur(16px);
}

.header-inner {
  display: flex;
  width: min(1280px, calc(100% - 64px));
  height: 76px;
  align-items: center;
  justify-content: space-between;
  margin-inline: auto;
}

.header-controls {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.theme-toggle,
.mobile-nav-toggle {
  display: inline-flex;
  min-height: 38px;
  align-items: center;
  justify-content: center;
  gap: 7px;
  padding: 0 10px;
  border: var(--border-default);
  border-radius: var(--radius-control);
  color: var(--color-text-secondary);
  background: transparent;
  cursor: pointer;
  font-size: var(--font-size-xs);
  transition: color var(--motion-fast) var(--ease-ui), border-color var(--motion-fast) var(--ease-ui), background var(--motion-fast) var(--ease-ui);
}

.theme-toggle:hover,
.mobile-nav-toggle:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: rgba(var(--rgb-cyan), 0.05);
}

.theme-glyph {
  color: var(--color-accent);
  font-size: var(--font-size-md);
  line-height: 1;
}

.mobile-nav-toggle {
  display: none;
}

.menu-glyph {
  display: grid;
  width: 15px;
  gap: 4px;
}

.menu-glyph i {
  display: block;
  height: 1px;
  background: currentColor;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.brand-divider {
  color: var(--color-primary);
}

.brand-mark {
  display: grid;
  width: 21px;
  height: 21px;
  grid-template: repeat(2, 1fr) / repeat(2, 1fr);
  gap: 3px;
  transform: rotate(-8deg);
}

.brand-mark span {
  border: 1px solid var(--cyan);
}

.brand-mark span:nth-child(2) {
  background: var(--cyan);
  box-shadow: 0 0 12px rgba(98, 245, 225, 0.4);
}

.brand-mark span:nth-child(3) {
  border-color: var(--magenta);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 38px;
  margin-left: 68px;
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
}

.main-nav a,
.text-link,
.back-to-top {
  transition: color var(--motion-fast) var(--ease-ui);
}

.main-nav a:hover,
.text-link:hover,
.back-to-top:hover {
  color: var(--color-primary);
}

.header-action {
  display: inline-flex;
  min-height: 38px;
  align-items: center;
  gap: 18px;
  padding: 0 14px;
  border: var(--border-default);
  border-color: var(--color-border-strong);
  color: var(--text);
  font-size: 12px;
  transition: border-color var(--motion-fast) var(--ease-ui), color var(--motion-fast) var(--ease-ui), background var(--motion-fast) var(--ease-ui);
}

.header-action span {
  color: var(--cyan);
}

.header-action:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: rgba(var(--rgb-cyan), 0.05);
}

.hero {
  position: relative;
  display: grid;
  min-height: 608px;
  grid-template-columns: 1fr 0.84fr;
  align-items: center;
  gap: 7%;
  padding-block: 74px 88px;
  animation: rise-in 650ms ease both;
}

.hero-copy {
  padding-block: 10px;
}

.eyebrow,
.mono-label,
.hero-note,
.signal-bottom,
.about-footnote,
.footer-copyright,
.results-status {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 23px;
  color: var(--color-primary);
}

.status-dot {
  display: inline-block;
  width: 7px;
  height: 7px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--color-positive);
  box-shadow: 0 0 11px rgba(var(--rgb-positive), 0.75);
}

.status-dot--primary {
  background: var(--color-primary);
  box-shadow: 0 0 11px rgba(var(--rgb-cyan), 0.65);
}

.status-dot--accent {
  background: var(--color-accent);
  box-shadow: 0 0 10px rgba(var(--rgb-magenta), 0.58);
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 23px;
  font-size: var(--font-size-display);
  font-weight: 600;
  letter-spacing: -0.055em;
  line-height: 0.98;
}

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

.hero-description {
  max-width: 430px;
  margin-bottom: 29px;
  color: var(--color-text-secondary);
  font-size: 15px;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 25px;
}

.text-link {
  color: #c1ccd3;
  font-size: 12px;
}

.text-link span {
  margin-left: 5px;
  color: var(--magenta);
}

.hero-note {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 52px;
  color: #74828e;
  font-size: 9px;
}

.note-rule {
  width: 25px;
  height: 1px;
  background: var(--magenta);
}

.signal-panel {
  position: relative;
  min-height: 330px;
  padding: 24px 25px 19px;
  overflow: hidden;
  border-color: var(--color-border-strong);
  box-shadow: var(--shadow-panel), inset 0 1px rgba(255, 255, 255, 0.035);
}

.signal-panel::before {
  position: absolute;
  top: 0;
  right: 0;
  width: 41%;
  height: 1px;
  background: var(--cyan);
  content: "";
  box-shadow: 0 0 18px rgba(var(--rgb-cyan), 0.55);
}

.panel-topline,
.live-state,
.signal-heading,
.signal-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.mono-label {
  color: #c3ced4;
  font-size: 9px;
}

.live-state {
  gap: 8px;
  color: var(--color-positive);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.08em;
}

.live-state .status-dot {
  width: 6px;
  height: 6px;
}

.signal-heading {
  min-height: 135px;
  padding-top: 19px;
}

.muted-label {
  margin-bottom: 5px;
  color: #83929e;
}

.signal-number {
  margin-bottom: 0;
  font-size: 49px;
  font-weight: 500;
  letter-spacing: -0.06em;
  line-height: 1;
}

.signal-number span {
  color: #92a2ad;
  font-size: 13px;
  letter-spacing: 0;
}

.signal-orbit {
  position: relative;
  display: grid;
  width: 78px;
  height: 78px;
  place-items: center;
  border: 1px solid rgba(98, 245, 225, 0.29);
  border-radius: 50%;
}

.signal-orbit::before,
.signal-orbit::after {
  position: absolute;
  border: 1px solid rgba(98, 245, 225, 0.12);
  border-radius: 50%;
  content: "";
}

.signal-orbit::before {
  inset: 9px;
}

.signal-orbit::after {
  inset: -8px 13px;
  transform: rotate(42deg);
}

.signal-orbit span {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--color-primary);
  box-shadow: 0 0 24px rgba(var(--rgb-cyan), 0.64);
}

.signal-orbit i {
  position: absolute;
  top: 5px;
  right: 9px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--magenta);
  box-shadow: 0 0 10px rgba(243, 102, 183, 0.7);
}

.signal-graph {
  display: flex;
  height: 74px;
  align-items: end;
  gap: 5px;
  padding: 12px 0 9px;
  border-top: 1px solid rgba(145, 160, 173, 0.14);
  border-bottom: 1px solid rgba(145, 160, 173, 0.14);
  background: repeating-linear-gradient(to bottom, transparent 0, transparent 17px, rgba(145, 160, 173, 0.08) 18px);
}

.signal-graph span {
  width: 100%;
  height: var(--bar-height);
  background: linear-gradient(to top, rgba(var(--rgb-cyan), 0.16), rgba(var(--rgb-cyan), 0.75));
  transform-origin: bottom;
  animation: bar-rise 700ms cubic-bezier(0.2, 0.7, 0.3, 1) both;
}

.signal-graph span:nth-child(3n) {
  background: linear-gradient(to top, rgba(var(--rgb-magenta), 0.1), rgba(var(--rgb-magenta), 0.68));
}

.signal-graph span:nth-child(3n + 1) {
  animation-delay: 80ms;
}

.signal-bottom {
  padding-top: 15px;
  color: #82909b;
  font-size: 8px;
}

.signal-coordinate {
  color: #bbc7ce;
}

.signal-coordinate span {
  color: var(--magenta);
}

.hero-index {
  position: absolute;
  right: 0;
  bottom: 30px;
  color: #667580;
  font-size: 9px;
}

.directory {
  padding-block: 83px 106px;
  border-top: 1px solid rgba(145, 160, 173, 0.16);
}

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 25px;
  margin-bottom: 38px;
}

.section-eyebrow span,
.about-label .eyebrow span {
  color: var(--color-accent);
}

h2 {
  margin-bottom: 0;
  font-size: var(--font-size-section);
  font-weight: 500;
  letter-spacing: -0.045em;
  line-height: var(--line-height-heading);
}

.section-intro {
  margin-bottom: 4px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.75;
}

.directory-controls {
  display: flex;
  min-height: 54px;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.filter-list {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
}

.filter-button {
  display: inline-flex;
  min-height: 36px;
  align-items: center;
  gap: 10px;
  padding: 0 12px;
  border: 1px solid transparent;
  color: var(--color-text-secondary);
  background: transparent;
  cursor: pointer;
  font-size: 11px;
  transition: border-color 150ms ease, color 150ms ease, background 150ms ease;
}

.filter-button span {
  color: #6f7e89;
  font-family: var(--font-mono);
  font-size: 9px;
}

.filter-button:hover {
  color: var(--text);
}

.filter-button.is-active {
  border-color: rgba(var(--rgb-cyan), 0.34);
  color: var(--color-primary);
  background: rgba(var(--rgb-cyan), 0.06);
}

.filter-button.is-active span {
  color: var(--color-primary);
}

.search-box {
  display: flex;
  width: 230px;
  min-height: 38px;
  align-items: center;
  gap: 10px;
  padding: 0 10px;
}

.search-box:focus-within {
  border-color: var(--color-primary);
}

.search-icon {
  position: relative;
  width: 12px;
  height: 12px;
  flex: 0 0 auto;
  border: 1.5px solid #83929d;
  border-radius: 50%;
}

.search-icon::after {
  position: absolute;
  right: -4px;
  bottom: -3px;
  width: 5px;
  height: 1.5px;
  background: #83929d;
  content: "";
  transform: rotate(48deg);
}

.search-box input {
  width: 100%;
  min-width: 0;
  border: 0;
  outline: 0;
  color: var(--text);
  background: transparent;
  font-size: 11px;
}

.search-box input::placeholder {
  color: #71808c;
}

.search-box kbd {
  color: #72818b;
  font-family: var(--font-mono);
  font-size: 13px;
}

.results-status {
  min-height: 30px;
  margin: 19px 0 8px;
  color: #778691;
  font-size: 9px;
  letter-spacing: 0.04em;
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.tool-card {
  position: relative;
  display: flex;
  min-height: 220px;
  flex-direction: column;
  padding: 19px 18px 17px;
  border-top: 0;
  border-left: 0;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  animation: card-in 260ms ease both;
}

.tool-card::before {
  position: absolute;
  top: -1px;
  left: 18px;
  width: 28px;
  height: 1px;
  background: var(--accent-color, var(--cyan));
  content: "";
  transition: width 180ms ease, box-shadow 180ms ease;
}

.tool-card:hover {
  z-index: 1;
  background: var(--card-hover-background);
  box-shadow: inset 0 0 28px rgba(var(--rgb-cyan), 0.035);
}

.tool-card:hover::before {
  width: calc(100% - 36px);
  box-shadow: 0 0 12px color-mix(in srgb, var(--accent-color, var(--cyan)) 55%, transparent);
}

.tool-card[data-category="technology"] {
  --accent-color: var(--color-accent);
}

.tool-card[data-category="everyday"] {
  --accent-color: var(--color-positive);
}

.tool-card-top,
.tool-card-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.tool-favorite {
  display: grid;
  width: 28px;
  height: 28px;
  flex: 0 0 auto;
  place-items: center;
  padding: 0;
  border: 1px solid transparent;
  border-radius: var(--radius-control);
  color: var(--color-text-muted);
  background: transparent;
  cursor: pointer;
  font-size: 19px;
  line-height: 1;
  transition: color var(--motion-fast) var(--ease-ui), border-color var(--motion-fast) var(--ease-ui), background var(--motion-fast) var(--ease-ui);
}

.tool-favorite:hover,
.tool-favorite[aria-pressed="true"] {
  border-color: rgba(var(--rgb-magenta), 0.32);
  color: var(--color-accent);
  background: rgba(var(--rgb-magenta), 0.07);
}

.tool-card-top .tool-category {
  margin-left: auto;
  margin-right: var(--space-2);
}

.tool-number,
.tool-category,
.tool-card-bottom {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.06em;
}

.tool-number {
  color: #81909b;
}

.tool-category {
  color: var(--accent-color, var(--cyan));
  text-transform: uppercase;
}

.tool-card h3 {
  max-width: 220px;
  margin: 27px 0 9px;
  font-size: var(--font-size-card-title);
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.35;
}

.tool-card p {
  max-width: 250px;
  margin-bottom: 22px;
  color: #92a0ab;
  font-size: 11px;
  line-height: 1.7;
}

.tool-card-bottom {
  margin-top: auto;
  padding-top: 11px;
  border-top: 1px solid rgba(145, 160, 173, 0.13);
  color: #74838e;
}

.development-status {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.development-status::before {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent-color, var(--cyan));
  content: "";
}

.tool-arrow {
  color: #a8b5bd;
  font-size: 14px;
}

a.tool-arrow {
  display: grid;
  width: 28px;
  height: 28px;
  place-items: center;
  border: 1px solid transparent;
  transition: color var(--motion-fast) var(--ease-ui), border-color var(--motion-fast) var(--ease-ui), background var(--motion-fast) var(--ease-ui);
}

a.tool-arrow:hover {
  border-color: rgba(var(--rgb-cyan), 0.34);
  color: var(--color-primary);
  background: rgba(var(--rgb-cyan), 0.06);
}

.recent-tools {
  padding: 22px 0 8px;
  border-bottom: 1px solid var(--color-border);
}

.recent-tools-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  margin-bottom: 12px;
}

.recent-tools-heading .mono-label {
  margin-bottom: 2px;
  color: var(--color-accent);
  font-size: 8px;
}

.recent-tools-heading h3 {
  margin: 0;
  font-size: var(--font-size-sm);
  font-weight: 500;
}

.text-button {
  padding: 5px 0;
  border: 0;
  color: var(--color-text-muted);
  background: transparent;
  cursor: pointer;
  font-size: var(--font-size-xs);
  text-decoration: underline;
  text-decoration-color: transparent;
  text-underline-offset: 3px;
  transition: color var(--motion-fast) var(--ease-ui), text-decoration-color var(--motion-fast) var(--ease-ui);
}

.text-button:hover {
  color: var(--color-primary);
  text-decoration-color: currentColor;
}

.recent-tool-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.recent-tool-link {
  display: inline-flex;
  min-height: 38px;
  align-items: center;
  gap: var(--space-3);
  padding: 0 11px;
  border: var(--border-default);
  color: var(--color-text);
  background: var(--card-background);
  font-size: var(--font-size-xs);
  transition: border-color var(--motion-fast) var(--ease-ui), color var(--motion-fast) var(--ease-ui), background var(--motion-fast) var(--ease-ui);
}

.recent-tool-link:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--card-hover-background);
}

.recent-tool-category {
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 8px;
  text-transform: uppercase;
}

.empty-state {
  padding: 50px 20px;
  border: 1px solid var(--line);
  border-top: 0;
  text-align: center;
}

.empty-state .mono-label {
  color: var(--magenta);
}

.empty-state p:last-child {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 13px;
}

.empty-reset {
  min-height: 38px;
  margin-top: 6px;
  font-size: var(--font-size-xs);
}

.about-section {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--section-background);
}

.about-inner {
  display: grid;
  grid-template-columns: 0.7fr 1.3fr;
  gap: 10%;
  padding-block: 80px 84px;
}

.about-label .eyebrow {
  margin-bottom: 40px;
}

.about-mark {
  color: rgba(145, 160, 173, 0.32);
  font-size: 51px;
  font-weight: 600;
  letter-spacing: -0.07em;
}

.about-mark span {
  color: var(--color-accent);
}

.about-copy h2 {
  margin-bottom: 20px;
  font-size: var(--font-size-about-title);
}

.about-copy > p:not(.about-footnote) {
  max-width: 590px;
  margin-bottom: 14px;
  color: #9cabb5;
  font-size: 13px;
  line-height: 1.85;
}

.about-footnote {
  display: flex;
  align-items: center;
  gap: 9px;
  margin: 25px 0 0;
  color: #7e8d98;
  font-size: 8px;
}

.about-footnote .status-dot {
  width: 6px;
  height: 6px;
  background: var(--color-accent);
  box-shadow: 0 0 10px rgba(var(--rgb-magenta), 0.58);
}

.site-footer {
  background: var(--color-bg-deep);
}

.footer-inner {
  display: flex;
  min-height: 94px;
  align-items: center;
  gap: 27px;
}

.footer-brand {
  font-size: 12px;
}

.footer-brand .brand-mark {
  width: 17px;
  height: 17px;
  gap: 2px;
}

.footer-inner > p {
  margin: 0 auto 0 0;
  color: #788791;
  font-size: 11px;
}

.back-to-top {
  color: #b4c0c8;
  font-size: 11px;
}

.back-to-top span {
  margin-left: 7px;
  color: var(--color-primary);
}

.footer-copyright {
  color: #73818b;
  font-size: 8px;
}

@keyframes rise-in {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes bar-rise {
  from { transform: scaleY(0); }
  to { transform: scaleY(1); }
}

@keyframes card-in {
  from { opacity: 0.55; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

@keyframes skeleton-shimmer {
  to { background-position: -220% 0; }
}

/* Layout breakpoints: compact desktop 900px, mobile 640px, narrow mobile 380px. */
@media (max-width: 900px) {
  .hero {
    min-height: 560px;
    grid-template-columns: 1fr 0.82fr;
    gap: 5%;
  }

  h1 {
    font-size: 64px;
  }

  .signal-panel {
    min-height: 300px;
    padding-inline: 18px;
  }

  .tool-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .tool-card {
    min-height: 205px;
  }
}

@media (max-width: 640px) {
  html {
    scroll-padding-top: 70px;
  }

  .page-shell,
  .section-shell,
  .header-inner {
    width: calc(100% - 40px);
  }

  .header-inner {
    height: 66px;
  }

  .brand {
    gap: 8px;
    font-size: 12px;
  }

  .brand-mark {
    width: 18px;
    height: 18px;
    gap: 2px;
  }

  .main-nav {
    gap: 15px;
    margin-left: auto;
    margin-right: 15px;
    font-size: 11px;
  }

  .header-action {
    display: none;
  }

  .hero {
    min-height: auto;
    grid-template-columns: 1fr;
    gap: 42px;
    padding-block: 67px 62px;
  }

  h1 {
    font-size: 60px;
  }

  .hero-description {
    max-width: 390px;
    font-size: 14px;
  }

  .hero-note {
    margin-top: 34px;
  }

  .signal-panel {
    width: 100%;
    min-height: 286px;
  }

  .hero-index {
    bottom: 25px;
  }

  .directory {
    padding-block: 62px 72px;
  }

  .section-heading {
    display: block;
    margin-bottom: 26px;
  }

  h2 {
    font-size: 37px;
  }

  .section-intro {
    margin-top: 14px;
  }

  .directory-controls {
    align-items: stretch;
    flex-direction: column-reverse;
    gap: 13px;
    padding-bottom: 13px;
  }

  .search-box {
    width: 100%;
  }

  .filter-list {
    gap: 2px;
  }

  .filter-button {
    min-height: 34px;
    gap: 7px;
    padding-inline: 9px;
    font-size: 10px;
  }

  .tool-card {
    min-height: 210px;
    padding-inline: 13px;
  }

  .tool-card::before {
    left: 13px;
  }

  .tool-card:hover::before {
    width: calc(100% - 26px);
  }

  .tool-card h3 {
    margin-top: 24px;
    font-size: 15px;
  }

  .tool-card p {
    font-size: 10px;
  }

  .tool-category,
  .tool-number,
  .tool-card-bottom {
    font-size: 8px;
  }

  .about-inner {
    grid-template-columns: 1fr;
    gap: 22px;
    padding-block: 58px 62px;
  }

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

  .about-label .eyebrow {
    margin: 0;
  }

  .about-mark {
    font-size: 34px;
  }

  .about-copy h2 {
    font-size: 34px;
  }

  .footer-inner {
    min-height: 120px;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 12px 18px;
    padding-block: 20px;
  }

  .footer-inner > p {
    width: calc(100% - 160px);
    text-align: right;
  }

  .footer-copyright {
    margin-left: auto;
  }
}

@media (max-width: 380px) {
  .page-shell,
  .section-shell,
  .header-inner {
    width: calc(100% - 32px);
  }

  .main-nav {
    gap: 10px;
    margin-right: 0;
    font-size: 10px;
  }

  h1 {
    font-size: 53px;
  }

  .hero-actions {
    gap: 15px;
  }

  .button {
    gap: 13px;
    padding-inline: 12px;
    font-size: 12px;
  }

  .text-link {
    font-size: 11px;
  }

  .filter-button {
    gap: 5px;
    padding-inline: 7px;
    font-size: 9px;
  }

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

  .tool-card {
    min-height: 190px;
    padding-inline: 17px;
  }

  .tool-card::before {
    left: 17px;
  }

  .tool-card:hover::before {
    width: calc(100% - 34px);
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

:root[data-theme="light"] {
  color-scheme: light;
  --color-bg-deep: #e5edf2;
  --color-bg: #f3f8fa;
  --color-bg-raised: #e7eff3;
  --color-surface: #ffffff;
  --color-surface-raised: #e7f2f4;
  --color-border: #c8d6de;
  --color-border-strong: #91a8b4;
  --color-text: #15252f;
  --color-text-secondary: #435b68;
  --color-text-muted: #526975;
  --color-primary: #00787f;
  --color-secondary: #6942b8;
  --color-accent: #b72b70;
  --color-positive: #4b7418;
  --color-info: #245e9f;
  --rgb-cyan: 0, 121, 127;
  --rgb-purple: 105, 66, 184;
  --rgb-magenta: 183, 43, 112;
  --rgb-positive: 75, 116, 24;
  --rgb-neutral: 77, 104, 119;
  --page-background-image: linear-gradient(rgba(77, 104, 119, 0.06) 1px, transparent 1px), linear-gradient(90deg, rgba(77, 104, 119, 0.06) 1px, transparent 1px), radial-gradient(ellipse at 82% 17%, rgba(0, 127, 135, 0.11), transparent 34rem);
  --header-background: rgba(243, 248, 250, 0.92);
  --panel-background: linear-gradient(145deg, #ffffff, #f1f7f9);
  --card-background: rgba(255, 255, 255, 0.86);
  --card-hover-background: #e7f2f4;
  --input-background: rgba(255, 255, 255, 0.92);
  --option-background: rgba(231, 239, 243, 0.74);
  --section-background: linear-gradient(100deg, #e8f1f4, #f5f9fa);
  --shadow-panel: 0 20px 50px rgba(27, 56, 68, 0.1);
  --glow-primary: 0 0 18px rgba(var(--rgb-cyan), 0.12);
  --glow-secondary: 0 0 18px rgba(var(--rgb-purple), 0.12);
}

:root[data-theme="light"] .button-primary:hover {
  color: var(--color-text);
}

:root[data-theme="light"] .mono-label,
:root[data-theme="light"] .signal-coordinate,
:root[data-theme="light"] .hero-index,
:root[data-theme="light"] .results-status,
:root[data-theme="light"] .tool-number,
:root[data-theme="light"] .tool-card-bottom,
:root[data-theme="light"] .footer-inner > p,
:root[data-theme="light"] .back-to-top,
:root[data-theme="light"] .footer-copyright {
  color: var(--color-text-secondary);
}

:root[data-theme="light"] .tool-card p,
:root[data-theme="light"] .tool-arrow {
  color: var(--color-text-secondary);
}

:root[data-theme="light"] .text-link {
  color: var(--color-text-secondary);
}

:root[data-theme="light"] .hero-note,
:root[data-theme="light"] .signal-number span,
:root[data-theme="light"] .signal-bottom,
:root[data-theme="light"] .search-box input::placeholder,
:root[data-theme="light"] .search-box kbd,
:root[data-theme="light"] .filter-button:not(.is-active) span {
  color: var(--color-text-secondary);
}

@media (max-width: 760px) {
  .header-inner {
    position: relative;
  }

  .header-action {
    display: none;
  }

  .header-controls {
    margin-left: auto;
  }

  .mobile-nav-toggle {
    display: inline-flex;
  }

  .main-nav {
    position: absolute;
    z-index: 4;
    top: calc(100% + 1px);
    right: 0;
    left: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    margin: 0;
    padding: var(--space-2);
    border: var(--border-default);
    background: var(--panel-background);
    box-shadow: var(--shadow-panel);
  }

  .main-nav.is-open {
    display: flex;
  }

  .main-nav .nav-link {
    padding: 12px var(--space-3);
    border-bottom: 1px solid var(--color-border);
  }

  .main-nav .nav-link:last-child {
    border-bottom: 0;
  }
}

@media (max-width: 380px) {
  .theme-toggle [data-theme-label] {
    display: none;
  }
}

@view-transition {
  navigation: auto;
}

@media (prefers-reduced-motion: no-preference) {
  ::view-transition-old(root) {
    animation: platform-fade-out 120ms ease both;
  }

  ::view-transition-new(root) {
    animation: platform-fade-in 180ms ease both;
  }
}

@keyframes platform-fade-out {
  to { opacity: 0; }
}

@keyframes platform-fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}