:root {
  --bg-1: #f4f8fb;
  --bg-2: #eef7f2;
  --surface: #ffffff;
  --surface-alt: #f8fbfe;
  --text: #122230;
  --muted: #4c6475;
  --border: #d7e3ed;
  --accent: #0f766e;
  --accent-strong: #0b5e58;
  --keyword-accent: #2455c8;
  --keyword-accent-strong: #1f46a3;
  --keyword-surface: #edf3ff;
  --keyword-border: #bfd0f5;
  --keyword-text: #244694;
  --focus: #ff8b3d;
  --shadow: 0 10px 30px rgba(10, 39, 61, 0.08);
  --radius: 14px;
  --radius-sm: 10px;
  --max-width: 1100px;
}
* { box-sizing: border-box; }
html { color-scheme: light; scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  line-height: 1.6;
  color: var(--text);
  font-family: "Segoe UI", "Trebuchet MS", "Noto Sans", sans-serif;
  background:
    radial-gradient(circle at 100% 0%, #ddf3e9 0, transparent 36%),
    radial-gradient(circle at 0% 0%, #dbe9ff 0, transparent 40%),
    linear-gradient(180deg, var(--bg-1), var(--bg-2));
}
a {
  color: var(--accent-strong);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.14em;
}
a:hover, a:focus-visible { color: var(--accent); }
.container { width: min(100% - 2rem, var(--max-width)); margin-inline: auto; }
.page {
  flex: 1 0 auto;
  padding-block: 1.1rem 3.2rem;
}
.skip-link {
  position: absolute; left: -9999px; top: 0.4rem; z-index: 99;
  background: #fff; color: #000; padding: 0.55rem 0.8rem;
  border-radius: var(--radius-sm); border: 2px solid var(--focus);
}
.skip-link:focus { left: 0.8rem; }
[data-include="footer"] { margin-top: auto; }
.site-footer { margin-top: auto; }

.site-header {
  position: sticky; top: 0; z-index: 30;
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(8px);
  background-color: rgba(255, 255, 255, 0.9);
}
.header-inner {
  display: grid; grid-template-columns: auto minmax(0, 1fr) auto; gap: 0.6rem;
  align-items: center; min-height: 4.1rem; padding-block: 0.35rem;
}
.brand {
  display: inline-flex; align-items: center; gap: 0.55rem;
  text-decoration: none; color: var(--text); font-weight: 700; letter-spacing: 0.02em;
}
.brand-logo {
  flex: 0 0 auto;
  width: 1.55rem;
  height: 1.55rem;
  border-radius: 0.34rem;
  object-fit: contain;
  filter: drop-shadow(0 1px 1px rgba(18, 28, 42, 0.18));
  transition: transform 170ms ease, filter 170ms ease;
}
.brand-name {
  white-space: nowrap;
}
.brand-mark {
  flex: 0 0 auto;
  width: 1.3em;
  height: 1.3em;
  display: inline-grid;
  place-items: center;
  font-size: 1.12rem;
  line-height: 1;
  filter: drop-shadow(0 1px 1px rgba(18, 28, 42, 0.2));
  transition: transform 170ms ease, filter 170ms ease;
}
.brand:hover .brand-logo,
.brand:focus-visible .brand-logo,
.brand:hover .brand-mark,
.brand:focus-visible .brand-mark {
  transform: translateY(-1px);
  filter: drop-shadow(0 2px 2px rgba(18, 28, 42, 0.24));
}
.nav-toggle {
  grid-column: 3;
  grid-row: 1;
  border: 1px solid var(--border); border-radius: 999px; background: var(--surface);
  color: var(--text); padding: 0.4rem 0.85rem; font-weight: 600; cursor: pointer;
}
.site-nav {
  grid-column: 1 / -1; grid-row: 2; display: none; flex-direction: column; gap: 0.2rem;
  padding-bottom: 0.55rem;
}
.site-nav.is-open { display: flex; }
.site-nav a {
  display: inline-block; text-decoration: none; color: var(--text); font-weight: 600;
  border-radius: var(--radius-sm); padding: 0.5rem 0.62rem;
}
.site-nav a:hover, .site-nav a:focus-visible, .site-nav a[aria-current="page"] {
  background: #e8f4f2;
}
.lang-switcher {
  position: relative;
  grid-column: 2;
  grid-row: 1;
  justify-self: stretch;
  width: 100%;
  max-width: 11.5rem;
  min-width: 0;
  padding: 0;
}
.lang-switcher-toggle {
  width: 100%;
  min-height: 2.2rem;
  min-width: 0;
  max-width: none;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: #ffffff;
  color: var(--text);
  padding: 0.24rem 0.36rem 0.24rem 0.38rem;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  justify-content: space-between;
  gap: 0.45rem;
  font-size: 0.86rem;
  font-weight: 650;
  cursor: pointer;
  box-shadow: none;
  transition: border-color 150ms ease, background-color 150ms ease;
}
.lang-switcher-toggle:hover {
  border-color: color-mix(in srgb, var(--accent) 45%, var(--border));
  box-shadow: none;
  background: #f8fbff;
}
.lang-switcher-toggle:focus-visible {
  border-color: var(--accent);
}
.lang-switcher-hint {
  display: inline-flex;
  align-items: center;
  gap: 0.22rem;
  border-radius: 999px;
  border: 1px solid color-mix(in srgb, var(--accent) 38%, var(--border));
  background: #e9f6f3;
  color: var(--accent-strong);
  padding: 0.15rem 0.42rem;
  line-height: 1;
}
.lang-switcher-globe {
  font-size: 0.78rem;
  line-height: 1;
}
.lang-switcher-hint-text {
  font-size: 0.67rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  white-space: nowrap;
}
.lang-switcher-current {
  display: flex;
  align-items: center;
  align-self: center;
  min-height: 1.35rem;
  line-height: 1.1;
  min-width: 0;
  padding-right: 0.1rem;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
  text-align: left;
}
.lang-switcher-caret {
  color: var(--accent-strong);
  font-size: 0.9rem;
  width: 1.5rem;
  height: 1.5rem;
  display: inline-grid;
  place-items: center;
  justify-self: end;
  border-radius: 999px;
  background: #edf7f4;
  border: 1px solid color-mix(in srgb, var(--accent) 35%, var(--border));
  transition: transform 150ms ease, background-color 150ms ease, border-color 150ms ease;
}
.lang-switcher-toggle:hover .lang-switcher-caret,
.lang-switcher-toggle:focus-visible .lang-switcher-caret {
  background: #e3f2ee;
  border-color: color-mix(in srgb, var(--accent) 55%, var(--border));
}
.lang-switcher.is-open .lang-switcher-caret {
  transform: rotate(180deg);
}
.lang-switcher-menu {
  position: absolute;
  top: calc(100% + 0.35rem);
  left: 50%;
  transform: translateX(-50%);
  right: auto;
  z-index: 45;
  width: min(92vw, 22rem);
  max-width: calc(100vw - 2rem);
  max-height: min(60vh, 20rem);
  overflow: auto;
  display: grid;
  gap: 0.24rem;
  padding: 0.42rem;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: 0 14px 34px rgba(10, 39, 61, 0.14);
}
.lang-switcher.is-large-set .lang-switcher-menu {
  grid-template-columns: repeat(auto-fit, minmax(8rem, 1fr));
}
.lang-switcher-menu[hidden] {
  display: none;
}
.lang-switcher-menu a {
  display: block;
  text-decoration: none;
  color: var(--muted);
  font-size: 0.84rem;
  line-height: 1.35;
  border: 1px solid transparent;
  border-radius: 10px;
  padding: 0.45rem 0.62rem;
}
.lang-switcher-menu a:hover,
.lang-switcher-menu a:focus-visible {
  background: #f2f8fe;
  border-color: color-mix(in srgb, var(--accent) 30%, var(--border));
}
.lang-switcher-menu a[aria-current="true"] {
  color: #fff;
  background: var(--accent);
  border-color: var(--accent);
}

@media (max-width: 859px) {
  .lang-switcher-hint-text { display: none; }
  .lang-switcher-hint {
    padding: 0.15rem 0.34rem;
  }
  .lang-switcher-toggle {
    padding-inline: 0.32rem;
    gap: 0.35rem;
  }
}

.hero, .section {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow); padding: 1.2rem;
}
.section { margin-top: 1.2rem; }
.eyebrow {
  margin: 0; color: var(--muted); font-size: 0.84rem;
  letter-spacing: 0.06em; text-transform: uppercase;
}
h1, h2, h3 { line-height: 1.2; }
h1 { margin-block: 0.4rem 0.7rem; font-size: clamp(1.55rem, 2.8vw, 2.2rem); }
h2 { margin-block: 0 0.7rem; font-size: clamp(1.2rem, 2.2vw, 1.55rem); }
h3 { margin-block: 0 0.45rem; font-size: 1.06rem; }

.language-note {
  border-left: 4px solid #f5a035;
  background: #fff7eb;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: #754500;
  padding: 0.6rem 0.8rem;
  margin-top: 1rem;
}
.card-grid {
  display: grid; gap: 0.9rem; grid-template-columns: 1fr;
}
.card {
  background: var(--surface-alt); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 0.95rem;
}
.card-result {
  margin-top: 0.35rem;
  color: var(--accent-strong);
  font-size: 0.94rem;
  font-weight: 600;
}
.button, button, input, textarea { font: inherit; }
.button, button {
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: 999px; border: 1px solid transparent; cursor: pointer;
  padding: 0.6rem 1rem; text-decoration: none; font-weight: 600;
}
.button,
button[type="submit"],
button:not(.button-secondary):not(.button-tertiary) {
  background: var(--accent); color: #fff;
}
.button:hover,
button[type="submit"]:hover,
button:not(.button-secondary):not(.button-tertiary):hover {
  background: var(--accent-strong);
}
.button-secondary {
  background: #fff; color: var(--accent-strong); border-color: var(--accent-strong);
}
.button-secondary:hover { background: #edf9f7; }
.button-tertiary {
  background: #fff; color: var(--muted); border-color: var(--border);
}
.button-tertiary:hover { background: #f4f8fc; }
.case-button.is-active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.case-button.is-active:hover {
  background: var(--accent-strong);
  border-color: var(--accent-strong);
}

.tool-form { display: grid; gap: 0.9rem; }
.form-row { display: grid; gap: 0.35rem; }
.stats-grid {
  display: grid;
  gap: 0.6rem;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
}
.stat-card {
  border: 1px solid var(--border);
  background: var(--surface-alt);
  border-radius: var(--radius-sm);
  padding: 0.75rem 0.85rem;
}
.stat-label {
  margin: 0;
  color: var(--muted);
  font-size: 0.86rem;
}
.stat-value {
  margin: 0.2rem 0 0;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text);
}
.metronome-stats-grid {
  margin-top: 0.2rem;
}
.metronome-bpm-row {
  display: flex;
  align-items: center;
  gap: 0.55rem;
}
.metronome-bpm-row input[type="number"] {
  max-width: 7.2rem;
}
input[type="range"] {
  width: 100%;
  padding: 0;
  border: none;
  border-radius: 0;
  background: transparent;
}
.metronome-stats-grid .stat-value {
  font-size: 1.05rem;
}
.metronome-unit {
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 600;
}
.metronome-beat-indicator {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  min-height: 1rem;
}
.metronome-tap-values {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin: 0;
  min-height: 1.7rem;
  color: var(--muted);
  font-size: 0.9rem;
}
.metronome-tap-chip {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: #fff;
  color: var(--text);
  font-size: 0.82rem;
  padding: 0.16rem 0.54rem;
}
.metronome-beat-dot {
  width: 0.9rem;
  height: 0.9rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: #fff;
  transition: transform 120ms ease, background-color 120ms ease, border-color 120ms ease;
}
.metronome-beat-dot.is-accent {
  border-color: color-mix(in srgb, var(--accent) 35%, var(--border));
}
.metronome-beat-dot.is-active {
  transform: scale(1.2);
  background: var(--accent);
  border-color: var(--accent);
}
.metronome-beat-dot.is-active.is-accent {
  background: var(--accent-strong);
  border-color: var(--accent-strong);
}
.field-label {
  margin: 0;
  font-weight: 600;
}
.field-help {
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
}
.word-counter-character-mode-guide {
  margin: 0;
  padding-left: 1.2rem;
  display: grid;
  gap: 0.32rem;
  color: var(--muted);
  font-size: 0.88rem;
}
.word-counter-character-mode-guide strong {
  color: var(--text);
}
.word-counter-mode-row {
  align-items: center;
}
.word-counter-mode-button.is-active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.word-counter-mode-button.is-active:hover {
  background: var(--accent-strong);
  border-color: var(--accent-strong);
}
.encoding-decoding-mode-row {
  align-items: center;
}
.encoding-decoding-mode-button {
  min-width: 7.2rem;
}
.encoding-decoding-mode-button.is-active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.encoding-decoding-mode-button.is-active:hover {
  background: var(--accent-strong);
  border-color: var(--accent-strong);
}
.encoding-decoding-method-list {
  display: grid;
  gap: 0.48rem;
  height: clamp(17rem, 50vh, 23rem);
  overflow-y: auto;
  overflow-x: hidden;
  scrollbar-gutter: stable;
  padding: 0.52rem;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface-alt);
}
.encoding-decoding-method-group {
  display: grid;
  gap: 0.36rem;
}
.encoding-decoding-method-subgroup {
  margin-top: 0.08rem;
}
.encoding-decoding-group-toggle {
  width: 100%;
  min-height: 2.3rem;
  justify-content: flex-start;
  gap: 0.5rem;
  text-align: left;
  border-radius: 10px;
  padding-inline: 0.72rem;
}
.encoding-decoding-group-caret {
  display: inline-grid;
  place-items: center;
  width: 1rem;
  color: var(--muted);
  transition: transform 140ms ease;
}
.encoding-decoding-group-toggle[aria-expanded="false"] .encoding-decoding-group-caret {
  transform: rotate(-90deg);
}
.encoding-decoding-group-name {
  font-weight: 700;
  color: var(--text);
}
.encoding-decoding-group-count {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 1.7rem;
  min-height: 1.3rem;
  padding: 0 0.4rem;
  border: 1px solid color-mix(in srgb, var(--accent) 28%, var(--border));
  border-radius: 999px;
  background: #edf8f6;
  color: var(--accent-strong);
  font-size: 0.72rem;
  font-weight: 700;
}
.encoding-decoding-group-children {
  display: grid;
  gap: 0.36rem;
  padding-left: 0.56rem;
  border-left: 2px solid color-mix(in srgb, var(--accent) 16%, var(--border));
}
.encoding-decoding-group-children[hidden] {
  display: none;
}
.encoding-decoding-method-subgroup > .encoding-decoding-group-children {
  padding-left: 0.62rem;
}
.encoding-decoding-method-card {
  width: 100%;
  height: 4.1rem;
  min-height: 4.1rem;
  max-height: 4.1rem;
  display: grid;
  gap: 0.16rem;
  align-content: center;
  justify-items: start;
  border-radius: 10px;
  text-align: left;
  padding: 0.54rem 0.8rem;
}
.encoding-decoding-method-card strong {
  width: 100%;
  font-size: 0.95rem;
  line-height: 1.2;
  overflow: hidden;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 1;
  text-overflow: ellipsis;
}
.encoding-decoding-method-description {
  width: 100%;
  font-size: 0.82rem;
  color: var(--muted);
  line-height: 1.3;
  font-weight: 520;
  overflow: hidden;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}
.encoding-decoding-method-card.is-active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.encoding-decoding-method-card.is-active:hover {
  background: var(--accent-strong);
  border-color: var(--accent-strong);
}
.encoding-decoding-method-card.is-active .encoding-decoding-method-description {
  color: rgba(255, 255, 255, 0.88);
}
.encoding-decoding-current-tool {
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  border: 1px solid color-mix(in srgb, var(--accent) 32%, var(--border));
  border-radius: 10px;
  background: #edf8f6;
  padding: 0.52rem 0.72rem;
}
.encoding-decoding-current-tool-label {
  color: var(--muted);
  font-size: 0.77rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.encoding-decoding-current-tool strong {
  color: var(--accent-strong);
  font-size: 0.98rem;
}
@media (max-width: 680px) {
  .encoding-decoding-method-card {
    height: auto;
    min-height: 4.95rem;
    max-height: 4.95rem;
  }
  .encoding-decoding-method-card strong {
    width: 100%;
  }
}
.encoding-decoding-hex-options {
  display: grid;
  gap: 0.6rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface-alt);
  padding: 0.75rem;
}
.encoding-decoding-hex-options[hidden] {
  display: none;
}
.encoding-decoding-hex-option-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}
.encoding-decoding-hex-option-button {
  min-height: 2rem;
  padding-inline: 0.74rem;
  font-size: 0.84rem;
}
.encoding-decoding-hex-option-button.is-active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.encoding-decoding-base-options {
  display: grid;
  gap: 0.72rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface-alt);
  padding: 0.75rem;
}
.encoding-decoding-base-options[hidden] {
  display: none;
}
.encoding-decoding-preset-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}
.encoding-decoding-preset-button {
  min-height: 2rem;
  padding-inline: 0.74rem;
  font-size: 0.84rem;
}
.encoding-decoding-preset-button.is-active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.encoding-decoding-workbench {
  display: grid;
  gap: 0.72rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface-alt);
  padding: 0.75rem;
}
.encoding-decoding-operation-row {
  gap: 0.45rem;
}
.encoding-decoding-io-grid {
  display: grid;
  gap: 0.7rem;
}
.encoding-decoding-io-grid textarea {
  min-height: 11rem;
}
@media (min-width: 860px) {
  .encoding-decoding-io-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    align-items: start;
  }
}
.tool-search-form { display: grid; gap: 0.5rem; }
.tool-search-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}
.tool-search-row input[type="search"] {
  flex: 1 1 240px;
}
.tool-category-filter {
  margin-top: 0.8rem;
  display: grid;
  gap: 0.45rem;
}
.tool-keyword-filter {
  margin-top: 0.8rem;
  display: grid;
  gap: 0.45rem;
}
.tool-category-title {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 600;
}
.tool-keyword-title {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 600;
}
.tool-category-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}
.tool-keyword-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}
.tool-category-button {
  min-height: 2.15rem;
  padding-inline: 0.85rem;
  color: var(--accent-strong);
  background: #ecf8f4;
  border-color: color-mix(in srgb, var(--accent) 30%, var(--border));
}
.tool-keyword-button {
  min-height: 2.15rem;
  padding-inline: 0.85rem;
  color: var(--keyword-text);
  background: var(--keyword-surface);
  border-color: var(--keyword-border);
}
.tool-category-button:hover {
  background: #def2eb;
  border-color: color-mix(in srgb, var(--accent) 50%, var(--border));
}
.tool-keyword-button:hover {
  background: #e1ebff;
  border-color: color-mix(in srgb, var(--keyword-accent) 42%, var(--keyword-border));
}
.tool-filter-overflow {
  margin-inline-start: auto;
  flex: 0 0 auto;
  align-self: flex-start;
}
.tool-filter-overflow-toggle {
  min-width: 2.15rem;
  width: 2.15rem;
  min-height: 2.15rem;
  padding-inline: 0;
  display: inline-grid;
  place-items: center;
}
.tool-filter-overflow-toggle::before {
  content: "▼";
  font-size: 0.72rem;
  line-height: 1;
}
.tool-filter-overflow-toggle[aria-expanded="true"]::before {
  content: "▲";
}
.tool-filter-overflow-inline {
  flex: 1 0 100%;
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-top: 0.12rem;
}
.tool-filter-overflow-inline[hidden] {
  display: none;
}
.tool-category-button.is-active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.tool-keyword-button.is-active {
  background: var(--keyword-accent);
  color: #fff;
  border-color: var(--keyword-accent);
}
.tool-category-button.is-active:hover {
  background: var(--accent-strong);
  border-color: var(--accent-strong);
}
.tool-keyword-button.is-active:hover {
  background: var(--keyword-accent-strong);
  border-color: var(--keyword-accent-strong);
}
label { font-weight: 600; }
input, textarea, select {
  border: 1px solid var(--border); border-radius: 10px; background: #fff;
  color: var(--text); padding: 0.6rem 0.7rem;
}
textarea { resize: vertical; }
input:focus, textarea:focus, select:focus, button:focus-visible, a:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--focus) 42%, #fff);
  outline-offset: 2px;
}
.button-row { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.tool-result-highlight {
  margin: 0;
  border: 1px solid color-mix(in srgb, var(--accent) 35%, #fff);
  border-radius: 10px;
  background: #f3fbfa;
  color: var(--text);
  font-weight: 700;
  line-height: 1.45;
  padding: 0.65rem 0.75rem;
  min-height: 2.65rem;
}
.feedback { min-height: 1.2rem; color: var(--muted); font-size: 0.95rem; margin: 0; }
ol, ul { padding-left: 1.15rem; }

.faq-list details {
  border: 1px solid var(--border); border-radius: var(--radius-sm);
  background: var(--surface-alt); padding: 0.65rem 0.75rem; margin-bottom: 0.6rem;
}
.faq-list summary { cursor: pointer; font-weight: 600; }
.link-list { display: grid; gap: 0.35rem; }
.card[hidden] { display: none !important; }
.tool-card {
  cursor: pointer;
  transition: border-color 140ms ease, box-shadow 140ms ease;
}
.tool-card:hover {
  border-color: color-mix(in srgb, var(--accent) 38%, var(--border));
  box-shadow: 0 9px 24px rgba(10, 39, 61, 0.12);
}
.tool-card:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}
.tool-card h3 a {
  position: relative;
  z-index: 1;
}
.tool-card-categories {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  margin: 0.55rem 0 0;
}
.tool-card-keywords {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  margin: 0.45rem 0 0;
}
.tool-category-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.28rem;
  border: 1px solid color-mix(in srgb, var(--accent) 35%, var(--border));
  border-radius: 999px;
  padding: 0.18rem 0.56rem;
  font-size: 0.8rem;
  font-weight: 650;
  color: var(--accent-strong);
  background: #f3fbfa;
  line-height: 1.2;
  min-height: 0;
  padding-block: 0.2rem;
  padding-inline: 0.56rem;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.8);
  transition: transform 130ms ease, border-color 130ms ease, box-shadow 130ms ease, background-color 130ms ease;
}
.tool-keyword-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.28rem;
  border: 1px solid var(--keyword-border);
  border-radius: 999px;
  padding: 0.18rem 0.56rem;
  font-size: 0.8rem;
  font-weight: 640;
  color: var(--keyword-text);
  background: var(--keyword-surface);
  line-height: 1.2;
  min-height: 0;
  padding-block: 0.2rem;
  padding-inline: 0.56rem;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.84);
  transition: transform 130ms ease, border-color 130ms ease, box-shadow 130ms ease, background-color 130ms ease;
}
.tool-category-chip::before,
.tool-keyword-chip::before {
  content: "+";
  font-weight: 800;
  font-size: 0.82em;
  line-height: 1;
}
.tool-category-chip:hover,
.tool-keyword-chip:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 15px rgba(10, 39, 61, 0.1);
}
.tool-category-chip.is-active {
  color: #fff;
  background: var(--accent);
  border-color: var(--accent);
  box-shadow: 0 7px 16px rgba(15, 118, 110, 0.25);
}
.tool-keyword-chip.is-active {
  color: #fff;
  background: var(--keyword-accent);
  border-color: var(--keyword-accent);
  box-shadow: 0 7px 16px rgba(36, 85, 200, 0.25);
}
.tool-category-chip.is-active::before,
.tool-keyword-chip.is-active::before {
  content: "✓";
}
.tool-category-chip:focus-visible {
  border-color: var(--accent);
  outline: none;
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--accent) 32%, transparent);
}
.tool-keyword-chip:focus-visible {
  border-color: var(--keyword-accent);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--keyword-accent) 30%, transparent);
}
.sponsor-card {
  display: grid;
  gap: 0.45rem;
}
.sponsor-card-title {
  margin: 0;
}
.sponsor-card-status {
  margin: 0;
  color: var(--accent-strong);
  font-size: 0.88rem;
  font-weight: 600;
}
.sponsor-card-button[disabled] {
  opacity: 0.82;
  cursor: not-allowed;
}
.sponsor-card-note {
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.tool-toast {
  position: fixed;
  left: 50%;
  bottom: 1.2rem;
  transform: translate(-50%, 22px);
  background: #102a43;
  color: #fff;
  padding: 0.6rem 0.9rem;
  border-radius: 10px;
  box-shadow: 0 10px 24px rgba(16, 42, 67, 0.28);
  font-size: 0.92rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.28s ease, transform 0.28s cubic-bezier(0.22, 1, 0.36, 1);
  z-index: 1200;
}
.tool-toast.is-visible {
  opacity: 1;
  transform: translate(-50%, 0);
}
.tool-toast.is-error {
  background: #8b1d2c;
}

.site-footer {
  border-top: 1px solid var(--border); background: rgba(255, 255, 255, 0.92);
}
.footer-inner { padding-block: 1.2rem; }
.footer-links { display: flex; flex-wrap: wrap; gap: 0.55rem 0.95rem; }
.footer-links a { text-decoration: none; color: var(--muted); }
.footer-links a:hover, .footer-links a:focus-visible, .footer-links a[aria-current="page"] {
  color: var(--accent-strong);
}
.copyright { margin-bottom: 0; color: var(--muted); font-size: 0.92rem; }

@media (min-width: 860px) {
  .header-inner { grid-template-columns: auto 1fr auto; gap: 1.2rem; }
  .nav-toggle { display: none; }
  .site-nav {
    grid-column: auto; grid-row: auto; display: flex; flex-direction: row;
    align-items: center; gap: 0.2rem; padding: 0;
  }
  .lang-switcher {
    grid-column: auto;
    grid-row: auto;
    justify-self: flex-end;
    width: auto;
    max-width: none;
    padding: 0;
  }
  .lang-switcher-toggle {
    width: auto;
    min-width: 11rem;
    max-width: 13rem;
  }
  .lang-switcher-menu {
    left: auto;
    transform: none;
    right: 0;
    width: min(92vw, 22rem);
    max-width: none;
  }
  .hero, .section { padding: 1.4rem; }
  .card-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

.hero, .section, .card, .faq-list details { animation: rise-in 0.45s ease both; }
.card:nth-child(2) { animation-delay: 0.07s; }
@keyframes rise-in {
  from { opacity: 0; transform: translateY(11px); }
  to { opacity: 1; transform: translateY(0); }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }
}