/* ==========================================================================
   果库雷达 · 设计系统
   浅色为主、自动跟随系统深色；无外部字体与图标资源，部署即用。
   ========================================================================== */

:root {
  color-scheme: light;
  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;

  --bg: #f5f6fa;
  --bg-elevated: #ffffff;
  --bg-soft: #eef1f8;
  --bg-inverse: #0b1220;
  --ink: #101828;
  --ink-soft: #475467;
  --ink-faint: #667085;
  --ink-inverse: #f8fafc;
  --border: rgba(16, 24, 40, 0.1);
  --border-strong: rgba(16, 24, 40, 0.18);

  --accent: #0f9d8f;
  --accent-strong: #0b7f74;
  --accent-soft: rgba(15, 157, 143, 0.12);
  --indigo: #4f46e5;
  --indigo-soft: rgba(79, 70, 229, 0.12);
  --danger: #d92d20;
  --danger-soft: rgba(217, 45, 32, 0.1);
  --warning: #b54708;
  --warning-soft: rgba(181, 71, 8, 0.12);
  --success: #067647;
  --success-soft: rgba(6, 118, 71, 0.12);

  --radius-sm: 10px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --shadow-sm: 0 1px 2px rgba(16, 24, 40, 0.06);
  --shadow-md: 0 12px 30px -18px rgba(16, 24, 40, 0.35);
  --shadow-lg: 0 30px 70px -40px rgba(16, 24, 40, 0.45);
  --container: 1120px;
  --header-h: 64px;

  --grad-hero: radial-gradient(1100px 520px at 8% -10%, rgba(79, 70, 229, 0.16), transparent 60%),
    radial-gradient(900px 500px at 95% 0%, rgba(15, 157, 143, 0.16), transparent 55%),
    radial-gradient(700px 500px at 55% 110%, rgba(255, 107, 90, 0.1), transparent 60%);
}

[data-theme="dark"] {
  color-scheme: dark;
  --bg: #070b14;
  --bg-elevated: #0e1524;
  --bg-soft: #121a2b;
  --bg-inverse: #f8fafc;
  --ink: #e6ebf4;
  --ink-soft: #a9b4c6;
  --ink-faint: #8492a6;
  --ink-inverse: #0b1220;
  --border: rgba(148, 163, 184, 0.16);
  --border-strong: rgba(148, 163, 184, 0.28);
  --accent: #34d3c0;
  --accent-strong: #6ee7d8;
  --accent-soft: rgba(52, 211, 192, 0.14);
  --indigo: #8b93ff;
  --indigo-soft: rgba(139, 147, 255, 0.16);
  --danger: #ff8f85;
  --danger-soft: rgba(255, 143, 133, 0.14);
  --warning: #fdb022;
  --warning-soft: rgba(253, 176, 34, 0.16);
  --success: #47cd89;
  --success-soft: rgba(71, 205, 137, 0.16);
  --shadow-md: 0 18px 40px -24px rgba(0, 0, 0, 0.8);
  --shadow-lg: 0 40px 80px -40px rgba(0, 0, 0, 0.9);
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

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

a:hover {
  text-decoration: underline;
}

:focus-visible {
  outline: 3px solid var(--indigo);
  outline-offset: 2px;
  border-radius: 6px;
}

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  top: -60px;
  left: 16px;
  z-index: 100;
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  background: var(--ink);
  color: var(--ink-inverse);
  transition: top 0.15s ease;
}

.skip-link:focus {
  top: 12px;
}

/* --------------------------------------------------------------- header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  border-bottom: 1px solid transparent;
  backdrop-filter: saturate(160%) blur(14px);
  transition: border-color 0.2s ease, background 0.2s ease;
}

.site-header.is-scrolled {
  border-bottom-color: var(--border);
  background: color-mix(in srgb, var(--bg) 92%, transparent);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 20px;
  min-height: var(--header-h);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.01em;
  color: var(--ink);
}

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

.brand-mark {
  width: 30px;
  height: 30px;
  flex: none;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
}

.site-nav a {
  padding: 8px 12px;
  border-radius: 999px;
  color: var(--ink-soft);
  font-size: 0.92rem;
  font-weight: 500;
  white-space: nowrap;
}

.site-nav a:hover {
  background: var(--bg-soft);
  color: var(--ink);
  text-decoration: none;
}

.site-nav a[aria-current="page"] {
  color: var(--ink);
  background: var(--bg-soft);
  box-shadow: inset 0 0 0 1px var(--border);
}

.nav-toggle,
.theme-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  color: var(--ink-soft);
  cursor: pointer;
}

.theme-toggle {
  display: inline-flex;
  margin-left: 6px;
}

.mode-strip {
  border-top: 1px solid var(--border);
  background: var(--warning-soft);
  color: var(--ink);
  font-size: 0.82rem;
}

.mode-strip .container {
  display: flex;
  align-items: center;
  gap: 8px;
  padding-top: 7px;
  padding-bottom: 7px;
}

.mode-strip strong {
  font-weight: 700;
}

/* --------------------------------------------------------------- buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 46px;
  padding: 11px 22px;
  border: 1px solid transparent;
  border-radius: 999px;
  font: inherit;
  font-weight: 600;
  font-size: 0.95rem;
  line-height: 1.2;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(0);
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--indigo));
  color: #fff;
  box-shadow: 0 14px 30px -16px rgba(79, 70, 229, 0.7);
}

.btn-primary:hover {
  box-shadow: 0 18px 36px -16px rgba(79, 70, 229, 0.8);
}

.btn-ghost {
  background: var(--bg-elevated);
  border-color: var(--border-strong);
  color: var(--ink);
}

.btn-ghost:hover {
  background: var(--bg-soft);
}

.btn[disabled],
.btn[aria-busy="true"] {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.btn-block {
  width: 100%;
}

/* --------------------------------------------------------------- layout */
.page {
  padding: 40px 0 88px;
}

.page-hero {
  background: var(--grad-hero);
  padding: 64px 0 48px;
  border-bottom: 1px solid var(--border);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
  padding: 6px 14px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  color: var(--ink-soft);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.eyebrow .dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-soft);
}

h1,
h2,
h3,
h4 {
  margin: 0;
  line-height: 1.18;
  letter-spacing: -0.02em;
  font-weight: 700;
}

h1 {
  font-size: clamp(2.1rem, 5vw, 3.4rem);
}

h2 {
  font-size: clamp(1.45rem, 2.6vw, 2rem);
}

h3 {
  font-size: 1.15rem;
}

.lede {
  margin: 18px 0 0;
  max-width: 62ch;
  color: var(--ink-soft);
  font-size: clamp(1rem, 1.5vw, 1.12rem);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: 48px;
  align-items: center;
}

.section {
  padding: 64px 0 0;
}

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 28px;
}

.section-head p {
  margin: 8px 0 0;
  color: var(--ink-soft);
  max-width: 60ch;
}

.grid {
  display: grid;
  gap: 20px;
}

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

.grid-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid-4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

/* --------------------------------------------------------------- cards */
.card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 26px;
  box-shadow: var(--shadow-sm);
}

.card-link {
  display: flex;
  flex-direction: column;
  gap: 10px;
  color: inherit;
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}

.card-link:hover {
  transform: translateY(-3px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-md);
  text-decoration: none;
}

.card-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--accent-strong);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.card h3 {
  margin-top: 2px;
}

.card p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.95rem;
}

.card .arrow {
  margin-top: auto;
  padding-top: 8px;
  color: var(--accent-strong);
  font-weight: 600;
  font-size: 0.9rem;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 11px;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 600;
}

.badge-soft {
  background: var(--bg-soft);
  color: var(--ink-soft);
  border: 1px solid var(--border);
}

.badge-success {
  background: var(--success-soft);
  color: var(--success);
}

.badge-danger {
  background: var(--danger-soft);
  color: var(--danger);
}

.badge-warning {
  background: var(--warning-soft);
  color: var(--warning);
}

.badge-accent {
  background: var(--accent-soft);
  color: var(--accent-strong);
}

.stat-row {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  margin-top: 36px;
}

.stat {
  padding: 18px 20px;
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--bg-elevated) 82%, transparent);
  border: 1px solid var(--border);
}

.stat strong {
  display: block;
  font-size: 1.5rem;
  letter-spacing: -0.02em;
}

.stat span {
  color: var(--ink-faint);
  font-size: 0.82rem;
}

/* --------------------------------------------------------------- checker */
.checker-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
  gap: 28px;
  align-items: start;
}

.checker-card {
  padding: 28px;
  border-radius: var(--radius-xl);
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  box-shadow: var(--shadow-lg);
}

.checker-card h2 {
  font-size: 1.35rem;
}

.checker-card > p {
  margin: 8px 0 22px;
  color: var(--ink-soft);
  font-size: 0.94rem;
}

.field {
  margin-bottom: 16px;
}

.field-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.field label,
.field > .field-label {
  display: block;
  margin-bottom: 7px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--ink-soft);
}

.field select,
.field input {
  width: 100%;
  min-height: 48px;
  padding: 11px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-strong);
  background: var(--bg);
  color: var(--ink);
  font: inherit;
  font-size: 0.95rem;
}

.field select:focus,
.field input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-soft);
}

.field input::placeholder {
  color: var(--ink-faint);
}

.field-hint {
  margin: 7px 0 0;
  color: var(--ink-faint);
  font-size: 0.8rem;
}

.fieldset {
  margin: 0 0 18px;
  padding: 0;
  border: 0;
}

.fieldset legend {
  margin-bottom: 12px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--ink-soft);
}

.segmented {
  display: inline-flex;
  gap: 6px;
  padding: 5px;
  border-radius: 999px;
  background: var(--bg-soft);
  border: 1px solid var(--border);
}

.segmented label {
  position: relative;
}

.segmented input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.segmented span {
  display: inline-block;
  padding: 8px 18px;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--ink-soft);
  cursor: pointer;
}

.segmented input:checked + span {
  background: var(--bg-elevated);
  color: var(--ink);
  box-shadow: var(--shadow-sm);
}

.segmented input:focus-visible + span {
  outline: 3px solid var(--indigo);
  outline-offset: 2px;
}

.captcha-slot {
  margin: 4px 0 18px;
  min-height: 78px;
}

.captcha-slot:empty::before {
  content: "人机验证组件加载中…";
  display: flex;
  align-items: center;
  justify-content: center;
  height: 78px;
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-sm);
  color: var(--ink-faint);
  font-size: 0.85rem;
}

.form-note {
  margin-top: 14px;
  color: var(--ink-faint);
  font-size: 0.8rem;
}

.form-alert {
  margin: 0 0 16px;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  background: var(--danger-soft);
  color: var(--danger);
  font-size: 0.88rem;
  font-weight: 500;
}

.form-alert[hidden] {
  display: none;
}

/* --------------------------------------------------------- results area */
.results-card {
  border-radius: var(--radius-xl);
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  padding: 28px;
  min-height: 320px;
  box-shadow: var(--shadow-md);
}

.results-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--border);
}

.results-head h2 {
  font-size: 1.2rem;
}

.results-meta {
  color: var(--ink-faint);
  font-size: 0.8rem;
}

.summary-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 18px 0 6px;
}

.results-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 220px;
  color: var(--ink-faint);
  text-align: center;
  font-size: 0.92rem;
}

.results-empty svg {
  opacity: 0.5;
}

.store-list {
  display: grid;
  gap: 12px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.store {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 14px;
  align-items: start;
  padding: 16px 18px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: var(--bg);
}

.store-name {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-weight: 600;
}

.store-address {
  margin: 4px 0 0;
  color: var(--ink-faint);
  font-size: 0.82rem;
}

.store-message {
  margin: 6px 0 0;
  color: var(--ink-soft);
  font-size: 0.82rem;
}

.status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 700;
  white-space: nowrap;
}

.status::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: currentColor;
}

.status-available {
  background: var(--success-soft);
  color: var(--success);
}

.status-unavailable {
  background: var(--danger-soft);
  color: var(--danger);
}

.status-unknown {
  background: var(--warning-soft);
  color: var(--warning);
}

.store-detailed {
  grid-template-columns: minmax(0, 1fr);
}

.store-info {
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-width: 0;
}

.store-distance {
  color: var(--ink-faint);
  font-size: 0.78rem;
  font-weight: 500;
}

.matrix-wrap {
  overflow-x: auto;
  margin-top: 2px;
}

.matrix {
  border-collapse: separate;
  border-spacing: 4px;
  width: 100%;
}

.matrix th,
.matrix td {
  padding: 5px 7px;
  text-align: center;
  font-size: 0.74rem;
  white-space: nowrap;
}

.matrix thead th {
  color: var(--ink-faint);
  font-weight: 600;
}

.matrix tbody th {
  text-align: left;
  color: var(--ink-soft);
  font-weight: 600;
}

.matrix .status {
  padding: 3px 8px;
  font-size: 0.7rem;
}

.matrix tr.is-selected-row th,
.matrix tr.is-selected-row td {
  background: var(--accent-soft);
}

.matrix td.is-selected-col {
  box-shadow: inset 0 0 0 1px var(--accent);
  border-radius: 6px;
}

.config-list {
  margin-top: 2px;
  display: flex;
  flex-direction: column;
}

.config-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 9px 0;
  border-top: 1px dashed var(--border);
  font-size: 0.84rem;
  color: var(--ink-soft);
}

.config-row:first-child {
  border-top: 0;
}

.config-row .status {
  flex: none;
}

.config-row.is-selected-row {
  background: var(--accent-soft);
  border-radius: 8px;
  padding: 9px 10px;
  border-top-color: transparent;
}

.config-row.is-selected-row + .config-row {
  border-top-color: transparent;
}

.results-footer {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px dashed var(--border);
  color: var(--ink-faint);
  font-size: 0.8rem;
}

.notice-inline {
  margin-top: 18px;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  background: var(--warning-soft);
  color: var(--warning);
  font-size: 0.84rem;
}

/* --------------------------------------------------------------- content */
.prose {
  max-width: 76ch;
}

.prose h2 {
  margin-top: 48px;
}

.prose h2:first-child {
  margin-top: 0;
}

.prose h3 {
  margin-top: 28px;
}

.prose p,
.prose li {
  color: var(--ink-soft);
}

.prose ul,
.prose ol {
  padding-left: 22px;
}

.prose li + li {
  margin-top: 6px;
}

.callout {
  margin: 28px 0;
  padding: 20px 22px;
  border-radius: var(--radius-md);
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  color: var(--ink);
  font-size: 0.94rem;
}

.faq details {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--bg-elevated);
  padding: 0 20px;
}

.faq details + details {
  margin-top: 12px;
}

.faq summary {
  cursor: pointer;
  padding: 18px 0;
  font-weight: 600;
  list-style: none;
}

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

.faq summary::after {
  content: "+";
  float: right;
  color: var(--ink-faint);
  font-weight: 400;
}

.faq details[open] summary::after {
  content: "–";
}

.faq .faq-body {
  padding: 0 0 18px;
  color: var(--ink-soft);
  font-size: 0.94rem;
}

.timeline {
  display: grid;
  gap: 14px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.timeline li {
  display: grid;
  grid-template-columns: 140px minmax(0, 1fr);
  gap: 16px;
  padding: 16px 18px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: var(--bg-elevated);
}

.timeline time {
  font-weight: 700;
  color: var(--accent-strong);
  font-variant-numeric: tabular-nums;
}

.timeline span {
  color: var(--ink-soft);
  font-size: 0.92rem;
}

.spec-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-top: 24px;
}

.spec {
  padding: 18px;
  border-radius: var(--radius-md);
  background: var(--bg-soft);
}

.spec dt {
  color: var(--ink-faint);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.spec dd {
  margin: 6px 0 0;
  font-weight: 600;
}

.table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}

.table th,
.table td {
  padding: 10px 8px;
  text-align: left;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

.table th {
  color: var(--ink-faint);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.table tr:last-child td {
  border-bottom: 0;
}

@media (max-width: 720px) {
  .table-wrap {
    overflow-x: auto;
  }
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin-bottom: 20px;
  color: var(--ink-faint);
  font-size: 0.82rem;
}

.breadcrumbs a {
  color: var(--ink-soft);
}

.breadcrumbs span[aria-hidden="true"] {
  color: var(--ink-faint);
}

.cta-band {
  margin-top: 64px;
  padding: 40px;
  border-radius: var(--radius-xl);
  border: 1px solid var(--border);
  background: linear-gradient(135deg, var(--accent-soft), var(--indigo-soft));
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 22px;
}

.cta-band h2 {
  font-size: 1.5rem;
}

.cta-band p {
  margin: 8px 0 0;
  color: var(--ink-soft);
  max-width: 52ch;
}

/* --------------------------------------------------------------- footer */
.site-footer {
  margin-top: 40px;
  border-top: 1px solid var(--border);
  background: var(--bg-elevated);
  padding: 44px 0 28px;
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) repeat(2, minmax(0, 1fr));
  gap: 32px;
}

.footer-brand p {
  margin: 12px 0 0;
  color: var(--ink-faint);
  font-size: 0.85rem;
  max-width: 40ch;
}

.footer-col h3 {
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.footer-col ul {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
}

.footer-col li + li {
  margin-top: 8px;
}

.footer-col a {
  color: var(--ink-soft);
  font-size: 0.88rem;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  margin-top: 36px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  color: var(--ink-faint);
  font-size: 0.8rem;
}

/* --------------------------------------------------------------- toast */
.toast {
  position: fixed;
  left: 50%;
  bottom: 28px;
  transform: translateX(-50%);
  padding: 11px 20px;
  border-radius: 999px;
  background: var(--ink);
  color: var(--ink-inverse);
  font-size: 0.86rem;
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  z-index: 80;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}

.toast.is-visible {
  opacity: 1;
}

/* --------------------------------------------------------------- motion */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

/* --------------------------------------------------------------- responsive */
@media (max-width: 980px) {
  .hero-grid,
  .checker-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 32px;
  }

  .grid-4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .grid-3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

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

  .site-nav {
    position: absolute;
    top: var(--header-h);
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    padding: 12px 16px 18px;
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-md);
  }

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

  .site-nav a {
    padding: 12px 14px;
    border-radius: var(--radius-sm);
  }

  .theme-toggle {
    display: none;
  }

  .site-nav .theme-toggle {
    display: inline-flex;
    margin: 8px 0 0;
    width: auto;
  }

  .site-nav .theme-toggle::after {
    content: "切换主题";
    margin-left: 8px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--ink-soft);
  }
}

@media (max-width: 640px) {
  .container {
    padding: 0 18px;
  }

  .page-hero {
    padding: 42px 0 34px;
  }

  .section {
    padding-top: 44px;
  }

  .grid-2,
  .grid-3,
  .grid-4,
  .field-row,
  .spec-grid,
  .timeline li {
    grid-template-columns: minmax(0, 1fr);
  }

  .timeline li {
    gap: 4px;
  }

  .checker-card,
  .results-card {
    padding: 22px;
  }

  .cta-band {
    padding: 26px 22px;
  }

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

  .footer-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
  }
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #070b14;
    --bg-elevated: #0e1524;
    --bg-soft: #121a2b;
    --bg-inverse: #f8fafc;
    --ink: #e6ebf4;
    --ink-soft: #a9b4c6;
    --ink-faint: #8492a6;
    --ink-inverse: #0b1220;
    --border: rgba(148, 163, 184, 0.16);
    --border-strong: rgba(148, 163, 184, 0.28);
    --accent: #34d3c0;
    --accent-strong: #6ee7d8;
    --accent-soft: rgba(52, 211, 192, 0.14);
    --indigo: #8b93ff;
    --indigo-soft: rgba(139, 147, 255, 0.16);
    --danger: #ff8f85;
    --danger-soft: rgba(255, 143, 133, 0.14);
    --warning: #fdb022;
    --warning-soft: rgba(253, 176, 34, 0.16);
    --success: #47cd89;
    --success-soft: rgba(71, 205, 137, 0.16);
    --shadow-md: 0 18px 40px -24px rgba(0, 0, 0, 0.8);
    --shadow-lg: 0 40px 80px -40px rgba(0, 0, 0, 0.9);
  }
}