:root {
  --color-surface: #fafafa;
  --color-surface-alt: #f2f1f2;
  --color-surface-deep: #e6e4e6;
  --color-ink: #524554;
  --color-ink-soft: #7b697c;
  --color-ink-muted: #877689;
  --color-line: #dcd9dc;
  --color-primary: #b242bd;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #f0e0f1;
  --color-accent: #8725da;
  --color-accent-ink: #ffffff;
  --color-highlight: #e5d4f4;
  --color-focus: #8818e7;
  --color-contrast-surface: #211622;
  --color-contrast-ink: #e7e4e7;
  --color-contrast-line: #4d434d;
  --color-contrast-accent: #a962e4;
  --overlay-scrim: linear-gradient(180deg, rgba(33, 22, 34, 0.35) 0%, rgba(33, 22, 34, 0.72) 55%, rgba(33, 22, 34, 0.92) 100%);
  --font-heading: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-body: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --text-xs: 11.0px;
  --text-sm: 14.7px;
  --text-base: 17px;
  --text-lg: 22.7px;
  --text-xl: 30.2px;
  --text-2xl: 40.3px;
  --text-3xl: 53.7px;
  --text-4xl: 71.5px;
  --text-display: clamp(34px, 6.4vw, 82px);
  --text-figure: clamp(28px, 4.6vw, 59px);
  --weight-heading: 732;
  --weight-body: 400;
  --leading-body: 1.75;
  --leading-heading: 1.25;
  --tracking-heading: -0.009em;
  --radius-sm: 14px;
  --radius-md: 14px;
  --radius-lg: 15px;
  --radius-pill: 999px;
  --border-thin: 1px;
  --border-thick: 1px;
  --shadow-1: 0 6px 18px rgba(82, 69, 84, 0.08);
  --shadow-2: 0 18px 44px rgba(82, 69, 84, 0.14);
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1220px;
  --measure: 70ch;
  --gutter: 32px;
  --section-y: 82px;
  --section-y-lg: 115px;
}

/* ==========================================================================
   1. 重置与基础
   ========================================================================== */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 132px;
}

body {
  margin: 0;
  background-color: var(--color-surface);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-body);
  line-height: var(--leading-body);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

img {
  height: auto;
}

button {
  font: inherit;
  color: inherit;
}

address {
  font-style: normal;
}

/* ==========================================================================
   2. 中文排版
   ========================================================================== */
h1,
h2,
h3,
h4,
h5,
h6 {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  text-wrap: balance;
}

h1 {
  font-size: var(--text-2xl);
}

h2 {
  font-size: var(--text-xl);
}

h3 {
  font-size: var(--text-lg);
}

h4 {
  font-size: var(--text-base);
}

p {
  margin: 0;
}

p + p {
  margin-top: var(--space-2);
}

ul[class],
ol[class] {
  margin: 0;
  padding: 0;
  list-style: none;
}

strong {
  font-weight: 700;
  color: color-mix(in srgb, var(--color-ink) 88%, var(--color-accent));
}

figure {
  margin: 0;
}

blockquote {
  margin: var(--space-4) 0;
  padding: var(--space-3) var(--space-4);
  border-left: 3px solid var(--color-primary);
  border-radius: var(--radius-sm);
  background-color: var(--color-primary-soft);
  color: var(--color-ink);
}

hr {
  border: 0;
  height: var(--border-thin);
  background-color: var(--color-line);
  margin: var(--space-6) 0;
}

/* ==========================================================================
   3. 链接与焦点
   ========================================================================== */
a {
  color: var(--color-accent);
  text-decoration: none;
  text-underline-offset: 5px;
  text-decoration-thickness: 2px;
  transition: color 0.2s ease, background-color 0.2s ease, box-shadow 0.2s ease;
}

a:hover {
  color: color-mix(in srgb, var(--color-accent) 62%, var(--color-primary));
  text-decoration: underline;
}

a:focus-visible,
button:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 3px;
  border-radius: 4px;
}

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

/* ==========================================================================
   4. 布局工具
   ========================================================================== */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section,
.band {
  padding-block: var(--section-y);
}

.band--alt {
  background-color: var(--color-surface-alt);
}

.band--deep {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.band--deep :is(h1, h2, h3, h4, h5, h6) {
  color: var(--color-contrast-ink);
}

.band--deep a {
  color: var(--color-contrast-accent);
}

.band--deep a:hover {
  color: color-mix(in srgb, var(--color-contrast-accent) 70%, var(--color-contrast-ink));
}

.band--deep :is(.btn--ghost, .btn--soft) {
  background-color: color-mix(in srgb, var(--color-contrast-ink) 10%, transparent);
  border-color: var(--color-contrast-line);
  color: var(--color-contrast-ink);
}

.band--offset > .container {
  position: relative;
}

.band--offset > .container::before {
  content: "";
  position: absolute;
  top: calc(var(--space-4) * -1);
  right: calc(var(--gutter) - var(--space-1));
  width: min(220px, 34%);
  height: var(--space-1);
  border-radius: var(--radius-pill);
  background-image: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  pointer-events: none;
}

.grid {
  display: grid;
  gap: var(--gutter);
}

.grid--auto-2 {
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 320px), 1fr));
}

.grid--auto-3 {
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 268px), 1fr));
}

.grid--tight {
  gap: var(--space-3);
}

.flow > * + * {
  margin-top: var(--space-3);
}

.stack-1 > * + * {
  margin-top: var(--space-1);
}

.stack-2 > * + * {
  margin-top: var(--space-2);
}

.prose {
  max-width: var(--measure);
}

.prose p + p {
  margin-top: var(--space-2);
}

.section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
}

.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

.lead {
  font-size: var(--text-lg);
  line-height: 1.6;
  color: var(--color-ink-soft);
  max-width: var(--measure);
}

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

/* ==========================================================================
   5. 按钮
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  padding: 12px var(--space-3);
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-pill);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 600;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  white-space: nowrap;
}

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

.btn--primary {
  background-image: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: var(--color-primary-ink);
  box-shadow: var(--shadow-1);
}

.btn--primary:hover {
  color: var(--color-primary-ink);
  box-shadow: var(--shadow-2);
}

.btn--ghost {
  background-color: color-mix(in srgb, var(--color-surface) 78%, transparent);
  border-color: var(--color-line);
  color: var(--color-ink);
}

.btn--ghost:hover {
  color: var(--color-accent);
  border-color: color-mix(in srgb, var(--color-accent) 42%, var(--color-line));
}

.btn--soft {
  background-color: var(--color-primary-soft);
  color: color-mix(in srgb, var(--color-accent) 78%, var(--color-ink));
}

.btn--soft:hover {
  color: var(--color-accent);
  background-color: color-mix(in srgb, var(--color-highlight) 80%, var(--color-primary-soft));
}

/* ==========================================================================
   6. 标签、数据与卡片
   ========================================================================== */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border-radius: var(--radius-pill);
  background-color: var(--color-primary-soft);
  color: color-mix(in srgb, var(--color-accent) 76%, var(--color-ink));
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.chip--data {
  font-family: var(--font-mono);
  background-color: var(--color-surface-deep);
  color: var(--color-ink-soft);
}

.band--deep .chip {
  background-color: color-mix(in srgb, var(--color-contrast-accent) 22%, transparent);
  color: var(--color-contrast-ink);
}

.status-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-image: linear-gradient(135deg, var(--color-primary), var(--color-accent));
}

.stat {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-3);
  border-radius: var(--radius-lg);
  background-color: color-mix(in srgb, var(--color-surface) 70%, transparent);
  border: var(--border-thin) solid var(--color-line);
}

.stat__value {
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: 600;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: color-mix(in srgb, var(--color-accent) 74%, var(--color-primary));
  font-variant-numeric: tabular-nums;
}

.stat__label {
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

.band--deep .stat {
  background-color: color-mix(in srgb, var(--color-contrast-ink) 6%, transparent);
  border-color: var(--color-contrast-line);
}

.band--deep .stat__value {
  color: var(--color-contrast-accent);
}

.band--deep .stat__label {
  color: color-mix(in srgb, var(--color-contrast-ink) 78%, transparent);
}

.card {
  position: relative;
  padding: var(--space-4);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  background-color: var(--color-surface);
  box-shadow: var(--shadow-1);
}

.card--gradient {
  border-color: transparent;
  background-image:
    radial-gradient(120% 130% at 6% 0%, color-mix(in srgb, var(--color-primary) 18%, transparent) 0%, transparent 60%),
    linear-gradient(160deg, var(--color-primary-soft) 0%, var(--color-surface) 72%);
}

.card--raised {
  box-shadow: var(--shadow-2);
}

.card__title {
  font-size: var(--text-lg);
  margin-bottom: var(--space-1);
}

.card__meta {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  letter-spacing: 0.04em;
}

.panel-deep {
  padding: var(--space-6);
  border-radius: var(--radius-lg);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  background-image:
    radial-gradient(90% 130% at 10% 0%, color-mix(in srgb, var(--color-contrast-accent) 26%, transparent) 0%, transparent 58%),
    radial-gradient(80% 120% at 94% 100%, color-mix(in srgb, var(--color-primary) 24%, transparent) 0%, transparent 56%);
  box-shadow: var(--shadow-2);
}

.panel-deep :is(h1, h2, h3, h4) {
  color: var(--color-contrast-ink);
}

.panel-deep a {
  color: var(--color-contrast-accent);
}

/* ==========================================================================
   7. 图片容器（去边直角 + 遮罩协议）
   ========================================================================== */
.media-frame {
  position: relative;
  display: block;
  width: 100%;
  overflow: hidden;
  border-radius: 0;
  background-color: var(--color-surface-deep);
  isolation: isolate;
}

.media-frame > img,
.media-frame > picture > img,
.media-frame > video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame--wide {
  aspect-ratio: 16 / 9;
}

.media-frame--tall {
  aspect-ratio: 4 / 5;
}

.media-frame--square {
  aspect-ratio: 1 / 1;
}

.media-frame--soft {
  border-radius: var(--radius-lg);
}

.media-frame--placeholder::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(135deg, color-mix(in srgb, var(--color-primary) 12%, transparent) 0 1px, transparent 1px 16px),
    radial-gradient(90% 90% at 20% 10%, color-mix(in srgb, var(--color-primary) 26%, transparent) 0%, transparent 62%),
    radial-gradient(80% 80% at 88% 86%, color-mix(in srgb, var(--color-accent) 22%, transparent) 0%, transparent 60%),
    linear-gradient(160deg, var(--color-primary-soft) 0%, var(--color-surface-deep) 100%);
}

.media-frame__scrim {
  position: absolute;
  inset: 0;
  z-index: 1;
  background-image: var(--overlay-scrim);
  pointer-events: none;
}

.media-frame__caption {
  position: absolute;
  inset-inline: var(--space-3);
  bottom: var(--space-3);
  z-index: 2;
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
  line-height: 1.55;
}

/* ==========================================================================
   8. 强调、分隔与索引
   ========================================================================== */
.mark {
  color: inherit;
  text-decoration: underline;
  text-decoration-color: var(--color-accent);
  text-decoration-thickness: 3px;
  text-underline-offset: 6px;
}

.mark--block {
  padding: 0 0.28em;
  border-radius: 6px;
  background-color: var(--color-highlight);
  color: color-mix(in srgb, var(--color-accent) 82%, var(--color-ink));
  text-decoration: none;
}

.band--deep .mark--block {
  background-color: color-mix(in srgb, var(--color-contrast-accent) 26%, transparent);
  color: var(--color-contrast-ink);
}

.offset-rule {
  position: relative;
  height: var(--border-thin);
  margin-block: var(--space-8);
  background-color: var(--color-line);
}

.offset-rule::before {
  content: "";
  position: absolute;
  left: 0;
  top: -3px;
  width: 96px;
  height: 7px;
  border-radius: var(--radius-pill);
  background-image: linear-gradient(90deg, var(--color-primary), var(--color-accent));
}

.offset-rule::after {
  content: "";
  position: absolute;
  right: 0;
  top: -2px;
  width: 34%;
  height: 5px;
  border-radius: var(--radius-pill);
  background-color: var(--color-surface-alt);
}

.breadcrumb {
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
}

.breadcrumb__list li + li::before {
  content: "/";
  margin-right: 6px;
  color: var(--color-ink-muted);
}

.breadcrumb__list [aria-current="page"] {
  color: var(--color-ink-muted);
}

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

.data-table caption {
  text-align: left;
  padding-bottom: var(--space-2);
  color: var(--color-ink-muted);
  font-size: var(--text-xs);
  font-family: var(--font-mono);
  letter-spacing: 0.08em;
}

.data-table th,
.data-table td {
  text-align: left;
  vertical-align: top;
  padding: var(--space-2) var(--space-3);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.data-table th {
  font-family: var(--font-heading);
  font-weight: 600;
  color: var(--color-ink-soft);
  white-space: nowrap;
}

.band--deep .data-table th,
.band--deep .data-table td {
  border-bottom-color: var(--color-contrast-line);
}

/* ==========================================================================
   9. 切换区
   ========================================================================== */
.tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tab {
  padding: 9px var(--space-2);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background-color: var(--color-surface);
  color: var(--color-ink-soft);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 600;
  cursor: pointer;
  transition: color 0.2s ease, background-color 0.2s ease, border-color 0.2s ease;
}

.tab:hover {
  color: var(--color-accent);
  border-color: color-mix(in srgb, var(--color-accent) 38%, var(--color-line));
}

.tab[aria-selected="true"],
.tab.is-active {
  border-color: transparent;
  background-image: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: var(--color-primary-ink);
  box-shadow: var(--shadow-1);
}

[data-tab-panel] {
  margin-top: var(--space-4);
}

[data-tab-panel][hidden] {
  display: none;
}

/* ==========================================================================
   10. 显现、进度与回到顶部
   ========================================================================== */
[data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition:
    opacity 0.6s ease var(--reveal-delay, 0ms),
    transform 0.6s cubic-bezier(0.22, 0.61, 0.36, 1) var(--reveal-delay, 0ms);
  will-change: opacity, transform;
}

[data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

.to-top {
  position: fixed;
  right: var(--space-3);
  bottom: var(--space-3);
  z-index: 70;
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  padding: 0;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background-color: var(--color-surface);
  color: var(--color-accent);
  font-size: var(--text-lg);
  line-height: 1;
  box-shadow: var(--shadow-2);
  cursor: pointer;
  opacity: 0;
  transform: translateY(12px);
  pointer-events: none;
  transition: opacity 0.25s ease, transform 0.25s ease, color 0.2s ease;
}

.to-top[data-visible] {
  opacity: 1;
  transform: none;
  pointer-events: auto;
}

.to-top:hover {
  color: var(--color-primary);
}

.to-top__icon {
  display: block;
  line-height: 1;
}

/* ==========================================================================
   11. 页头
   ========================================================================== */
.skip-link {
  position: absolute;
  left: var(--space-2);
  top: -80px;
  z-index: 120;
  padding: 10px var(--space-3);
  border-radius: var(--radius-pill);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
  font-weight: 600;
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: var(--space-2);
  text-decoration: none;
  color: var(--color-contrast-ink);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background-color: color-mix(in srgb, var(--color-surface) 92%, transparent);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.progress-rail {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  z-index: 2;
  height: 3px;
  overflow: hidden;
  pointer-events: none;
  background-color: color-mix(in srgb, var(--color-line) 40%, transparent);
}

.progress-rail__bar {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background-image: linear-gradient(90deg, var(--color-primary), var(--color-accent));
}

.header-top {
  background-image:
    radial-gradient(70% 220% at 6% 0%, color-mix(in srgb, var(--color-primary) 17%, transparent) 0%, transparent 62%),
    linear-gradient(100deg,
      color-mix(in srgb, var(--color-primary-soft) 78%, var(--color-surface)) 0%,
      color-mix(in srgb, var(--color-highlight) 46%, var(--color-surface)) 48%,
      var(--color-surface) 100%);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.header-top__inner {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  min-height: 68px;
  padding-block: var(--space-2);
}

.brand {
  flex: 0 1 auto;
  min-width: 0;
}

.brand__link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  min-width: 0;
  color: var(--color-ink);
}

.brand__link:hover {
  text-decoration: none;
  color: var(--color-ink);
}

.brand__mark {
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  background-image: linear-gradient(145deg, var(--color-primary), var(--color-accent));
  color: var(--color-primary-ink);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: 1;
  box-shadow: var(--shadow-1);
}

.brand__text {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.brand__name {
  font-family: var(--font-heading);
  font-size: calc(var(--text-base) * 1.12);
  font-weight: var(--weight-heading);
  line-height: 1.2;
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.brand__line {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.01em;
  color: var(--color-ink-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.header-top__path {
  flex: 1 1 auto;
  min-width: 0;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  text-align: right;
  padding-inline-end: var(--space-2);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.header-top__cta {
  flex: 0 0 auto;
  margin-inline-start: auto;
}

.header-nav {
  position: relative;
}

.header-nav__inner {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  min-height: 54px;
}

.primary-nav {
  flex: 1 1 auto;
  min-width: 0;
}

.primary-nav__list {
  display: flex;
  align-items: center;
  gap: 4px;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
  padding-block: 6px;
}

.primary-nav__list::-webkit-scrollbar {
  display: none;
}

.primary-nav__link {
  position: relative;
  display: block;
  padding: 8px 14px;
  border-radius: var(--radius-pill);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-ink-soft);
  white-space: nowrap;
}

.primary-nav__link::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 3px;
  height: 2px;
  border-radius: var(--radius-pill);
  background-image: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 0.28s cubic-bezier(0.22, 0.61, 0.36, 1);
}

.primary-nav__link:hover {
  color: var(--color-ink);
  background-color: color-mix(in srgb, var(--color-primary-soft) 62%, transparent);
  text-decoration: none;
}

.primary-nav__link:hover::after {
  transform: scaleX(1);
}

.primary-nav__link[aria-current="page"] {
  color: var(--color-primary-ink);
  background-image: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  box-shadow: var(--shadow-1);
}

.primary-nav__link[aria-current="page"]::after {
  display: none;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: var(--space-1);
  padding: 10px var(--space-2);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background-color: var(--color-surface);
  color: var(--color-ink);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 600;
  cursor: pointer;
}

.nav-toggle__bars {
  position: relative;
  width: 18px;
  height: 12px;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  border-radius: 2px;
  background-image: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  transition: transform 0.25s ease, top 0.25s ease;
}

.nav-toggle__bars::before {
  top: 0;
}

.nav-toggle__bars::after {
  top: 10px;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before {
  top: 5px;
  transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after {
  top: 5px;
  transform: rotate(-45deg);
}

/* ==========================================================================
   12. 页脚（阶梯式）
   ========================================================================== */
.site-footer {
  margin-top: var(--section-y);
  background-color: var(--color-surface);
}

.footer-upper {
  padding-block: var(--section-y);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  background-image:
    radial-gradient(80% 130% at 10% 0%, color-mix(in srgb, var(--color-contrast-accent) 26%, transparent) 0%, transparent 58%),
    radial-gradient(70% 110% at 94% 100%, color-mix(in srgb, var(--color-primary) 24%, transparent) 0%, transparent 56%);
}

.footer-upper__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.4fr) minmax(0, 1fr);
  gap: var(--space-6);
}

.footer-brand__name {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: 1.25;
  color: var(--color-contrast-ink);
}

.footer-brand__line {
  margin-top: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.03em;
  color: color-mix(in srgb, var(--color-contrast-ink) 70%, transparent);
}

.footer-index__title {
  margin-bottom: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: color-mix(in srgb, var(--color-contrast-ink) 58%, transparent);
}

.footer-index__list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 150px), 1fr));
  gap: 2px var(--space-3);
}

.footer-index__list a {
  display: inline-block;
  padding: 6px 0;
  font-size: var(--text-sm);
  color: var(--color-contrast-ink);
}

.footer-index__list a:hover {
  color: var(--color-contrast-accent);
}

.footer-status__list {
  display: grid;
  gap: 0;
}

.footer-status__item {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-2);
  padding-block: 10px;
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
  font-size: var(--text-sm);
}

.footer-status__label {
  color: color-mix(in srgb, var(--color-contrast-ink) 74%, transparent);
}

.footer-status__value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  color: var(--color-contrast-accent);
}

.footer-lower {
  padding-block: var(--space-6);
  background-color: var(--color-surface-alt);
  border-top: var(--border-thin) solid var(--color-line);
}

.footer-lower__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr);
  gap: var(--space-4);
  align-items: start;
}

.footer-legal__list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  font-size: var(--text-sm);
}

.footer-copy {
  margin-top: var(--space-2);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}

.footer-contact {
  display: grid;
  gap: 4px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-soft);
}

.footer-note {
  margin-top: var(--space-2);
  max-width: var(--measure);
  font-size: var(--text-xs);
  line-height: 1.7;
  color: var(--color-ink-muted);
}

/* ==========================================================================
   13. 响应式
   ========================================================================== */
@media (min-width: 1024px) {
  .section,
  .band {
    padding-block: var(--section-y-lg);
  }
}

@media (max-width: 1080px) {
  .header-top__path {
    display: none;
  }
}

@media (max-width: 1000px) {
  .footer-upper__inner {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }
}

@media (max-width: 900px) {
  html {
    scroll-padding-top: 118px;
  }

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

  .header-nav__inner {
    justify-content: space-between;
    padding-block: var(--space-1);
  }

  .primary-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    z-index: 70;
    display: none;
    max-height: 72vh;
    overflow-y: auto;
    padding: var(--space-2) var(--gutter) var(--space-3);
    background-color: var(--color-surface);
    border-bottom: var(--border-thin) solid var(--color-line);
    box-shadow: var(--shadow-2);
  }

  .primary-nav[data-open] {
    display: block;
  }

  .primary-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    overflow: visible;
    padding-block: 0;
  }

  .primary-nav__link {
    padding: 12px var(--space-2);
    border-radius: var(--radius-sm);
    font-size: var(--text-base);
  }

  .primary-nav__link::after {
    display: none;
  }

  .primary-nav__link[aria-current="page"] {
    color: var(--color-primary-ink);
  }

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

@media (max-width: 700px) {
  .footer-upper__inner {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--space-4);
  }

  .offset-rule {
    margin-block: var(--space-6);
  }
}

@media (max-width: 620px) {
  .container {
    padding-inline: var(--space-2);
  }

  .brand__line {
    display: none;
  }

  .header-top__inner {
    min-height: 60px;
    gap: var(--space-2);
  }

  .header-top__cta {
    padding: 10px var(--space-2);
  }

  .primary-nav {
    padding-inline: var(--space-2);
  }

  .band--offset > .container::before {
    right: var(--space-2);
    width: 40%;
  }

  .to-top {
    right: var(--space-2);
    bottom: var(--space-2);
  }
}

/* ==========================================================================
   14. 减少动效
   ========================================================================== */
@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;
  }

  [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
  }

  .primary-nav__link::after {
    transform: scaleX(1);
  }
}