/* ============================================================
   平博娱乐 · 赛讯 — 共享样式
   设计系统：深蓝控制台 × 银色印刷面板 × 橙色激活点
   ============================================================ */

/* ---------- Reset ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  min-height: 100vh;
  background: var(--color-silver-light);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

input,
button,
textarea,
select {
  font: inherit;
  color: inherit;
}

button {
  border: none;
  background: none;
  cursor: pointer;
}

ul,
ol {
  list-style: none;
}

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

address {
  font-style: normal;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-headline);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--color-ink);
}

table {
  border-collapse: collapse;
  width: 100%;
}

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* ---------- Design Tokens ---------- */
:root {
  --color-night: #0B1D3A;
  --color-night-deep: #122A4A;
  --color-silver: #C6D0D8;
  --color-silver-light: #EAF0F4;
  --color-paper: #F7FAFC;
  --color-accent: #FF6B35;
  --color-accent-hover: #FF8A5C;
  --color-ink: #102A43;
  --color-muted: #52606D;
  --color-success: #2E9E6B;

  --font-headline: "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Serif SC", "Source Han Serif SC", serif;
  --font-data: "JetBrains Mono", "Roboto Mono", monospace;

  --container-w: 1200px;
  --container-narrow-w: 760px;
  --container-wide-w: 1440px;
  --gap-page: clamp(1.25rem, 4vw, 3rem);

  --header-h: clamp(3.5rem, 6.5vw, 4rem);
  --announcement-h: clamp(2.5rem, 4.5vw, 3rem);
  --header-total: calc(var(--header-h) + var(--announcement-h));
  --toolbar-h: 3rem;

  --radius: 4px;
  --border-silver: 1px solid var(--color-silver);
  --shadow-panel: 0 2px 8px rgba(11, 29, 58, 0.06), 0 4px 24px rgba(11, 29, 58, 0.04);
  --shadow-panel-hover: 0 4px 16px rgba(11, 29, 58, 0.12), 0 8px 32px rgba(11, 29, 58, 0.08);
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;

  --font-h1: clamp(2rem, 4vw, 3.5rem);
  --font-h2: clamp(1.5rem, 2.5vw, 2.25rem);
  --font-h3: clamp(1.125rem, 1.5vw, 1.375rem);
}

/* ---------- Base Elements ---------- */
::selection {
  background: var(--color-accent);
  color: var(--color-ink);
}

@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}

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

/* ---------- Accessibility ---------- */
.visually-hidden {
  position: absolute;
  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;
  left: 1rem;
  top: -10rem;
  z-index: 2000;
  padding: 0.625rem 1.25rem;
  background: var(--color-accent);
  color: var(--color-ink);
  font-family: var(--font-headline);
  font-weight: 700;
  font-size: 0.875rem;
  border-radius: var(--radius);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.25);
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 0.75rem;
}

#main-content {
  scroll-margin-top: var(--header-total);
}

/* ============================================================
   头部
   ============================================================ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: transparent;
  transition: background var(--transition-base), box-shadow var(--transition-base);
}

.site-header[data-scrolled] {
  background: var(--color-night-deep);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.25);
}

/* --- 公告栏 --- */
.announcement-bar {
  min-height: var(--announcement-h);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.375rem 1.25rem;
  background: var(--color-night-deep);
  border-bottom: 1px solid rgba(198, 208, 216, 0.15);
  overflow: hidden;
  transition: min-height var(--transition-base), padding var(--transition-base), opacity var(--transition-base), border-width var(--transition-base);
}

.site-header[data-scrolled] .announcement-bar {
  min-height: 0;
  padding-top: 0;
  padding-bottom: 0;
  opacity: 0;
  border-bottom-width: 0;
}

.announcement-bar__text {
  font-family: var(--font-headline);
  font-size: 0.8rem;
  font-weight: 500;
  line-height: 1.5;
  text-align: center;
  color: var(--color-silver);
  letter-spacing: 0.02em;
}

.announcement-bar__hl {
  color: var(--color-accent);
  font-weight: 700;
}

/* --- 头部主行 --- */
.header-main {
  height: var(--header-h);
}

.header-main__inner {
  max-width: var(--container-w);
  margin: 0 auto;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  padding: 0 var(--gap-page);
}

/* --- 品牌 --- */
.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 0.375rem;
  flex-shrink: 0;
  color: var(--color-paper);
}

.brand__mark {
  font-family: var(--font-headline);
  font-size: 1.375rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--color-paper);
}

.brand__divider {
  font-family: var(--font-data);
  font-size: 1rem;
  color: var(--color-accent);
}

.brand__suffix {
  font-family: var(--font-headline);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--color-silver);
  text-transform: uppercase;
}

/* --- 导航 --- */
.nav__list {
  display: flex;
  align-items: center;
  gap: clamp(0.75rem, 2vw, 1.75rem);
}

.nav__link {
  position: relative;
  display: inline-block;
  padding: 0.375rem 0;
  font-family: var(--font-headline);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--color-paper);
  transition: color var(--transition-fast);
}

.nav__link:hover {
  color: var(--color-accent-hover);
}

.nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--transition-base);
}

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

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

.nav__link[aria-current="page"]::after {
  transform: scaleX(1);
}

/* --- 移动端导航按钮 --- */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 2.75rem;
  height: 2.75rem;
  border: 1px solid rgba(198, 208, 216, 0.35);
  border-radius: var(--radius);
  background: transparent;
  transition: border-color var(--transition-fast), background var(--transition-fast);
}

.nav-toggle:hover {
  border-color: var(--color-accent);
  background: rgba(255, 107, 53, 0.08);
}

.nav-toggle__bar {
  display: block;
  width: 1.25rem;
  height: 2px;
  background: var(--color-paper);
  border-radius: 1px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ============================================================
   页脚
   ============================================================ */
.site-footer {
  background: var(--color-night);
  color: var(--color-silver);
  padding-bottom: calc(var(--toolbar-h) + 0.5rem);
}

.footer-main {
  border-bottom: 1px solid rgba(198, 208, 216, 0.12);
}

.footer-main__inner {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: clamp(2.5rem, 5vw, 4.5rem) var(--gap-page);
  display: grid;
  grid-template-columns: 2fr 3fr;
  gap: clamp(2rem, 4vw, 4rem);
}

.footer-brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1rem;
}

.brand--footer .brand__mark {
  font-size: 1.5rem;
}

.footer-tagline {
  font-family: var(--font-headline);
  font-size: 0.875rem;
  font-weight: 500;
  line-height: 1.7;
  color: var(--color-silver);
  opacity: 0.85;
  max-width: 28rem;
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: 0.875rem;
}

.footer-col__title {
  font-family: var(--font-data);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-accent);
  padding-bottom: 0.375rem;
  border-bottom: 1px solid rgba(198, 208, 216, 0.18);
}

.footer-col__list {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.footer-link {
  display: inline-block;
  font-size: 0.875rem;
  color: var(--color-silver);
  line-height: 1.6;
  transition: color var(--transition-fast), transform var(--transition-fast);
}

.footer-link:hover {
  color: var(--color-accent-hover);
  transform: translateX(2px);
}

.footer-address {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.footer-address__line {
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--color-silver);
  opacity: 0.9;
}

.footer-address__line--note {
  margin-top: 0.375rem;
  font-family: var(--font-body);
  opacity: 0.7;
  font-size: 0.75rem;
  line-height: 1.5;
}

/* --- 页脚底部 --- */
.footer-bottom__inner {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 1.25rem var(--gap-page);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem 2rem;
  flex-wrap: wrap;
}

.footer-icp {
  font-family: var(--font-data);
  font-size: 0.75rem;
  color: var(--color-silver);
  opacity: 0.75;
  white-space: nowrap;
}

.footer-trust {
  font-size: 0.75rem;
  color: var(--color-silver);
  opacity: 0.65;
  line-height: 1.5;
}

/* --- 底部工具栏 --- */
.toolbar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 900;
  height: var(--toolbar-h);
  background: var(--color-night-deep);
  border-top: 1px solid rgba(198, 208, 216, 0.2);
  box-shadow: 0 -2px 12px rgba(0, 0, 0, 0.15);
}

.toolbar__inner {
  max-width: var(--container-w);
  margin: 0 auto;
  height: 100%;
  padding: 0 var(--gap-page);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.toolbar__status {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-data);
  font-size: 0.75rem;
  color: var(--color-success);
  white-space: nowrap;
}

.toolbar__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-success);
  box-shadow: 0 0 0 3px rgba(46, 158, 107, 0.2);
}

.toolbar__feedback {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.375rem 1.25rem;
  background: var(--color-accent);
  color: var(--color-ink);
  font-family: var(--font-headline);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  border-radius: 999px;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.toolbar__feedback:hover {
  background: var(--color-accent-hover);
  transform: scale(1.05);
}

/* ============================================================
   布局容器
   ============================================================ */
.container {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 var(--gap-page);
}

.container--narrow {
  max-width: var(--container-narrow-w);
}

.container--wide {
  max-width: var(--container-wide-w);
}

.stack {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

/* ---------- 页面首屏 ---------- */
.page-hero {
  min-height: 75vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: calc(var(--header-total) + clamp(1.5rem, 4vw, 3rem)) var(--gap-page) clamp(2rem, 5vw, 4rem);
  background: var(--color-night);
  color: var(--color-paper);
  position: relative;
  overflow: hidden;
}

.page-hero__title {
  font-size: var(--font-h1);
  color: var(--color-paper);
  margin-bottom: 0.75rem;
  max-width: 14em;
}

.page-hero__meta {
  font-family: var(--font-data);
  font-size: 0.875rem;
  color: var(--color-silver);
  letter-spacing: 0.04em;
  max-width: 36em;
}

/* ---------- 内容章节 ---------- */
.section {
  padding: clamp(3rem, 7vw, 5.5rem) var(--gap-page);
}

.section__label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-data);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 0.75rem;
}

.section__label::before {
  content: "";
  display: block;
  width: 1.5rem;
  height: 2px;
  background: var(--color-accent);
  flex-shrink: 0;
}

.section__title {
  font-size: var(--font-h2);
  margin-bottom: 0.75rem;
}

.section__body {
  color: var(--color-muted);
  max-width: 36em;
}

/* ============================================================
   按钮
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-family: var(--font-headline);
  font-weight: 700;
  font-size: 0.9375rem;
  line-height: 1.2;
  letter-spacing: 0.02em;
  text-decoration: none;
  cursor: pointer;
  transition: background var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast), box-shadow var(--transition-fast);
}

.btn--primary {
  background: var(--color-accent);
  color: var(--color-ink);
  box-shadow: 0 2px 8px rgba(255, 107, 53, 0.25);
}

.btn--primary:hover {
  background: var(--color-accent-hover);
  box-shadow: 0 4px 16px rgba(255, 107, 53, 0.35);
}

.btn--ghost {
  background: transparent;
  border-color: var(--color-silver);
  color: var(--color-paper);
}

.btn--ghost:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* ============================================================
   面包屑
   ============================================================ */
.breadcrumb {
  margin-bottom: 1.5rem;
}

.breadcrumb__list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.375rem;
}

.breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.8125rem;
  color: var(--color-muted);
}

.breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  font-family: var(--font-data);
  color: var(--color-silver);
}

.breadcrumb__link {
  color: var(--color-muted);
  transition: color var(--transition-fast);
}

.breadcrumb__link:hover {
  color: var(--color-accent);
}

.breadcrumb__current {
  color: var(--color-ink);
  font-weight: 600;
}

/* ============================================================
   面板
   ============================================================ */
.panel {
  position: relative;
  background: var(--color-paper);
  border: 1px solid var(--color-silver);
  border-radius: var(--radius);
  box-shadow: var(--shadow-panel);
  padding: clamp(1.25rem, 2.5vw, 2rem);
  transition: box-shadow var(--transition-base), border-color var(--transition-base);
}

.panel::before {
  content: "";
  position: absolute;
  top: -1px;
  left: -1px;
  width: 1.75rem;
  height: 1.75rem;
  border-top: 2px solid var(--color-accent);
  border-left: 2px solid var(--color-accent);
  border-radius: var(--radius) 0 0 0;
  pointer-events: none;
}

.panel:hover {
  box-shadow: var(--shadow-panel-hover);
  border-color: var(--color-silver);
}

.panel--deep {
  background: var(--color-night);
  border-color: var(--color-night-deep);
  color: var(--color-paper);
}

.panel--deep .panel__header,
.panel--deep .panel__body,
.panel--deep .panel__footer {
  color: var(--color-paper);
}

.panel--deep h1,
.panel--deep h2,
.panel--deep h3 {
  color: var(--color-paper);
}

.panel__header {
  margin-bottom: 1rem;
  font-family: var(--font-headline);
  font-size: var(--font-h3);
  font-weight: 800;
}

.panel__body {
  color: var(--color-muted);
  line-height: 1.7;
}

.panel__footer {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--color-silver);
}

/* ============================================================
   卡片
   ============================================================ */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.card {
  background: var(--color-paper);
  border: 1px solid var(--color-silver);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow-panel);
  transition: box-shadow var(--transition-base), transform var(--transition-base), border-color var(--transition-base);
}

.card:hover {
  box-shadow: var(--shadow-panel-hover);
  transform: translateY(-3px);
  border-color: var(--color-silver);
}

.card__title {
  font-family: var(--font-headline);
  font-size: 1.125rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
}

.card__meta {
  font-family: var(--font-data);
  font-size: 0.75rem;
  color: var(--color-muted);
  letter-spacing: 0.04em;
  margin-bottom: 0.875rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.card__body {
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--color-muted);
}

/* ============================================================
   数据表格
   ============================================================ */
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-data);
  font-size: 0.875rem;
  background: var(--color-paper);
  border: 1px solid var(--color-silver);
  border-radius: var(--radius);
  overflow: hidden;
}

.data-table th,
.data-table td {
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--color-silver-light);
}

.data-table th {
  background: var(--color-night);
  color: var(--color-paper);
  font-weight: 600;
  letter-spacing: 0.06em;
  font-size: 0.8125rem;
}

.data-table tr:last-child td {
  border-bottom: none;
}

.data-table tbody tr:nth-child(even) {
  background: var(--color-silver-light);
}

.data-table tbody tr {
  transition: background var(--transition-fast);
}

.data-table tbody tr:hover {
  background: var(--color-paper);
}

/* ============================================================
   状态面板
   ============================================================ */
.status-panel {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1rem;
}

.status-item {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(198, 208, 216, 0.15);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  transition: border-color var(--transition-fast), background var(--transition-fast);
}

.status-item:hover {
  border-color: rgba(255, 107, 53, 0.5);
  background: rgba(255, 255, 255, 0.06);
}

.status-item__label {
  font-family: var(--font-data);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-silver);
  opacity: 0.8;
  display: flex;
  align-items: center;
  gap: 0.375rem;
}

.status-item__value {
  font-family: var(--font-data);
  font-size: 1.375rem;
  font-weight: 400;
  color: var(--color-paper);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.03em;
}

.status-item__indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-success);
  flex-shrink: 0;
}

/* ============================================================
   标签
   ============================================================ */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.25rem 0.75rem;
  border: 1px solid;
  border-radius: 999px;
  font-family: var(--font-headline);
  font-size: 0.75rem;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: 0.03em;
  white-space: nowrap;
}

.tag--price {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: rgba(255, 107, 53, 0.08);
}

.tag--status {
  border-color: var(--color-silver);
  color: var(--color-muted);
  background: var(--color-silver-light);
}

.tag--sync {
  border-color: rgba(46, 158, 107, 0.5);
  color: var(--color-success);
  background: rgba(46, 158, 107, 0.06);
}

/* ============================================================
   图片容器
   ============================================================ */
.image-frame {
  position: relative;
  overflow: hidden;
  background: var(--color-night-deep);
  border-radius: var(--radius);
  border: 1px solid var(--color-silver);
}

.image-frame::before {
  content: "";
  display: block;
  padding-top: 56.25%;
}

.image-frame__placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-data);
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-silver);
  background:
    linear-gradient(45deg, transparent 48%, var(--color-silver) 49%, var(--color-silver) 51%, transparent 52%),
    linear-gradient(-45deg, transparent 48%, var(--color-silver) 49%, var(--color-silver) 51%, transparent 52%);
  background-size: 1.25rem 1.25rem;
  background-color: var(--color-night-deep);
  opacity: 0.7;
}

/* ---------- 滚动显现 ---------- */
[data-reveal] {
  transition: opacity 400ms ease, transform 400ms ease;
}

html.reveal-ready [data-reveal]:not([data-revealed]) {
  opacity: 0;
  transform: translateY(1rem);
}

[data-reveal][data-revealed] {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1023px) and (min-width: 768px) {
  .footer-main__inner {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

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

  .nav__list {
    gap: 1rem;
  }
}

@media (max-width: 767px) {
  .header-main__inner {
    gap: 1rem;
  }

  .brand__mark {
    font-size: 1.125rem;
  }

  .brand__divider {
    font-size: 0.875rem;
  }

  .brand__suffix {
    font-size: 0.75rem;
  }

  /* --- 移动端导航面板 --- */
  .nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    background: var(--color-night-deep);
    border-bottom: 1px solid rgba(198, 208, 216, 0.18);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
  }

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

  .nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0.5rem var(--gap-page) 1rem;
  }

  .nav__item {
    border-bottom: 1px solid rgba(198, 208, 216, 0.1);
  }

  .nav__item:last-child {
    border-bottom: none;
  }

  .nav__link {
    display: block;
    padding: 0.875rem 0.25rem;
    font-size: 1rem;
    color: var(--color-paper);
  }

  .nav__link::after {
    display: none;
  }

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

  .nav-toggle {
    display: flex;
  }

  /* --- 页脚移动端 --- */
  .footer-main__inner {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .footer-nav {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .footer-bottom__inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }

  .toolbar__status {
    font-size: 0.6875rem;
  }

  .toolbar__feedback {
    padding: 0.3125rem 1rem;
    font-size: 0.75rem;
  }
}

@media (min-width: 768px) {
  .nav {
    display: block;
  }
}