/* =========================================================
   九博国际娱乐 · 共享站点样式 /assets/site.css
   画框式导航 + 纵向长卷 + 编辑部标签语言
   ========================================================= */

:root {
  /* 色彩 */
  --c-space: #0B1B33;
  --c-night: #12294A;
  --c-teal: #35D0C0;
  --c-elec: #7FF3E4;
  --c-amber: #E8A33D;
  --c-amber-lit: #F2B45C;
  --c-paper: #F4F1EA;
  --c-mist: #8FA3BF;
  --c-tianshan: #C9D4E2;
  --c-ink: #06101F;
  --c-legacy: #C96A52;
  --c-paper-ink: #1B2434;

  /* 线与框 */
  --line: 1px solid rgba(201, 212, 226, 0.18);
  --line-strong: 1px solid rgba(201, 212, 226, 0.34);
  --line-teal: 1px solid rgba(53, 208, 192, 0.42);

  /* 度量 */
  --rail: 76px;
  --shell: 1360px;
  --radius: 2px;
  --gutter: clamp(18px, 4vw, 48px);

  /* 字体族 */
  --font-display: "Barlow Condensed", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-serif: "Noto Serif SC", "Songti SC", "SimSun", serif;
  --font-body: "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  /* 缓动 */
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 32px;
}

body {
  margin: 0;
  background: var(--c-space);
  color: var(--c-paper);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.85;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, p, ul, ol, figure, blockquote {
  margin: 0;
}

ul, ol {
  padding: 0;
  list-style: none;
}

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

button {
  font: inherit;
  color: inherit;
}

a {
  color: var(--c-teal);
  text-decoration: none;
  transition: color 0.16s var(--ease);
}

a:hover {
  color: var(--c-elec);
}

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

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

/* ---------- 基础排版 ---------- */
h1, h2 {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.02;
  color: var(--c-paper);
}

h1 { font-size: clamp(2.2rem, 4.6vw, 3.6rem); }
h2 { font-size: clamp(1.6rem, 3vw, 2.125rem); }

h3 {
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 1.25rem;
  line-height: 1.4;
  letter-spacing: 0;
  color: var(--c-paper);
}

h4 {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-mist);
}

p {
  color: var(--c-tianshan);
}

strong {
  color: var(--c-paper);
  font-weight: 700;
}

/* ---------- 通用原子 ---------- */
.container {
  width: 100%;
  max-width: 1200px;
  margin-inline: auto;
  padding-inline: clamp(20px, 5vw, 64px);
}

.container--narrow {
  max-width: 820px;
}

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

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-teal);
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: currentColor;
  opacity: 0.7;
}

.mono {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--c-mist);
}

.rule {
  display: block;
  height: 1px;
  border: 0;
  margin: 0;
  background: linear-gradient(90deg, rgba(201, 212, 226, 0.32), rgba(201, 212, 226, 0.04));
}

/* 标签 */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  border-radius: var(--radius);
  border: 1px solid rgba(53, 208, 192, 0.42);
  background: rgba(53, 208, 192, 0.08);
  color: var(--c-teal);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  white-space: nowrap;
}

.tag--amber {
  border-color: rgba(232, 163, 61, 0.5);
  background: rgba(232, 163, 61, 0.1);
  color: var(--c-amber);
}

.tag--legacy {
  border-style: dashed;
  border-color: rgba(201, 106, 82, 0.6);
  background: rgba(201, 106, 82, 0.1);
  color: var(--c-legacy);
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 22px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: 0.94rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.4;
  text-decoration: none;
  cursor: pointer;
  transition: background 0.16s var(--ease), color 0.16s var(--ease),
              border-color 0.16s var(--ease), transform 0.16s var(--ease);
}

.btn--primary {
  background: var(--c-amber);
  color: var(--c-ink);
}

.btn--primary:hover,
.btn--primary:focus-visible {
  background: var(--c-amber-lit);
  color: var(--c-ink);
}

.btn--ghost {
  border-color: rgba(53, 208, 192, 0.45);
  color: var(--c-teal);
  background: transparent;
}

.btn--ghost:hover,
.btn--ghost:focus-visible {
  border-color: var(--c-teal);
  background: rgba(53, 208, 192, 0.1);
  color: var(--c-elec);
}

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

/* 面包屑 */
.breadcrumb {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-mist);
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: baseline;
}

.breadcrumb a {
  color: var(--c-mist);
  border-bottom: 1px solid transparent;
}

.breadcrumb a:hover,
.breadcrumb a:focus-visible {
  color: var(--c-teal);
  border-bottom-color: rgba(53, 208, 192, 0.55);
}

.breadcrumb li + li::before {
  content: "/";
  margin-inline-end: 8px;
  color: rgba(143, 163, 191, 0.45);
}

/* 纸页区块 */
.panel {
  position: relative;
  padding: clamp(20px, 3vw, 34px);
  background: var(--c-night);
  border: var(--line);
  border-radius: var(--radius);
  box-shadow: 0 18px 48px -32px rgba(6, 16, 31, 0.9);
}

/* ---------- 可复用图片容器 ---------- */
.media {
  position: relative;
  display: block;
  width: 100%;
  overflow: hidden;
  border: var(--line);
  border-radius: var(--radius);
  aspect-ratio: 16 / 9;
  background:
    repeating-linear-gradient(90deg, rgba(53, 208, 192, 0.07) 0 1px, transparent 1px 16px),
    linear-gradient(150deg, #12294A 0%, #0B1B33 62%, #06101F 100%);
}

.media > img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(6, 16, 31, 0) 52%, rgba(6, 16, 31, 0.58) 100%);
}

.media--plain::after { content: none; }
.media--wide { aspect-ratio: 21 / 9; }
.media--square { aspect-ratio: 1 / 1; }
.media--tall { aspect-ratio: 3 / 4; }

.media__caption {
  margin-block-start: 10px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  line-height: 1.8;
  color: var(--c-mist);
}

/* =========================================================
   头部
   ========================================================= */
.site-header {
  position: relative;
  z-index: 60;
  background: var(--c-space);
}

.skip-link {
  position: fixed;
  top: -80px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 200;
  padding: 12px 22px;
  background: var(--c-amber);
  color: var(--c-ink);
  font-weight: 700;
  font-size: 0.92rem;
  border-radius: var(--radius);
  text-decoration: none;
  transition: top 0.18s var(--ease);
}

.skip-link:focus {
  top: 14px;
  color: var(--c-ink);
}

.scroll-meter {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 1px;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--c-teal), var(--c-elec) 55%, var(--c-amber));
  z-index: 120;
  pointer-events: none;
}

.header-edge {
  position: fixed;
  inset-inline: 0;
  top: 0;
  height: 1px;
  z-index: 110;
  pointer-events: none;
  background: linear-gradient(
    90deg,
    rgba(201, 212, 226, 0) 0%,
    rgba(201, 212, 226, 0.5) 10%,
    rgba(201, 212, 226, 0.5) 90%,
    rgba(201, 212, 226, 0) 100%
  );
}

.header-bar {
  position: relative;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 15px var(--gutter);
  border-bottom: var(--line);
  background: linear-gradient(180deg, rgba(18, 41, 74, 0.55), rgba(11, 27, 51, 0));
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: 1 1 auto;
  min-width: 0;
  color: var(--c-paper);
  text-decoration: none;
}

.brand:hover,
.brand:focus-visible {
  color: var(--c-paper);
}

.brand:hover .brand-mark {
  border-color: var(--c-teal);
  background: linear-gradient(150deg, rgba(53, 208, 192, 0.22), rgba(53, 208, 192, 0.02) 70%);
}

.brand-mark {
  position: relative;
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border: 1px solid rgba(53, 208, 192, 0.45);
  border-radius: var(--radius);
  background: linear-gradient(150deg, rgba(53, 208, 192, 0.12), rgba(53, 208, 192, 0) 70%);
  transition: border-color 0.16s var(--ease), background 0.16s var(--ease);
}

.brand-mark::before {
  content: "";
  width: 19px;
  height: 11px;
  background: var(--c-teal);
  clip-path: polygon(0% 100%, 27% 32%, 46% 62%, 68% 0%, 100% 100%);
  opacity: 0.92;
}

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

.brand-name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.06rem;
  letter-spacing: 0.06em;
  line-height: 1.15;
  color: inherit;
}

.brand-sub {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.2em;
  line-height: 1.3;
  color: var(--c-mist);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* 头部元信息 */
.header-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
}

.header-note {
  display: none;
  font-family: var(--font-serif);
  font-size: 0.8rem;
  letter-spacing: 0.02em;
  color: var(--c-mist);
}

.copy-wrap {
  position: relative;
  display: inline-flex;
}

.version-badge {
  padding: 5px 10px;
  border: 1px solid rgba(232, 163, 61, 0.45);
  border-radius: var(--radius);
  background: rgba(232, 163, 61, 0.09);
  color: var(--c-amber);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  line-height: 1.4;
  cursor: pointer;
  transition: background 0.16s var(--ease), border-color 0.16s var(--ease), color 0.16s var(--ease);
}

.version-badge:hover,
.version-badge:focus-visible {
  background: rgba(232, 163, 61, 0.2);
  border-color: var(--c-amber);
  color: var(--c-amber-lit);
}

.copy-toast {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  z-index: 130;
  padding: 8px 12px;
  border: var(--line-teal);
  border-radius: var(--radius);
  background: var(--c-ink);
  color: var(--c-teal);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  line-height: 1.5;
  white-space: nowrap;
  opacity: 0;
  transform: translateY(-4px);
  pointer-events: none;
  transition: opacity 0.18s var(--ease), transform 0.18s var(--ease);
}

.copy-toast:not(:empty) {
  opacity: 1;
  transform: translateY(0);
}

/* 移动端栏目按钮 */
.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  padding: 9px 13px;
  border: 1px solid rgba(201, 212, 226, 0.3);
  border-radius: var(--radius);
  background: transparent;
  color: var(--c-paper);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  line-height: 1.4;
  cursor: pointer;
  transition: border-color 0.16s var(--ease), color 0.16s var(--ease);
}

.nav-toggle:hover,
.nav-toggle:focus-visible {
  border-color: var(--c-teal);
  color: var(--c-teal);
}

.nav-toggle-lines {
  position: relative;
  display: block;
  width: 16px;
  height: 10px;
}

.nav-toggle-lines::before,
.nav-toggle-lines::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 1px;
  background: currentColor;
  transition: transform 0.22s var(--ease);
}

.nav-toggle-lines::before { top: 0; }
.nav-toggle-lines::after { bottom: 0; }

.site-header[data-open] .nav-toggle-lines::before {
  transform: translateY(4.5px) rotate(45deg);
}

.site-header[data-open] .nav-toggle-lines::after {
  transform: translateY(-4.5px) rotate(-45deg);
}

/* 导航：移动端抽屉 */
.site-nav {
  position: fixed;
  inset-block: 0;
  inset-inline-start: 0;
  z-index: 80;
  width: min(320px, 84vw);
  padding: 92px 22px 32px;
  overflow-y: auto;
  background: linear-gradient(180deg, var(--c-night) 0%, var(--c-space) 74%, var(--c-ink) 100%);
  border-inline-end: 1px solid rgba(53, 208, 192, 0.32);
  box-shadow: 28px 0 70px rgba(6, 16, 31, 0.6);
  transform: translateX(-100%);
  visibility: hidden;
  transition: transform 0.28s var(--ease), visibility 0.28s var(--ease);
}

.site-header[data-open] .site-nav {
  transform: translateX(0);
  visibility: visible;
}

.nav-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.nav-link {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 13px 8px;
  border-bottom: 1px solid rgba(201, 212, 226, 0.12);
  border-radius: var(--radius);
  text-decoration: none;
  transition: background 0.16s var(--ease), border-color 0.16s var(--ease);
}

.nav-num {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.14em;
  line-height: 1.4;
  color: var(--c-mist);
  transition: color 0.16s var(--ease);
}

.nav-label {
  font-family: var(--font-body);
  font-size: 0.96rem;
  letter-spacing: 0.06em;
  line-height: 1.5;
  color: var(--c-tianshan);
  transition: color 0.16s var(--ease);
}

.nav-link:hover,
.nav-link:focus-visible {
  border-bottom-color: rgba(53, 208, 192, 0.5);
}

.nav-link:hover .nav-label,
.nav-link:focus-visible .nav-label {
  color: var(--c-elec);
}

.nav-link:hover .nav-num,
.nav-link:focus-visible .nav-num {
  color: var(--c-teal);
}

.nav-link[aria-current="page"] {
  background: linear-gradient(90deg, rgba(53, 208, 192, 0.14), rgba(53, 208, 192, 0) 82%);
  box-shadow: inset 2px 0 0 var(--c-teal);
}

.nav-link[aria-current="page"] .nav-label {
  color: var(--c-teal);
}

.nav-link[aria-current="page"] .nav-num {
  color: var(--c-amber);
}

/* 抽屉遮罩 */
.nav-scrim {
  position: fixed;
  inset: 0;
  z-index: 70;
  background: rgba(6, 16, 31, 0.62);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.24s var(--ease), visibility 0.24s var(--ease);
}

.site-header[data-open] .nav-scrim {
  opacity: 1;
  visibility: visible;
}

/* 会员中心悬浮入口 */
.account-fab {
  position: fixed;
  inset-inline-end: clamp(14px, 3vw, 30px);
  inset-block-end: clamp(14px, 3vw, 28px);
  z-index: 65;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 20px;
  border-radius: var(--radius);
  background: var(--c-amber);
  color: var(--c-ink);
  font-family: var(--font-body);
  font-size: 0.92rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.4;
  text-decoration: none;
  box-shadow: 0 16px 40px rgba(6, 16, 31, 0.6);
  transition: background 0.16s var(--ease), border-radius 0.24s var(--ease),
              padding 0.24s var(--ease), box-shadow 0.16s var(--ease);
}

.account-fab:hover,
.account-fab:focus-visible {
  background: var(--c-amber-lit);
  color: var(--c-ink);
  box-shadow: 0 18px 46px rgba(232, 163, 61, 0.34);
}

.account-fab::after {
  content: "";
  flex: 0 0 auto;
  width: 6px;
  height: 6px;
  border-inline-end: 1.5px solid currentColor;
  border-block-start: 1.5px solid currentColor;
  transform: rotate(45deg);
}

.account-fab__label {
  display: inline-block;
  max-width: 9em;
  overflow: hidden;
  white-space: nowrap;
  transition: max-width 0.26s var(--ease), opacity 0.18s var(--ease);
}

.account-fab__ver {
  font-family: var(--font-mono);
  font-size: 0.64rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  padding: 2px 6px;
  border: 1px solid rgba(6, 16, 31, 0.34);
  border-radius: var(--radius);
  color: rgba(6, 16, 31, 0.76);
  transition: opacity 0.18s var(--ease), max-width 0.26s var(--ease);
}

.account-fab.is-compact {
  padding: 0 17px;
  height: 54px;
  border-radius: 999px;
}

.account-fab.is-compact .account-fab__label,
.account-fab.is-compact .account-fab__ver {
  max-width: 0;
  opacity: 0;
  padding-inline: 0;
  border-width: 0;
}

.account-fab.is-compact:hover,
.account-fab.is-compact:focus-visible {
  padding: 13px 20px;
  height: auto;
  border-radius: var(--radius);
}

.account-fab.is-compact:hover .account-fab__label,
.account-fab.is-compact:focus-visible .account-fab__label {
  max-width: 9em;
  opacity: 1;
}

.account-fab.is-compact:hover .account-fab__ver,
.account-fab.is-compact:focus-visible .account-fab__ver {
  max-width: 8em;
  opacity: 1;
  padding: 2px 6px;
  border-width: 1px;
}

/* 主内容让出轨道 */
#main-content {
  display: block;
}

/* =========================================================
   页脚
   ========================================================= */
.site-footer {
  position: relative;
  margin-block-start: clamp(64px, 9vw, 118px);
  background: var(--c-ink);
  color: var(--c-tianshan);
  border-block-start: 1px solid rgba(201, 212, 226, 0.2);
  padding-block-start: clamp(38px, 5.5vw, 68px);
}

.site-footer::before {
  content: "";
  position: absolute;
  inset-inline: 0;
  top: 0;
  height: 1px;
  background: linear-gradient(90deg, rgba(53, 208, 192, 0.5), rgba(201, 212, 226, 0.1) 60%, rgba(232, 163, 61, 0.4));
}

.footer-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 50px);
  max-width: var(--shell);
  margin-inline: auto;
  padding: 0 var(--gutter) clamp(30px, 4.5vw, 54px);
}

.footer-col {
  min-width: 0;
}

.footer-brand {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.32rem;
  letter-spacing: 0.05em;
  line-height: 1.2;
  color: var(--c-paper);
}

.footer-tagline {
  margin-block-start: 12px;
  max-width: 34em;
  font-family: var(--font-serif);
  font-size: 0.9rem;
  line-height: 1.9;
  color: var(--c-mist);
}

.footer-copy {
  margin-block-start: 18px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: rgba(143, 163, 191, 0.8);
}

.footer-heading {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-teal);
  padding-block-end: 10px;
  margin-block-end: 14px;
  border-bottom: var(--line);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.footer-links a {
  display: inline-block;
  padding-block: 5px;
  color: var(--c-tianshan);
  font-size: 0.9rem;
  letter-spacing: 0.03em;
  border-bottom: 1px solid transparent;
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease);
}

.footer-links a:hover,
.footer-links a:focus-visible {
  color: var(--c-elec);
  border-bottom-color: rgba(53, 208, 192, 0.55);
}

.footer-contact {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-contact li {
  display: grid;
  grid-template-columns: 5.2em 1fr;
  gap: 12px;
  align-items: baseline;
  font-size: 0.86rem;
  line-height: 1.7;
}

.footer-key {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.12em;
  color: rgba(143, 163, 191, 0.85);
}

.footer-val {
  color: var(--c-tianshan);
  word-break: break-word;
}

.footer-footnote {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 26px;
  max-width: var(--shell);
  margin-inline: auto;
  padding: 16px var(--gutter) 26px;
  border-block-start: 1px solid rgba(201, 212, 226, 0.14);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  line-height: 2;
  color: rgba(143, 163, 191, 0.9);
}

.footer-footnote-item {
  white-space: nowrap;
}

/* =========================================================
   断点：平板
   ========================================================= */
@media (min-width: 760px) {
  .footer-inner {
    grid-template-columns: 1.5fr 1fr 1.35fr;
    align-items: start;
  }

  .header-note {
    display: inline;
  }
}

@media (min-width: 760px) and (max-width: 1179px) {
  .header-note {
    display: none;
  }
}

/* =========================================================
   断点：桌面 —— 画框式竖向轨道
   ========================================================= */
@media (min-width: 1024px) {
  .header-bar {
    padding-inline-start: calc(var(--rail) + var(--gutter));
    padding-block: 18px;
  }

  .brand {
    flex: 0 0 auto;
  }

  .header-meta {
    margin-inline-start: auto;
  }

  .nav-toggle {
    display: none;
  }

  .nav-scrim {
    display: none;
  }

  .site-nav {
    position: fixed;
    inset-block: 0;
    inset-inline-start: 0;
    width: var(--rail);
    padding: 0;
    overflow-y: auto;
    display: flex;
    align-items: center;
    justify-content: center;
    border-inline-end: 1px solid rgba(201, 212, 226, 0.16);
    background: linear-gradient(180deg, rgba(18, 41, 74, 0.85) 0%, rgba(11, 27, 51, 0.98) 58%, rgba(6, 16, 31, 0.99) 100%);
    box-shadow: none;
    transform: none;
    visibility: visible;
    z-index: 55;
  }

  .nav-list {
    flex-direction: column;
    align-items: center;
    gap: 2px;
  }

  .nav-item {
    width: 100%;
    display: flex;
    justify-content: center;
  }

  .nav-link {
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    gap: 9px;
    width: 58px;
    padding: 12px 0;
    border-bottom: 0;
    box-shadow: none;
  }

  .nav-link[aria-current="page"] {
    background: rgba(53, 208, 192, 0.1);
    box-shadow: inset 0 0 0 1px rgba(53, 208, 192, 0.34);
  }

  .nav-label {
    writing-mode: vertical-rl;
    font-size: 0.72rem;
    letter-spacing: 0.24em;
    line-height: 1;
  }

  .nav-num {
    font-size: 0.62rem;
  }

  #main-content {
    padding-inline-start: var(--rail);
  }

  .footer-inner {
    padding-inline-start: calc(var(--rail) + var(--gutter));
    padding-inline-end: var(--gutter);
  }

  .footer-footnote {
    padding-inline-start: calc(var(--rail) + var(--gutter));
    padding-inline-end: var(--gutter);
  }
}

@media (min-width: 1280px) {
  .header-note {
    display: inline;
  }
}

@media (min-width: 1024px) and (max-height: 760px) {
  .site-nav {
    justify-content: flex-start;
    padding-block: 76px 24px;
  }
}

/* 小屏：为底部悬浮入口留白 */
@media (max-width: 1023px) {
  .footer-footnote {
    padding-block-end: 92px;
  }
}

/* =========================================================
   可访问性：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;
  }

  .site-nav,
  .nav-scrim,
  .account-fab {
    transition: none !important;
  }
}