/* =========================================================
   site.css — 顺发游艺 共享外壳
   1. reset  2. 变量  3. 中文排版  4. 通用组件
   5. 头部  6. 页脚  7. 动效  8. 响应式
   ========================================================= */

/* ---------- 1. reset ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

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

body,
h1, h2, h3, h4, h5, p, figure, blockquote, dl, dd, ul, ol {
  margin: 0;
}

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

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
}

a {
  color: inherit;
}

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

/* ---------- 2. 变量 ---------- */
:root {
  --ink: #0C1726;
  --ink-deep: #08111C;
  --navy-700: #16283F;
  --navy-750: #122134;
  --gold: #D8A93B;
  --gold-soft: #E7C87A;
  --cinnabar: #C6402F;
  --celadon: #59A08B;
  --rice: #F3EDE1;
  --stone: #8B929B;
  --clay: #C4794F;

  --line: rgba(243, 237, 225, 0.10);
  --line-strong: rgba(243, 237, 225, 0.20);
  --wash-gold: rgba(216, 169, 59, 0.12);

  --font-display: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "SimSun", Georgia, serif;
  --font-mono: "IBM Plex Mono", "Roboto Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --fs-1: 0.8125rem;
  --fs-2: 0.9375rem;
  --fs-3: 1.0625rem;
  --fs-4: 1.25rem;
  --fs-5: 1.5rem;
  --fs-6: 2rem;
  --fs-7: 2.75rem;
  --fs-8: 4rem;
  --fs-9: 6.4rem;

  --r-sm: 12px;
  --r-md: 18px;
  --r-lg: 26px;
  --r-xl: 36px;
  --r-pill: 999px;

  --gap: 18px;
  --rail: 84px;
  --rail-open: 220px;

  --shadow-lift: 0 16px 30px -18px rgba(0, 0, 0, 0.9);
}

/* ---------- 3. 中文排版 ---------- */
body {
  min-height: 100vh;
  background: var(--ink);
  color: var(--rice);
  font-family: var(--font-body);
  font-size: var(--fs-3);
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: 0.01em;
  word-break: break-word;
  text-wrap: pretty;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -0.01em;
}

p, li, dd {
  line-height: 1.75;
}

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

:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- 4. 通用组件 ---------- */
.container {
  width: min(100% - 32px, 1360px);
  margin-inline: auto;
}

.section {
  padding-block: clamp(36px, 5vw, 64px);
}

.display {
  display: inline-block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.6rem, 7vw, 6.4rem);
  line-height: 1.02;
  letter-spacing: -0.02em;
  transform: skewX(-4deg);
  transform-origin: left bottom;
}

.lede {
  max-width: 34em;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(1.1rem, 1.6vw, 1.4rem);
  line-height: 1.9;
  color: rgba(243, 237, 225, 0.88);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--gold-soft);
}

.file-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gold);
}

.file-tag::before {
  content: "";
  display: block;
  width: 16px;
  height: 1px;
  background: currentColor;
}

.mono {
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
}

.prose {
  max-width: 34em;
}

.prose p {
  margin-bottom: 1em;
}

.prose p:last-child {
  margin-bottom: 0;
}

.prose h2,
.prose h3 {
  margin: 1.4em 0 0.5em;
  font-size: var(--fs-5);
}

.prose strong {
  color: var(--gold-soft);
}

.rule {
  height: 1px;
  margin: 0;
  border: 0;
  background: var(--line);
}

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

.grid--2,
.grid--3 {
  grid-template-columns: 1fr;
}

@media (min-width: 720px) {
  .grid--2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .grid--3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5em;
  padding: 0.72em 1.3em;
  border: 1px solid var(--gold);
  border-radius: var(--r-pill);
  background: transparent;
  color: var(--gold);
  font-size: var(--fs-2);
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.3;
  text-decoration: none;
  transition: background 180ms ease-out, color 180ms ease-out, border-color 180ms ease-out;
}

.btn:hover {
  background: var(--gold);
  color: var(--ink);
}

.btn--gold {
  background: var(--gold);
  border-color: var(--gold);
  color: var(--ink);
}

.btn--gold:hover {
  background: var(--gold-soft);
  border-color: var(--gold-soft);
}

.btn--ghost {
  border-color: var(--line-strong);
  color: var(--rice);
}

.btn--ghost:hover {
  background: rgba(89, 160, 139, 0.16);
  border-color: var(--celadon);
  color: var(--rice);
}

.btn--sm {
  padding: 0.55em 0.95em;
  font-size: var(--fs-1);
}

/* 卡片 */
.card {
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--navy-700);
  transition: transform 180ms ease-out, box-shadow 180ms ease-out, border-color 180ms ease-out;
}

.card:hover {
  transform: translateY(-2px);
  border-color: rgba(216, 169, 59, 0.4);
  box-shadow: var(--shadow-lift);
}

/* 状态胶囊 */
.stamp {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  padding: 0.24em 0.72em;
  border: 1px solid transparent;
  border-radius: var(--r-pill);
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  letter-spacing: 0.06em;
  line-height: 1.5;
  white-space: nowrap;
}

.stamp::before {
  content: "";
  display: block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
}

.stamp--green {
  background: var(--celadon);
  border-color: var(--celadon);
  color: var(--ink);
}

.stamp--red {
  background: var(--cinnabar);
  border-color: var(--cinnabar);
  color: var(--rice);
}

.stamp--gray {
  background: rgba(139, 146, 155, 0.16);
  border-color: rgba(139, 146, 155, 0.4);
  color: var(--stone);
}

/* 图片容器 */
.media {
  position: relative;
  overflow: hidden;
  aspect-ratio: 4 / 3;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--navy-700);
}

.media__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.94) contrast(1.02);
}

.media::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background: rgba(12, 23, 38, 0.06);
  pointer-events: none;
}

.media::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 2;
  background-image: radial-gradient(rgba(243, 237, 225, 0.10) 0.6px, transparent 0.7px);
  background-size: 3px 3px;
  opacity: 0.25;
  pointer-events: none;
}

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

.media--tall {
  aspect-ratio: 3 / 4;
}

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

.media__cap {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  letter-spacing: 0.06em;
  color: var(--stone);
}

/* 面包屑 */
.crumbs {
  padding-block: 14px;
}

.crumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  letter-spacing: 0.08em;
  color: var(--stone);
}

.crumbs__list li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.crumbs__list li + li::before {
  content: "/";
  color: rgba(139, 146, 155, 0.6);
}

.crumbs__link {
  color: var(--gold-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.crumbs__link:hover {
  border-bottom-color: currentColor;
}

.crumbs__current {
  color: var(--rice);
}

/* ---------- 5. 头部 ---------- */
.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 130;
  padding: 0.7em 1.15em;
  border-radius: var(--r-pill);
  background: var(--gold);
  color: var(--ink);
  font-size: var(--fs-2);
  font-weight: 700;
  text-decoration: none;
  transform: translateY(-180%);
  transition: transform 160ms ease-out;
}

.skip-link:focus,
.skip-link:focus-visible {
  transform: translateY(0);
  outline-offset: 2px;
}

.site-header {
  position: relative;
  z-index: 90;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
  color: var(--rice);
  text-decoration: none;
}

.brand__mark {
  display: grid;
  place-items: center;
  flex: none;
  width: 40px;
  height: 40px;
  border: 1px solid rgba(216, 169, 59, 0.55);
  border-radius: var(--r-sm);
  background: linear-gradient(160deg, rgba(216, 169, 59, 0.22), rgba(216, 169, 59, 0.04));
  color: var(--gold);
  font-size: var(--fs-4);
  font-weight: 900;
  transition: border-color 180ms ease-out, background 180ms ease-out;
}

.brand:hover .brand__mark {
  border-color: var(--gold);
  background: linear-gradient(160deg, rgba(216, 169, 59, 0.4), rgba(216, 169, 59, 0.08));
}

.brand__text {
  display: flex;
  flex-direction: column;
  min-width: 0;
  line-height: 1.2;
  opacity: 1;
  transition: opacity 160ms ease-out;
}

.brand__name {
  font-size: var(--fs-2);
  font-weight: 900;
  white-space: nowrap;
}

.brand__sub {
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  letter-spacing: 0.16em;
  color: var(--stone);
  white-space: nowrap;
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-pill);
  background: rgba(22, 40, 63, 0.7);
  color: var(--rice);
  font-size: var(--fs-2);
  font-weight: 700;
  line-height: 1;
  transition: border-color 160ms ease-out, color 160ms ease-out;
}

.nav-toggle:hover {
  border-color: var(--gold);
  color: var(--gold);
}

.nav-toggle[aria-expanded="true"] {
  border-color: var(--gold);
  color: var(--gold);
}

.nav-toggle__bars {
  display: grid;
  gap: 4px;
  width: 16px;
}

.nav-toggle__bars span {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
}

.nav-toggle__text {
  letter-spacing: 0.08em;
}

.site-nav {
  display: flex;
  flex-direction: column;
}

.file-tag {
  color: var(--gold);
}

.nav-close {
  display: inline-flex;
  align-items: center;
  padding: 7px 14px;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-pill);
  color: var(--rice);
  font-size: var(--fs-1);
  letter-spacing: 0.08em;
  transition: border-color 160ms ease-out, color 160ms ease-out;
}

.nav-close:hover {
  border-color: var(--gold);
  color: var(--gold);
}

.site-nav__hint {
  font-family: var(--font-serif);
  font-size: var(--fs-2);
  color: var(--stone);
}

.nav-quick {
  display: grid;
  gap: 10px;
}

.quick-card {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 14px 16px;
  border: 1px solid rgba(216, 169, 59, 0.28);
  border-radius: var(--r-md);
  background: linear-gradient(120deg, rgba(216, 169, 59, 0.14), rgba(22, 40, 63, 0.9));
  color: var(--rice);
  text-decoration: none;
  transition: border-color 180ms ease-out, background 180ms ease-out;
}

.quick-card:hover {
  border-color: var(--gold);
  background: linear-gradient(120deg, rgba(216, 169, 59, 0.24), rgba(22, 40, 63, 1));
}

.quick-card__num {
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  letter-spacing: 0.14em;
  color: var(--gold);
}

.quick-card__label {
  font-size: var(--fs-3);
  font-weight: 900;
}

.quick-card__note {
  font-size: var(--fs-1);
  color: var(--stone);
}

.nav-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-top: 4px;
}

.nav-list__link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 8px;
  border-bottom: 1px solid var(--line);
  border-radius: 8px;
  color: var(--rice);
  text-decoration: none;
  transition: color 160ms ease-out, background 160ms ease-out;
}

.nav-list__link:hover {
  background: rgba(216, 169, 59, 0.08);
  color: var(--gold-soft);
}

.nav-list__link:hover .nav-list__num {
  color: var(--gold);
}

.nav-list__num {
  min-width: 2.2em;
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  letter-spacing: 0.1em;
  color: var(--stone);
  transition: color 160ms ease-out;
}

.nav-list__label {
  font-size: var(--fs-4);
  font-weight: 700;
  transition: color 160ms ease-out;
}

.nav-list__link[aria-current="page"] {
  background: rgba(216, 169, 59, 0.14);
  color: var(--gold);
}

.nav-list__link[aria-current="page"] .nav-list__num {
  color: var(--gold);
}

.nav-list__link[aria-current="page"] .nav-list__label::after {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  margin-left: 10px;
  border-radius: 50%;
  background: var(--gold);
  vertical-align: middle;
}

.site-nav__foot {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 8px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.site-nav__meta {
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  line-height: 1.7;
  letter-spacing: 0.04em;
  color: var(--stone);
}

/* ---------- 6. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: 64px;
  padding-top: 36px;
  border-top: 1px solid rgba(216, 169, 59, 0.22);
  background: linear-gradient(180deg, #0A1421 0%, var(--ink) 38%, #101E31 100%);
  color: var(--rice);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: min(52%, 360px);
  height: 3px;
  background: linear-gradient(90deg, var(--gold), var(--clay) 70%, rgba(196, 121, 79, 0));
}

.footer-top {
  display: grid;
  gap: 28px;
  padding-bottom: 30px;
}

@media (min-width: 860px) {
  .footer-top {
    grid-template-columns: minmax(200px, 0.85fr) 2fr;
    gap: 48px;
    align-items: start;
  }
}

.footer-brand {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 6px 12px;
}

.footer-brand__mark {
  grid-row: span 2;
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border: 1px solid rgba(216, 169, 59, 0.5);
  border-radius: var(--r-sm);
  background: var(--wash-gold);
  color: var(--gold);
  font-size: var(--fs-4);
  font-weight: 900;
}

.footer-brand__name {
  font-size: var(--fs-4);
  font-weight: 900;
  line-height: 1.3;
}

.footer-brand__note {
  grid-column: 1 / -1;
  max-width: 26em;
  font-size: var(--fs-2);
  line-height: 1.7;
  color: var(--stone);
}

.footer-cols {
  display: grid;
  gap: 22px;
}

@media (min-width: 520px) {
  .footer-cols {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }
}

.footer-col__title {
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gold);
}

.footer-links {
  display: grid;
  gap: 6px;
}

.footer-link {
  display: inline-block;
  padding: 3px 0;
  border-bottom: 1px solid transparent;
  color: rgba(243, 237, 225, 0.84);
  font-size: var(--fs-2);
  text-decoration: none;
  transition: color 160ms ease-out, border-color 160ms ease-out;
}

.footer-link:hover {
  color: var(--gold-soft);
  border-bottom-color: rgba(216, 169, 59, 0.6);
}

.footer-band {
  display: grid;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

@media (min-width: 760px) {
  .footer-band {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.footer-band__item {
  display: grid;
  gap: 4px;
  padding: 16px 0;
}

@media (min-width: 760px) {
  .footer-band__item {
    padding: 18px 22px;
  }

  .footer-band__item:first-child {
    padding-left: 0;
  }

  .footer-band__item + .footer-band__item {
    border-left: 1px solid var(--line);
  }
}

.footer-band__k {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--stone);
}

.footer-band__v {
  font-family: var(--font-mono);
  font-size: var(--fs-2);
  letter-spacing: 0.02em;
  word-break: break-word;
  color: var(--rice);
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 18px;
  padding: 18px 0 26px;
}

.footer-note {
  flex: 1 1 100%;
  max-width: 52em;
  font-size: var(--fs-1);
  line-height: 1.7;
  color: var(--stone);
}

.footer-legal__icp,
.footer-legal__copy {
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  letter-spacing: 0.06em;
  color: var(--stone);
}

@media (min-width: 760px) {
  .footer-note {
    flex: 1 1 auto;
  }

  .footer-legal__icp {
    margin-left: auto;
  }
}

/* ---------- 7. 动效与状态 ---------- */
body[data-nav-open] {
  overflow: hidden;
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 100;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--gold), var(--clay));
  transform: scaleX(var(--p, 0));
  transform-origin: left center;
  pointer-events: none;
}

.js-reveal [data-reveal] {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 240ms ease-out, transform 240ms ease-out;
}

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

/* ---------- 8. 响应式 ---------- */
/* 移动端：顶部条 + 全屏抽屉 */
@media (max-width: 899px) {
  .site-header {
    position: sticky;
    top: 0;
    z-index: 90;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 9px 14px;
    border-bottom: 1px solid var(--line);
    background: rgba(12, 23, 38, 0.97);
  }

  .brand {
    flex: 1 1 auto;
    gap: 10px;
    padding: 0;
  }

  .site-nav {
    position: fixed;
    inset: 0;
    z-index: 120;
    gap: 16px;
    padding: 18px 18px 32px;
    overflow-x: hidden;
    overflow-y: auto;
    background: linear-gradient(180deg, var(--ink-deep) 0%, var(--ink) 32%, #0A1523 100%);
    transform: translateX(-100%);
    visibility: hidden;
    transition: transform 220ms cubic-bezier(0.22, 0.61, 0.36, 1), visibility 220ms;
  }

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

  .site-nav__head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--line);
  }

  .site-nav__foot {
    margin-top: auto;
    gap: 10px;
  }

  .site-nav__foot .btn {
    justify-content: center;
  }

  .nav-quick {
    gap: 10px;
  }

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

/* 桌面端：左侧竖向轨道 */
@media (min-width: 900px) {
  body {
    padding-left: var(--rail);
  }

  .nav-toggle {
    display: none;
  }

  .site-header {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 90;
    display: flex;
    flex-direction: column;
    width: var(--rail);
    padding: 14px 0;
    overflow: hidden;
    border-right: 1px solid var(--line);
    background: linear-gradient(180deg, #101E31 0%, var(--ink) 45%, #091320 100%);
    transition: width 200ms cubic-bezier(0.22, 0.61, 0.36, 1), box-shadow 200ms ease-out;
  }

  .site-header::before {
    content: "";
    position: absolute;
    inset: 0 0 auto 0;
    height: 3px;
    background: linear-gradient(90deg, var(--gold), var(--cinnabar) 60%, rgba(198, 64, 47, 0));
  }

  .site-header:hover,
  .site-header:focus-within {
    width: var(--rail-open);
    box-shadow: 26px 0 60px -30px rgba(0, 0, 0, 0.85);
  }

  .brand {
    flex: none;
    gap: 12px;
    padding: 6px 22px;
  }

  .brand__text {
    opacity: 0;
    transition: opacity 160ms ease-out;
  }

  .site-header:hover .brand__text,
  .site-header:focus-within .brand__text {
    opacity: 1;
  }

  .site-nav {
    flex: 1;
    min-height: 0;
    gap: 8px;
    padding: 12px 10px 0;
    overflow-x: hidden;
    overflow-y: auto;
    scrollbar-width: none;
  }

  .site-nav::-webkit-scrollbar {
    display: none;
  }

  .site-nav__head,
  .site-nav__hint,
  .nav-quick {
    display: none;
  }

  .nav-list {
    flex: none;
    gap: 2px;
    margin: 0;
  }

  .nav-list__link {
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    gap: 6px;
    padding: 9px 2px;
    border-bottom: 0;
    border-radius: var(--r-sm);
    text-align: center;
    transition: background 160ms ease-out, color 160ms ease-out;
  }

  .nav-list__num {
    min-width: 0;
    font-size: 0.6875rem;
  }

  .nav-list__label {
    writing-mode: vertical-rl;
    text-orientation: upright;
    font-size: var(--fs-1);
    font-weight: 700;
    letter-spacing: 0.2em;
    line-height: 1.2;
  }

  .nav-list__link[aria-current="page"] .nav-list__label::after {
    display: none;
  }

  .site-header:hover .nav-list__link,
  .site-header:focus-within .nav-list__link {
    flex-direction: row;
    align-items: center;
    justify-content: flex-start;
    gap: 12px;
    padding: 11px 14px;
    text-align: left;
  }

  .site-header:hover .nav-list__label,
  .site-header:focus-within .nav-list__label {
    writing-mode: horizontal-tb;
    font-size: var(--fs-2);
    letter-spacing: 0.02em;
  }

  .site-nav__foot {
    gap: 8px;
    margin-top: auto;
    padding: 14px 10px 0;
    border-top: 1px solid var(--line);
    opacity: 0;
    transition: opacity 160ms ease-out;
  }

  .site-header:hover .site-nav__foot,
  .site-header:focus-within .site-nav__foot {
    opacity: 1;
  }

  .site-nav__foot .btn {
    padding: 0.55em 0.9em;
    font-size: var(--fs-1);
    white-space: nowrap;
  }

  .site-nav__meta {
    padding-inline: 2px;
  }

  .scroll-progress {
    width: 3px;
    height: 100%;
    background: linear-gradient(180deg, var(--gold), var(--cinnabar));
    transform: scaleY(var(--p, 0));
    transform-origin: top center;
  }

  /* 折叠态：Esc 收起轨道 */
  .site-header[data-collapsed],
  .site-header[data-collapsed]:hover,
  .site-header[data-collapsed]:focus-within {
    width: var(--rail);
    box-shadow: none;
  }

  .site-header[data-collapsed] .brand__text,
  .site-header[data-collapsed] .site-nav__foot {
    opacity: 0;
  }

  .site-header[data-collapsed] .nav-list__link {
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    gap: 6px;
    padding: 9px 2px;
    text-align: center;
  }

  .site-header[data-collapsed] .nav-list__label {
    writing-mode: vertical-rl;
    font-size: var(--fs-1);
    letter-spacing: 0.2em;
  }
}

@media (min-width: 900px) {
  .container {
    width: min(100% - 48px, 1360px);
  }
}

/* 降低动效偏好 */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }

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

  .card:hover {
    transform: none;
  }

  .skip-link {
    transition: none;
  }
}