/* =========================================================
   365官方网 · 共享外壳样式 /assets/site.css
   深海调度蓝 · 奶油档案纸 · 工业橙加急信号
   ========================================================= */

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

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

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

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

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

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

button { cursor: pointer; background: none; border: 0; }

a { color: inherit; }

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

/* ---------- 2. 变量 ---------- */
:root {
  --c-navy: #0B1B2B;
  --c-navy-2: #12293F;
  --c-cream: #F5EEDF;
  --c-warm: #FBF7EF;
  --c-orange: #E86A1A;
  --c-orange-soft: #F2A46B;
  --c-ink: #231A12;
  --c-mist: #6B7A8F;
  --c-sea: #2E7D7B;
  --c-amber: #C98A1B;
  --c-pine: #3D8B6A;
  --c-brick: #B34A3A;

  --line-night: rgba(245, 238, 223, .14);
  --line-night-strong: rgba(245, 238, 223, .28);
  --line-paper: rgba(35, 26, 18, .13);
  --text-night: rgba(251, 247, 239, .82);
  --text-night-soft: rgba(251, 247, 239, .58);
  --text-paper: rgba(35, 26, 18, .74);

  --r-xl: 28px;
  --r-lg: 20px;
  --r-md: 14px;
  --r-pill: 999px;

  --wrap: 1240px;
  --gutter: clamp(1.15rem, 4vw, 3.25rem);

  --t: 180ms;
  --t-slow: 220ms;
  --ease: cubic-bezier(.4, 0, .2, 1);
  --shadow-lift: 0 22px 48px -30px rgba(11, 27, 43, .7);

  --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "SimSun", serif;
  --font-sans: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", ui-monospace, Consolas, "Liberation Mono", monospace;
}

/* ---------- 3. 文档基础与中文排版 ---------- */
body {
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--c-warm);
  background-color: var(--c-navy);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 700;
  line-height: 1.28;
  letter-spacing: .012em;
}

h1 { font-size: clamp(2.1rem, 4.4vw, 3.4rem); }
h2 { font-size: clamp(1.55rem, 2.8vw, 2.1rem); }
h3 { font-size: clamp(1.15rem, 1.8vw, 1.4rem); }
h4 { font-size: 1.05rem; }

p { text-wrap: pretty; }
h1, h2, h3 { text-wrap: balance; }

::selection {
  background: var(--c-orange);
  color: #FFF6EE;
}

:where(a, button, [tabindex]):focus-visible {
  outline: 2px solid var(--c-orange-soft);
  outline-offset: 3px;
  border-radius: 6px;
}

main { display: block; }

#main-content { scroll-margin-top: 6rem; }

/* ---------- 4. 布局容器 ---------- */
.wrap {
  width: min(var(--wrap), calc(100% - var(--gutter) * 2));
  margin-inline: auto;
}

.wrap--narrow {
  width: min(820px, calc(100% - var(--gutter) * 2));
  margin-inline: auto;
}

.section { padding-block: clamp(3rem, 7.5vw, 6.5rem); }
.section--tight { padding-block: clamp(2rem, 4.5vw, 3.5rem); }

.section--night { background: var(--c-navy); color: var(--c-warm); }
.section--night-2 { background: var(--c-navy-2); color: var(--c-warm); }
.section--paper { background: var(--c-cream); color: var(--c-ink); }
.section--warm { background: var(--c-warm); color: var(--c-ink); }

.section--paper .lede,
.section--warm .lede { color: var(--text-paper); }
.section--paper .eyebrow,
.section--warm .eyebrow { color: var(--c-orange); }
.section--paper .meta,
.section--warm .meta { color: rgba(35, 26, 18, .55); }

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

.section--paper .rule,
.section--warm .rule { background: var(--line-paper); }

.head-row {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem 2rem;
  margin-bottom: clamp(1.5rem, 3vw, 2.5rem);
}

/* Bento 网格 */
.bento {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(.9rem, 1.8vw, 1.5rem);
}

.bento > * { min-width: 0; }

.span-2 { grid-column: span 2; }
.span-3 { grid-column: span 3; }
.span-4 { grid-column: span 4; }
.span-5 { grid-column: span 5; }
.span-6 { grid-column: span 6; }
.span-7 { grid-column: span 7; }
.span-8 { grid-column: span 8; }
.span-9 { grid-column: span 9; }
.span-10 { grid-column: span 10; }
.span-12 { grid-column: span 12; }

/* 常规网格 */
.grid { display: grid; gap: clamp(1rem, 2vw, 1.75rem); }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-split { grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr); }

/* ---------- 5. 文本元件 ---------- */
.eyebrow {
  display: inline-block;
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: .22em;
  color: var(--c-orange-soft);
}

.lede {
  max-width: 62ch;
  font-size: clamp(1.02rem, 1.5vw, 1.16rem);
  line-height: 1.85;
  color: var(--text-night);
}

.meta {
  font-size: .82rem;
  line-height: 1.7;
  color: var(--c-mist);
}

.num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  letter-spacing: -.005em;
}

.aside-note {
  padding-left: 1rem;
  border-left: 3px solid var(--c-orange-soft);
  font-size: .88rem;
  line-height: 1.8;
  color: var(--c-mist);
}

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

/* ---------- 6. 按钮与胶囊 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .45rem;
  padding: .58rem 1.05rem;
  border-radius: var(--r-pill);
  border: 1px solid transparent;
  font-size: .88rem;
  font-weight: 600;
  line-height: 1.3;
  text-decoration: none;
  white-space: nowrap;
  transition:
    background-color var(--t) var(--ease),
    border-color var(--t) var(--ease),
    color var(--t) var(--ease);
}

.btn-accent {
  background: var(--c-orange);
  color: #FFF6EE;
  border-color: var(--c-orange);
}

.btn-accent:hover {
  background: var(--c-orange-soft);
  border-color: var(--c-orange-soft);
  color: var(--c-ink);
}

.btn-ghost {
  background: rgba(11, 27, 43, .32);
  border-color: var(--line-night-strong);
  color: var(--c-warm);
}

.btn-ghost:hover {
  background: rgba(232, 106, 26, .16);
  border-color: var(--c-orange-soft);
  color: var(--c-warm);
}

.btn-soft {
  background: var(--c-cream);
  border-color: var(--line-paper);
  color: var(--c-ink);
}

.btn-soft:hover {
  background: #fff;
  border-color: var(--c-orange);
}

.pill-row {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  padding: .36rem .85rem;
  border-radius: var(--r-pill);
  border: 1px solid var(--line-paper);
  background: rgba(255, 255, 255, .55);
  font-size: .8rem;
  line-height: 1.5;
  color: var(--c-ink);
  text-decoration: none;
  transition:
    border-color var(--t) var(--ease),
    background-color var(--t) var(--ease),
    color var(--t) var(--ease);
}

.pill:hover {
  border-color: var(--c-orange);
  color: #B9530F;
}

.pill--accent {
  border-color: var(--c-orange);
  background: rgba(232, 106, 26, .12);
  color: #B9530F;
}

.pill--night {
  border-color: var(--line-night-strong);
  background: rgba(245, 238, 223, .06);
  color: var(--text-night);
}

.pill--night:hover {
  border-color: var(--c-orange-soft);
  color: var(--c-warm);
}

/* ---------- 7. 卡片与信息块 ---------- */
.card {
  position: relative;
  padding: clamp(1.25rem, 2.6vw, 2.1rem);
  border-radius: var(--r-xl);
  border: 1px solid transparent;
  transition:
    border-color var(--t-slow) var(--ease),
    background-color var(--t-slow) var(--ease),
    box-shadow var(--t-slow) var(--ease);
}

.card--paper {
  background: var(--c-cream);
  border-color: var(--line-paper);
  color: var(--c-ink);
}

.card--warm {
  background: var(--c-warm);
  border-color: var(--line-paper);
  color: var(--c-ink);
}

.card--night {
  background: var(--c-navy-2);
  border-color: var(--line-night);
  color: var(--c-warm);
}

.card--interactive:hover {
  border-color: var(--c-orange);
  box-shadow: var(--shadow-lift);
}

.card-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: .4rem 1rem;
  margin-bottom: .85rem;
}

.card-title {
  font-family: var(--font-serif);
  font-size: 1.18rem;
  font-weight: 700;
  line-height: 1.4;
}

.card-meta {
  font-size: .78rem;
  color: var(--c-mist);
}

.card--night .card-meta { color: var(--text-night-soft); }
.card--night .meta { color: var(--text-night-soft); }

/* ---------- 8. 状态点与时间轴 ---------- */
.status {
  display: inline-flex;
  align-items: center;
  gap: .42rem;
  font-size: .78rem;
  font-weight: 600;
  color: var(--c-mist);
}

.dot {
  width: .55rem;
  height: .55rem;
  border-radius: 50%;
  background: currentColor;
  flex: none;
}

.status[data-state="done"] { color: var(--c-sea); }
.status[data-state="progress"] { color: var(--c-amber); }
.status[data-state="closed"] { color: var(--c-pine); }
.status[data-state="alert"] { color: var(--c-brick); }

.timeline {
  display: grid;
  gap: 1.4rem;
  padding-left: 1.5rem;
  border-left: 1px solid var(--line-night-strong);
}

.timeline-item {
  position: relative;
  min-width: 0;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: calc(-1.5rem - 5.5px);
  top: .55rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--c-navy-2);
  border: 2px solid var(--c-orange-soft);
  transition:
    background-color var(--t) var(--ease),
    border-color var(--t) var(--ease);
}

.timeline-item:hover::before {
  background: var(--c-orange);
  border-color: var(--c-orange);
}

.timeline--paper { border-left-color: var(--line-paper); }
.timeline--paper .timeline-item::before { background: var(--c-cream); }

/* ---------- 9. 媒体容器 ---------- */
.media {
  position: relative;
  overflow: hidden;
  border-radius: var(--r-xl);
  border: 1px solid var(--line-night);
  background: linear-gradient(140deg, #16324c 0%, #0B1B2B 100%);
}

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

.media[data-ratio="21x9"] { aspect-ratio: 21 / 9; }
.media[data-ratio="16x9"] { aspect-ratio: 16 / 9; }
.media[data-ratio="4x3"] { aspect-ratio: 4 / 3; }
.media[data-ratio="1x1"] { aspect-ratio: 1 / 1; }
.media[data-ratio="3x4"] { aspect-ratio: 3 / 4; }

.media--paper {
  border-color: var(--line-paper);
  background: linear-gradient(140deg, #EFE5D1 0%, #F5EEDF 100%);
}

.media-caption {
  margin-top: .65rem;
  font-size: .8rem;
  line-height: 1.7;
  color: var(--c-mist);
}

/* ---------- 10. 链接、面包屑与长文 ---------- */
.link-more {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  font-size: .9rem;
  font-weight: 600;
  color: var(--c-orange);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition:
    border-color var(--t) var(--ease),
    color var(--t) var(--ease);
}

.link-more::after { content: "→"; display: inline-block; }
.link-more:hover { border-bottom-color: currentColor; }

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .45rem;
  font-size: .82rem;
  color: var(--c-mist);
}

.breadcrumbs li { display: inline-flex; align-items: center; gap: .45rem; }
.breadcrumbs li + li::before { content: "/"; color: currentColor; opacity: .55; }

.breadcrumb-link {
  color: var(--c-mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition:
    color var(--t) var(--ease),
    border-color var(--t) var(--ease);
}

.breadcrumb-link:hover {
  color: var(--c-orange);
  border-bottom-color: currentColor;
}

.breadcrumbs [aria-current="page"] { color: var(--c-ink); font-weight: 600; }
.breadcrumbs--night [aria-current="page"] { color: var(--c-warm); }
.breadcrumbs--night .breadcrumb-link { color: var(--text-night-soft); }

.prose {
  font-size: 1.02rem;
  line-height: 1.9;
  max-width: 72ch;
}

.prose > * + * { margin-top: 1.15em; }
.prose h2 { margin-top: 2.2em; }
.prose h3 { margin-top: 1.8em; }

.prose ul,
.prose ol {
  padding-left: 1.35em;
  list-style: disc;
}

.prose ol { list-style: decimal; }
.prose li + li { margin-top: .35em; }

.prose a {
  color: var(--c-orange);
  text-decoration: underline;
  text-underline-offset: .22em;
  text-decoration-thickness: 1px;
}

.prose a:hover { color: var(--c-orange-soft); }

.prose blockquote {
  padding-left: 1.1rem;
  border-left: 3px solid var(--c-orange-soft);
  opacity: .9;
}

.prose code {
  padding: .12em .42em;
  border-radius: 6px;
  background: rgba(107, 122, 143, .16);
  font-family: var(--font-mono);
  font-size: .92em;
}

/* ---------- 11. 头部 ---------- */
.skip-link {
  position: absolute;
  left: 1rem;
  top: -4rem;
  z-index: 200;
  padding: .65rem 1.1rem;
  border-radius: var(--r-pill);
  background: var(--c-orange);
  color: #FFF6EE;
  font-size: .88rem;
  font-weight: 600;
  text-decoration: none;
  transition: top var(--t) var(--ease);
}

.skip-link:focus,
.skip-link:focus-visible { top: .85rem; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background: linear-gradient(180deg, rgba(11, 27, 43, .62) 0%, rgba(11, 27, 43, 0) 100%);
  border-bottom: 1px solid var(--line-night);
  color: var(--c-warm);
  transition:
    background-color var(--t-slow) var(--ease),
    border-color var(--t-slow) var(--ease),
    box-shadow var(--t-slow) var(--ease);
}

.site-header.is-scrolled {
  background: rgba(18, 41, 63, .97);
  border-bottom-color: var(--line-night-strong);
  box-shadow: 0 14px 34px -26px rgba(0, 0, 0, .85);
}

.header-shell {
  position: relative;
  display: flex;
  align-items: center;
  gap: clamp(.9rem, 2vw, 1.9rem);
  width: min(var(--wrap), calc(100% - var(--gutter) * 2));
  margin-inline: auto;
  min-height: 76px;
}

.brand {
  display: flex;
  flex-direction: column;
  gap: .1rem;
  line-height: 1.2;
}

.brand-mark {
  font-family: var(--font-serif);
  font-size: 1.24rem;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--c-warm);
  text-decoration: none;
  transition: color var(--t) var(--ease);
}

.brand-mark:hover { color: var(--c-orange-soft); }

.brand-line {
  font-size: .7rem;
  letter-spacing: .16em;
  color: var(--c-orange-soft);
}

.primary-nav { margin-inline-start: auto; }

.nav-list {
  display: flex;
  align-items: center;
  gap: clamp(.35rem, 1.1vw, 1.25rem);
  overflow-x: auto;
  scrollbar-width: none;
}

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

.nav-link {
  position: relative;
  display: inline-block;
  padding: .5rem .15rem;
  font-size: .94rem;
  white-space: nowrap;
  color: var(--text-night);
  text-decoration: none;
  transition: color var(--t) var(--ease);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: .18rem;
  height: 2px;
  border-radius: 2px;
  background: var(--c-orange);
  transition: right var(--t) var(--ease);
}

.nav-link:hover { color: var(--c-warm); }
.nav-link:hover::after { right: 0; }

.nav-link[aria-current="page"] {
  color: var(--c-warm);
  font-weight: 600;
}

.nav-link[aria-current="page"]::after { right: 0; }

.header-rail {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: .45rem;
}

.utility-links {
  display: flex;
  gap: 1.1rem;
  font-size: .76rem;
}

.utility-link {
  color: var(--text-night-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition:
    color var(--t) var(--ease),
    border-color var(--t) var(--ease);
}

.utility-link:hover {
  color: var(--c-orange-soft);
  border-bottom-color: currentColor;
}

.header-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .45rem;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: .5rem;
  margin-inline-start: auto;
  padding: .5rem .9rem;
  border-radius: var(--r-pill);
  border: 1px solid var(--line-night-strong);
  background: rgba(11, 27, 43, .45);
  color: var(--c-warm);
  font-size: .85rem;
  transition:
    border-color var(--t) var(--ease),
    background-color var(--t) var(--ease);
}

.nav-toggle:hover {
  border-color: var(--c-orange-soft);
  background: rgba(232, 106, 26, .16);
}

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

.nav-toggle-icon::before,
.nav-toggle-icon::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition:
    transform var(--t) var(--ease),
    top var(--t) var(--ease),
    bottom var(--t) var(--ease);
}

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

.nav-toggle[aria-expanded="true"] .nav-toggle-icon::before {
  top: 4px;
  transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon::after {
  bottom: 4px;
  transform: rotate(-45deg);
}

.nav-toggle-text { letter-spacing: .08em; }

/* ---------- 12. 页脚 ---------- */
.site-footer {
  position: relative;
  background: var(--c-navy-2);
  color: var(--text-night);
  border-top: 1px solid var(--line-night);
}

.site-footer::before {
  content: "";
  display: block;
  height: 3px;
  background: linear-gradient(90deg, var(--c-orange) 0 96px, rgba(245, 238, 223, .12) 96px 100%);
}

.footer-shell {
  width: min(var(--wrap), calc(100% - var(--gutter) * 2));
  margin-inline: auto;
  padding-block: clamp(2.4rem, 6vw, 4.25rem) 1.4rem;
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.4fr);
  gap: clamp(1.75rem, 4vw, 3.5rem);
  align-items: start;
}

.footer-mark {
  display: inline-block;
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--c-warm);
  text-decoration: none;
  transition: color var(--t) var(--ease);
}

.footer-mark:hover { color: var(--c-orange-soft); }

.footer-tag {
  margin-top: .4rem;
  font-size: .78rem;
  letter-spacing: .16em;
  color: var(--c-orange-soft);
}

.footer-digest {
  margin-top: .9rem;
  max-width: 38ch;
  font-size: .92rem;
  line-height: 1.85;
  color: var(--text-night-soft);
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(1.25rem, 3vw, 2.25rem);
}

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

.footer-col-title {
  margin-bottom: .9rem;
  font-family: var(--font-sans);
  font-size: .76rem;
  font-weight: 600;
  letter-spacing: .18em;
  color: var(--c-orange-soft);
}

.footer-list {
  display: grid;
  gap: .55rem;
}

.footer-link {
  display: inline-block;
  font-size: .92rem;
  color: var(--text-night);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition:
    color var(--t) var(--ease),
    border-color var(--t) var(--ease);
}

.footer-link:hover {
  color: var(--c-warm);
  border-bottom-color: var(--c-orange);
}

.footer-contact {
  display: grid;
  gap: .5rem;
}

.contact-line {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .3rem .6rem;
  font-size: .9rem;
  line-height: 1.7;
}

.contact-label {
  min-width: 4.4em;
  font-size: .76rem;
  letter-spacing: .1em;
  color: var(--text-night-soft);
}

.copy-btn {
  padding: .15rem .55rem;
  border-radius: var(--r-pill);
  border: 1px solid var(--line-night-strong);
  font-size: .72rem;
  color: var(--text-night);
  transition:
    border-color var(--t) var(--ease),
    color var(--t) var(--ease),
    background-color var(--t) var(--ease);
}

.copy-btn:hover {
  border-color: var(--c-orange-soft);
  color: var(--c-warm);
}

.copy-btn.is-done {
  border-color: var(--c-pine);
  color: #9AD6BB;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: .6rem 1.5rem;
  margin-top: clamp(2rem, 4vw, 3rem);
  padding-top: 1.2rem;
  border-top: 1px solid var(--line-night);
}

.footer-legal {
  font-size: .78rem;
  letter-spacing: .02em;
  color: var(--text-night-soft);
}

.to-top {
  position: fixed;
  right: clamp(.9rem, 2vw, 1.6rem);
  bottom: clamp(.9rem, 2vw, 1.6rem);
  z-index: 80;
  padding: .58rem 1rem .58rem .9rem;
  border-radius: var(--r-pill);
  border: 1px solid var(--line-night-strong);
  background: rgba(18, 41, 63, .95);
  color: var(--c-warm);
  font-size: .8rem;
  letter-spacing: .06em;
  opacity: 0;
  transform: translateY(8px);
  pointer-events: none;
  transition:
    opacity var(--t-slow) var(--ease),
    transform var(--t-slow) var(--ease),
    border-color var(--t) var(--ease);
}

.to-top::before { content: "↑"; margin-right: .35rem; }

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

.to-top:hover { border-color: var(--c-orange); }

/* ---------- 13. 显现动画 ---------- */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition:
    opacity var(--t-slow) var(--ease),
    transform var(--t-slow) var(--ease);
}

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

/* ---------- 14. 响应式 ---------- */
@media (max-width: 1180px) {
  .utility-links { display: none; }
}

@media (max-width: 1024px) {
  .header-shell {
    flex-wrap: wrap;
    row-gap: .55rem;
    min-height: 64px;
    padding-block: .6rem;
  }

  .brand { margin-inline-end: auto; }

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

  .header-actions {
    order: 3;
    width: 100%;
    justify-content: flex-start;
  }

  .primary-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: calc(var(--gutter) * -1);
    right: calc(var(--gutter) * -1);
    margin: 0;
    padding: .6rem var(--gutter) 1.4rem;
    background: #0F2337;
    border-top: 1px solid var(--line-night);
    border-bottom: 1px solid var(--line-night);
    box-shadow: 0 22px 40px -30px rgba(0, 0, 0, .9);
    max-height: calc(100vh - 72px);
    overflow-y: auto;
  }

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

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    overflow: visible;
  }

  .nav-link {
    display: block;
    padding: .78rem .25rem;
    border-bottom: 1px solid rgba(245, 238, 223, .08);
    font-size: 1.02rem;
  }

  .nav-link::after { bottom: .5rem; right: 100%; }
  .nav-link:hover::after { right: calc(100% - 2.4rem); }
  .nav-link[aria-current="page"]::after { right: calc(100% - 2.4rem); }
}

@media (max-width: 900px) {
  .bento > * { grid-column: span 12; }
  .footer-top { grid-template-columns: minmax(0, 1fr); }
  .footer-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 860px) {
  .grid-2,
  .grid-3,
  .grid-split { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 620px) {
  body { font-size: 15.5px; }
  .brand-line { display: none; }
  .header-actions .btn { padding: .5rem .8rem; font-size: .82rem; }
  .footer-cols { grid-template-columns: minmax(0, 1fr); }
  .footer-bottom { justify-content: flex-start; }
  .card { border-radius: var(--r-lg); }
  .media { border-radius: var(--r-lg); }
}

/* ---------- 15. 动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }

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

  .to-top { transform: none; }
}