/* =========================================================
   /assets/site.css — 6号平台中心 共享样式
   ========================================================= */

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 140px; }
body, h1, h2, h3, h4, h5, p, ul, ol, li, figure, blockquote, dl, dd { margin: 0; padding: 0; }
ul, ol { list-style: none; }
img, svg, picture, video { max-width: 100%; display: block; }
button { font: inherit; color: inherit; background: none; border: 0; }
a { color: inherit; }
table { border-collapse: collapse; }
address { font-style: normal; }

/* ---------- Tokens ---------- */
:root {
  --ink: #0A1826;
  --ink-2: #102C3A;
  --ink-3: #071320;
  --slate: #35505F;
  --mist: #AFC3CE;
  --cream: #F4EFE4;
  --cyan: #36F1CD;
  --orange: #FF8A3D;
  --moss: #738F78;
  --clay: #C6785F;
  --mineral: #DDE4E0;

  --line: rgba(53, 80, 95, .70);
  --line-soft: rgba(175, 195, 206, .16);
  --mist-70: rgba(175, 195, 206, .72);
  --glow: rgba(54, 241, 205, .32);

  --font-head: 'Space Grotesk', 'Noto Sans SC', 'PingFang SC', sans-serif;
  --font-body: 'Noto Sans SC', 'Source Han Sans SC', 'PingFang SC', sans-serif;
  --font-mono: 'IBM Plex Mono', 'JetBrains Mono', 'SFMono-Regular', monospace;

  --gutter: clamp(18px, 4vw, 64px);
  --max: 1320px;
  --r-s: 8px;
  --r-m: 16px;
  --r-l: 28px;
  --break-nav: 960px;
  --break-side: 1200px;
}

/* ---------- Base ---------- */
html { background: var(--ink); }

body {
  background: var(--ink);
  color: var(--cream);
  font-family: var(--font-body);
  font-size: clamp(15px, 1.05vw, 17px);
  line-height: 1.8;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5 {
  font-family: var(--font-head);
  font-weight: 300;
  line-height: 1.12;
  letter-spacing: -.015em;
  color: var(--cream);
}
h1 { font-size: clamp(2.4rem, 5.5vw, 4.6rem); }
h2 { font-size: clamp(1.6rem, 3vw, 2.6rem); }
h3 { font-size: clamp(1.15rem, 1.8vw, 1.4rem); font-weight: 400; }
h4 { font-size: 1.05rem; font-weight: 500; letter-spacing: .01em; }

p { text-wrap: pretty; }

strong, b { font-weight: 600; color: var(--cream); }
small { font-size: 12.5px; }

hr { border: 0; height: 1px; background: var(--line-soft); }

::selection { background: rgba(54, 241, 205, .28); color: var(--cream); }

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

/* ---------- Skip link ---------- */
.skip-link {
  position: fixed;
  top: 0;
  left: 50%;
  transform: translate(-50%, -140%);
  z-index: 400;
  padding: 10px 22px;
  border-radius: 0 0 12px 12px;
  background: var(--cyan);
  color: #04161B;
  font-family: var(--font-head);
  font-size: 14px;
  letter-spacing: .08em;
  text-decoration: none;
  transition: transform .22s ease;
}
.skip-link:focus { transform: translate(-50%, 0); }

/* =========================================================
   MASTHEAD
   ========================================================= */
.site-masthead {
  position: sticky;
  top: 0;
  z-index: 80;
  background: linear-gradient(180deg, #0B1B2A 0%, #0A1826 100%);
  border-bottom: 1px solid var(--line);
  transition: border-color .3s ease, box-shadow .3s ease;
}
.site-masthead::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: linear-gradient(90deg, rgba(53, 80, 95, .26) 1px, transparent 1px);
  background-size: clamp(48px, 7vw, 112px) 100%;
  opacity: .45;
}
.site-masthead[data-stuck="true"] {
  border-bottom-color: rgba(54, 241, 205, .42);
  box-shadow: 0 22px 48px -34px rgba(0, 0, 0, .95);
}

.masthead-inner {
  position: relative;
  z-index: 1;
  max-width: var(--max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* 刊头信息行 */
.masthead-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: 12px;
}
.masthead-edition {
  display: flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--mist-70);
}
.masthead-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(54, 241, 205, .14);
  animation: mastheadPulse 3.4s ease-in-out infinite;
}
@keyframes mastheadPulse {
  0%, 100% { opacity: .5; transform: scale(.82); }
  50% { opacity: 1; transform: scale(1); }
}

.masthead-meta-end {
  display: flex;
  align-items: center;
  gap: 12px;
}
.masthead-cta {
  display: inline-flex;
  align-items: center;
  padding: 7px 18px;
  border-radius: 999px;
  background: var(--orange);
  color: #241208;
  font-family: var(--font-head);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .1em;
  text-decoration: none;
  transition: filter .25s ease, transform .25s ease;
}
.masthead-cta:hover { filter: brightness(1.1); transform: translateY(-1px); }

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 7px 15px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--cream);
  font-family: var(--font-head);
  font-size: 12px;
  letter-spacing: .12em;
  cursor: pointer;
  transition: border-color .25s ease, color .25s ease;
}
.nav-toggle:hover { border-color: var(--cyan); color: var(--cyan); }
.nav-toggle-bars {
  position: relative;
  display: block;
  width: 16px;
  height: 10px;
}
.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 1px;
  background: currentColor;
  transition: transform .3s ease, top .3s ease, bottom .3s ease;
}
.nav-toggle-bars::before { top: 0; }
.nav-toggle-bars::after { bottom: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before { top: 4.5px; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after { bottom: 4.5px; transform: rotate(-45deg); }

/* 报头 */
.masthead-brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(10px, 1.6vw, 18px);
  padding: clamp(9px, 1.4vw, 15px) 0 clamp(7px, 1vw, 11px);
  text-decoration: none;
}
.brand-mark {
  display: grid;
  place-items: center;
  width: clamp(34px, 4vw, 46px);
  height: clamp(34px, 4vw, 46px);
  border: 1px solid rgba(54, 241, 205, .55);
  border-radius: 12px;
  background: rgba(54, 241, 205, .07);
  color: var(--cyan);
  font-family: var(--font-head);
  font-size: clamp(1.1rem, 2vw, 1.5rem);
  font-weight: 300;
  line-height: 1;
  transition: background .3s ease, transform .3s ease;
}
.masthead-brand:hover .brand-mark {
  background: rgba(54, 241, 205, .18);
  transform: rotate(-6deg);
}
.brand-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.brand-name {
  font-family: var(--font-head);
  font-size: clamp(1.05rem, 2.1vw, 1.5rem);
  font-weight: 400;
  letter-spacing: .16em;
  color: var(--cream);
  line-height: 1.2;
}
.brand-sub {
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: .3em;
  color: rgba(175, 195, 206, .62);
  line-height: 1.4;
}

/* 居中刊头导航 */
.masthead-nav {
  border-top: 1px solid var(--line-soft);
}
.nav-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: clamp(4px, 1.6vw, 32px);
}
.nav-list a {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 13px 2px;
  font-family: var(--font-head);
  font-size: 14px;
  letter-spacing: .06em;
  color: var(--mist);
  text-decoration: none;
  transition: color .25s ease;
}
.nav-list a::before {
  content: attr(data-index);
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: .04em;
  color: rgba(175, 195, 206, .42);
  transition: color .25s ease;
}
.nav-list a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 5px;
  height: 1px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .38s cubic-bezier(.2, .8, .2, 1);
}
.nav-list a:hover { color: var(--cream); }
.nav-list a:hover::before { color: var(--cyan); }
.nav-list a:hover::after { transform: scaleX(1); }
.nav-list a[aria-current="page"] { color: var(--cream); }
.nav-list a[aria-current="page"]::before { color: var(--cyan); }
.nav-list a[aria-current="page"]::after {
  transform: scaleX(1);
  background: var(--orange);
}

/* 侧边快捷通道 */
.masthead-shortcuts { display: none; }

@media (min-width: 1200px) {
  .masthead-shortcuts {
    display: flex;
    flex-direction: column;
    gap: 3px;
    position: fixed;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    z-index: 70;
    padding: 12px 9px;
    background: rgba(16, 44, 58, .95);
    border: 1px solid var(--line);
    border-right: 0;
    border-radius: 16px 0 0 16px;
    box-shadow: -18px 0 44px -32px rgba(0, 0, 0, 1);
    opacity: .62;
    transition: opacity .3s ease;
  }
  .masthead-shortcuts:hover,
  .masthead-shortcuts:focus-within { opacity: 1; }
  .masthead-shortcuts a {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 12px;
    border-radius: 10px;
    font-family: var(--font-head);
    font-size: 12px;
    letter-spacing: .16em;
    color: var(--mist);
    text-decoration: none;
    transition: background .25s ease, color .25s ease;
  }
  .masthead-shortcuts a:hover {
    background: rgba(54, 241, 205, .14);
    color: var(--cyan);
  }
  .shortcut-mark {
    font-family: var(--font-mono);
    font-size: 11px;
    opacity: .45;
    transition: transform .25s ease, opacity .25s ease;
  }
  .masthead-shortcuts a:hover .shortcut-mark {
    opacity: 1;
    transform: translateX(2px);
  }
}

/* 移动端导航 */
@media (max-width: 960px) {
  .nav-toggle { display: inline-flex; }

  .masthead-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    z-index: 2;
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    padding: 0 var(--gutter);
    background: linear-gradient(180deg, #0F2A38 0%, #0A1826 100%);
    border-top: 1px solid var(--line);
    transition: max-height .42s cubic-bezier(.2, .8, .2, 1), opacity .28s ease, padding .3s ease;
  }
  .masthead-nav[data-open="true"] {
    max-height: 78vh;
    overflow-y: auto;
    opacity: 1;
    padding: 14px var(--gutter) 24px;
  }
  .nav-list {
    flex-direction: column;
    gap: 0;
  }
  .nav-list a {
    width: 100%;
    padding: 14px 0;
    font-size: 15px;
    border-bottom: 1px solid var(--line-soft);
  }
  .nav-list a::after { bottom: 0; }
}
@media (max-width: 600px) {
  .masthead-cta { display: none; }
  .brand-sub { letter-spacing: .22em; }
}

/* =========================================================
   FOOTER
   ========================================================= */
.site-footer {
  position: relative;
  margin-top: clamp(64px, 10vw, 140px);
  overflow: hidden;
  background:
    radial-gradient(90% 120% at 12% 0%, rgba(54, 241, 205, .07), transparent 58%),
    radial-gradient(70% 100% at 88% 100%, rgba(255, 138, 61, .08), transparent 62%),
    var(--ink-2);
  border-top: 1px solid var(--line);
  color: var(--cream);
}
.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--cyan) 28%, rgba(255, 138, 61, .85) 72%, transparent);
  opacity: .6;
}
.site-footer::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(53, 80, 95, .18) 1px, transparent 1px),
    linear-gradient(90deg, rgba(53, 80, 95, .18) 1px, transparent 1px);
  background-size: 88px 88px;
  opacity: .3;
}

.footer-inner {
  position: relative;
  z-index: 1;
  max-width: var(--max);
  margin-inline: auto;
  padding: clamp(44px, 6vw, 82px) var(--gutter) 0;
}

.footer-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 18px 32px;
  padding-bottom: clamp(26px, 3.6vw, 42px);
  border-bottom: 1px solid var(--line-soft);
}
.footer-kicker {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .24em;
  color: var(--cyan);
}
.footer-kicker::before {
  content: "";
  width: 26px;
  height: 1px;
  background: var(--cyan);
}
.footer-lede {
  margin-top: 10px;
  max-width: 54ch;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.25fr 1.65fr 1.2fr;
  gap: clamp(24px, 4vw, 60px);
  padding: clamp(32px, 4.5vw, 58px) 0;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-mark {
  display: grid;
  place-items: center;
  width: 52px;
  height: 52px;
  border: 1px solid rgba(54, 241, 205, .42);
  border-radius: 14px;
  background: rgba(54, 241, 205, .07);
  color: var(--cyan);
  font-family: var(--font-head);
  font-size: 1.6rem;
  font-weight: 200;
  line-height: 1;
}
.footer-name {
  font-family: var(--font-head);
  font-size: 1.12rem;
  letter-spacing: .14em;
  color: var(--cream);
}
.footer-note {
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist-70);
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(16px, 3vw, 32px);
}
.footer-col-title {
  padding-bottom: 11px;
  margin-bottom: 13px;
  border-bottom: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 400;
  letter-spacing: .22em;
  color: var(--mist-70);
}
.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 9px;
}
.footer-col a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  color: rgba(244, 239, 228, .78);
  text-decoration: none;
  transition: color .25s ease, transform .25s ease;
}
.footer-col a::before {
  content: "·";
  color: var(--clay);
  opacity: 0;
  transition: opacity .25s ease;
}
.footer-col a:hover {
  color: var(--cyan);
  transform: translateX(2px);
}
.footer-col a:hover::before { opacity: 1; }

.footer-contact ul {
  display: flex;
  flex-direction: column;
  gap: 13px;
}
.footer-contact li {
  display: flex;
  flex-direction: column;
  gap: 2px;
  font-size: 14px;
  line-height: 1.65;
  color: rgba(244, 239, 228, .82);
  word-break: break-word;
}
.contact-key {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .2em;
  color: var(--mist-70);
}

.footer-timeline {
  padding: clamp(26px, 3.5vw, 44px) 0 clamp(28px, 4vw, 46px);
  border-top: 1px solid var(--line-soft);
}
.timeline-track {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(14px, 3vw, 40px);
}
.timeline-node {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-top: 20px;
  border-top: 1px solid rgba(175, 195, 206, .22);
  transition: border-color .3s ease;
}
.timeline-node::before {
  content: "";
  position: absolute;
  top: -5px;
  left: 0;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink-2);
  border: 1px solid var(--cyan);
  transition: background .3s ease, box-shadow .3s ease;
}
.timeline-node:last-child::before { border-color: var(--orange); }
.timeline-node:hover { border-top-color: rgba(54, 241, 205, .55); }
.timeline-node:hover::before {
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(54, 241, 205, .16);
}
.timeline-index {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--orange);
}
.timeline-label {
  font-family: var(--font-head);
  font-size: 15px;
  letter-spacing: .05em;
  color: var(--cream);
}
.timeline-desc {
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--mist-70);
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  padding: clamp(20px, 3vw, 28px) 0 clamp(24px, 3vw, 34px);
  border-top: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--mist-70);
}
.footer-copy,
.footer-icp { line-height: 1.6; }
.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}
.footer-legal a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .25s ease, border-color .25s ease;
}
.footer-legal a:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

@media (max-width: 960px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
  .footer-nav { grid-column: 1 / -1; }
  .timeline-track { grid-template-columns: 1fr; gap: 20px; }
}
@media (max-width: 620px) {
  .footer-grid { grid-template-columns: 1fr; }
  .footer-nav { grid-template-columns: 1fr 1fr; }
  .footer-base { flex-direction: column; align-items: flex-start; }
  .footer-legal { gap: 14px; }
}

/* =========================================================
   SHARED UTILITIES
   ========================================================= */
.shell {
  width: 100%;
  max-width: var(--max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.section { padding-block: clamp(48px, 7vw, 110px); }
.prose { max-width: 68ch; }
.prose p + p { margin-top: 1.1em; }

.display {
  font-family: var(--font-head);
  font-weight: 200;
  font-size: clamp(3.5rem, 9vw, 9rem);
  line-height: .92;
  letter-spacing: -.04em;
  color: var(--cream);
}
.h1 { font-family: var(--font-head); font-weight: 300; font-size: clamp(2.4rem, 5.5vw, 4.6rem); line-height: 1.08; }
.h2 { font-family: var(--font-head); font-weight: 300; font-size: clamp(1.6rem, 3vw, 2.6rem); line-height: 1.14; }
.h3 { font-family: var(--font-head); font-weight: 400; font-size: clamp(1.15rem, 1.8vw, 1.4rem); }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--cyan);
}
.lede {
  max-width: 56ch;
  font-size: clamp(1rem, 1.4vw, 1.15rem);
  line-height: 1.75;
  color: var(--mist);
}
.hr { height: 1px; background: var(--line-soft); border: 0; }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: 999px;
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .14em;
  color: var(--mist);
  white-space: nowrap;
}
.tag--warm { border-color: rgba(255, 138, 61, .5); color: var(--orange); }
.tag--cyan { border-color: rgba(54, 241, 205, .5); color: var(--cyan); }

/* 面包屑 */
.crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--mist-70);
}
.crumb li { display: inline-flex; align-items: center; gap: 8px; }
.crumb a { color: inherit; text-decoration: none; transition: color .25s ease; }
.crumb a:hover { color: var(--cyan); }
.crumb li + li::before {
  content: "/";
  color: var(--slate);
}
.crumb [aria-current="page"] { color: var(--cream); }

/* 按钮 */
.btn {
  --btn-bg: transparent;
  --btn-fg: var(--cream);
  --btn-bd: var(--line);
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 26px;
  border: 1px solid var(--btn-bd);
  border-radius: 999px;
  background: var(--btn-bg);
  color: var(--btn-fg);
  font-family: var(--font-head);
  font-size: 14px;
  letter-spacing: .08em;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  transition: background .25s ease, color .25s ease, border-color .25s ease, transform .25s ease, box-shadow .25s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn--accent {
  --btn-bg: var(--cyan);
  --btn-fg: #04161B;
  --btn-bd: var(--cyan);
  font-weight: 600;
}
.btn--accent:hover { box-shadow: 0 12px 34px -16px var(--glow); }
.btn--warm {
  --btn-bg: var(--orange);
  --btn-fg: #22120A;
  --btn-bd: var(--orange);
  font-weight: 600;
}
.btn--warm:hover { filter: brightness(1.08); }
.btn--line { --btn-bd: rgba(175, 195, 206, .45); }
.btn--line:hover {
  --btn-bg: rgba(54, 241, 205, .1);
  --btn-bd: var(--cyan);
  --btn-fg: var(--cyan);
}

/* 网格 */
.grid-2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: clamp(16px, 2.5vw, 32px); }
.grid-3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: clamp(16px, 2.5vw, 32px); }
.split {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  gap: clamp(20px, 4vw, 56px);
  align-items: start;
}
.split--rev { grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); }

@media (max-width: 900px) {
  .grid-2, .grid-3, .split, .split--rev { grid-template-columns: 1fr; }
}

/* 图片容器（页面阶段放置 img / svg / picture） */
.media {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-m);
  background:
    linear-gradient(135deg, rgba(53, 80, 95, .55) 0%, rgba(16, 44, 58, .95) 60%, rgba(10, 24, 38, 1) 100%);
}
.media > img,
.media > svg,
.media > picture,
.media > picture > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.media--wide { aspect-ratio: 21 / 9; }
.media--tall { aspect-ratio: 3 / 4; }
.media--square { aspect-ratio: 1 / 1; }
.media--bare { aspect-ratio: auto; border: 0; border-radius: 0; background: none; }
.media__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--mist);
  background: linear-gradient(180deg, transparent, rgba(7, 19, 32, .88));
}

/* 滚动进度条 */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0;
  height: 2px;
  z-index: 300;
  pointer-events: none;
  background: linear-gradient(90deg, var(--cyan), var(--orange));
  transition: width .08s linear;
}

/* ---------- 可访问性 ---------- */
@media (max-width: 960px) {
  html { scroll-padding-top: 108px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
  .scroll-progress { transition: none; }
}