/* ==========================================================================
   军体育官网 · 共享样式表 /assets/site.css
   战术面板 × 编辑部版式
   ========================================================================== */

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

html {
  -webkit-text-size-adjust: 100%;
  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, canvas { display: block; max-width: 100%; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }
table { border-collapse: collapse; width: 100%; }
summary { list-style: none; }
summary::-webkit-details-marker { display: none; }

/* ---------- 2. 设计令牌 ---------- */
:root {
  /* 色彩 */
  --mil-green: #3B4A2F;
  --mil-green-deep: #2A3621;
  --navy: #1C2A39;
  --navy-deep: #121B26;
  --signal: #FF6B35;
  --signal-dark: #C24A1F;
  --cream: #F4EFE6;
  --white: #FFFFFF;
  --volt: #B7FF2A;
  --ink: #141210;
  --slate: #2C3E50;
  --warm-gray: #8A8F98;

  /* 尺寸 */
  --rail: 76px;
  --shell: 1280px;

  /* 字体 */
  --font-display: "Impact", "Haettenschweiler", "Arial Black", "PingFang SC",
                  "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-body: "Helvetica Neue", "PingFang SC", "Hiragino Sans GB",
               "Microsoft YaHei", "Segoe UI", Arial, sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", Menlo, Consolas,
               "Courier New", "PingFang SC", monospace;

  --ease: cubic-bezier(.22, .61, .36, 1);
}

@media (max-width: 1180px) { :root { --rail: 68px; } }

/* ---------- 3. 页面骨架 ---------- */
body {
  min-height: 100vh;
  padding-left: var(--rail);
  background-color: var(--navy);
  background-image:
    radial-gradient(circle at 16% 10%, rgba(59, 74, 47, .55), transparent 44%),
    radial-gradient(circle at 84% 76%, rgba(44, 62, 80, .55), transparent 50%),
    repeating-linear-gradient(0deg, rgba(255, 255, 255, .017) 0 1px, transparent 1px 3px),
    repeating-linear-gradient(90deg, rgba(255, 255, 255, .013) 0 1px, transparent 1px 3px);
  background-attachment: fixed;
  color: var(--cream);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  word-break: break-word;
}

.shell {
  width: min(100% - 2.5rem, var(--shell));
  margin-inline: auto;
}

main { display: block; }

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

:focus-visible {
  outline: 3px solid var(--volt);
  outline-offset: 2px;
}

.sr-only {
  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: fixed;
  top: -110px;
  left: calc(var(--rail) + 14px);
  z-index: 999;
  padding: .7rem 1.15rem;
  background: var(--volt);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .12em;
  transition: top .22s var(--ease);
}
.skip-link:focus { top: 14px; }

/* ---------- 4. 滚动进度条 ---------- */
.scroll-meter {
  position: fixed;
  top: 0;
  left: var(--rail);
  right: 0;
  height: 3px;
  z-index: 90;
  background: var(--signal);
  transform: scaleX(0);
  transform-origin: left center;
  pointer-events: none;
}

/* ---------- 5. 左侧战术导轨 ---------- */
.tactical-rail {
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  width: var(--rail);
  z-index: 70;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: .1rem;
  background: linear-gradient(180deg, #2f3c25 0%, #1c2616 55%, #141a11 100%);
  border-right: 1px solid rgba(183, 255, 42, .18);
}

.rail-item {
  position: relative;
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .32rem;
  padding: .95rem .25rem;
  color: rgba(244, 239, 230, .74);
  font-family: var(--font-mono);
  font-size: .58rem;
  letter-spacing: .1em;
  line-height: 1.25;
  text-align: center;
  transition: color .2s var(--ease), background .2s var(--ease);
}
.rail-item + .rail-item::before {
  content: "";
  position: absolute;
  top: 0; left: 26%; right: 26%;
  height: 1px;
  background: rgba(244, 239, 230, .14);
}
.rail-item svg {
  width: 20px; height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.6;
  stroke-linecap: square;
}
.rail-item:hover,
.rail-item:focus-visible { color: var(--volt); background: rgba(183, 255, 42, .07); }

/* ---------- 6. 页头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: linear-gradient(180deg, #37452b 0%, #26301d 100%);
  border-bottom: 1px solid rgba(183, 255, 42, .2);
  box-shadow: 0 14px 34px -18px rgba(6, 10, 16, .85);
}

/* 6.1 实用条 */
.header-utility {
  max-height: 46px;
  overflow: hidden;
  background: var(--ink);
  border-bottom: 1px solid rgba(244, 239, 230, .08);
  opacity: 1;
  transition: max-height .3s var(--ease), opacity .25s var(--ease);
}
.site-header[data-scrolled] .header-utility { max-height: 0; opacity: 0; }

.header-utility__inner {
  width: min(100% - 2rem, var(--shell));
  margin-inline: auto;
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .1em;
  color: var(--warm-gray);
}

.status-line {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  white-space: nowrap;
}
.status-line__text { color: rgba(244, 239, 230, .72); }

.status-dot {
  display: inline-block;
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--volt);
  box-shadow: 0 0 0 0 rgba(183, 255, 42, .55);
  animation: pulse 2.6s infinite;
  flex: none;
}
@keyframes pulse {
  0%   { box-shadow: 0 0 0 0 rgba(183, 255, 42, .5); }
  70%  { box-shadow: 0 0 0 8px rgba(183, 255, 42, 0); }
  100% { box-shadow: 0 0 0 0 rgba(183, 255, 42, 0); }
}

.league-strip {
  display: flex;
  align-items: center;
  gap: .1rem;
  flex-wrap: wrap;
  justify-content: center;
}
.league-strip a {
  display: block;
  padding: .28rem .68rem;
  color: rgba(244, 239, 230, .7);
  letter-spacing: .14em;
  border: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease), background .2s var(--ease);
}
.league-strip a:hover,
.league-strip a:focus-visible {
  color: var(--volt);
  border-color: rgba(183, 255, 42, .38);
  background: rgba(183, 255, 42, .06);
}

.cmp-entry {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  white-space: nowrap;
  color: var(--signal);
  font-weight: 700;
  letter-spacing: .1em;
  transition: color .2s var(--ease);
}
.cmp-entry::after { content: "▸"; font-size: .7em; }
.cmp-entry:hover,
.cmp-entry:focus-visible { color: var(--volt); }

/* 6.2 刊头 */
.masthead { padding-block: clamp(.85rem, 2vw, 1.4rem); transition: padding .3s var(--ease); }
.site-header[data-scrolled] .masthead { padding-block: .55rem; }

.masthead__inner {
  position: relative;
  width: min(100% - 2rem, var(--shell));
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: .7rem;
}

.masthead__brand {
  font-family: var(--font-display);
  font-size: clamp(1.55rem, 3.4vw, 2.5rem);
  line-height: 1;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--cream);
  transition: font-size .3s var(--ease);
}
.site-header[data-scrolled] .masthead__brand { font-size: clamp(1.2rem, 2.2vw, 1.65rem); }
.masthead__brand a { display: inline-block; }
.masthead__brand a:hover,
.masthead__brand a:focus-visible { color: var(--volt); }

.masthead__aside {
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: .62rem;
  letter-spacing: .3em;
  line-height: 1;
  color: var(--volt);
  opacity: .78;
  align-self: center;
}

/* 6.3 移动开关 */
.nav-toggle {
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  display: none;
  align-items: center;
  gap: .5rem;
  padding: .5rem .72rem;
  border: 1px solid rgba(244, 239, 230, .26);
  color: var(--cream);
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .16em;
  transition: border-color .2s var(--ease), color .2s var(--ease);
}
.nav-toggle:hover,
.nav-toggle:focus-visible { border-color: var(--volt); color: var(--volt); }

.nav-toggle__bars { display: grid; gap: 3px; width: 16px; }
.nav-toggle__bars i {
  display: block;
  height: 2px;
  background: currentColor;
  transition: transform .26s var(--ease), opacity .2s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

/* 6.4 主导航 */
.primary-nav {
  background: rgba(12, 15, 11, .52);
  border-top: 1px solid rgba(244, 239, 230, .1);
}

.primary-nav__list {
  width: min(100% - 2rem, var(--shell));
  margin-inline: auto;
  display: flex;
  justify-content: center;
  align-items: stretch;
  gap: clamp(.2rem, 2vw, 1.8rem);
}

.primary-nav__link {
  position: relative;
  display: block;
  padding: .82rem .35rem .76rem;
  font-size: .95rem;
  letter-spacing: .16em;
  color: rgba(244, 239, 230, .82);
  transition: color .2s var(--ease);
}
.primary-nav__link::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 3px;
  background: var(--signal);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .3s var(--ease);
}
.primary-nav__link:hover,
.primary-nav__link:focus-visible { color: var(--white); }
.primary-nav__link:hover::after,
.primary-nav__link:focus-visible::after { transform: scaleX(1); }

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

/* ---------- 7. 页脚 ---------- */
.site-footer {
  margin-top: clamp(3rem, 7vw, 7rem);
  padding-top: clamp(2.5rem, 5vw, 4.5rem);
  background: linear-gradient(180deg, #16212e 0%, #0e151d 100%);
  border-top: 3px solid var(--signal);
  color: var(--cream);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.15fr 1fr 1.3fr;
  gap: clamp(1.6rem, 4vw, 4rem);
}

.footer-brand__mark {
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 2.8vw, 2rem);
  line-height: 1.1;
  letter-spacing: .14em;
}
.footer-brand__slogan {
  margin-top: .45rem;
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .26em;
  color: var(--signal);
}
.footer-brand__area {
  margin-top: 1.1rem;
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .34rem .75rem;
  border: 1px solid rgba(138, 143, 152, .38);
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .12em;
  color: rgba(244, 239, 230, .8);
}
.footer-brand__note {
  margin-top: 1rem;
  max-width: 34ch;
  font-size: .86rem;
  line-height: 1.75;
  color: rgba(244, 239, 230, .6);
}

.footer-nav__title,
.footer-contact__title {
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--volt);
  margin-bottom: .9rem;
}
.footer-nav__title--gap { margin-top: 1.6rem; }

.footer-nav__list { display: grid; gap: .55rem; }
.footer-nav__list a {
  font-size: .92rem;
  color: rgba(244, 239, 230, .78);
  transition: color .2s var(--ease), padding-left .2s var(--ease);
}
.footer-nav__list a:hover,
.footer-nav__list a:focus-visible { color: var(--signal); padding-left: .3rem; }

.footer-contact__list { display: grid; gap: .85rem; }
.footer-contact__row dt {
  font-family: var(--font-mono);
  font-size: .66rem;
  letter-spacing: .18em;
  color: var(--warm-gray);
}
.footer-contact__row dd {
  margin-top: .18rem;
  font-size: .92rem;
  color: rgba(244, 239, 230, .92);
  line-height: 1.6;
}
.footer-contact__note {
  margin-top: 1rem;
  padding-left: .85rem;
  border-left: 2px solid var(--signal);
  font-size: .82rem;
  line-height: 1.75;
  color: rgba(244, 239, 230, .62);
}

.footer-check {
  margin-top: clamp(2rem, 4vw, 3rem);
  border-top: 1px solid rgba(244, 239, 230, .12);
}
.footer-check details { border-bottom: 1px solid rgba(244, 239, 230, .12); }
.footer-check summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.05rem 0;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .2em;
  color: var(--cream);
}
.footer-check summary::after { content: "+"; color: var(--signal); font-size: 1rem; line-height: 1; }
.footer-check details[open] summary::after { content: "–"; }
.footer-check__list { display: grid; gap: .55rem; padding-bottom: 1.3rem; }
.footer-check__list li {
  display: flex;
  gap: .6rem;
  font-size: .88rem;
  color: rgba(244, 239, 230, .76);
}
.footer-check__list li::before { content: "▸"; color: var(--volt); flex: none; }

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: .6rem;
  padding-block: 1.4rem calc(1.4rem + env(safe-area-inset-bottom, 0px));
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .1em;
  color: var(--warm-gray);
}

/* ---------- 8. 通用分区与容器 ---------- */
.band {
  position: relative;
  padding-block: clamp(2.5rem, 6vw, 6rem);
}
.band--paper { background: var(--cream); color: var(--ink); }
.band--deep { background: var(--navy-deep); }
.band--slate { background: var(--slate); }
.band--green { background: linear-gradient(160deg, var(--mil-green), var(--mil-green-deep)); }
.band--shear { clip-path: polygon(0 0, 100% 0, 100% calc(100% - 3vw), 0 100%); }
.band--shear-top { clip-path: polygon(0 3vw, 100% 0, 100% 100%, 0 100%); }

.paper { background: var(--cream); color: var(--ink); }

/* ---------- 9. 排版工具 ---------- */
.kicker {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .28em;
  text-transform: uppercase;
  color: var(--signal);
}

.data-num {
  font-family: var(--font-mono);
  font-style: italic;
  font-weight: 700;
  font-size: clamp(2rem, 5vw, 3.4rem);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--signal);
}

.note-vertical {
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: .66rem;
  letter-spacing: .26em;
  color: var(--warm-gray);
}

.prose {
  max-width: 68ch;
  font-size: 1.0625rem;
  line-height: 1.85;
}
.prose > * + * { margin-top: 1.1em; }
.prose h2 { font-size: clamp(1.4rem, 3vw, 2rem); line-height: 1.25; letter-spacing: .02em; }
.prose h3 { font-size: 1.15rem; line-height: 1.35; }
.prose ul, .prose ol { padding-left: 1.2rem; }
.prose ul { list-style: square; }
.prose ol { list-style: decimal; }
.prose li + li { margin-top: .4em; }
.prose a { color: var(--signal-dark); text-decoration: underline; text-underline-offset: 3px; }
.prose code {
  font-family: var(--font-mono);
  font-size: .9em;
  padding: .12em .38em;
  background: rgba(20, 18, 16, .07);
}
.band--deep .prose, .band--slate .prose, .band--green .prose { color: rgba(244, 239, 230, .88); }
.band--deep .prose a, .band--slate .prose a { color: var(--volt); }

/* ---------- 10. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .55rem;
  padding: .85rem 1.5rem;
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  border: 1px solid transparent;
  transition: background .2s var(--ease), color .2s var(--ease),
              border-color .2s var(--ease), transform .2s var(--ease);
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }

.btn--signal { background: var(--signal); color: var(--ink); font-weight: 700; }
.btn--signal:hover, .btn--signal:focus-visible { background: var(--signal-dark); color: var(--white); }

.btn--volt { background: var(--volt); color: var(--ink); font-weight: 700; }
.btn--volt:hover, .btn--volt:focus-visible { background: var(--white); color: var(--ink); }

.btn--ghost { border-color: rgba(244, 239, 230, .35); color: var(--cream); }
.btn--ghost:hover, .btn--ghost:focus-visible { border-color: var(--volt); color: var(--volt); }
.band--paper .btn--ghost { border-color: rgba(20, 18, 16, .34); color: var(--ink); }
.band--paper .btn--ghost:hover,
.band--paper .btn--ghost:focus-visible { border-color: var(--signal); color: var(--signal-dark); }

/* ---------- 11. 状态标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  padding: .26rem .6rem;
  font-family: var(--font-mono);
  font-size: .66rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  border: 1px solid currentColor;
  line-height: 1.4;
}
.tag--live { color: var(--volt); }
.tag--hot { color: var(--signal); }
.tag--muted { color: var(--warm-gray); }
.tag--ink { color: var(--ink); }

/* ---------- 12. 面板与网格 ---------- */
.panel {
  padding: clamp(1.25rem, 2.5vw, 1.9rem);
  background: var(--cream);
  color: var(--ink);
  border: 1px solid rgba(20, 18, 16, .14);
  box-shadow: 0 1px 0 rgba(20, 18, 16, .05),
              0 18px 34px -26px rgba(6, 10, 16, .95);
}
.panel--dark {
  background: var(--navy-deep);
  color: var(--cream);
  border-color: rgba(183, 255, 42, .2);
}
.panel--slate {
  background: var(--slate);
  color: var(--cream);
  border-color: rgba(244, 239, 230, .16);
}
.panel--rail { border-left: 4px solid var(--signal); }

.grid {
  display: grid;
  gap: clamp(1rem, 2.5vw, 2rem);
}
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

/* ---------- 13. 图片容器基座 ---------- */
.figure-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  background:
    linear-gradient(140deg, var(--slate) 0%, #16212e 55%, var(--mil-green-deep) 100%);
  border: 1px solid rgba(244, 239, 230, .14);
}
.figure-frame img,
.figure-frame picture,
.figure-frame > img,
.figure-frame > picture > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: contrast(1.12) saturate(.9) brightness(.92);
}
.figure-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 50% 44%, transparent 38%, rgba(8, 12, 18, .58) 100%);
  pointer-events: none;
}
.figure-frame--portrait { aspect-ratio: 3 / 4; }
.figure-frame--square { aspect-ratio: 1 / 1; }
.figure-frame--wide { aspect-ratio: 21 / 9; }
.band--paper .figure-frame { border-color: rgba(20, 18, 16, .14); }

/* ---------- 14. 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .5rem;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .12em;
  color: var(--warm-gray);
}
.breadcrumb li { display: inline-flex; align-items: center; gap: .5rem; }
.breadcrumb li + li::before { content: "/"; color: rgba(138, 143, 152, .5); }
.breadcrumb a { color: inherit; transition: color .2s var(--ease); }
.breadcrumb a:hover,
.breadcrumb a:focus-visible { color: var(--volt); }
.band--paper .breadcrumb { color: rgba(20, 18, 16, .55); }
.band--paper .breadcrumb a:hover,
.band--paper .breadcrumb a:focus-visible { color: var(--signal-dark); }

/* ---------- 15. 显现动效协议 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .55s var(--ease), transform .55s var(--ease);
}
[data-reveal][data-revealed] { opacity: 1; transform: none; }

/* ---------- 16. 响应式 ---------- */
@media (max-width: 1024px) {
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-contact { grid-column: 1 / -1; }
  .footer-brand__note { max-width: 100%; }
}

@media (max-width: 900px) {
  :root { --rail: 0px; }

  body {
    padding-left: 0;
    padding-bottom: calc(62px + env(safe-area-inset-bottom, 0px));
  }

  .scroll-meter { left: 0; }

  .skip-link { left: 14px; }

  .tactical-rail {
    top: auto;
    bottom: 0;
    left: 0;
    right: 0;
    width: 100%;
    height: calc(62px + env(safe-area-inset-bottom, 0px));
    padding-bottom: env(safe-area-inset-bottom, 0px);
    flex-direction: row;
    justify-content: space-around;
    align-items: center;
    border-right: 0;
    border-top: 1px solid rgba(183, 255, 42, .22);
  }
  .rail-item { width: auto; flex: 1 1 0; padding: .38rem .2rem; font-size: .55rem; }
  .rail-item + .rail-item::before { display: none; }
  .rail-item svg { width: 17px; height: 17px; }

  .header-utility__inner {
    flex-wrap: wrap;
    justify-content: center;
    min-height: 0;
    padding-block: .5rem;
    gap: .5rem .75rem;
  }
  .league-strip { order: 3; width: 100%; }
  .header-utility { max-height: 132px; }
  .cmp-entry { display: none; }

  .masthead__aside { display: none; }
  .nav-toggle { display: inline-flex; }

  .primary-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    max-height: 0;
    overflow: hidden;
    background: var(--ink);
    border-top: 1px solid rgba(183, 255, 42, .18);
    transition: max-height .34s var(--ease);
  }
  .primary-nav[data-open] {
    max-height: 74vh;
    overflow-y: auto;
  }
  .primary-nav__list {
    width: 100%;
    flex-direction: column;
    gap: 0;
    padding-block: .25rem;
  }
  .primary-nav__link {
    padding: .95rem 1.4rem;
    border-bottom: 1px solid rgba(244, 239, 230, .08);
    letter-spacing: .18em;
  }
  .primary-nav__link::after { display: none; }
  .primary-nav__link[aria-current="page"] { border-left: 3px solid var(--signal); }
}

@media (max-width: 640px) {
  body { font-size: 15.5px; }
  .shell { width: min(100% - 1.75rem, var(--shell)); }
  .masthead__inner { width: min(100% - 1.75rem, var(--shell)); }
  .grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-base { font-size: .66rem; }
  .footer-base p { width: 100%; }
  .btn { width: 100%; }
}

/* ---------- 17. 动效降级 ---------- */
@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;
  }
  [data-reveal] { opacity: 1; transform: none; }
  .status-dot { animation: none; }
  .btn:hover { transform: none; }
}