/* ================= 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,h6,p,ul,ol,li,figure,blockquote,dl,dd,address{margin:0;padding:0}
ul,ol{list-style:none}
img,svg,video{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;cursor:pointer}
address{font-style:normal}
table{border-collapse:collapse;width:100%}
[id]{scroll-margin-top:7rem}

:focus-visible{
  outline:2px solid var(--focus-ring);
  outline-offset:3px;
  border-radius:8px;
}

/* ================= 2. 变量 ================= */
:root{
  /* 色彩 */
  --bg-night-turf:#07130F;
  --turf-panel:#0E2A22;
  --turf-raise:#14382C;
  --line-soft:#1F4A3C;
  --glow-blue:#4FE3FF;
  --glow-blue-deep:#1C9BB8;
  --amber-flag:#FFB454;
  --chalk:#E8F2EC;
  --chalk-dim:#9FB6AB;
  --paper-mint:#EAF0EA;
  --ink-solid:#0B1F19;
  --focus-ring:#8CFFE0;

  /* 字体 */
  --font-display:"Oswald","Archivo Narrow","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Source Han Serif SC","Noto Serif SC","Songti SC",Georgia,"Microsoft YaHei",serif;
  --font-mono:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  /* 字号 */
  --type-round:clamp(3.5rem,9vw,8rem);
  --type-h1:clamp(2rem,4vw,3.25rem);
  --type-h2:1.5rem;
  --type-body:1rem;
  --type-meta:.8125rem;

  /* 空间与形状 */
  --gutter:clamp(1rem,4vw,2.5rem);
  --shell:1200px;
  --radius-lg:28px;
  --radius-md:18px;
  --radius-pill:999px;
  --tilt-a:-6deg;
  --tilt-b:4deg;
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ================= 3. 基础排版 ================= */
body{
  min-height:100vh;
  background-color:var(--bg-night-turf);
  background-image:
    radial-gradient(110% 70% at 8% -12%, rgba(79,227,255,.10), transparent 62%),
    radial-gradient(85% 55% at 100% 2%, rgba(255,180,84,.055), transparent 60%),
    repeating-linear-gradient(112deg, rgba(31,74,60,.30) 0 1px, rgba(31,74,60,0) 1px 10px);
  color:var(--chalk);
  font-family:var(--font-body);
  font-size:var(--type-body);
  line-height:1.85;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
}

h1,h2,h3,h4,h5,h6,.font-display{
  font-family:var(--font-display);
  font-weight:700;
  line-height:1.16;
  letter-spacing:-.02em;
  color:var(--chalk);
}
h1{font-size:var(--type-h1)}
h2{font-size:var(--type-h2)}
h3{font-size:1.125rem}

.mono,.num{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-feature-settings:"tnum" 1;
}

::selection{background:rgba(79,227,255,.28);color:var(--chalk)}

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

.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;
}

/* ================= 5. skip link ================= */
.skip-link{
  position:absolute;
  top:-120px;
  left:var(--gutter);
  z-index:120;
  padding:.6rem 1.1rem;
  border-radius:var(--radius-pill);
  background:var(--glow-blue);
  color:var(--ink-solid);
  font-family:var(--font-display);
  font-weight:700;
  font-size:.875rem;
  transition:top .2s var(--ease);
}
.skip-link:focus{top:.75rem}

/* ================= 6. 页头 ================= */
.site-header{
  position:sticky;
  top:0;
  z-index:60;
  background:linear-gradient(180deg, rgba(7,19,15,.97), rgba(7,19,15,.90));
  border-bottom:1px solid var(--line-soft);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
}

/* —— 上层：品牌说明与口径状态 —— */
.hdr-upper{
  border-bottom:1px solid rgba(31,74,60,.75);
  background:linear-gradient(180deg, rgba(14,42,34,.72), rgba(7,19,15,.20));
  transition:background .3s var(--ease);
}
.hdr-upper-inner{
  display:flex;
  align-items:center;
  flex-wrap:wrap;
  gap:.45rem 1.25rem;
  padding-block:.7rem;
  transition:padding .3s var(--ease);
}
.hdr-brand{
  display:inline-flex;
  align-items:center;
  gap:.55rem;
  font-family:var(--font-display);
  font-weight:700;
  letter-spacing:-.01em;
  color:var(--chalk);
}
.hdr-brand:hover .hdr-brand-name{color:var(--glow-blue)}
.hdr-mark{
  width:.75rem;
  height:.75rem;
  border-radius:4px;
  background:linear-gradient(135deg, var(--glow-blue), var(--glow-blue-deep));
  box-shadow:0 0 12px rgba(79,227,255,.75);
}
.hdr-brand-name{
  font-size:1.0625rem;
  transition:color .2s var(--ease);
}
.hdr-tagline,
.hdr-utility{
  overflow:hidden;
  white-space:nowrap;
  text-overflow:ellipsis;
  font-family:var(--font-mono);
  font-size:var(--type-meta);
  letter-spacing:.08em;
  color:var(--chalk-dim);
}
.hdr-tagline{
  max-width:22rem;
  transition:opacity .25s var(--ease), max-width .35s var(--ease), margin .35s var(--ease);
}
.hdr-utility{
  margin-left:.25rem;
  max-width:24rem;
  font-size:.75rem;
  transition:opacity .25s var(--ease), max-width .35s var(--ease);
}
.hdr-status{
  margin-left:auto;
  display:inline-flex;
  align-items:center;
  gap:.45rem;
  padding:.28rem .78rem;
  border-radius:var(--radius-pill);
  border:1px solid rgba(28,155,184,.55);
  background:rgba(28,155,184,.12);
  color:var(--glow-blue);
  font-family:var(--font-mono);
  font-size:.75rem;
  letter-spacing:.06em;
  white-space:nowrap;
}
.hdr-status::before{
  content:"";
  width:6px;
  height:6px;
  border-radius:50%;
  background:var(--glow-blue);
  box-shadow:0 0 8px var(--glow-blue);
  animation:hdr-pulse 2.6s ease-in-out infinite;
}
@keyframes hdr-pulse{
  0%,100%{opacity:1}
  50%{opacity:.3}
}

/* 滚动后：上层收成一行状态胶囊 */
.site-header[data-condensed="true"] .hdr-upper-inner{padding-block:.32rem}
.site-header[data-condensed="true"] .hdr-tagline,
.site-header[data-condensed="true"] .hdr-utility{
  opacity:0;
  max-width:0;
  margin-left:0;
  pointer-events:none;
}
.site-header[data-condensed="true"] .hdr-upper{border-bottom-color:transparent}

/* —— 下层：栏目条 —— */
.hdr-lower-inner{
  display:flex;
  align-items:center;
  gap:.75rem;
  padding-block:.5rem .65rem;
}
.hdr-nav{
  flex:1 1 auto;
  min-width:0;
}
.hdr-nav-list{
  display:flex;
  align-items:center;
  flex-wrap:wrap;
  gap:.25rem;
}
.hdr-nav-item{display:block}
.hdr-link{
  display:inline-flex;
  align-items:baseline;
  gap:.45rem;
  padding:.45rem .8rem;
  border-radius:var(--radius-pill);
  border:1px solid transparent;
  color:var(--chalk-dim);
  font-family:var(--font-display);
  font-weight:500;
  font-size:.9375rem;
  transition:color .2s var(--ease), background .2s var(--ease), border-color .2s var(--ease);
}
.hdr-link::before{
  content:attr(data-index);
  font-family:var(--font-mono);
  font-size:.625rem;
  letter-spacing:.06em;
  font-weight:400;
  color:var(--glow-blue-deep);
}
.hdr-link:hover{
  color:var(--chalk);
  background:var(--turf-raise);
  border-color:var(--line-soft);
}
.hdr-link[aria-current="page"]{
  color:var(--ink-solid);
  background:linear-gradient(100deg, var(--glow-blue), #8EF1FF 48%, var(--glow-blue-deep));
  border-color:transparent;
}
.hdr-link[aria-current="page"]::before{color:rgba(11,31,25,.62)}

.hdr-actions{
  margin-left:auto;
  display:flex;
  align-items:center;
  gap:.55rem;
}
.hdr-cta{
  display:inline-flex;
  align-items:center;
  padding:.5rem 1.05rem;
  border-radius:var(--radius-pill);
  background:linear-gradient(115deg, var(--glow-blue), #9DF2FF 46%, var(--glow-blue-deep));
  color:var(--ink-solid);
  font-family:var(--font-display);
  font-weight:700;
  font-size:.9375rem;
  white-space:nowrap;
  box-shadow:0 0 0 1px rgba(79,227,255,.4), 0 10px 26px -14px rgba(79,227,255,.95);
  transition:transform .2s var(--ease), box-shadow .2s var(--ease);
}
.hdr-cta:hover{
  transform:translateY(-1px);
  box-shadow:0 0 0 1px rgba(79,227,255,.62), 0 14px 30px -14px rgba(79,227,255,1);
}

.hdr-toggle{
  display:none;
  align-items:center;
  gap:.5rem;
  padding:.45rem .8rem;
  border-radius:var(--radius-pill);
  border:1px solid var(--line-soft);
  background:var(--turf-panel);
  color:var(--chalk);
  transition:background .2s var(--ease), border-color .2s var(--ease);
}
.hdr-toggle-bars{
  display:grid;
  gap:4px;
  width:18px;
}
.hdr-toggle-bar{
  display:block;
  height:2px;
  border-radius:2px;
  background:var(--glow-blue);
  transition:transform .25s var(--ease), opacity .2s var(--ease);
}
.hdr-toggle-text{
  font-family:var(--font-mono);
  font-size:.75rem;
  letter-spacing:.08em;
  color:var(--chalk-dim);
}
.hdr-toggle[aria-expanded="true"]{
  background:var(--turf-raise);
  border-color:rgba(79,227,255,.5);
}
.hdr-toggle[aria-expanded="true"] .hdr-toggle-bar:nth-child(1){transform:translateY(6px) rotate(45deg)}
.hdr-toggle[aria-expanded="true"] .hdr-toggle-bar:nth-child(2){opacity:0}
.hdr-toggle[aria-expanded="true"] .hdr-toggle-bar:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

.hdr-progress{
  position:absolute;
  left:0;
  bottom:0;
  height:2px;
  width:0;
  background:linear-gradient(90deg, var(--glow-blue-deep), var(--glow-blue), var(--amber-flag));
  box-shadow:0 0 10px rgba(79,227,255,.8);
  transition:width .12s linear;
}

/* —— 页头响应式 —— */
@media (max-width:900px){
  .hdr-toggle{display:inline-flex}
  .hdr-cta{padding:.45rem .85rem;font-size:.875rem}
  .hdr-lower-inner{padding-block:.45rem .55rem}
  .hdr-nav{
    position:absolute;
    left:0;
    right:0;
    top:100%;
    max-height:0;
    overflow:hidden;
    opacity:0;
    visibility:hidden;
    background:linear-gradient(180deg, rgba(14,42,34,.99), rgba(7,19,15,.99));
    border-bottom:1px solid var(--line-soft);
    box-shadow:0 26px 44px -26px rgba(0,0,0,.95);
    transition:max-height .34s var(--ease), opacity .2s var(--ease), visibility .34s linear;
  }
  .hdr-nav[data-open="true"]{
    max-height:min(70vh, 34rem);
    overflow-y:auto;
    opacity:1;
    visibility:visible;
  }
  .hdr-nav-list{
    flex-direction:column;
    align-items:stretch;
    gap:.3rem;
    padding:.9rem var(--gutter) 1.3rem;
  }
  .hdr-link{
    justify-content:flex-start;
    padding:.8rem 1rem;
    border-radius:14px;
    border-color:rgba(31,74,60,.8);
    background:rgba(20,56,44,.45);
    font-size:1rem;
  }
  .hdr-link::before{font-size:.6875rem}
}

@media (max-width:640px){
  .hdr-utility{display:none}
  .hdr-status{margin-left:0}
}
@media (max-width:560px){
  .hdr-tagline{display:none}
}

/* ================= 7. 页脚 ================= */
.site-footer{
  position:relative;
  margin-top:clamp(3rem,8vw,6rem);
  border-top:1px solid var(--line-soft);
  background:linear-gradient(180deg, rgba(14,42,34,.62), rgba(7,19,15,1) 42%);
}
.site-footer::before{
  content:"";
  display:block;
  height:2px;
  background:linear-gradient(90deg, transparent, var(--glow-blue-deep), var(--glow-blue), var(--amber-flag), transparent);
  opacity:.6;
  transform:skewY(-.5deg);
}
.ftr-inner{padding-block:clamp(2.25rem,5vw,3.5rem) 1.25rem}

.ftr-top{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:2rem;
}
.ftr-brand{min-width:0}
.ftr-mark{
  display:block;
  width:1.5rem;
  height:1.5rem;
  border-radius:8px;
  background:linear-gradient(135deg, var(--glow-blue), var(--turf-raise));
  box-shadow:0 0 16px rgba(79,227,255,.5);
}
.ftr-brand-name{
  margin-top:.9rem;
  font-family:var(--font-display);
  font-weight:700;
  font-size:1.25rem;
  letter-spacing:-.01em;
  color:var(--chalk);
}
.ftr-tagline{
  margin-top:.35rem;
  font-family:var(--font-mono);
  font-size:var(--type-meta);
  letter-spacing:.06em;
  color:var(--chalk-dim);
}

.ftr-cols{
  display:grid;
  grid-template-columns:repeat(auto-fit, minmax(9rem, 1fr));
  gap:1.5rem 1.75rem;
}
.ftr-col-title{
  display:flex;
  align-items:baseline;
  gap:.5rem;
  font-family:var(--font-display);
  font-size:1rem;
  font-weight:700;
  letter-spacing:.02em;
  color:var(--chalk);
}
.ftr-col-index{
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.08em;
  color:var(--glow-blue-deep);
}
.ftr-list{
  margin-top:.85rem;
  display:grid;
  gap:.45rem;
}
.ftr-link{
  display:inline-block;
  color:var(--chalk-dim);
  font-size:.9375rem;
  border-bottom:1px solid transparent;
  transition:color .2s var(--ease), border-color .2s var(--ease);
}
.ftr-link:hover{
  color:var(--glow-blue);
  border-bottom-color:rgba(79,227,255,.55);
}

.ftr-contact{
  margin-top:2.5rem;
  padding-top:1.5rem;
  border-top:1px solid rgba(31,74,60,.7);
  display:grid;
  grid-template-columns:repeat(auto-fit, minmax(13rem, 1fr));
  gap:.85rem 2rem;
}
.ftr-contact-item{
  display:flex;
  flex-direction:column;
  gap:.15rem;
  min-width:0;
}
.ftr-contact-label{
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.12em;
  color:var(--glow-blue-deep);
}
.ftr-contact-value{
  color:var(--chalk);
  font-size:.9375rem;
  overflow-wrap:anywhere;
}
.ftr-note{
  grid-column:1 / -1;
  max-width:62ch;
  color:var(--chalk-dim);
  font-size:var(--type-meta);
  line-height:1.75;
}

.ftr-legal{
  margin-top:1.75rem;
  padding-top:1.1rem;
  border-top:1px solid rgba(31,74,60,.7);
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:.4rem 1.5rem;
  font-family:var(--font-mono);
  font-size:.75rem;
  letter-spacing:.06em;
  color:var(--chalk-dim);
}
.ftr-icp,
.ftr-signoff,
.ftr-year{white-space:nowrap}
.ftr-year{margin-left:auto}

@media (min-width:900px){
  .ftr-top{
    grid-template-columns:minmax(15rem,.9fr) 2.1fr;
    gap:3rem;
  }
}

/* ================= 8. 通用组件 ================= */
.section{padding-block:clamp(2.5rem,7vw,5rem)}
.section--tight{padding-block:clamp(1.5rem,4vw,2.5rem)}

.section-head{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  gap:.75rem 1.5rem;
  margin-bottom:clamp(1.25rem,3vw,2.25rem);
}
.section-head > p{max-width:56ch;color:var(--chalk-dim)}

.eyebrow{
  display:inline-block;
  font-family:var(--font-mono);
  font-size:var(--type-meta);
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--glow-blue);
}

.coord{
  display:inline-flex;
  align-items:center;
  gap:.35rem;
  padding:.2rem .55rem;
  border-radius:8px;
  border:1px solid rgba(79,227,255,.4);
  background:rgba(28,155,184,.14);
  color:var(--glow-blue);
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.08em;
}

.pill{
  display:inline-flex;
  align-items:center;
  gap:.4rem;
  padding:.25rem .7rem;
  border-radius:var(--radius-pill);
  border:1px solid var(--line-soft);
  background:rgba(20,56,44,.5);
  color:var(--chalk-dim);
  font-family:var(--font-mono);
  font-size:.75rem;
  letter-spacing:.06em;
}
.pill--amber{
  border-color:rgba(255,180,84,.55);
  background:rgba(255,180,84,.12);
  color:var(--amber-flag);
}

.rule{
  height:1px;
  border:0;
  background:linear-gradient(90deg, var(--line-soft), rgba(31,74,60,0) 88%);
}

.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.5rem;
  padding:.6rem 1.15rem;
  border-radius:var(--radius-pill);
  border:1px solid var(--line-soft);
  background:var(--turf-panel);
  color:var(--chalk);
  font-family:var(--font-display);
  font-weight:700;
  font-size:.9375rem;
  transition:color .2s var(--ease), background .2s var(--ease), border-color .2s var(--ease), transform .2s var(--ease);
}
.btn:hover{background:var(--turf-raise);border-color:rgba(79,227,255,.45);transform:translateY(-1px)}
.btn--primary{
  background:linear-gradient(115deg, var(--glow-blue), #9DF2FF 46%, var(--glow-blue-deep));
  border-color:transparent;
  color:var(--ink-solid);
  box-shadow:0 0 0 1px rgba(79,227,255,.35), 0 12px 28px -16px rgba(79,227,255,.95);
}
.btn--primary:hover{background:linear-gradient(115deg, #7BEBFF, #B4F6FF 46%, var(--glow-blue-deep))}
.btn--ghost{
  background:transparent;
  border-color:rgba(79,227,255,.45);
  color:var(--glow-blue);
}
.btn--ghost:hover{background:rgba(79,227,255,.10)}
.btn--amber{
  background:rgba(255,180,84,.10);
  border-color:rgba(255,180,84,.5);
  color:var(--amber-flag);
}
.btn--amber:hover{background:rgba(255,180,84,.18);border-color:var(--amber-flag)}

.card{
  position:relative;
  padding:1.25rem 1.35rem;
  border-radius:var(--radius-md);
  border:1px solid var(--line-soft);
  background:linear-gradient(160deg, var(--turf-panel), rgba(14,42,34,.55));
  overflow:hidden;
  transition:border-color .22s var(--ease), background .22s var(--ease), transform .22s var(--ease);
}
.card::after{
  content:"";
  position:absolute;
  inset:0;
  border-radius:inherit;
  pointer-events:none;
  background:linear-gradient(100deg, transparent 0 38%, rgba(79,227,255,.20) 50%, transparent 62%);
  opacity:0;
  transition:opacity .22s var(--ease);
}
.card:hover{
  border-color:rgba(79,227,255,.5);
  background:linear-gradient(160deg, var(--turf-raise), rgba(14,42,34,.72));
  transform:translateY(-2px);
}
.card:hover::after{opacity:1}
.card--raise{
  background:linear-gradient(160deg, var(--turf-raise), rgba(20,56,44,.55));
  border-color:rgba(79,227,255,.28);
}
.card-title{
  font-family:var(--font-display);
  font-size:1.0625rem;
  font-weight:700;
  letter-spacing:-.01em;
  color:var(--chalk);
}
.card-meta{
  margin-top:.35rem;
  font-family:var(--font-mono);
  font-size:.75rem;
  letter-spacing:.06em;
  color:var(--chalk-dim);
}

.panel{
  padding:clamp(1.15rem,2.5vw,1.75rem);
  border-radius:var(--radius-lg);
  border:1px solid var(--line-soft);
  background:linear-gradient(150deg, rgba(14,42,34,.9), rgba(7,19,15,.7));
}
.panel--mint{
  background:var(--paper-mint);
  border-color:transparent;
  color:var(--ink-solid);
}
.panel--mint .card-title,
.panel--mint h2,
.panel--mint h3{color:var(--ink-solid)}
.panel--mint .card-meta,
.panel--mint .pill{color:rgba(11,31,25,.62)}
.panel--mint a{color:#0C5E6E;border-bottom:1px solid rgba(12,94,110,.45)}

.crumbs{padding-block:.9rem}
.crumbs-list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.4rem;
  font-family:var(--font-mono);
  font-size:.75rem;
  letter-spacing:.06em;
  color:var(--chalk-dim);
}
.crumbs-item{display:inline-flex;align-items:center;gap:.4rem}
.crumbs-item + .crumbs-item::before{
  content:"/";
  color:var(--glow-blue-deep);
}
.crumbs-link{color:var(--chalk-dim);transition:color .2s var(--ease)}
.crumbs-link:hover{color:var(--glow-blue)}
.crumbs-item [aria-current="page"]{color:var(--chalk)}

.prose{
  max-width:66ch;
  color:var(--chalk);
  line-height:1.85;
}
.prose p + p{margin-top:1.1em}
.prose h2{margin-top:2.2em;margin-bottom:.6em}
.prose h3{margin-top:1.6em;margin-bottom:.5em}
.prose ul,
.prose ol{margin-top:.8em;padding-left:1.25em}
.prose ul{list-style:disc}
.prose ol{list-style:decimal}
.prose li + li{margin-top:.4em}
.prose a{color:var(--glow-blue);border-bottom:1px solid rgba(79,227,255,.4)}
.prose blockquote{
  margin-top:1.4em;
  padding-left:1.1rem;
  border-left:2px solid var(--glow-blue-deep);
  color:var(--chalk-dim);
}

.grid{display:grid;gap:clamp(1rem,2.5vw,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(0,1.55fr) minmax(0,1fr)}
@media (max-width:860px){
  .grid--2,
  .grid--3,
  .grid--split{grid-template-columns:minmax(0,1fr)}
}

/* 媒体容器：页面阶段放图占位 */
.media{
  position:relative;
  overflow:hidden;
  border-radius:var(--radius-lg);
  border:1px solid var(--line-soft);
  aspect-ratio:16 / 9;
  background:
    radial-gradient(120% 120% at 20% 0%, rgba(79,227,255,.16), transparent 62%),
    linear-gradient(150deg, var(--turf-panel), var(--bg-night-turf));
}
.media > img,
.media > svg{
  width:100%;
  height:100%;
  object-fit:cover;
}
.media::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  opacity:.55;
  mix-blend-mode:soft-light;
  background:repeating-linear-gradient(0deg, rgba(7,19,15,.9) 0 1px, transparent 1px 3px);
}
.media--wide{aspect-ratio:21 / 9}
.media--tall{aspect-ratio:3 / 4}
.media--square{aspect-ratio:1 / 1}
.media--bleed{
  width:100vw;
  margin-inline:calc(50% - 50vw);
  border-radius:0;
  border-inline:0;
}
.media--tilt{transform:skewY(var(--tilt-a))}
.media--tilt > *{transform:skewY(calc(var(--tilt-a) * -1))}
.media-caption{
  margin-top:.6rem;
  font-family:var(--font-mono);
  font-size:.75rem;
  letter-spacing:.05em;
  color:var(--chalk-dim);
}

/* 主题筛选（页面阶段挂 data-* 使用） */
.filter-bar{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.5rem;
}
.filter-btn{
  padding:.4rem .9rem;
  border-radius:var(--radius-pill);
  border:1px solid var(--line-soft);
  background:rgba(20,56,44,.4);
  color:var(--chalk-dim);
  font-family:var(--font-mono);
  font-size:var(--type-meta);
  letter-spacing:.06em;
  transition:color .2s var(--ease), background .2s var(--ease), border-color .2s var(--ease);
}
.filter-btn:hover{color:var(--chalk);border-color:rgba(79,227,255,.45)}
.filter-btn[aria-pressed="true"]{
  color:var(--ink-solid);
  background:linear-gradient(100deg, var(--glow-blue), var(--glow-blue-deep));
  border-color:transparent;
}
.is-filtered-out{display:none !important}

/* 显现动效协议 */
[data-reveal]{
  opacity:0;
  transform:translateY(12px);
  transition:opacity .5s var(--ease), transform .5s var(--ease);
}
[data-reveal].is-in{
  opacity:1;
  transform:none;
}

/* ================= 9. 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;
  }
  [data-reveal]{
    opacity:1;
    transform:none;
  }
  .card:hover{transform:none}
  .btn:hover{transform:none}
  .hdr-cta:hover{transform:none}
}