/* ==========================================================================
   星空体育 · 共享样式表 /assets/site.css
   母题：夜间球场仰望星空；深空蓝基底 + 星芒金 / 荧光青双强调
   ========================================================================== */

:root{
  --starfield-900:#060B1F;
  --nebula-800:#0E1633;
  --deep-violet:#2A1B4D;
  --panel-line:#24304F;
  --aurora-cyan:#35E6D2;
  --star-gold:#FFC24B;
  --orbit-blue:#4C7DFF;
  --alert-coral:#FF6B5E;
  --ink-white:#F2F6FF;
  --mist-gray:#A7B3CC;

  --font-heading:"HarmonyOS Sans SC","Source Han Sans SC","Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --font-body:"HarmonyOS Sans SC","Source Han Sans SC","Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono","Noto Sans Mono CJK SC","SFMono-Regular",ui-monospace,monospace;

  --shell:1240px;
  --ease:cubic-bezier(.22,.61,.36,1);
  --radius-pill:999px;
}

/* --------------------------------------------------------------------------
   Reset & 基础排版
   -------------------------------------------------------------------------- */
*,*::before,*::after{box-sizing:border-box}

html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:148px;
}

body{
  margin:0;
  background-color:var(--starfield-900);
  background-image:
    radial-gradient(1100px 640px at 84% -12%, rgba(42,27,77,.85), transparent 62%),
    radial-gradient(760px 520px at 2% 4%, rgba(76,125,255,.14), transparent 62%);
  background-repeat:no-repeat;
  color:var(--ink-white);
  font-family:var(--font-body);
  font-size:17px;
  font-weight:400;
  line-height:1.75;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}

body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:0;
  pointer-events:none;
  background-image:
    radial-gradient(1.5px 1.5px at 30px 40px, rgba(242,246,255,.42), transparent 100%),
    radial-gradient(1.2px 1.2px at 180px 120px, rgba(53,230,210,.45), transparent 100%),
    radial-gradient(1.6px 1.6px at 380px 90px, rgba(255,194,75,.38), transparent 100%),
    radial-gradient(1.1px 1.1px at 520px 260px, rgba(242,246,255,.32), transparent 100%),
    radial-gradient(1.3px 1.3px at 90px 380px, rgba(76,125,255,.45), transparent 100%),
    radial-gradient(1.4px 1.4px at 300px 470px, rgba(242,246,255,.28), transparent 100%),
    radial-gradient(1.2px 1.2px at 470px 560px, rgba(53,230,210,.34), transparent 100%),
    radial-gradient(1.5px 1.5px at 600px 430px, rgba(255,194,75,.28), transparent 100%);
  background-size:640px 640px;
  background-repeat:repeat;
  opacity:.95;
}

main,
.site-header,
.site-footer{position:relative;z-index:1}

h1,h2,h3,h4,h5{
  margin:0 0 .6em;
  font-family:var(--font-heading);
  font-weight:900;
  line-height:1.15;
  letter-spacing:-.012em;
}

p{margin:0 0 1em}

a{color:var(--aurora-cyan);text-decoration:none;transition:color .16s var(--ease),border-color .16s var(--ease)}

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

ul,ol{padding-left:1.2em}

button{font:inherit}

:focus-visible{
  outline:2px solid var(--aurora-cyan);
  outline-offset:3px;
  border-radius:6px;
}

/* --------------------------------------------------------------------------
   工具类
   -------------------------------------------------------------------------- */
.shell{
  width:min(var(--shell), calc(100% - clamp(32px, 7vw, 96px)));
  margin-inline:auto;
}

.shell--narrow{
  width:min(900px, calc(100% - clamp(32px, 7vw, 96px)));
  margin-inline:auto;
}

.mono{
  font-family:var(--font-mono);
  font-size:.94em;
  letter-spacing:.02em;
}

.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  margin:0 0 14px;
  font-family:var(--font-mono);
  font-size:13px;
  font-weight:500;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--aurora-cyan);
}

.eyebrow::before{
  content:"";
  width:26px;
  height:1px;
  background:linear-gradient(90deg,var(--star-gold),rgba(255,194,75,0));
}

.section-title{
  margin:0 0 .45em;
  font-size:clamp(26px, 4vw, 44px);
  font-weight:900;
}

.lede{
  max-width:46ch;
  margin:0;
  font-size:clamp(17px, 1.5vw, 20px);
  line-height:1.7;
  color:var(--mist-gray);
}

.rule{
  height:1px;
  margin:clamp(28px, 5vw, 56px) 0;
  border:0;
  background:linear-gradient(90deg,var(--panel-line),rgba(36,48,79,0));
}

.visually-hidden{
  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
   -------------------------------------------------------------------------- */
.skip-link{
  position:absolute;
  top:-120px;
  left:clamp(14px, 3vw, 32px);
  z-index:300;
  display:inline-block;
  padding:12px 22px;
  background:var(--star-gold);
  color:#08122B;
  font-family:var(--font-heading);
  font-weight:800;
  font-size:15px;
  border-radius:0 0 16px 16px;
  transition:top .16s var(--ease);
}

.skip-link:focus,
.skip-link:focus-visible{top:0}

/* --------------------------------------------------------------------------
   头部：悬浮胶囊浮岛
   -------------------------------------------------------------------------- */
.site-header{
  position:fixed;
  top:24px;
  left:0;
  right:0;
  z-index:100;
  padding-inline:clamp(14px, 3vw, 32px);
  pointer-events:none;
  transition:top .2s var(--ease);
}

.site-header[data-scrolled]{top:12px}

.scroll-progress{
  position:fixed;
  top:0;left:0;
  width:100%;
  height:2px;
  z-index:101;
  pointer-events:none;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg, var(--aurora-cyan), var(--orbit-blue) 55%, var(--star-gold));
  box-shadow:0 0 14px rgba(53,230,210,.55);
}

.header-island{
  position:relative;
  pointer-events:auto;
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  display:flex;
  align-items:center;
  gap:18px;
  padding:10px 12px 10px 18px;
  border:1px solid var(--panel-line);
  border-radius:var(--radius-pill);
  background:linear-gradient(120deg, rgba(14,22,51,.88), rgba(42,27,77,.72));
  -webkit-backdrop-filter:blur(14px) saturate(140%);
  backdrop-filter:blur(14px) saturate(140%);
  box-shadow:0 18px 46px -28px rgba(53,230,210,.6), inset 0 1px 0 rgba(242,246,255,.06);
  transition:padding .2s var(--ease), background .2s var(--ease), border-color .2s var(--ease), box-shadow .2s var(--ease);
}

.site-header[data-scrolled] .header-island{
  padding-top:6px;
  padding-bottom:6px;
  background:linear-gradient(120deg, rgba(6,11,31,.92), rgba(28,18,54,.86));
  border-color:rgba(53,230,210,.3);
  box-shadow:0 16px 40px -26px rgba(53,230,210,.7), inset 0 1px 0 rgba(242,246,255,.05);
}

/* 品牌 */
.brand{
  flex:0 0 auto;
  display:flex;
  align-items:center;
  gap:10px;
  color:var(--ink-white);
}

.brand-mark{
  position:relative;
  display:block;
  flex:0 0 auto;
  width:24px;
  height:24px;
}

.brand-mark i{
  position:absolute;
  inset:0;
  display:block;
  border-radius:50%;
  background:conic-gradient(from 210deg, var(--aurora-cyan), var(--star-gold), var(--orbit-blue), var(--deep-violet), var(--aurora-cyan));
}

.brand-mark i::after{
  content:"";
  position:absolute;
  inset:6px;
  border-radius:50%;
  background:var(--starfield-900);
}

.brand-copy{display:flex;flex-direction:column;gap:1px}

.brand-name{
  display:block;
  font-family:var(--font-heading);
  font-size:18px;
  font-weight:900;
  line-height:1.15;
  letter-spacing:.02em;
  color:var(--ink-white);
}

.brand-suffix{
  display:inline-block;
  margin-left:6px;
  padding:2px 5px;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:700;
  letter-spacing:.1em;
  line-height:1.3;
  color:#08122B;
  background:var(--star-gold);
  border-radius:5px;
  vertical-align:2px;
}

.brand-tagline{
  display:block;
  font-family:var(--font-mono);
  font-size:11px;
  line-height:1.4;
  letter-spacing:.08em;
  color:var(--mist-gray);
}

/* 导航 */
.nav{
  flex:1 1 auto;
  display:flex;
  justify-content:center;
  min-width:0;
}

.nav-list{
  display:flex;
  align-items:center;
  gap:2px;
  margin:0;
  padding:0;
  list-style:none;
}

.nav-item{position:relative}

.nav-item + .nav-item::before{
  content:"";
  position:absolute;
  left:-3px;
  top:50%;
  width:4px;
  height:4px;
  margin-top:-2px;
  border-radius:50%;
  background:var(--panel-line);
}

.nav-link{
  position:relative;
  display:inline-flex;
  align-items:center;
  gap:7px;
  padding:9px 14px;
  border-radius:var(--radius-pill);
  font-family:var(--font-heading);
  font-size:15px;
  font-weight:500;
  line-height:1.3;
  color:var(--mist-gray);
  white-space:nowrap;
  transition:color .16s var(--ease), background .16s var(--ease), box-shadow .16s var(--ease);
}

.nav-link:hover{
  color:var(--ink-white);
  background:rgba(53,230,210,.09);
  box-shadow:inset 0 0 0 1px rgba(53,230,210,.5);
}

.nav-link[aria-current="page"]{
  color:var(--star-gold);
  background:rgba(255,194,75,.1);
  box-shadow:inset 0 0 0 1px rgba(255,194,75,.42);
}

.nav-link[aria-current="page"]::before{
  content:"";
  width:5px;
  height:5px;
  border-radius:50%;
  background:var(--star-gold);
  box-shadow:0 0 9px var(--star-gold);
}

.nav-actions{display:none}

/* 头部操作区 */
.header-actions{
  flex:0 0 auto;
  display:flex;
  align-items:center;
  gap:8px;
}

/* 移动菜单按钮 */
.nav-toggle{
  display:none;
  align-items:center;
  gap:9px;
  margin-left:auto;
  padding:9px 14px;
  border:1px solid var(--panel-line);
  border-radius:var(--radius-pill);
  background:transparent;
  color:var(--ink-white);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.16em;
  cursor:pointer;
  transition:border-color .16s var(--ease), color .16s var(--ease);
}

.nav-toggle:hover,
.nav-toggle:focus-visible{border-color:var(--aurora-cyan);color:var(--aurora-cyan)}

.nav-toggle-text{line-height:1}

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

.nav-toggle-bars::before,
.nav-toggle-bars::after{
  content:"";
  position:absolute;
  left:0;
  width:16px;
  height:2px;
  background:currentColor;
  transition:transform .18s var(--ease);
}

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

.header-island[data-open] .nav-toggle-bars::before{transform:translateY(4px) rotate(45deg)}
.header-island[data-open] .nav-toggle-bars::after{transform:translateY(-4px) rotate(-45deg)}

/* --------------------------------------------------------------------------
   按钮
   -------------------------------------------------------------------------- */
.btn{
  position:relative;
  overflow:hidden;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:12px 22px;
  border:1px solid transparent;
  border-radius:var(--radius-pill);
  font-family:var(--font-heading);
  font-size:15px;
  font-weight:800;
  line-height:1.3;
  white-space:nowrap;
  cursor:pointer;
  transition:transform .16s var(--ease), box-shadow .16s var(--ease), background .16s var(--ease), color .16s var(--ease), border-color .16s var(--ease);
}

.btn::after{
  content:"";
  position:absolute;
  inset:0;
  border-radius:inherit;
  pointer-events:none;
  background:linear-gradient(100deg, transparent 28%, rgba(255,255,255,.3) 50%, transparent 72%);
  transform:translateX(-130%);
  opacity:0;
  transition:transform .16s var(--ease), opacity .16s var(--ease);
}

.btn:hover::after,
.btn:focus-visible::after{transform:translateX(130%);opacity:1}

.btn--sm{padding:9px 16px;font-size:14px}

.btn--gold{
  background:linear-gradient(120deg, var(--star-gold), #FFDD96);
  color:#08122B;
  box-shadow:0 12px 28px -16px rgba(255,194,75,.95);
}

.btn--gold:hover{transform:translateY(-2px);box-shadow:0 18px 34px -16px rgba(255,194,75,1)}

.btn--ghost{
  background:rgba(53,230,210,.06);
  border-color:rgba(53,230,210,.45);
  color:var(--ink-white);
}

.btn--ghost:hover{
  transform:translateY(-2px);
  border-color:var(--aurora-cyan);
  color:var(--aurora-cyan);
  box-shadow:0 0 0 3px rgba(53,230,210,.12);
}

.btn--cyan{
  background:linear-gradient(120deg, var(--aurora-cyan), #8DF6EA);
  color:#04121F;
  box-shadow:0 12px 28px -16px rgba(53,230,210,.95);
}

.btn--cyan:hover{transform:translateY(-2px)}

/* --------------------------------------------------------------------------
   页脚：档案式分层 + 斜向切割
   -------------------------------------------------------------------------- */
.site-footer{
  position:relative;
  margin-top:clamp(56px, 9vw, 120px);
  padding:clamp(44px, 6vw, 76px) 0 26px;
  border-top:1px solid var(--panel-line);
  background:
    linear-gradient(178deg, rgba(42,27,77,.6) 0%, rgba(14,22,51,.92) 44%, var(--starfield-900) 100%);
  overflow:hidden;
}

.site-footer::before{
  content:"";
  position:absolute;
  top:-1px;
  left:-6%;
  right:-6%;
  height:150px;
  pointer-events:none;
  background:linear-gradient(100deg, rgba(53,230,210,.09), rgba(76,125,255,.14) 46%, rgba(255,194,75,.06) 70%, transparent 88%);
  clip-path:polygon(0 0, 100% 0, 100% 26%, 0 100%);
}

.footer-grid-lines{
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:
    linear-gradient(rgba(36,48,79,.4) 1px, transparent 1px),
    linear-gradient(90deg, rgba(36,48,79,.4) 1px, transparent 1px);
  background-size:64px 64px;
  -webkit-mask-image:radial-gradient(120% 82% at 50% 0%, #000 0%, transparent 76%);
  mask-image:radial-gradient(120% 82% at 50% 0%, #000 0%, transparent 76%);
}

.footer-inner{
  position:relative;
  display:grid;
  grid-template-columns:1.6fr 1fr 1fr 1fr 1.5fr;
  gap:clamp(22px, 3vw, 44px);
  padding-bottom:clamp(30px, 4vw, 48px);
}

.footer-brand{display:flex;flex-direction:column;gap:14px}

.brand--footer{align-self:flex-start}
.brand--footer .brand-name{font-size:19px}

.footer-note{
  max-width:34ch;
  margin:0;
  font-size:14px;
  line-height:1.75;
  color:var(--mist-gray);
}

.footer-stamp{
  margin:0;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.2em;
  color:rgba(167,179,204,.6);
}

.footer-col{display:flex;flex-direction:column}

.footer-col-title{
  margin:0 0 16px;
  padding-bottom:10px;
  border-bottom:1px solid var(--panel-line);
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:500;
  letter-spacing:.2em;
  color:var(--mist-gray);
}

.footer-list{
  display:flex;
  flex-direction:column;
  gap:10px;
  margin:0;
  padding:0;
  list-style:none;
}

.footer-link{
  display:inline-flex;
  align-items:center;
  gap:0;
  font-size:15px;
  color:var(--ink-white);
  transition:color .16s var(--ease), gap .16s var(--ease);
}

.footer-link::before{
  content:"";
  width:0;
  height:1px;
  background:var(--aurora-cyan);
  transition:width .16s var(--ease);
}

.footer-link:hover,
.footer-link:focus-visible{color:var(--aurora-cyan);gap:8px}
.footer-link:hover::before,
.footer-link:focus-visible::before{width:14px}

.footer-contact{
  display:flex;
  flex-direction:column;
  gap:9px;
  padding-left:18px;
  border-left:1px solid var(--panel-line);
}

.contact-label{
  margin:0 0 4px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.2em;
  color:var(--star-gold);
}

.contact-line{
  margin:0;
  font-family:var(--font-mono);
  font-size:13px;
  line-height:1.7;
  letter-spacing:.01em;
  color:var(--mist-gray);
  word-break:break-word;
}

.contact-line--strong{color:var(--ink-white)}

.footer-legal{
  position:relative;
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px 26px;
  padding-top:22px;
  border-top:1px solid var(--panel-line);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.05em;
  color:var(--mist-gray);
}

.legal-line{
  display:inline-flex;
  align-items:center;
  gap:8px;
  margin:0;
}

.legal-key{color:var(--star-gold)}

/* --------------------------------------------------------------------------
   通用内容组件
   -------------------------------------------------------------------------- */
.crumbs{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  margin:0 0 22px;
  padding:0;
  list-style:none;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--mist-gray);
}

.crumbs li{display:inline-flex;align-items:center;gap:10px}

.crumbs li + li::before{
  content:"/";
  color:var(--panel-line);
}

.crumbs a{color:var(--mist-gray)}
.crumbs a:hover{color:var(--aurora-cyan)}
.crumbs [aria-current="page"]{color:var(--star-gold)}

.grid{
  display:grid;
  gap:clamp(16px, 2.4vw, 28px);
}

.grid--2{grid-template-columns:repeat(auto-fit, minmax(280px, 1fr))}
.grid--3{grid-template-columns:repeat(auto-fit, minmax(240px, 1fr))}
.grid--4{grid-template-columns:repeat(auto-fit, minmax(200px, 1fr))}

.panel{
  position:relative;
  padding:clamp(18px, 2.4vw, 28px);
  background:linear-gradient(155deg, rgba(42,27,77,.5), rgba(14,22,51,.92));
  border:1px solid var(--panel-line);
  transition:border-color .16s var(--ease), transform .16s var(--ease), box-shadow .16s var(--ease);
}

.panel:hover{
  border-color:rgba(53,230,210,.6);
  transform:translateY(-3px);
  box-shadow:0 26px 52px -34px rgba(53,230,210,.75);
}

.panel--cut{
  clip-path:polygon(0 0, calc(100% - 28px) 0, 100% 28px, 100% 100%, 28px 100%, 0 calc(100% - 28px));
}

.panel--edge::before{
  content:"";
  position:absolute;
  left:0;
  top:0;
  bottom:0;
  width:3px;
  background:linear-gradient(180deg, var(--aurora-cyan), rgba(53,230,210,0));
}

.data-card{
  position:relative;
  display:flex;
  flex-direction:column;
  gap:6px;
  padding:clamp(16px, 2vw, 22px);
  background:linear-gradient(160deg, rgba(14,22,51,.96), rgba(42,27,77,.42));
  border:1px solid var(--panel-line);
  border-top:2px solid rgba(255,194,75,.7);
  transition:border-color .16s var(--ease), transform .16s var(--ease);
}

.data-card:hover{
  transform:translateY(-3px);
  border-color:rgba(53,230,210,.55);
}

.metric{
  font-family:var(--font-mono);
  font-size:clamp(28px, 4vw, 44px);
  font-weight:700;
  line-height:1;
  letter-spacing:-.02em;
  color:var(--star-gold);
}

.metric-unit{
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.1em;
  color:var(--mist-gray);
}

.metric-label{
  margin:0;
  font-size:14px;
  line-height:1.65;
  color:var(--mist-gray);
}

.readout{
  display:flex;
  gap:16px;
  padding:16px 18px;
  background:linear-gradient(120deg, rgba(14,22,51,.88), rgba(6,11,31,.6));
  border:1px solid var(--panel-line);
  border-left:3px solid var(--aurora-cyan);
  transition:border-color .16s var(--ease), background .16s var(--ease);
}

.readout:hover{
  border-left-color:var(--star-gold);
  background:linear-gradient(120deg, rgba(42,27,77,.72), rgba(6,11,31,.6));
}

.readout-index{
  flex:0 0 auto;
  padding-top:2px;
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.1em;
  color:var(--star-gold);
}

.readout-body{margin:0;font-size:16px;line-height:1.7}

.readout-body p{
  max-width:46ch;
  margin:0 0 .6em;
}

.readout-body p:last-child{margin-bottom:0}

.archive-card{
  position:relative;
  display:block;
  padding:18px 20px 18px 22px;
  background:linear-gradient(150deg, rgba(14,22,51,.92), rgba(42,27,77,.35));
  border:1px solid var(--panel-line);
  clip-path:polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
  color:var(--ink-white);
  transition:border-color .16s var(--ease), color .16s var(--ease), transform .16s var(--ease);
}

.archive-card:hover{
  transform:translateY(-3px);
  border-color:var(--aurora-cyan);
  color:var(--aurora-cyan);
}

.archive-card-title{
  margin:0 0 6px;
  font-family:var(--font-heading);
  font-size:20px;
  font-weight:800;
  line-height:1.4;
  color:inherit;
}

.archive-card-meta{
  display:block;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--mist-gray);
}

.archive-card--star::before{
  content:"★";
  position:absolute;
  top:14px;
  right:16px;
  font-size:14px;
  line-height:1;
  color:var(--star-gold);
}

.archive-card--old::before{
  content:attr(data-stamp);
  position:absolute;
  top:12px;
  right:14px;
  padding:1px 7px;
  border:1px solid rgba(255,107,94,.5);
  border-radius:var(--radius-pill);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.06em;
  color:var(--alert-coral);
}

.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 10px;
  border:1px solid var(--panel-line);
  border-radius:var(--radius-pill);
  font-family:var(--font-mono);
  font-size:12px;
  line-height:1.4;
  letter-spacing:.1em;
  color:var(--mist-gray);
}

.tag--gold{
  border-color:rgba(255,194,75,.5);
  background:rgba(255,194,75,.08);
  color:var(--star-gold);
}

.tag--cyan{
  border-color:rgba(53,230,210,.5);
  background:rgba(53,230,210,.08);
  color:var(--aurora-cyan);
}

.tag--alert{
  border-color:rgba(255,107,94,.5);
  background:rgba(255,107,94,.08);
  color:var(--alert-coral);
}

.prose{
  font-size:17px;
  line-height:1.75;
  color:var(--ink-white);
}

.prose p{
  max-width:46ch;
  margin:0 0 1.15em;
}

.prose h2{
  margin:1.7em 0 .6em;
  font-size:clamp(24px, 3vw, 34px);
}

.prose h3{
  margin:1.5em 0 .5em;
  font-size:clamp(19px, 2vw, 24px);
  font-weight:800;
}

.prose ul,.prose ol{max-width:46ch;margin:0 0 1.15em}
.prose li{margin-bottom:.5em}

.prose a{
  border-bottom:1px solid rgba(53,230,210,.5);
  padding-bottom:1px;
}

.prose a:hover{
  border-bottom-color:var(--star-gold);
  color:var(--star-gold);
}

/* 图片容器基础规则：页面阶段在内部放 img 并提供中文 alt */
.media-frame{
  position:relative;
  display:block;
  width:100%;
  aspect-ratio:16 / 9;
  overflow:hidden;
  border:1px solid var(--panel-line);
  background:
    repeating-linear-gradient(115deg, transparent 0 28px, rgba(36,48,79,.55) 28px 29px),
    radial-gradient(620px 340px at 78% 8%, rgba(42,27,77,.95), transparent 66%),
    linear-gradient(160deg, var(--deep-violet), var(--nebula-800));
}

.media-frame img,
.media-frame svg,
.media-frame video{
  display:block;
  width:100%;
  height:100%;
  object-fit:cover;
}

.media-frame--wide{aspect-ratio:21 / 9}
.media-frame--square{aspect-ratio:1 / 1}
.media-frame--portrait{aspect-ratio:3 / 4}

/* --------------------------------------------------------------------------
   进入视口淡入
   -------------------------------------------------------------------------- */
html.js-ready [data-reveal]{
  opacity:0;
  transform:translateY(10px);
  transition:opacity .16s var(--ease), transform .16s var(--ease);
}

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

/* --------------------------------------------------------------------------
   断点
   -------------------------------------------------------------------------- */
@media (max-width:1120px){
  .footer-inner{grid-template-columns:1.5fr 1fr 1fr 1.4fr}
  .footer-contact{grid-column:1 / -1;border-left:0;border-top:1px solid var(--panel-line);padding-left:0;padding-top:18px}
}

@media (max-width:1080px){
  .brand-tagline{display:none}
}

@media (max-width:900px){
  .site-header{top:14px}
  .site-header[data-scrolled]{top:8px}

  .header-island{
    gap:10px;
    padding:9px 10px 9px 14px;
    border-radius:22px;
  }

  .header-actions{display:none}

  .nav-toggle{
    display:inline-flex;
    order:3;
  }

  .nav{
    order:4;
    position:absolute;
    top:calc(100% + 12px);
    left:0;
    right:0;
    display:none;
    flex-direction:column;
    padding:14px;
    border:1px solid var(--panel-line);
    border-radius:24px;
    background:linear-gradient(150deg, rgba(14,22,51,.98), rgba(42,27,77,.95));
    -webkit-backdrop-filter:blur(16px);
    backdrop-filter:blur(16px);
    box-shadow:0 32px 64px -34px rgba(0,0,0,.95);
  }

  .header-island[data-open] .nav{display:flex}

  .nav-list{
    flex-direction:column;
    align-items:stretch;
    gap:4px;
    width:100%;
  }

  .nav-item + .nav-item::before{display:none}

  .nav-link{
    width:100%;
    padding:12px 14px;
    border-radius:14px;
    font-size:16px;
  }

  .nav-actions{
    display:flex;
    flex-direction:column;
    gap:8px;
    margin-top:12px;
    padding-top:14px;
    border-top:1px solid var(--panel-line);
  }

  .nav-actions .btn{width:100%}

  .footer-inner{grid-template-columns:repeat(2, minmax(0,1fr));gap:26px 22px}
  .footer-brand{grid-column:1 / -1}
  .footer-contact{grid-column:1 / -1}
}

@media (max-width:620px){
  body{font-size:16px}

  .footer-inner{grid-template-columns:1fr}
  .footer-brand,
  .footer-contact{grid-column:auto}

  .footer-legal{flex-direction:column;align-items:flex-start;gap:8px}

  .padlock{display:block}

  .media-frame{aspect-ratio:4 / 3}
}

/* --------------------------------------------------------------------------
   无障碍：减少动效
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}

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

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

  .btn:hover,
  .panel:hover,
  .data-card:hover,
  .archive-card:hover{transform:none}
}