:root{
  --ink:#0A1A2A;
  --panel:#12304A;
  --plate:#2C3B49;
  --mist:#9AAAB8;
  --white:#E9EFF5;
  --gold:#F0A03C;
  --gold-deep:#C97A12;
  --teal:#2FB6A8;
  --coral:#E2566A;
  --glow:#FFD79A;
  --line:rgba(154,170,184,.16);
  --line-strong:rgba(154,170,184,.34);
  --rail-w:264px;
  --bar-h:64px;
  --wrap:1180px;
  --r-lg:26px;
  --r-md:16px;
  --r-sm:10px;
  --font-head:system-ui,"PingFang SC","Noto Sans SC",sans-serif;
  --font-num:"SF Mono","JetBrains Mono",ui-monospace,Consolas,monospace;
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;background:var(--ink)}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd,fieldset,legend{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
:focus-visible{outline:2px solid var(--gold);outline-offset:3px;border-radius:6px}
::selection{background:rgba(240,160,60,.3);color:var(--white)}

body{
  min-height:100vh;
  padding-top:var(--bar-h);
  overflow-x:hidden;
  background-color:var(--ink);
  background-image:
    radial-gradient(1200px 620px at 8% -12%,rgba(18,48,74,.95),rgba(10,26,42,0) 72%),
    repeating-linear-gradient(0deg,rgba(154,170,184,.045) 0 1px,transparent 1px 68px),
    repeating-linear-gradient(90deg,rgba(154,170,184,.045) 0 1px,transparent 1px 68px);
  color:var(--mist);
  font-family:var(--font-head);
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
}

h1,h2,h3,h4,h5{color:var(--white);font-weight:600;line-height:1.18;letter-spacing:-.01em}
h1{font-size:clamp(2.3rem,6.4vw,4.4rem);letter-spacing:-.035em;line-height:1.06}
h2{font-size:clamp(1.5rem,3.4vw,2.2rem)}
h3{font-size:clamp(1.08rem,2.1vw,1.34rem)}
p{max-width:78ch}

.num{font-family:var(--font-num);font-variant-numeric:tabular-nums;letter-spacing:-.02em}
.mark-gold{color:var(--white);border-bottom:2px solid var(--gold);padding-bottom:1px;box-shadow:inset 0 -.3em 0 rgba(240,160,60,.16)}

/* ---------- 结构工具 ---------- */
.wrap{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:20px}
.section{padding-block:clamp(44px,6vw,84px)}
.section--tight{padding-block:clamp(26px,4vw,48px)}
.stack{display:grid;gap:18px}
.grid{display:grid;gap:20px}
.grid--2,.grid--3,.grid--split{grid-template-columns:minmax(0,1fr)}
@media (min-width:768px){
  .wrap{padding-inline:32px}
  .grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid--split{grid-template-columns:minmax(0,240px) minmax(0,1fr);gap:32px}
}
@media (min-width:1120px){
  .grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
  .grid--split{grid-template-columns:minmax(0,280px) minmax(0,1fr)}
}

/* ---------- 标题区与面包屑 ---------- */
.page-head{padding-block:clamp(38px,6vw,74px) clamp(22px,3vw,40px);border-bottom:1px solid var(--line)}
.eyebrow{display:inline-flex;align-items:center;gap:10px;font-family:var(--font-num);font-size:11.5px;letter-spacing:.26em;text-transform:uppercase;color:var(--gold)}
.eyebrow::before{content:"";width:26px;height:1px;background:var(--gold);opacity:.85}
.lede{max-width:64ch;font-size:clamp(1rem,1.5vw,1.1rem);line-height:1.85;color:var(--white);opacity:.88}
.crumbs{display:flex;flex-wrap:wrap;align-items:center;font-size:13px;color:rgba(154,170,184,.85)}
.crumbs li{display:flex;align-items:center}
.crumbs li+li::before{content:"／";margin:0 10px;color:rgba(154,170,184,.35)}
.crumbs a{color:var(--mist);border-bottom:1px solid transparent;transition:color .2s ease,border-color .2s ease}
.crumbs a:hover{color:var(--gold);border-bottom-color:rgba(240,160,60,.6)}

/* ---------- 按钮 ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:10px 18px;border-radius:999px;border:1px solid transparent;font-size:13.5px;font-weight:600;letter-spacing:.04em;text-align:center;transition:background-color .2s ease,color .2s ease,border-color .2s ease}
.btn-gold{background:var(--gold);border-color:var(--gold);color:#1C1206}
.btn-gold:hover{background:var(--glow);border-color:var(--glow)}
.btn-ghost{background:rgba(18,48,74,.5);border-color:var(--line-strong);color:var(--white)}
.btn-ghost:hover{border-color:var(--gold);color:var(--gold)}

/* ---------- 跳过链接 ---------- */
.skip-link{position:fixed;left:16px;top:-120px;z-index:130;padding:10px 18px;border-radius:0 0 14px 14px;background:var(--gold);color:#1C1206;font-size:14px;font-weight:600;transition:top .22s ease}
.skip-link:focus{top:0}

/* ---------- 侧边轨道 / 顶部条 ---------- */
.site-rail{
  position:fixed;
  inset:0 0 auto 0;
  z-index:70;
  height:var(--bar-h);
  background:linear-gradient(180deg,rgba(18,48,74,.97),rgba(10,26,42,.97));
  border-bottom:1px solid var(--line);
}
.rail-inner{position:relative;display:flex;align-items:center;justify-content:space-between;gap:14px;height:100%;padding:0 16px}

.rail-brand{min-width:0}
.brand-mark{display:inline-flex;align-items:center;gap:12px}
.brand-glyph{flex:0 0 auto;display:grid;place-items:center;width:36px;height:36px;border-radius:12px;background:linear-gradient(140deg,var(--gold),var(--gold-deep));color:#1C1206;font-size:18px;font-weight:700;line-height:1;box-shadow:0 0 0 1px rgba(255,215,154,.32),0 10px 24px -14px rgba(240,160,60,.95)}
.brand-text{display:flex;flex-direction:column;min-width:0;line-height:1.25}
.brand-name{color:var(--white);font-size:16px;font-weight:600;letter-spacing:.02em}
.brand-sub{font-family:var(--font-num);font-size:10px;letter-spacing:.12em;color:var(--mist);text-transform:uppercase}
@media (max-width:540px){.brand-sub{display:none}}

.nav-toggle{display:inline-flex;align-items:center;gap:10px;padding:9px 15px;border-radius:999px;border:1px solid var(--line-strong);color:var(--white);font-size:13px;font-weight:600;letter-spacing:.08em;transition:border-color .2s ease,color .2s ease,background-color .2s ease}
.nav-toggle:hover{border-color:var(--gold);color:var(--gold)}
.nav-toggle-bars{display:grid;gap:4px;width:16px}
.nav-toggle-bar{display:block;height:2px;width:16px;border-radius:2px;background:currentColor;transition:width .2s ease}
.nav-toggle-bar:last-child{width:10px}
.site-rail[data-open] .nav-toggle-bar:last-child{width:16px}
.site-rail[data-open] .nav-toggle{border-color:var(--gold);color:var(--gold);background:rgba(240,160,60,.1)}

/* 抽屉导航（移动优先） */
.site-nav{
  position:fixed;
  top:var(--bar-h);
  left:0;
  z-index:80;
  display:flex;
  flex-direction:column;
  gap:18px;
  width:min(320px,88vw);
  height:calc(100dvh - var(--bar-h));
  padding:18px 18px 26px;
  overflow-y:auto;
  background:linear-gradient(200deg,#12304A,#0A1A2A 72%);
  border-right:1px solid var(--line);
  transform:translateX(-102%);
  visibility:hidden;
  transition:transform .34s cubic-bezier(.22,.72,.24,1),visibility .34s ease;
}
.site-rail[data-open] .site-nav{transform:none;visibility:visible}

.nav-caption{font-family:var(--font-num);font-size:10.5px;letter-spacing:.24em;text-transform:uppercase;color:rgba(154,170,184,.7)}
.nav-list{display:flex;flex-direction:column;gap:4px}
.nav-item{position:relative}
.nav-link{
  position:relative;
  display:flex;
  align-items:center;
  gap:12px;
  padding:11px 14px 11px 20px;
  border:1px solid transparent;
  border-radius:14px;
  color:var(--mist);
  font-size:14.5px;
  letter-spacing:.02em;
  transition:color .2s ease,background-color .2s ease,border-color .2s ease;
}
.nav-link::before{content:"";position:absolute;left:7px;top:50%;width:3px;height:0;border-radius:3px;background:var(--gold);transform:translateY(-50%);transition:height .22s ease}
.nav-link:hover{color:var(--white);background:rgba(44,59,73,.45)}
.nav-link:hover::before{height:16px}
.nav-link[aria-current="page"]{color:var(--white);background:linear-gradient(90deg,rgba(240,160,60,.2),rgba(240,160,60,0) 80%);border-color:rgba(240,160,60,.34)}
.nav-link[aria-current="page"]::before{height:22px}
.nav-index{font-family:var(--font-num);font-size:11px;color:rgba(154,170,184,.75)}
.nav-link[aria-current="page"] .nav-index{color:var(--gold)}
.nav-label{flex:1}

.rail-foot{margin-top:auto;display:flex;flex-direction:column;gap:12px;padding-top:16px;border-top:1px solid var(--line)}
.rail-status{display:inline-flex;align-items:center;gap:8px;font-family:var(--font-num);font-size:11.5px;letter-spacing:.12em;color:var(--teal);text-transform:uppercase}
.dot{flex:0 0 auto;width:6px;height:6px;border-radius:50%;background:currentColor;box-shadow:0 0 0 3px rgba(47,182,168,.18)}
.rail-actions{display:flex;flex-direction:column;gap:8px}
.rail-note{font-size:12px;line-height:1.7;color:rgba(154,170,184,.82)}

.rail-scrim{position:fixed;left:0;right:0;top:var(--bar-h);bottom:0;z-index:75;padding:0;border:0;background:rgba(6,16,26,.7);opacity:0;visibility:hidden;transition:opacity .3s ease,visibility .3s ease}
.site-rail[data-open] .rail-scrim{opacity:1;visibility:visible}

/* 桌面：竖向轨道 */
@media (min-width:1024px){
  body{padding-top:0;padding-left:var(--rail-w)}
  .site-rail{inset:0 auto 0 0;height:auto;width:var(--rail-w);border-right:1px solid var(--line);border-bottom:0;background:linear-gradient(160deg,#12304A 0%,#0A1A2A 64%)}
  .site-rail::before{content:"";position:absolute;left:0;top:0;bottom:0;width:5px;opacity:.65;pointer-events:none;background-image:repeating-linear-gradient(180deg,rgba(154,170,184,.3) 0 1px,transparent 1px 20px)}
  .site-rail::after{content:"";position:absolute;top:0;bottom:0;right:0;width:1px;pointer-events:none;background:linear-gradient(180deg,transparent,rgba(240,160,60,.5) 28%,rgba(240,160,60,.12) 72%,transparent)}
  .rail-inner{flex-direction:column;align-items:stretch;justify-content:flex-start;gap:22px;height:100%;padding:26px 18px 22px;overflow-y:auto}
  .nav-toggle{display:none}
  .rail-scrim{display:none}
  .site-nav{position:static;transform:none;visibility:visible;width:auto;height:auto;padding:0;overflow:visible;background:none;border:0;flex:1 1 auto;min-height:0;transition:none}
  .brand-sub{letter-spacing:.14em}
}

/* ---------- 页脚 ---------- */
.site-foot{position:relative;overflow:hidden;margin-top:clamp(64px,8vw,110px);border-top:1px solid var(--line);background:linear-gradient(180deg,#0A1A2A,#071320 68%,#050E17)}
.foot-cut{position:absolute;top:0;left:-5%;width:110%;height:2px;transform:rotate(-.7deg);transform-origin:left center;background:linear-gradient(90deg,rgba(240,160,60,0),var(--gold) 22%,rgba(47,182,168,.8) 62%,rgba(240,160,60,0));pointer-events:none}
.foot-inner{position:relative;z-index:2;padding-block:clamp(44px,6vw,72px) 28px}
.foot-lead{display:grid;gap:34px}
@media (min-width:900px){.foot-lead{grid-template-columns:minmax(0,1fr) minmax(0,1.45fr);gap:52px}}
.foot-brandline{color:var(--white);font-size:17px;font-weight:600;letter-spacing:.01em}
.foot-summary{margin-top:12px;max-width:46ch;font-size:14px;line-height:1.8;color:var(--mist)}
.foot-status{margin-top:16px;display:inline-flex;align-items:center;gap:8px;font-family:var(--font-num);font-size:11.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--teal)}
.foot-grid{display:grid;gap:28px;grid-template-columns:repeat(auto-fit,minmax(132px,1fr))}
.foot-col-title{padding-bottom:10px;margin-bottom:12px;border-bottom:1px solid var(--line);font-family:var(--font-num);font-size:11px;font-weight:600;letter-spacing:.2em;text-transform:uppercase;color:rgba(154,170,184,.8)}
.foot-links{display:grid;gap:8px}
.foot-link{display:inline-block;font-size:14px;line-height:1.6;color:var(--mist);border-bottom:1px solid transparent;transition:color .2s ease,border-color .2s ease}
.foot-link:hover{color:var(--gold);border-bottom-color:rgba(240,160,60,.6)}
.foot-meta{display:grid;gap:26px;margin-top:40px;padding-top:24px;border-top:1px solid var(--line)}
@media (min-width:900px){.foot-meta{grid-template-columns:minmax(0,1.6fr) minmax(0,1fr);align-items:start}}
.foot-contact{display:flex;flex-wrap:wrap;gap:10px 24px}
.foot-contact-item{display:inline-flex;align-items:center;gap:8px;font-size:13.5px;color:var(--white)}
.foot-key{font-family:var(--font-num);font-size:10.5px;letter-spacing:.1em;color:var(--gold);border:1px solid rgba(240,160,60,.4);border-radius:999px;padding:2px 9px}
.foot-note{width:100%;font-size:12.5px;line-height:1.7;color:rgba(154,170,184,.82)}
.foot-legal{display:flex;flex-direction:column;gap:10px}
.foot-legal-links{display:flex;flex-wrap:wrap;gap:8px 18px}
.foot-copy{font-family:var(--font-num);font-size:12px;letter-spacing:.05em;color:rgba(154,170,184,.78)}
.foot-mark{position:absolute;right:-12px;bottom:-28px;z-index:1;font-size:clamp(3.2rem,11vw,7.4rem);font-weight:700;line-height:1;letter-spacing:-.05em;color:rgba(233,239,245,.035);pointer-events:none;user-select:none}

/* ---------- 通用组件 ---------- */
.card{position:relative;padding:clamp(18px,2.4vw,26px);border:1px solid var(--line);border-radius:var(--r-lg);background:linear-gradient(158deg,rgba(18,48,74,.9),rgba(10,26,42,.92));transition:border-color .22s ease,transform .22s ease}
.card:hover{border-color:rgba(240,160,60,.5);transform:translateY(-2px)}
.card-title{margin-bottom:8px;color:var(--white);font-size:1.06rem;font-weight:600}

.note{padding:12px 16px 12px 18px;border-left:3px solid var(--gold);border-radius:0 var(--r-sm) var(--r-sm) 0;background:linear-gradient(90deg,rgba(240,160,60,.1),rgba(240,160,60,0));font-size:13.5px;line-height:1.75}

.stat{display:flex;flex-direction:column;gap:4px;padding:16px 18px;border:1px solid var(--line);border-radius:var(--r-md);background:rgba(18,48,74,.55)}
.stat-label{font-family:var(--font-num);font-size:10.5px;letter-spacing:.16em;text-transform:uppercase;color:rgba(154,170,184,.85)}
.stat-value{font-family:var(--font-num);font-variant-numeric:tabular-nums;font-size:clamp(1.7rem,3.6vw,2.6rem);line-height:1.1;color:var(--white)}
.stat-value--up{color:var(--teal)}
.stat-value--down{color:var(--coral)}
.stat-note{font-size:12.5px;color:rgba(154,170,184,.82)}

.table-scroll{overflow-x:auto;border:1px solid var(--line);border-radius:var(--r-md);background:rgba(10,26,42,.6)}
.data-table{width:100%;min-width:560px;border-collapse:collapse;font-size:14px}
.data-table caption{padding:14px 16px;text-align:left;font-size:12.5px;letter-spacing:.06em;color:var(--mist);border-bottom:1px solid var(--line)}
.data-table th{padding:12px 16px;background:var(--plate);color:var(--white);font-size:12.5px;font-weight:600;letter-spacing:.08em;text-align:left;white-space:nowrap}
.data-table td{padding:12px 16px;border-top:1px solid var(--line);color:var(--mist);vertical-align:top}
.data-table td .num{color:var(--white)}
.data-table tbody tr{transition:background-color .18s ease}
.data-table tbody tr:hover{background:rgba(44,59,73,.55)}
.data-table tbody tr:hover td{color:var(--white)}

.timeline{display:grid;gap:22px;padding-left:22px;border-left:1px solid var(--line-strong)}
.timeline li{position:relative}
.timeline li::before{content:"";position:absolute;left:-28px;top:6px;width:11px;height:11px;border-radius:50%;background:var(--gold);box-shadow:0 0 0 4px rgba(240,160,60,.14)}
.t-round{font-family:var(--font-num);font-size:12px;letter-spacing:.12em;color:var(--gold)}
.t-body{margin-top:4px;font-size:14px}

.chip{display:inline-flex;align-items:center;gap:6px;padding:4px 12px;border:1px solid var(--line-strong);border-radius:999px;font-size:12.5px;line-height:1.6;color:var(--mist);white-space:nowrap}
.chip--gold{border-color:rgba(240,160,60,.5);background:rgba(240,160,60,.08);color:var(--gold)}
.chip--teal{border-color:rgba(47,182,168,.5);background:rgba(47,182,168,.08);color:var(--teal)}
.chip--coral{border-color:rgba(226,86,106,.5);background:rgba(226,86,106,.08);color:var(--coral)}

.path{display:grid;gap:14px}
.path-step{position:relative;padding:18px 20px 18px 58px;border:1px solid var(--line);border-radius:var(--r-md);background:linear-gradient(120deg,rgba(18,48,74,.72),rgba(10,26,42,.6));transition:border-color .22s ease}
.path-step:hover{border-color:rgba(240,160,60,.45)}
.path-step::before{content:attr(data-step);position:absolute;left:16px;top:18px;display:grid;place-items:center;width:26px;height:26px;border-radius:50%;background:var(--gold);color:#1C1206;font-family:var(--font-num);font-size:12px;font-weight:700}
.path-step::after{content:"";position:absolute;left:28px;top:46px;bottom:-15px;width:1px;background:linear-gradient(180deg,rgba(240,160,60,.5),rgba(240,160,60,0))}
.path-step:last-child::after{display:none}
.path-title{color:var(--white);font-size:15px;font-weight:600}
.path-body{margin-top:4px;font-size:13.5px}

.range-band{position:relative;height:30px;overflow:hidden;border:1px solid var(--line);border-radius:999px;background:rgba(44,59,73,.55)}
.range-fill{position:absolute;top:0;bottom:0;border-radius:999px;background:linear-gradient(90deg,rgba(240,160,60,.85),rgba(240,160,60,.3))}
.range-fill--teal{background:linear-gradient(90deg,rgba(47,182,168,.85),rgba(47,182,168,.3))}
.range-fill--coral{background:linear-gradient(90deg,rgba(226,86,106,.85),rgba(226,86,106,.3))}
.range-band:hover .range-fill{filter:saturate(1.35) brightness(1.06)}

.scorebar{display:flex;align-items:center;gap:14px}
.scorebar-track{position:relative;flex:1;height:8px;overflow:hidden;border-radius:999px;background:rgba(44,59,73,.7)}
.scorebar-fill{position:absolute;inset:0 auto 0 0;border-radius:999px;background:linear-gradient(90deg,var(--gold-deep),var(--gold))}
.scorebar-value{font-family:var(--font-num);font-size:13px;color:var(--white)}

.dim{border:1px solid var(--line);border-radius:var(--r-md);background:rgba(18,48,74,.5);transition:border-color .22s ease}
.dim:hover{border-color:rgba(240,160,60,.4)}
.dim>summary{display:flex;align-items:center;justify-content:space-between;gap:14px;padding:14px 18px;cursor:pointer;color:var(--white);font-size:15px;font-weight:600}
.dim>summary::-webkit-details-marker{display:none}
.dim>summary::after{content:"＋";font-family:var(--font-num);font-size:14px;color:var(--gold)}
.dim[open]>summary::after{content:"－"}
.dim-body{padding:0 18px 18px;border-top:1px solid var(--line);font-size:14px}
.dim[open] .dim-body{animation:dimIn .26s ease both}
@keyframes dimIn{from{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:none}}

.filter{display:flex;flex-wrap:wrap;gap:10px;padding:0;border:0}
.filter-legend{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap}
.filter input{position:absolute;width:1px;height:1px;opacity:0}
.filter label{display:inline-flex;align-items:center;padding:7px 16px;border:1px solid var(--line-strong);border-radius:999px;font-size:13px;color:var(--mist);cursor:pointer;transition:background-color .2s ease,color .2s ease,border-color .2s ease}
.filter label:hover{border-color:var(--gold);color:var(--gold)}
.filter input:checked+label{background:var(--gold);border-color:var(--gold);color:#1C1206;font-weight:600}
.filter input:focus-visible+label{outline:2px solid var(--glow);outline-offset:2px}

/* 图片容器基础规则：页面阶段放置图片或 .media-slot 占位 */
.media-frame{position:relative;overflow:hidden;border:1px solid var(--line);border-radius:var(--r-lg);background:linear-gradient(150deg,#12304A,#0A1A2A)}
.media-frame img{width:100%;height:100%;object-fit:cover}
.media-frame::after{content:"";position:absolute;inset:0;pointer-events:none;background:linear-gradient(180deg,rgba(10,26,42,0) 44%,rgba(10,26,42,.78))}
.media-frame--wide{aspect-ratio:16/9}
.media-frame--tall{aspect-ratio:3/4}
.media-frame--portrait{aspect-ratio:4/5}
.media-frame--square{aspect-ratio:1/1}
.media-frame--band{aspect-ratio:21/9}
.media-slot{display:grid;place-items:center;width:100%;height:100%;min-height:120px;font-family:var(--font-num);font-size:11px;letter-spacing:.24em;text-transform:uppercase;color:rgba(154,170,184,.55);background-image:repeating-linear-gradient(45deg,rgba(154,170,184,.07) 0 6px,transparent 6px 14px)}
.media-caption{margin-top:10px;font-size:12.5px;line-height:1.7;color:rgba(154,170,184,.85)}

.band{position:relative;padding-block:clamp(26px,4vw,44px);border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:linear-gradient(100deg,rgba(18,48,74,.85),rgba(10,26,42,.5))}
.cut{position:relative;height:clamp(34px,5vw,64px)}
.cut::before{content:"";position:absolute;left:-5%;right:-5%;top:50%;height:1px;background:var(--line-strong);transform:rotate(-1.4deg)}
.cut::after{content:"";position:absolute;left:-5%;top:50%;width:38%;height:2px;background:linear-gradient(90deg,var(--gold),rgba(240,160,60,0));transform:rotate(-1.4deg)}

/* ---------- 脚本生成元素 ---------- */
.scroll-progress{position:fixed;top:0;left:0;right:0;z-index:90;height:3px;transform:scaleX(0);transform-origin:left center;background:linear-gradient(90deg,var(--gold-deep),var(--gold) 55%,var(--glow));pointer-events:none;transition:transform .1s linear}
@media (min-width:1024px){.scroll-progress{left:var(--rail-w)}}
.to-top{position:fixed;right:18px;bottom:22px;z-index:85;display:inline-flex;align-items:center;gap:8px;padding:10px 16px;border:1px solid rgba(240,160,60,.55);border-radius:999px;background:rgba(10,26,42,.92);color:var(--gold);font-size:12.5px;letter-spacing:.08em;opacity:0;visibility:hidden;transform:translateY(8px);transition:opacity .26s ease,transform .26s ease,visibility .26s ease}
.to-top.is-visible{opacity:1;visibility:visible;transform:none}
.to-top:hover{background:var(--gold);color:#1C1206}

/* ---------- 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}
  .card:hover{transform:none}
  .scroll-progress{transition:none}
}