/* ===== 1. Reset ===== */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:130px}
body{margin:0}
img,svg,video{max-width:100%;height:auto;display:block}
ul,ol{margin:0;padding:0;list-style:none}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
h1,h2,h3,h4,h5,p,figure,blockquote{margin:0}
address{font-style:normal}
table{border-collapse:collapse}
main{display:block}

/* ===== 2. 变量 ===== */
:root{
  --royal-deep:#123A6B;
  --royal-mid:#1E4E8C;
  --gold:#C8A24A;
  --gold-dim:#8C6F2F;
  --moss:#1F3B33;
  --cream:#F6F1E7;
  --paper:#FBF7EF;
  --ink:#241C15;
  --ember:#C2552F;
  --mist:#DCE6F1;

  --font-serif:"Source Han Serif SC","Songti SC","Noto Serif CJK SC",STSong,"SimSun",serif;
  --font-sans:"PingFang SC","HarmonyOS Sans SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono","Sarasa Mono SC",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --wrap:1240px;
  --gutter:20px;
  --radius-panel:20px;
  --radius-soft:14px;
  --line:rgba(36,28,21,.14);
  --line-gold:rgba(200,162,74,.55);
  --shadow-panel:0 28px 60px -50px rgba(18,58,107,.85);
}

/* ===== 3. 中文排版 ===== */
body{
  background:var(--cream);
  color:var(--ink);
  font-family:var(--font-sans);
  font-size:17px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
h1,h2,h3,h4{font-family:var(--font-serif);font-weight:600;line-height:1.24;letter-spacing:-.012em;color:var(--royal-deep)}
h1{font-size:clamp(2.1rem,5vw,4.4rem)}
h2{font-size:clamp(1.6rem,3.2vw,2.75rem)}
h3{font-size:clamp(1.18rem,1.9vw,1.5rem)}
p{text-wrap:pretty}
strong{font-weight:600;color:var(--royal-deep)}
code,kbd{font-family:var(--font-mono);font-size:.92em;letter-spacing:.02em}
::selection{background:var(--gold);color:var(--ink)}

/* ===== 4. 无障碍 ===== */
.skip-link{
  position:absolute;left:16px;top:-70px;z-index:400;
  background:var(--royal-deep);color:var(--cream);
  padding:10px 18px;border-radius:0 0 12px 12px;
  font-size:14px;letter-spacing:.06em;
  transition:top .2s ease;
}
.skip-link:focus{top:0}
:focus-visible{outline:2px solid var(--gold);outline-offset:3px;border-radius:4px}
.visually-hidden{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

/* ===== 5. 容器与网格 ===== */
.wrap{width:min(var(--wrap),calc(100% - var(--gutter) * 2));margin-inline:auto}
.wrap--narrow{width:min(760px,calc(100% - var(--gutter) * 2));margin-inline:auto}
.section{padding:clamp(48px,6vw,96px) 0}
.section--tight{padding:clamp(28px,3.6vw,56px) 0}
.grid{display:grid;gap:clamp(20px,3vw,36px)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--asym{grid-template-columns:minmax(0,5fr) minmax(0,7fr)}

/* ===== 6. 标题与标记 ===== */
.eyebrow{
  display:inline-block;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.26em;
  text-transform:uppercase;color:var(--gold-dim);
}
.eyebrow--ember{color:var(--ember)}
.section-head{display:grid;gap:12px;margin-bottom:clamp(22px,3vw,40px)}
.section-head__line{height:1px;background:linear-gradient(90deg,var(--gold),rgba(200,162,74,0))}
.lede{font-size:clamp(1rem,1.4vw,1.14rem);line-height:1.85;color:rgba(36,28,21,.78);max-width:62ch}
.rule-gold{height:1px;border:0;margin:0;background:var(--line-gold)}
.margin-note{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.24em;
  text-transform:uppercase;color:var(--gold-dim);
  writing-mode:vertical-rl;text-orientation:mixed;
}
.index-number{font-family:var(--font-mono);font-size:13px;letter-spacing:.08em;color:var(--gold-dim)}

/* ===== 7. 堆叠面板与卡片 ===== */
.panel{
  position:relative;
  background:var(--paper);
  border:1px solid var(--line);
  border-radius:var(--radius-panel);
  padding:clamp(22px,3.4vw,44px);
  box-shadow:var(--shadow-panel);
}
.panel--deep{background:var(--royal-deep);color:var(--cream);border-color:transparent}
.panel--deep h2,.panel--deep h3{color:var(--cream)}
.panel--deep .lede{color:rgba(246,241,231,.82)}
.panel--moss{background:var(--moss);color:var(--cream);border-color:transparent}
.panel--moss h2,.panel--moss h3{color:var(--cream)}
.panel--moss .lede{color:rgba(246,241,231,.82)}
.panel--gold-edge{border-top:3px solid var(--gold)}
.panel-stack{display:grid;gap:clamp(20px,3vw,34px)}
.card{
  position:relative;
  background:var(--paper);
  border:1px solid var(--line);
  border-radius:var(--radius-soft);
  padding:clamp(18px,2.4vw,28px);
  transition:transform .3s ease,border-color .3s ease,box-shadow .3s ease;
}
.card:hover{transform:translateY(-3px);border-color:var(--line-gold);box-shadow:var(--shadow-panel)}
.card__title{font-family:var(--font-serif);font-size:1.15rem;color:var(--royal-deep);margin-bottom:8px}
.card__text{font-size:14.5px;line-height:1.85;color:rgba(36,28,21,.72)}

/* ===== 8. 按钮 ===== */
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:12px 22px;border-radius:999px;
  font-size:14.5px;letter-spacing:.06em;line-height:1.2;
  border:1px solid transparent;
  transition:background .25s ease,color .25s ease,border-color .25s ease,transform .25s ease;
}
.btn:hover{transform:translateY(-2px)}
.btn--primary{background:var(--royal-deep);color:var(--cream)}
.btn--primary:hover{background:var(--royal-mid)}
.btn--gold{background:var(--gold);color:var(--ink)}
.btn--gold:hover{background:var(--gold-dim);color:var(--cream)}
.btn--ghost{border-color:rgba(36,28,21,.28);color:var(--ink)}
.btn--ghost:hover{border-color:var(--gold);color:var(--royal-deep)}
.btn--on-dark{border-color:rgba(246,241,231,.4);color:var(--cream)}
.btn--on-dark:hover{border-color:var(--gold);color:var(--gold)}

/* ===== 9. 标签与筛选 ===== */
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 11px;border-radius:999px;
  border:1px solid var(--line-gold);
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.1em;
  color:var(--gold-dim);text-transform:uppercase;
}
.tag--ember{border-color:rgba(194,85,47,.5);color:var(--ember)}
.chip{
  display:inline-flex;align-items:center;gap:6px;
  padding:6px 14px;border-radius:999px;
  border:1px solid var(--line-gold);
  background:rgba(251,247,239,.7);
  font-size:13px;color:var(--royal-deep);
  transition:background .2s ease,color .2s ease,border-color .2s ease;
}
.chip:hover{background:rgba(18,58,107,.08)}
.chip[aria-pressed="true"],.chip.is-active{background:var(--royal-deep);color:var(--cream);border-color:var(--royal-deep)}

/* ===== 10. 参数表 ===== */
.table-wrap{
  overflow-x:auto;-webkit-overflow-scrolling:touch;
  border:1px solid var(--line);border-radius:var(--radius-soft);
  background:var(--paper);
}
.data-table{width:100%;font-size:14px}
.data-table th,.data-table td{padding:12px 16px;text-align:left;border-bottom:1px solid var(--line);white-space:nowrap}
.data-table thead th{
  position:sticky;top:0;z-index:2;
  background:var(--mist);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;
  color:var(--royal-deep);font-weight:500;
}
.data-table tbody tr:nth-child(even){background:rgba(220,230,241,.5)}
.data-table tbody tr:hover{background:rgba(200,162,74,.14)}
.data-table td:first-child{font-family:var(--font-mono);font-size:13px;color:var(--royal-mid)}

/* ===== 11. 手风琴 ===== */
.accordion{border-top:1px solid var(--line-gold)}
.accordion__item{border-bottom:1px solid var(--line-gold)}
.accordion__trigger{
  display:flex;justify-content:space-between;align-items:center;gap:16px;
  width:100%;text-align:left;padding:18px 4px;
  font-family:var(--font-serif);font-size:1.05rem;color:var(--royal-deep);
}
.accordion__trigger::after{
  content:"+";font-family:var(--font-mono);font-size:16px;color:var(--gold-dim);
  transition:transform .25s ease;
}
.accordion__trigger[aria-expanded="true"]::after{transform:rotate(45deg)}
.accordion__panel{padding:0 4px 20px;font-size:14.5px;line-height:1.9;color:rgba(36,28,21,.78)}
.accordion__panel[hidden]{display:none}

/* ===== 12. 图片容器 ===== */
.figure{margin:0}
.figure__media{
  position:relative;overflow:hidden;
  border-radius:var(--radius-panel);
  border:1px solid var(--line);
  aspect-ratio:16/10;
  background:
    repeating-linear-gradient(115deg,rgba(18,58,107,.07) 0 1px,rgba(18,58,107,0) 1px 14px),
    linear-gradient(140deg,var(--mist) 0%,#eef2f7 46%,var(--cream) 100%);
}
.figure__media > img{width:100%;height:100%;object-fit:cover}
.figure__media--wide{aspect-ratio:21/9}
.figure__media--tall{aspect-ratio:3/4}
.figure__media--square{aspect-ratio:1/1}
.figure__caption{margin-top:10px;font-size:12.5px;letter-spacing:.03em;color:rgba(36,28,21,.6)}

/* ===== 13. 面包屑 ===== */
.breadcrumb{padding:22px 0 0}
.breadcrumb ol{display:flex;flex-wrap:wrap;align-items:center;gap:10px;font-size:12.5px;color:rgba(36,28,21,.6)}
.breadcrumb li + li::before{content:"/";color:var(--gold-dim)}
.breadcrumb a{color:var(--royal-mid)}
.breadcrumb a:hover{color:var(--royal-deep);text-decoration:underline;text-underline-offset:3px}
.breadcrumb [aria-current="page"]{color:var(--ink)}

/* ===== 14. 显现与进度 ===== */
.has-js [data-reveal]{
  opacity:0;transform:translateY(18px);
  transition:opacity .62s cubic-bezier(.22,.7,.3,1),transform .62s cubic-bezier(.22,.7,.3,1);
}
.has-js [data-reveal].is-visible{opacity:1;transform:none}
.scroll-progress{
  position:fixed;top:0;left:0;right:0;height:2px;z-index:200;
  pointer-events:none;
}
.scroll-progress__fill{
  display:block;height:100%;width:100%;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--gold-dim),var(--gold));
}

/* ===== 15. 页头 ===== */
.site-header{
  position:sticky;top:0;z-index:120;
  background:var(--paper);
  border-bottom:1px solid var(--line);
  transition:box-shadow .3s ease;
}
.site-header::after{
  content:"";position:absolute;left:0;right:0;bottom:-1px;height:1px;
  background:linear-gradient(90deg,rgba(200,162,74,0),var(--gold),rgba(200,162,74,0));
  opacity:.75;
}
.site-header.is-condensed{box-shadow:0 18px 40px -34px rgba(18,58,107,.92)}

.masthead{
  width:min(var(--wrap),calc(100% - var(--gutter) * 2));
  margin-inline:auto;
  display:grid;
  grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);
  align-items:center;
  gap:16px;
  padding:20px 0 12px;
  transition:padding .28s ease;
}
.site-header.is-condensed .masthead{padding:8px 0 6px}
.masthead__rail{display:flex;align-items:center;gap:16px;min-width:0}
.masthead__rail--left{justify-content:flex-start}
.masthead__rail--right{justify-content:flex-end}
.masthead__brand{display:flex;justify-content:center}

.rail-link{
  font-family:var(--font-mono);
  font-size:11.5px;letter-spacing:.16em;
  color:var(--gold-dim);
  padding-bottom:3px;
  border-bottom:1px solid transparent;
  white-space:nowrap;
  transition:color .2s ease,border-color .2s ease;
}
.rail-link:hover{color:var(--royal-deep);border-bottom-color:var(--gold)}
.rail-link--tel{color:var(--royal-deep);letter-spacing:.1em}

.brandmark{display:inline-flex;align-items:center;gap:14px;color:var(--royal-deep)}
.brandmark__seal{
  display:grid;place-items:center;
  width:46px;height:46px;flex:none;
  border:1px solid var(--gold);border-radius:12px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;
  color:var(--gold-dim);
  background:linear-gradient(150deg,rgba(200,162,74,.18),rgba(200,162,74,0));
  transition:transform .3s ease,width .28s ease,height .28s ease;
}
.brandmark:hover .brandmark__seal{transform:rotate(-6deg)}
.brandmark__type{display:flex;flex-direction:column;line-height:1.1}
.brandmark__name{
  font-family:var(--font-serif);
  font-size:clamp(1.35rem,2.5vw,1.9rem);
  font-weight:600;letter-spacing:.14em;
  transition:font-size .28s ease;
}
.brandmark__sub{
  margin-top:6px;
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.3em;
  color:var(--gold-dim);
}
.site-header.is-condensed .brandmark__name{font-size:1.28rem}
.site-header.is-condensed .brandmark__seal{width:36px;height:36px;font-size:11px;border-radius:10px}

.nav-toggle{
  display:none;align-items:center;gap:8px;
  padding:8px 12px;border-radius:999px;
  border:1px solid var(--line-gold);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;
  color:var(--royal-deep);
}
.nav-toggle__bars{position:relative;width:16px;height:10px;flex:none}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";position:absolute;left:0;right:0;height:1.5px;
  background:currentColor;transition:transform .25s ease;
}
.nav-toggle__bars::before{top:0}
.nav-toggle__bars::after{bottom:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{transform:translateY(4.25px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{transform:translateY(-4.25px) rotate(-45deg)}
.nav-toggle__text{white-space:nowrap}

.site-nav{
  width:min(var(--wrap),calc(100% - var(--gutter) * 2));
  margin-inline:auto;
  padding-bottom:12px;
  transition:padding .28s ease;
}
.site-header.is-condensed .site-nav{padding-bottom:8px}

.nav-primary{display:flex;flex-wrap:wrap;justify-content:center;gap:6px 30px}
.nav-primary a{
  position:relative;display:inline-block;
  padding:4px 0;
  font-size:14.5px;letter-spacing:.08em;color:var(--ink);
  transition:color .2s ease;
}
.nav-primary a::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:1px;
  background:var(--gold);transform:scaleX(0);transform-origin:0 50%;
  transition:transform .3s ease;
}
.nav-primary a:hover{color:var(--royal-deep)}
.nav-primary a:hover::after{transform:scaleX(1)}
.nav-primary a[aria-current="page"]{color:var(--royal-deep);font-weight:600}
.nav-primary a[aria-current="page"]::after{transform:scaleX(1)}

.nav-bands{
  display:grid;grid-template-columns:1fr 1fr;gap:12px 32px;
  margin-top:12px;padding-top:10px;
  border-top:1px solid var(--line-gold);
  transition:margin .28s ease,padding .28s ease;
}
.site-header.is-condensed .nav-bands{margin-top:6px;padding-top:6px}
.band{display:flex;align-items:center;gap:14px;min-width:0}
.band--region{justify-content:flex-start}
.band--series{justify-content:flex-end}
.band__label{
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.24em;
  color:var(--gold-dim);white-space:nowrap;
}
.band__list{display:flex;flex-wrap:wrap;gap:5px;min-width:0}
.band__list a{
  display:inline-block;
  padding:3px 11px;border-radius:999px;
  border:1px solid transparent;
  font-size:13px;color:var(--ink);
  transition:background .25s ease,color .25s ease,border-color .25s ease;
}
.band__list a:hover{
  background:rgba(18,58,107,.86);
  border-color:rgba(200,162,74,.6);
  color:var(--cream);
  backdrop-filter:blur(2px);
}

/* ===== 16. 页脚 ===== */
.site-footer{
  position:relative;
  margin-top:clamp(56px,8vw,110px);
  background:var(--moss);
  color:var(--cream);
}
.site-footer::before{
  content:"";position:absolute;top:0;left:0;right:0;height:3px;
  background:linear-gradient(90deg,var(--gold-dim),var(--gold),var(--gold-dim));
}
.footer__inner{
  width:min(var(--wrap),calc(100% - var(--gutter) * 2));
  margin-inline:auto;
  display:grid;
  grid-template-columns:minmax(0,1.7fr) repeat(2,minmax(0,1fr)) minmax(0,1.3fr);
  gap:32px 28px;
  padding:clamp(40px,5vw,72px) 0 clamp(28px,3vw,44px);
}
.footer__col{min-width:0}
.footer__claim{
  margin-top:16px;
  font-family:var(--font-serif);font-size:1.05rem;letter-spacing:.12em;
  color:var(--gold);
}
.footer__address{margin-top:10px;font-size:13.5px;line-height:1.9;color:rgba(246,241,231,.7)}
.footer__title{
  margin-bottom:18px;
  font-family:var(--font-mono);font-size:11px;font-weight:400;
  letter-spacing:.24em;color:rgba(246,241,231,.55);
}
.footer__list{display:grid;gap:9px}
.footer__list a{
  font-size:14.5px;color:rgba(246,241,231,.85);
  padding-bottom:2px;border-bottom:1px solid transparent;
  transition:color .2s ease,border-color .2s ease;
  word-break:break-all;
}
.footer__list a:hover{color:#fff;border-bottom-color:var(--gold)}
.footer__meta{
  margin-top:16px;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.08em;
  color:rgba(246,241,231,.5);
}
.brandmark--footer .brandmark__name{color:var(--cream);font-size:1.35rem}
.brandmark--footer .brandmark__seal{border-color:var(--gold);color:var(--gold)}
.footer__base{
  width:min(var(--wrap),calc(100% - var(--gutter) * 2));
  margin-inline:auto;
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:10px 24px;
  padding:18px 0 30px;
  border-top:1px solid rgba(246,241,231,.16);
  font-size:12.5px;color:rgba(246,241,231,.6);
}
.footer__note{max-width:62ch}
.footer__copy{font-family:var(--font-mono);letter-spacing:.06em}

/* ===== 17. 响应式 ===== */
@media (max-width:1100px){
  .footer__inner{grid-template-columns:minmax(0,1.5fr) repeat(2,minmax(0,1fr))}
  .footer__col--brand{grid-column:1 / -1}
}
@media (max-width:979px){
  .masthead{padding:14px 0 10px;gap:12px}
  .site-header.is-condensed .masthead{padding:8px 0 6px}
  .nav-toggle{display:inline-flex}
  .site-nav{
    position:absolute;top:100%;left:0;right:0;
    width:100%;margin:0;padding:0 var(--gutter);
    background:var(--paper);
    border-top:1px solid var(--line-gold);
    border-bottom:1px solid var(--line);
    box-shadow:0 30px 50px -40px rgba(18,58,107,.9);
    max-height:0;overflow:hidden;visibility:hidden;
    z-index:110;
    transition:max-height .38s cubic-bezier(.4,0,.2,1),visibility .38s;
  }
  .site-nav[data-open]{max-height:min(80vh,760px);overflow-y:auto;visibility:visible}
  .nav-primary{flex-direction:column;justify-content:flex-start;gap:0;padding:6px 0 10px}
  .nav-primary a{display:block;padding:13px 2px;font-size:16px;border-bottom:1px solid rgba(36,28,21,.09)}
  .nav-primary a::after{display:none}
  .nav-primary a[aria-current="page"]::before{
    content:"";display:inline-block;width:7px;height:7px;border-radius:50%;
    background:var(--gold);margin-right:10px;vertical-align:middle;
  }
  .nav-bands{
    grid-template-columns:minmax(0,1fr);gap:14px;
    margin-top:10px;padding:14px 0 22px;
    border-top:1px solid rgba(36,28,21,.12);
  }
  .band,.band--region,.band--series{
    flex-direction:column;align-items:flex-start;justify-content:flex-start;gap:8px;
  }
  .band__list{gap:6px}
  .grid--2,.grid--3,.grid--asym{grid-template-columns:minmax(0,1fr)}
  .footer__inner{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer__col--brand{grid-column:1 / -1}
}
@media (max-width:700px){
  body{font-size:16.5px}
  .masthead__rail--left{display:none}
  .brandmark__sub{display:none}
  .brandmark__seal{width:38px;height:38px;font-size:10.5px;border-radius:10px}
  .brandmark__name{font-size:1.35rem}
  .rail-link{font-size:10.5px;letter-spacing:.1em}
  .footer__inner{grid-template-columns:minmax(0,1fr);gap:28px}
  .footer__base{flex-direction:column;align-items:flex-start}
}

/* ===== 18. 减少动态 ===== */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .has-js [data-reveal]{opacity:1;transform:none;transition:none}
  .card:hover,.btn:hover{transform:none}
  *{animation-duration:.001ms !important;transition-duration:.001ms !important}
}