/* ==========================================================================
   维密中心 · 共享样式表  保存路径 /assets/site.css
   负责：reset / CSS 变量 / 中文排版 / 头部 / 页脚 / 通用组件 / 响应式
   页面专属布局请写入各自的页面 CSS，不在此文件内扩展
   ========================================================================== */

/* ---------- 01 · Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:104px}
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,picture,svg,video{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
table{border-collapse:collapse}
:focus-visible{outline:2px solid var(--pink-bright);outline-offset:3px}

/* ---------- 02 · 设计变量 ---------- */
:root{
  /* 色彩 */
  --black:#0A0A0C;
  --ink:#1C1C22;
  --pink:#E4007F;
  --pink-bright:#FF5FA2;
  --rose:#8E0B52;
  --gold:#C8A45C;
  --gold-deep:#8A6A28;
  --ivory:#F6EFE6;
  --white:#FFFFFF;
  --line:#DFDFE4;
  --graphite:#55555F;
  --pink-wash:#FFF2F8;

  /* 字体 */
  --font-serif:"Noto Serif SC","Source Han Serif SC","Songti SC",Georgia,"Times New Roman",serif;
  --font-sans:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono","SFMono-Regular",Consolas,"Liberation Mono",monospace;

  /* 字号阶梯 12/14/17/21/28/40/64/96 */
  --s1:.75rem; --s2:.875rem; --s3:1.0625rem; --s4:1.3125rem;
  --s5:1.75rem; --s6:2.5rem; --s7:4rem; --s8:6rem;

  /* 布局 */
  --shell:1180px;
  --gutter:clamp(18px,4vw,40px);
  --radius-pill:999px;
  --hair:1px solid var(--line);
  --hair-dark:1px solid rgba(223,223,228,.14);
  --hair-gold:1px solid rgba(200,164,92,.45);
  --shadow-lift:0 20px 44px -30px rgba(10,10,12,.6);

  /* 动效 */
  --ease:cubic-bezier(.22,.61,.36,1);
  --t:240ms;
  --t-slow:520ms;
}

/* ---------- 03 · 中文排版基准 ---------- */
body{
  background:var(--ivory);
  color:var(--black);
  font-family:var(--font-sans);
  font-size:17px;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
body.nav-open{overflow:hidden}
h1,h2,h3,h4{font-family:var(--font-serif);font-weight:700;line-height:1.2;letter-spacing:-.02em}
h1{font-size:clamp(2.4rem,6vw,5.5rem)}
h2{font-size:clamp(1.75rem,3.4vw,2.5rem)}
h3{font-size:var(--s4);font-weight:600;letter-spacing:-.01em}
h4{font-size:var(--s3);font-weight:600}
strong,b{font-weight:700}
.mono{font-family:var(--font-mono);font-size:.8125rem;letter-spacing:.08em}
.kicker{font-family:var(--font-mono);font-size:.75rem;letter-spacing:.18em;color:var(--pink);text-transform:uppercase}
.index-num{font-family:var(--font-mono);font-size:.75rem;letter-spacing:.12em;color:var(--gold-deep)}
.lede{font-size:var(--s4);line-height:1.7;color:var(--ink);max-width:34em}
.note{font-size:var(--s2);color:var(--graphite);line-height:1.65}
.section--dark .note,.section--dark .lede{color:rgba(246,239,230,.76)}
.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}

/* ---------- 04 · 布局容器 ---------- */
.shell{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:var(--gutter)}
.content-shell{padding-block:clamp(44px,6vw,88px)}
.section{padding-block:clamp(56px,8vw,112px)}
.section--ivory{background:var(--ivory)}
.section--dark{background:var(--black);color:var(--ivory)}
.prose{max-width:34em;font-size:var(--s3);line-height:1.75}
.prose p+p{margin-top:1.2em}
.prose a{border-bottom:1px solid var(--pink);color:var(--rose)}
.prose a:hover{border-bottom-color:var(--pink-bright);color:var(--pink)}
.stack{display:grid;gap:16px}
.stack--loose{display:grid;gap:32px}

/* ---------- 05 · 网格系统 ---------- */
.grid{display:grid;gap:clamp(20px,3vw,36px)}
.grid--3-9{grid-template-columns:minmax(0,1fr)}
.grid--5-7{grid-template-columns:minmax(0,1fr)}
.grid--cards{grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
@media (min-width:900px){
  .grid--3-9{grid-template-columns:minmax(0,3fr) minmax(0,9fr)}
  .grid--5-7{grid-template-columns:minmax(0,5fr) minmax(0,7fr)}
}

/* ---------- 06 · 通用元素 ---------- */
.divider{border:0;border-top:var(--hair);margin:0}
.divider--gold{border-top-color:var(--gold)}
.divider--dark{border-top:var(--hair-dark)}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5rem;
  padding:.72rem 1.3rem;
  border:1px solid transparent;border-radius:var(--radius-pill);
  font-family:var(--font-sans);font-size:var(--s2);font-weight:600;letter-spacing:.04em;line-height:1;
  white-space:nowrap;
  transition:background var(--t) var(--ease),color var(--t) var(--ease),border-color var(--t) var(--ease),transform var(--t) var(--ease);
}
.btn--primary{background:var(--pink);border-color:var(--pink);color:var(--white);box-shadow:0 12px 30px -20px rgba(228,0,127,.95)}
.btn--primary:hover{background:var(--pink-bright);border-color:var(--pink-bright);color:var(--black)}
.btn--outline{background:transparent;border-color:rgba(200,164,92,.6);color:var(--ivory)}
.btn--outline:hover{border-color:var(--gold);color:var(--white);background:rgba(200,164,92,.14)}
.btn--ghost{background:transparent;border-color:rgba(228,0,127,.45);color:var(--rose)}
.btn--ghost:hover{background:var(--pink-wash);border-color:var(--pink);color:var(--pink)}
.btn--dark{background:var(--black);border-color:var(--black);color:var(--ivory)}
.btn--dark:hover{background:var(--ink);border-color:var(--pink)}

.tag{
  display:inline-flex;align-items:center;gap:.35rem;
  padding:.2rem .55rem;border:1px solid var(--line);background:var(--white);
  font-family:var(--font-mono);font-size:.6875rem;letter-spacing:.1em;line-height:1.4;color:var(--graphite);
}
.tag--pink{border-color:rgba(228,0,127,.5);color:var(--pink)}
.tag--gold{border-color:rgba(200,164,92,.6);color:var(--gold-deep)}

.card{
  background:var(--white);border:var(--hair);padding:clamp(20px,2.4vw,28px);
  transition:transform var(--t) var(--ease),border-color var(--t) var(--ease),box-shadow var(--t) var(--ease);
}
.card:hover{transform:translateY(-2px);border-color:var(--gold);box-shadow:var(--shadow-lift)}
.card__meta{font-family:var(--font-mono);font-size:.6875rem;letter-spacing:.12em;color:var(--gold-deep);display:block;margin-bottom:.6rem}
.card__title{font-family:var(--font-serif);font-size:var(--s4);font-weight:700;line-height:1.3}
.card__text{margin-top:.6rem;font-size:var(--s2);color:var(--graphite);line-height:1.7}
.section--dark .card{background:var(--ink);border-color:rgba(223,223,228,.14)}
.section--dark .card__text{color:rgba(246,239,230,.72)}

/* 面包屑 */
.breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:.5rem;
  font-family:var(--font-mono);font-size:.75rem;letter-spacing:.08em;color:var(--graphite)}
.breadcrumb a{color:var(--graphite);border-bottom:1px solid transparent;padding-bottom:1px}
.breadcrumb a:hover{color:var(--pink);border-bottom-color:var(--pink)}
.breadcrumb__sep{color:var(--gold)}
.breadcrumb [aria-current="page"]{color:var(--black)}

/* 图片容器（页面阶段放置 img 与 alt） */
.media-frame{position:relative;overflow:hidden;background:var(--ink);border:var(--hair)}
.media-frame img{width:100%;height:100%;object-fit:cover}
.media-frame--wide{aspect-ratio:16/9}
.media-frame--tall{aspect-ratio:3/4}
.media-frame--square{aspect-ratio:1/1}
.media-frame--pink{border-color:rgba(228,0,127,.5)}
.media-frame__caption{
  position:absolute;left:0;right:0;bottom:0;padding:.7rem .8rem;
  background:linear-gradient(0deg,rgba(10,10,12,.85),rgba(10,10,12,0));
  color:rgba(246,239,230,.92);font-size:var(--s1);line-height:1.5;
}

/* 表格 */
.table-wrap{overflow-x:auto;background:var(--white);border:var(--hair)}
.data-table{width:100%;min-width:520px;background:var(--white);font-size:var(--s2)}
.data-table th,.data-table td{border:1px solid var(--line);padding:.75rem .9rem;text-align:left;vertical-align:top;line-height:1.6}
.data-table thead th{background:var(--ink);color:var(--ivory);font-family:var(--font-mono);font-weight:500;font-size:.6875rem;letter-spacing:.12em}
.data-table tbody tr:hover{background:var(--pink-wash)}
.data-table .is-frozen{position:sticky;left:0;background:var(--white);z-index:1}
.data-table tbody tr:hover .is-frozen{background:var(--pink-wash)}

/* 章节高亮（配合 data-chapter-link） */
[data-chapter-link]{transition:color var(--t) var(--ease),border-color var(--t) var(--ease)}
[data-chapter-link][data-active]{color:var(--pink-bright);border-color:var(--pink-bright)}

/* 显现 */
.js-on [data-reveal]{opacity:0;transform:translateY(14px);
  transition:opacity var(--t-slow) var(--ease),transform var(--t-slow) var(--ease)}
.js-on [data-reveal].is-visible{opacity:1;transform:none}

/* ---------- 07 · 跳转链接 ---------- */
.skip-link{
  position:fixed;top:0;left:0;z-index:300;
  padding:.8rem 1.3rem;background:var(--pink);color:var(--white);
  font-size:var(--s2);font-weight:600;letter-spacing:.05em;
  transform:translateY(-140%);transition:transform var(--t) var(--ease);
}
.skip-link:focus{transform:none}

/* ---------- 08 · 头部 ---------- */
.site-header{
  position:sticky;top:0;z-index:120;
  background:var(--black);color:var(--ivory);
  border-bottom:1px solid rgba(200,164,92,.32);
}
.site-header__progress{
  position:absolute;left:0;right:0;bottom:-1px;height:2px;
  background:rgba(246,239,230,.12);overflow:hidden;
}
.site-header__progress-fill{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--pink) 0%,var(--pink-bright) 100%);
  transition:width 120ms linear;
}

/* 上层：品牌说明 */
.site-header__top{
  background:linear-gradient(90deg,rgba(28,28,34,.98),rgba(28,28,34,.82));
  border-bottom:1px solid rgba(223,223,228,.1);
  max-height:96px;overflow:hidden;
  transition:max-height var(--t) var(--ease),opacity var(--t) var(--ease);
}
.site-header__top-inner{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:.5rem 1rem;padding-block:.5rem;
}
.site-header__brand-line{
  font-size:.8125rem;line-height:1.5;letter-spacing:.06em;color:rgba(246,239,230,.78);
}
.pill-link{
  display:inline-flex;align-items:center;gap:.4rem;
  padding:.28rem .75rem;border:1px solid rgba(200,164,92,.55);border-radius:var(--radius-pill);
  font-family:var(--font-mono);font-size:.6875rem;letter-spacing:.12em;line-height:1;color:var(--gold);
  white-space:nowrap;
  transition:background var(--t) var(--ease),color var(--t) var(--ease),border-color var(--t) var(--ease);
}
.pill-link:hover{background:rgba(200,164,92,.16);border-color:var(--gold);color:var(--white)}

/* 下层：品牌与栏目 */
.site-header__main{background:rgba(10,10,12,.94)}
.site-header__main-inner{
  display:flex;align-items:center;justify-content:space-between;gap:1rem;
  padding-block:.7rem;transition:padding var(--t) var(--ease);
}
.brandmark{display:inline-flex;align-items:baseline;gap:.55rem;color:var(--ivory)}
.brandmark__mono{font-family:var(--font-mono);font-size:.6875rem;letter-spacing:.16em;color:var(--gold)}
.brandmark__name{font-family:var(--font-serif);font-size:1.3rem;font-weight:700;letter-spacing:.02em;line-height:1}
.brandmark:hover .brandmark__name{color:var(--pink-bright)}

.nav-toggle{
  display:inline-flex;align-items:center;gap:.55rem;position:relative;z-index:140;
  padding:.5rem .7rem;border:1px solid rgba(223,223,228,.28);color:var(--ivory);
  font-family:var(--font-mono);font-size:.6875rem;letter-spacing:.14em;line-height:1;
}
.nav-toggle:hover{border-color:var(--gold)}
.nav-toggle__bars{position:relative;display:block;width:18px;height:10px}
.nav-toggle__bars::before,.nav-toggle__bars::after{
  content:"";position:absolute;left:0;width:100%;height:1.5px;background:currentColor;
  transition:transform var(--t) var(--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[aria-expanded="true"]{border-color:var(--pink);color:var(--pink-bright)}

/* 抽屉（移动端默认） */
.site-nav{
  position:fixed;top:0;right:0;bottom:0;left:auto;
  width:min(88vw,380px);z-index:130;
  display:flex;flex-direction:column;gap:1.35rem;
  padding:5.5rem var(--gutter) calc(2.2rem + env(safe-area-inset-bottom));
  background:linear-gradient(180deg,rgba(10,10,12,.99),rgba(28,28,34,.98));
  border-left:1px solid rgba(228,0,127,.45);
  overflow-y:auto;
  transform:translateX(102%);
  transition:transform var(--t) var(--ease);
}
.site-nav[data-open]{transform:translateX(0)}
.site-nav__group-label{font-family:var(--font-mono);font-size:.6875rem;letter-spacing:.18em;color:var(--gold)}
.site-nav__list{display:flex;flex-direction:column}
.site-nav__item{flex:0 0 auto}
.site-nav__link{
  display:flex;align-items:baseline;gap:.7rem;
  padding:.85rem .25rem;border-bottom:var(--hair-dark);
  font-size:var(--s3);line-height:1.35;color:rgba(246,239,230,.86);
  transition:color var(--t) var(--ease),padding-left var(--t) var(--ease);
}
.site-nav__link::before{
  content:attr(data-index);
  font-family:var(--font-mono);font-size:.6875rem;letter-spacing:.08em;color:rgba(200,164,92,.72);
}
.site-nav__link:hover,.site-nav__link:focus-visible{color:var(--white);padding-left:.65rem}
.site-nav__link[aria-current="page"]{color:var(--pink-bright)}
.site-nav__link[aria-current="page"]::before{color:var(--pink-bright)}
.site-nav__note{font-size:.8125rem;line-height:1.7;color:rgba(246,239,230,.62)}
.site-nav__cta{width:100%}
.site-scrim{position:fixed;inset:0;z-index:125;background:rgba(10,10,12,.62);backdrop-filter:blur(2px)}
.site-scrim[hidden]{display:none}

/* 收起状态：仅保留栏目与进度条 */
.site-header[data-condensed] .site-header__top{max-height:0;opacity:0;border-bottom-color:transparent}
.site-header[data-condensed] .site-header__main-inner{padding-block:.5rem}

@media (min-width:1040px){
  .nav-toggle{display:none}
  .site-nav{
    position:static;width:auto;z-index:auto;
    flex-direction:row;align-items:center;gap:1.6rem;
    padding:0;background:none;border-left:0;overflow:visible;
    transform:none;transition:none;
  }
  .site-nav[data-open]{transform:none}
  .site-nav__group-label,.site-nav__note{display:none}
  .site-nav__list{flex-direction:row;align-items:center;gap:1.5rem}
  .site-nav__link{
    padding:.35rem 0;border-bottom:0;position:relative;
    font-size:.9375rem;color:rgba(246,239,230,.8);
  }
  .site-nav__link::before{display:none}
  .site-nav__link::after{
    content:"";position:absolute;left:0;right:0;bottom:-2px;height:1px;background:var(--gold);
    transform:scaleX(0);transform-origin:left;transition:transform var(--t) var(--ease);
  }
  .site-nav__link:hover,.site-nav__link:focus-visible{padding-left:0;color:var(--white)}
  .site-nav__link:hover::after,.site-nav__link:focus-visible::after,.site-nav__link[aria-current="page"]::after{transform:scaleX(1)}
  .site-nav__link[aria-current="page"]{color:var(--pink-bright)}
  .site-nav__cta{width:auto;margin-left:.4rem}
  .site-scrim{display:none}
}

/* ---------- 09 · 页脚 ---------- */
.site-footer{
  background:var(--black);color:rgba(246,239,230,.78);
  border-top:1px solid rgba(228,0,127,.55);
}
.site-footer__inner{padding-block:clamp(44px,6vw,80px) clamp(24px,3vw,40px)}
.site-footer__masthead{
  display:grid;gap:.6rem;
  padding-bottom:clamp(24px,3vw,36px);margin-bottom:clamp(28px,4vw,48px);
  border-bottom:var(--hair-gold);
}
.site-footer__wordmark{font-family:var(--font-serif);font-size:clamp(1.75rem,4vw,2.5rem);font-weight:700;letter-spacing:-.02em;line-height:1;color:var(--ivory)}
.site-footer__tagline{font-size:var(--s2);color:rgba(246,239,230,.66);max-width:34em}

.site-footer__grid{display:grid;gap:clamp(28px,4vw,48px);grid-template-columns:minmax(0,1fr)}
@media (min-width:640px){.site-footer__grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (min-width:1040px){.site-footer__grid{grid-template-columns:repeat(4,minmax(0,1fr))}}

.footer-col{min-width:0}
.footer-col__title{
  margin-bottom:1rem;padding-bottom:.6rem;border-bottom:var(--hair-dark);
  font-family:var(--font-mono);font-size:.6875rem;font-weight:500;letter-spacing:.18em;
  color:var(--gold);text-transform:uppercase;
}
.footer-list{display:grid;gap:.6rem}
.footer-list__item{display:flex;align-items:baseline;gap:.5rem;font-size:.9375rem;line-height:1.6}
.footer-list__link{color:rgba(246,239,230,.78);border-bottom:1px solid transparent;transition:color var(--t) var(--ease),border-color var(--t) var(--ease)}
.footer-list__link:hover{color:var(--ivory);border-bottom-color:var(--pink)}
.footer-list__index{flex:0 0 auto;color:var(--gold);font-size:.6875rem;letter-spacing:.1em}

.footer-contact{display:grid;gap:.55rem;margin-top:1.1rem;font-size:.875rem;font-style:normal;line-height:1.65;color:rgba(246,239,230,.7)}
.footer-contact__row{display:flex;gap:.6rem;align-items:baseline}
.footer-contact__label{flex:0 0 3.1em;color:var(--gold);font-size:.6875rem;letter-spacing:.12em}

.site-footer__bottom{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:1rem 1.75rem;
  margin-top:clamp(32px,5vw,56px);padding-top:1.5rem;border-top:var(--hair-dark);
  font-size:.8125rem;
}
.site-footer__note{color:rgba(246,239,230,.6);max-width:34em}
.footer-legal{display:flex;flex-wrap:wrap;gap:1rem}
.footer-legal__link{color:rgba(246,239,230,.72);border-bottom:1px solid rgba(246,239,230,.28);padding-bottom:2px;
  transition:color var(--t) var(--ease),border-color var(--t) var(--ease)}
.footer-legal__link:hover{color:var(--pink-bright);border-bottom-color:var(--pink-bright)}
.site-footer__icp{color:rgba(246,239,230,.6)}
.site-footer__signature{
  margin-top:1.25rem;padding-top:1.25rem;border-top:1px solid rgba(200,164,92,.22);
  color:rgba(200,164,92,.88);font-size:.6875rem;letter-spacing:.1em;
}

/* ---------- 10 · 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}
  .js-on [data-reveal]{opacity:1;transform:none}
  .card:hover{transform:none}
  .site-nav__link:hover{transform:none}
}