:root{
--bg-paper:#F5F0E6;
--bg-cream:#FAF6ED;
--ink:#2B1A12;
--accent:#E05A33;
--green:#3D7B46;
--blue:#1E3A5F;
--yellow:#F2B134;
--red:#C0392B;
--gray:#D8D3C8;
--gold:#B89B72;
--deep-green:#1F3A2D;
--border:rgba(43,26,18,.12);
--shadow-card:4px 4px 0 rgba(43,26,18,.08);
--shadow-btn:3px 3px 0 rgba(43,26,18,.9);
--sans:"Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
--serif:"Noto Serif SC","Songti SC",serif;
--mono:"Source Code Pro",Consolas,"SF Mono",monospace;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
font-family:var(--sans);
font-size:16px;
line-height:1.75;
color:var(--ink);
background-color:var(--bg-paper);
background-image:radial-gradient(ellipse 1100px 500px at 12% -5%,rgba(242,177,52,.10),transparent 60%),radial-gradient(ellipse 900px 520px at 95% 20%,rgba(61,123,70,.07),transparent 62%),radial-gradient(ellipse 900px 700px at 50% 115%,rgba(30,58,95,.06),transparent 58%),linear-gradient(to right,rgba(43,26,18,.045) 1px,transparent 1px),linear-gradient(to bottom,rgba(43,26,18,.045) 1px,transparent 1px);
background-size:auto,auto,auto,40px 40px,40px 40px;
min-height:100vh;
overflow-x:hidden;
}
img,picture,video,canvas,svg{display:block;max-width:100%}
input,button,textarea,select{font:inherit;color:inherit}
button{appearance:none;-webkit-appearance:none;background:none;border:none;cursor:pointer}
a{color:var(--blue);text-decoration-thickness:1px;text-underline-offset:2px}
a:hover{color:var(--accent)}
h1,h2,h3,h4{line-height:1.25;color:var(--ink)}
p{margin-bottom:1em}
ul,ol{padding-left:1.2em}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
::selection{background:var(--accent);color:var(--bg-paper)}
body.nav-open{overflow:hidden}
.container{width:100%;max-width:1280px;margin:0 auto;padding:0 clamp(16px,3.5vw,40px)}
.visually-hidden{position:absolute!important;width:1px!important;height:1px!important;margin:-1px!important;padding:0!important;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0!important}
#main-content{position:relative;padding-top:120px;min-height:60vh}
#main-content:focus{outline:none}
.skip-link{position:fixed;top:-60px;left:16px;z-index:3000;background:var(--accent);color:var(--bg-paper);padding:10px 18px;border-radius:0 0 6px 6px;font-weight:700;font-size:14px;text-decoration:none;transition:top .2s ease}
.skip-link:focus{top:0;color:var(--bg-paper)}
/* ---------- 按钮 ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 26px;border-radius:2px;font-family:var(--sans);font-weight:700;font-size:15px;line-height:1.4;text-decoration:none;border:1px solid transparent;cursor:pointer;transition:transform .15s ease,box-shadow .15s ease,background-color .2s ease,color .2s ease,border-color .2s ease}
.btn:active{transform:translateY(1px)}
.btn-primary{background:var(--accent);color:var(--bg-paper);box-shadow:var(--shadow-btn)}
.btn-primary:hover{background:var(--red);color:var(--bg-paper);box-shadow:4px 4px 0 rgba(43,26,18,.9)}
.btn-outline{background:transparent;color:var(--ink);border-color:rgba(43,26,18,.35)}
.btn-outline:hover{background:var(--ink);color:var(--bg-paper);border-color:var(--ink)}
.btn-sm{padding:8px 16px;font-size:13px}
/* ---------- 面包屑 ---------- */
.breadcrumb-nav{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-family:var(--mono);font-size:12px;color:rgba(43,26,18,.55);margin-bottom:24px}
.breadcrumb-nav a{color:var(--blue);text-decoration:none}
.breadcrumb-nav a:hover{color:var(--accent);text-decoration:underline}
.crumb-sep{color:var(--accent)}
.breadcrumb-nav [aria-current="page"]{color:var(--ink);font-weight:700}
/* ---------- 页面骨架 ---------- */
.page-head{padding:clamp(24px,5vw,64px) 0 32px;border-bottom:1px solid var(--border);margin-bottom:40px}
.page-eyebrow{display:inline-flex;align-items:center;gap:10px;font-family:var(--mono);font-size:11px;letter-spacing:.18em;color:var(--blue);text-transform:uppercase;margin-bottom:16px}
.page-eyebrow::before{content:"";width:24px;height:1px;background:var(--accent)}
.page-title{font-family:var(--sans);font-weight:300;font-size:clamp(42px,7vw,88px);line-height:1.05;letter-spacing:-.02em;max-width:12em}
.page-title em{font-style:normal;font-weight:900;color:var(--accent)}
.page-title .title-en{font-family:var(--mono);font-size:.22em;font-weight:400;color:var(--blue);letter-spacing:.16em;display:block;margin-top:8px}
.page-intro{font-family:var(--serif);font-size:clamp(16px,2vw,19px);color:rgba(43,26,18,.72);max-width:680px;margin-top:18px;line-height:1.8}
/* ---------- 章节坐标标题 ---------- */
.section-marker{display:flex;align-items:center;gap:12px;font-family:var(--mono);font-size:11px;letter-spacing:.18em;text-transform:uppercase;color:var(--blue);margin-bottom:12px}
.section-marker::before{content:"";width:28px;height:1px;background:var(--accent);flex-shrink:0}
.section-marker::after{content:"";flex:1;height:1px;background:var(--border)}
.section-marker .marker-index{color:var(--accent);font-weight:700}
/* ---------- 基础组件 ---------- */
.tag-label{display:inline-flex;align-items:center;gap:6px;padding:5px 12px;border:1px solid var(--gold);background:rgba(184,155,114,.10);color:var(--blue);font-family:var(--mono);font-size:12px;letter-spacing:.06em;white-space:nowrap}
.tag-label::before{content:"";width:5px;height:5px;background:var(--accent);border-radius:50%}
.archive-card{position:relative;background:var(--bg-cream);border:1px solid rgba(43,26,18,.18);box-shadow:var(--shadow-card);padding:24px 20px 20px;margin-top:24px}
.archive-card::before{content:attr(data-index);position:absolute;top:-1px;left:18px;height:24px;padding:3px 14px 4px;background:var(--yellow);color:var(--ink);font-family:var(--mono);font-size:11px;line-height:16px;letter-spacing:.04em;border:1px solid rgba(43,26,18,.2);border-bottom:none}
.archive-card .card-title{font-size:20px;font-weight:900;margin-bottom:8px}
.archive-card .card-meta{font-family:var(--mono);font-size:11px;color:rgba(43,26,18,.5);margin-bottom:12px}
.archive-card p{font-size:14px;color:rgba(43,26,18,.78)}
.paper-sheet{position:relative;background:var(--bg-cream);border:1px solid rgba(43,26,18,.14);box-shadow:1px 1px 0 var(--gold),2px 2px 0 rgba(43,26,18,.08),6px 6px 0 rgba(43,26,18,.06)}
.tilt-block{position:relative;transform:rotate(-1.2deg);transform-origin:center}
.metric{display:grid;gap:2px}
.metric-value{font-family:var(--mono);font-size:clamp(34px,5vw,56px);font-weight:700;line-height:1.1;color:var(--accent);font-variant-numeric:tabular-nums}
.metric-unit{font-family:var(--mono);font-size:14px;color:var(--blue)}
.metric-label{font-size:12px;letter-spacing:.12em;color:rgba(43,26,18,.6)}
.image-frame{position:relative;background:var(--gray);border:1px solid rgba(43,26,18,.16);box-shadow:var(--shadow-card);overflow:hidden;aspect-ratio:4/3}
.image-frame--wide{aspect-ratio:16/9}
.image-frame--portrait{aspect-ratio:3/4}
.image-frame img,.image-frame video{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.image-frame::after{content:attr(data-caption);position:absolute;left:0;right:0;bottom:0;padding:28px 14px 10px;background:linear-gradient(to top,rgba(43,26,18,.72),transparent);color:var(--bg-paper);font-family:var(--mono);font-size:11px;letter-spacing:.04em}
.grid-paper{background-image:linear-gradient(to right,rgba(43,26,18,.05) 1px,transparent 1px),linear-gradient(to bottom,rgba(43,26,18,.05) 1px,transparent 1px);background-size:40px 40px}
/* ---------- 滚动进度 ---------- */
.scroll-progress{position:fixed;top:0;left:0;height:3px;width:0;background:linear-gradient(90deg,var(--accent),var(--yellow));border-radius:0 2px 2px 0;z-index:2000;pointer-events:none}
/* ---------- 页头 ---------- */
.site-header{position:fixed;top:0;left:0;right:0;z-index:1000;background:rgba(245,240,230,.94);border-bottom:1px solid rgba(43,26,18,.10);transition:box-shadow .25s ease,background-color .25s ease}
.site-header.is-scrolled{box-shadow:0 4px 16px rgba(43,26,18,.10);background:rgba(245,240,230,.97)}
.header-top{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:12px 0;transition:padding .25s ease}
.site-header.is-scrolled .header-top{padding:6px 0}
.brand-lockup{display:inline-flex;align-items:center;gap:12px;text-decoration:none;color:var(--ink)}
.brand-mark{position:relative;display:inline-block;width:36px;height:36px;background:var(--deep-green);border-radius:3px;overflow:hidden;flex-shrink:0;box-shadow:1px 1px 0 rgba(43,26,18,.25)}
.brand-mark-slab{position:absolute;top:15px;left:-6px;width:140%;height:6px;background:var(--accent);transform:rotate(-14deg);box-shadow:0 12px 0 var(--yellow)}
.brand-mark-bar{position:absolute;right:0;bottom:0;width:9px;height:12px;background:var(--yellow);border-radius:1px 0 0 0}
.brand-copy{display:flex;align-items:baseline;gap:6px;flex-wrap:wrap}
.brand-name{font-size:clamp(20px,2.6vw,26px);font-weight:900;letter-spacing:.04em;line-height:1.1;color:var(--ink)}
.brand-tagline{font-family:var(--serif);font-size:clamp(11px,1.4vw,14px);color:var(--blue);letter-spacing:.28em}
.header-meta{display:inline-flex;align-items:center;gap:10px;font-family:var(--mono);font-size:11px;letter-spacing:.08em;color:rgba(43,26,18,.55);white-space:nowrap}
.header-meta-coord{color:var(--blue)}
.header-meta-sync{color:var(--accent);font-weight:700}
.header-meta-sep{opacity:.35}
.nav-toggle{display:none;align-items:center;justify-content:center;flex-direction:column;gap:4px;width:44px;height:44px;border-radius:50%;border:1px solid rgba(43,26,18,.15);background:var(--deep-green);box-shadow:0 4px 14px rgba(31,58,45,.28);position:relative}
.nav-toggle-line{width:18px;height:2px;background:var(--bg-paper);border-radius:2px;transition:transform .25s ease,opacity .25s ease}
.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(1){transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(3){transform:translateY(-6px) rotate(-45deg)}
/* ---------- 导航 ---------- */
.nav-shell{position:relative;border-top:1px solid rgba(43,26,18,.10);background:rgba(245,240,230,.88);transition:border-color .25s ease}
.site-header.is-scrolled .nav-shell{border-top-color:rgba(224,90,51,.35)}
.nav-shell-inner{display:flex;align-items:stretch;justify-content:space-between;gap:20px}
.nav-shell-head{display:none}
.nav-shell-intro{display:flex;flex-direction:column;justify-content:center;gap:2px;border-right:1px solid var(--border);padding-right:20px;min-width:220px}
.nav-shell-intro-label{font-family:var(--mono);font-size:10px;letter-spacing:.14em;color:var(--accent);text-transform:uppercase}
.nav-shell-intro-text{font-family:var(--serif);font-size:13px;color:rgba(43,26,18,.7);letter-spacing:.04em}
.primary-nav{display:flex;align-items:stretch;flex-wrap:wrap;gap:2px;flex:1}
.nav-link{display:inline-flex;align-items:center;gap:8px;padding:12px 14px;font-size:14px;font-weight:700;color:var(--ink);text-decoration:none;position:relative;white-space:nowrap;transition:color .2s ease,background-color .2s ease}
.nav-link-index{font-family:var(--mono);font-size:10px;color:var(--accent);opacity:.8}
.nav-link:hover{color:var(--accent);background:rgba(224,90,51,.06)}
.nav-link::after{content:"";position:absolute;left:14px;right:14px;bottom:6px;height:2px;background:var(--accent);transform:scaleX(0);transform-origin:left;transition:transform .22s ease}
.nav-link:hover::after,.nav-link[aria-current="page"]::after{transform:scaleX(1)}
.nav-link[aria-current="page"]{color:var(--accent)}
.nav-link[aria-current="page"] .nav-link-index{opacity:1}
.nav-shell-status{display:flex;align-items:center;justify-content:flex-end;gap:8px;font-family:var(--mono);font-size:11px;color:rgba(43,26,18,.55);letter-spacing:.04em;padding-left:20px;border-left:1px solid var(--border);white-space:nowrap;max-width:240px;text-align:right}
/* ---------- 回到顶部 ---------- */
.back-top{position:fixed;right:22px;bottom:22px;z-index:950;width:48px;height:48px;border-radius:50%;border:1px solid rgba(43,26,18,.18);background:var(--bg-cream);box-shadow:0 8px 20px rgba(43,26,18,.16);color:var(--ink);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;cursor:pointer;opacity:0;visibility:hidden;transform:translateY(12px);transition:opacity .25s ease,transform .25s ease,visibility .25s,background-color .2s ease}
.back-top.is-visible{opacity:1;visibility:visible;transform:translateY(0)}
.back-top:hover{background:var(--accent);color:var(--bg-paper);border-color:var(--accent)}
.back-top-arrow{font-family:var(--mono);font-size:16px;font-weight:700;line-height:1}
.back-top-label{font-family:var(--mono);font-size:8px;letter-spacing:.2em;line-height:1}
/* ---------- 页脚 ---------- */
.site-footer{position:relative;background:var(--deep-green);color:rgba(245,240,230,.8);overflow:hidden;margin-top:clamp(48px,8vw,96px)}
.site-footer::before{content:"";position:absolute;inset:0;pointer-events:none;background:linear-gradient(to right,rgba(245,240,230,.04) 1px,transparent 1px),linear-gradient(to bottom,rgba(245,240,230,.04) 1px,transparent 1px);background-size:32px 32px}
.site-footer::after{content:"";position:absolute;right:-120px;bottom:-120px;width:340px;height:340px;border-radius:50%;background:radial-gradient(circle,rgba(61,123,70,.25),transparent 68%);pointer-events:none}
.site-footer .container{position:relative;z-index:1}
.footer-top{display:flex;justify-content:space-between;align-items:center;gap:20px;flex-wrap:wrap;padding:36px 0 24px;border-bottom:1px solid rgba(245,240,230,.14)}
.footer-brand{display:inline-flex;align-items:center;gap:14px}
.footer-brand .brand-mark{background:var(--bg-paper)}
.footer-brand .brand-mark-slab{background:var(--accent);box-shadow:0 12px 0 var(--yellow)}
.footer-brand .brand-mark-bar{background:var(--blue)}
.footer-brand-text{font-size:20px;font-weight:900;letter-spacing:.03em;color:var(--bg-paper)}
.footer-coord{font-family:var(--mono);font-size:11px;letter-spacing:.1em;color:rgba(245,240,230,.5)}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1.4fr;gap:48px;padding:44px 0}
.footer-panel{min-width:0;counter-reset:foot-index}
.footer-panel-contact{border-left:1px solid rgba(245,240,230,.12);padding-left:24px}
.footer-heading{font-family:var(--mono);font-size:12px;font-weight:700;letter-spacing:.18em;text-transform:uppercase;color:var(--yellow);margin-bottom:18px;display:flex;align-items:center;gap:8px}
.footer-heading::before{content:"";width:6px;height:6px;background:var(--accent);transform:rotate(45deg);flex-shrink:0}
.footer-links{list-style:none;display:grid;gap:10px}
.footer-links a{display:inline-flex;align-items:baseline;gap:8px;color:rgba(245,240,230,.78);text-decoration:none;font-size:14px;transition:color .2s ease,padding-left .2s ease}
.footer-links a::before{content:"[" counter(foot-index,decimal-leading-zero) "]";counter-increment:foot-index;font-family:var(--mono);font-size:10px;color:var(--gold);opacity:.75}
.footer-links a:hover{color:var(--yellow);padding-left:4px}
.footer-contact-list{list-style:none;display:grid;gap:12px;margin-bottom:20px}
.footer-contact-list li{padding-left:12px;border-left:2px solid rgba(242,177,52,.45);font-size:13px;line-height:1.55;color:rgba(245,240,230,.82)}
.footer-contact-list small{display:block;font-family:var(--mono);font-size:10px;letter-spacing:.14em;color:rgba(245,240,230,.42);margin-bottom:2px}
.footer-trust-panel{border:1px solid rgba(245,240,230,.14);border-left:3px solid var(--yellow);background:rgba(245,240,230,.05);padding:16px 16px 14px}
.footer-trust-label{display:inline-block;font-family:var(--mono);font-size:10px;letter-spacing:.22em;text-transform:uppercase;color:var(--yellow);margin-bottom:8px}
.footer-trust-text{font-size:12.5px;line-height:1.8;color:rgba(245,240,230,.7)}
.footer-bottom{display:flex;justify-content:space-between;align-items:center;gap:12px 24px;flex-wrap:wrap;padding:20px 0 24px;border-top:1px solid rgba(245,240,230,.12)}
.footer-meta{display:inline-flex;align-items:center;gap:12px;flex-wrap:wrap;font-family:var(--mono);font-size:11px;color:rgba(245,240,230,.55)}
.footer-meta-sep{opacity:.4}
.footer-status{display:inline-flex;align-items:center;gap:8px;font-size:12px;color:rgba(245,240,230,.62)}
.footer-status::before{content:"";width:7px;height:7px;border-radius:50%;background:#6FA87A;box-shadow:0 0 0 3px rgba(111,168,122,.18)}
/* ---------- 渐显 ---------- */
.js-enabled [data-reveal]{opacity:0;transform:translateY(18px);transition:opacity .6s ease,transform .6s ease}
.js-enabled [data-reveal].is-revealed{opacity:1;transform:none}
/* ---------- 响应式 ---------- */
@media (max-width:1199px){
.nav-shell-intro,.nav-shell-status{display:none}
.nav-shell-inner{justify-content:center}
#main-content{padding-top:104px}
}
@media (max-width:899px){
#main-content{padding-top:76px}
.header-top{padding:10px 0}
.site-header.is-scrolled .header-top{padding:6px 0}
.header-meta{display:none}
.nav-toggle{display:flex}
.nav-shell{position:fixed;top:0;right:0;bottom:0;width:min(86vw,380px);z-index:1200;transform:translateX(105%);visibility:hidden;transition:transform .35s cubic-bezier(.22,.8,.36,1),visibility .35s;background:var(--bg-paper);border-left:1px solid rgba(43,26,18,.14);border-top:none;box-shadow:-18px 0 44px rgba(43,26,18,.18);overflow-y:auto}
.nav-shell[data-open]{transform:translateX(0);visibility:visible}
.nav-shell-inner{display:flex;flex-direction:column;justify-content:flex-start;align-items:stretch;gap:0;min-height:100%;padding-top:84px;padding-bottom:32px}
.nav-shell-head{display:flex;justify-content:space-between;align-items:center;padding-bottom:14px;border-bottom:1px solid var(--border);margin-bottom:8px}
.nav-shell-head-label{font-family:var(--mono);font-size:10px;letter-spacing:.18em;color:var(--accent);text-transform:uppercase}
.nav-shell-close{width:36px;height:36px;border-radius:50%;border:1px solid rgba(43,26,18,.25);background:transparent;font-size:22px;line-height:1;color:var(--ink);transition:background-color .2s ease,color .2s ease,border-color .2s ease}
.nav-shell-close:hover{background:var(--accent);color:var(--bg-paper);border-color:var(--accent)}
.nav-shell-intro{display:flex;border-right:none;padding-right:0;min-width:0;border-bottom:1px solid var(--border);padding-bottom:16px;margin-bottom:12px}
.primary-nav{flex-direction:column;align-items:stretch}
.nav-link{padding:14px 4px;font-size:18px;border-bottom:1px solid rgba(43,26,18,.08)}
.nav-link::after{display:none}
.nav-shell-status{display:flex;padding-left:0;margin-top:auto;padding-top:24px;border-left:none;border-top:1px solid var(--border);max-width:none;text-align:left;justify-content:flex-start}
.footer-grid{grid-template-columns:1fr;gap:32px;padding:32px 0}
.footer-panel-contact{border-left:none;padding-left:0}
.footer-bottom{flex-direction:column;align-items:flex-start}
.back-top{right:16px;bottom:16px}
}
@media (max-width:559px){
.brand-tagline{letter-spacing:.16em}
.footer-top{flex-direction:column;align-items:flex-start}
.footer-brand-text{font-size:17px}
}
/* ---------- 动效偏好 ---------- */
@media (prefers-reduced-motion:reduce){
html{scroll-behavior:auto}
*,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
.js-enabled [data-reveal]{opacity:1;transform:none;transition:none}
.nav-shell,.skip-link,.header-top,.back-top{transition:none}
}