/* ===== 基础重置与变量 ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --color-primary:#B85C3A;
  --color-gold:#D4AF37;
  --color-bg-cream:#FFF8E7;
  --color-text-dark:#2E1A0E;
  --color-bg-light:#F5F0EB;
  --color-bg-white:#FFFFFF;
  --color-accent:#C05A36;
  --color-shadow:rgba(26,10,0,0.1);
  --color-text-on-primary:#FFFFFF;
  --color-border-light:rgba(46,26,14,0.12);
  --font-heading:'Noto Serif SC','Georgia','Times New Roman',serif;
  --font-body:'Noto Sans SC','PingFang SC','Microsoft YaHei','Helvetica Neue',sans-serif;
  --spacing-xs:0.5rem;
  --spacing-sm:1rem;
  --spacing-md:2rem;
  --spacing-lg:3rem;
  --spacing-xl:5rem;
  --container-max:1280px;
  --header-height:auto;
  --transition:0.3s ease;
  --reveal-duration:0.6s;
}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:var(--font-body);line-height:1.6;color:var(--color-text-dark);background:var(--color-bg-cream);-webkit-font-smoothing:antialiased}
img,svg{display:block;max-width:100%;height:auto}
ul{list-style:none}
a{color:inherit;text-decoration:none}
a:focus-visible,.skip-link:focus-visible,.nav-link:focus-visible,.footer-link:focus-visible,.nav-toggle:focus-visible{outline:3px solid var(--color-gold);outline-offset:4px;border-radius:2px}
/* ===== 跳过链接 ===== */
.skip-link{position:fixed;top:0;left:0;z-index:10000;padding:0.8rem 1.6rem;background:var(--color-primary);color:var(--color-text-on-primary);font-family:var(--font-body);font-weight:500;transform:translateY(-100%);transition:transform 0.3s}
.skip-link:focus{transform:translateY(0)}
/* ===== 头部 ===== */
.site-header{background:var(--color-bg-cream);border-bottom:1px solid var(--color-border-light);position:sticky;top:0;z-index:1000}
.header-inner{max-width:var(--container-max);margin:0 auto;padding:var(--spacing-sm) var(--spacing-md);display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:var(--spacing-sm)}
.brand-masthead{display:flex;align-items:baseline;gap:0.25rem;font-family:var(--font-heading);letter-spacing:0.04em}
.brand-name{font-size:clamp(2rem,5vw,3.2rem);font-weight:700;color:var(--color-primary);line-height:1.1}
.brand-suffix{font-size:clamp(1rem,2.5vw,1.6rem);font-weight:400;color:var(--color-gold);text-transform:uppercase}
.nav-toggle{display:none;background:transparent;border:2px solid var(--color-primary);padding:0.4rem 0.8rem;cursor:pointer;align-items:center;gap:0.3rem;color:var(--color-primary);font-size:0.9rem;border-radius:4px;transition:background var(--transition),color var(--transition)}
.nav-toggle:hover{background:var(--color-primary);color:var(--color-text-on-primary)}
.nav-toggle-icon{display:inline-block;width:1.2em;height:1.2em;background:currentColor;mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2'%3E%3Cline x1='3' y1='6' x2='21' y2='6'/%3E%3Cline x1='3' y1='12' x2='21' y2='12'/%3E%3Cline x1='3' y1='18' x2='21' y2='18'/%3E%3C/svg%3E") no-repeat center/contain;-webkit-mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2'%3E%3Cline x1='3' y1='6' x2='21' y2='6'/%3E%3Cline x1='3' y1='12' x2='21' y2='12'/%3E%3Cline x1='3' y1='18' x2='21' y2='18'/%3E%3C/svg%3E") no-repeat center/contain}
.nav-toggle-text{font-weight:500}
.nav-primary{width:100%}
.nav-list{display:flex;flex-wrap:wrap;justify-content:center;gap:0.2rem var(--spacing-sm);padding:var(--spacing-xs) 0 0}
.nav-link{display:inline-block;padding:0.3rem 0.6rem;font-family:var(--font-heading);font-size:clamp(0.9rem,1.2vw,1.1rem);letter-spacing:0.05em;color:var(--color-text-dark);border-radius:4px;transition:background var(--transition),color var(--transition),box-shadow var(--transition);position:relative}
.nav-link:hover{background:rgba(184,92,58,0.08);color:var(--color-primary)}
.nav-link[aria-current="page"]{color:var(--color-primary);box-shadow:inset 0 -2px 0 var(--color-gold)}
/* ===== 移动导航 ===== */
@media (max-width:767px){
  .header-inner{flex-wrap:wrap;justify-content:space-between}
  .nav-toggle{display:inline-flex}
  .nav-primary{overflow:hidden;max-height:0;opacity:0;transition:max-height 0.5s ease,opacity 0.3s ease}
  .nav-primary[data-open]{max-height:600px;opacity:1}
  .nav-list{flex-direction:column;align-items:center;gap:0.1rem}
  .nav-link{font-size:1.1rem;padding:0.6rem 1.2rem}
}
/* ===== 页脚 ===== */
.site-footer{background:var(--color-bg-light);border-top:3px solid var(--color-primary);padding:var(--spacing-lg) var(--spacing-md) var(--spacing-md);margin-top:var(--spacing-xl);color:var(--color-text-dark)}
.footer-inner{max-width:var(--container-max);margin:0 auto;display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:var(--spacing-md)}
.footer-col{padding:0 var(--spacing-xs)}
.footer-logo{font-family:var(--font-heading);font-size:1.8rem;font-weight:700;color:var(--color-primary);letter-spacing:0.03em}
.footer-logo-suffix{color:var(--color-gold);font-size:1.2rem}
.footer-tagline{font-size:0.9rem;opacity:0.8;margin-top:0.3rem}
.footer-heading{font-family:var(--font-heading);font-size:1.1rem;font-weight:600;color:var(--color-accent);margin-bottom:var(--spacing-xs);border-bottom:2px solid var(--color-gold);display:inline-block;padding-bottom:0.2rem}
.footer-list{display:flex;flex-direction:column;gap:0.4rem}
.footer-link{font-size:0.95rem;transition:color var(--transition);border-bottom:1px solid transparent}
.footer-link:hover{color:var(--color-primary);border-bottom-color:var(--color-gold)}
.footer-text{font-size:0.95rem;opacity:0.85}
.footer-legal{margin-top:0}
.footer-icp{font-size:0.85rem;opacity:0.7;margin-top:var(--spacing-sm);letter-spacing:0.02em}
.footer-copy{font-size:0.85rem;opacity:0.6;margin-top:0.2rem}
@media (max-width:767px){
  .footer-inner{grid-template-columns:1fr 1fr}
  .footer-legal{grid-column:1 / -1;text-align:center;padding-top:var(--spacing-sm)}
}
@media (max-width:480px){
  .footer-inner{grid-template-columns:1fr}
}
/* ===== 通用按钮 ===== */
.btn{display:inline-flex;align-items:center;gap:0.4rem;padding:0.8rem 1.6rem;border:2px solid var(--color-primary);border-radius:6px;background:transparent;color:var(--color-primary);font-family:var(--font-body);font-size:1rem;font-weight:500;cursor:pointer;transition:all var(--transition);text-align:center}
.btn:hover{background:var(--color-primary);color:var(--color-text-on-primary)}
.btn-gold{border-color:var(--color-gold);color:var(--color-gold)}
.btn-gold:hover{background:var(--color-gold);color:var(--color-text-dark)}
.btn-ghost{border-color:transparent;background:transparent}
.btn-ghost:hover{background:rgba(184,92,58,0.08)}
/* ===== 面包屑 ===== */
.breadcrumb{display:flex;flex-wrap:wrap;gap:0.4rem 0.8rem;padding:var(--spacing-sm) 0;font-size:0.9rem;opacity:0.85}
.breadcrumb-item{display:inline-flex;align-items:center}
.breadcrumb-item + .breadcrumb-item::before{content:'/';margin-right:0.4rem;opacity:0.4}
.breadcrumb-link{color:var(--color-primary);border-bottom:1px solid transparent;transition:border-color var(--transition)}
.breadcrumb-link:hover{border-bottom-color:var(--color-gold)}
/* ===== 正文容器 ===== */
.content-section{max-width:var(--container-max);margin:0 auto;padding:0 var(--spacing-md)}
.content-grid{display:grid;gap:var(--spacing-lg);grid-template-columns:1fr}
@media (min-width:768px){.content-grid--two{grid-template-columns:1fr 1fr}}
.article-body{max-width:720px;margin:0 auto}
.article-body p{font-size:1.05rem;line-height:1.7;margin-bottom:1.2rem}
.article-body h2{font-family:var(--font-heading);font-size:2rem;margin:2rem 0 1rem;color:var(--color-primary)}
/* ===== 卡片基础 ===== */
.card{background:var(--color-bg-white);border:1px solid var(--color-border-light);border-radius:8px;padding:var(--spacing-md);box-shadow:0 4px 12px var(--color-shadow);transition:transform var(--transition),box-shadow var(--transition)}
.card:hover{transform:translateY(-4px);box-shadow:0 8px 24px var(--color-shadow)}
/* ===== 滚动显现 ===== */
[data-reveal]{opacity:0;transform:translateY(30px);transition:opacity var(--reveal-duration) ease,transform var(--reveal-duration) ease}
[data-reveal].is-revealed{opacity:1;transform:translateY(0)}
@media (prefers-reduced-motion:reduce){
  [data-reveal]{opacity:1;transform:none;transition:none}
}
/* ===== 滚动进度条 ===== */
[data-progress-bar]{position:fixed;top:0;left:0;width:0;height:4px;background:linear-gradient(90deg,var(--color-gold),var(--color-primary));z-index:10000;pointer-events:none;transition:width 0.1s linear}
@media (prefers-reduced-motion:reduce){[data-progress-bar]{display:none}}
/* ===== 返回顶部 ===== */
[data-scroll-top]{position:fixed;bottom:2rem;right:2rem;z-index:999;width:3rem;height:3rem;border-radius:50%;background:var(--color-gold);color:var(--color-text-dark);border:2px solid var(--color-primary);display:flex;align-items:center;justify-content:center;opacity:0;visibility:hidden;transform:translateY(20px);transition:opacity 0.3s,visibility 0.3s,transform 0.3s;cursor:pointer;font-size:1.4rem;line-height:1;box-shadow:0 4px 12px rgba(0,0,0,0.15)}
[data-scroll-top].is-visible{opacity:1;visibility:visible;transform:translateY(0)}
[data-scroll-top]:hover{background:var(--color-primary);color:var(--color-text-on-primary)}
@media (prefers-reduced-motion:reduce){[data-scroll-top]{transition:none}}
/* ===== 实用工具 ===== */
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}