/* SafeW · 火漆密信·暖纸书函 —— 暖纸白 + 火漆红 + 墨蓝, 居中 hero + 火漆印章信封 */
:root{
  --bg:#faf6ef; --bg2:#f3ecdf; --panel:#fffdf7; --panel2:#fbf6ea;
  --line:#e8dfce; --line2:#d8cbb4;
  --seal:#b03a2e; --seal-d:#8c2b20; --seal-l:#c94f3a;
  --ink:#24374e; --muted:#6b5f50; --dim:#9a8f7d;
  --amber:#d9822b; --gold:#c9923f;
  --grad:linear-gradient(135deg,#8c2b20 0%,#b03a2e 50%,#c94f3a 100%);
  --grad2:linear-gradient(135deg,#d9822b 0%,#b03a2e 100%);
  --radius:14px; --radius-sm:10px;
  --shadow:0 16px 40px -20px rgba(176,58,46,.35);
  --serif:Georgia,"Noto Serif SC","Songti SC","STSong","SimSun",serif;
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:var(--font);background:var(--bg);color:var(--ink);line-height:1.85;font-size:16px;-webkit-font-smoothing:antialiased}
body::before{content:"";position:fixed;inset:0;z-index:-1;background:
  radial-gradient(1000px 600px at 50% -10%,rgba(217,130,43,.07),transparent 60%),
  radial-gradient(800px 700px at 0% 100%,rgba(176,58,46,.05),transparent 55%),var(--bg)}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
ul,ol{list-style:none}
.icon{display:inline-flex;vertical-align:-3px}
.icon svg{display:block}
.hl{color:var(--seal);font-style:italic}
h1,h2,h3,h4{font-family:var(--serif);color:var(--ink);font-weight:700}

.wrap{max-width:1120px;margin:0 auto;padding:0 22px}
.section{padding:74px 0}
.section--alt{background:linear-gradient(180deg,var(--bg2),transparent)}
.shead{max-width:760px;margin:0 auto 44px;text-align:center}
.shead--left{text-align:left;margin-left:0}
.eyebrow{display:inline-block;font-size:13px;letter-spacing:.14em;color:var(--seal);font-weight:700;text-transform:uppercase;margin-bottom:12px}
.eyebrow::before{content:"◆ ";color:var(--amber)}
.shead h2{font-size:31px;line-height:1.35;font-weight:700}
.shead p{color:var(--muted);margin-top:14px;font-size:16px}

/* ============ 导航(居中两行) ============ */
.nav{position:sticky;top:0;z-index:50;background:rgba(250,246,239,.92);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.nav-inner{max-width:1120px;margin:0 auto;padding:14px 22px 12px;display:flex;flex-direction:column;align-items:center;gap:10px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:20px;letter-spacing:.04em;font-family:var(--serif)}
.brand-logo{height:34px;width:auto;display:block;flex:0 0 auto}
.nav-links{display:flex;align-items:center;gap:4px;flex-wrap:wrap;justify-content:center}
.nav-links a{display:inline-flex;padding:8px 16px;border-radius:999px;color:var(--muted);font-size:15px;transition:.2s}
.nav-links a:hover{color:var(--seal);background:rgba(176,58,46,.07)}
.nav-links a.active{color:#fff;background:var(--seal)}
.nav-toggle{display:none;background:none;border:none;color:var(--ink);cursor:pointer;font-size:20px}

/* ============ 按钮 ============ */
.btn{display:inline-flex;align-items:center;gap:8px;padding:13px 24px;border-radius:10px;font-weight:600;font-size:15px;border:1px solid transparent;cursor:pointer;transition:.22s;white-space:nowrap}
.btn svg{width:17px;height:17px;flex:none}
.btn .icon svg{width:17px;height:17px}
.btn-primary{background:var(--grad);color:#fff;box-shadow:0 10px 24px -10px rgba(176,58,46,.6)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 16px 32px -12px rgba(176,58,46,.7)}
.btn-ghost{color:var(--seal);border-color:var(--line2);background:transparent}
.btn-ghost:hover{border-color:var(--seal);background:rgba(176,58,46,.05)}

/* ============ Hero(居中) ============ */
.hero{padding:66px 0 58px;position:relative}
.hero-center{max-width:840px;margin:0 auto;text-align:center}
.hero-seal{width:120px;height:120px;margin:0 auto 22px}
.hero-seal svg{width:100%;height:100%}
.hero-kicker{display:inline-block;font-size:13px;letter-spacing:.12em;color:var(--seal);font-weight:700;margin-bottom:16px;text-transform:uppercase}
.hero-title{font-size:44px;line-height:1.22;font-weight:700;margin-bottom:20px;font-family:var(--serif)}
.hero-lead{color:var(--muted);font-size:17px;max-width:640px;margin:0 auto 28px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;justify-content:center;margin-bottom:30px}
.hero-stats{display:flex;gap:36px;flex-wrap:wrap;justify-content:center}
.stat .stat-num{font-size:24px;font-weight:700;color:var(--seal);font-family:var(--serif)}
.stat .stat-lab{font-size:13px;color:var(--dim);margin-top:2px}

/* ============ 网格/卡片 ============ */
.grid{display:grid;gap:20px}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:26px;transition:.22s;position:relative}
.card:hover{transform:translateY(-4px);border-color:var(--seal);box-shadow:var(--shadow)}
.card-icon{width:44px;height:44px;border-radius:50%;background:rgba(176,58,46,.1);display:flex;align-items:center;justify-content:center;margin-bottom:16px;color:var(--seal)}
.card-icon svg{width:22px;height:22px}
.card h3{font-size:18px;margin-bottom:9px;font-family:var(--serif)}
.card p{color:var(--muted);font-size:15px}
.read-more{display:inline-block;margin-top:12px;color:var(--seal);font-size:14px;font-weight:600}

/* ============ 分屏图文 ============ */
.split{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
.split-copy h2{font-size:28px;line-height:1.4;margin-bottom:16px}
.split-copy p{color:var(--muted);margin-bottom:14px}
.split-copy ul li{padding:7px 0 7px 26px;position:relative;color:var(--muted)}
.split-copy ul li::before{content:"";position:absolute;left:0;top:15px;width:10px;height:10px;border-radius:50%;background:var(--grad)}
.split-media{border-radius:var(--radius);overflow:hidden;border:1px solid var(--line);position:relative;box-shadow:var(--shadow)}
.split-media img{width:100%;aspect-ratio:16/10;object-fit:cover}

/* ============ 步骤 ============ */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.step{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:28px;position:relative}
.step-no{font-size:13px;font-weight:700;color:var(--seal);letter-spacing:.1em;display:block;margin-bottom:12px;font-family:var(--serif)}
.step h3{font-size:18px;margin-bottom:9px;font-family:var(--serif)}
.step p{color:var(--muted);font-size:15px}

/* ============ 表格 ============ */
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius)}
table{width:100%;border-collapse:collapse;font-size:15px}
th{background:rgba(176,58,46,.08);color:var(--ink);text-align:left;padding:14px 18px;font-weight:700;font-family:var(--serif)}
td{padding:13px 18px;border-top:1px solid var(--line);color:var(--muted)}
tr:hover td{background:rgba(176,58,46,.04)}

/* ============ FAQ ============ */
.faq{max-width:820px;margin:0 auto}
.faq-item{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius-sm);margin-bottom:14px;overflow:hidden}
.faq-q{width:100%;display:flex;justify-content:space-between;align-items:center;gap:14px;padding:18px 22px;background:none;border:none;color:var(--ink);font-size:16px;font-weight:600;text-align:left;cursor:pointer;font-family:inherit}
.faq-q .plus{color:var(--seal);font-size:22px;line-height:1;transition:.2s}
.faq-a{display:none;padding:0 22px 20px;color:var(--muted);font-size:15px}
.faq-item.open .faq-a{display:block}
.faq-item.open .plus{transform:rotate(45deg)}

/* ============ 提示/警示 ============ */
.tip{background:rgba(217,130,43,.08);border:1px solid rgba(217,130,43,.3);border-left:3px solid var(--amber);border-radius:var(--radius-sm);padding:16px 20px;color:var(--muted);font-size:15px;margin:22px 0}
.callout{background:rgba(176,58,46,.07);border:1px solid var(--line2);border-left:3px solid var(--seal);border-radius:var(--radius-sm);padding:20px 24px;color:var(--ink);font-size:15px;margin:26px 0}

/* ============ 面包屑 ============ */
.crumbs{max-width:1120px;margin:0 auto;padding:20px 22px 0;font-size:13px;color:var(--dim)}
.crumbs a:hover{color:var(--seal)}
.crumbs .sep{margin:0 8px;color:var(--dim)}

/* ============ 文章双栏 ============ */
.article-wrap{max-width:1120px;margin:0 auto;padding:34px 22px 70px;display:grid;grid-template-columns:250px 1fr;gap:44px;align-items:start}
.toc{position:sticky;top:96px;background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:22px}
.toc-title{font-size:14px;color:var(--seal);letter-spacing:.08em;margin-bottom:14px;font-weight:700}
.toc ul li a{display:block;padding:7px 0;font-size:14px;color:var(--muted);border-bottom:1px solid var(--line);transition:.15s}
.toc ul li:last-child a{border-bottom:none}
.toc ul li a:hover{color:var(--seal);padding-left:4px}
.article{max-width:780px}
.article-h1{font-size:33px;line-height:1.3;margin-bottom:16px;font-family:var(--serif)}
.article-meta{display:flex;gap:18px;color:var(--dim);font-size:14px;margin-bottom:22px}
.article-meta span{display:inline-flex;align-items:center;gap:6px}
.lead{font-size:18px;color:var(--ink);background:var(--panel);border-left:3px solid var(--seal);border-radius:var(--radius-sm);padding:18px 22px;margin:0 0 26px;line-height:1.75}
.article-body h2{font-size:23px;margin:40px 0 16px;padding-left:14px;border-left:3px solid var(--seal);line-height:1.4;font-family:var(--serif)}
.article-body h3{font-size:18px;margin:26px 0 12px;color:var(--seal-d);font-family:var(--serif)}
.article-body p{color:#3c4a5a;margin-bottom:16px;font-size:16px}
.article-body ul{margin:0 0 18px;padding-left:4px}
.article-body ul li{position:relative;padding:6px 0 6px 24px;color:#3c4a5a}
.article-body ul li::before{content:"";position:absolute;left:0;top:14px;width:8px;height:8px;border-radius:50%;background:var(--grad)}
.article-body ol{counter-reset:st;margin:0 0 18px;padding-left:4px}
.article-body ol li{position:relative;padding:6px 0 6px 34px;color:#3c4a5a;counter-increment:st}
.article-body ol li::before{content:counter(st);position:absolute;left:0;top:6px;width:22px;height:22px;border-radius:7px;background:rgba(176,58,46,.12);color:var(--seal);font-size:13px;font-weight:700;display:flex;align-items:center;justify-content:center}
.article-body img{border-radius:var(--radius);margin:22px 0;border:1px solid var(--line)}
.article-body table{margin:20px 0}
.related{margin-top:48px;padding-top:30px;border-top:1px solid var(--line)}
.related>h3{font-size:20px;margin-bottom:18px;font-family:var(--serif)}
.related .grid{margin-top:0}

/* ============ 页脚 ============ */
.footer{border-top:1px solid var(--line);margin-top:40px;background:var(--bg2)}
.footer-inner{max-width:1120px;margin:0 auto;padding:0 22px;height:74px;display:flex;align-items:center;justify-content:center;gap:12px}
.footer-inner .brand-logo{height:22px}
.footer-inner .brand{font-size:15px}
.copyright{color:var(--dim);font-size:14px}

/* ============ 工具页 ============ */
.center-hero{min-height:52vh;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:60px 22px}
.center-hero h1{font-size:64px;color:var(--seal);font-weight:700;font-family:var(--serif)}
.center-hero h2{font-size:26px;margin:12px 0 10px}
.center-hero p{color:var(--muted);margin-bottom:22px}
.search-box{width:100%;max-width:520px}
.search-box input{width:100%;padding:15px 20px;border-radius:13px;border:1px solid var(--line2);background:var(--panel);color:var(--ink);font-size:16px;outline:none}
.search-box input:focus{border-color:var(--seal);box-shadow:0 0 0 3px rgba(176,58,46,.18)}
.search-results{margin-top:24px;max-width:560px;text-align:left}
.search-results a{display:block;padding:13px 18px;background:var(--panel);border:1px solid var(--line);border-radius:var(--radius-sm);margin-bottom:10px}
.search-results a:hover{border-color:var(--seal)}
.search-results a b{color:var(--seal)}
.sitemap-list{margin-top:20px}
.sitemap-list a{display:block;padding:8px 0;color:var(--muted);border-bottom:1px dashed var(--line)}
.sitemap-list a:hover{color:var(--seal)}

/* ============ 返回顶部 ============ */
.to-top{position:fixed;right:24px;bottom:24px;width:46px;height:46px;border-radius:50%;background:var(--grad);color:#fff;border:none;cursor:pointer;display:flex;align-items:center;justify-content:center;box-shadow:var(--shadow);opacity:0;visibility:hidden;transition:.25s;z-index:60}
.to-top.show{opacity:1;visibility:visible}
.to-top svg{width:20px;height:20px}

/* ============ 火漆印章动画 ============ */
@keyframes seal-press{0%{transform:scale(.9) rotate(-4deg);opacity:.5}60%{transform:scale(1.08) rotate(2deg)}100%{transform:scale(1) rotate(0);opacity:1}}
@keyframes floaty{0%,100%{transform:translateY(0)}50%{transform:translateY(-9px)}}
.hero-seal svg{animation:seal-press 1.4s ease-out .15s both}
.hero-seal .seal-wax{transform-origin:center}

/* ============ 响应式 ============ */
@media(max-width:960px){
  .split,.article-wrap{grid-template-columns:1fr}
  .hero-title{font-size:34px}
  .g3,.g4,.steps{grid-template-columns:1fr 1fr}
  .toc{position:static}
  .nav-links{display:none}
  .nav-inner{flex-direction:row;justify-content:space-between}
  .nav-toggle{display:block}
}
@media(max-width:600px){
  .g3,.g4,.steps,.g2{grid-template-columns:1fr}
  .hero-title{font-size:29px}
  .section{padding:54px 0}
}