/* SafeW · 量子纠缠·密语星空 —— 深空紫黑 + 品牌紫 + 电光青 */
:root{
  --bg:#0a0614; --bg2:#0f0a20; --panel:#150d2b; --panel2:#1a1033;
  --line:#2a1e4d; --line2:#382a63;
  --violet:#a855f7; --violet-d:#7c3aed; --violet-l:#c084fc;
  --cyan:#22d3ee; --magenta:#e879f9; --amber:#fbbf24;
  --text:#e9e4f5; --muted:#b0aac2; --dim:#7c7399;
  --grad:linear-gradient(135deg,#7c3aed 0%,#a855f7 48%,#c084fc 100%);
  --grad2:linear-gradient(135deg,#22d3ee 0%,#a855f7 100%);
  --radius:16px; --radius-sm:10px;
  --shadow:0 18px 50px -22px rgba(124,58,237,.55);
  --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(--text);line-height:1.8;font-size:16px;-webkit-font-smoothing:antialiased}
body::before{content:"";position:fixed;inset:0;z-index:-1;background:
  radial-gradient(1200px 700px at 82% -8%,rgba(168,85,247,.16),transparent 60%),
  radial-gradient(900px 600px at -8% 28%,rgba(34,211,238,.10),transparent 55%),
  radial-gradient(800px 700px at 60% 110%,rgba(232,121,249,.10),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{background:var(--grad2);-webkit-background-clip:text;background-clip:text;color:transparent}

.wrap{max-width:1180px;margin:0 auto;padding:0 22px}
.section{padding:78px 0}
.section--alt{background:linear-gradient(180deg,var(--bg2),transparent)}
.shead{max-width:760px;margin:0 auto 46px;text-align:center}
.shead--left{text-align:left;margin-left:0}
.eyebrow{display:inline-block;font-size:13px;letter-spacing:.12em;color:var(--cyan);font-weight:600;text-transform:uppercase;margin-bottom:14px}
.shead h2{font-size:30px;line-height:1.35;font-weight:700;letter-spacing:.01em}
.shead p{color:var(--muted);margin-top:14px;font-size:16px}

/* ============ 导航 ============ */
.nav{position:sticky;top:0;z-index:50;background:rgba(10,6,20,.82);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.nav-inner{max-width:1180px;margin:0 auto;padding:0 22px;height:64px;display:flex;align-items:center;gap:26px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:19px;letter-spacing:.02em}
.brand-logo{height:32px;width:auto;display:block;flex:0 0 auto}
.nav-links{display:flex;align-items:center;gap:6px;margin-left:6px}
.nav-links>li{position:relative}
.nav-links a{display:inline-flex;align-items:center;gap:5px;padding:8px 14px;border-radius:9px;color:var(--muted);font-size:15px;transition:.2s}
.nav-links a:hover{color:var(--text);background:rgba(168,85,247,.10)}
.nav-links a.active{color:var(--text);background:rgba(168,85,247,.14)}
.drop-menu{position:absolute;top:calc(100% + 8px);left:0;min-width:190px;background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:8px;opacity:0;visibility:hidden;transform:translateY(-6px);transition:.2s;box-shadow:var(--shadow)}
.nav-drop:hover .drop-menu{opacity:1;visibility:visible;transform:translateY(0)}
.drop-menu a{display:block;padding:9px 12px;border-radius:8px;font-size:14px}
.drop-menu a:hover{background:rgba(168,85,247,.12);color:var(--text)}
.nav-cta{margin-left:auto}
.nav-toggle{display:none;background:none;border:none;color:var(--text);cursor:pointer}

/* ============ 按钮 ============ */
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 22px;border-radius:12px;font-weight:600;font-size:15px;border:1px solid transparent;cursor:pointer;transition:.22s;white-space:nowrap}
.btn .icon svg{width:17px;height:17px}
.btn svg{width:17px;height:17px;flex:none}
.btn-primary{background:var(--grad);color:#fff;box-shadow:0 10px 26px -10px rgba(168,85,247,.75)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 16px 34px -12px rgba(168,85,247,.85)}
.btn-ghost{color:var(--text);border-color:var(--line2);background:rgba(168,85,247,.06)}
.btn-ghost:hover{border-color:var(--violet);background:rgba(168,85,247,.12)}

/* ============ Hero(分屏) ============ */
.hero{padding:74px 0 62px;position:relative;overflow:hidden}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center}
.hero-kicker{display:inline-flex;align-items:center;gap:8px;font-size:13px;letter-spacing:.1em;color:var(--cyan);font-weight:600;margin-bottom:18px}
.hero-kicker::before{content:"";width:26px;height:1px;background:var(--cyan)}
.hero-title{font-size:46px;line-height:1.18;font-weight:800;letter-spacing:-.01em;margin-bottom:20px}
.hero-lead{color:var(--muted);font-size:17px;max-width:520px;margin-bottom:28px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:30px}
.hero-stats{display:flex;gap:34px;flex-wrap:wrap}
.stat .stat-num{font-size:24px;font-weight:800;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.stat .stat-lab{font-size:13px;color:var(--dim);margin-top:2px}
.hero-visual{position:relative;min-height:360px;display:flex;align-items:center;justify-content:center}
.hero-visual::before{content:"";position:absolute;inset:10%;background:radial-gradient(circle,rgba(168,85,247,.22),transparent 65%);filter:blur(6px)}
.hero-visual svg{position:relative;width:100%;max-width:430px;height:auto}

/* ============ 网格/卡片 ============ */
.grid{display:grid;gap:22px}
.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}
.card:hover{transform:translateY(-4px);border-color:var(--violet);box-shadow:var(--shadow)}
.card-icon{width:44px;height:44px;border-radius:11px;background:rgba(168,85,247,.14);display:flex;align-items:center;justify-content:center;margin-bottom:16px;color:var(--violet-l)}
.card-icon svg{width:22px;height:22px}
.card h3{font-size:18px;margin-bottom:9px}
.card p{color:var(--muted);font-size:15px}
.card.read-more{margin-top:12px;color:var(--cyan);font-size:14px;font-weight:600}
.bento{display:grid;grid-template-columns:repeat(6,1fr);gap:22px}
.bento-cell{grid-column:span 2;background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:28px}
.bento-cell.b3{grid-column:span 3}
.bento-cell.b6{grid-column:span 6}
.bento-cell h3{font-size:19px;margin:16px 0 9px;display:flex;align-items:center;gap:10px}

/* ============ 分屏图文 ============ */
.split{display:grid;grid-template-columns:1fr 1fr;gap:52px;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:14px;width:10px;height:10px;border-radius:3px;background:var(--grad)}
.split-media{border-radius:var(--radius);overflow:hidden;border:1px solid var(--line);position:relative}
.split-media img{width:100%;aspect-ratio:16/10;object-fit:cover}

/* ============ 步骤 ============ */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.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(--cyan);letter-spacing:.1em;display:block;margin-bottom:12px}
.step h3{font-size:18px;margin-bottom:9px}
.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(168,85,247,.12);color:var(--text);text-align:left;padding:14px 18px;font-weight:600}
td{padding:13px 18px;border-top:1px solid var(--line);color:var(--muted)}
tr:hover td{background:rgba(168,85,247,.05)}

/* ============ 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(--text);font-size:16px;font-weight:600;text-align:left;cursor:pointer;font-family:inherit}
.faq-q .plus{color:var(--violet-l);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(34,211,238,.08);border:1px solid rgba(34,211,238,.25);border-left:3px solid var(--cyan);border-radius:var(--radius-sm);padding:16px 20px;color:var(--muted);font-size:15px;margin:22px 0}
.callout{background:rgba(168,85,247,.10);border:1px solid var(--line2);border-left:3px solid var(--violet);border-radius:var(--radius-sm);padding:20px 24px;color:var(--text);font-size:15px;margin:26px 0}

/* ============ 面包屑 ============ */
.crumbs{max-width:1180px;margin:0 auto;padding:20px 22px 0;font-size:13px;color:var(--dim)}
.crumbs a:hover{color:var(--cyan)}
.crumbs .sep{margin:0 8px;color:var(--dim)}

/* ============ 文章双栏 ============ */
.article-wrap{max-width:1180px;margin:0 auto;padding:34px 22px 70px;display:grid;grid-template-columns:260px 1fr;gap:44px;align-items:start}
.toc{position:sticky;top:88px;background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:22px}
.toc-title{font-size:14px;color:var(--cyan);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(--cyan);padding-left:4px}
.article{max-width:780px}
.article-h1{font-size:34px;line-height:1.3;margin-bottom:16px}
.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(--text);background:var(--panel);border-left:3px solid var(--violet);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(--violet);line-height:1.4}
.article-body h3{font-size:18px;margin:26px 0 12px;color:var(--violet-l)}
.article-body p{color:#cfc8e0;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:#cfc8e0}
.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:#cfc8e0;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(168,85,247,.16);color:var(--violet-l);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}
.related .grid{margin-top:0}

/* ============ 页脚 ============ */
.footer{border-top:1px solid var(--line);margin-top:40px;background:var(--bg2)}
.footer-inner{max-width:1180px;margin:0 auto;padding:0 22px;height:74px;display:flex;align-items:center;justify-content:space-between}
.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:55vh;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:60px 22px}
.center-hero h1{font-size:72px;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;font-weight:800}
.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(--text);font-size:16px;outline:none}
.search-box input:focus{border-color:var(--violet);box-shadow:0 0 0 3px rgba(168,85,247,.2)}
.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(--violet)}
.search-results a b{color:var(--violet-l)}
.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(--cyan)}

/* ============ 返回顶部 ============ */
.to-top{position:fixed;right:24px;bottom:24px;width:46px;height:46px;border-radius:12px;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}

/* ============ 量子粒子动画 ============ */
@keyframes floaty{0%,100%{transform:translateY(0)}50%{transform:translateY(-14px)}}
@keyframes pulse{0%,100%{opacity:.55}50%{opacity:1}}
@keyframes spin-slow{to{transform:rotate(360deg)}}
.hero-visual .p1{animation:floaty 6s ease-in-out infinite}
.hero-visual .p2{animation:floaty 6s ease-in-out infinite reverse}
.hero-visual .ring{transform-origin:center;animation:spin-slow 26s linear infinite}

/* ============ 响应式 ============ */
@media(max-width:960px){
  .hero-grid,.split,.article-wrap{grid-template-columns:1fr}
  .hero-title{font-size:34px}
  .hero-visual{min-height:260px}
  .g3,.g4,.steps{grid-template-columns:1fr 1fr}
  .bento{grid-template-columns:1fr 1fr}
  .bento-cell.b6{grid-column:span 2}
  .toc{position:static}
  .nav-links{display:none}
  .nav-toggle{display:block;margin-left:auto}
  .nav-cta{display:none}
}
@media(max-width:600px){
  .g3,.g4,.steps,.g2{grid-template-columns:1fr}
  .bento{grid-template-columns:1fr}
  .bento-cell,.bento-cell.b3,.bento-cell.b6{grid-column:span 1}
  .hero-title{font-size:29px}
  .section{padding:56px 0}
}