/* ==========================================================================
   闪连  —— 曜金 Molten Gold「光轨跃迁」主题
   暖白底 + 曜金渐变;分屏 hero、光轨数据带、光速隧道 / 轨道节点 / 光轨数据带
   ========================================================================== */

:root{
  --bg:#faf7f1; --bg-soft:#f4eee2; --bg-deep:#ece2cf;
  --ink:#241c10; --ink-soft:#4a3c28; --muted:#7a6a4f; --faint:#a69378;
  --gold:#d99a2b; --amber:#f2b544; --copper:#c7742e; --bronze:#8a5a24;
  --deep:#16130e;
  --line:#eadfca; --line-soft:#f2ead9;
  --panel:#fffdf8;
  --grad:linear-gradient(120deg,#f2b544 0%,#d99a2b 46%,#c7742e 100%);
  --grad-text:linear-gradient(115deg,#c7742e 0%,#d99a2b 50%,#f2b544 100%);
  --grad-soft:linear-gradient(120deg,rgba(217,154,43,.12),rgba(242,181,68,.14));
  --mono:"Cascadia Code","Consolas","JetBrains Mono","SFMono-Regular",monospace;
  --shadow:0 1px 2px rgba(36,28,16,.05),0 12px 30px -18px rgba(36,28,16,.18);
  --shadow-lg:0 24px 60px -30px rgba(36,28,16,.32);
  --r:16px;
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.75;font-size:16px}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
ul,ol{padding-left:1.3em}
.wrap{max-width:1180px;margin:0 auto;padding:0 24px}

/* ===== 顶部曜金光束条 ===== */
.signal-strip{height:4px;background:var(--grad);position:relative;z-index:60;overflow:hidden}
.signal-strip::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,transparent,rgba(255,255,255,.7),transparent);
  transform:translateX(-100%);animation:beam 4.5s ease-in-out infinite}
@keyframes beam{0%{transform:translateX(-100%)}60%,100%{transform:translateX(100%)}}

/* ===== 导航 masthead ===== */
.masthead{position:sticky;top:0;z-index:50;background:rgba(250,247,241,.86);
  backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);border-bottom:1px solid var(--line)}
.masthead .wrap{padding-top:14px;padding-bottom:10px}
.brand-row{display:flex;align-items:center;justify-content:space-between;gap:18px;padding-bottom:12px}
.wordmark{display:flex;align-items:center;gap:11px;flex-shrink:0}
.wm-mark{width:34px;height:34px;border-radius:10px;border:1px solid var(--line);flex:none;display:block;
  box-shadow:0 6px 16px -6px rgba(217,154,43,.4)}
.mastfoot .wm-mark{width:28px;height:28px;border-radius:9px;border-color:rgba(255,255,255,.2)}
.wm-text{display:flex;flex-direction:column;line-height:1.15}
.wm-name{font-size:20px;font-weight:800;letter-spacing:.02em;color:var(--ink)}
.wm-sub{font-family:var(--mono);font-size:10px;letter-spacing:.14em;color:var(--muted);margin-top:2px}
.nav-actions{display:flex;align-items:center;gap:10px;flex-shrink:0}
.nav-row{display:flex;align-items:center;justify-content:center;gap:2px;border-top:1px solid var(--line-soft);padding-top:10px}
.nav-wrap{display:flex;align-items:center;gap:2px}
.nav-wrap>a{position:relative;padding:9px 14px;font-size:15px;font-weight:500;color:var(--ink-soft);border-radius:9px}
.nav-wrap>a:hover{background:var(--bg-soft);color:var(--gold)}
.nav-wrap>a.on{color:var(--gold);font-weight:700}
.nav-wrap>a.on::after{content:"";position:absolute;left:14px;right:14px;bottom:2px;height:2px;background:var(--grad);border-radius:2px}
.dd{position:relative}
.dd>button{background:none;border:none;font:inherit;font-size:15px;font-weight:500;color:var(--ink-soft);padding:9px 14px;border-radius:9px;cursor:pointer;font-family:inherit}
.dd>button:hover{background:var(--bg-soft);color:var(--gold)}
.dd-menu{position:absolute;top:calc(100% + 8px);left:50%;transform:translateX(-50%);min-width:210px;
  background:var(--panel);border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow-lg);
  padding:8px;display:none;flex-direction:column;z-index:60}
.dd:hover .dd-menu{display:flex}
.dd-menu a{padding:9px 12px;border-radius:8px;font-size:14px;color:var(--ink-soft);white-space:nowrap}
.dd-menu a:hover{background:var(--bg-soft);color:var(--gold)}
.nav-search{width:38px;height:38px;border:1px solid var(--line);border-radius:11px;background:var(--panel);
  color:var(--gold);font-size:17px;cursor:pointer;flex-shrink:0;display:inline-flex;align-items:center;justify-content:center}
.nav-search:hover{border-color:var(--gold);box-shadow:0 6px 16px -6px rgba(217,154,43,.5)}
.nav-toggle{display:none;background:none;border:1px solid var(--line);border-radius:10px;width:42px;height:42px;font-size:22px;color:var(--ink);cursor:pointer;line-height:1}

/* ===== 按钮 ===== */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border-radius:12px;font-weight:600;
  padding:11px 20px;font-size:15px;border:1px solid transparent;cursor:pointer;transition:.18s}
.btn-primary{background:var(--grad);color:#fff;box-shadow:0 10px 26px -10px rgba(217,154,43,.7)}
.btn-primary:hover{transform:translateY(-1px);box-shadow:0 16px 34px -12px rgba(199,116,46,.6)}
.btn-ghost{background:var(--panel);color:var(--ink);border-color:var(--line)}
.btn-ghost:hover{border-color:var(--gold);color:var(--gold)}
.btn-outline{background:transparent;color:var(--gold);border-color:var(--gold)}
.btn-outline:hover{background:var(--grad-soft);color:var(--gold)}
.btn-lg{padding:14px 28px;font-size:16px;border-radius:14px}
.btn-sm{padding:9px 16px;font-size:14px}

/* ===== 分屏 hero(墨黑 + 光轨跃迁背景 + 左文右图) ===== */
.hero{position:relative;overflow:hidden;color:#fff;background:
  radial-gradient(1200px 640px at 50% -8%,#2c1f0a 0%,transparent 60%),
  linear-gradient(165deg,#16130e 0%,#231a0c 55%,#0f0c08 100%)}
.hero::before{content:"";position:absolute;left:50%;top:50%;width:1500px;height:1500px;
  transform:translate(-50%,-50%);background:
    repeating-radial-gradient(circle at center,rgba(217,154,43,.14) 0 58px,transparent 58px 118px);
  border-radius:50%;filter:blur(1px);animation:heroDrift 34s linear infinite;pointer-events:none}
.hero::after{content:"";position:absolute;inset:0;background:
  radial-gradient(900px 480px at 50% 38%,rgba(217,154,43,.22) 0%,transparent 60%);pointer-events:none}
.hero-blob{position:absolute;border-radius:50%;filter:blur(80px);opacity:.5;pointer-events:none}
.hero-blob.b1{width:420px;height:420px;left:-100px;top:30px;background:radial-gradient(circle,#d99a2b,transparent 70%);animation:float 16s ease-in-out infinite}
.hero-blob.b2{width:360px;height:360px;right:-80px;bottom:-40px;background:radial-gradient(circle,#f2b544,transparent 70%);animation:float 20s ease-in-out infinite reverse}
.hero .wrap{position:relative;z-index:3;padding:64px 24px 58px}
.hero-grid{display:grid;grid-template-columns:1.06fr .94fr;gap:48px;align-items:center}
.hero-copy{text-align:left}
.hero-kicker{display:inline-flex;align-items:center;gap:9px;font-family:var(--mono);font-size:12.5px;
  letter-spacing:.13em;color:#f6d9a0;background:rgba(217,154,43,.2);border:1px solid rgba(217,154,43,.42);
  padding:6px 14px;border-radius:999px;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px)}
.hero-kicker .dot{width:8px;height:8px;border-radius:50%;background:var(--grad);box-shadow:0 0 12px rgba(217,154,43,.9);animation:pulse 2s ease-in-out infinite}
.hero-title{font-size:clamp(32px,4.8vw,54px);font-weight:800;line-height:1.14;letter-spacing:-.02em;margin:22px 0 18px;color:#fff}
.hero-title .hl{background:linear-gradient(115deg,#f2b544,#d99a2b 50%,#fff4d6);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero-sub{color:rgba(255,255,255,.72);font-size:17px}
.hero-copy .hero-sub{max-width:520px;margin:0}
.hero-cta{display:flex;gap:14px;margin:30px 0 26px;flex-wrap:wrap}
.hero-copy .hero-cta{justify-content:flex-start}
.hero-badge-row{display:flex;gap:10px;flex-wrap:wrap;margin-top:10px}
.hero-copy .hero-badge-row{justify-content:flex-start}
.hero-badge{display:inline-flex;align-items:center;gap:8px;font-family:var(--mono);font-size:12.5px;
  letter-spacing:.03em;color:#f4eee2;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.16);
  padding:7px 15px;border-radius:999px;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px)}
.hero-badge b{color:#f6d9a0;font-weight:700}
.hero-visual{position:relative}
.hero-visual .warp{width:100%;height:auto;filter:drop-shadow(0 0 46px rgba(242,181,68,.22))}
.hero .btn-ghost{background:rgba(255,255,255,.1);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);color:#fff;border-color:rgba(255,255,255,.25)}
.hero .btn-ghost:hover{border-color:#fff;color:#fff;background:rgba(255,255,255,.18)}
@keyframes heroDrift{from{transform:translate(-50%,-50%) rotate(0deg)}to{transform:translate(-50%,-50%) rotate(360deg)}}
@keyframes float{0%,100%{transform:translate(0,0)}50%{transform:translate(30px,-30px)}}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.4}}

/* ===== 光轨数据带 marquee ===== */
.marquee{background:var(--deep);border-top:1px solid #2c261a;border-bottom:1px solid #2c261a;overflow:hidden;position:relative}
.marquee-track{display:flex;width:max-content;animation:marquee 36s linear infinite;padding:14px 0}
.marquee:hover .marquee-track{animation-play-state:paused}
.marquee-item{display:inline-flex;align-items:center;gap:14px;padding:0 26px;font-family:var(--mono);
  font-size:12.5px;letter-spacing:.14em;color:#cbb691;white-space:nowrap}
.marquee-item::before{content:"◆";color:var(--amber);font-size:9px}
@keyframes marquee{from{transform:translateX(0)}to{transform:translateX(-50%)}}

/* ===== 横向时间轴 timeline ===== */
.timeline{display:grid;grid-template-columns:repeat(4,1fr);gap:0;position:relative;max-width:1000px;margin:0 auto}
.timeline::before{content:"";position:absolute;left:12%;right:12%;top:26px;height:2px;
  background:linear-gradient(90deg,var(--amber),var(--gold),var(--copper));opacity:.35}
.tl-item{position:relative;text-align:center;padding:0 14px}
.tl-dot{width:52px;height:52px;border-radius:50%;background:var(--grad);color:#fff;font-weight:800;font-size:20px;
  display:flex;align-items:center;justify-content:center;margin:0 auto 16px;font-family:var(--mono);
  position:relative;z-index:2;box-shadow:0 10px 22px -8px rgba(217,154,43,.55)}
.tl-item h3{font-size:17px;font-weight:700;margin-bottom:6px;color:var(--ink)}
.tl-item p{font-size:14px;color:var(--muted)}

/* ===== SVG 招牌 ===== */
.warp,.orbit,.track{width:100%;height:auto;display:block}

/* ===== section / head / kicker ===== */
.section{padding:64px 0}
.section.alt{background:linear-gradient(180deg,var(--bg-soft) 0%,var(--bg) 100%);
  border-top:1px solid var(--line-soft);border-bottom:1px solid var(--line-soft)}
.sec-head{text-align:center;max-width:680px;margin:0 auto 36px}
.sec-head.left{text-align:left;margin-left:0}
.sec-head h2{font-size:30px;font-weight:800;letter-spacing:-.01em;margin:8px 0 10px;color:var(--ink)}
.sec-head p{color:var(--muted);font-size:16px}
.kicker{display:inline-block;font-family:var(--mono);font-size:11.5px;letter-spacing:.18em;color:var(--gold);
  text-transform:uppercase;background:rgba(217,154,43,.08);border:1px solid rgba(217,154,43,.22);padding:4px 11px;border-radius:7px}

/* ===== rel-grid / rel-card ===== */
.rel-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.rel-grid.single{grid-template-columns:repeat(4,1fr)}
.rel-card{display:block;background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:22px;
  box-shadow:var(--shadow);transition:.18s;position:relative;overflow:hidden}
.rel-card::before{content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:var(--grad);opacity:0;transition:.18s}
.rel-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:rgba(217,154,43,.4)}
.rel-card:hover::before{opacity:1}
.rel-card .tag{display:inline-block;font-family:var(--mono);font-size:11px;letter-spacing:.08em;color:var(--gold);
  background:rgba(217,154,43,.08);border:1px solid rgba(217,154,43,.2);padding:3px 9px;border-radius:6px;margin-bottom:12px}
.rel-card h4{font-size:17px;font-weight:700;margin-bottom:7px;color:var(--ink)}
.rel-card p{font-size:14px;color:var(--muted)}

/* ===== bento ===== */
.bento{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.bento-card{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:26px;box-shadow:var(--shadow);
  transition:.18s;position:relative;overflow:hidden}
.bento-card::after{content:"";position:absolute;right:-34px;top:-34px;width:96px;height:96px;border-radius:50%;
  background:radial-gradient(circle,rgba(217,154,43,.12),transparent 70%)}
.bento-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:rgba(217,154,43,.4)}
.bento-card .ic{font-size:30px;margin-bottom:14px;display:inline-block}
.bento-card h3{font-size:18px;font-weight:700;margin-bottom:8px;color:var(--ink)}
.bento-card p{font-size:14.5px;color:var(--muted)}

/* ===== 横向滚动场景卡 h-scroll ===== */
.h-scroll{display:flex;gap:18px;overflow-x:auto;padding:6px 2px 18px;scroll-snap-type:x mandatory;
  scrollbar-width:thin;scrollbar-color:var(--gold) var(--line)}
.h-scroll::-webkit-scrollbar{height:8px}
.h-scroll::-webkit-scrollbar-thumb{background:var(--grad);border-radius:4px}
.h-scroll::-webkit-scrollbar-track{background:var(--line-soft);border-radius:4px}
.h-card{flex:0 0 300px;scroll-snap-align:start;position:relative;border-radius:18px;overflow:hidden;
  box-shadow:var(--shadow);border:1px solid var(--line);background:var(--panel);transition:.2s}
.h-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}
.h-card img{aspect-ratio:16/10;object-fit:cover;width:100%}
.h-cap{padding:16px 18px 18px}
.h-cap .tag{display:inline-block;font-family:var(--mono);font-size:11px;letter-spacing:.08em;color:var(--gold);
  margin-bottom:8px}
.h-cap h4{font-size:17px;font-weight:700;margin-bottom:4px;color:var(--ink)}
.h-cap p{font-size:13.5px;color:var(--muted)}

/* ===== steps(竖排玻璃编号步骤) ===== */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;max-width:940px;margin:0 auto}
.step{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:24px;box-shadow:var(--shadow);position:relative}
.step .n{width:42px;height:42px;border-radius:50%;background:var(--grad);color:#fff;font-weight:800;font-size:17px;
  display:flex;align-items:center;justify-content:center;margin-bottom:16px;font-family:var(--mono)}
.step h3{font-size:17px;font-weight:700;margin-bottom:8px;color:var(--ink)}
.step p{font-size:14.5px;color:var(--muted)}
.step .b{line-height:1.6}

/* ===== 表格 ===== */
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow);background:var(--panel)}
table{width:100%;border-collapse:collapse;font-size:14.5px;min-width:520px}
thead th{background:var(--bg-deep);color:var(--copper);text-align:left;padding:13px 16px;font-weight:600;
  white-space:nowrap;font-family:var(--mono);letter-spacing:.04em}
thead th:first-child{border-radius:15px 0 0 0}
thead th:last-child{border-radius:0 15px 0 0}
tbody td{padding:13px 16px;border-top:1px solid var(--line-soft);color:var(--ink)}
tbody tr:nth-child(even){background:rgba(217,154,43,.03)}
tbody tr:hover{background:rgba(217,154,43,.06)}

/* ===== 提示 / 警示 / 引用 ===== */
.tip,.callout{border-radius:14px;padding:15px 18px;margin:20px 0;font-size:15px;position:relative;padding-left:48px}
.tip{background:rgba(242,181,68,.12);border:1px solid rgba(242,181,68,.35);color:#7a5a1e}
.tip::before{content:"ⓘ";position:absolute;left:16px;top:14px;font-weight:700;color:var(--amber);font-size:18px}
.callout{background:rgba(217,154,43,.08);border:1px solid rgba(217,154,43,.28);color:#7a4a18}
.callout::before{content:"!";position:absolute;left:19px;top:13px;font-weight:800;color:var(--gold);font-size:18px}
blockquote{border-left:3px solid var(--gold);background:var(--bg-soft);padding:14px 20px;border-radius:0 14px 14px 0;margin:20px 0;color:var(--ink);font-style:italic}

/* ===== FAQ ===== */
.faq-group{margin-bottom:18px}
.faq-group h2{font-size:20px;font-weight:700;margin-bottom:14px;color:var(--gold)}
.faq-group details{background:var(--panel);border:1px solid var(--line);border-radius:14px;margin-bottom:12px;box-shadow:var(--shadow);overflow:hidden}
.faq-group summary{cursor:pointer;padding:16px 20px;font-weight:600;font-size:15.5px;list-style:none;
  display:flex;justify-content:space-between;align-items:center;color:var(--ink)}
.faq-group summary::-webkit-details-marker{display:none}
.faq-group summary::after{content:"＋";font-family:var(--mono);color:var(--gold);font-weight:700;font-size:18px}
.faq-group details[open] summary::after{content:"－"}
.faq-a{padding:0 20px 18px;color:var(--muted);font-size:14.5px}

/* ===== CTA ===== */
.cta-band{background:var(--grad);border-radius:22px;padding:54px 42px;text-align:center;color:#fff;
  position:relative;overflow:hidden;box-shadow:var(--shadow-lg)}
.cta-band::before{content:"";position:absolute;inset:0;
  background-image:radial-gradient(rgba(255,255,255,.25) 1px,transparent 1px);background-size:26px 26px;opacity:.4}
.cta-band h2{font-size:30px;font-weight:800;margin-bottom:10px;position:relative}
.cta-band p{font-size:16px;opacity:.92;margin-bottom:24px;position:relative}
.cta-band .btn-ghost{position:relative;background:#fff;color:var(--gold);border:0;font-weight:700}
.cta-band .btn-ghost:hover{background:#fff9ee;color:var(--copper)}

/* ===== 页脚 mastfoot(墨黑曜金) ===== */
.mastfoot{background:var(--deep);color:#b8ab8e;border-top:1px solid #2c261a;position:relative;overflow:hidden}
.mastfoot::before{content:"";position:absolute;inset:0;
  background-image:radial-gradient(rgba(217,154,43,.07) 1px,transparent 1px);background-size:28px 28px;pointer-events:none}
.mastfoot .wrap{position:relative;padding:54px 24px 0}
.mf-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:34px;padding-bottom:38px}
.mf-brand p{font-size:14px;margin-top:14px;max-width:280px;line-height:1.8}
.mf-brand .wm-name{color:#fff}
.mf-brand .wm-sub{color:#8a7d5f}
.mf-col h4{color:#fff;font-size:13px;letter-spacing:.08em;text-transform:uppercase;margin-bottom:16px;font-family:var(--mono)}
.mf-col a{display:block;font-size:14px;padding:5px 0;color:#b8ab8e}
.mf-col a:hover{color:#f2b544}
.foot-line{border-top:1px solid #2c261a;padding:20px 0;text-align:center;font-family:var(--mono);font-size:12.5px;letter-spacing:.05em;color:#6a5f48}

/* ===== 面包屑 ===== */
.breadcrumb{font-size:13.5px;color:var(--muted);margin-bottom:16px}
.breadcrumb a{color:var(--gold)}
.breadcrumb a:hover{text-decoration:underline}
.breadcrumb .sep{margin:0 8px;color:#cdbd9d}

/* ===== page-hero ===== */
.page-hero{background:
  radial-gradient(760px 420px at 15% -20%,rgba(217,154,43,.13) 0%,transparent 60%),
  radial-gradient(700px 400px at 90% -10%,rgba(242,181,68,.12) 0%,transparent 60%),
  var(--bg);border-bottom:1px solid var(--line-soft);padding:50px 0 46px;position:relative;overflow:hidden}
.page-hero .wrap{position:relative}
.page-hero h1{font-size:36px;font-weight:800;letter-spacing:-.01em;margin-bottom:12px;color:var(--ink)}
.page-hero p{color:var(--muted);font-size:16.5px;max-width:720px}

/* ===== 左右图文 split ===== */
.split{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center}
.split.rev>div:first-child{order:2}
.split h2{font-size:26px;font-weight:800;margin-bottom:14px;color:var(--ink)}
.split p{color:var(--muted);margin-bottom:14px}
.split ul{color:var(--muted);margin-bottom:16px}
.split ul li{margin-bottom:8px}
.split .img{border-radius:18px;overflow:hidden;box-shadow:var(--shadow-lg);position:relative}
.split .img img{aspect-ratio:4/3;object-fit:cover;width:100%}

/* ===== 文章页 ===== */
.article-hero{background:
  radial-gradient(760px 420px at 15% -20%,rgba(217,154,43,.12) 0%,transparent 60%),
  radial-gradient(700px 400px at 90% -10%,rgba(242,181,68,.11) 0%,transparent 60%),
  var(--bg);border-bottom:1px solid var(--line-soft);padding:44px 0 40px;position:relative;overflow:hidden}
.article-hero .wrap{position:relative}
.article-hero h1{font-size:34px;font-weight:800;letter-spacing:-.01em;margin-bottom:12px;line-height:1.3;color:var(--ink)}
.article-hero p{color:var(--muted);max-width:720px}
.article-meta{display:flex;gap:20px;margin-top:16px;font-size:13px;color:var(--muted);font-family:var(--mono)}
.article-body{padding:44px 0 70px}
.article-layout{display:grid;grid-template-columns:240px 1fr;gap:44px;max-width:1080px;margin:0 auto;padding:0 24px}
.toc{position:sticky;top:90px;align-self:start;background:var(--panel);border:1px solid var(--line);border-radius:16px;
  padding:18px;box-shadow:var(--shadow)}
.toc h4{font-family:var(--mono);font-size:12px;letter-spacing:.12em;color:var(--gold);text-transform:uppercase;margin-bottom:12px}
.toc a{display:block;font-size:14px;color:var(--muted);padding:6px 0;border-left:2px solid transparent;padding-left:12px}
.toc a:hover{color:var(--gold);border-left-color:var(--gold)}
.prose{font-size:16.5px;line-height:1.9;color:var(--ink-soft)}
.prose h2{font-size:24px;font-weight:800;margin:36px 0 14px;padding-top:14px;color:var(--copper)}
.prose p{margin-bottom:16px}
.prose ul,.prose ol{margin-bottom:16px}
.prose li{margin-bottom:8px}
.prose figure{margin:26px 0}
.prose figure img{border-radius:16px;border:1px solid var(--line);box-shadow:var(--shadow)}
.prose figcaption{font-size:13px;color:var(--muted);text-align:center;margin-top:10px}
.prose a{color:var(--gold);border-bottom:1px solid rgba(217,154,43,.3)}
.prose a:hover{color:var(--copper)}

/* ===== 分享 ===== */
.share{display:flex;gap:10px;margin-top:36px;padding-top:22px;border-top:1px solid var(--line);flex-wrap:wrap}
.share a{font-size:13px;font-weight:600;color:var(--gold);border:1px solid var(--line);border-radius:10px;
  padding:8px 14px;background:var(--panel);transition:.15s}
.share a:hover{border-color:var(--gold);background:var(--grad-soft)}

/* ===== center-hero / search-box / sitemap ===== */
.center-hero{min-height:55vh;display:flex;align-items:center;justify-content:center;text-align:center;padding:60px 24px;position:relative}
.center-hero h1{font-size:72px;font-weight:800;background:var(--grad-text);-webkit-background-clip:text;
  background-clip:text;color:transparent;line-height:1}
.center-hero p{color:var(--muted);margin:18px 0 26px}
.search-box{display:flex;gap:10px;max-width:520px;margin:0 auto}
.search-box input{flex:1;padding:12px 16px;border:1px solid var(--line);border-radius:12px;font-size:15px;
  font-family:inherit;background:var(--panel);color:var(--ink)}
.search-box input:focus{outline:none;border-color:var(--gold);box-shadow:0 0 0 3px rgba(217,154,43,.15)}
.sitemap-list h2{font-size:20px;font-weight:700;margin:30px 0 12px;color:var(--gold);border-bottom:2px solid var(--line);padding-bottom:8px}
.sitemap-list>div{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}
.sitemap-list a{font-size:14px;color:var(--ink-soft);padding:4px 0;display:block}
.sitemap-list a:hover{color:var(--gold);text-decoration:underline}

/* ===== 返回顶部 ===== */
.backtop{position:fixed;right:22px;bottom:24px;width:46px;height:46px;border-radius:14px;background:var(--grad);
  color:#fff;font-size:20px;border:0;cursor:pointer;box-shadow:var(--shadow-lg);opacity:0;visibility:hidden;
  transform:translateY(10px);transition:.25s;z-index:90}
.backtop.show{opacity:1;visibility:visible;transform:translateY(0)}
.backtop:hover{transform:translateY(-2px)}

/* ===== 滚动渐显 ===== */
.reveal{opacity:0;transform:translateY(22px);transition:opacity .6s ease,transform .6s ease}
.reveal.in{opacity:1;transform:none}

/* ===== 响应式 ===== */
@media (max-width:980px){
  .timeline{grid-template-columns:1fr 1fr;gap:26px}
  .timeline::before{display:none}
  .rel-grid,.bento{grid-template-columns:repeat(2,1fr)}
  .rel-grid.single{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:1fr;max-width:460px}
  .mf-grid{grid-template-columns:1fr 1fr}
  .split{grid-template-columns:1fr;gap:28px}
  .split.rev>div:first-child{order:0}
  .hero-grid{grid-template-columns:1fr;gap:36px}
  .hero-visual{max-width:560px;margin:0 auto}
  .article-layout{grid-template-columns:1fr}
  .toc{position:static;display:none}
  .sitemap-list>div{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:680px){
  .nav-row{justify-content:space-between;flex-wrap:wrap}
  .nav-wrap>a,.nav-wrap .dd{display:none}
  .nav-wrap.open>a,.nav-wrap.open .dd{display:block}
  .nav-wrap{flex-direction:column;align-items:stretch;width:100%}
  .nav-wrap.open{display:flex}
  .nav-wrap.open .dd-menu{position:static;display:flex;box-shadow:none;border:0;padding:0 0 0 12px;transform:none;background:transparent}
  .nav-toggle{display:block;margin-left:auto}
  .timeline{grid-template-columns:1fr}
  .rel-grid,.bento,.rel-grid.single{grid-template-columns:1fr}
  .mf-grid{grid-template-columns:1fr}
  .sitemap-list>div{grid-template-columns:1fr}
  .hero-cta .btn{width:100%}
  .cta-band{padding:40px 22px}
  .cta-band h2{font-size:24px}
}

/* ===== 顶部状态条 topbar ===== */
.topbar{position:relative;z-index:60;background:linear-gradient(90deg,#2a1a05,#b45309 55%,#d99a2b);color:#fff;font-size:13px;text-align:center;padding:7px 16px;letter-spacing:.4px;font-weight:500}
.topbar .tb-sep{opacity:.5;margin:0 9px}