/* ============ 跟卖大师学院 · NEON GLASS 霓虹玻璃风 ============ */
:root{
  --bg:#f4f3ff;
  --bg-2:#eef4ff;
  --panel:rgba(255,255,255,.62);   /* 玻璃面板 */
  --panel-solid:#ffffff;
  --line:rgba(124,58,237,.18);
  --line-2:rgba(124,58,237,.09);
  --txt:#1b1733;
  --dim:#5a5470;
  --faint:#928ca8;
  --brand:#7c3aed;          /* 霓虹紫 */
  --brand-2:#06b6d4;        /* 霓虹青 */
  --brand-3:#ec4899;        /* 霓虹粉 */
  --brand-soft:rgba(124,58,237,.10);
  --cyan-soft:rgba(6,182,212,.12);
  --pink-soft:rgba(236,72,153,.10);
  --ok:#10b981; --ok-soft:rgba(16,185,129,.12);
  --gold:#f59e0b; --gold-soft:rgba(245,158,11,.12);
  --danger:#f43f5e; --danger-soft:rgba(244,63,94,.10);
  --radius:16px;
  --shadow:0 8px 30px rgba(124,58,237,.10);
  --shadow-h:0 16px 48px rgba(124,58,237,.24);
  --neon:0 0 0 1px rgba(124,58,237,.22), 0 8px 30px rgba(124,58,237,.18);
  --neon-cyan:0 0 0 1px rgba(6,182,212,.30), 0 8px 30px rgba(6,182,212,.20);
  --maxw:1140px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%}
body{
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",Segoe UI,Roboto,sans-serif;
  color:var(--txt);line-height:1.7;font-size:15px;-webkit-font-smoothing:antialiased;
  background:
    radial-gradient(1100px 520px at 90% -8%, rgba(6,182,212,.16), transparent 60%),
    radial-gradient(900px 460px at 0% 8%, rgba(124,58,237,.18), transparent 58%),
    radial-gradient(700px 420px at 55% 110%, rgba(236,72,153,.14), transparent 60%),
    linear-gradient(160deg,var(--bg),var(--bg-2));
  background-attachment:fixed;min-height:100vh;position:relative}
/* 流动霓虹光晕 */
body::before,body::after{content:"";position:fixed;border-radius:50%;filter:blur(90px);opacity:.5;z-index:0;pointer-events:none}
body::before{width:460px;height:460px;top:-120px;right:-80px;
  background:radial-gradient(circle,#a855f7,transparent 65%);animation:float1 16s ease-in-out infinite}
body::after{width:420px;height:420px;bottom:-140px;left:-90px;
  background:radial-gradient(circle,#22d3ee,transparent 65%);animation:float2 19s ease-in-out infinite}
@keyframes float1{0%,100%{transform:translate(0,0)}50%{transform:translate(-40px,40px)}}
@keyframes float2{0%,100%{transform:translate(0,0)}50%{transform:translate(50px,-30px)}}
a{color:inherit;text-decoration:none}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 22px;position:relative;z-index:1}
.grad{background:linear-gradient(100deg,var(--brand),var(--brand-2) 55%,var(--brand-3));
  -webkit-background-clip:text;background-clip:text;color:transparent;
  text-shadow:0 0 24px rgba(124,58,237,.25)}
.sub{color:var(--dim)}
.btn{display:inline-flex;align-items:center;gap:6px;padding:11px 20px;border-radius:11px;font-weight:600;font-size:14.5px;transition:.2s;cursor:pointer;position:relative}
.btn-primary{background:linear-gradient(100deg,var(--brand),var(--brand-2));color:#fff;
  box-shadow:0 8px 22px rgba(124,58,237,.38), 0 0 0 1px rgba(255,255,255,.18) inset}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 30px rgba(124,58,237,.5), 0 0 22px rgba(124,58,237,.45)}
.btn-ghost{background:rgba(255,255,255,.55);color:var(--brand);border:1px solid var(--line);backdrop-filter:blur(8px)}
.btn-ghost:hover{border-color:var(--brand);background:var(--brand-soft);box-shadow:var(--neon)}

/* 顶栏（兼容旧 .nav） */
.topnav,.nav{position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,.62);backdrop-filter:saturate(180%) blur(14px);
  border-bottom:1px solid var(--line)}
.topnav .wrap,.nav-inner{max-width:var(--maxw);margin:0 auto;padding:0 22px;display:flex;align-items:center;height:62px;gap:26px}
.logo{display:flex;align-items:center;gap:9px;font-weight:800;font-size:17px;letter-spacing:.3px;white-space:nowrap}
.logo .mark{width:30px;height:30px;border-radius:9px;
  background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;display:grid;place-items:center;font-size:16px;
  box-shadow:0 4px 14px rgba(124,58,237,.45), 0 0 16px rgba(6,182,212,.4)}
.navlinks,.nav-links{display:flex;gap:4px;flex:1;flex-wrap:wrap}
.navlinks a,.nav-links a{padding:8px 13px;border-radius:9px;font-size:14px;color:var(--dim);font-weight:500;transition:.15s;white-space:nowrap}
.navlinks a:hover,.nav-links a:hover{color:var(--brand);background:var(--brand-soft);box-shadow:var(--neon)}
.navlinks a.on,.nav-links a.on{color:#fff;background:linear-gradient(100deg,var(--brand),var(--brand-2));box-shadow:0 6px 16px rgba(124,58,237,.4)}
.nav-cta{margin-left:auto;padding:9px 18px;border-radius:11px;
  background:linear-gradient(100deg,var(--brand),var(--brand-3));color:#fff;font-weight:700;font-size:14px;
  box-shadow:0 8px 20px rgba(236,72,153,.38), 0 0 18px rgba(124,58,237,.3);white-space:nowrap}
.nav-cta:hover{transform:translateY(-1px);box-shadow:0 12px 26px rgba(236,72,153,.5), 0 0 26px rgba(124,58,237,.45)}

/* Hero */
.hero{padding:54px 0 42px;position:relative}
.hero .wrap,.hero-inner{max-width:var(--maxw);margin:0 auto;padding:0 22px;position:relative;z-index:1}
.hero h1{font-size:38px;line-height:1.25;margin:16px 0 14px;font-weight:800;letter-spacing:-.5px}
.hero .sub{font-size:16px;color:var(--dim);max-width:700px}
.hero .sub b{color:var(--txt)}
.badge{display:inline-flex;align-items:center;gap:7px;font-size:12.5px;font-weight:600;color:var(--brand);
  background:rgba(255,255,255,.7);border:1px solid var(--line);padding:5px 13px;border-radius:999px;
  box-shadow:var(--shadow);backdrop-filter:blur(8px)}
.badge.g{color:var(--brand)} .badge.b{color:var(--brand-2)} .badge.w{color:var(--gold);background:var(--gold-soft);border-color:transparent}
.dot{width:7px;height:7px;border-radius:50%;background:var(--ok);box-shadow:0 0 0 3px var(--ok-soft), 0 0 10px var(--ok)}
.hero-cta{display:flex;gap:13px;margin-top:22px;flex-wrap:wrap}
.stats{display:flex;gap:32px;margin-top:32px;flex-wrap:wrap}
.stat b{font-size:25px;font-weight:800;color:var(--txt);display:block;line-height:1.1;
  background:linear-gradient(100deg,var(--brand),var(--brand-2));-webkit-background-clip:text;background-clip:text;color:transparent}
.stat span{font-size:13px;color:var(--faint)}

/* 区块 */
.sec{padding:44px 0 8px;position:relative;z-index:1}
.sec-head{display:flex;align-items:flex-end;justify-content:space-between;margin-bottom:22px;gap:16px;flex-wrap:wrap}
.sec-head h2{font-size:23px;font-weight:800;letter-spacing:-.3px}
.sec-head .note{font-size:13.5px;color:var(--faint)}

/* 两条主线 */
.tracks{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.track{display:block;background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:24px;
  box-shadow:var(--shadow);transition:.2s;position:relative;overflow:hidden;backdrop-filter:blur(10px)}
.track::before{content:"";position:absolute;inset:0;border-radius:var(--radius);padding:1px;
  background:linear-gradient(120deg,rgba(124,58,237,.5),rgba(6,182,212,.4),transparent);
  -webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);-webkit-mask-composite:xor;mask-composite:exclude;opacity:0;transition:.2s}
.track:hover{transform:translateY(-3px);box-shadow:var(--shadow-h);border-color:transparent}
.track:hover::before{opacity:1}
.track .tk-top{display:flex;align-items:center;gap:12px;margin-bottom:6px}
.track .tk-ico{width:46px;height:46px;border-radius:12px;display:grid;place-items:center;font-size:22px;
  background:linear-gradient(135deg,var(--brand-soft),var(--cyan-soft));color:var(--brand);box-shadow:var(--neon)}
.track.ozon .tk-ico{background:linear-gradient(135deg,var(--cyan-soft),var(--pink-soft));color:var(--brand-2)}
.track h3{font-size:19px;font-weight:800}
.track .tk-meta{font-size:13px;color:var(--faint);margin:8px 0 14px}
.track .tk-steps{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:14px}
.track .tk-steps span{font-size:12.5px;background:rgba(255,255,255,.7);color:var(--dim);padding:5px 11px;border-radius:8px;border:1px solid var(--line)}
.track .tk-go{font-weight:700;color:var(--brand);font-size:14.5px}
.track .tk-go span{transition:.18s;display:inline-block}
.track:hover .tk-go span{transform:translateX(4px)}

/* 课程网格 */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(270px,1fr));gap:16px}
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:20px;
  box-shadow:var(--shadow);transition:.2s;display:flex;flex-direction:column;gap:9px;position:relative;overflow:hidden;backdrop-filter:blur(10px)}
.card::before{content:"";position:absolute;inset:0;border-radius:var(--radius);padding:1px;
  background:linear-gradient(120deg,rgba(236,72,153,.5),rgba(124,58,237,.4),transparent);
  -webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);-webkit-mask-composite:xor;mask-composite:exclude;opacity:0;transition:.2s}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow-h);border-color:transparent}
.card:hover::before{opacity:1}
.card .c-ico{width:42px;height:42px;border-radius:11px;display:grid;place-items:center;font-size:20px;
  background:linear-gradient(135deg,var(--brand-soft),var(--pink-soft));color:var(--brand);box-shadow:var(--neon)}
.card h3{font-size:16.5px;font-weight:800;margin-top:2px}
.card p{font-size:13.5px;color:var(--dim);flex:1}
.card .c-foot{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-top:4px}
.card .c-go{margin-left:auto;font-size:13.5px;font-weight:700;color:var(--brand)}
.card .c-go span{transition:.18s;display:inline-block}
.card:hover .c-go span{transform:translateX(4px)}
.card .tagrow{display:flex;gap:6px;flex-wrap:wrap}
.pill{display:inline-flex;align-items:center;gap:5px;font-size:12px;font-weight:600;padding:3px 10px;border-radius:999px;white-space:nowrap;border:1px solid transparent}
.pill-core{background:var(--brand-soft);color:var(--brand);border-color:rgba(124,58,237,.18)}
.pill-ext{background:var(--gold-soft);color:var(--gold);border-color:rgba(245,158,11,.18)}
.pill-free{background:var(--ok-soft);color:var(--ok);border-color:rgba(16,185,129,.18)}

/* 购买专区 · 霓虹渐变带（保持亮色基底，不再用深色） */
.buy{margin:52px 0 10px;border-radius:18px;padding:38px;color:#fff;display:flex;align-items:center;justify-content:space-between;gap:26px;flex-wrap:wrap;
  background:linear-gradient(120deg,#7c3aed,#4f46e5 45%,#ec4899);
  box-shadow:0 18px 48px rgba(124,58,237,.35), 0 0 40px rgba(236,72,153,.25);position:relative;overflow:hidden}
.buy::after{content:"";position:absolute;inset:0;background:
  radial-gradient(400px 200px at 12% 120%, rgba(6,182,212,.5), transparent 60%),
  radial-gradient(360px 200px at 95% -20%, rgba(255,255,255,.25), transparent 60%);pointer-events:none}
.buy>*{position:relative;z-index:1}
.buy h2{font-size:23px;font-weight:800;margin-bottom:8px}
.buy p{color:rgba(255,255,255,.9);font-size:14.5px;max-width:560px}
.buy .btn-primary{background:#fff;color:var(--brand);box-shadow:0 10px 26px rgba(0,0,0,.22), 0 0 20px rgba(255,255,255,.4)}
.buy .btn-primary:hover{background:#f4f1ff;box-shadow:0 14px 32px rgba(0,0,0,.28), 0 0 28px rgba(255,255,255,.6)}
.buy .btn-ghost{background:rgba(255,255,255,.14);color:#fff;border:1px solid rgba(255,255,255,.5);backdrop-filter:blur(6px)}
.buy .btn-ghost:hover{border-color:#fff;background:rgba(255,255,255,.24);box-shadow:0 0 22px rgba(255,255,255,.4)}

/* 信任条 */
.trust{display:flex;gap:14px;flex-wrap:wrap;margin:28px 0 8px}
.trust .t{flex:1;min-width:200px;background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:18px 20px;box-shadow:var(--shadow);backdrop-filter:blur(10px)}
.trust .t b{font-size:17px;display:block;margin-bottom:3px;background:linear-gradient(100deg,var(--brand),var(--brand-2));-webkit-background-clip:text;background-clip:text;color:transparent}
.trust .t span{font-size:13px;color:var(--faint)}

/* 面包屑 */
.crumb{font-size:13px;color:var(--faint);padding:18px 0 0;position:relative;z-index:1}
.crumb a{color:var(--brand)}

/* 内容页 lesson */
.lesson{max-width:860px;margin:26px auto 0;background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);
  padding:24px 26px;box-shadow:var(--shadow);backdrop-filter:blur(10px);position:relative;z-index:1}
.lesson h3{font-size:19px;font-weight:800;margin:6px 0 10px;display:flex;align-items:center;gap:10px}
.lesson .idx{width:26px;height:26px;border-radius:8px;background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;
  display:grid;place-items:center;font-size:14px;font-weight:800;flex:none;box-shadow:0 4px 12px rgba(124,58,237,.4)}
.lesson .lead{color:var(--dim);margin-bottom:12px}
.lesson h4{font-size:15.5px;font-weight:700;margin:16px 0 8px;color:var(--brand)}
.lesson ul,.lesson ol{padding-left:22px;color:var(--dim)}
.lesson li{margin:5px 0}
.lesson b{color:var(--txt)}
.tbl{width:100%;border-collapse:collapse;margin:14px 0;font-size:13.5px;overflow:hidden;border-radius:10px}
.tbl th{background:var(--brand-soft);color:var(--brand);text-align:left;padding:10px 12px;font-weight:700}
.tbl td{border-top:1px solid var(--line);padding:9px 12px;color:var(--dim)}
.tbl tr:nth-child(even) td{background:rgba(255,255,255,.5)}
.tbl .good{color:var(--ok);font-weight:600}
.tbl .bad{color:var(--danger);font-weight:600}
.panel{background:rgba(255,255,255,.6);border:1px solid var(--line);border-radius:12px;padding:16px 18px;margin:10px 0;box-shadow:var(--shadow)}
.tip{background:var(--ok-soft);border-left:3px solid var(--ok);padding:12px 16px;border-radius:8px;color:#0f7a4a;font-size:14px;margin:14px 0}
.warn{background:var(--gold-soft);border-left:3px solid var(--gold);padding:12px 16px;border-radius:8px;color:#92640c;font-size:14px;margin:14px 0}
.danger-box{background:var(--danger-soft);border-left:3px solid var(--danger);padding:12px 16px;border-radius:8px;color:#b81c34;font-size:14px;margin:14px 0}
.kbd{display:inline-block;background:#fff;border:1px solid var(--line);border-bottom-width:2px;border-radius:6px;padding:1px 8px;font-size:12.5px;font-weight:600;color:var(--brand);box-shadow:var(--neon)}

/* 视频 */
.video-box{max-width:860px;margin:14px auto 0;position:relative;z-index:1}
.video-box video{width:100%;border-radius:12px;background:#0b1020;display:block;border:1px solid var(--line);box-shadow:var(--shadow)}
.video-box .cap{font-size:13px;color:var(--faint);margin-top:8px;padding-left:2px}
.lesson .video-box{margin-left:0;margin-right:0}

/* 词典 */
.search-box{display:block;width:100%;max-width:860px;margin:18px auto;padding:12px 16px;border:1px solid var(--line);
  border-radius:12px;font-size:14.5px;background:rgba(255,255,255,.7);box-shadow:var(--shadow);outline:none;backdrop-filter:blur(8px)}
.search-box:focus{border-color:var(--brand);box-shadow:var(--neon-cyan)}
.modnav{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:20px 0}
.modnav a{display:block;background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:20px;
  box-shadow:var(--shadow);transition:.2s;position:relative;overflow:hidden;backdrop-filter:blur(10px)}
.modnav a::before{content:"";position:absolute;inset:0;border-radius:var(--radius);padding:1px;
  background:linear-gradient(120deg,rgba(6,182,212,.5),rgba(124,58,237,.4),transparent);
  -webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);-webkit-mask-composite:xor;mask-composite:exclude;opacity:0;transition:.2s}
.modnav a:hover{transform:translateY(-3px);box-shadow:var(--shadow-h);border-color:transparent}
.modnav a:hover::before{opacity:1}
.modnav .mwatermark{position:absolute;right:14px;top:6px;font-size:46px;font-weight:800;color:rgba(124,58,237,.10)}
.modnav h3{font-size:17px;font-weight:800;margin:6px 0}
.modnav p{font-size:13px;color:var(--dim)}
.modnav .mnum{font-size:12px;font-weight:700;color:var(--brand)}
.modnav .mcount{display:inline-block;margin-top:10px;font-size:13px;font-weight:700;color:var(--brand)}
.mod{margin-top:18px}
.mod-head{display:flex;align-items:center;gap:12px;margin-bottom:14px;position:relative}
.mod-head .mtag{font-size:12px;font-weight:700;color:var(--brand);background:var(--brand-soft);padding:4px 11px;border-radius:999px;border:1px solid rgba(124,58,237,.18)}
.mod-head .mw{margin-left:auto;font-size:40px;font-weight:800;color:rgba(124,58,237,.08)}
.mod-head h2{font-size:20px;font-weight:800}
.terms{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:12px}
.term{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:16px 18px;box-shadow:var(--shadow);backdrop-filter:blur(10px)}
.term b{font-size:15.5px}
.term .en{display:block;font-size:12px;color:var(--faint);margin-bottom:4px}
.term p{font-size:13.5px;color:var(--dim);margin-top:6px}
.term .tip{margin:10px 0 0;font-size:13px}

/* 启动步骤（首页三步） */
.guide{max-width:860px;margin:22px auto 0;background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow);backdrop-filter:blur(10px);position:relative;z-index:1}
.guide-tag{display:inline-block;font-size:12.5px;font-weight:700;color:var(--brand);background:var(--brand-soft);padding:4px 12px;border-radius:999px;border:1px solid rgba(124,58,237,.18)}
.guide h3{font-size:20px;font-weight:800;margin:12px 0 8px}
.guide p{color:var(--dim);font-size:14.5px}
.gsteps{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:18px}
.gstep{background:rgba(255,255,255,.6);border:1px solid var(--line);border-radius:12px;padding:16px}
.gstep .gs-n{width:28px;height:28px;border-radius:8px;background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;display:grid;place-items:center;font-weight:800;margin-bottom:8px;box-shadow:0 4px 12px rgba(124,58,237,.4)}
.gstep b{font-size:15px}
.gstep p{font-size:13px;color:var(--dim);margin:6px 0}
.gstep .gs-t{font-size:12.5px;color:var(--brand);font-weight:600}

/* footer */
footer{border-top:1px solid var(--line);margin-top:52px;padding:26px 0;color:var(--faint);font-size:13px;position:relative;z-index:1;
  background:rgba(255,255,255,.4);backdrop-filter:blur(8px)}
footer .wrap{display:flex;justify-content:space-between;gap:18px;flex-wrap:wrap}

@media (max-width:820px){
  .hero h1{font-size:28px}
  .tracks{grid-template-columns:1fr}
  .navlinks,.nav-links{display:none}
  .modnav{grid-template-columns:1fr}
  .gsteps{grid-template-columns:1fr}
  .buy{padding:26px}
  .lesson{padding:20px 18px}
}

/* ============================================================
   涌流 AI · SURGEFLOW AI 品牌层 v5（浅色科技风，签名色：青→紫→粉）
   ============================================================ */
:root{
  --sf-1:#06b6d4;   /* 涌流青 */
  --sf-2:#7c3aed;   /* 涌流紫 */
  --sf-3:#ec4899;   /* 涌流粉 */
  --sf-sig:linear-gradient(100deg,var(--sf-1),var(--sf-2) 55%,var(--sf-3));
}

/* 品牌 logo：脑图 SVG + 双行字标 */
.logo .mark{padding:0;overflow:hidden;font-size:0}
.logo .mark svg{width:100%;height:100%;display:block}
.logo .lg-txt{display:flex;flex-direction:column;line-height:1.08;font-size:17px}
.logo .lg-txt em{font-style:normal;font-size:8.5px;font-weight:700;letter-spacing:1.6px;
  color:var(--faint);margin-top:2px}

/* 顶栏一道签名渐变细线（科技感细节） */
.topnav,.nav{position:sticky;box-shadow:0 1px 0 rgba(124,58,237,.06)}
.topnav::before,.nav::before{content:"";position:absolute;left:0;right:0;top:0;height:2px;background:var(--sf-sig);opacity:.85}

/* Hero：英文 eyebrow + slogan + 网格底纹 + 流动虚线 */
.eyebrow{margin-top:16px;font-size:11.5px;font-weight:800;letter-spacing:3.4px;color:var(--faint)}
.slogan{display:inline-flex;align-items:center;gap:9px;margin:2px 0 12px;padding:6px 16px;border-radius:999px;
  border:1px solid var(--line);background:linear-gradient(100deg,rgba(6,182,212,.14),rgba(124,58,237,.13) 55%,rgba(236,72,153,.11));
  font-size:15px;font-weight:800;letter-spacing:1.5px;box-shadow:var(--shadow)}
.slogan span{background:var(--sf-sig);-webkit-background-clip:text;background-clip:text;color:transparent}
.slogan i{font-style:normal;color:var(--faint);font-weight:600}
.hero{isolation:isolate}
.hero::before{content:"";position:absolute;inset:0;z-index:-1;pointer-events:none;
  background-image:linear-gradient(rgba(124,58,237,.07) 1px,transparent 1px),
                   linear-gradient(90deg,rgba(124,58,237,.07) 1px,transparent 1px);
  background-size:34px 34px;
  -webkit-mask-image:radial-gradient(720px 320px at 20% 0%,#000,transparent 72%);
  mask-image:radial-gradient(720px 320px at 20% 0%,#000,transparent 72%)}
.hero-flow{position:absolute;inset:0;z-index:-1;pointer-events:none;opacity:.55;
  -webkit-mask-image:linear-gradient(180deg,#000,transparent 78%);
  mask-image:linear-gradient(180deg,#000,transparent 78%)}
.hero-flow path{fill:none;stroke-width:1.6;stroke-linecap:round;stroke-dasharray:7 12;
  animation:sfFlow 5.5s linear infinite}
@keyframes sfFlow{to{stroke-dashoffset:-76}}
@media (prefers-reduced-motion:reduce){.hero-flow path{animation:none}}

/* 签名渐变统一到「青→紫→粉」 */
.grad{background:var(--sf-sig);text-shadow:0 0 24px rgba(6,182,212,.22)}
.btn-primary{background:var(--sf-sig);box-shadow:0 8px 22px rgba(124,58,237,.34),0 0 0 1px rgba(255,255,255,.18) inset}
.btn-primary:hover{box-shadow:0 12px 30px rgba(124,58,237,.45),0 0 22px rgba(6,182,212,.4)}
.nav-cta{background:var(--sf-sig);box-shadow:0 8px 20px rgba(124,58,237,.34),0 0 18px rgba(6,182,212,.28)}
.pill-core{background:var(--sf-sig);color:#fff}
.gstep .gs-n{background:var(--sf-sig)}

/* 移动端：品牌块不挤导航 */
@media (max-width:820px){
  .slogan{font-size:13.5px;padding:5px 13px}
  .eyebrow{letter-spacing:2.4px;font-size:10.5px}
  .logo .lg-txt{font-size:15.5px}
}

/* ============================================================
   涌流 AI · 科技感 / 代码感层 v6（浅色底 + 等宽字 + 终端控制台）
   ============================================================ */
:root{
  --sf-mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Liberation Mono","Courier New",monospace;
}

/* ---- Hero 变两栏：左文案 / 右终端 ---- */
.hero-grid{display:grid;grid-template-columns:1.06fr .94fr;gap:38px;align-items:center}
.hero-txt{min-width:0}
@media (max-width:980px){
  .hero-grid{grid-template-columns:1fr;gap:26px}
}

/* ---- 终端控制台 ---- */
.term{border-radius:14px;overflow:hidden;border:1px solid rgba(124,58,237,.22);
  background:linear-gradient(180deg,rgba(255,255,255,.86),rgba(255,255,255,.72));
  box-shadow:0 18px 46px rgba(124,58,237,.16),0 0 0 1px rgba(255,255,255,.7) inset;
  backdrop-filter:blur(10px);position:relative}
.term::after{content:"";position:absolute;inset:0;pointer-events:none;border-radius:14px;
  background:repeating-linear-gradient(180deg,rgba(124,58,237,.045) 0 1px,transparent 1px 3px);
  mix-blend-mode:multiply;opacity:.7}
.term-bar{display:flex;align-items:center;gap:10px;padding:9px 13px;
  background:linear-gradient(100deg,rgba(6,182,212,.16),rgba(124,58,237,.16) 55%,rgba(236,72,153,.14));
  border-bottom:1px solid var(--line-2)}
.tdots{display:flex;gap:5px}
.tdots i{width:9px;height:9px;border-radius:50%;display:block}
.tdots i:nth-child(1){background:#f43f5e}.tdots i:nth-child(2){background:#f59e0b}.tdots i:nth-child(3){background:#10b981}
.tname{font:600 11.5px/1 var(--sf-mono);letter-spacing:.6px;color:var(--dim)}
.term-body{padding:15px 16px 12px;font:500 12.8px/1.95 var(--sf-mono);color:var(--txt);letter-spacing:.2px}
.term-body p{margin:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.term-body .pr{color:var(--sf-2);font-weight:700;margin-right:6px}
.term-body .ok{color:#0f9d76;padding-left:2px}
.term-body .dim{color:var(--faint)}
.cur{display:inline-block;width:8px;height:14px;margin-left:4px;vertical-align:-2px;
  background:var(--sf-sig);box-shadow:0 0 10px rgba(6,182,212,.6);animation:sfBlink 1.05s steps(1) infinite}
@keyframes sfBlink{50%{opacity:0}}
.term-foot{display:flex;gap:7px;padding:9px 13px;border-top:1px solid var(--line-2);
  font:600 10.5px/1 var(--sf-mono);letter-spacing:.8px;color:var(--faint)}
.term-foot span{padding:4px 8px;border-radius:6px;background:rgba(255,255,255,.75);border:1px solid var(--line-2)}
.term-foot .on{color:#0f9d76;border-color:rgba(16,185,129,.28)}
@media (max-width:420px){.term-body{font-size:11.6px}}

/* ---- 代码感排版：区块编号 // 01 ---- */
main{counter-reset:sfsec}
.sec-head h2{counter-increment:sfsec;display:flex;align-items:baseline;gap:10px;flex-wrap:wrap}
.sec-head h2::before{content:"// " counter(sfsec,decimal-leading-zero);
  font:700 12.5px/1 var(--sf-mono);letter-spacing:1px;
  background:var(--sf-sig);-webkit-background-clip:text;background-clip:text;color:transparent;opacity:.9}

/* ---- 卡片编号 + 悬停扫描线 ---- */
.grid{counter-reset:sfcard}
.card{counter-increment:sfcard}
.card::after{content:"[" counter(sfcard,decimal-leading-zero) "]";
  position:absolute;top:13px;right:15px;font:600 10.5px/1 var(--sf-mono);letter-spacing:.6px;
  color:var(--faint);opacity:.55;transition:.2s}
.card:hover::after{opacity:1;color:var(--sf-2)}
.card .c-ico{position:relative;overflow:hidden}
.card:hover .c-ico::after{content:"";position:absolute;inset:0;
  background:linear-gradient(100deg,transparent 20%,rgba(255,255,255,.85) 50%,transparent 80%);
  transform:translateX(-100%);animation:sfScan .75s ease}
@keyframes sfScan{to{transform:translateX(100%)}}

/* ---- 等宽小标签（tagrow / pill / note）---- */
.tagrow,.pill,.badge,.eyebrow,.stat span,.sec-head .note,.term-foot,.note{font-family:var(--sf-mono)}

/* ---- 按钮代码感：箭头前缀 ---- */
.btn-primary::before{content:"›";font-family:var(--sf-mono);font-weight:700;opacity:.9}

/* ---- 统计数字用等宽字，工程感 ---- */
.stat b{font-family:var(--sf-mono);letter-spacing:-1px}

/* ---- 选中态/焦点可见性（键盘可达）---- */
a:focus-visible,button:focus-visible{outline:2px solid var(--sf-2);outline-offset:3px;border-radius:8px}

/* ============================================================
   涌流 AI · 响应式兼容层 v7（手机操作 + 电脑可视性）
   原则：手机导航绝不隐藏 → 改为可横滑标签栏；触控区 ≥40px；
        桌面保留两栏与留白；所有断点只追加、不回头改基础层
   ============================================================ */

/* ---- 手机导航：横滑标签（修掉「手机点不到其他页」的坑）---- */
@media (max-width:820px){
  .topnav .wrap{flex-wrap:wrap;height:auto;padding-top:10px;padding-bottom:10px;gap:10px 12px}
  .logo{font-size:16px}
  .nav-cta{margin-left:auto;order:2}
  .navlinks,.nav-links{display:flex !important;order:3;flex:1 1 100%;flex-wrap:nowrap;
    overflow-x:auto;gap:5px;-webkit-overflow-scrolling:touch;scrollbar-width:none;
    margin:0 -22px;padding:2px 22px 4px}
  .navlinks::-webkit-scrollbar,.nav-links::-webkit-scrollbar{display:none}
  .navlinks a,.nav-links a{flex:0 0 auto;white-space:nowrap;padding:10px 14px;font-size:14px}
  .hero-grid{gap:24px}
}

/* ---- 中小屏：触控与字号 ---- */
@media (max-width:640px){
  body{font-size:14.5px}
  .hero{padding:34px 0 28px}
  .hero h1{font-size:25px}
  .hero .sub{font-size:14.5px;max-width:100%}
  .stats{gap:18px;margin-top:24px}
  .stat b{font-size:24px}
  .slogan{font-size:13px;padding:5px 12px}
  .eyebrow{letter-spacing:2.2px;font-size:10px}
  .card{padding:16px}
  .card h3{font-size:15.5px}
  .btn{font-size:14px}
  .buy{padding:24px}
  .buy .btn{width:100%;justify-content:center}
  .lesson,.video-box,.search-box,.guide{padding:18px;margin:16px auto 0}
  .sec{padding:34px 0 6px}
  .sec-head h2{font-size:20px}
}

/* ---- 极小屏（360~400）---- */
@media (max-width:400px){
  .hero h1{font-size:22px}
  .stat b{font-size:21px}
  .stats{gap:14px}
  .logo .lg-txt{font-size:14px}
  .btn{padding:10px 16px}
  .hero-cta{gap:10px}
  .hero-cta .btn{flex:1}
  .slogan{letter-spacing:1px}
}

/* ---- 桌面可视性：超宽屏留白、分屏小窗口不乱 ---- */
@media (min-width:1440px){
  :root{--maxw:1200px}
  .hero h1{font-size:42px}
}
@media (min-width:1100px) and (max-width:1439px){
  :root{--maxw:1180px}
}