/* BITKAY — bitkay.com · 设计系统 v1 · 白底清爽 + 深板岩蓝 */
:root{
  --white:#FFFFFF;
  --cloud:#F7FAFC;
  --slate:#3E5A6E;
  --slate-deep:#334B5C;
  --sky:#4A7FA7;
  --sky-dark:#3D6E93;
  --sky-soft:#EAF2F8;
  --ink:#2A3B47;
  --body:#3A4B57;
  --grey:#6B7C88;
  --grey-light:#9AA8B2;
  --line:#E3EAEF;
  --accent:#C9544A;
  --green:#3E8E6B;
  --rose:#A8797F;
  --rose-soft:#F4ECED;
  --lav:#E9ECF4;
  --cut:48px;
  --serif:"Noto Serif SC",serif;
  --sans:"Noto Sans SC",sans-serif;
  --en:"Nunito",sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{background:var(--white);color:var(--ink);font-family:var(--sans);overflow-x:hidden;-webkit-font-smoothing:antialiased}
a{text-decoration:none;color:var(--sky)}
img{max-width:100%;height:auto;display:block}
button{font-family:var(--sans)}

/* ─────────── 顶部头带 ─────────── */
.site-header{background:var(--slate);padding:0 40px;position:relative;z-index:50}
.navwrap{max-width:1180px;margin:0 auto;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;height:104px;gap:34px}
.menu{display:flex;align-items:center;gap:32px;font-size:15px;white-space:nowrap}
.menu.left{justify-content:flex-end}
.menu.right{justify-content:flex-start}
.menu a{color:rgba(255,255,255,.88);font-weight:500;padding:6px 0}
.menu a:hover{color:#fff}
.wordmark{display:flex;flex-direction:column;align-items:center;gap:0;color:#fff;text-align:center;position:relative;padding:8px 4px}
.wordmark .row{display:flex;align-items:center;gap:10px}
.wordmark .mark{width:40px;height:40px;border:1.6px solid rgba(255,255,255,.85);border-radius:50%;display:flex;align-items:center;justify-content:center;font-family:var(--en);font-weight:800;font-size:18px;color:#fff}
.wordmark .name{font-family:var(--en);font-weight:800;font-size:25px;letter-spacing:.16em;color:#fff}
.wordmark .tag{font-size:10.5px;letter-spacing:.42em;color:rgba(255,255,255,.5);position:absolute;top:calc(100% + 3px);left:50%;transform:translateX(-50%);white-space:nowrap}

/* ─────────── OKX 官方 logo(方案A·仅用于"我在推广该所"位) ─────────── */
.okx-logo{display:inline-flex;align-items:center;justify-content:center;background:#0B0B0C;color:#fff;font-family:var(--en);font-weight:800;letter-spacing:.06em;border-radius:10px;line-height:1}
.okx-logo-lg{height:52px;padding:0 20px;font-size:27px}
.okx-logo-md{height:40px;padding:0 15px;font-size:20px}
.okx-logo-sm{height:32px;padding:0 12px;font-size:16px}
.partner-strip{display:flex;align-items:center;gap:14px;margin-bottom:18px;flex-wrap:wrap}
.partner-strip .bk-mark{width:46px;height:46px;border-radius:50%;background:var(--slate);color:#fff;display:flex;align-items:center;justify-content:center;font-family:var(--en);font-weight:800;font-size:20px;flex:none}
.partner-strip .x{font-family:var(--en);font-weight:600;color:var(--grey-light);font-size:18px}
.partner-strip .pt-label{display:flex;flex-direction:column;gap:2px}
.partner-strip .pt-label b{font-family:var(--en);font-weight:800;font-size:13px;letter-spacing:.14em;color:var(--slate-deep)}
.partner-strip .pt-label span{font-size:11.5px;color:var(--grey-light)}
.cta-okx{display:flex;align-items:center;justify-content:center;gap:12px;background:#0B0B0C;color:#fff;font-size:17px;font-weight:700;letter-spacing:.04em;padding:14px 12px;border-radius:999px;min-height:48px;box-shadow:0 6px 0 -2px rgba(0,0,0,.28), 0 10px 22px -10px rgba(0,0,0,.5);transition:transform .18s ease,box-shadow .18s ease}
.cta-okx:hover{transform:translateY(-2px)}
.cta-okx .okx-word{font-family:var(--en);font-weight:800;font-size:19px;letter-spacing:.06em;line-height:1;border-right:1px solid rgba(255,255,255,.28);padding-right:12px}
.footer-partner{display:flex;align-items:center;gap:12px;margin-top:14px;flex-wrap:wrap}
.footer-partner .fp-note{font-size:12px;color:var(--grey);line-height:1.7}
.nav-toggle{display:none;background:none;border:none;cursor:pointer;padding:10px;min-width:44px;min-height:44px}
.nav-toggle span{display:block;width:22px;height:2px;background:#fff;margin:5px 0;border-radius:2px}
.mobile-menu{display:none}

/* ─────────── 行情条 ─────────── */
.tickerbar{background:var(--slate-deep);color:#C7D5DF;font-family:var(--en);font-size:12.5px;overflow:hidden;white-space:nowrap;display:none}
.tickerbar.on{display:block}
.tickerbar .inner{display:inline-flex;gap:36px;padding:7px 20px;animation:tickmove 46s linear infinite}
.tickerbar .up{color:#8FD3A0}
.tickerbar .dn{color:#E0837A}
.tickerbar .sym{color:#8CA3B2}
@keyframes tickmove{0%{transform:translateX(0)}100%{transform:translateX(-50%)}}

/* ─────────── Hero(首页) ─────────── */
.hero{background:repeating-linear-gradient(135deg, rgba(74,127,167,.045) 0 2px, transparent 2px 14px),var(--white);padding:64px 40px calc(64px + var(--cut));position:relative;overflow:hidden;clip-path:polygon(0 0,100% 0,100% calc(100% - var(--cut)),0 100%)}
.hero-bg{position:absolute;inset:0;z-index:0;pointer-events:none}
.hero-bg .poly{width:100%;height:100%;display:block}
.hero-hex{position:absolute}
.hex-a{top:30px;right:44px;width:76px;height:76px}
.hex-b{bottom:64px;left:-26px;width:130px;height:130px}
.herowrap{max-width:1180px;margin:0 auto;display:grid;grid-template-columns:1.15fr .85fr;gap:64px;align-items:center;position:relative;z-index:1}
.herowrap>div{min-width:0}
.lead-note{font-size:14px;color:var(--rose);font-style:italic;font-weight:500;margin-bottom:14px}
.hero h1{font-family:var(--serif);font-weight:900;font-size:clamp(28px,3.2vw,44px);line-height:1.4;letter-spacing:.01em;margin-bottom:20px}
.hero h1 .hl{color:var(--sky)}
.hero .sub{font-size:16px;line-height:2;color:var(--grey);max-width:32em;margin-bottom:22px}
.checks{list-style:none;margin-bottom:30px}
.checks li{font-size:15.5px;line-height:2.1;color:var(--ink)}
.checks li::before{content:"\2713\00a0\00a0";color:var(--sky);font-weight:700}
.hero-actions{display:flex;align-items:center;gap:18px;flex-wrap:wrap}
.btn-main{display:inline-flex;align-items:center;justify-content:center;gap:10px;background:var(--sky);color:#fff;font-size:17px;font-weight:700;padding:15px 34px;border-radius:999px;box-shadow:0 6px 0 -2px rgba(51,75,92,.18), 0 8px 20px -8px rgba(74,127,167,.45);min-height:44px;transition:transform .18s ease,background .18s ease,box-shadow .18s ease}
.btn-main:hover{background:var(--sky-dark);transform:translateY(-2px)}
.btn-main .arrow{width:26px;height:26px;border-radius:50%;background:rgba(255,255,255,.22);display:flex;align-items:center;justify-content:center;font-size:14px}
.btn-ghost{font-size:15px;color:var(--sky);font-weight:500;border-bottom:1.5px solid transparent;padding:4px 2px;min-height:44px;display:inline-flex;align-items:center}
.btn-ghost:hover{border-color:var(--sky)}

/* ─────────── 转化卡(hero右侧/侧栏共用) ─────────── */
.card{background:var(--white);border:1px solid var(--line);border-radius:16px;box-shadow:0 24px 60px -28px rgba(51,75,92,.28);padding:34px 34px 28px;position:relative}
.card .ribbon{position:absolute;top:-13px;left:50%;transform:translateX(-50%);background:var(--slate);color:#fff;font-size:12.5px;letter-spacing:.18em;padding:5px 18px;border-radius:999px;white-space:nowrap}
.card h2,.card .card-title{font-family:var(--serif);font-weight:700;font-size:21px;text-align:center;margin:6px 0}
.card .benefit{text-align:center;font-size:14px;color:var(--grey);margin-bottom:20px}
.card .benefit b{color:var(--accent);font-weight:700}
.codebox{display:flex;align-items:stretch;gap:10px;margin-bottom:16px}
.codebox .code{flex:1;text-align:center;font-family:var(--en);font-weight:800;font-size:30px;letter-spacing:.14em;color:var(--slate-deep);background:var(--sky-soft);border:1.5px dashed var(--sky);border-radius:10px;padding:10px 8px}
.copybtn{font-size:13.5px;font-weight:500;background:var(--white);border:1.5px solid var(--line);border-radius:10px;color:var(--ink);padding:0 16px;cursor:pointer;min-height:44px;min-width:64px}
.copybtn:hover{border-color:var(--sky);color:var(--sky)}
.card .cta{display:block;text-align:center;background:var(--sky);color:#fff;font-size:17px;font-weight:700;letter-spacing:.04em;padding:15px 10px;border-radius:999px;min-height:44px;box-shadow:0 6px 0 -2px rgba(51,75,92,.18), 0 8px 20px -8px rgba(74,127,167,.45);transition:transform .18s ease,background .18s ease,box-shadow .18s ease}
.card .cta:hover{background:var(--sky-dark);transform:translateY(-2px)}
.card .note{font-size:11.5px;color:var(--grey-light);line-height:1.7;margin-top:14px;text-align:center}
.card .steps{display:flex;justify-content:space-between;gap:6px;border-top:1px solid var(--line);margin-top:20px;padding-top:16px}
.card .steps span{font-size:12px;color:var(--grey);text-align:center;flex:1}
.card .steps b{display:block;font-family:var(--en);font-weight:800;font-size:15px;color:var(--sky);margin-bottom:2px}

/* ─────────── 首页分区 ─────────── */
.section{padding:56px 40px}
.section.alt{background:var(--cloud)}
.sectionwrap{max-width:1180px;margin:0 auto}
.sec-head{display:flex;align-items:baseline;justify-content:space-between;gap:20px;margin-bottom:30px;flex-wrap:wrap}
.sec-head h2{font-family:var(--serif);font-weight:900;font-size:27px;display:flex;align-items:center;gap:12px}
.sec-head h2::before{content:"";width:5px;height:22px;background:var(--sky);border-radius:3px}
.sec-head .more{font-size:14px;color:var(--sky);font-weight:500}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.grid4{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.post-card{background:var(--white);border:1px solid var(--line);border-radius:14px;overflow:hidden;transition:box-shadow .2s,transform .2s;display:flex;flex-direction:column}
.post-card:hover{box-shadow:0 18px 44px -22px rgba(51,75,92,.35);transform:translateY(-3px)}
.post-card .pc-img{aspect-ratio:1200/630;background:var(--sky-soft);overflow:hidden}
.post-card .pc-img img{width:100%;height:100%;object-fit:cover}
.post-card .pc-body{padding:18px 20px 20px;display:flex;flex-direction:column;gap:8px;flex:1}
.post-card .pc-tag{font-size:11.5px;font-family:var(--en);font-weight:800;letter-spacing:.08em;color:var(--sky)}
.post-card h3{font-family:var(--serif);font-weight:700;font-size:17px;line-height:1.6}
.post-card h3 a{color:var(--ink)}
.post-card h3 a:hover{color:var(--sky)}
.post-card .pc-desc{font-size:13px;color:var(--grey);line-height:1.8}
.post-card .pc-meta{font-size:12px;color:var(--grey-light);margin-top:auto}
.tool-card{background:var(--white);border:1px solid var(--line);border-radius:14px;padding:24px 22px;transition:box-shadow .2s,transform .2s}
.tool-card:hover{box-shadow:0 18px 44px -22px rgba(51,75,92,.35);transform:translateY(-3px)}
.tool-card .tc-icon{width:46px;height:46px;border-radius:12px;background:var(--sky-soft);color:var(--sky);font-family:var(--en);font-weight:800;font-size:15px;display:flex;align-items:center;justify-content:center;margin-bottom:14px}
.tool-card h3{font-family:var(--serif);font-weight:700;font-size:16.5px;margin-bottom:8px}
.tool-card h3 a{color:var(--ink)}
.tool-card h3 a:hover{color:var(--sky)}
.tool-card p{font-size:13px;color:var(--grey);line-height:1.8}
.linkhub{columns:3;column-gap:40px}
.linkhub li{list-style:none;break-inside:avoid;padding:9px 0;border-bottom:1px solid var(--line);font-size:14.5px}
.linkhub li a{color:var(--body)}
.linkhub li a:hover{color:var(--sky)}

/* ─────────── 文章页 ─────────── */
.page{max-width:1180px;margin:0 auto;display:grid;grid-template-columns:minmax(0,1fr) 340px;gap:56px;padding:56px 40px 80px}
article{min-width:0}
article h1{font-family:var(--serif);font-weight:900;font-size:clamp(26px,2.6vw,36px);line-height:1.5;margin-bottom:14px}
.meta{font-size:13.5px;color:var(--grey);font-style:italic;padding-bottom:18px;border-bottom:1px solid var(--line);margin-bottom:28px}
.article-cover{border-radius:12px;overflow:hidden;margin-bottom:30px}
.article-cover img{width:100%}
.toc{background:var(--cloud);border:1px solid var(--line);border-radius:12px;padding:22px 26px;margin-bottom:34px}
.toc .t{font-weight:700;font-size:15px;margin-bottom:12px;display:flex;align-items:center;gap:8px}
.toc .t::before{content:"";width:4px;height:16px;background:var(--sky);border-radius:2px}
.toc ol{margin-left:20px;font-size:14.5px;line-height:2.2}
.toc a{color:var(--sky)}
.toc a:hover{text-decoration:underline;text-underline-offset:4px}
article p{font-size:16px;line-height:2;color:var(--body);margin-bottom:20px}
article h2{font-family:var(--serif);font-weight:700;font-size:24px;line-height:1.5;margin:40px 0 16px;padding-left:14px;border-left:4px solid var(--sky)}
article h3{font-family:var(--serif);font-weight:700;font-size:19px;margin:28px 0 12px}
article ul,article ol{margin:0 0 20px 24px;font-size:15.5px;line-height:2;color:var(--body)}
article li{margin-bottom:4px}
article table{width:100%;border-collapse:collapse;margin:0 0 26px;font-size:14.5px}
article th{background:var(--sky-soft);color:var(--slate-deep);font-weight:700;text-align:left;padding:11px 14px;border:1px solid var(--line)}
article td{padding:11px 14px;border:1px solid var(--line);color:var(--body);line-height:1.7}
article tr:nth-child(even) td{background:var(--cloud)}
article figure{margin:18px 0 26px}
article figure img{border:1px solid var(--line);border-radius:10px}
article figcaption{font-size:12.5px;color:var(--grey-light);text-align:center;margin-top:8px}
article blockquote{border-left:4px solid var(--line);padding:4px 0 4px 18px;color:var(--grey);margin-bottom:20px;font-size:15px;line-height:1.9}
.tipbox{background:var(--sky-soft);border-left:4px solid var(--sky);border-radius:0 10px 10px 0;padding:16px 20px;font-size:14.5px;line-height:1.9;color:#3A5A72;margin-bottom:26px}
.warnbox{background:#FBF1F0;border-left:4px solid var(--accent);border-radius:0 10px 10px 0;padding:16px 20px;font-size:14.5px;line-height:1.9;color:#7A4A45;margin-bottom:26px}
.inline-cta{display:flex;align-items:center;justify-content:space-between;gap:18px;background:var(--cloud);border:1px solid var(--line);border-radius:14px;padding:22px 26px;margin:34px 0}
.inline-cta .txt b{font-size:16.5px;display:block;margin-bottom:4px;color:var(--ink)}
.inline-cta .txt span{font-size:13.5px;color:var(--grey)}
.inline-cta .txt .red{color:var(--accent);font-weight:700}
.inline-cta .btn-main{flex:none;font-size:16px;padding:13px 28px}
.faq-item{border-bottom:1px solid var(--line);padding:18px 0}
.faq-item h3{font-family:var(--serif);font-weight:700;font-size:17px;margin:0 0 10px}
.faq-item p{font-size:15px;line-height:1.95;margin-bottom:0}

/* ─────────── 侧栏 ─────────── */
aside.sidebar{display:flex;flex-direction:column;gap:26px;min-width:0}
.widget{background:var(--white);border:1px solid var(--line);border-radius:16px;padding:26px 24px;box-shadow:0 14px 36px -24px rgba(51,75,92,.25)}
.widget .wt{font-weight:700;font-size:15.5px;margin-bottom:14px;display:flex;align-items:center;gap:8px}
.widget .wt::before{content:"";width:4px;height:16px;background:var(--sky);border-radius:2px}
.brand-card{text-align:center}
.brand-card .bmark{width:64px;height:64px;margin:4px auto 12px;border-radius:50%;background:var(--slate);color:#fff;display:flex;align-items:center;justify-content:center;font-family:var(--en);font-weight:800;font-size:26px}
.brand-card .bn{font-family:var(--en);font-weight:800;letter-spacing:.14em;font-size:17px;color:var(--slate-deep)}
.brand-card p{font-size:13.5px;color:var(--grey);line-height:1.9;margin-top:10px;text-align:left}
.side-voucher{text-align:center}
.side-voucher .benefit{font-size:13.5px;color:var(--grey);margin-bottom:14px}
.side-voucher .benefit b{color:var(--accent)}
.side-voucher .codebox .code{font-size:24px;letter-spacing:.12em;padding:9px 6px}
.side-voucher .cta{display:block;background:var(--sky);color:#fff;font-size:15.5px;font-weight:700;padding:13px 8px;border-radius:999px;min-height:44px}
.side-voucher .cta:hover{background:var(--sky-dark)}
.side-voucher .note{font-size:11px;color:var(--grey-light);line-height:1.7;margin-top:10px}
.readlist{list-style:none}
.readlist li{display:flex;gap:12px;align-items:center;padding:10px 0;border-bottom:1px solid var(--line)}
.readlist li:last-child{border-bottom:none}
.readlist .thumb{flex:none;width:56px;height:42px;border-radius:8px;background:linear-gradient(135deg,var(--sky-soft),#D8E6F1);display:flex;align-items:center;justify-content:center;font-family:var(--en);font-weight:800;font-size:11px;color:var(--sky)}
.readlist a{font-size:14px;color:var(--ink);line-height:1.6;font-weight:500}
.readlist a:hover{color:var(--sky)}

/* ─────────── 工具页 ─────────── */
.tool-shell{max-width:860px;margin:0 auto;padding:56px 40px 80px}
.tool-shell h1{font-family:var(--serif);font-weight:900;font-size:clamp(25px,2.4vw,34px);line-height:1.5;margin-bottom:12px}
.tool-shell .meta{margin-bottom:26px}
.tool-panel{background:var(--white);border:1px solid var(--line);border-radius:16px;padding:30px;box-shadow:0 20px 50px -28px rgba(51,75,92,.3);margin-bottom:30px}
.tool-panel .frow{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-bottom:18px}
.tool-panel label{display:block;font-size:13.5px;font-weight:500;color:var(--grey);margin-bottom:7px}
.tool-panel input,.tool-panel select{width:100%;font-size:16px;font-family:var(--en);padding:12px 14px;border:1.5px solid var(--line);border-radius:10px;color:var(--ink);background:var(--white);min-height:44px}
.tool-panel input:focus,.tool-panel select:focus{outline:none;border-color:var(--sky)}
.tool-panel .runbtn{width:100%;background:var(--sky);color:#fff;border:none;font-size:16.5px;font-weight:700;padding:15px;border-radius:999px;cursor:pointer;min-height:44px;margin-top:6px}
.tool-panel .runbtn:hover{background:var(--sky-dark)}
.result-card{background:var(--slate-deep);border-radius:16px;color:#fff;padding:30px;margin-bottom:30px;display:none}
.result-card.on{display:block}
.result-card .rc-label{font-size:13px;color:#9DB4C4;margin-bottom:6px}
.result-card .rc-big{font-family:var(--en);font-weight:800;font-size:44px;letter-spacing:.01em;line-height:1.2}
.result-card .rc-big small{font-size:20px;color:#9DB4C4;font-weight:600}
.result-card .rc-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:22px;padding-top:20px;border-top:1px solid rgba(255,255,255,.14)}
.result-card .rc-grid .k{font-size:12px;color:#9DB4C4;margin-bottom:4px}
.result-card .rc-grid .v{font-family:var(--en);font-weight:700;font-size:19px}
.result-card .rc-bar{height:10px;border-radius:5px;background:rgba(255,255,255,.14);overflow:hidden;margin-top:18px}
.result-card .rc-bar i{display:block;height:100%;background:linear-gradient(90deg,#6FA6CC,#8FD3A0)}
.tool-note{font-size:12.5px;color:var(--grey-light);line-height:1.8;margin-bottom:34px}
.seo-guide{border-top:1px solid var(--line);padding-top:30px}
.seo-guide h2{font-family:var(--serif);font-weight:700;font-size:22px;margin:26px 0 14px;padding-left:14px;border-left:4px solid var(--sky)}
.seo-guide p{font-size:15.5px;line-height:2;color:var(--body);margin-bottom:18px}
.seo-guide details{border:1px solid var(--line);border-radius:10px;padding:14px 18px;margin-bottom:12px}
.seo-guide summary{font-weight:700;font-size:15px;cursor:pointer;color:var(--ink);padding:10px 0;margin:-6px 0}
.seo-guide details p{margin:12px 0 0;font-size:14.5px}

/* ─────────── Footer ─────────── */
.site-footer{background:var(--lav);color:var(--grey);margin-top:40px}
.footwrap{max-width:1180px;margin:0 auto;padding:52px 40px 30px;display:grid;grid-template-columns:1.2fr 1fr 1fr 1fr;gap:40px}
.footwrap h4{font-family:var(--en);font-weight:800;letter-spacing:.14em;color:var(--slate-deep);font-size:15px;margin-bottom:14px}
.footwrap h5{color:var(--slate-deep);font-size:14.5px;font-weight:700;margin-bottom:12px}
.footwrap ul{list-style:none}
.footwrap li{margin-bottom:2px;font-size:13.5px}
.footwrap li a{display:inline-block;padding:9px 0}
.footwrap a{color:var(--grey)}
.footwrap a:hover{color:var(--sky)}
.footwrap .fbrand p{font-size:13px;line-height:1.9;margin-top:10px}
.footbar{border-top:1px solid #D5DAE8}
.footbar .inner{max-width:1180px;margin:0 auto;padding:18px 40px;font-size:12px;color:var(--grey);line-height:1.8}

/* ─────────── 404 ─────────── */
.notfound{max-width:640px;margin:0 auto;padding:90px 24px;text-align:center}
.notfound .code404{font-family:var(--en);font-weight:800;font-size:96px;color:var(--sky-soft);-webkit-text-stroke:2px var(--sky);line-height:1}
.notfound h1{font-family:var(--serif);font-weight:900;font-size:26px;margin:18px 0 12px}
.notfound p{font-size:15px;color:var(--grey);line-height:1.9;margin-bottom:26px}

/* ─────────── 响应式 ─────────── */
@media (max-width:1024px){
  .grid4{grid-template-columns:repeat(2,1fr)}
  .grid3{grid-template-columns:repeat(2,1fr)}
  .linkhub{columns:2}
  .herowrap{gap:40px}
  .page{grid-template-columns:minmax(0,1fr) 300px;gap:36px}
}
@media (max-width:900px){
  .site-header{padding:0 18px}
  .navwrap{height:66px;grid-template-columns:auto 1fr auto;gap:10px}
  .menu{display:none}
  .okx-logo-lg{height:38px;padding:0 14px;font-size:20px}
  .hero .sub{display:none}
  .partner-strip{gap:10px;margin-bottom:6px}
  .card .note{margin-top:8px}
  .partner-strip .bk-mark{width:36px;height:36px;font-size:16px}
  .wordmark{grid-column:2;justify-self:center}
  .wordmark .mark{width:30px;height:30px;font-size:14px}
  .wordmark .name{font-size:19px}
  .wordmark .tag{display:none}
  .nav-toggle{display:block;grid-column:1}
  .nav-spacer{grid-column:3;width:44px}
  .mobile-menu.open{display:block;background:var(--slate-deep);padding:10px 18px 18px}
  .mobile-menu a{display:block;color:rgba(255,255,255,.9);font-size:15px;padding:12px 4px;border-bottom:1px solid rgba(255,255,255,.08)}
  .mobile-menu a:last-child{border-bottom:none}
  .tickerbar{display:none !important}
  .hero{padding:18px 18px 44px}
  .herowrap{grid-template-columns:1fr;gap:16px}
  .lead-note{font-size:12.5px;margin-bottom:8px}
  .hero h1{font-size:24.5px;margin-bottom:10px}
  .hero .sub{font-size:13.5px;line-height:1.8;margin-bottom:10px}
  .checks{margin-bottom:16px}
  .checks li{font-size:13.5px;line-height:1.9}
  .card{padding:26px 20px 20px}
  .card h2,.card .card-title{font-size:18px}
  .codebox .code{font-size:24px}
  .section{padding:36px 18px}
  .sec-head h2{font-size:22px}
  .grid3,.grid4{grid-template-columns:1fr}
  .linkhub{columns:1}
  .page{grid-template-columns:1fr;gap:34px;padding:26px 18px 50px}
  article h1{font-size:23px}
  article h2{font-size:20px}
  article p{font-size:15px;line-height:1.9}
  article table{display:block;overflow-x:auto;-webkit-overflow-scrolling:touch}
  .inline-cta{flex-direction:column;align-items:stretch;text-align:center}
  .tool-shell{padding:26px 18px 50px}
  .tool-panel{padding:22px 18px}
  .tool-panel .frow{grid-template-columns:1fr}
  .result-card{padding:22px 18px}
  .result-card .rc-big{font-size:32px}
  .result-card .rc-grid{grid-template-columns:1fr 1fr}
  .footwrap{grid-template-columns:1fr 1fr;gap:28px;padding:36px 18px 22px}
  .footbar .inner{padding:14px 18px}
}
@media (max-width:400px){
  .hero h1{font-size:22px}
  .codebox .code{font-size:21px}
}

/* ─────────── v2 · 共情痛点区 ─────────── */
.pains{text-align:center;padding-top:64px;padding-bottom:58px}
.pains h2{font-family:var(--serif);font-weight:900;font-size:27px;line-height:1.6;margin-bottom:26px}
.pain-list{list-style:none;margin:0 auto}
.pain-list li{display:flex;align-items:center;justify-content:center;gap:12px}
.pain-list li::before{content:"";flex:none;width:10px;height:11px;background:var(--rose);clip-path:polygon(50% 0,100% 25%,100% 75%,50% 100%,0 75%,0 25%)}
.pain-list a{font-family:var(--serif);font-weight:600;font-size:17.5px;line-height:2.5;color:var(--ink)}
.pain-list a:hover{color:var(--sky)}
.pain-note{font-size:13.5px;color:var(--grey);margin-top:22px}

/* ─────────── v2 · 分区斜切 ─────────── */
.cut-desc{clip-path:polygon(0 0,100% var(--cut),100% 100%,0 calc(100% - var(--cut)));padding-top:calc(56px + var(--cut));padding-bottom:calc(56px + var(--cut))}

/* ─────────── v2 · 踩坑手记 band ─────────── */
.notes-band{background:var(--slate);position:relative;overflow:hidden;clip-path:polygon(0 var(--cut),100% 0,100% calc(100% - var(--cut)),0 100%);margin-top:calc(-1 * var(--cut));padding-top:calc(64px + var(--cut));padding-bottom:calc(64px + var(--cut))}
.notes-band .sectionwrap{position:relative;z-index:1}
.notes-band h2{font-family:var(--serif);font-weight:900;font-size:27px;color:#fff;text-align:center;margin-bottom:44px}
.band-deco{position:absolute;pointer-events:none;z-index:0}
.deco-a{top:-26px;right:5%;width:190px;height:190px}
.deco-b{bottom:-20px;left:3%;width:150px;height:150px}
.notes-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:30px;align-items:start}
.note-card{background:var(--white);border-radius:12px;padding:26px 24px 22px;box-shadow:0 8px 0 -3px rgba(0,0,0,.22), 0 24px 44px -20px rgba(0,0,0,.4)}
.note-card.tilt-l{transform:rotate(-1deg)}
.note-card.tilt-r{transform:rotate(1deg)}
.ntag{display:inline-block;background:var(--rose);color:#fff;font-size:11.5px;font-weight:500;letter-spacing:.1em;padding:4px 12px;border-radius:4px;margin-bottom:14px}
.note-card p{font-size:14.5px;line-height:2;color:var(--body);margin-bottom:14px}
.note-card a{font-size:13.5px;color:var(--sky);font-weight:500}
.note-card a:hover{color:var(--sky-dark)}

@media (max-width:900px){
  :root{--cut:24px}
  .hero-bg{display:none}
  .hero{padding-bottom:calc(40px + var(--cut))}
  .pains{padding-top:44px;padding-bottom:40px}
  .pains h2{font-size:22px}
  .pain-list a{font-size:15.5px;line-height:2.3;text-align:left}
  .cut-desc{padding-top:calc(36px + var(--cut));padding-bottom:calc(36px + var(--cut))}
  .notes-band{padding-top:calc(44px + var(--cut));padding-bottom:calc(44px + var(--cut))}
  .notes-band h2{font-size:22px;margin-bottom:30px}
  .notes-grid{grid-template-columns:1fr;gap:22px}
  .deco-a{width:130px;height:130px}
  .deco-b{display:none}
}