/* KirinAI 转版 AI 工具官网 —— 独立样式（与主站、CBAM 官网同一视觉语言） */
:root{
  --blue-900:#062744; --blue-800:#082C52; --blue-700:#0D4A85; --blue-600:#1268B3;
  --blue-500:#1B82D6; --blue-100:#D8EAF8; --blue-50:#EDF6FD;
  --ink:#12212F; --ink-2:#3D4C5A; --muted:#6C7C8C; --line:#E2E9F0; --bg:#F6F9FC;
  --ok:#0E6B45; --ok-bg:#E6F7EE; --warn:#9A6A00; --warn-bg:#FDF3E0;
  --r:14px; --sh:0 6px 22px rgba(12,52,92,.08); --sh-sm:0 2px 8px rgba(12,52,92,.06);
  --wrap:1180px;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",system-ui,-apple-system,sans-serif;
  color:var(--ink);background:#fff;font-size:16px;line-height:1.75;overflow-x:hidden}
a{color:var(--blue-600);text-decoration:none}
a:hover{text-decoration:none;color:var(--blue-700)}
img{max-width:100%;height:auto}
h1,h2,h3,h4{margin:0;line-height:1.4;font-weight:700}
p{margin:0 0 12px}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 22px}
.muted{color:var(--muted)}
.center{text-align:center}

/* ---------- 按钮 ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 24px;
  border-radius:10px;font-size:15px;font-weight:600;border:1px solid transparent;cursor:pointer;
  transition:transform .12s,box-shadow .12s,background .15s;white-space:nowrap}
.btn:active{transform:translateY(1px)}
.btn-primary{background:var(--blue-600);color:#fff;box-shadow:0 4px 14px rgba(18,104,179,.28)}
.btn-primary:hover{background:var(--blue-700);color:#fff}
.btn-white{background:#fff;color:var(--blue-700)}
.btn-white:hover{background:var(--blue-50)}
.btn-line{border-color:rgba(255,255,255,.55);color:#fff}
.btn-line:hover{background:rgba(255,255,255,.12);color:#fff}
.btn-ghost{border-color:var(--line);color:var(--ink);background:#fff}
.btn-ghost:hover{border-color:var(--blue-500);color:var(--blue-700)}
.btn-sm{padding:9px 18px;font-size:14px}
.btn-block{width:100%}

/* ---------- 头部 ---------- */
.hd{position:sticky;top:0;z-index:60;background:rgba(255,255,255,.96);backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line)}
.hd-in{display:flex;align-items:center;gap:26px;height:70px}
.brand{display:flex;align-items:center;gap:11px;color:var(--ink)}
.brand-mark{width:38px;height:38px;border-radius:11px;display:grid;place-items:center;
  background:linear-gradient(135deg,var(--blue-700),var(--blue-500));color:#fff;font-weight:800;font-size:19px}
.brand-txt{display:flex;flex-direction:column;line-height:1.25}
.brand-txt b{font-size:17px;letter-spacing:.2px}
.brand-txt i{font-style:normal;font-size:12px;color:var(--muted)}
.nav{display:flex;gap:22px;margin-left:auto}
.nav a{color:var(--ink-2);font-size:15px;font-weight:500;padding:6px 0;border-bottom:2px solid transparent}
.nav a:hover{color:var(--blue-700)}
.nav a.on{color:var(--blue-700);border-bottom-color:var(--blue-600);font-weight:600}
.hd-cta{display:flex;gap:10px;align-items:center}
.hd-user{display:flex;align-items:center;gap:8px;font-size:14px;color:var(--ink-2)}
.burger{display:none;background:none;border:1px solid var(--line);border-radius:9px;font-size:19px;
  padding:5px 11px;cursor:pointer;color:var(--ink)}

/* ---------- Hero ---------- */
.hero{position:relative;overflow:hidden;color:#fff;
  background:linear-gradient(125deg,#062744 0%,#0D4A85 52%,#1268B3 100%)}
.hero::after{content:'';position:absolute;right:-90px;top:-110px;width:420px;height:420px;border-radius:50%;
  background:radial-gradient(circle,rgba(255,255,255,.12),rgba(255,255,255,0) 70%)}
.hero::before{content:'';position:absolute;left:-70px;bottom:-140px;width:320px;height:320px;border-radius:50%;
  background:radial-gradient(circle,rgba(255,255,255,.08),rgba(255,255,255,0) 70%)}
.hero-in{position:relative;z-index:2;padding:66px 0 60px;max-width:900px}
.hero h1{font-size:42px;letter-spacing:.4px;margin-bottom:16px}
.hero h1 .hl{color:#7FD1FF}
.hero .sub{font-size:17px;color:rgba(255,255,255,.88);line-height:1.85;margin-bottom:26px}
.hero .btns{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:26px}
.hero .badges{display:flex;flex-wrap:wrap;gap:10px}
.hero .badges span{font-size:13.5px;padding:6px 14px;border-radius:999px;background:rgba(255,255,255,.14);
  border:1px solid rgba(255,255,255,.28)}

/* ---------- 通用区块 ---------- */
.sec{padding:70px 0}
.sec.alt{background:var(--bg)}
.sec-head{max-width:760px;margin:0 auto 40px;text-align:center}
.sec-head h2{font-size:30px;margin-bottom:12px}
.sec-head p{color:var(--muted);font-size:16px}
.eyebrow{display:inline-block;font-size:13px;font-weight:700;color:var(--blue-600);background:var(--blue-50);
  border:1px solid var(--blue-100);padding:5px 14px;border-radius:999px;margin-bottom:14px;letter-spacing:.4px}

.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:#fff;border:1px solid var(--line);border-radius:var(--r);padding:28px;box-shadow:var(--sh-sm)}
.card h3{font-size:18px;margin-bottom:10px}
.card .tag{display:inline-block;font-size:12px;font-weight:700;color:var(--blue-700);background:var(--blue-50);
  border:1px solid var(--blue-100);padding:3px 10px;border-radius:999px;margin-left:8px;vertical-align:middle}
.card .ic{font-size:26px;margin-bottom:12px}
.card p{color:var(--ink-2);font-size:15px;margin-bottom:12px}
.card ul{margin:0;padding-left:20px;color:var(--ink-2);font-size:14.6px}
.card li{margin-bottom:6px}
.card .out{margin-top:14px;padding-top:12px;border-top:1px dashed var(--line);font-size:13.4px;color:var(--muted)}
.card .out b{color:var(--ink)}

.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.stat{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:24px;text-align:center}
.stat b{display:block;font-size:26px;color:var(--blue-700);margin-bottom:6px}
.stat span{font-size:14px;color:var(--muted)}

.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.step{position:relative;background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:26px 24px}
.step .n{font-size:24px;font-weight:800;color:var(--blue-100);margin-bottom:8px}
.step h3{font-size:16.5px;margin-bottom:8px}
.step p{color:var(--ink-2);font-size:14.4px;margin:0}

.facts{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.fact{display:flex;gap:14px;background:#fff;border:1px solid var(--line);border-radius:12px;padding:20px 22px}
.fact b{display:block;color:var(--blue-700);font-size:15.4px;margin-bottom:4px}
.fact span{font-size:14.4px;color:var(--ink-2)}
.fact i{font-style:normal;font-size:13.4px;color:var(--muted);display:block;margin-top:4px}

/* FAQ */
.faqs{max-width:900px;margin:0 auto}
.faqs details{background:#fff;border:1px solid var(--line);border-radius:12px;margin-bottom:12px;overflow:hidden}
.faqs summary{cursor:pointer;padding:18px 22px;font-weight:600;font-size:16px;list-style:none;
  display:flex;justify-content:space-between;align-items:center;gap:14px}
.faqs summary::-webkit-details-marker{display:none}
.faqs summary::after{content:'＋';color:var(--blue-600);font-weight:700}
.faqs details[open] summary::after{content:'−'}
.faqs details[open] summary{border-bottom:1px solid var(--line);color:var(--blue-700)}
.faqs .a{padding:16px 22px 20px;color:var(--ink-2);font-size:15px}

/* 订阅条 */
.sub-band{background:linear-gradient(120deg,#0D4A85,#1268B3);color:#fff;border-radius:var(--r);
  padding:38px 40px;display:flex;gap:30px;align-items:center;justify-content:space-between;flex-wrap:wrap}
.sub-band h3{font-size:23px;margin-bottom:8px}
.sub-band p{color:rgba(255,255,255,.86);margin:0;font-size:14.8px}
.sub-band form{display:flex;gap:10px;flex-wrap:wrap}
.sub-band input{padding:12px 16px;border-radius:10px;border:1px solid rgba(255,255,255,.4);font-size:15px;
  min-width:250px;background:rgba(255,255,255,.96);color:var(--ink)}

/* CTA */
.cta-band{background:var(--blue-800);color:#fff;padding:52px 0}
.cta-in{display:flex;gap:26px;align-items:center;justify-content:space-between;flex-wrap:wrap}
.cta-in h2{font-size:25px;margin-bottom:8px}
.cta-in p{color:rgba(255,255,255,.82);margin:0;font-size:14.8px}
.cta-btns{display:flex;gap:12px;flex-wrap:wrap}

/* 页脚 */
.ft{background:#062744;color:rgba(255,255,255,.72);padding:52px 0 26px;font-size:14.4px}
.ft-in{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:32px}
.ft-col h4{color:#fff;font-size:15.4px;margin-bottom:14px}
.ft-col a{display:block;color:rgba(255,255,255,.72);margin-bottom:9px}
.ft-col a:hover{color:#fff}
.ft-brand .brand-txt b,.ft-brand .brand-txt i{color:#fff}
.ft-brand p{margin:14px 0 0;font-size:13.6px;line-height:1.8}
.ft-bottom{margin-top:34px;padding-top:20px;border-top:1px solid rgba(255,255,255,.14);
  display:flex;gap:18px;flex-wrap:wrap;align-items:center;font-size:13.4px}
.ft-bottom a{color:rgba(255,255,255,.72)}

/* 表单 */
.form-card{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:34px;box-shadow:var(--sh-sm)}
.fld{margin-bottom:15px}
.fld label{display:block;font-size:14px;color:var(--ink-2);margin-bottom:6px;font-weight:500}
.fld label i{color:#D93025;font-style:normal}
.fld input,.fld select,.fld textarea{width:100%;padding:12px 14px;font-size:15px;border:1px solid var(--line);
  border-radius:9px;font-family:inherit;background:#fff;transition:border-color .15s,box-shadow .15s}
.fld input:focus,.fld select:focus,.fld textarea:focus{outline:none;border-color:var(--blue-500);
  box-shadow:0 0 0 3px rgba(27,130,214,.12)}
.fld .hint{font-size:12.8px;color:var(--muted);margin-top:5px}
.topics{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
.topic{display:flex;gap:10px;align-items:flex-start;border:1px solid var(--line);border-radius:10px;padding:14px}
.topic input{margin-top:4px;accent-color:var(--blue-600)}
.topic b{font-size:14.8px;display:block}
.topic span{font-size:13.2px;color:var(--muted)}

.err{background:#FDECEA;border:1px solid #F5C6C2;color:#A3281C;border-radius:10px;padding:14px 18px;
  font-size:14.4px;margin-bottom:18px}
.ok{background:var(--ok-bg);border:1px solid #B9E6CC;color:var(--ok);border-radius:10px;padding:14px 18px;
  font-size:14.4px;margin-bottom:18px}

/* 两列布局（联系/订阅/注册/会员中心） */
.split{display:grid;grid-template-columns:1.35fr 1fr;gap:26px;align-items:start}
.split.member-grid{grid-template-columns:1fr 320px}
@media (max-width:900px){
  .split,.split.member-grid{grid-template-columns:1fr;gap:20px}
}

/* 表格 */
.tb-wrap{background:#fff;border:1px solid var(--line);border-radius:var(--r);overflow:auto}
table.tb{width:100%;border-collapse:collapse;font-size:14.4px;min-width:760px}
table.tb th{background:var(--blue-50);color:var(--blue-800);font-weight:600;text-align:left;
  padding:12px 14px;white-space:nowrap;border-bottom:1px solid var(--line)}
table.tb td{padding:11px 14px;border-bottom:1px solid var(--line);vertical-align:top}
table.tb tr:last-child td{border-bottom:none}
table.tb tr:hover td{background:#FAFCFF}
.pill{display:inline-block;font-size:12.6px;font-weight:600;padding:3px 11px;border-radius:999px;
  background:var(--blue-50);color:var(--blue-700);border:1px solid var(--blue-100)}
.pill.ok{background:var(--ok-bg);color:var(--ok);border-color:#B9E6CC}
.pill.off{background:#F1F3F6;color:var(--muted);border-color:var(--line)}

/* 会员中心 / 后台 */
.page-hero{background:var(--blue-800);color:#fff;padding:36px 0}
.page-hero h1{font-size:27px;margin-bottom:6px}
.page-hero p{margin:0;color:rgba(255,255,255,.8);font-size:14.8px}
.crumb{font-size:13.4px;color:rgba(255,255,255,.7);margin-bottom:12px}
.crumb a{color:rgba(255,255,255,.85)}
.kpi{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-bottom:26px}
.kpi div{background:#fff;border:1px solid var(--line);border-radius:12px;padding:20px}
.kpi b{display:block;font-size:24px;color:var(--blue-700)}
.kpi span{font-size:13.6px;color:var(--muted)}
.admin-nav{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:22px}
.admin-nav a{padding:9px 16px;border:1px solid var(--line);border-radius:9px;font-size:14.4px;background:#fff}
.admin-nav a.on{background:var(--blue-600);color:#fff;border-color:var(--blue-600)}
.side-nav{display:grid;gap:8px}
.side-nav a{padding:10px 14px;border-radius:9px;font-size:14.6px;color:var(--ink-2)}
.side-nav a.on{background:var(--blue-50);color:var(--blue-700);font-weight:600}

@media (max-width:1024px){
  .g4,.g3,.stats,.steps,.facts,.kpi{grid-template-columns:repeat(2,1fr)}
  .ft-in{grid-template-columns:1fr 1fr}
  .nav{display:none}
  .hd-cta{display:none}
  .burger{display:block;margin-left:auto}
  body.nav-open .nav{display:flex;flex-direction:column;position:absolute;left:0;right:0;top:70px;
    background:#fff;padding:16px 22px;gap:12px;border-bottom:1px solid var(--line);box-shadow:var(--sh);margin:0}
  body.nav-open .nav a{border-bottom:none;padding:8px 0}
  body.nav-open .hd-cta{display:flex;position:absolute;left:22px;right:22px;top:calc(70px + 15rem);
    justify-content:flex-start}
  .hero h1{font-size:32px}
  .hero-in{padding:48px 0 44px}
}
@media (max-width:640px){
  body{font-size:15.4px}
  .wrap{padding:0 16px}
  .sec{padding:46px 0}
  .sec-head h2{font-size:23px}
  .hero h1{font-size:25px}
  .hero .sub{font-size:15.4px}
  .g2,.g3,.g4,.stats,.steps,.facts,.kpi,.topics{grid-template-columns:1fr}
  .ft-in{grid-template-columns:1fr;gap:22px}
  .card{padding:22px 18px}
  .form-card{padding:22px 18px}
  .sub-band{padding:26px 20px;border-radius:12px}
  .sub-band input{min-width:0;width:100%}
  .cta-in{flex-direction:column;align-items:flex-start}
  .step,.fact{padding:20px 18px}
  .hero .btns{flex-direction:column;align-items:stretch}
  .hero .btns .btn{width:100%}
}