:root{
  --blue:#1677ff;--blue2:#0057ff;--cyan:#15c6ff;--purple:#7c3aed;
  --green:#10b981;--orange:#f59e0b;--ink:#10203f;--muted:#64748b;
  --bg:#f4f8ff;--card:#ffffff;--line:#dbeafe;--soft:#eef6ff;
  --shadow:0 18px 55px rgba(33,91,190,.12);
}
*{box-sizing:border-box}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",Arial,sans-serif;color:var(--ink);background:linear-gradient(180deg,#f7fbff 0%,#eef5ff 55%,#f8fbff 100%);}
a{text-decoration:none;color:inherit}
.topbar{height:70px;background:rgba(255,255,255,.9);backdrop-filter:blur(16px);border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 46px;position:sticky;top:0;z-index:10}
.logo{display:flex;align-items:center;gap:12px;font-weight:900}.logo-mark{width:36px;height:36px;border-radius:12px;background:linear-gradient(135deg,var(--blue),var(--cyan));box-shadow:0 12px 24px rgba(22,119,255,.25);position:relative}.logo-mark:after{content:"AI";position:absolute;color:white;font-weight:900;font-size:13px;left:9px;top:9px}.logo small{display:block;color:#6b7c9a;font-size:10px;letter-spacing:.08em}
.nav{display:flex;align-items:center;gap:36px;font-size:14px;font-weight:700;color:#27364f}.nav a.active{color:var(--blue);position:relative}.nav a.active:after{content:"";position:absolute;left:10%;right:10%;height:3px;background:var(--blue);bottom:-24px;border-radius:999px}.contact{background:linear-gradient(135deg,var(--blue),var(--blue2));color:white;padding:12px 20px;border-radius:10px;box-shadow:0 10px 24px rgba(22,119,255,.25)}
.hero{min-height:320px;border-bottom:1px solid var(--line);background:
radial-gradient(circle at 72% 35%,rgba(22,119,255,.20),transparent 22%),
linear-gradient(105deg,#fff 0%,#f2f8ff 42%,#eaf3ff 100%);position:relative;overflow:hidden}
.hero:before{content:"";position:absolute;right:210px;top:48px;width:260px;height:260px;border-radius:50%;background:linear-gradient(135deg,rgba(22,119,255,.16),rgba(21,198,255,.06));filter:blur(.2px)}
.hero-inner{max-width:1240px;margin:0 auto;padding:48px 28px;display:grid;grid-template-columns:1fr 300px;gap:36px;align-items:center;position:relative}
.kicker{font-size:18px;font-weight:900;color:#12305f;margin-bottom:14px}.hero h1{font-size:42px;line-height:1.15;margin:0 0 18px;letter-spacing:-.035em}.hero h1 span{color:var(--blue)}.hero p{font-size:17px;line-height:1.85;color:#52647f;max-width:710px;margin:0}.stats{display:flex;gap:32px;margin-top:26px;flex-wrap:wrap}.stat{display:flex;align-items:center;gap:12px;padding-right:26px;border-right:1px solid #d8e7ff}.stat b{font-size:30px;color:var(--blue)}.stat small{color:#61738f;font-weight:700}
.ai-cube{height:210px;border-radius:24px;background:rgba(255,255,255,.78);border:1px solid rgba(255,255,255,.9);box-shadow:var(--shadow);display:grid;place-items:center;position:relative;overflow:hidden}.ai-cube:before{content:"";width:120px;height:120px;border-radius:28px;background:linear-gradient(145deg,#0b66ff,#22d3ee);box-shadow:0 30px 60px rgba(22,119,255,.35);transform:rotateX(55deg) rotateZ(45deg)}.ai-cube:after{content:"AI";position:absolute;font-size:54px;color:#fff;font-weight:900;text-shadow:0 6px 20px rgba(0,0,0,.18)}
.wrap{max-width:1240px;margin:0 auto;padding:34px 28px 58px}.section-head{display:flex;align-items:center;justify-content:space-between;margin:0 0 18px}.section-title{display:flex;align-items:center;gap:12px;font-size:24px;font-weight:900}.icon-grid{width:26px;height:26px;border-radius:8px;background:linear-gradient(135deg,var(--blue),var(--cyan));box-shadow:0 8px 20px rgba(22,119,255,.22)}
.search{width:260px;height:42px;border:1px solid var(--line);border-radius:12px;background:#fff;padding:0 16px;color:#72839b;box-shadow:0 8px 24px rgba(49,96,165,.06)}
.main-grid{display:grid;grid-template-columns:1fr 270px;gap:28px}.category-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.cat-card{background:rgba(255,255,255,.88);border:1px solid var(--line);border-radius:20px;padding:20px;box-shadow:0 14px 42px rgba(32,96,180,.08);transition:.25s;position:relative;overflow:hidden}.cat-card:before{content:"";position:absolute;inset:0;background:linear-gradient(135deg,rgba(22,119,255,.08),transparent 42%);opacity:0;transition:.25s}.cat-card:hover{transform:translateY(-4px);box-shadow:0 20px 54px rgba(22,119,255,.16);border-color:#bad7ff}.cat-card:hover:before{opacity:1}.cat-top{display:flex;align-items:center;gap:13px;margin-bottom:16px;position:relative}.cat-icon{width:54px;height:54px;border-radius:16px;display:grid;place-items:center;font-size:25px;background:linear-gradient(135deg,#eaf3ff,#d8eaff)}.cat-card h3{margin:0;font-size:18px}.cat-card small{color:#64748b;font-weight:800}.tool-list{display:grid;gap:8px;position:relative}.tool-item{height:38px;display:flex;align-items:center;gap:10px;border-radius:10px;padding:0 9px;background:rgba(248,251,255,.7);border:1px solid #edf4ff;color:#20334f;font-size:13px;font-weight:700;transition:.2s}.tool-item:hover{background:#eef6ff;border-color:#b7d5ff;color:var(--blue)}.num{width:28px;height:24px;border-radius:8px;background:#eef6ff;color:var(--blue);display:grid;place-items:center;font-size:12px;font-weight:900}.arr{margin-left:auto;color:var(--blue)}
.side{display:grid;gap:18px}.side-card{background:rgba(255,255,255,.88);border:1px solid var(--line);border-radius:20px;padding:22px;box-shadow:0 14px 42px rgba(32,96,180,.08)}.side-card h3{margin:0 0 18px;font-size:18px}.feature{display:flex;gap:12px;margin-bottom:20px}.feature i{width:38px;height:38px;border-radius:14px;background:#eaf3ff;color:var(--blue);display:grid;place-items:center;font-style:normal;font-weight:900}.feature b{display:block;font-size:14px;margin-bottom:4px}.feature span{font-size:12px;color:#66758d;line-height:1.6}.cta{background:linear-gradient(135deg,#f9fcff,#eaf3ff);border:1px solid #dbeafe}.cta .btn{display:block;text-align:center;background:linear-gradient(135deg,var(--blue),var(--blue2));color:white;padding:14px;border-radius:12px;font-weight:900;margin-top:14px}
.bottom-benefits{margin-top:26px;background:rgba(255,255,255,.9);border:1px solid var(--line);border-radius:20px;box-shadow:0 14px 42px rgba(32,96,180,.08);display:grid;grid-template-columns:repeat(4,1fr);overflow:hidden}.benefit{padding:20px 24px;display:flex;align-items:center;gap:12px;border-right:1px solid var(--line)}.benefit:last-child{border-right:0}.benefit i{width:42px;height:42px;border-radius:50%;border:1px solid #cfe2ff;display:grid;place-items:center;color:var(--blue);font-style:normal}.benefit b{display:block}.benefit span{font-size:12px;color:#64748b}
.tool-hero{max-width:1120px;margin:0 auto;padding:34px 24px 12px}.breadcrumb{font-size:13px;color:#64748b;margin-bottom:16px}.tool-panel{max-width:1120px;margin:0 auto;padding:14px 24px 60px;display:grid;grid-template-columns:1fr 310px;gap:22px}.quiz-card,.result-card,.guide-card{background:#fff;border:1px solid var(--line);border-radius:22px;box-shadow:var(--shadow);padding:26px}.progress{height:8px;background:#e6efff;border-radius:99px;overflow:hidden;margin:0 0 22px}.progress i{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--blue),var(--cyan));transition:.3s}.q-meta{font-size:13px;color:var(--blue);font-weight:900;letter-spacing:.06em}.q-title{font-size:25px;margin:12px 0 8px}.q-hint{font-size:14px;color:#64748b;line-height:1.7}.options{display:grid;gap:12px;margin-top:20px}.opt{border:1px solid var(--line);background:#fff;border-radius:16px;padding:16px;display:flex;gap:12px;text-align:left;cursor:pointer;transition:.2s}.opt:hover,.opt.selected{border-color:var(--blue);background:#f5faff;box-shadow:0 12px 28px rgba(22,119,255,.10)}.radio{width:18px;height:18px;border:2px solid #c9ddfb;border-radius:50%;margin-top:2px;flex:0 0 auto}.selected .radio{border:5px solid var(--blue)}.opt b{display:block;font-size:15px;margin-bottom:4px}.opt span{font-size:13px;color:#64748b;line-height:1.5}.actions{display:flex;justify-content:space-between;margin-top:22px}.btn{border:0;border-radius:12px;padding:13px 22px;font-weight:900;cursor:pointer}.btn-main{background:linear-gradient(135deg,var(--blue),var(--blue2));color:#fff;box-shadow:0 12px 26px rgba(22,119,255,.22)}.btn-ghost{background:#fff;border:1px solid var(--line);color:#52647f}.btn:disabled{opacity:.45;cursor:not-allowed;box-shadow:none}.steps{display:grid;gap:9px}.step{display:flex;gap:10px;align-items:center;font-size:13px;color:#66758d}.step i{width:24px;height:24px;border-radius:9px;background:#eef6ff;color:#7b8fae;display:grid;place-items:center;font-style:normal;font-size:12px}.step.active{color:var(--blue);font-weight:900}.step.done i,.step.active i{background:var(--blue);color:#fff}.guide-card h3{margin-top:0}.guide-card p,.guide-card li{font-size:13px;color:#64748b;line-height:1.75}.result-card{display:none}.result-card h2{font-size:27px;margin:0 0 8px}.summary{color:#61738f;line-height:1.8}.score{display:flex;align-items:end;gap:12px;margin:18px 0}.score strong{font-size:48px;color:var(--blue);line-height:1}.res-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;margin:18px 0}.res-box{border:1px solid var(--line);border-radius:16px;padding:16px;background:#fbfdff}.res-box small{display:block;color:var(--blue);font-weight:900;margin-bottom:7px}.res-box b{font-size:17px}.list{display:grid;gap:10px;margin:14px 0}.list div{border:1px solid var(--line);border-left:4px solid var(--blue);background:#fff;border-radius:14px;padding:13px 15px;color:#334155;line-height:1.65}.footer{padding:30px;text-align:center;color:#7789a3;background:#fff;border-top:1px solid var(--line);font-size:13px}
@media(max-width:980px){.hero-inner,.main-grid,.tool-panel{grid-template-columns:1fr}.category-grid{grid-template-columns:1fr 1fr}.side{grid-row:auto}.bottom-benefits{grid-template-columns:1fr 1fr}.topbar{padding:0 20px}.nav{display:none}}
@media(max-width:620px){.category-grid,.res-grid,.bottom-benefits{grid-template-columns:1fr}.hero h1{font-size:32px}.stats{gap:14px}.stat{border-right:0}.ai-cube{display:none}}