:root{--primary:#286BDC;--primary-dark:#1d59bd;--bg:#F6F8FC;--surface:#FFFFFF;--text:#1D2129;--muted:#5d6b80;--border:#e3e8f0;--radius:10px}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--surface);color:var(--text);font:16px/1.7 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue","PingFang SC","Microsoft YaHei",sans-serif}
a{color:var(--primary);text-decoration:none}h1,h2,h3{line-height:1.3;margin:0;font-weight:600}p{margin:0}
.wrap{max-width:1160px;margin:0 auto;padding:0 16px}
.site-header{position:sticky;top:0;z-index:10;background:rgba(255,255,255,.94);backdrop-filter:blur(8px);border-bottom:1px solid var(--border)}
.header-row{display:flex;align-items:center;justify-content:space-between;height:64px;gap:16px}
.brand{display:flex;align-items:center;gap:10px;color:var(--text);font-weight:600;font-size:18px;white-space:nowrap}.brand img{display:block;max-width:160px;object-fit:contain}
.mark{width:34px;height:34px;object-fit:contain;display:block}
.header-nav{display:flex;align-items:center;gap:22px;font-size:15px}.header-nav a:not(.btn){color:var(--muted)}.header-nav a:not(.btn):hover{color:var(--primary)}
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:0 22px;border-radius:8px;font-weight:500;font-size:15px;border:1px solid transparent;white-space:nowrap}
.btn.primary{background:var(--primary);color:#fff}.btn.primary:hover{background:var(--primary-dark)}
.btn.secondary{background:#fff;color:var(--primary);border-color:#bcd2f5}.btn.secondary:hover{background:#f3f7fe}
.btn.ghost{min-height:36px;padding:0 16px;border-color:var(--border);color:var(--text)}
.hero{background:linear-gradient(180deg,#eef4fd 0%,#F6F8FC 100%);padding:72px 0 80px}
.hero-grid{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(0,1fr);gap:56px;align-items:center}
.eyebrow{color:var(--primary);font-weight:600;letter-spacing:.08em;font-size:13px;margin-bottom:12px}
.hero h1{font-size:42px;letter-spacing:-.01em}.lead{margin-top:18px;font-size:18px;color:var(--muted);max-width:620px}
.cta-row{display:flex;gap:12px;flex-wrap:wrap;margin-top:30px}.note{margin-top:14px;font-size:13px;color:var(--muted)}
.hero-card{background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:26px;box-shadow:0 12px 40px rgba(40,107,220,.08)}
.mock-row{display:flex;justify-content:space-between;font-size:14px;color:var(--muted);margin-top:14px}.mock-row:first-child{margin-top:0}.mock-row strong{color:var(--text);font-weight:600}
.mock-bar{height:10px;border-radius:99px;background:#eef2f8;margin-top:8px;overflow:hidden}.mock-bar i{display:block;height:100%;background:var(--primary);border-radius:99px}.mock-bar.warn i{background:#e8a33d}
.section{padding:72px 0}.section.alt{background:var(--bg)}.section h2{font-size:28px;margin-bottom:32px}
.grid4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px}.grid2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}
.grid4 article,.grid2 article{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:22px}
.grid4 h3,.grid2 h3{font-size:17px;margin-bottom:8px}.grid4 p,.grid2 p{color:var(--muted);font-size:15px}
.steps{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px;counter-reset:s}
.steps li{counter-increment:s;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:22px;display:flex;flex-direction:column;gap:6px}
.steps li::before{content:counter(s);width:30px;height:30px;border-radius:50%;background:#eef4fd;color:var(--primary);font-weight:600;display:flex;align-items:center;justify-content:center;margin-bottom:6px}
.steps span{color:var(--muted);font-size:15px}
.site-footer{border-top:1px solid var(--border);padding:22px 0;font-size:14px;color:var(--muted)}.footer-row{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}
@media(max-width:900px){.hero-grid{grid-template-columns:minmax(0,1fr)}.grid4,.steps{grid-template-columns:repeat(2,minmax(0,1fr))}.hero{padding:48px 0 56px}.hero h1{font-size:32px}}
@media(max-width:620px){.header-nav a:not(.btn){display:none}.grid4,.grid2,.steps{grid-template-columns:minmax(0,1fr)}.section{padding:48px 0}.section h2{font-size:23px;margin-bottom:22px}.hero h1{font-size:27px}.lead{font-size:16px}.cta-row .btn{flex:1 1 100%}}
.demo-links{display:flex;gap:22px;flex-wrap:wrap;margin-top:18px;font-size:15px;font-weight:500}
.section-head{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;margin-bottom:32px}.section-head h2{margin:0}
.auth-card{background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:26px 26px 22px;box-shadow:0 12px 40px rgba(40,107,220,.10)}
.auth-card h2{font-size:24px;margin-bottom:4px}.auth-sub{color:var(--muted);font-size:14px;margin:4px 0 16px}.auth-note{color:var(--muted);font-size:14px;margin:8px 0}
.auth-tabs{display:flex;gap:22px;border-bottom:1px solid var(--border);margin-bottom:8px}.auth-tabs button{background:none;border:0;padding:0 0 10px;font-family:inherit;font-weight:600;font-size:20px;line-height:1.3;color:var(--muted);cursor:pointer;border-bottom:2px solid transparent;margin-bottom:-1px}.auth-tabs button[aria-selected=true]{color:var(--text);border-color:var(--primary)}
.auth-pane{display:flex;flex-direction:column;gap:12px}.auth-pane[hidden]{display:none}
.auth-pane input:not([type=checkbox]):not([type=radio]){width:100%;min-height:46px;border:1px solid transparent;background:#f1f3f7;border-radius:6px;padding:0 14px;font-size:15px;color:var(--text);outline:none}
.auth-pane input:not([type=checkbox]):not([type=radio]):focus{background:#fff;border-color:var(--primary);box-shadow:0 0 0 2px #286BDC1f}
.role-pick{display:flex;gap:26px;font-size:16px}.role-pick label{display:inline-flex;align-items:center;gap:7px;cursor:pointer}.role-pick input{width:18px;height:18px;accent-color:var(--primary)}.role-pick label.off{color:#b3bac6;cursor:not-allowed}
.captcha-line{display:grid;grid-template-columns:minmax(0,1fr) 132px;gap:8px;align-items:center}.captcha-img{width:132px;height:46px;object-fit:cover;border-radius:6px;cursor:pointer;background:#f1f3f7}
.agree{display:flex;align-items:center;gap:7px;font-size:14px;color:var(--muted)}.agree input{width:16px;height:16px;accent-color:var(--primary)}
.btn.block{width:100%;min-height:46px}.auth-error{color:#9c2e33;background:#fdf0f0;border:1px solid #f1cbcd;border-radius:6px;padding:9px 12px;font-size:14px;margin:8px 0 2px}
.agreement{max-width:820px}.agreement h1{font-size:28px;margin-bottom:18px}.agreement-text h2{font-size:17px;margin:22px 0 8px}.agreement-text p{color:var(--muted);margin:0 0 10px}
@media(max-width:900px){.auth-card{max-width:520px}}