:root{
  --c-text:#1e232c;
  --c-text-bluish:#152443;
  --c-desc:rgba(0,0,0,.65);
  --c-secondary:rgba(0,0,0,.7);
  --c-brand:#4d6bfe;
  --c-brand-deep:#3a65c2;
  --c-brand-mid:#4176e6;
  --c-page:#f9f8f8;
  --c-surface-1:hsla(0,0%,100%,.3);
  --c-surface-2:rgba(0,0,0,.03);
  --c-surface-raised:hsla(0,0%,100%,.45);
  --c-border-subtle:rgba(0,0,0,.06);
  --c-border-default:rgba(0,0,0,.1);
  --c-border-divider:rgba(0,0,0,.08);
  --c-hover:rgba(0,0,0,.04);
  --radius-pill:100px;
  --radius-card:24px;
  --radius-panel:16px;
  --radius-media:12px;
  --radius-sm:8px;
  --s1:4px;--s2:8px;--s3:12px;--s4:16px;--s5:24px;--s6:32px;--s7:40px;--s8:56px;--s9:80px;
  --blur:12px;
  --shadow-card:0 0 0 1px #f1f5f9,0 2px 4px rgba(0,0,0,.05),0 12px 24px rgba(0,0,0,.05);
  --font-sans:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
}
*,*::before,*::after{box-sizing:border-box;border:0 solid #e5e7eb}
html{line-height:1.5;-webkit-text-size-adjust:100%;-webkit-tap-highlight-color:transparent}
body{
  margin:0;font-family:var(--font-sans);color:var(--c-text);background:var(--c-page);
  min-height:100vh;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;
  overscroll-behavior:none;overflow-x:hidden;
}
h1,h2,h3,h4,h5,h6,p,figure,blockquote,dl,dd{margin:0}
h1,h2,h3,h4,h5,h6{font-size:inherit;font-weight:inherit}
ul,ol,menu{margin:0;padding:0;list-style:none}
a{color:inherit;text-decoration:none}
img,svg{display:block;vertical-align:middle;max-width:100%;height:auto}
button{font-family:inherit;font-size:100%;font-weight:inherit;line-height:inherit;color:inherit;margin:0;padding:0;background:transparent;background-image:none;cursor:pointer;text-transform:none}
.container{width:min(100% - 48px,1140px);margin-inline:auto}
@media (min-width:768px){.container{width:min(100% - 144px,1140px)}}
@media (min-width:1560px){.container{width:min(100% - 160px,1280px)}}

/* ---------- header ---------- */
.site-header{position:fixed;top:0;left:0;right:0;margin:0 auto;z-index:50;width:min(100% - 48px,1140px);padding:var(--s2) 0 0}
@media (min-width:768px){.site-header{width:min(100% - 144px,1140px)}}
@media (min-width:1560px){.site-header{width:min(100% - 160px,1280px)}}
.header-bar{display:flex;align-items:center;justify-content:space-between;margin:0 auto;padding:6px 14px;border-radius:var(--radius-pill);border:1px solid transparent;background:transparent;transition:background-color .3s ease,border-color .3s ease,backdrop-filter .3s ease}
.header-bar.is-scrolled{background:var(--c-surface-raised);backdrop-filter:blur(var(--blur));-webkit-backdrop-filter:blur(var(--blur));border-color:var(--c-border-default)}
.brand{display:flex;align-items:center;gap:10px;flex-shrink:0}
.brand-mark{width:34px;height:34px;border-radius:10px;background:linear-gradient(145deg,#679efe 0%,#4d6bfe 60%,#3a65c2 100%);display:flex;align-items:center;justify-content:center;color:#fff;font-size:15px;font-weight:700;letter-spacing:.02em;box-shadow:0 4px 10px rgba(77,107,254,.28)}
.brand-name{font-size:16px;font-weight:600;color:var(--c-brand-mid);letter-spacing:.01em}
.header-nav{display:none;align-items:center;gap:var(--s5)}
@media (min-width:768px){.header-nav{display:flex}}
.nav-link{font-size:15px;color:var(--c-secondary);padding:6px 2px;transition:color .2s}
.nav-link:hover{color:var(--c-brand-mid)}
.btn{position:relative;display:inline-flex;align-items:center;justify-content:center;gap:var(--s2);border-radius:var(--radius-pill);box-sizing:border-box;font-weight:500;line-height:120%;text-decoration:none;cursor:pointer;overflow:hidden;isolation:isolate;transition:border-color .35s ease,background-color .2s ease}
.btn-ghost{background:transparent;color:var(--c-text);border:1px solid transparent;font-weight:400;transition:border-color .2s,background-color .2s}
.btn-ghost:hover{background:var(--c-hover);border-color:rgba(9,45,78,.2)}
.btn-secondary{background:hsla(0,0%,100%,.4);color:var(--c-text);border:1px solid rgba(9,45,78,.18);backdrop-filter:blur(var(--blur));-webkit-backdrop-filter:blur(var(--blur))}
.btn-secondary:hover{border-color:rgba(9,45,78,.36)}
.btn-primary{background:var(--c-brand-deep);color:#fff;border:1px solid transparent}
.btn-primary:hover{background:#31599f}
.btn-m{font-size:15px;padding:11px 18px}
.btn-s{font-size:14px;padding:var(--s2) var(--s3)}
.menu-toggle{display:flex;align-items:center;justify-content:center;width:40px;height:40px;border-radius:var(--radius-sm);color:var(--c-text)}
@media (min-width:768px){.menu-toggle{display:none}}
.mobile-menu{position:fixed;inset:0;z-index:9990;background:var(--c-page);display:flex;flex-direction:column;opacity:0;pointer-events:none;transition:opacity .2s ease}
.mobile-menu.is-open{opacity:1;pointer-events:auto}
.mobile-menu-header{display:flex;align-items:center;justify-content:space-between;padding:12px var(--s5);border:1px solid transparent}
.mobile-menu-body{flex:1;overflow-y:auto;padding:var(--s3) var(--s5)}
.mobile-menu-item{display:flex;align-items:center;padding:var(--s5) 0;border-bottom:1px solid var(--c-border-divider);font-size:18px;font-weight:500;color:var(--c-text)}

/* ---------- hero ---------- */
.hero{position:relative;display:flex;flex-direction:column;align-items:center;justify-content:center;overflow:hidden;width:100%;min-height:min(100vh,940px);min-height:min(100svh,940px);padding-bottom:var(--s6);background:linear-gradient(180deg,#b9d3ed 0%,rgba(249,248,248,0) 100%)}
.hero-grid-bg{position:absolute;inset:0;z-index:0;overflow:hidden;pointer-events:none;background-image:linear-gradient(rgba(255,255,255,.55) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.55) 1px,transparent 1px);background-size:56px 56px;mask:linear-gradient(#000 0%,rgba(0,0,0,.75) 30%,transparent 100%);-webkit-mask:linear-gradient(#000 0%,rgba(0,0,0,.75) 30%,transparent 100%)}
.hero-glow{position:absolute;z-index:0;width:620px;height:620px;left:50%;top:-240px;transform:translateX(-50%);border-radius:50%;background:radial-gradient(circle,rgba(77,107,254,.28) 0%,rgba(77,107,254,0) 70%);pointer-events:none}
.hero-inner{position:relative;z-index:10;display:flex;flex-direction:column;align-items:center;width:100%;max-width:1080px;padding:104px 24px 0;gap:34px}
.hero-head{display:flex;flex-direction:column;align-items:center;gap:24px;width:100%}
.hero-notice{display:inline-flex;align-items:flex-start;gap:8px;max-width:640px;font-size:15px;line-height:1.6;text-align:center;color:var(--c-text)}
.hero-notice .dot{flex-shrink:0;width:7px;height:7px;border-radius:50%;background:var(--c-brand);margin-top:9px;box-shadow:0 0 0 4px rgba(77,107,254,.15)}
.hero-notice span{color:var(--c-desc)}
h1.hero-title{font-size:36px;font-weight:600;line-height:1.35;letter-spacing:.06em;color:var(--c-text-bluish);text-align:center;max-width:900px}
h1.hero-title em{font-style:normal;color:var(--c-brand);position:relative;white-space:nowrap}
h1.hero-title em::after{content:"";position:absolute;left:0;right:0;bottom:-4px;height:6px;border-radius:6px;background:linear-gradient(90deg,rgba(77,107,254,.35),rgba(77,107,254,.05))}
@media (min-width:768px){h1.hero-title{font-size:44px;letter-spacing:.08em}}
@media (min-width:1024px){h1.hero-title{font-size:48px;letter-spacing:.12em}}
.hero-sub{max-width:660px;text-align:center;font-size:16px;line-height:1.75;color:var(--c-desc)}

/* hero card: 模拟输入区 + 状态面板 */
.hero-panel-wrap{display:flex;flex-direction:column;align-items:center;width:100%;max-width:880px;gap:var(--s7)}
.glass-card{background:var(--c-surface-1);border:1px solid var(--c-border-subtle);border-radius:var(--radius-card);backdrop-filter:blur(var(--blur));-webkit-backdrop-filter:blur(var(--blur))}
.hero-panel{width:100%;padding:18px 18px 16px;display:flex;flex-direction:column;gap:14px;border-width:2px;box-shadow:0 10px 30px rgba(30,35,44,.06)}
.hero-panel-title{display:flex;align-items:center;gap:10px;font-size:14px;font-weight:500;color:var(--c-text)}
.status-pill{display:inline-flex;align-items:center;gap:6px;font-size:12px;font-weight:500;padding:4px 10px;border-radius:var(--radius-pill);background:rgba(34,197,94,.12);color:#16794a;border:1px solid rgba(34,197,94,.25)}
.status-pill i{width:6px;height:6px;border-radius:50%;background:#22c55e;display:block}
.hero-panel-body{display:grid;grid-template-columns:1fr;gap:12px}
@media (min-width:560px){.hero-panel-body{grid-template-columns:repeat(2,minmax(0,1fr))}}
.panel-field{border:1px solid var(--c-border-default);border-radius:var(--radius-media);padding:12px 14px;background:hsla(0,0%,100%,.5)}
.panel-field .k{font-size:12px;color:var(--c-desc);letter-spacing:.04em}
.panel-field .v{font-size:14px;color:var(--c-text);margin-top:4px;word-break:break-all}
.panel-field .v.ok{color:#16794a;font-weight:500}
.hero-panel-foot{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;padding-top:4px;border-top:1px solid var(--c-border-divider)}
.toggle-row{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.hero-toggle{border:1px solid var(--c-border-default);background:transparent;color:var(--c-text);height:34px;padding:0 12px;border-radius:18px;font-size:13px;font-weight:500;display:inline-flex;align-items:center;gap:6px;transition:background .2s,border-color .2s,color .2s}
.hero-toggle:hover{background:var(--c-hover)}
.hero-toggle.is-selected{background:rgba(65,118,230,.12);color:var(--c-brand-mid);border-color:rgba(65,118,230,.3)}
.hero-toggle.is-selected:hover{background:rgba(65,118,230,.18)}
.hero-send{flex-shrink:0;display:flex;align-items:center;justify-content:center;width:38px;height:38px;border-radius:50%;background:var(--c-brand-mid);color:#fff;transition:background .2s}
.hero-send:hover{background:#31599f}
.hero-actions{display:grid;grid-template-columns:1fr;width:100%;max-width:100%;gap:var(--s4)}
@media (min-width:560px){.hero-actions{display:flex;flex-wrap:nowrap;align-items:center;justify-content:center;gap:var(--s4);width:max-content}}
.hero-actions .btn{width:100%}
@media (min-width:560px){.hero-actions .btn{width:auto;padding-left:18px;padding-right:18px}}
.btn svg{width:16px;height:16px;flex-shrink:0}

/* ---------- 通用区块 ---------- */
.section{padding:var(--s9) 0}
.section-head{max-width:720px;margin:0 auto var(--s7);text-align:center;display:flex;flex-direction:column;gap:14px;align-items:center}
.eyebrow{font-size:13px;letter-spacing:.18em;color:var(--c-brand);font-weight:500}
.section-title{font-size:28px;font-weight:600;line-height:1.4;color:var(--c-text-bluish)}
@media (min-width:768px){.section-title{font-size:34px}}
.section-desc{font-size:15px;line-height:1.8;color:var(--c-desc)}

/* 三栏特性 */
.feature-grid{display:grid;grid-template-columns:1fr;gap:var(--s5)}
@media (min-width:768px){.feature-grid{grid-template-columns:repeat(3,minmax(0,1fr))}}
.feature-card{background:#fff;border:1px solid var(--c-border-subtle);border-radius:var(--radius-panel);padding:26px 22px;box-shadow:var(--shadow-card);display:flex;flex-direction:column;gap:14px}
.feature-visual{height:92px;border-radius:var(--radius-media);position:relative;overflow:hidden;display:flex;align-items:center;justify-content:center}
.feature-visual.v1{background:linear-gradient(135deg,#dbeafe 0%,#eaf3ff 60%,#f5f9ff 100%)}
.feature-visual.v2{background:linear-gradient(135deg,#e4edfd 0%,#edf3fe 55%,#f6faff 100%)}
.feature-visual.v3{background:linear-gradient(135deg,#e5f0ff 0%,#eef5ff 55%,#f8fbff 100%)}
.feature-visual .bubble{width:56px;height:56px;border-radius:16px;background:rgba(77,107,254,.18);border:1px solid rgba(77,107,254,.28);display:flex;align-items:center;justify-content:center;color:var(--c-brand-deep);font-weight:700;font-size:19px}
.feature-visual .bubble.round{border-radius:50%}
.feature-visual .bubble.square{border-radius:12px;transform:rotate(-8deg)}
.feature-card h3{font-size:18px;font-weight:600;color:var(--c-text)}
.feature-card p{font-size:14px;line-height:1.8;color:var(--c-desc)}

/* 左文右图 */
.split{display:grid;grid-template-columns:1fr;gap:var(--s7);align-items:center}
@media (min-width:1024px){.split{grid-template-columns:1.05fr .95fr;gap:var(--s9)}}
.split-text{display:flex;flex-direction:column;gap:18px}
.split-text .section-title{text-align:left}
.split-text p{font-size:15px;line-height:1.85;color:var(--c-desc)}
.step-list{display:flex;flex-direction:column;gap:14px;margin-top:6px}
.step{display:flex;gap:14px;align-items:flex-start}
.step-num{flex-shrink:0;width:28px;height:28px;border-radius:50%;background:rgba(77,107,254,.1);color:var(--c-brand-deep);font-size:13px;font-weight:600;display:flex;align-items:center;justify-content:center;border:1px solid rgba(77,107,254,.22)}
.step-body strong{display:block;font-size:15px;font-weight:600;color:var(--c-text);margin-bottom:4px}
.step-body span{font-size:14px;line-height:1.75;color:var(--c-desc)}
.split-visual{position:relative;border-radius:var(--radius-card);overflow:hidden;background:linear-gradient(160deg,#eaf1fc 0%,#f6f9ff 100%);border:1px solid var(--c-border-subtle);min-height:320px;padding:24px;display:flex;flex-direction:column;gap:14px;box-shadow:var(--shadow-card)}
.mock-row{display:flex;align-items:center;gap:12px;background:#fff;border:1px solid var(--c-border-subtle);border-radius:var(--radius-media);padding:12px 14px}
.mock-thumb{flex-shrink:0;width:52px;height:52px;border-radius:10px;background:linear-gradient(135deg,#c7dbff,#e9f2ff);display:flex;align-items:center;justify-content:center;color:var(--c-brand-deep);font-size:12px;font-weight:600}
.mock-lines{flex:1;min-width:0;display:flex;flex-direction:column;gap:6px}
.mock-lines i{display:block;height:8px;border-radius:4px;background:rgba(38,49,72,.1)}
.mock-lines i.short{width:52%}
.mock-lines i.mid{width:78%}
.mock-badge{flex-shrink:0;font-size:11px;padding:3px 8px;border-radius:var(--radius-pill);background:rgba(77,107,254,.1);color:var(--c-brand-deep);border:1px solid rgba(77,107,254,.2)}

/* FAQ 双栏 */
.faq-grid{display:grid;grid-template-columns:1fr;gap:var(--s5)}
@media (min-width:768px){.faq-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
.faq-item{background:#fff;border:1px solid var(--c-border-subtle);border-radius:var(--radius-panel);padding:20px 22px;display:flex;flex-direction:column;gap:10px}
.faq-item h3{font-size:16px;font-weight:600;color:var(--c-text);display:flex;gap:10px;align-items:flex-start}
.faq-item h3::before{content:"Q";flex-shrink:0;width:22px;height:22px;border-radius:6px;background:rgba(77,107,254,.1);color:var(--c-brand-deep);font-size:12px;display:flex;align-items:center;justify-content:center;font-weight:700}
.faq-item p{font-size:14px;line-height:1.8;color:var(--c-desc);padding-left:32px}

/* CTA */
.cta{background:linear-gradient(180deg,rgba(234,241,252,0) 0%,#eaf1fc 100%);padding:var(--s9) 0}
.cta-inner{display:flex;flex-direction:column;align-items:center;gap:20px;text-align:center}
.cta-inner h2{font-size:26px;font-weight:600;color:var(--c-text-bluish)}
@media (min-width:768px){.cta-inner h2{font-size:32px}}
.cta-inner p{font-size:15px;line-height:1.8;color:var(--c-desc);max-width:560px}
.cta-actions{display:flex;flex-wrap:wrap;gap:var(--s4);justify-content:center}

/* ---------- footer ---------- */
.site-footer{width:100%;overflow:hidden;padding:var(--s9) 0 32px;border-top:1px solid var(--c-border-subtle)}
.footer-inner{display:flex;flex-direction:column;gap:var(--s7)}
.footer-top{display:flex;flex-direction:column;gap:var(--s7)}
@media (min-width:768px){.footer-top{flex-direction:row;align-items:flex-start;justify-content:space-between}}
.footer-brand{display:flex;flex-direction:column;gap:12px;max-width:300px}
.footer-brand .brand-name{font-size:16px}
.footer-brand p{font-size:13px;line-height:1.75;color:var(--c-desc)}
.footer-cols{display:flex;flex-wrap:wrap;gap:var(--s7) var(--s9)}
.footer-col{display:flex;flex-direction:column;gap:14px;min-width:110px}
.footer-col p{font-size:13px;font-weight:500;color:var(--c-text);margin:0}
.footer-col a{font-size:13px;color:var(--c-desc);transition:color .2s}
.footer-col a:hover{color:var(--c-brand-mid)}
.footer-bottom{display:flex;flex-direction:column;gap:10px;padding-top:var(--s5);border-top:1px solid var(--c-border-subtle);font-size:12px;color:rgba(0,0,0,.45);line-height:1.8}
@media (min-width:768px){.footer-bottom{flex-direction:row;align-items:center;justify-content:space-between;flex-wrap:wrap}}
.footer-bottom a{color:rgba(0,0,0,.45);text-decoration:none}
.footer-bottom a:hover{color:var(--c-brand-mid)}
.footer-updated{font-size:12px;color:rgba(0,0,0,.4)}