:root{--bg:#f6f7fc;--surface:#fff;--ink:#0e1226;--muted:#5c657d;--line:#e7eaf3;--blue:#4f6df5;--violet:#8b5cf6;--grad:linear-gradient(135deg,#4f6df5,#8b5cf6);--r-lg:22px;--r-md:16px;--pill:999px;--shadow:0 12px 40px rgba(79,109,245,.1)}*{box-sizing:border-box}body{margin:0;font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--ink);-webkit-font-smoothing:antialiased}a{color:inherit}.wrap{max-width:1160px;margin:0 auto;padding:0 24px}.topnav{position:-webkit-sticky;position:sticky;top:0;z-index:50;-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);background:hsla(0,0%,100%,.82);border-bottom:1px solid var(--line)}.topnav-inner{max-width:1160px;margin:0 auto;padding:14px 24px;display:flex;align-items:center;justify-content:space-between}.logo{font-weight:800;font-size:21px;letter-spacing:-.5px;text-decoration:none}.logo span{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}.nav-links{display:flex;gap:26px;align-items:center;font-size:15px}.nav-links a{text-decoration:none;color:var(--muted);font-weight:500}.nav-links a:hover{color:var(--ink)}.btn{display:inline-block;border:none;cursor:pointer;font-weight:700;font-size:15px;padding:13px 28px;border-radius:var(--pill);text-decoration:none;transition:transform .12s ease,box-shadow .12s ease}.btn-primary{background:var(--grad);color:#fff;box-shadow:0 8px 24px rgba(99,102,241,.35)}.btn-primary:hover{transform:translateY(-1px);box-shadow:0 12px 28px rgba(99,102,241,.42)}.btn-ghost{background:#fff;color:var(--ink);border:1px solid var(--line)}.btn-ghost:hover{border-color:#c9d2f2}.btn-sm{padding:9px 20px;font-size:14px}.btn:disabled{opacity:.55;cursor:default;transform:none}.hero{text-align:center;padding:84px 24px 40px;max-width:860px;margin:0 auto}.hero h1{font-size:clamp(38px,5.4vw,62px);line-height:1.08;letter-spacing:-1.8px;margin:0 0 18px;font-weight:800}.hero h1 .grad{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}.hero p.sub{font-size:18px;color:var(--muted);line-height:1.65;margin:0 0 30px}.hero-cta{gap:14px}.hero-badges,.hero-cta{display:flex;justify-content:center;flex-wrap:wrap}.hero-badges{gap:10px;margin-top:26px}.pill-badge{font-size:13px;font-weight:600;color:var(--muted);background:#fff;border:1px solid var(--line);border-radius:var(--pill);padding:7px 15px}.product{max-width:1020px;margin:26px auto 0;padding:0 24px}.product-card{background:var(--surface);border:1px solid var(--line);border-radius:28px;box-shadow:var(--shadow);overflow:hidden}.product-head{padding:22px 28px;border-bottom:1px solid var(--line);display:flex;align-items:center;gap:10px}.dot{width:12px;height:12px;border-radius:50%}.product-body{padding:30px 28px}.dropzone{border:2px dashed #c3cbf3;border-radius:var(--r-lg);padding:52px 24px;text-align:center;background:linear-gradient(180deg,#fbfbff,#f4f6ff);cursor:pointer;transition:border-color .15s ease}.dropzone:hover{border-color:var(--blue)}.dropzone h3{margin:0 0 8px;font-size:21px;letter-spacing:-.4px}.dropzone p{color:var(--muted);margin:6px 0;font-size:14.5px}.grid-2{display:grid;grid-template-columns:1fr 1.25fr;grid-gap:22px;gap:22px}@media (max-width:860px){.grid-2{grid-template-columns:1fr}}.panel{background:#fbfcff;border:1px solid var(--line);border-radius:var(--r-lg);padding:24px}.panel h3{margin:0 0 12px;font-size:17px;letter-spacing:-.3px}.summary-text{white-space:pre-wrap;color:#2a3048;line-height:1.7;font-size:14.5px}.chip-row{display:flex;gap:8px;flex-wrap:wrap;margin-top:14px}.chip{border:1px solid var(--line);background:#fff;border-radius:var(--pill);padding:8px 15px;font-size:13.5px;cursor:pointer;font-weight:500}.chip:hover{border-color:var(--blue);color:var(--blue)}.chat-list{display:flex;flex-direction:column;gap:12px;max-height:420px;overflow-y:auto}.msg{padding:13px 16px;border-radius:var(--r-md);font-size:14.5px;line-height:1.65}.msg-user{background:#eef1ff;align-self:flex-end;max-width:88%}.msg-bot{background:#fff;border:1px solid var(--line);align-self:flex-start;max-width:94%}.cite{font-size:13px;margin-top:8px;border-left:3px solid var(--blue);padding-left:10px;color:var(--muted)}.mode-tag{font-size:12px;color:#9aa3bd;margin-top:6px}.chat-input-row{display:flex;gap:10px;margin-top:16px}.input{flex:1 1;padding:13px 18px;border:1px solid var(--line);border-radius:var(--pill);font-size:15px;outline:none;background:#fff}.input:focus{border-color:var(--blue);box-shadow:0 0 0 3px rgba(79,109,245,.12)}.section{max-width:1160px;margin:0 auto;padding:72px 24px 8px}.section h2{font-size:clamp(28px,3.4vw,40px);letter-spacing:-1px;text-align:center;margin:0 0 14px;font-weight:800}.section p.lead{text-align:center;color:var(--muted);font-size:17px;margin:0 0 40px}.cards-3{display:grid;grid-template-columns:repeat(3,1fr);grid-gap:20px;gap:20px}@media (max-width:860px){.cards-3{grid-template-columns:1fr}}.fcard{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);padding:30px 26px;box-shadow:0 6px 24px rgba(20,30,80,.05)}.fcard .icon{width:46px;height:46px;border-radius:14px;background:var(--grad);display:flex;align-items:center;justify-content:center;font-size:22px;margin-bottom:16px}.fcard h3{margin:0 0 10px;font-size:18px;letter-spacing:-.3px}.fcard p{margin:0;color:var(--muted);font-size:14.5px;line-height:1.65}.steps{display:grid;grid-template-columns:repeat(3,1fr);grid-gap:20px;gap:20px;counter-reset:step}@media (max-width:860px){.steps{grid-template-columns:1fr}}.step{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);padding:28px 24px;position:relative}.step .num{width:38px;height:38px;border-radius:50%;background:var(--grad);color:#fff;font-weight:800;display:flex;align-items:center;justify-content:center;margin-bottom:14px}.step h3{margin:0 0 8px;font-size:17px}.step p{margin:0;color:var(--muted);font-size:14.5px;line-height:1.6}.faq{max-width:760px;margin:0 auto}.faq details{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-md);padding:18px 22px;margin-bottom:12px}.faq summary{font-weight:700;cursor:pointer;font-size:15.5px}.faq p{color:var(--muted);font-size:14.5px;line-height:1.7}.pricing-grid{display:grid;grid-template-columns:repeat(3,1fr);grid-gap:22px;gap:22px;max-width:1020px;margin:0 auto;align-items:stretch}@media (max-width:900px){.pricing-grid{grid-template-columns:1fr;max-width:460px}}.plan{background:var(--surface);border:1px solid var(--line);border-radius:26px;padding:34px 30px;display:flex;flex-direction:column;position:relative}.plan.hot{border:2px solid transparent;background:linear-gradient(#fff,#fff) padding-box,var(--grad) border-box;box-shadow:var(--shadow)}.plan .tag{position:absolute;top:-15px;left:50%;transform:translateX(-50%);background:var(--grad);color:#fff;font-size:12.5px;font-weight:800;padding:6px 18px;border-radius:var(--pill);letter-spacing:.4px}.plan h3{margin:0 0 6px;font-size:19px}.plan .price{font-size:42px;font-weight:800;letter-spacing:-1.5px;margin:8px 0 2px}.plan .price span{font-size:15px;font-weight:500;color:var(--muted)}.plan ul{list-style:none;padding:0;margin:20px 0 26px;flex:1 1}.plan li{padding:8px 0;font-size:14.5px;color:#333a52;border-bottom:1px dashed #eef0f7}.plan li:last-child{border-bottom:none}.plan li:before{content:"✓";color:var(--blue);font-weight:800;margin-right:10px}.auth-card{max-width:460px;margin:60px auto;background:var(--surface);border:1px solid var(--line);border-radius:26px;padding:40px 36px;box-shadow:var(--shadow)}.auth-card h1{margin:0 0 8px;font-size:26px;letter-spacing:-.6px}.auth-card p.hint{color:var(--muted);font-size:14px;margin:0 0 22px;line-height:1.6}.auth-card .input{width:100%;margin-bottom:12px}.notice{border-radius:var(--r-md);padding:14px 18px;font-size:14.5px;margin:16px 0;line-height:1.6}.notice.warn{background:#fff8e6;border:1px solid #f0dfae;color:#7a5b00}.notice.ok{background:#e9f9ef;border:1px solid #bfe8cd;color:#14622e}.notice.err{background:#fdeeee;border:1px solid #f3c2c2;color:#8f1d1d}.link-btn{background:none;border:none;color:var(--blue);font-weight:600;cursor:pointer;font-size:14.5px;padding:0}.doc-row{background:var(--surface);border:1px solid var(--line);padding:16px 20px;border-radius:var(--r-md);margin-bottom:10px;display:flex;justify-content:space-between;align-items:center;gap:12px}.doc-row .meta{font-size:14px;color:var(--muted)}.danger{color:#c22;background:none;border:1px solid #f0c0c0;border-radius:var(--pill);padding:10px 22px;cursor:pointer;font-weight:600}.danger:hover{background:#fdf0f0}.footer{border-top:1px solid var(--line);margin-top:90px;background:#fff}.footer-inner{max-width:1160px;margin:0 auto;padding:44px 24px;display:flex;justify-content:space-between;gap:30px;flex-wrap:wrap}.footer a,.footer p{font-size:13.5px;color:var(--muted);text-decoration:none}.footer a:hover{color:var(--ink)}.footer-links{display:flex;gap:22px;flex-wrap:wrap}.legal{max-width:780px;margin:0 auto;padding:60px 24px}.legal h1{font-size:34px;letter-spacing:-.8px}.legal h2{font-size:20px;margin-top:34px}.legal li,.legal p{color:#3a4158;line-height:1.75;font-size:15px}