/* AICraft Intl · 全站共同核（W3 批次 1 · 方案甲「单一来源」）
 * 本件由 _w3-batch1-20261016/scripts/build-ui.py 生成，请勿手改 —— 改脚本重生成。
 * 来源：17 页 HK 线上底稿的【规则交集】，逐条来自页面内联 CSS，无一条新增。
 * 不在此件里的规则 = 页内私有规则，仍留在各页 <style> 里。
 */
:root{--bg:#f9fafb;--surface:#fff;--border:#e5e7eb;--border-light:#f3f4f6;--accent:#2f54eb;--accent-light:rgba(47,84,235,0.08);--accent-glow:rgba(47,84,235,0.2);--gold:var(--accent);--gold-light:var(--accent-light);--gold-glow:var(--accent-glow);--text:#111827;--text2:#6b7280;--text3:#9ca3af;--blue:#2563eb;--green:#10b981;--red:#ef4444;--purple:#7c3aed;--radius:12px;--shadow-sm:0 1px 3px rgba(0,0,0,0.06);--shadow:0 4px 16px rgba(0,0,0,0.06);--shadow-lg:0 12px 40px rgba(0,0,0,0.1);--max-w:1120px}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:system-ui,-apple-system,'Segoe UI','PingFang SC','Microsoft YaHei',sans-serif;background:var(--bg);color:var(--text);line-height:1.6;overflow-x:hidden}
.par{position:fixed;top:0;left:0;width:100%;height:100%;pointer-events:none;z-index:0;overflow:hidden}
.par div{position:absolute;border-radius:50%;animation:float 8s infinite ease-in-out;opacity:0.12}
.par div:nth-child(1){width:300px;height:300px;background:radial-gradient(circle,#2f54eb,transparent);top:10%;left:5%;animation-delay:0s;animation-duration:10s}
.par div:nth-child(2){width:200px;height:200px;background:radial-gradient(circle,#3b82f6,transparent);top:60%;left:70%;animation-delay:2s;animation-duration:8s}
.par div:nth-child(3){width:250px;height:250px;background:radial-gradient(circle,#8b5cf6,transparent);top:30%;left:40%;animation-delay:4s;animation-duration:12s}
.par div:nth-child(4){width:180px;height:180px;background:radial-gradient(circle,#10b981,transparent);top:70%;left:20%;animation-delay:6s;animation-duration:9s}
@keyframes float{0%,100%{transform:translate(0,0) scale(1)}25%{transform:translate(40px,-30px) scale(1.1)}50%{transform:translate(-20px,-60px) scale(0.9)}75%{transform:translate(-40px,20px) scale(1.05)}}
body.dark .par div{opacity:0.08}
.nav{position:sticky;width:100vw;left:0;top:0;z-index:100;background:rgba(255,255,255,0.95);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--border)}
.nav-inner{max-width:var(--max-w);margin:0 auto;padding:0 20px;display:flex;align-items:center;justify-content:space-between;height:56px}
.nav-logo{display:flex;align-items:center;gap:8px;font-weight:800;font-size:18px;text-decoration:none;color:var(--text)}
.nav-logo b{display:flex;align-items:center;justify-content:center;width:32px;height:32px;background:linear-gradient(135deg,#2f54eb,#5c7cfa);color:#fff;border-radius:8px;font-size:16px}
.nav-links{display:flex;gap:6px;align-items:center}
.nav-links a{color:var(--text2);text-decoration:none;font-size:13px;font-weight:500;padding:6px 12px;border-radius:6px;transition:all 0.15s}
.nav-links a:hover{color:var(--text);background:var(--bg)}
.nav-r{display:flex;gap:8px;align-items:center}
.nav-cta{padding:7px 16px;border-radius:20px;font-size:13px;font-weight:600;border:none;cursor:pointer;background:linear-gradient(135deg,#2f54eb,#1f3aa0);color:#fff;transition:all 0.2s;white-space:nowrap}
.nav-cta:hover{box-shadow:0 4px 16px var(--accent-glow)}
.hamburger{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:10px;background:none;border:none}
.hamburger span{display:block;width:22px;height:2px;background:var(--text);border-radius:2px;transition:all 0.2s}
.mobile-menu{display:none;position:fixed;top:56px;left:0;width:100%;background:var(--surface);border-bottom:1px solid var(--border);z-index:99;padding:12px 20px;flex-direction:column;gap:4px;box-shadow:var(--shadow-lg)}
.mobile-menu.open{display:flex}
.mobile-menu a{padding:12px 16px;border-radius:8px;color:var(--text);text-decoration:none;font-size:15px;font-weight:500}
.sec{padding:70px 20px}
.sec-inner{max-width:var(--max-w);margin:0 auto}
.sec-label{text-align:center;font-size:11px;text-transform:uppercase;letter-spacing:2px;color:var(--accent);font-weight:700;margin-bottom:8px}
.sec-title{text-align:center;font-size:clamp(22px,4vw,34px);font-weight:700;letter-spacing:-0.5px;margin-bottom:8px}
.sec-sub{text-align:center;color:var(--text2);max-width:520px;margin:0 auto;font-size:15px}
.hero{padding:80px 20px 60px;text-align:center;max-width:var(--max-w);margin:0 auto}
.hero-badge{display:inline-flex;align-items:center;gap:6px;background:rgba(16,185,129,0.08);border:1px solid rgba(16,185,129,0.2);padding:5px 14px;border-radius:20px;font-size:12px;color:var(--green);font-weight:600;margin-bottom:20px}
.hero-badge .dot{width:7px;height:7px;background:var(--green);border-radius:50%;animation:pulse 2s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:0.4}}
.hero h1{font-size:clamp(28px,5vw,50px);font-weight:800;line-height:1.12;letter-spacing:-1px}
.hero h1 em{font-style:normal;background:linear-gradient(135deg,#2f54eb,#5c7cfa);-webkit-background-clip:text;-webkit-text-fill-color:transparent}
.hero p{color:var(--text2);font-size:16px;max-width:560px;margin:16px auto 28px}
.hero-actions{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:6px;padding:11px 24px;border-radius:24px;font-size:14px;font-weight:600;cursor:pointer;text-decoration:none;transition:all 0.2s;border:none}
.btn-primary{background:linear-gradient(135deg,#2f54eb,#1f3aa0);color:#fff;box-shadow:0 4px 14px var(--accent-glow)}
.btn-primary:hover{transform:translateY(-1px)}
.btn-outline{background:var(--surface);border:2px solid var(--border);color:var(--text)}
.btn-outline:hover{border-color:var(--accent)}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.grid4{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow-sm);transition:all 0.2s}
.card:hover{border-color:#d1d5db;box-shadow:var(--shadow)}
.model-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:12px}
.mc{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:18px;box-shadow:var(--shadow-sm);transition:all 0.2s}
.mc:hover{border-color:var(--accent);box-shadow:var(--shadow)}
.mc-top{display:flex;align-items:center;gap:8px;margin-bottom:10px}
.mc-av{width:30px;height:30px;border-radius:7px;display:flex;align-items:center;justify-content:center;font-size:12px;color:#fff;font-weight:700;flex-shrink:0}
.mc-n{font-weight:600;font-size:13px;line-height:1.2}
.mc-p{font-size:10px;color:var(--text3)}
.mc-d{font-size:11px;color:var(--text2);margin-bottom:8px;line-height:1.5;min-height:32px}
.mc-tags{display:flex;gap:4px;flex-wrap:wrap}
.tag{font-size:10px;font-weight:600;padding:2px 7px;border-radius:4px;background:var(--bg);color:var(--text2)}
.tag.grn{background:rgba(16,185,129,0.1);color:var(--green)}
.tag.blu{background:rgba(37,99,235,0.08);color:var(--blue)}
.tag.gld{background:rgba(47,84,235,0.08);color:var(--accent)}
.tabs{display:flex;gap:6px;justify-content:center;margin-bottom:30px;flex-wrap:wrap}
.tab-btn{padding:8px 18px;border-radius:20px;border:1.5px solid var(--border);background:var(--surface);color:var(--text2);font-size:12px;font-weight:500;cursor:pointer;transition:all 0.15s}
.tab-btn.active{background:var(--accent);color:#fff;border-color:var(--accent)}
.tab-panel{display:none}
.tab-panel.active{display:block}
.pricing-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;align-items:start}
.pc{background:var(--surface);border:2px solid var(--border);border-radius:var(--radius);padding:24px 18px;text-align:center;box-shadow:var(--shadow-sm);position:relative}
.pc.pop{border-color:var(--accent);box-shadow:0 8px 32px var(--accent-glow)}
.pc.pop::before{content:'BEST VALUE';position:absolute;top:-10px;left:50%;transform:translateX(-50%);background:var(--accent);color:#fff;font-size:9px;font-weight:700;padding:3px 12px;border-radius:10px;letter-spacing:1px}
.pc.glb{border-color:var(--blue);box-shadow:0 8px 32px rgba(37,99,235,0.15)}
.pc.glb::before{content:'GLOBAL';position:absolute;top:-10px;left:50%;transform:translateX(-50%);background:var(--blue);color:#fff;font-size:9px;font-weight:700;padding:3px 12px;border-radius:10px}
.pc-name{font-weight:700;font-size:15px}
.pc-amt{font-size:34px;font-weight:800;margin:10px 0 4px;letter-spacing:-1px}
.pc-amt small{font-size:13px;font-weight:400;color:var(--text3)}
.pc-tok{font-size:11px;color:var(--text2);margin-bottom:14px}
.pc-feat{list-style:none;text-align:left;font-size:12px}
.pc-feat li{padding:6px 0;border-bottom:1px solid var(--border-light);display:flex;align-items:center;gap:7px;color:var(--text2)}
.pc-feat li::before{content:'✓';color:var(--green);font-weight:700}
.pc .btn{margin-top:16px;width:100%;justify-content:center}
.router-cmp{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:24px}
.router-good{background:var(--surface);border:2px solid var(--green);border-radius:var(--radius);padding:20px}
.router-bad{background:var(--surface);border:2px solid rgba(239,68,68,0.3);border-radius:var(--radius);padding:20px;opacity:0.7}
.rl{display:flex;justify-content:space-between;padding:8px 0;font-size:13px;border-bottom:1px solid var(--border-light)}
.rl:last-child{border-bottom:none}
.dt{width:100%;border-collapse:collapse;font-size:13px;background:var(--surface);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-sm)}
.dt th{background:#f9fafb;padding:10px 14px;text-align:left;font-size:10px;text-transform:uppercase;letter-spacing:1px;color:var(--text2);font-weight:600;border-bottom:2px solid var(--border)}
.dt td{padding:10px 14px;border-bottom:1px solid var(--border-light)}
.dt tr:hover td{background:#fafafa}
.code-block{background:#1e293b;color:#e2e8f0;border-radius:var(--radius);padding:22px;font-family:monospace;font-size:12px;line-height:1.8;overflow-x:auto;position:relative}
.code-block .c1{color:#86efac}
.code-block .c2{color:#fbbf24}
.code-block .c3{color:#60a5fa}
.code-block .c4{color:#c4b5fd}
.code-block .c5{color:#94a3b8}
.copy-btn{position:absolute;top:10px;right:10px;background:rgba(255,255,255,0.1);border:1px solid rgba(255,255,255,0.2);color:#fff;padding:4px 10px;border-radius:4px;font-size:10px;cursor:pointer}
.privacy-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:14px}
.privacy-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow-sm)}
.privacy-card h4{font-size:14px;margin-bottom:8px}
.privacy-card li{font-size:12px;color:var(--text2);padding:3px 0;list-style:none}
.privacy-card li::before{content:'·';margin-right:6px;color:var(--accent);font-weight:700}
.modal-overlay{display:none;position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,0.5);z-index:200;align-items:center;justify-content:center;padding:20px}
.modal-overlay.open{display:flex}
.modal{background:var(--surface);border-radius:var(--radius);padding:30px 24px;max-width:440px;width:100%;box-shadow:var(--shadow-lg);max-height:90vh;overflow-y:auto;position:relative}
.modal h3{font-size:20px;margin-bottom:4px}
.modal>p{color:var(--text2);font-size:13px;margin-bottom:20px}
.fg{margin-bottom:14px}
.fg label{display:block;font-size:12px;font-weight:600;margin-bottom:4px}
.fg input,.fg select{width:100%;padding:10px 12px;border:1.5px solid var(--border);border-radius:8px;font-size:13px;font-family:inherit;background:var(--bg);transition:border 0.15s}
.fg input:focus,.fg select:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-light)}
.fg select{appearance:none;-webkit-appearance:none;background:var(--bg) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12'%3E%3Cpath d='M6 8L1 3h10z' fill='%236b7280'/%3E%3C/svg%3E") no-repeat right 10px center;padding-right:30px}
.fc{display:flex;align-items:flex-start;gap:8px;font-size:12px;color:var(--text2);margin-bottom:8px}
.fc input{margin-top:2px;accent-color:var(--accent);width:15px;height:15px;flex-shrink:0}
.fc a{color:var(--accent);font-weight:600}
.modal-close{position:absolute;top:12px;right:12px;background:none;border:none;font-size:22px;cursor:pointer;color:var(--text2)}
.chat-widget{position:fixed;bottom:20px;right:20px;z-index:150}
.chat-btn-w{width:52px;height:52px;border-radius:50%;background:linear-gradient(135deg,#2f54eb,#1f3aa0);color:#fff;border:none;cursor:pointer;font-size:22px;box-shadow:0 4px 20px var(--accent-glow);display:flex;align-items:center;justify-content:center}
.chat-panel-w{display:none;position:absolute;bottom:64px;right:0;width:340px;max-height:480px;background:#fff;border-radius:var(--radius);box-shadow:var(--shadow-lg);overflow:hidden;border:1px solid var(--border)}
.chat-panel-w.open-w{display:flex;flex-direction:column}
.chat-header-w{background:linear-gradient(135deg,#2f54eb,#1f3aa0);color:#fff;padding:12px 16px;font-weight:700;font-size:13px}
.chat-msgs-w{flex:1;overflow-y:auto;padding:12px;min-height:200px;max-height:300px;display:flex;flex-direction:column;gap:8px}
.msg-bot{background:#f3f4f6;padding:8px 12px;border-radius:10px 10px 10px 2px;font-size:12px;align-self:flex-start;max-width:85%}
.msg-user{background:var(--accent);color:#fff;padding:8px 12px;border-radius:10px 10px 2px 10px;font-size:12px;align-self:flex-end;max-width:85%}
.chat-input-w{display:flex;gap:6px;padding:10px;border-top:1px solid var(--border)}
.chat-input-w input{flex:1;padding:8px 12px;border:1px solid var(--border);border-radius:16px;font-size:12px;outline:none;font-family:inherit}
.chat-input-w button{width:32px;height:32px;border-radius:50%;background:var(--accent);color:#fff;border:none;cursor:pointer;font-size:14px;flex-shrink:0}
.chat-powered{text-align:center;font-size:9px;color:var(--text3);padding:6px;background:#f9fafb}
.footer{border-top:1px solid var(--border);padding:40px 20px;text-align:center;font-size:12px;color:var(--text3)}
.footer-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;max-width:800px;margin:0 auto 20px;text-align:left}
.footer-grid h5{font-size:10px;text-transform:uppercase;letter-spacing:1.5px;color:var(--text2);margin-bottom:12px}
.footer-grid a{display:block;color:var(--text3);text-decoration:none;font-size:12px;padding:2px 0}
.footer-grid a:hover{color:var(--accent)}
@media(min-width:769px){.mobile-menu{display:none!important}}
@keyframes pulse{0%,100%{opacity:1;box-shadow:0 0 0 0 rgba(16,185,129,0.4)}50%{opacity:0.5;box-shadow:0 0 0 10px rgba(16,185,129,0)}}
@keyframes slideIn{from{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}
@keyframes countUp{from{opacity:0;transform:scale(0.5)}to{opacity:1;transform:scale(1)}}
@keyframes borderGlow{0%,100%{border-color:rgba(47,84,235,0.3)}50%{border-color:rgba(47,84,235,0.8)}}
@keyframes arrow{0%,100%{opacity:0.4;transform:translateX(0)}50%{opacity:1;transform:translateX(6px)}}
.hero .btn{animation:slideIn 0.6s ease both}
.hero .btn:nth-child(2){animation-delay:0.15s}
.hero .btn:nth-child(3){animation-delay:0.3s}
.hero-badge .dot{animation:pulse 2s infinite}
.flow-demo{display:flex;align-items:center;justify-content:center;gap:12px;flex-wrap:wrap;margin:32px auto;max-width:700px;padding:20px;background:var(--surface);border-radius:var(--radius);border:2px dashed var(--border);box-shadow:var(--shadow)}
.flow-node{padding:10px 18px;background:var(--bg);border:2px solid var(--border);border-radius:var(--radius);font-weight:600;font-size:13px;animation:borderGlow 3s infinite}
.flow-node.gold{border-color:var(--accent)}
.trust-strip{display:flex;gap:20px;justify-content:center;flex-wrap:wrap;padding:30px 0;margin:30px 0;border-top:1px solid var(--border);border-bottom:1px solid var(--border)}
.trust-badge{display:flex;align-items:center;gap:6px;font-size:12px;font-weight:600;color:var(--text2)}
.trust-badge .icon{font-size:20px}
.stat-card .stat-val{animation:countUp 0.6s ease both}
/* Dark mode */
body.dark{--bg:#0f172a;--surface:#1e293b;--border:#334155;--border-light:#1e293b;--text:#f1f5f9;--text2:#94a3b8;--text3:#64748b;--accent:#5c7cfa;--accent-light:rgba(92,124,250,0.1);--gold:var(--accent);--gold-light:var(--accent-light);--shadow-sm:0 1px 3px rgba(0,0,0,0.3);--shadow:0 4px 16px rgba(0,0,0,0.3);--shadow-lg:0 12px 40px rgba(0,0,0,0.4)}
body.dark .nav{background:rgba(15,23,42,0.95);border-bottom-color:#1e293b}
body.dark .nav-links a:hover{background:#1e293b}
body.dark .pc{background:#1e293b;border-color:#334155}
body.dark .card{background:#1e293b;border-color:#334155}
body.dark table th{background:#0f172a}
body.dark .code-block{background:#000}
body.dark .tab-btn{background:#1e293b}
body.dark button.btn-outline{background:#1e293b;color:#94a3b8}
body.dark .mc{background:#1e293b;border-color:#334155}
body.dark .mc:hover{border-color:#5c7cfa}
body.dark .chat-panel-w{background:#1e293b;border-color:#334155}
body.dark .chat-msgs-w{background:#0f172a}
body.dark .msg-bot{background:#1e293b;color:#e2e8f0}
body.dark .chat-input-w{background:#1e293b;border-color:#334155}
body.dark .chat-input-w input{background:#0f172a;border-color:#334155;color:#f1f5f9}
body.dark .modal{background:#1e293b}
body.dark .modal p{color:#94a3b8}
body.dark .fg input,body.dark .fg select{background:#0f172a;border-color:#334155;color:#f1f5f9}
body.dark .privacy-card{background:#1e293b}
body.dark .privacy-card li{color:#94a3b8}
body.dark .chat-powered{background:#0f172a}
body.dark .router-good{background:#1e293b}
body.dark .router-bad{background:#1e293b}
body.dark .dt{background:#1e293b}
body.dark .dt th{background:#0f172a}
body.dark .footer{background:#1e293b}
body.dark tr:nth-child(even) td{background:rgba(255,255,255,0.02)}
body.dark .login-drop{background:#1e293b;border-color:#334155}
body.dark .login-drop a{color:#94a3b8}
body.dark .st-card{background:#1e293b}
body.dark .st-bar{background:#1e293b}
body.dark footer{background:#1e293b}
body.dark .hero-badge{background:rgba(16,185,129,0.1)}
body.dark .modal-overlay{background:rgba(0,0,0,0.7)}
body.dark .model-select{background:#1e293b;border-color:#334155;color:#f1f5f9}
body.dark .chat-input-area textarea{background:#1e293b;border-color:#334155;color:#f1f5f9}
body.dark .msg.assistant .msg-content{background:#1e293b}
/* Theme toggle */
.theme-toggle{background:none;border:1.5px solid var(--border);border-radius:20px;cursor:pointer;font-size:16px;padding:6px 10px;line-height:1;transition:all 0.2s}
.theme-toggle:hover{border-color:var(--accent)}
/* Login picker (shared) */
.login-picker{position:relative}
.login-drop{display:none;position:absolute;top:100%;right:0;margin-top:4px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);min-width:140px;z-index:50;box-shadow:0 12px 40px rgba(0,0,0,0.1)}
.login-picker.active .login-drop{display:block}
.login-drop a{display:block;padding:10px 16px;color:var(--text);text-decoration:none;font-size:13px;font-weight:500}
.login-drop a:hover{background:var(--accent-light);color:var(--accent)}
.cnt-only{display:none}
/* Chat page styles */
.login-wall{display:flex;align-items:center;justify-content:center;min-height:60vh;text-align:center}
.login-wall-inner{max-width:400px;padding:40px}
.login-wall-inner h3{font-size:24px;margin-bottom:8px}
.login-wall-inner p{color:var(--text2);font-size:14px;margin-bottom:20px}
.chat-container{flex:1;display:flex;flex-direction:column;max-width:900px;margin:0 auto;width:100%;padding:0 16px;min-height:0}
.chat-header{display:flex;align-items:center;justify-content:space-between;padding:12px 0;border-bottom:1px solid var(--border);flex-shrink:0;gap:12px;flex-wrap:wrap}
.chat-messages{flex:1;overflow-y:auto;padding:16px 0;display:flex;flex-direction:column;gap:12px}
.msg{display:flex;gap:10px;max-width:85%}
.msg.user{align-self:flex-end;flex-direction:row-reverse}
.msg.assistant{align-self:flex-start}
.msg-avatar{width:32px;height:32px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:14px;flex-shrink:0}
.msg.user .msg-avatar{background:var(--bg);border:1px solid var(--border)}
.msg.assistant .msg-avatar{background:linear-gradient(135deg,#2f54eb,#5c7cfa);color:#fff}
.msg-content{padding:10px 14px;border-radius:16px;font-size:13px;line-height:1.6;word-break:break-word}
.msg.user .msg-content{background:var(--accent);color:#fff;border-bottom-right-radius:4px}
.msg.assistant .msg-content{background:var(--surface);border:1px solid var(--border);border-bottom-left-radius:4px;white-space:pre-wrap}
.chat-input-area{flex-shrink:0;padding:12px 0 20px;display:flex;gap:10px;align-items:flex-end}
.chat-input-area textarea{flex:1;padding:12px 16px;border:1.5px solid var(--border);border-radius:20px;font-size:13px;resize:none;min-height:44px;max-height:120px;font-family:inherit;background:var(--surface);color:var(--text);line-height:1.4}
.chat-input-area textarea:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-light)}
.chat-input-area button{width:44px;height:44px;border-radius:50%;background:linear-gradient(135deg,#2f54eb,#1f3aa0);color:#fff;border:none;cursor:pointer;font-size:18px;flex-shrink:0;display:flex;align-items:center;justify-content:center}


/* ============================================================
   W3-C 第 5 步 · 4 类组件质感升级（按钮 / 输入框 / 卡片 / 弹层）
   基线: _shared/ui.css 22567 B sha16 1d302a48fde86633（已含第 6 步 D3）
   ⛔ 只覆盖这 4 类组件。布局 / 配色 / z-index / focus 环 一字未动。
   ============================================================ */

:root{
  --ease-out:cubic-bezier(.16,1,.3,1);
  --dur-1:120ms;
  --dur-2:220ms;
  --lift-1:-1px;
  --lift-2:-2px;
  --ring-1:rgba(16,24,40,.06);
  --ring-2:rgba(16,24,40,.10);
  --shade:rgba(11,12,15,.18);
  --shade-soft:rgba(11,12,15,.10);
}
body.dark{
  --ring-1:rgba(0,0,0,.28);
  --ring-2:rgba(0,0,0,.4);
  --shade:rgba(0,0,0,.55);
  --shade-soft:rgba(0,0,0,.4);
}

/* A · 按钮 —— 尺寸梯度 + 近/远两档阴影 + active 层 */
/* ⚠️ 中号尺寸必须留在 .btn 本体上：线上大量 <a class="btn btn-primary">
   不带任何尺寸类，若把 padding 只挂在 .btn-md 上，它们会全部塌成 0。 */
.btn{
  display:inline-flex;align-items:center;gap:7px;padding:11px 24px;
  border-radius:24px;font-size:14px;
  font-weight:600;cursor:pointer;text-decoration:none;border:none;
  letter-spacing:-0.006em;
  transition:transform var(--dur-1) var(--ease-out),
             box-shadow var(--dur-2) var(--ease-out),
             background-color var(--dur-2) var(--ease-out),
             border-color var(--dur-2) var(--ease-out);
}
.btn-sm{padding:8px 16px;font-size:13px}
.btn-lg{padding:14px 32px;font-size:15px}
.btn-primary{
  background:linear-gradient(135deg,#2f54eb,#1f3aa0);color:#fff;
  box-shadow:0 1px 2px var(--ring-1), 0 4px 14px var(--accent-glow);
}
.btn-primary:hover{
  transform:translateY(var(--lift-1));
  box-shadow:0 2px 4px var(--ring-1), 0 10px 24px rgba(47,84,235,.28);
}
.btn-primary:active{
  transform:translateY(0);
  box-shadow:0 1px 2px var(--ring-2), 0 3px 8px var(--accent-glow);
}
.btn-outline{
  background:var(--surface);border:1.5px solid var(--border);color:var(--text);
  box-shadow:0 1px 2px var(--ring-1);
}
.btn-outline:hover{
  border-color:var(--accent);color:var(--accent);
  background:var(--accent-light);
  transform:translateY(var(--lift-1));
}
.btn-outline:active{transform:translateY(0);box-shadow:none}

/* B · 输入框 —— 内边距节奏 + 圆角 + 占位符对比 + 错误态（focus 环一字未改） */
.fg{margin-bottom:15px}
.fg label{display:block;font-size:12px;font-weight:600;margin-bottom:5px;letter-spacing:.005em}
.fg input,.fg select{
  width:100%;padding:11px 13px;border:1.5px solid var(--border);border-radius:10px;
  font-size:13px;font-family:inherit;background:var(--bg);color:var(--text);
  transition:border-color var(--dur-2) var(--ease-out),
             box-shadow var(--dur-2) var(--ease-out),
             background-color var(--dur-2) var(--ease-out);
}
.fg input::placeholder{color:var(--text2);opacity:.85}
.fg input:hover,.fg select:hover{border-color:#d1d5db}
.fg input:focus,.fg select:focus{
  outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-light);
}
.fg.err input,.fg.err select{border-color:var(--red);box-shadow:0 0 0 3px rgba(239,68,68,.12)}
.fg .err-msg{display:block;margin-top:5px;font-size:11.5px;color:var(--red)}

/* C · 卡片 —— 两档阴影 + 负向位移 2px（布局未动） */
.card{
  background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);
  padding:22px;transition:transform var(--dur-2) var(--ease-out),
                          box-shadow var(--dur-2) var(--ease-out),
                          border-color var(--dur-2) var(--ease-out);
  box-shadow:0 1px 2px var(--ring-1), 0 10px 28px -16px var(--ring-2);
}
.card:hover{
  border-color:var(--border);
  transform:translateY(var(--lift-2));
  box-shadow:0 2px 4px var(--ring-1), 0 18px 40px -18px var(--ring-2);
}
.card h3{margin:0 0 6px;font-size:15px}
.card p{margin:0;font-size:13px;color:var(--text2);line-height:1.6}

/* D · 弹层 —— 圆角 16 + 大扩散阴影 + 入场曲线（z-index 未动） */
.modal{
  background:var(--surface);border-radius:16px;padding:30px 26px;
  max-width:440px;width:100%;position:relative;
  box-shadow:0 24px 56px -12px var(--shade), 0 8px 20px -8px var(--shade-soft);
  animation:modalIn var(--dur-2) var(--ease-out) both;
}
.modal h3{font-size:20px;margin:0 0 4px}
.modal>p{color:var(--text2);font-size:13px;margin:0 0 20px}
@keyframes modalIn{
  from{opacity:0;transform:translateY(8px) scale(.985)}
  to{opacity:1;transform:none}
}
@media(max-width:768px){.nav-links{display:none}.nav-links.open-mobile{display:flex;flex-direction:column;position:absolute;top:56px;left:0;right:0;background:var(--bg);border-bottom:1px solid var(--border);padding:8px 16px;z-index:99;gap:2px}.hamburger{display:flex}.grid2,.grid3,.grid4,.router-cmp,.pricing-grid,.footer-grid{grid-template-columns:1fr}.hero h1{font-size:26px}.sec{padding:50px 16px}.modal{max-width:100%}.chat-widget{display:none}.chat-btn-w{width:44px;height:44px;font-size:18px}}
/* W3-C step1 keyboard focus ring (additive; legacy focus rules untouched) */
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.btn:focus-visible,.nav-links a:focus-visible,.mobile-menu a:focus-visible,.tab-btn:focus-visible,.pr-tab:focus-visible,.card a:focus-visible{outline:2px solid var(--accent);outline-offset:3px}

@media (prefers-reduced-motion: reduce){
*,*::before,*::after{animation-duration:0.01ms!important;animation-iteration-count:1!important;transition-duration:0.01ms!important;scroll-behavior:auto!important}
}