:root{
  --navy:#0f2742; --blue:#1f6fb2; --blue2:#3a93d6;
  --bg:#eef2f6; --card:#fff; --line:#d6dee7; --txt:#1d2b3a; --mut:#6b7a8d;
  --ok:#1f9d57; --warn:#e08a00; --red:#c0392b; --purple:#7b4dbf;
  --shadow:0 8px 28px rgba(15,39,66,.10);
}
*{box-sizing:border-box;font-family:"Segoe UI","Microsoft JhengHei","PingFang HK",sans-serif;}
body{margin:0;background:var(--bg);color:var(--txt);font-size:16px;line-height:1.55;}
.hidden{display:none!important;}
button{cursor:pointer;border:none;border-radius:8px;font-size:15px;}
.btn-primary{background:var(--blue);color:#fff;padding:11px 18px;font-weight:600;}
.btn-primary:hover{background:var(--blue2);}
.btn-ghost{background:#eef2f6;color:var(--navy);padding:9px 14px;border:1px solid var(--line);}
.btn-back{background:#fff;color:var(--navy);padding:8px 14px;border:1px solid var(--line);}

/* ---------- Login ---------- */
#login{height:100vh;display:flex;align-items:center;justify-content:center;
  background:linear-gradient(135deg,var(--navy),var(--blue));padding:20px;}
.login-card{background:#fff;padding:34px 40px;border-radius:16px;width:380px;max-width:100%;box-shadow:var(--shadow);}
.login-card h1{margin:0 0 4px;font-size:24px;color:var(--navy);}
.login-card .brand{font-weight:800;letter-spacing:.5px;}
.login-card .sub{color:var(--mut);font-size:14px;margin-bottom:18px;}
.login-card label{display:block;font-size:13px;color:var(--mut);margin:12px 0 4px;}
.login-card input,.login-card select{width:100%;padding:11px;border:1px solid var(--line);border-radius:8px;font-size:15px;}
.login-row{display:flex;gap:8px;}
.login-row select{width:140px;flex:0 0 140px;}
.err{color:var(--red);font-size:13px;margin-top:10px;min-height:16px;}
.login-foot{margin-top:16px;font-size:12px;color:var(--mut);text-align:center;}

/* ---------- App shell ---------- */
#app{min-height:100vh;}
.topbar{background:var(--navy);color:#fff;display:flex;align-items:center;
  padding:12px 22px;gap:14px;position:sticky;top:0;z-index:30;}
.topbar .logo{font-weight:800;font-size:19px;letter-spacing:.5px;}
.topbar .spacer{flex:1;}
.topbar .shop{font-size:14px;opacity:.92;}
.topbar .pill{background:rgba(255,255,255,.15);padding:5px 11px;border-radius:20px;font-size:13px;}
.icon-btn{background:rgba(255,255,255,.15);color:#fff;padding:7px 11px;border-radius:8px;position:relative;font-size:14px;}
.icon-btn .dot{position:absolute;top:-3px;right:-3px;width:10px;height:10px;border-radius:50%;background:var(--warn);border:2px solid var(--navy);}
.lang-sel{background:rgba(255,255,255,.15);color:#fff;border:none;padding:7px 10px;border-radius:8px;font-size:14px;}

.wrap{max-width:1100px;margin:0 auto;padding:24px 22px 90px;}
.section-title{font-size:20px;font-weight:700;color:var(--navy);margin:6px 0 4px;}
.section-sub{color:var(--mut);font-size:14px;margin-bottom:18px;}

/* search */
.quick-search{display:flex;gap:8px;margin-bottom:22px;}
.quick-search input{flex:1;padding:12px 14px;border:1px solid var(--line);border-radius:10px;font-size:15px;}
.quick-search .btn-primary{padding:12px 20px;}

/* product grid */
.prod-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:18px;}
.prod-card{background:var(--card);border-radius:14px;box-shadow:var(--shadow);overflow:hidden;
  border-top:5px solid var(--blue);display:flex;flex-direction:column;cursor:pointer;transition:transform .12s;}
.prod-card:hover{transform:translateY(-3px);}
.prod-card .body{padding:18px 18px 8px;}
.prod-card .rank{font-size:12px;font-weight:700;color:#fff;background:var(--mut);padding:3px 9px;border-radius:20px;display:inline-block;margin-bottom:8px;}
.prod-card h3{margin:0 0 2px;font-size:22px;}
.prod-card .tag{color:var(--mut);font-size:14px;margin-bottom:10px;}
.prod-card .intro{font-size:14px;color:#33445a;margin-bottom:12px;}
.prod-card .meta{font-size:13px;color:var(--mut);border-top:1px solid var(--line);padding-top:10px;}
.prod-card .meta b{color:var(--txt);}
.prod-card .foot{padding:12px 18px;border-top:1px solid var(--line);background:#f7fafc;font-size:14px;color:var(--blue);font-weight:600;}

/* workflow stepper */
.stepper{display:flex;flex-wrap:wrap;gap:8px;margin:14px 0 20px;}
.step{background:#eaf2fb;color:var(--navy);padding:8px 13px;border-radius:20px;font-size:14px;font-weight:600;}
.step .n{display:inline-block;width:20px;height:20px;line-height:20px;text-align:center;background:var(--blue);color:#fff;border-radius:50%;font-size:12px;margin-right:6px;}

/* detail panels */
.panel{background:var(--card);border-radius:14px;box-shadow:var(--shadow);padding:20px;margin-bottom:18px;}
.panel h4{margin:0 0 12px;font-size:17px;color:var(--navy);}
.spec-table{width:100%;border-collapse:collapse;font-size:14px;}
.spec-table td{padding:8px 10px;border-bottom:1px solid var(--line);vertical-align:top;}
.spec-table td:first-child{color:var(--mut);width:38%;font-weight:600;}

.group-block{margin-bottom:18px;}
.group-block h5{margin:0 0 10px;font-size:15px;color:var(--blue);}
.series-tags{display:flex;flex-wrap:wrap;gap:10px;}
.series-chip{background:#f2f6fb;border:1px solid var(--line);border-radius:10px;padding:10px 12px;font-size:14px;min-width:120px;}
.series-chip .sname{font-weight:700;color:var(--navy);}
.series-chip .scount{color:var(--mut);font-size:12px;}
.series-chip.pending{opacity:.65;border-style:dashed;}
.series-chip .snote{color:var(--warn);font-size:12px;margin-top:4px;display:block;}

.price-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px;}
@media(max-width:680px){.price-grid{grid-template-columns:1fr;}}
.price-card h5{margin:0 0 8px;font-size:15px;color:var(--navy);}
.price-card table{width:100%;border-collapse:collapse;font-size:14px;}
.price-card td{padding:7px 8px;border-bottom:1px solid var(--line);}
.price-card td:last-child{text-align:right;font-weight:700;color:var(--blue);}

.evidence table{width:100%;border-collapse:collapse;font-size:13.5px;}
.evidence th,.evidence td{padding:9px 10px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top;}
.evidence th{background:#f2f6fb;color:var(--navy);}

.back-row{margin-bottom:14px;}

/* AI assistant */
#ai-fab{position:fixed;right:22px;bottom:22px;width:58px;height:58px;border-radius:50%;
  background:var(--purple);color:#fff;font-size:24px;box-shadow:0 8px 22px rgba(123,77,191,.45);z-index:50;}
#ai-fab:hover{background:#693fab;}
#ai-panel{position:fixed;right:22px;bottom:92px;width:360px;max-width:calc(100vw - 30px);height:480px;max-height:calc(100vh - 120px);
  background:#fff;border-radius:16px;box-shadow:0 16px 50px rgba(15,39,66,.28);z-index:50;display:flex;flex-direction:column;overflow:hidden;}
#ai-panel .ai-head{background:var(--purple);color:#fff;padding:13px 16px;font-weight:700;display:flex;align-items:center;gap:8px;}
#ai-panel .ai-head .x{margin-left:auto;cursor:pointer;font-size:18px;opacity:.9;}
#ai-msgs{flex:1;overflow-y:auto;padding:14px;display:flex;flex-direction:column;gap:10px;background:#faf7fd;}
.msg{max-width:85%;padding:9px 12px;border-radius:12px;font-size:14px;line-height:1.5;}
.msg.user{background:var(--blue);color:#fff;align-self:flex-end;border-bottom-right-radius:3px;}
.msg.bot{background:#fff;border:1px solid var(--line);align-self:flex-start;border-bottom-left-radius:3px;}
.msg.bot .src{display:block;margin-top:6px;font-size:11px;color:var(--mut);}
#ai-input{display:flex;border-top:1px solid var(--line);}
#ai-input input{flex:1;border:none;padding:12px 14px;font-size:14px;outline:none;}
#ai-input button{background:var(--purple);color:#fff;padding:0 18px;font-weight:600;}
.ai-suggest{display:flex;flex-wrap:wrap;gap:6px;padding:8px 14px;border-top:1px solid var(--line);background:#faf7fd;}
.ai-suggest span{background:#efe7fa;color:var(--purple);font-size:12px;padding:5px 9px;border-radius:14px;cursor:pointer;}

/* staging banner */
.staging-banner{background:#fff4e0;color:#8a5a00;border-bottom:1px solid #f0d9a8;
  padding:8px 22px;font-size:13px;text-align:center;font-weight:600;}

/* WhatsApp share button */
.btn-wa{background:var(--ok);color:#fff;padding:11px 18px;font-weight:600;}
.btn-wa:hover{background:#178a4a;}

/* modal */
.modal{position:fixed;inset:0;background:rgba(15,39,66,.45);display:flex;align-items:center;justify-content:center;z-index:80;padding:18px;}
.modal-box{background:#fff;border-radius:16px;box-shadow:var(--shadow);width:520px;max-width:100%;padding:22px;max-height:90vh;overflow:auto;}
.modal-head{font-size:18px;font-weight:700;color:var(--navy);display:flex;align-items:center;margin-bottom:6px;}
.modal-head .x{margin-left:auto;cursor:pointer;font-size:22px;opacity:.6;line-height:1;}
.modal-sub{color:var(--mut);font-size:13.5px;margin-bottom:14px;}
#share-text{width:100%;border:1px solid var(--line);border-radius:10px;padding:12px;font-size:14px;line-height:1.6;resize:vertical;font-family:"Microsoft JhengHei",monospace;}
.share-row{display:flex;gap:8px;margin:12px 0;flex-wrap:wrap;}
.share-qr{background:#f7fafc;border:1px solid var(--line);border-radius:10px;padding:14px;text-align:center;font-size:13px;color:var(--navy);}
.share-qr img{margin-top:8px;width:180px;height:180px;border:1px solid var(--line);border-radius:8px;background:#fff;}
.share-note{margin-top:12px;font-size:12px;color:var(--warn);background:#fff7e8;border:1px solid #f0d9a8;border-radius:8px;padding:8px 10px;}

/* toast */
.toast{position:fixed;left:50%;bottom:32px;transform:translateX(-50%) translateY(20px);
  background:var(--navy);color:#fff;padding:11px 20px;border-radius:24px;font-size:14px;font-weight:600;
  box-shadow:var(--shadow);opacity:0;pointer-events:none;transition:all .25s;z-index:90;}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0);}