:root{color:#0f172a;--text:#0f172a;--muted:#475569;--muted-soft:#64748b;--border:#0f172a1a;--border-strong:#0f172a29;--card:#ffffffdb;--card-strong:#fffffff5;--surface:#f1f5f9e0;--surface-strong:#e2e8f0eb;--primary:#1d4ed8;--primary-deep:#1e3a8a;--primary-soft:#e7eefc;--accent:#0f766e;--danger-soft:#fee2e2;--danger-text:#b42318;--shadow:0 24px 72px #0f172a1a;background:radial-gradient(circle at 0 0,#1d4ed81f,#0000 30%),radial-gradient(circle at 100%,#0f172a14,#0000 28%),linear-gradient(#f8fafc 0%,#eef2f7 100%);font-family:Segoe UI,PingFang SC,Microsoft YaHei,sans-serif}*{box-sizing:border-box}body{min-height:100vh;margin:0}button,input,select,textarea{font:inherit}button{cursor:pointer}.loading-screen,.login-shell{place-items:center;min-height:100vh;padding:24px;display:grid}.login-card,.country-card,.modal-card,.hero,.message-banner{-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);background:var(--card);border:1px solid var(--border);box-shadow:var(--shadow)}.login-card{border-radius:28px;width:min(460px,100%);padding:32px}.login-card h1,.hero h1{letter-spacing:-.04em;margin:8px 0 12px;font-size:clamp(2rem,5vw,3.4rem);line-height:1}.eyebrow{color:var(--primary);text-transform:uppercase;letter-spacing:.16em;font-size:.86rem;font-weight:700}.login-form,.node-form{gap:14px;margin-top:24px;display:grid}.login-form label,.node-form label{gap:8px;display:grid}input,select,textarea{color:var(--text);background:#fffffff0;border:1px solid #94a3b859;border-radius:14px;padding:12px 14px}input:focus,select:focus,textarea:focus{border-color:#1d4ed873;outline:none;box-shadow:0 0 0 4px #1d4ed81a}textarea{resize:vertical;min-height:180px}.primary-button,.secondary-button,.danger-button,.text-button{border:0;border-radius:999px;padding:11px 18px;transition:transform .15s,opacity 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14px}.group-grid{gap:18px;margin-top:20px;display:grid}.country-card{border-radius:28px;padding:20px}.country-card.open{background:var(--card-strong)}.country-toggle{text-align:left;background:0 0;border:0;justify-content:space-between;align-items:center;gap:16px;width:100%;margin-bottom:16px;padding:0;display:flex}.country-heading-wrap{gap:6px;display:grid}.country-count{color:var(--muted-soft);font-size:.95rem}.country-header h2{margin:0;font-size:1.5rem}.country-heading{align-items:center;gap:10px;display:inline-flex}.country-flag{font-size:1.35rem;line-height:1}.country-toggle-icon{background:var(--primary-soft);width:36px;height:36px;color:var(--primary);border-radius:999px;flex:none;justify-content:center;align-items:center;font-size:1.35rem;line-height:1;display:inline-flex}.node-list{gap:14px;display:grid}.node-card{background:linear-gradient(135deg,#fffffff7,#f8fafcf5);border:1px solid #94a3b83d;border-radius:22px;padding:14px 18px 18px}.node-card.open{background:linear-gradient(135deg,#fffffffc,#f3f6fafa)}.node-toggle{text-align:left;background:0 0;border:0;justify-content:space-between;align-items:center;gap:16px;width:100%;padding:0;display:flex}.node-title{gap:6px;display:grid}.node-country-badge{background:var(--primary-soft);color:#1e293b;border-radius:999px;align-items:center;gap:8px;width:fit-content;padding:6px 10px;font-size:.86rem;font-weight:600;display:inline-flex}.node-country-flag{line-height:1}.node-title span{color:var(--muted-soft)}.node-toggle-icon{background:var(--surface);width:32px;height:32px;color:var(--primary-deep);border-radius:999px;flex:none;justify-content:center;align-items:center;font-size:1.25rem;line-height:1;display:inline-flex}.meta-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin:18px 0;display:grid}.meta-grid div{background:var(--surface);border-radius:16px;padding:12px}.meta-grid dt{color:var(--muted-soft);margin-bottom:6px}.meta-grid dd{word-break:break-all;margin:0}.node-actions{flex-wrap:wrap;gap:10px;display:flex}.modal-backdrop{background:#0f172a8a;place-items:center;padding:24px;display:grid;position:fixed;inset:0}.modal-card{border-radius:28px;width:min(760px,100%);padding:22px}.modal-header{justify-content:space-between;align-items:center;gap:16px;margin-bottom:18px;display:flex}.modal-header h2{margin:0}.mode-switch{background:var(--surface);border-radius:999px;gap:8px;margin-bottom:18px;padding:6px;display:inline-flex}.mode-chip{color:var(--muted);background:0 0;border:0;border-radius:999px;padding:9px 14px}.mode-chip.active{color:var(--primary-deep);background:#fff;box-shadow:0 8px 24px #0f172a14}.node-form{grid-template-columns:repeat(2,minmax(0,1fr))}.node-form .wide{grid-column:span 2}.modal-actions{grid-column:span 2;justify-content:flex-end;gap:10px;margin-top:10px;display:flex}.qr-card{text-align:center;width:min(420px,100%)}.qr-image{aspect-ratio:1;object-fit:contain;background:#fff;border-radius:24px;width:min(100%,320px);padding:16px}.qr-caption{color:var(--muted);margin-top:14px}@media (width<=900px){.hero{flex-direction:column}.meta-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media (width<=640px){.app-shell{padding:16px}.hero,.country-card,.modal-card,.login-card{border-radius:22px;padding:18px}.meta-grid,.node-form{grid-template-columns:1fr}.node-form .wide,.modal-actions{grid-column:span 1}.node-topline,.modal-header{flex-direction:column;align-items:flex-start}.country-toggle{align-items:flex-start}}