:root{--brand:#2f6fed;--brand-dark:#1f4fbc;--brand-soft:#2f6fed1a;--success:#16a34a;--success-soft:#16a34a1f;--danger:#dc2626;--danger-soft:#dc26261a;--warning:#b45309;--warning-soft:#b453091f;--text:#101828;--text-muted:#667085;--text-faint:#98a2b3;--border:#e4e7ec;--surface:#fff;--surface-soft:#f8fafc;--sidebar:#0f172a;--sidebar-text:#cbd5e1;--radius-sm:8px;--radius:14px;--radius-lg:20px;--shadow-sm:0 1px 2px #1018280f;--shadow:0 12px 32px #10182814;--shadow-lg:0 24px 60px #1018281f;--seat-cell:56px}*{box-sizing:border-box}html,body,#app{height:100%}body{color:var(--text);background:var(--surface-soft);-webkit-font-smoothing:antialiased;margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif}a{color:var(--brand);text-decoration:none}a:hover{text-decoration:underline}.auth-page{background:var(--surface-soft);grid-template-columns:minmax(0,1.05fr) 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0}.seat-cell.is-seat{white-space:normal;word-break:break-all;border-style:solid;border-color:var(--border);background:var(--surface);color:var(--text);font-weight:500;line-height:1.2}.seat-cell.is-seat.is-assigned{border-color:var(--brand);background:var(--brand-soft);color:var(--brand-dark)}.seat-cell.is-podium{border-style:solid;border-color:var(--brand);background:var(--brand);color:#fff;letter-spacing:2px;font-weight:600}.seat-cell.is-door{border-style:solid;border-color:var(--warning);background:var(--warning-soft);color:var(--warning)}.seat-cell.is-aisle{background:repeating-linear-gradient(45deg, var(--surface-soft), var(--surface-soft) 6px, var(--surface) 6px, var(--surface) 12px);border-style:dashed}.seat-toolbar{flex-wrap:wrap;align-items:center;gap:8px;margin-bottom:12px;display:flex}.seat-tool{border:1px solid var(--border);background:var(--surface);color:var(--text-muted);cursor:pointer;border-radius:999px;padding:6px 12px;font-size:12px}.seat-tool.active{border-color:var(--brand);background:var(--brand-soft);color:var(--brand-dark)}.seat-hint{color:var(--text-faint);font-size:12px;line-height:1.7}.modal-wide{width:min(1080px,100vw - 48px)}.plan-grid{grid-template-columns:minmax(0,1fr) 220px;align-items:start;gap:16px;display:grid}.plan-side{border-left:1px solid var(--border);padding-left:14px}.student-chip{border:1px solid var(--border);background:var(--surface);cursor:pointer;text-align:left;border-radius:999px;padding:6px 10px;font-size:12px}.student-chip:hover:not(:disabled){border-color:var(--brand);color:var(--brand)}.student-chip:disabled{opacity:.5;cursor:not-allowed}@media (width<=860px){.plan-grid{grid-template-columns:1fr}.plan-side{border-left:none;border-top:1px solid var(--border);padding-top:12px;padding-left:0}}.point-positive{color:var(--success)}.point-negative{color:var(--danger)}.check-col{text-align:center;width:44px}.check-col input{width:16px;height:16px;accent-color:var(--brand)}.radio-row{flex-wrap:wrap;gap:10px;display:flex}.radio-row .check-item{flex:200px}.seat-cell.is-selected{outline:2px solid var(--brand);outline-offset:1px;box-shadow:0 0 0 3px var(--brand-soft)}.seat-cell.is-empty.interactive{border-color:var(--border);background:linear-gradient(0deg, #94a3b81f 1px, transparent 1px) 0 0 / 100% 8px, var(--surface)}.seat-cell.is-empty.interactive:hover{background:var(--brand-soft)}.btn.is-confirm{border-color:var(--danger);color:var(--danger);background:var(--danger-soft)}.plan-form{grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:0 14px;display:grid}.size-input{text-align:center;width:64px}.user-auth{background:#f4f7fb;grid-template-columns:minmax(0,1.05fr) minmax(0,1fr);min-height:100vh;display:grid}.user-auth-aside{color:#e2e8f0;background:radial-gradient(120% 120% at 0 0,#1e3a8a 0%,#0f172a 55%,#020617 100%);flex-direction:column;justify-content:space-between;gap:40px;padding:48px 56px;display:flex;position:relative;overflow:hidden}.user-auth-aside:before{content:"";filter:blur(8px);background:radial-gradient(circle,#2f6fed8c,#0000 65%);border-radius:50%;width:420px;height:420px;position:absolute;top:-160px;right:-120px}.user-auth-aside:after{content:"";border:1px solid #ffffff1f;border-radius:50%;width:320px;height:320px;position:absolute;bottom:-140px;left:-80px}.user-auth-brand{z-index:1;color:#fff;letter-spacing:.2px;align-items:center;gap:10px;font-weight:600;display:inline-flex;position:relative}.user-auth-brand:hover{text-decoration:none}.user-auth-brand-sub{color:#94a3b8;font-size:12px;font-weight:400}.user-auth-copy{z-index:1;position:relative}.user-auth-eyebrow{letter-spacing:.2em;color:#93c5fd;margin:0 0 18px;font-size:12px}.user-auth-copy h1{letter-spacing:-.02em;margin:0 0 18px;font-size:36px;line-height:1.3}.user-auth-lead{color:#94a3b8;max-width:420px;margin:0 0 28px;font-size:14px;line-height:1.9}.user-auth-features{gap:12px;margin:0;padding:0;list-style:none;display:grid}.user-auth-features li{color:#cbd5e1;align-items:center;gap:10px;font-size:13px;display:flex}.user-auth-dot{background:#2f6fed40;border:1px solid #93c5fd80;border-radius:50%;flex:none;width:18px;height:18px;position:relative}.user-auth-dot:after{content:"";background:#93c5fd;border-radius:50%;position:absolute;inset:5px}.user-auth-aside-foot{z-index:1;color:#64748b;margin:0;font-size:12px;position:relative}.user-auth-body{justify-content:center;align-items:center;min-height:100vh;padding:40px 24px;display:flex}.user-login-card{background:var(--surface);border:1px solid var(--border);width:100%;max-width:420px;box-shadow:var(--shadow-lg);border-radius:24px;padding:36px 34px}.login-switch{background:var(--surface-soft);border:1px solid var(--border);border-radius:12px;gap:4px;margin-bottom:26px;padding:4px;display:flex}.login-switch 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