:root{
  --bg:#eef3fb; --bg2:#ffffff; --panel:#ffffff; --panel2:#e6edf7;
  --line:#d2dbe8; --txt:#16202e; --muted:#65748a; --accent:#1b7fd6; --accent2:#0a9d7a;
  --danger:#e23b4e; --warn:#c77a00; --ok:#0a9d7a;
}
*{box-sizing:border-box}
html,body{margin:0;height:100%;font-family:"Segoe UI","PingFang SC","Microsoft YaHei",system-ui,sans-serif;color:var(--txt)}
body{overflow:hidden}
.hidden{display:none !important}
button{font-family:inherit;cursor:pointer;border:none;border-radius:8px;padding:10px 18px;font-size:14px;background:var(--panel2);color:var(--txt);transition:.15s}
button:hover{filter:brightness(.97)}
button:disabled{opacity:.5;cursor:not-allowed}
button.primary{background:linear-gradient(135deg,var(--accent),#1565c0);color:#fff;font-weight:600}
button.danger{background:var(--danger);color:#fff}
button.mini{padding:5px 10px;font-size:12px;background:var(--panel2)}
button.tool{background:#fff;border:1px solid var(--line)}
input,textarea,select{font-family:inherit;background:var(--bg2);color:var(--txt);border:1px solid var(--line);border-radius:8px;padding:10px 12px;font-size:14px;outline:none}
input:focus,textarea:focus,select:focus{border-color:var(--accent)}
textarea{resize:vertical}
code,pre{font-family:"Cascadia Code",Consolas,monospace}

/* 背景 */
.gate-bg{background:linear-gradient(rgba(255,255,255,.82),rgba(255,255,255,.82)),url('/assets/bg.jpg') center/cover no-repeat fixed}
.admin-bg{background:#eef3fb}

/* 授权门 / 登录 */
.gate{position:fixed;inset:0;display:flex;align-items:center;justify-content:center}
.gate-card{background:rgba(255,255,255,.94);border:1px solid var(--line);border-radius:18px;padding:42px 38px;width:420px;text-align:center;box-shadow:0 20px 60px rgba(20,40,70,.18)}
.logo{display:block;width:min(420px,82%);height:auto;max-height:160px;object-fit:contain;margin:0 auto 18px}
.gate-card h1{font-size:22px;margin:6px 0 4px;color:var(--txt)}
.sub{color:var(--muted);font-size:12px;letter-spacing:1px;margin:0 0 22px}
.gate-card input{width:100%;margin-bottom:14px;text-align:center;letter-spacing:2px}
.gate-card button{width:100%}
.err{color:var(--danger);font-size:13px;min-height:18px;margin-top:8px}

/* 工作区 */
.workspace{position:fixed;inset:0;display:flex;flex-direction:column}
.topbar{height:56px;display:flex;align-items:center;justify-content:space-between;padding:0 18px;background:rgba(255,255,255,.96);border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;gap:10px;font-weight:600;color:var(--txt)}
.logo-sm{height:34px;width:auto;max-width:140px;object-fit:contain}
.badge{font-size:11px;color:var(--muted);border:1px solid var(--line);padding:2px 8px;border-radius:20px;background:#fff}
.countdown{font-variant-numeric:tabular-nums;font-size:18px;font-weight:700;color:var(--warn);background:rgba(199,122,0,.12);padding:4px 14px;border-radius:20px;border:1px solid rgba(199,122,0,.35)}
.content{flex:1;position:relative;background:#fff}
.panel-frame{width:100%;height:100%;border:none;background:#fff}

/* 终端（保持深色，符合终端惯例，便于阅读） */
.terminal{position:absolute;inset:0;display:flex;flex-direction:column;background:#04101f}
.term-out{flex:1;overflow:auto;padding:14px;font-family:"Cascadia Code",Consolas,monospace;font-size:13px;line-height:1.45;white-space:pre-wrap;color:#cfe6ff}
.term-bar{display:flex;gap:8px;padding:8px;border-top:1px solid #16406e;background:#0a1a30}
.term-in{flex:1;min-height:42px;max-height:120px;font-family:monospace;background:#04101f;color:#cfe6ff;border:1px solid #16406e}
.term-tools{display:flex;gap:8px;align-items:center;padding:6px 10px;background:#0a1a30;border-top:1px solid #16406e}
.term-tools button.tool{background:rgba(255,255,255,.1);color:#cfe6ff;border:1px solid #16406e}
.term-status{margin-left:auto;color:#8fb0d6;font-size:12px}

.expire-mask{position:absolute;inset:0;background:rgba(238,243,251,.92);display:flex;align-items:center;justify-content:center;z-index:50}
.expire-box{text-align:center;font-size:26px;font-weight:700;color:var(--txt)}
.expire-box small{display:block;margin-top:8px;color:var(--muted);font-size:14px;font-weight:400}

/* 后台 */
.admin-app{position:fixed;inset:0;display:flex}
.sidebar{width:210px;background:rgba(255,255,255,.96);border-right:1px solid var(--line);display:flex;flex-direction:column;padding:18px 12px}
.side-brand{display:flex;align-items:center;gap:8px;font-weight:700;margin-bottom:22px;padding:0 6px;color:var(--txt)}
.sidebar nav{display:flex;flex-direction:column;gap:6px;flex:1}
.nav-btn{text-align:left;background:transparent;border:1px solid transparent;color:var(--txt)}
.nav-btn.active{background:linear-gradient(135deg,var(--accent),#1565c0);color:#fff}
.logout{background:transparent;border:1px solid var(--line);color:var(--muted)}
.main{flex:1;overflow:auto;padding:26px 32px;background:var(--bg)}
.main h2{margin-top:0;color:var(--txt)}
.tab h3{margin:18px 0 8px;color:var(--txt)}
.row{display:flex;align-items:center;gap:12px;margin-bottom:12px}
.hint{color:var(--muted);font-size:12px}
hr{border:none;border-top:1px solid var(--line);margin:22px 0}

.tbl{width:100%;border-collapse:collapse;font-size:13px;background:#fff;border:1px solid var(--line);border-radius:10px;overflow:hidden}
.tbl th,.tbl td{border-bottom:1px solid var(--line);padding:9px 10px;text-align:left;color:var(--txt)}
.tbl th{color:var(--muted);font-weight:600;background:#f3f7fc}
.tbl tbody tr:hover{background:#f1f6fc}

.panel-form{max-width:560px;background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:18px;margin-bottom:16px;display:flex;flex-direction:column;gap:12px}
.panel-form label{display:flex;flex-direction:column;gap:5px;font-size:13px;color:var(--muted)}
.panel-form input,.panel-form select,.panel-form textarea{color:var(--txt)}

/* 机器人 */
.robot-list{display:flex;flex-direction:column;gap:8px;margin-bottom:10px}
.robot-item{display:flex;align-items:center;justify-content:space-between;background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:12px 14px}
.status{font-size:12px;padding:3px 10px;border-radius:20px}
.status.on{background:rgba(10,157,122,.14);color:var(--ok)}
.status.off{background:rgba(226,59,78,.14);color:var(--danger)}
.qr-box{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:18px;text-align:center;max-width:320px}
.qr-box img{width:240px;height:240px;background:#fff;border-radius:8px;padding:8px}
.verify-guide{background:rgba(27,127,214,.08);border:1px solid var(--line);border-radius:12px;padding:16px;max-width:560px}
.verify-guide pre{background:#04101f;padding:10px 14px;border-radius:8px;color:var(--accent2);font-size:14px;overflow:auto;color:#7fe3c4}

.sim{display:grid;grid-template-columns:1fr 1fr 1.3fr;gap:14px}
.sim-col{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:14px;display:flex;flex-direction:column;gap:8px}
.sim-col h4{margin:0 0 4px;color:var(--txt)}
.sim-col input,.sim-col textarea{font-size:13px}
.sim-log .event-log{flex:1;max-height:320px;overflow:auto;background:#04101f;border-radius:8px;padding:10px;font-size:12px;line-height:1.6;color:#cfe6ff}
.ev{white-space:pre-wrap;word-break:break-all;border-bottom:1px dashed rgba(255,255,255,.08);padding:4px 0}

@media (max-width:900px){.sim{grid-template-columns:1fr}.sidebar{width:150px}}