:root{
  --bg:#f4f6fb; --panel:#fff; --ink:#1f2937; --muted:#6b7280; --line:#e5e7eb;
  --brand:#2563eb; --brand-d:#1d4ed8; --brand-soft:#eff6ff;
  --ok:#16a34a; --warn:#d97706; --bad:#dc2626; --purple:#7c3aed;
}
*{box-sizing:border-box}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  background:var(--bg);color:var(--ink);font-size:14px}
button{font-family:inherit}
a{color:var(--brand)}

/* 通用 */
.card{border:1px solid var(--line);border-radius:12px;background:var(--panel);padding:16px 18px;margin-bottom:16px;box-shadow:0 1px 2px rgba(16,24,40,.04)}
.btn{background:var(--brand);color:#fff;border:none;padding:8px 14px;border-radius:8px;cursor:pointer;font-size:13px}
.btn:hover{background:var(--brand-d)}
.btn.ghost{background:#fff;color:var(--brand);border:1px solid var(--brand)}
.btn.sm{padding:5px 10px;font-size:12px}
.btn.danger{background:var(--bad)}
.input,.select{width:100%;padding:8px 10px;border:1px solid var(--line);border-radius:8px;font-size:13px;margin:4px 0 10px}
label.fld{display:block;font-size:12px;color:var(--muted);margin-top:6px}
table{width:100%;border-collapse:collapse;font-size:13px}
th,td{border:1px solid var(--line);padding:8px 10px;text-align:left}
th{background:#f8fafc;color:#334155}
.tag{display:inline-block;font-size:12px;padding:2px 9px;border-radius:999px}
.tag.ok{background:#dcfce7;color:#15803d}
.tag.warn{background:#fef3c7;color:#b45309}
.tag.bad{background:#fee2e2;color:#b91c1c}
.tag.gray{background:#e5e7eb;color:#475569}
.modal-mask{position:fixed;inset:0;background:rgba(15,23,42,.45);display:flex;align-items:flex-start;justify-content:center;padding:30px 12px;z-index:50;overflow:auto}
.modal{background:#fff;border-radius:14px;width:560px;max-width:100%;padding:20px 22px}
.modal h3{margin:0 0 12px}
.row{display:flex;gap:12px;flex-wrap:wrap}
.row > *{flex:1;min-width:140px}
.close{float:right;cursor:pointer;color:var(--muted);font-size:20px;line-height:1}
.notice{background:#fffbeb;border:1px solid #fde68a;color:#92400e;border-radius:10px;padding:10px 12px;font-size:12px;margin:8px 0}

/* 后台布局 */
.topbar{background:linear-gradient(90deg,#1e3a8a,#2563eb);color:#fff;padding:12px 22px;display:flex;justify-content:space-between;align-items:center;position:sticky;top:0;z-index:10}
.topbar .u{font-size:13px}
.topbar .logout{background:rgba(255,255,255,.18);border:none;color:#fff;padding:6px 12px;border-radius:8px;cursor:pointer}
.admin{display:flex;max-width:1280px;margin:0 auto}
.side{width:180px;flex:0 0 180px;padding:18px 10px;background:var(--panel);min-height:calc(100vh - 52px);border-right:1px solid var(--line)}
.side .nav{display:block;padding:10px 14px;border-radius:8px;color:var(--muted);cursor:pointer;margin-bottom:4px;font-size:14px}
.side .nav.active{background:var(--brand-soft);color:var(--brand);font-weight:600}
.content{flex:1;padding:22px 26px;min-width:0}
.stat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.stat{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:16px}
.stat .v{font-size:26px;font-weight:700;color:var(--brand)}
.stat .k{color:var(--muted);font-size:13px}
@media(max-width:900px){.side{display:none}.stat-grid{grid-template-columns:repeat(2,1fr)}}

/* 地图 */
#map{width:100%;height:240px;border:1px solid var(--line);border-radius:8px;background:#eef2f7}

/* 移动端 */
.mobile{max-width:480px;margin:0 auto;background:#fff;min-height:100vh;min-height:100dvh;padding-bottom:calc(72px + env(safe-area-inset-bottom,0px));-webkit-tap-highlight-color:transparent}
.m-top{background:linear-gradient(90deg,#1e3a8a,#2563eb);color:#fff;padding:calc(12px + env(safe-area-inset-top,0px)) 16px 12px;display:flex;justify-content:space-between;align-items:center;position:sticky;top:0;z-index:10}
.m-top b{font-size:16px}
.m-top .logout{background:rgba(255,255,255,.18);border:none;color:#fff;padding:7px 12px;border-radius:8px;cursor:pointer;font-size:13px}
.m-body{padding:14px 16px;touch-action:manipulation}
.task{border:1px solid var(--line);border-radius:12px;padding:13px 14px;margin-bottom:12px;background:#fff;box-shadow:0 1px 2px rgba(16,24,40,.05)}
.task:active{background:#f8fafc}
.task .t{font-weight:600;font-size:15px;word-break:break-all}
.step{border:1px solid var(--line);border-radius:10px;padding:13px;margin:10px 0;background:#f8fafc}
.step b{font-size:14px}
.step .opt{display:flex;gap:8px;margin-top:8px;flex-wrap:wrap}
.chip-opt{border:1px solid var(--line);border-radius:999px;padding:9px 16px;cursor:pointer;font-size:14px;background:#fff;touch-action:manipulation}
.chip-opt.on{background:var(--brand);color:#fff;border-color:var(--brand)}
.chip-opt:active{transform:scale(.97)}
.thumb{width:64px;height:64px;object-fit:cover;border-radius:8px;border:1px solid var(--line);margin:4px 4px 0 0}
.thumb-add{display:inline-flex;align-items:center;justify-content:center;width:64px;height:64px;background:#f1f5f9;cursor:pointer;color:var(--muted);font-size:20px;border-radius:8px;border:1px dashed var(--line);margin:4px 4px 0 0;vertical-align:top}
.bottom-nav{position:fixed;bottom:0;left:50%;transform:translateX(-50%);width:480px;max-width:100%;background:#fff;border-top:1px solid var(--line);display:flex;box-shadow:0 -2px 10px rgba(16,24,40,.06);padding-bottom:env(safe-area-inset-bottom,0px)}
.bottom-nav div{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;padding:8px 0 10px;font-size:12px;color:var(--muted);cursor:pointer;touch-action:manipulation}
.bottom-nav div svg{width:22px;height:22px}
.bottom-nav div.active{color:var(--brand);font-weight:600}
.bottom-nav div:active{background:#f1f5f9}
.login-box{max-width:320px;margin:64px auto;background:#fff;border:1px solid var(--line);border-radius:14px;padding:26px 24px;box-shadow:0 4px 18px rgba(16,24,40,.07)}

/* 小屏优化（≤480px 手机） */
@media(max-width:480px){
  body{font-size:15px}
  .input,.select{padding:10px 12px;font-size:15px;margin:4px 0 12px}
  .btn{padding:10px 16px;font-size:15px;border-radius:9px}
  .btn.sm{padding:6px 12px;font-size:13px}
  .m-body{padding:12px}
  .m-top{padding-left:12px;padding-right:12px}
  .thumb{width:60px;height:60px}
  .thumb-add{width:60px;height:60px}
}