/* ========== Global Reset & Variables ========== */
:root {
  --bg: #f7f8fa; --card: #fff;
  --primary: #4a6cf7; --primary-light: #eef1fe; --primary-dark: #3d5bd6;
  --danger: #f56c6c; --danger-light: #fef0f0;
  --warning: #e6a23c; --warning-light: #fdf6ec;
  --success: #67c23a; --success-light: #f0f9eb;
  --info: #909399; --text: #303133; --text-secondary: #606266;
  --text-muted: #909399; --border: #ebeef5;
  --shadow: 0 2px 12px rgba(0,0,0,0.06); --radius: 10px;
}
* { margin:0; padding:0; box-sizing:border-box; }
body { font-family:-apple-system,"PingFang SC","Microsoft YaHei",sans-serif; background:var(--bg); color:var(--text); font-size:14px; line-height:1.6; }

/* ========== Layout ========== */
.page { max-width:1100px; margin:0 auto; padding:20px 24px; }
.header { background:linear-gradient(135deg,#4a6cf7,#6c8cff); color:#fff; padding:16px 24px; display:flex; align-items:center; justify-content:space-between; }
.header h1 { font-size:20px; font-weight:700; }
.header .user-info { font-size:13px; opacity:.9; display:flex; align-items:center; gap:12px; }
.header .user-info button { background:rgba(255,255,255,.2); color:#fff; border:none; padding:5px 14px; border-radius:4px; cursor:pointer; font-size:12px; }
.header .user-info button:hover { background:rgba(255,255,255,.35); }

/* Nav */
.nav { background:var(--card); border-bottom:1px solid var(--border); display:flex; gap:0; padding:0 24px; overflow-x:auto; }
.nav-item { padding:12px 20px; font-size:13px; color:var(--text-secondary); cursor:pointer; border-bottom:2px solid transparent; white-space:nowrap; transition:.15s; text-decoration:none; }
.nav-item:hover { color:var(--primary); }
.nav-item.active { color:var(--primary); border-bottom-color:var(--primary); font-weight:600; }

/* Card */
.card { background:var(--card); border-radius:var(--radius); box-shadow:var(--shadow); padding:20px; margin-bottom:16px; }
.card-title { font-size:15px; font-weight:600; margin-bottom:14px; display:flex; align-items:center; gap:8px; }

/* Metric cards grid */
.metrics { display:grid; grid-template-columns:repeat(4,1fr); gap:14px; margin-bottom:16px; }
.mcard { background:var(--card); border-radius:var(--radius); box-shadow:var(--shadow); padding:18px; text-align:center; }
.mcard .val { font-size:28px; font-weight:700; }
.mcard .lbl { font-size:12px; color:var(--text-muted); margin-top:2px; }
.mcard .sub { font-size:11px; margin-top:3px; }

/* Grid */
.grid-2 { display:grid; grid-template-columns:1fr 1fr; gap:16px; }
.grid-3 { display:grid; grid-template-columns:1fr 1fr 1fr; gap:14px; }

/* Tables */
.table-wrap { overflow-x:auto; }
table { width:100%; border-collapse:collapse; font-size:13px; }
th { background:#f5f7fa; color:var(--text-secondary); font-weight:600; text-align:left; padding:9px 11px; border-bottom:1px solid var(--border); white-space:nowrap; }
td { padding:9px 11px; border-bottom:1px solid var(--border); }
tr:hover td { background:#fafbfc; }

/* Tags */
.tag { display:inline-block; padding:2px 9px; border-radius:4px; font-size:11px; font-weight:500; }
.tag-red { background:var(--danger-light); color:var(--danger); }
.tag-yellow { background:var(--warning-light); color:var(--warning); }
.tag-green { background:var(--success-light); color:var(--success); }
.tag-blue { background:var(--primary-light); color:var(--primary); }
.tag-gray { background:#f4f4f5; color:var(--info); }
.tag-solid-red { background:var(--danger); color:#fff; }
.tag-solid-green { background:var(--success); color:#fff; }

/* Buttons */
.btn { display:inline-block; padding:7px 18px; border-radius:6px; font-size:13px; border:none; cursor:pointer; transition:.15s; }
.btn-primary { background:var(--primary); color:#fff; }
.btn-primary:hover { background:var(--primary-dark); }
.btn-danger { background:var(--danger); color:#fff; }
.btn-danger:hover { background:#e05151; }
.btn-outline { background:#fff; border:1px solid var(--border); color:var(--text-secondary); }
.btn-outline:hover { border-color:var(--primary); color:var(--primary); }
.btn-sm { padding:4px 10px; font-size:11px; }
.btn-xs { padding:2px 8px; font-size:11px; }

/* Alerts */
.alert { padding:10px 14px; border-radius:6px; font-size:13px; margin-bottom:12px; display:flex; align-items:flex-start; gap:8px; }
.alert-red { background:var(--danger-light); color:var(--danger); border-left:3px solid var(--danger); }
.alert-yellow { background:var(--warning-light); color:var(--warning); border-left:3px solid var(--warning); }
.alert-blue { background:var(--primary-light); color:var(--primary); border-left:3px solid var(--primary); }

/* Forms */
.form-group { margin-bottom:14px; }
.form-label { display:block; font-size:12px; color:var(--text-muted); margin-bottom:5px; font-weight:500; }
.form-label .required { color:var(--danger); }
.form-input,.form-select,.form-textarea { width:100%; border:1px solid var(--border); border-radius:6px; padding:8px 12px; font-size:13px; color:var(--text); background:#fff; }
.form-input:focus,.form-select:focus,.form-textarea:focus { outline:none; border-color:var(--primary); box-shadow:0 0 0 2px rgba(74,108,247,.15); }
.form-textarea { min-height:70px; resize:vertical; }
.form-row { display:flex; gap:12px; align-items:center; }
.form-row .form-group { flex:1; margin-bottom:0; }

/* Modal */
.modal-overlay { display:none; position:fixed; top:0; left:0; width:100%; height:100%; background:rgba(0,0,0,0.4); z-index:1000; justify-content:center; align-items:center; }
.modal-overlay.show { display:flex; }
.modal { background:#fff; border-radius:var(--radius); width:95%; max-width:560px; max-height:85vh; overflow-y:auto; box-shadow:0 8px 30px rgba(0,0,0,0.15); }
.modal-header { padding:16px 20px; border-bottom:1px solid var(--border); display:flex; align-items:center; justify-content:space-between; font-size:15px; font-weight:600; }
.modal-body { padding:20px; }
.modal-footer { padding:12px 20px; border-top:1px solid var(--border); display:flex; justify-content:flex-end; gap:10px; }
.modal-close { background:none; border:none; font-size:20px; cursor:pointer; color:var(--text-muted); }

/* Timeline */
.timeline { position:relative; padding-left:20px; }
.timeline::before { content:""; position:absolute; left:6px; top:4px; bottom:4px; width:2px; background:var(--border); }
.timeline-item { position:relative; padding-bottom:14px; }
.timeline-item::before { content:""; position:absolute; left:-17px; top:6px; width:8px; height:8px; border-radius:50%; background:var(--primary); border:2px solid #fff; box-shadow:0 0 0 2px var(--primary); }
.timeline-item.warn::before { background:var(--warning); box-shadow:0 0 0 2px var(--warning); }
.timeline-item.bad::before { background:var(--danger); box-shadow:0 0 0 2px var(--danger); }
.timeline-time { font-size:11px; color:var(--text-muted); }
.timeline-content { font-size:12px; color:var(--text-secondary); margin-top:2px; }
.timeline-intention { font-size:11px; margin-top:3px; }

/* Filter bar */
.filter-bar { display:flex; gap:10px; align-items:center; flex-wrap:wrap; margin-bottom:16px; }
.filter-bar select,.filter-bar input { border:1px solid var(--border); border-radius:6px; padding:6px 10px; font-size:12px; background:#fff; }
.filter-bar select:focus,.filter-bar input:focus { outline:none; border-color:var(--primary); }

/* Pagination */
.pagination { display:flex; justify-content:center; gap:4px; margin-top:12px; }
.pagination button { background:#fff; border:1px solid var(--border); padding:5px 10px; border-radius:4px; font-size:12px; cursor:pointer; min-width:30px; }
.pagination button:hover { border-color:var(--primary); color:var(--primary); }
.pagination button.active { background:var(--primary); color:#fff; border-color:var(--primary); }
.pagination button:disabled { opacity:.4; cursor:not-allowed; }

/* Chart containers */
.chart-area { display:flex; align-items:flex-end; gap:3px; height:120px; padding:8px 0; }
.chart-bar { flex:1; border-radius:3px 3px 0 0; min-width:28px; position:relative; }
.chart-bar .bar-value { position:absolute; top:-16px; left:50%; transform:translateX(-50%); font-size:10px; font-weight:600; }
.chart-bar .bar-label { position:absolute; bottom:-18px; left:50%; transform:translateX(-50%); font-size:9px; color:var(--text-muted); white-space:nowrap; }

/* Loading */
.loading { text-align:center; padding:40px; color:var(--text-muted); font-size:14px; }
.empty { text-align:center; padding:30px; color:var(--text-muted); font-size:13px; }

/* Tabs */
.tab-bar { display:flex; gap:0; border-bottom:1px solid var(--border); margin-bottom:16px; }
.tab-item { padding:8px 16px; font-size:13px; color:var(--text-secondary); cursor:pointer; border-bottom:2px solid transparent; }
.tab-item.active { color:var(--primary); border-bottom-color:var(--primary); font-weight:500; }

/* Login page */
.login-page { min-height:100vh; display:flex; align-items:center; justify-content:center; background:linear-gradient(135deg,#eef1fe,#f7f8fa); }
.login-box { background:#fff; border-radius:12px; box-shadow:0 4px 24px rgba(0,0,0,0.08); padding:40px; width:380px; max-width:90%; }
.login-box h1 { font-size:22px; text-align:center; margin-bottom:4px; }
.login-box .subtitle { text-align:center; font-size:13px; color:var(--text-muted); margin-bottom:28px; }
.login-error { color:var(--danger); font-size:12px; text-align:center; margin-top:10px; display:none; }

/* Progress bar in dashboard */
.progress-bar { background:#ebeef5; border-radius:8px; height:6px; margin-top:6px; overflow:hidden; }
.progress-fill { height:100%; border-radius:8px; transition:width .4s ease; }

/* Responsive */
@media(max-width:768px) {
  .metrics { grid-template-columns:repeat(2,1fr); }
  .grid-2,.grid-3 { grid-template-columns:1fr; }
  .header { flex-direction:column; gap:8px; }
}