:root {
  --bg-primary: #0f172a;
  --bg-card: #1e293b;
  --bg-card-hover: #334155;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent-blue: #3b82f6;
  --accent-green: #22c55e;
  --accent-red: #ef4444;
  --accent-orange: #f97316;
  --accent-purple: #a855f7;
  --accent-yellow: #eab308;
  --accent-cyan: #06b6d4;
  --border: #334155;
  --radius: 12px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Noto Sans SC', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
}

/* ===== Header ===== */
.header {
  background: linear-gradient(135deg, #1e293b, #0f172a);
  border-bottom: 1px solid var(--border);
  padding: 12px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
  gap: 12px;
  flex-wrap: wrap;
}

.header h1 {
  font-size: 20px;
  font-weight: 600;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  white-space: nowrap;
}

.header-actions { display: flex; align-items: center; gap: 12px; white-space: nowrap; }

.btn-primary {
  background: var(--accent-blue);
  color: white;
  border: none;
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 14px;
  cursor: pointer;
  transition: all .2s;
}
.btn-primary:hover { background: #2563eb; transform: translateY(-1px); }

.deadline-badge {
  font-size: 12px;
  color: var(--accent-yellow);
  background: rgba(234, 179, 8, .1);
  border: 1px solid rgba(234, 179, 8, .3);
  padding: 4px 12px;
  border-radius: 6px;
  white-space: nowrap;
}

.update-time { font-size: 12px; color: var(--text-muted); white-space: nowrap; }

/* ===== Navigation Tabs ===== */
.nav-tabs {
  display: flex;
  gap: 4px;
  background: var(--bg-primary);
  border-radius: 10px;
  padding: 4px;
}

.tab {
  background: transparent;
  border: none;
  color: var(--text-muted);
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 13px;
  cursor: pointer;
  transition: all .2s;
  white-space: nowrap;
}
.tab:hover { color: var(--text-primary); background: rgba(255,255,255,.05); }
.tab.active {
  background: var(--accent-blue);
  color: white;
  font-weight: 500;
}

/* ===== Pages ===== */
.page { display: none; }
.page.active { display: block; }

/* ===== Dashboard Layout ===== */
.dashboard {
  padding: 20px 24px;
  max-width: 1400px;
  margin: 0 auto;
}

.section {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 20px;
}

.section h2 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.section-subtitle {
  font-size: 14px;
  font-weight: 600;
  margin-top: 24px;
  margin-bottom: 12px;
  color: var(--text-secondary);
}

/* ===== KPI Grid ===== */
.kpi-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.kpi-card {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
  text-align: center;
  transition: all .2s;
}

.kpi-total {
  margin-bottom: 12px;
}

.kpi-total .kpi-card {
  padding: 24px;
}

.kpi-total .kpi-value {
  font-size: 36px;
}

.calc-chain.cash-chain {
  border-color: var(--accent-purple);
  background: linear-gradient(135deg, #1e293b, #1f1a2e);
}
.kpi-card:hover {
  border-color: var(--accent-blue);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(59, 130, 246, .15);
}

.kpi-label {
  font-size: 12px;
  color: var(--text-secondary);
  margin-bottom: 4px;
}

.kpi-value {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 4px;
}

.kpi-source, .kpi-formula {
  font-size: 11px;
  color: var(--text-muted);
}

/* Card colors */
.sales .kpi-value { color: var(--accent-blue); }
.refund .kpi-value { color: var(--accent-red); }
.net-sales .kpi-value { color: var(--accent-cyan); }
.promo .kpi-value { color: var(--accent-orange); }
.platform .kpi-value { color: var(--accent-yellow); }
.net-income .kpi-value { color: var(--accent-green); }
.supplier .kpi-value { color: var(--accent-purple); }
.operations .kpi-value { color: var(--text-secondary); }
.gross-profit .kpi-value { color: var(--accent-green); font-size: 26px; }
.net-profit .kpi-value { color: var(--accent-green); font-size: 26px; }
.financial .kpi-value { color: var(--accent-cyan); }

/* ===== Calculation Chain ===== */
.calc-chain {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-bottom: 8px;
  flex-wrap: wrap;
}

.calc-chain.final {
  border-color: var(--accent-yellow);
  background: linear-gradient(135deg, #1e293b, #1a2332);
}

.chain-step {
  text-align: center;
  padding: 8px 16px;
  background: var(--bg-card);
  border-radius: 8px;
  min-width: 90px;
}

.chain-step.highlight { border: 1px solid var(--accent-cyan); }
.chain-step.profit { border: 1px solid var(--accent-green); }

.step-label {
  display: block;
  font-size: 11px;
  color: var(--text-secondary);
  margin-bottom: 2px;
}

.step-val {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
}
.chain-step.profit .step-val { color: var(--accent-green); }

.chain-op {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-muted);
}

/* ===== Tables ===== */
.table-wrapper {
  overflow-x: auto;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 600px;
}

.data-table th {
  text-align: left;
  padding: 10px 12px;
  font-size: 12px;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border);
  text-transform: uppercase;
  letter-spacing: .5px;
  white-space: nowrap;
}

.data-table td {
  padding: 10px 12px;
  font-size: 13px;
  border-bottom: 1px solid rgba(51, 65, 85, .5);
  white-space: nowrap;
}

.data-table tr:hover td {
  background: rgba(59, 130, 246, .05);
}

.store-group-header td {
  font-weight: 600;
  font-size: 14px;
  color: var(--accent-blue);
  background: rgba(59, 130, 246, .08);
  border-bottom: 2px solid var(--accent-blue);
  padding: 12px;
}

.empty-state {
  text-align: center;
  color: var(--text-muted);
  padding: 32px !important;
  font-size: 14px;
}

/* ===== 日常运营月度折叠 ===== */
.ops-month {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-bottom: 8px;
  overflow: hidden;
}

.ops-month-header {
  display: flex;
  align-items: center;
  padding: 12px 16px;
  cursor: pointer;
  transition: all .2s;
  user-select: none;
}
.ops-month-header:hover {
  background: rgba(59, 130, 246, .05);
}

.ops-month-name {
  font-weight: 600;
  font-size: 14px;
  color: var(--accent-blue);
  flex: 1;
}

.ops-month-total {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  margin-right: 12px;
}

.ops-expand-icon {
  font-size: 12px;
  color: var(--text-muted);
  transition: transform .2s;
}

.ops-month-detail {
  max-height: 0;
  overflow: hidden;
  transition: max-height .3s ease;
}

.ops-month-detail.open {
  max-height: 2000px;
}

.ops-detail-table {
  border-top: 1px solid var(--border);
}

.ops-detail-table th {
  background: rgba(59, 130, 246, .05);
}

/* ===== Chart ===== */
.chart-container {
  height: 360px;
  overflow-x: auto;
  overflow-y: hidden;
  padding: 12px 0;
}

.chart-container canvas {
  min-width: 700px;
  height: 320px !important;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .header { flex-direction: column; align-items: stretch; }
  .nav-tabs { overflow-x: auto; }
  .kpi-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 480px) {
  .kpi-grid { grid-template-columns: 1fr; }
}