/* ── Reset & Base ──────────────────────────────────────────── */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background: #0f0f1a;
  color: #fff;
  font-family: 'Inter', system-ui, sans-serif;
  min-height: 100vh;
}

.app-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 24px;
}

/* ── Header ────────────────────────────────────────────────── */
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 0 0 20px 0;
  border-bottom: 1px solid #4ade80;
  margin-bottom: 40px;
}

.btn-new-file {
  background: transparent;
  border: 1px solid #4ade80;
  color: #4ade80;
  padding: 6px 16px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.85rem;
  transition: background 0.2s;
}
.btn-new-file:hover { background: rgba(74,222,128,0.1); }

.logo {
  font-size: 1.4rem;
  font-weight: 700;
  color: #4ade80;
}

.header-subtitle {
  color: #94a3b8;
  font-size: 0.85rem;
}

/* ── Upload Zone ───────────────────────────────────────────── */
.upload-section {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 60px 0;
}

.drop-zone {
  border: 2px dashed #2a2a4a;
  border-radius: 16px;
  padding: 60px;
  text-align: center;
  transition: border-color 0.2s, background 0.2s;
  min-width: 400px;
}

.drop-zone:hover {
  border-color: #4ade80;
}

.drop-zone.drag-over {
  border-color: #4ade80;
  background: rgba(74, 222, 128, 0.05);
}

.drop-icon {
  font-size: 3rem;
  margin-bottom: 16px;
}

.drop-zone p {
  color: #94a3b8;
  margin-bottom: 8px;
}

.drop-sub {
  color: #2a2a4a;
  font-size: 0.85rem;
  margin-bottom: 16px !important;
}

.btn-upload {
  display: inline-block;
  background: #4ade80;
  color: #000;
  padding: 10px 24px;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.9rem;
  transition: opacity 0.2s;
}

.btn-upload:hover {
  opacity: 0.85;
}

.upload-status {
  margin-top: 16px;
  text-align: center;
  font-size: 0.9rem;
}

.upload-status.success { color: #4ade80; }
.upload-status.error   { color: #ef4444; }

/* ── KPI Cards ─────────────────────────────────────────────── */
.kpi-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 24px;
}

.kpi-card {
  background: #1a1a2e;
  border: 1px solid #2a2a4a;
  border-radius: 12px;
  padding: 20px;
}

.kpi-icon {
  font-size: 1.5rem;
  margin-bottom: 8px;
}

.kpi-label {
  color: #94a3b8;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.kpi-value {
  font-size: 1.8rem;
  font-weight: 700;
  color: #4ade80;
  margin-top: 8px;
}

/* ── Filters Bar ───────────────────────────────────────────── */
.filters-bar {
  background: #1a1a2e;
  border: 1px solid #2a2a4a;
  border-radius: 12px;
  padding: 16px;
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  align-items: flex-end;
  margin-bottom: 24px;
}

.filter-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 120px;
}

.filter-group label {
  color: #94a3b8;
  font-size: 0.75rem;
}

select,
input[type="date"] {
  background: #0f0f1a;
  color: #fff;
  border: 1px solid #2a2a4a;
  border-radius: 6px;
  padding: 6px 10px;
  font-size: 0.85rem;
}

select:focus,
input[type="date"]:focus {
  outline: none;
  border-color: #4ade80;
}

.btn-reset {
  background: transparent;
  border: 1px solid #ef4444;
  color: #ef4444;
  padding: 8px 16px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.85rem;
  align-self: flex-end;
  transition: background 0.2s;
}

.btn-reset:hover {
  background: rgba(239, 68, 68, 0.1);
}

/* ── Charts Grid ───────────────────────────────────────────── */
.charts-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.chart-card {
  background: #1a1a2e;
  border: 1px solid #2a2a4a;
  border-radius: 12px;
  padding: 20px;
}

.chart-wide {
  grid-column: 1 / -1;
}

.chart-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.chart-header span {
  font-weight: 600;
  color: #fff;
}

/* ── Toggle Buttons ────────────────────────────────────────── */
.toggle-group {
  display: flex;
  gap: 4px;
}

.toggle-btn {
  background: transparent;
  border: 1px solid #2a2a4a;
  color: #94a3b8;
  padding: 4px 12px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.8rem;
  transition: all 0.2s;
}

.toggle-btn.active {
  background: #4ade80;
  color: #000;
  border-color: #4ade80;
}

/* ── Multi-select dropdowns ────────────────────────────────── */
select[multiple] {
  height: 80px;
  font-size: 0.8rem;
}

select[multiple] option:checked {
  background: #4ade80;
  color: #000;
}

/* ── Canvas Heights ────────────────────────────────────────── */
.chart-card canvas {
  max-height: 300px;
}

.chart-wide canvas {
  max-height: 260px;
}

/* ── Responsive ────────────────────────────────────────────── */
@media (max-width: 900px) {
  .kpi-row {
    grid-template-columns: repeat(2, 1fr);
  }
  .charts-grid {
    grid-template-columns: 1fr;
  }
  .chart-wide {
    grid-column: 1;
  }
  .filters-bar {
    flex-direction: column;
    align-items: stretch;
  }
}

@media (max-width: 500px) {
  .kpi-row {
    grid-template-columns: 1fr;
  }
  .kpi-value {
    font-size: 1.4rem;
  }
}

/* ── Empty State ───────────────────────────────────────────── */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: #94a3b8;
  font-size: 1rem;
}
.empty-state button {
  display: block;
  margin: 12px auto 0;
  background: #4ade80;
  color: #000;
  border: none;
  padding: 8px 20px;
  border-radius: 6px;
  cursor: pointer;
  font-weight: 600;
}

/* ── Utilities ─────────────────────────────────────────────── */
.hidden {
  display: none !important;
}