:root {
  --card: #ffffff;
  --ink: #0f172a;
  --muted: #64748b;
  --line: #e2e8f0;
  --brand: #2563eb;
  --brand2: #7c3aed;
  --ok: #16a34a;
  --shadow: 0 10px 30px rgba(15, 23, 42, .08);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Inter", system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  color: var(--ink);
  background: #f1f5f9;
}

.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 22px 32px;
  background: linear-gradient(120deg, #0f172a 0%, #1e3a8a 55%, #4c1d95 100%);
  color: #fff;
}
.brand { display: flex; align-items: center; gap: 16px; }
.logo {
  width: 56px; height: 56px; border-radius: 16px;
  display: grid; place-items: center; font-size: 28px;
  background: rgba(255, 255, 255, .12);
}
.topbar h1 { margin: 0; font-size: 22px; font-weight: 800; letter-spacing: -.02em; }
.subtitle { margin: 2px 0 0; font-size: 13px; opacity: .8; }
.period { font-size: 13px; font-weight: 600; padding: 8px 14px; border-radius: 999px; background: rgba(255, 255, 255, .14); }

/* Tabs */
.tabs { display: flex; gap: 8px; padding: 14px 32px 0; background: #fff; border-bottom: 1px solid var(--line); }
.tab {
  border: none; background: transparent; cursor: pointer;
  font: 600 15px/1 "Inter", sans-serif; color: var(--muted);
  padding: 12px 18px; border-radius: 10px 10px 0 0;
  border-bottom: 3px solid transparent; transition: .15s;
}
.tab:hover { color: var(--ink); background: #f8fafc; }
.tab.active { color: var(--brand); border-bottom-color: var(--brand); }

.wrap { max-width: 1280px; margin: 0 auto; padding: 24px 24px 48px; }

/* Upload bar */
.uploadbar {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; flex-wrap: wrap;
  background: var(--card); border: 1px solid var(--line); border-radius: 14px;
  padding: 14px 18px; box-shadow: var(--shadow); margin-bottom: 20px;
}
.upload-info { display: flex; flex-direction: column; }
.upload-info > span:first-child { font-weight: 700; font-size: 15px; }
.status { font-size: 13px; color: var(--muted); margin-top: 2px; }
.status.ok { color: var(--ok); font-weight: 600; }
.btn-upload {
  display: inline-flex; align-items: center; gap: 8px; cursor: pointer;
  background: linear-gradient(120deg, var(--brand), var(--brand2)); color: #fff;
  font-weight: 600; font-size: 14px; padding: 11px 18px; border-radius: 10px;
  box-shadow: 0 6px 16px rgba(37, 99, 235, .3); transition: .15s;
}
.btn-upload:hover { filter: brightness(1.07); transform: translateY(-1px); }
.btn-upload.loading { opacity: .6; pointer-events: none; }

.empty-hint {
  background: #fff7ed; border: 1px dashed #fdba74; color: #9a3412;
  border-radius: 14px; padding: 28px; text-align: center; font-size: 15px; margin-bottom: 20px;
}

/* KPI */
.kpi-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 16px; margin-bottom: 24px; }
.kpi { background: var(--card); border-radius: 18px; padding: 18px 20px; box-shadow: var(--shadow); border: 1px solid var(--line); position: relative; overflow: hidden; }
.kpi::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 5px; background: linear-gradient(var(--brand), var(--brand2)); }
.kpi .val { font-size: 28px; font-weight: 800; letter-spacing: -.03em; }
.kpi .lbl { font-size: 13px; color: var(--muted); margin-top: 4px; }
.kpi .sub { font-size: 12px; font-weight: 600; margin-top: 6px; color: var(--ok); }

/* Charts grid */
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.card { background: var(--card); border-radius: 18px; padding: 18px 18px 8px; box-shadow: var(--shadow); border: 1px solid var(--line); min-height: 300px; display: flex; flex-direction: column; }
.card h3 { margin: 0 0 12px; font-size: 15px; font-weight: 700; }
.card canvas { flex: 1; max-height: 280px; }
.span-2 { grid-column: span 2; }

.foot { text-align: center; color: var(--muted); font-size: 12px; margin-top: 28px; }

@media (max-width: 960px) { .grid { grid-template-columns: 1fr 1fr; } .span-2 { grid-column: span 2; } }
@media (max-width: 620px) {
  .grid { grid-template-columns: 1fr; } .span-2 { grid-column: span 1; }
  .topbar { flex-direction: column; gap: 12px; align-items: flex-start; }
}