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

:root {
  --bg: #f5f7fa;
  --surface: #ffffff;
  --border: #dde2e8;
  --text: #1a1d23;
  --muted: #6b7280;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --green: #16a34a;
  --red: #dc2626;
  --yellow: #d97706;
  --radius: 8px;
}

body { font-family: system-ui, sans-serif; font-size: 14px; background: var(--bg); color: var(--text); }

/* Nav */
.topnav {
  display: flex; align-items: center; gap: 1.5rem;
  background: var(--surface); border-bottom: 1px solid var(--border);
  padding: 0.75rem 1.5rem; position: sticky; top: 0; z-index: 100;
}
.nav-title { font-weight: 700; font-size: 1rem; }
.nav-links { display: flex; gap: 1rem; flex: 1; }
.nav-links a { text-decoration: none; color: var(--muted); padding: 0.25rem 0.5rem; border-radius: 4px; }
.nav-links a.active, .nav-links a:hover { color: var(--primary); background: #eff6ff; }
.config-btn { font-size: 1.2rem; text-decoration: none; color: var(--muted); margin-left: auto; }
.config-btn.active { color: var(--primary); }

/* Layout */
.container { max-width: 1400px; margin: 0 auto; padding: 1.5rem; }
section { margin-top: 1.5rem; }
h3 { font-size: 0.95rem; font-weight: 600; margin-bottom: 0.75rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.05em; }

/* Toolbar */
.toolbar { display: flex; gap: 0.75rem; flex-wrap: wrap; margin-bottom: 1rem; }

/* Buttons */
button, .btn {
  display: inline-flex; align-items: center; gap: 0.4rem;
  padding: 0.5rem 1rem; border-radius: var(--radius);
  border: none; cursor: pointer; font-size: 0.875rem; font-weight: 500;
  background: var(--primary); color: white; text-decoration: none;
  transition: background 0.15s;
}
button:hover, .btn:hover { background: var(--primary-hover); }
button:disabled { opacity: 0.5; cursor: not-allowed; }
button.secondary { background: var(--surface); color: var(--text); border: 1px solid var(--border); }
button.secondary:hover { background: var(--bg); }
button.icon-btn { background: none; color: var(--muted); padding: 0.25rem 0.4rem; font-size: 1rem; }
button.icon-btn:hover { color: var(--text); background: var(--bg); }
button.icon-btn.danger:hover { color: var(--red); }

/* Stats */
.stats-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 1rem;
}
.stat-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 1.25rem; text-align: center;
}
.stat-card.income .stat-value { color: var(--green); }
.stat-card.positive .stat-value { color: var(--green); }
.stat-card.negative .stat-value { color: var(--red); }
.stat-label { font-size: 0.8rem; color: var(--muted); margin-bottom: 0.4rem; text-transform: uppercase; letter-spacing: 0.04em; }
.stat-value { font-size: 1.5rem; font-weight: 700; }

.stats-categories { margin-top: 1rem; }
.cat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 0.75rem; }
.cat-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 1rem; text-align: center; }
.cat-label { font-size: 0.75rem; color: var(--muted); margin-bottom: 0.3rem; }
.cat-value { font-size: 1.1rem; font-weight: 600; }

/* Scan status */
.scan-status {
  background: #eff6ff; border: 1px solid #bfdbfe; border-radius: var(--radius);
  padding: 0.75rem 1rem; margin-bottom: 1rem; font-size: 0.875rem;
}
.scan-status .error { color: var(--red); }

/* Tables */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; background: var(--surface); border-radius: var(--radius); overflow: hidden; border: 1px solid var(--border); }
th { background: var(--bg); font-size: 0.75rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.04em; color: var(--muted); padding: 0.6rem 0.75rem; text-align: left; border-bottom: 1px solid var(--border); white-space: nowrap; }
td { padding: 0.5rem 0.75rem; border-bottom: 1px solid var(--border); vertical-align: middle; }
tr:last-child td { border-bottom: none; }
tr:hover td { background: #f8fafc; }
td.pos { color: var(--green); font-weight: 600; }
td.neg { color: var(--red); font-weight: 600; }
td.measured { color: var(--primary); font-size: 0.85em; }
td.epkwh { color: var(--muted); font-size: 0.85em; }

/* Modals */
.modal {
  position: fixed; inset: 0; background: rgba(0,0,0,0.4); z-index: 200;
  display: flex; align-items: center; justify-content: center;
}
.modal.hidden { display: none; }
.modal-box {
  background: var(--surface); border-radius: var(--radius);
  padding: 1.5rem; width: 560px; max-width: 95vw; max-height: 90vh; overflow-y: auto;
  box-shadow: 0 20px 60px rgba(0,0,0,0.2);
}
.modal-box h2 { font-size: 1rem; margin-bottom: 1rem; }
.modal-actions { display: flex; gap: 0.5rem; margin-top: 1.25rem; flex-wrap: wrap; }

/* Forms */
.form-grid, .edit-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; margin-bottom: 0.75rem;
}
label { display: flex; flex-direction: column; gap: 0.25rem; font-size: 0.8rem; font-weight: 500; color: var(--muted); }
input, select {
  padding: 0.4rem 0.6rem; border: 1px solid var(--border); border-radius: 4px;
  font-size: 0.875rem; color: var(--text); background: var(--surface);
  width: 100%;
}
input:focus, select:focus { outline: 2px solid var(--primary); border-color: transparent; }

/* Config */
.config-section { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.25rem; margin-bottom: 1.5rem; }
.config-section h3 { margin-bottom: 1rem; }

/* Upload result */
#upload-result { margin-top: 0.75rem; font-size: 0.85rem; }
#upload-result .ok { color: var(--green); }
#upload-result .err { color: var(--red); }

/* Messages */
.msg { padding: 0.75rem 1rem; border-radius: var(--radius); margin-bottom: 1rem; }
.hidden { display: none !important; }

/* Responsive */
@media (max-width: 600px) {
  .form-grid, .edit-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
}