:root {
  --bg: #0a0f1e;
  --bg-alt: #0b0f1a;
  --surface: #141d2e;
  --surface-2: #1e2d45;
  --border: #263349;
  --text: #e2e8f0;
  --text-muted: #94a3b8;
  --text-faint: #64748b;
  --accent: #00cfef;
  --accent-2: #00b4d8;
  --danger: #ef4444;
  --danger-bg: #3a1418;
  --success: #4ade80;
  --success-bg: #12261c;
  --radius: 10px;
  --font: -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background: linear-gradient(180deg, var(--bg) 0%, var(--bg-alt) 100%);
  color: var(--text);
  font-family: var(--font);
  display: flex;
  flex-direction: column;
}

a { color: var(--accent); }

.topbar {
  border-bottom: 1px solid var(--border);
  background: rgba(10, 15, 30, 0.85);
  position: sticky;
  top: 0;
  z-index: 10;
}
.topbar-inner {
  max-width: 960px;
  margin: 0 auto;
  padding: 16px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand {
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-size: 1.05rem;
}
.brand-accent { color: var(--accent); }
.topnav { display: flex; align-items: center; gap: 14px; }
.topnav-user { color: var(--text-muted); font-size: 0.9rem; }

.page {
  flex: 1;
  max-width: 960px;
  width: 100%;
  margin: 0 auto;
  padding: 28px 20px 60px;
}

.footer {
  text-align: center;
  color: var(--text-faint);
  font-size: 0.8rem;
  padding: 20px;
  border-top: 1px solid var(--border);
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 20px;
}
.card-title {
  margin: 0 0 16px;
  font-size: 1rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.btn {
  display: inline-block;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 9px 16px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  background: var(--surface-2);
  color: var(--text);
}
.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #06131c;
}
.btn-primary:hover { background: var(--accent-2); }
.btn-ghost { background: transparent; color: var(--text-muted); }
.btn-ghost:hover { color: var(--text); }
.btn-danger { background: var(--danger); border-color: var(--danger); color: #fff; }

.flash-stack { margin-bottom: 20px; display: flex; flex-direction: column; gap: 8px; }
.flash {
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 0.9rem;
  border: 1px solid var(--border);
}
.flash-success { background: var(--success-bg); color: var(--success); border-color: #1e4a34; }
.flash-error { background: var(--danger-bg); color: #fca5a5; border-color: #5c1f24; }

.login-wrap {
  display: flex;
  justify-content: center;
  padding-top: 40px;
}
.login-card { width: 100%; max-width: 360px; }
.login-title { margin: 0 0 18px; font-size: 1.2rem; text-transform: uppercase; letter-spacing: 0.04em; }
.login-btn { width: 100%; margin-top: 10px; }

.field-label {
  display: block;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin: 12px 0 6px;
}
.field {
  width: 100%;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
  color: var(--text);
  font-size: 0.95rem;
  font-family: inherit;
}
.field:focus { outline: none; border-color: var(--accent); }

.month-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}
.month-label { font-weight: 700; letter-spacing: 0.03em; font-size: 1.1rem; }

.summary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
  margin-bottom: 20px;
}
.summary-card { display: flex; flex-direction: column; gap: 6px; }
.summary-label { color: var(--text-muted); font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.03em; }
.summary-value { font-size: 1.7rem; font-weight: 700; color: var(--accent); }
.summary-value-small { font-size: 1.1rem; color: var(--text); }

.category-bars { display: flex; flex-direction: column; gap: 12px; }
.category-row { display: grid; grid-template-columns: 160px 1fr 90px; align-items: center; gap: 12px; }
.category-name { font-size: 0.9rem; color: var(--text-muted); }
.category-bar-track { background: var(--bg-alt); border-radius: 6px; height: 8px; overflow: hidden; }
.category-bar-fill { background: var(--accent); height: 100%; border-radius: 6px; }
.category-amount { text-align: right; font-variant-numeric: tabular-nums; }

.add-summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--accent);
  list-style: none;
}
.add-summary::-webkit-details-marker { display: none; }
.add-form { margin-top: 16px; }
.form-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px; }

.expense-table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
.expense-table th, .expense-table td {
  text-align: left;
  padding: 10px 8px;
  border-bottom: 1px solid var(--border);
}
.expense-table th { color: var(--text-muted); font-weight: 600; font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.03em; }
.expense-table .num { text-align: right; font-variant-numeric: tabular-nums; }
.row-actions { display: flex; gap: 10px; white-space: nowrap; }
.row-actions details { position: relative; }
.row-actions .edit-form, .row-actions .delete-confirm {
  position: absolute;
  right: 0;
  top: 100%;
  z-index: 5;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px;
  width: 320px;
  max-width: 80vw;
}
.delete-confirm { display: flex; flex-direction: column; gap: 10px; width: 220px; }
.link-btn { cursor: pointer; color: var(--text-muted); font-size: 0.85rem; list-style: none; }
.link-btn::-webkit-details-marker { display: none; }
.link-btn-danger { color: #fca5a5; }

.empty-hint { color: var(--text-muted); font-size: 0.9rem; }

@media (max-width: 640px) {
  .category-row { grid-template-columns: 100px 1fr 70px; }
  .row-actions .edit-form, .row-actions .delete-confirm { right: auto; left: 0; }
}