/* ── CSS custom properties (light default) ─────────────────────────────── */
:root {
  --bg: #f8f9fa;
  --bg-card: #ffffff;
  --fg: #212529;
  --fg-muted: #6c757d;
  --border: #dee2e6;
  --primary: #0d6efd;
  --primary-hover: #0b5ed7;
  --danger: #dc3545;
  --success: #198754;
  --warning: #ffc107;
  --tab-active-bg: #ffffff;
  --tab-active-border: #0d6efd;
  --shadow: 0 1px 3px rgba(0,0,0,0.08);
}

/* ── Dark mode ──────────────────────────────────────────────────────────── */
html.dark {
  --bg: #1a1d23;
  --bg-card: #252932;
  --fg: #e9ecef;
  --fg-muted: #adb5bd;
  --border: #373b45;
  --primary: #4da3ff;
  --primary-hover: #6eb8ff;
  --tab-active-bg: #252932;
  --tab-active-border: #4da3ff;
  --shadow: 0 1px 3px rgba(0,0,0,0.3);
}

/* ── Reset & base ───────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: system-ui, -apple-system, sans-serif;
  font-size: 14px;
  line-height: 1.5;
  background: var(--bg);
  color: var(--fg);
  min-height: 100vh;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── Layout ─────────────────────────────────────────────────────────────── */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  height: 52px;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.app-header h1 {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* ── Tab nav ────────────────────────────────────────────────────────────── */
.tab-nav {
  display: flex;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  padding: 0 1.5rem;
  overflow-x: auto;
}

.tab-nav a {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.625rem 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--fg-muted);
  border-bottom: 2px solid transparent;
  white-space: nowrap;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
}

.tab-nav a:hover { color: var(--fg); text-decoration: none; }
.tab-nav a.active {
  color: var(--primary);
  border-bottom-color: var(--tab-active-border);
}

/* ── Content area ───────────────────────────────────────────────────────── */
#content {
  padding: 1.5rem;
  max-width: 1100px;
  margin: 0 auto;
}

/* ── Cards ──────────────────────────────────────────────────────────────── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.25rem 1.5rem;
  box-shadow: var(--shadow);
  margin-bottom: 1rem;
}

.card-title {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--fg-muted);
  margin-bottom: 0.5rem;
}

.card-value {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.card-sub {
  font-size: 0.8rem;
  color: var(--fg-muted);
  margin-top: 0.25rem;
}

/* ── Stat grid ──────────────────────────────────────────────────────────── */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

/* ── Table ──────────────────────────────────────────────────────────────── */
.table-wrap {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: var(--shadow);
  margin-bottom: 1rem;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--fg-muted);
  padding: 0.625rem 1rem;
  text-align: left;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}

td {
  padding: 0.625rem 1rem;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

tr:last-child td { border-bottom: none; }
tbody tr:hover { background: var(--bg); }

/* ── Badges ─────────────────────────────────────────────────────────────── */
.badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.15em 0.5em;
  border-radius: 4px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.badge-danger { background: #fee2e2; color: #991b1b; }
.badge-warning { background: #fef3c7; color: #92400e; }
.badge-success { background: #dcfce7; color: #166534; }
html.dark .badge-danger  { background: #450a0a; color: #fca5a5; }
html.dark .badge-warning { background: #451a03; color: #fcd34d; }
html.dark .badge-success { background: #052e16; color: #86efac; }

/* ── Buttons ────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.4rem 0.9rem;
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: 6px;
  border: none;
  cursor: pointer;
  transition: background 0.15s;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-hover); }
.btn-ghost {
  background: transparent;
  color: var(--fg-muted);
  border: 1px solid var(--border);
}
.btn-ghost:hover { color: var(--fg); background: var(--bg); }

/* ── Section title ──────────────────────────────────────────────────────── */
.section-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

/* ── Empty state ────────────────────────────────────────────────────────── */
.empty {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--fg-muted);
}

/* ── Amount colors ──────────────────────────────────────────────────────── */
.amt-in  { color: var(--success); }
.amt-out { color: var(--danger);  }

/* ── Upload form ────────────────────────────────────────────────────────── */
.upload-zone {
  border: 2px dashed var(--border);
  border-radius: 8px;
  padding: 2.5rem 2rem;
  text-align: center;
  background: var(--bg-card);
  margin-bottom: 1rem;
}

.upload-zone input[type="file"] { display: none; }
.upload-label { cursor: pointer; }

/* ── Login page ─────────────────────────────────────────────────────────── */
.login-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 1rem;
}

.login-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2.5rem 3rem;
  width: 100%;
  max-width: 420px;
  text-align: center;
  box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}

.login-card h2 { font-size: 1.25rem; margin-bottom: 0.5rem; }
.login-card p  { color: var(--fg-muted); font-size: 0.875rem; margin-bottom: 2rem; }

/* ── Dark toggle ────────────────────────────────────────────────────────── */
#theme-toggle {
  background: none;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.3rem 0.6rem;
  cursor: pointer;
  font-size: 1rem;
  color: var(--fg);
  line-height: 1;
}

/* ── HTMX loading indicator ─────────────────────────────────────────────── */
.htmx-indicator { opacity: 0; transition: opacity 0.2s; }
.htmx-request .htmx-indicator { opacity: 1; }

/* ── Mobile: bottom nav bar ─────────────────────────────────────────────── */
@media (max-width: 640px) {
  .tab-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    top: auto;
    border-top: 1px solid var(--border);
    border-bottom: none;
    padding: 0;
    justify-content: space-around;
    z-index: 100;
    background: var(--bg-card);
  }

  .tab-nav a {
    flex: 1;
    flex-direction: column;
    justify-content: center;
    gap: 0.15rem;
    padding: 0.4rem 0.25rem;
    font-size: 0.6rem;
    border-bottom: none;
    border-top: 2px solid transparent;
    text-align: center;
  }

  .tab-nav a.active {
    border-top-color: var(--tab-active-border);
    border-bottom-color: transparent;
  }

  #content {
    padding: 1rem;
    padding-bottom: 5rem; /* clearance for fixed bottom nav */
  }

  .stat-grid {
    grid-template-columns: 1fr 1fr;
  }

  table { font-size: 0.8rem; }
  th, td { padding: 0.4rem 0.5rem; }
}

/* ── Period filter buttons ── */
.period-btn {
  padding: 0.25rem 0.65rem;
  border-radius: 4px;
  font-size: 0.8rem;
  text-decoration: none;
  border: 1px solid transparent;
  color: var(--fg-muted);
  background: transparent;
  cursor: pointer;
  white-space: nowrap;
}
.period-btn:hover { border-color: var(--border); color: var(--fg); }
.period-btn-active { background: var(--accent) !important; color: #fff !important; border-color: var(--accent) !important; }
.period-input {
  font-size: 0.8rem;
  padding: 0.25rem 0.4rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--bg);
  color: var(--fg);
}