:root {
  --bg: #f5f6f8;
  --bg-elevated: #ffffff;
  --border: #e0e3e8;
  --text: #1c1f24;
  --text-muted: #5d6572;
  --accent: #3b6fe0;
  --accent-contrast: #ffffff;
  --danger: #d1453b;
  --success: #2f9e5c;
  --warning: #c68a1f;
}

[data-theme="dark"] {
  --bg: #10131a;
  --bg-elevated: #181c24;
  --border: #262b35;
  --text: #e8eaee;
  --text-muted: #97a0ad;
  --accent: #5b8def;
  --accent-contrast: #0d1017;
  --danger: #e5695f;
  --success: #4cbf7f;
  --warning: #dba53d;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

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

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
  gap: 12px;
}

.topbar .brand {
  font-weight: 700;
  font-size: 1.1rem;
}

nav.tabs {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}

nav.tabs a {
  padding: 8px 12px;
  border-radius: 6px;
  text-decoration: none;
  color: var(--text-muted);
  font-size: 0.92rem;
}

nav.tabs a.active, nav.tabs a:hover {
  background: var(--accent);
  color: var(--accent-contrast);
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--text-muted);
}

main {
  max-width: 1000px;
  margin: 0 auto;
  padding: 24px 20px 60px;
}

.card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 18px 20px;
  margin-bottom: 20px;
}

.grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}

.stat {
  text-align: center;
}

.stat .value {
  font-size: 1.8rem;
  font-weight: 700;
}

.stat .label {
  color: var(--text-muted);
  font-size: 0.85rem;
}

h1 { font-size: 1.5rem; margin-top: 0; }
h2 { font-size: 1.15rem; }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}

th, td {
  text-align: left;
  padding: 8px 10px;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}

th { color: var(--text-muted); font-weight: 600; font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.03em; }

tr:hover td { background: color-mix(in srgb, var(--accent) 6%, transparent); }

.badge {
  display: inline-block;
  padding: 3px 9px;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 600;
}

.badge-open { background: color-mix(in srgb, var(--warning) 22%, transparent); color: var(--warning); }
.badge-confirmed, .badge-done { background: color-mix(in srgb, var(--success) 22%, transparent); color: var(--success); }
.badge-declined { background: color-mix(in srgb, var(--danger) 22%, transparent); color: var(--danger); }
.badge-backlog { background: color-mix(in srgb, var(--text-muted) 25%, transparent); color: var(--text-muted); }
.badge-in_progress { background: color-mix(in srgb, var(--accent) 22%, transparent); color: var(--accent); }

form.inline { display: inline; }

input, select, textarea, button {
  font-family: inherit;
  font-size: 0.92rem;
  padding: 8px 10px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
}

textarea { width: 100%; resize: vertical; }

button, .btn {
  cursor: pointer;
  background: var(--accent);
  color: var(--accent-contrast);
  border: none;
  font-weight: 600;
  text-decoration: none;
  display: inline-block;
}

button.secondary, .btn.secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

button.danger { background: var(--danger); color: #fff; }

.form-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 10px;
  align-items: flex-end;
}

.form-row label {
  display: flex;
  flex-direction: column;
  font-size: 0.8rem;
  color: var(--text-muted);
  gap: 4px;
}

.error {
  background: color-mix(in srgb, var(--danger) 18%, transparent);
  color: var(--danger);
  padding: 10px 14px;
  border-radius: 6px;
  margin-bottom: 14px;
}

.success-msg {
  background: color-mix(in srgb, var(--success) 18%, transparent);
  color: var(--success);
  padding: 10px 14px;
  border-radius: 6px;
  margin-bottom: 14px;
}

.muted { color: var(--text-muted); font-size: 0.85rem; }

.login-wrap {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.login-card {
  width: 100%;
  max-width: 360px;
}

.login-card h1 { text-align: center; }

.theme-toggle {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 6px 10px;
  border-radius: 6px;
}

.settlement-row {
  display: flex;
  justify-content: space-between;
  padding: 6px 0;
  border-bottom: 1px dashed var(--border);
}

.balance-positive { color: var(--success); font-weight: 600; }
.balance-negative { color: var(--danger); font-weight: 600; }