:root[data-theme="clair"] {
    --bg: #f4f5f7;
    --surface: #ffffff;
    --text: #1c1e21;
    --text-muted: #6b7280;
    --border: #e2e4e8;
    --primary: #2563eb;
    --primary-text: #ffffff;
    --danger: #dc2626;
    --positif: #16a34a;
    --negatif: #dc2626;
    --nav-bg: #ffffff;
}

:root[data-theme="sombre"] {
    --bg: #14161a;
    --surface: #1e2126;
    --text: #e8e9ec;
    --text-muted: #9aa0aa;
    --border: #2c2f36;
    --primary: #3b82f6;
    --primary-text: #ffffff;
    --danger: #f87171;
    --positif: #4ade80;
    --negatif: #f87171;
    --nav-bg: #1a1c21;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    font-size: 16px;
    line-height: 1.5;
}

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

h1 { font-size: 1.4rem; margin: 1rem 0; }
h2 { font-size: 1.1rem; margin: 0 0 0.75rem; }

.topbar {
    background: var(--nav-bg);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 10;
}
.topbar-inner {
    max-width: 900px;
    margin: 0 auto;
    padding: 0.75rem 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.brand { font-weight: 700; font-size: 1.1rem; color: var(--text); flex: 1; }
.icon-btn {
    background: none;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 0.4rem 0.6rem;
    cursor: pointer;
    font-size: 1rem;
    color: var(--text);
}
.menu-btn { display: none; }

.mainnav {
    max-width: 900px;
    margin: 0 auto;
    padding: 0.5rem 1rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
    border-bottom: 1px solid var(--border);
}
.mainnav a { color: var(--text-muted); font-size: 0.9rem; }
.mainnav a:hover { color: var(--primary); }
.nav-spacer { flex: 1; }
.nav-user { font-size: 0.85rem; color: var(--text-muted); }
.nav-logout { color: var(--danger); }

.content {
    max-width: 900px;
    margin: 0 auto;
    padding: 1rem;
}

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1rem;
    margin-bottom: 1rem;
}
.card-list { display: flex; flex-direction: column; gap: 0.75rem; }

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

table {
    width: 100%;
    border-collapse: collapse;
}
th, td {
    text-align: left;
    padding: 0.5rem;
    border-bottom: 1px solid var(--border);
    font-size: 0.9rem;
}
.table-wrap { overflow-x: auto; }

.positif { color: var(--positif); font-weight: 600; }
.negatif { color: var(--negatif); font-weight: 600; }

.solde-banque { font-size: 1.8rem; font-weight: 700; margin: 0.5rem 0 1rem; }

label { display: block; margin: 0.75rem 0 0.25rem; font-size: 0.9rem; font-weight: 600; }
input[type=text], input[type=date], input[type=month], input[type=password], select, textarea {
    width: 100%;
    padding: 0.6rem;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: var(--bg);
    color: var(--text);
    font-size: 1rem;
}

.btn {
    display: inline-block;
    padding: 0.6rem 1rem;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 600;
    text-align: center;
}
.btn-primary { background: var(--primary); color: var(--primary-text); }
.btn-secondary { background: var(--border); color: var(--text); }
.btn-danger { background: transparent; color: var(--danger); border: 1px solid var(--danger); }
.btn-sm { padding: 0.35rem 0.6rem; font-size: 0.8rem; }
.btn-block { width: 100%; margin-top: 1rem; }

.inline-form { display: inline; }
.inline-form-block { display: flex; align-items: flex-end; gap: 0.75rem; flex-wrap: wrap; }
.inline-form-block label { margin-top: 0; }

.checkbox-group, .radio-group {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: 0.25rem;
}
.checkbox-label, .radio-label {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    font-weight: 400;
    background: var(--bg);
    border: 1px solid var(--border);
    padding: 0.4rem 0.6rem;
    border-radius: 8px;
    font-size: 0.9rem;
}

.custom-amounts { margin-top: 0.5rem; display: flex; flex-direction: column; gap: 0.5rem; }
.custom-amount-row { display: flex; align-items: center; gap: 0.5rem; }
.custom-amount-row span { width: 100px; font-size: 0.9rem; }
.hidden { display: none; }

.expense-card, .task-card { }
.expense-head { display: flex; justify-content: space-between; align-items: center; gap: 0.5rem; }
.montant { font-weight: 700; }
.shares { display: flex; flex-wrap: wrap; gap: 0.4rem; margin: 0.5rem 0; }
.chip {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 999px;
    padding: 0.2rem 0.6rem;
    font-size: 0.8rem;
}

.badge {
    padding: 0.15rem 0.5rem;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 600;
}
.badge-todo { background: #fef3c7; color: #92400e; }
.badge-doing { background: #dbeafe; color: #1e40af; }
.badge-done { background: #dcfce7; color: #166534; }

.task-actions { display: flex; justify-content: space-between; align-items: center; margin-top: 0.5rem; gap: 0.5rem; }
.task-actions select { width: auto; }

.quick-actions { display: flex; gap: 0.5rem; flex-wrap: wrap; margin-top: 1rem; }

.alert { padding: 0.6rem 0.8rem; border-radius: 8px; font-size: 0.9rem; }
.alert-error { background: #fee2e2; color: #991b1b; }
:root[data-theme="sombre"] .alert-error { background: #431a1a; color: #fca5a5; }
:root[data-theme="sombre"] .badge-todo { background: #4a3a12; color: #fcd34d; }
:root[data-theme="sombre"] .badge-doing { background: #12294a; color: #93c5fd; }
:root[data-theme="sombre"] .badge-done { background: #123a1e; color: #86efac; }

.login-body {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: var(--bg);
    margin: 0;
    position: relative;
}
.login-theme-toggle { position: absolute; top: 1rem; right: 1rem; }
.login-box {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 2rem;
    width: 100%;
    max-width: 340px;
}
.login-box h1 { text-align: center; margin-top: 0; }

@media (max-width: 640px) {
    .mainnav { display: none; }
    .mainnav.open { display: flex; flex-direction: column; align-items: flex-start; }
    .menu-btn { display: inline-block; }
    th, td { font-size: 0.8rem; padding: 0.4rem; }
}