:root {
    --bg: #f4f6fb;
    --surface: #ffffff;
    --border: #e3e7ef;
    --text: #1f2430;
    --text-muted: #7a8296;
    --primary: #4f6df5;
    --primary-dark: #3c56d6;
    --success: #21a366;
    --success-bg: #e6f7ee;
    --danger: #e0455a;
    --danger-bg: #fbe8ea;
    --warning: #e8a13a;
    --warning-bg: #fdf1de;
    --muted-bg: #eef0f5;
    --sidebar-bg: #1b2036;
    --sidebar-text: #b7bdd6;
    --sidebar-active: #2b3358;
    --radius: 10px;
}

* {
    box-sizing: border-box;
}

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

a {
    color: inherit;
    text-decoration: none;
}

/* ---------- Layout ---------- */

.layout {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 240px;
    flex-shrink: 0;
    background: var(--sidebar-bg);
    color: var(--sidebar-text);
    display: flex;
    flex-direction: column;
    padding: 20px 0;
}

.sidebar .brand {
    font-size: 18px;
    font-weight: 700;
    color: #fff;
    padding: 0 20px 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    margin-bottom: 12px;
}

.sidebar nav {
    display: flex;
    flex-direction: column;
    gap: 2px;
    flex: 1;
}

.sidebar nav a {
    padding: 11px 20px;
    font-size: 14.5px;
    border-left: 3px solid transparent;
}

.sidebar nav a:hover {
    background: rgba(255, 255, 255, 0.05);
    color: #fff;
}

.sidebar nav a.active {
    background: var(--sidebar-active);
    color: #fff;
    border-left-color: var(--primary);
    font-weight: 600;
}

.sidebar .logout {
    padding: 11px 20px;
    font-size: 14px;
    color: var(--sidebar-text);
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    margin-top: 12px;
    padding-top: 16px;
}

.sidebar .logout:hover {
    color: #fff;
}

.content {
    flex: 1;
    padding: 32px 36px;
    max-width: 1200px;
}

h1 {
    font-size: 22px;
    margin: 0 0 20px;
}

h2 {
    font-size: 17px;
    margin: 32px 0 14px;
}

.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
}

.page-header h1 {
    margin: 0;
}

.muted {
    color: var(--text-muted);
}

/* ---------- Flash messages ---------- */

.flash {
    padding: 12px 16px;
    border-radius: var(--radius);
    margin-bottom: 20px;
    font-size: 14px;
    font-weight: 500;
}

.flash-success {
    background: var(--success-bg);
    color: var(--success);
}

.flash-error {
    background: var(--danger-bg);
    color: var(--danger);
}

/* ---------- Cards (dashboard) ---------- */

.cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
    gap: 16px;
    margin-bottom: 10px;
}

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 18px 20px;
}

.card-value {
    font-size: 24px;
    font-weight: 700;
}

.card-label {
    color: var(--text-muted);
    font-size: 13px;
    margin-top: 4px;
}

/* ---------- Table ---------- */

.table {
    width: 100%;
    border-collapse: collapse;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    font-size: 14px;
}

.table th,
.table td {
    padding: 12px 14px;
    text-align: left;
    border-bottom: 1px solid var(--border);
    vertical-align: middle;
}

.table th {
    background: var(--muted-bg);
    font-weight: 600;
    font-size: 12.5px;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    color: var(--text-muted);
}

.table tr:last-child td {
    border-bottom: none;
}

.table .actions {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

.thumb {
    width: 42px;
    height: 42px;
    object-fit: cover;
    border-radius: 6px;
    display: block;
}

.thumb-lg {
    width: 160px;
    height: 160px;
    object-fit: cover;
    border-radius: var(--radius);
    margin-bottom: 8px;
}

/* ---------- Badges ---------- */

.badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 600;
}

.badge-success {
    background: var(--success-bg);
    color: var(--success);
}

.badge-muted {
    background: var(--muted-bg);
    color: var(--text-muted);
}

.badge-warning {
    background: var(--warning-bg);
    color: var(--warning);
}

/* ---------- Buttons ---------- */

.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 9px 16px;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text);
    font-size: 13.5px;
    font-weight: 600;
    cursor: pointer;
}

.btn:hover {
    background: var(--muted-bg);
}

.btn-sm {
    padding: 6px 11px;
    font-size: 12.5px;
}

.btn-primary {
    background: var(--primary);
    border-color: var(--primary);
    color: #fff;
}

.btn-primary:hover {
    background: var(--primary-dark);
}

.btn-success {
    background: var(--success);
    border-color: var(--success);
    color: #fff;
}

.btn-success:hover {
    opacity: 0.9;
}

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

.btn-danger:hover {
    opacity: 0.9;
}

/* ---------- Forms ---------- */

.form {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    max-width: 520px;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.form label {
    font-size: 13px;
    font-weight: 600;
    margin-top: 12px;
    margin-bottom: 4px;
    color: var(--text-muted);
}

.form input[type="text"],
.form input[type="number"],
.form input[type="password"],
.form input[type="file"],
.form textarea {
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 14px;
    font-family: inherit;
    width: 100%;
}

.form textarea {
    resize: vertical;
}

.form-actions {
    margin-top: 20px;
    display: flex;
    gap: 10px;
}

.form-inline {
    flex-direction: row;
    align-items: center;
    flex-wrap: wrap;
    max-width: none;
    padding: 16px 20px;
    margin-bottom: 20px;
    gap: 10px;
}

.form-inline input {
    padding: 9px 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 14px;
}

/* ---------- Tabs ---------- */

.tabs {
    display: flex;
    gap: 4px;
    margin-bottom: 18px;
    border-bottom: 1px solid var(--border);
}

.tabs a {
    padding: 10px 16px;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-muted);
    border-bottom: 2px solid transparent;
}

.tabs a.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

/* ---------- Login page ---------- */

.login-body {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: var(--sidebar-bg);
}

.login-box {
    background: var(--surface);
    border-radius: 14px;
    padding: 36px 34px;
    width: 100%;
    max-width: 340px;
}

.login-box h1 {
    font-size: 19px;
    text-align: center;
    margin-bottom: 20px;
}

.login-box form {
    display: flex;
    flex-direction: column;
}

.login-box label {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-muted);
    margin-top: 14px;
    margin-bottom: 5px;
}

.login-box input {
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 14px;
}

.login-box button {
    margin-top: 22px;
    padding: 11px;
    border: none;
    border-radius: 8px;
    background: var(--primary);
    color: #fff;
    font-size: 14.5px;
    font-weight: 600;
    cursor: pointer;
}

.login-box button:hover {
    background: var(--primary-dark);
}

@media (max-width: 720px) {
    .layout {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        flex-direction: row;
        overflow-x: auto;
        padding: 10px 0;
    }

    .sidebar .brand,
    .sidebar .logout {
        display: none;
    }

    .sidebar nav {
        flex-direction: row;
    }

    .content {
        padding: 20px;
    }
}