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

:root {
    --bg: #f5f7fb;
    --bg2: #ffffff;
    --card: #ffffff;
    --border: #d1d5db;
    --accent: #1d4ed8;
    --accent-hover: #1e40af;
    --success: #166534;
    --danger: #b91c1c;
    --warning: #d97706;
    --text: #111827;
    --text-muted: #4b5563;
    --sidebar-w: 210px;
    --radius: 8px;
    --transition: 0.18s ease;
}

html, body { height: 100%; font-family: Arial, Helvetica, sans-serif; background: var(--bg); color: var(--text); font-size: 14px; }

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

/* ===== Layout ===== */
body { display: flex; }

.sidebar {
    width: var(--sidebar-w);
    min-height: 100vh;
    background: var(--bg2);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0; left: 0; bottom: 0;
    z-index: 100;
}

.sidebar-brand {
    padding: 20px;
    border-bottom: 1px solid var(--border);
}

.brand-name { font-size: 16px; font-weight: 700; color: var(--text); }

.nav-links { list-style: none; padding: 14px 0; flex: 1; }
.nav-links li { margin: 4px 10px; }

.nav-links a {
    display: block;
    padding: 10px 14px;
    border-radius: 6px;
    color: var(--text);
    font-weight: 500;
    transition: background var(--transition), color var(--transition);
}

.nav-links a:hover, .nav-links a.active {
    background: #f1f5f9;
    color: var(--accent);
}

.sidebar-footer {
    padding: 16px 20px;
    font-size: 12px;
    color: var(--text-muted);
    border-top: 1px solid var(--border);
}

.main-content {
    margin-left: var(--sidebar-w);
    flex: 1;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.top-bar {
    padding: 16px 24px;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg2);
}

.page-title { font-size: 18px; font-weight: 600; }
.top-date { font-size: 12px; color: var(--text-muted); }

.content-area { padding: 28px; flex: 1; }

/* ===== Alerts ===== */
.alert {
    padding: 12px 18px;
    border-radius: var(--radius);
    margin: 16px 28px 0;
    font-weight: 500;
    font-size: 13.5px;
}
.alert-success { background: rgba(52,211,153,0.12); color: var(--success); border: 1px solid rgba(52,211,153,0.25); }
.alert-error { background: rgba(248,113,113,0.12); color: var(--danger); border: 1px solid rgba(248,113,113,0.25); }

/* ===== Cards ===== */
.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
}

/* ===== Dashboard stats ===== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 16px;
    margin-bottom: 28px;
}

.stat-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    text-align: center;
    transition: border-color var(--transition);
}

.stat-card:hover { border-color: var(--accent); }
.stat-icon { font-size: 28px; margin-bottom: 8px; }
.stat-value { font-size: 28px; font-weight: 700; color: var(--accent); }
.stat-label { font-size: 12px; color: var(--text-muted); margin-top: 4px; }

/* ===== Tables ===== */
.table-wrapper { overflow-x: auto; }

table { width: 100%; border-collapse: collapse; }
thead th {
    padding: 11px 14px;
    text-align: left;
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border);
}

tbody tr { border-bottom: 1px solid var(--border); transition: background var(--transition); }
tbody tr:hover { background: rgba(255,255,255,0.03); }
tbody tr:last-child { border-bottom: none; }
td { padding: 12px 14px; vertical-align: middle; }

/* ===== Badges ===== */
.badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 11px;
    font-weight: 600;
}

.badge-success { background: rgba(52,211,153,0.15); color: var(--success); }
.badge-warning { background: rgba(251,191,36,0.15); color: var(--warning); }
.badge-danger  { background: rgba(248,113,113,0.15); color: var(--danger); }

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border-radius: 7px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    border: none;
    transition: opacity var(--transition), transform var(--transition);
    line-height: 1;
}

.btn:hover { opacity: 0.88; transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn-primary { background: var(--accent); color: #fff; }
.btn-success { background: var(--success); color: #0f1117; }
.btn-danger  { background: var(--danger);  color: #0f1117; }
.btn-secondary { background: var(--border); color: var(--text); }
.btn-sm { padding: 5px 10px; font-size: 12px; }

/* ===== Forms ===== */
.form-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px;
    max-width: 520px;
}

.form-group { margin-bottom: 18px; }

label {
    display: block;
    margin-bottom: 6px;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

input[type="text"], input[type="email"], input[type="number"], select, textarea {
    width: 100%;
    padding: 10px 12px;
    background: var(--bg2);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text);
    font-family: Arial, Helvetica, sans-serif;
    font-size: 14px;
    transition: border-color var(--transition);
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: none;
}

select option { background: var(--bg2); }

.field-error { color: var(--danger); font-size: 12px; margin-top: 4px; }

.form-actions {
    display: flex;
    gap: 10px;
    margin-top: 24px;
}

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

/* ===== Confirm box ===== */
.confirm-box {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px;
    max-width: 480px;
}

.confirm-box h3 { margin-bottom: 16px; }
.confirm-details { margin-bottom: 24px; }
.confirm-details p { margin: 6px 0; color: var(--text-muted); }
.confirm-details strong { color: var(--text); }