* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background: #111827;
    color: #e5e7eb;
    font-family: Arial, sans-serif;
}

.sidebar {
    position: fixed;
    width: 230px;
    height: 100vh;
    background: #0b1220;
    padding: 25px 18px;
}

.sidebar h2 {
    color: #38bdf8;
    margin-bottom: 35px;
}

.sidebar a {
    display: block;
    color: #cbd5e1;
    padding: 13px;
    text-decoration: none;
    border-radius: 7px;
    margin-bottom: 5px;
}

.sidebar a:hover {
    background: #1e293b;
    color: white;
}

main {
    margin-left: 230px;
    padding: 30px;
}

h1 {
    margin-top: 0;
}

.cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 15px;
}

.card, .form-card {
    background: #1e293b;
    border: 1px solid #334155;
    padding: 20px;
    border-radius: 10px;
    margin-bottom: 20px;
}

.card span {
    display: block;
    color: #94a3b8;
}

.card strong {
    display: block;
    font-size: 30px;
    margin-top: 12px;
    color: #38bdf8;
}

.chart-box {
    background: #1e293b;
    padding: 20px;
    height: 350px;
    margin-bottom: 25px;
    border-radius: 10px;
}

table {
    width: 100%;
    border-collapse: collapse;
    background: #1e293b;
    margin-top: 20px;
}

th, td {
    text-align: left;
    padding: 12px;
    border-bottom: 1px solid #334155;
}

th {
    color: #38bdf8;
}

input, select {
    background: #0f172a;
    color: white;
    border: 1px solid #475569;
    padding: 11px;
    border-radius: 6px;
    margin: 5px;
}

button {
    background: #0284c7;
    color: white;
    border: none;
    padding: 11px 18px;
    border-radius: 6px;
    cursor: pointer;
}

button:hover {
    background: #0369a1;
}

.danger {
    background: #dc2626;
}

.logout {
    margin-top: 25px;
    background: #475569;
    width: 100%;
}

.message {
    padding: 12px;
    margin-bottom: 15px;
    border-radius: 6px;
}

.success {
    background: #14532d;
}

.error {
    background: #7f1d1d;
}

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

.login-box {
    width: 350px;
    padding: 30px;
    background: #1e293b;
    border-radius: 12px;
}

.login-box input {
    display: block;
    width: 100%;
    margin: 12px 0;
}

.login-box button {
    width: 100%;
}

.pagination {
    padding: 20px;
}

.pagination a {
    color: #38bdf8;
    padding: 10px;
}

@media(max-width: 800px) {
    .sidebar {
        position: static;
        width: 100%;
        height: auto;
    }

    main {
        margin-left: 0;
        padding: 15px;
    }
}
.sidebar-author {
    margin-top: 20px;
    padding: 12px 0;
    font-size: 12px;
    font-weight: normal;
    color: #999;
    border-top: 1px solid #444;
}