* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    background: #f4f7fb;
    color: #1f2937;
}

.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 30px;
    background: linear-gradient(135deg, #0f172a, #1e293b);
}

.login-box {
    width: 100%;
    max-width: 420px;
    background: #ffffff;
    border-radius: 14px;
    padding: 32px;
    box-shadow: 0 20px 45px rgba(0, 0, 0, 0.18);
}

.login-box h1 {
    font-size: 28px;
    margin-bottom: 8px;
    color: #111827;
}

.login-box p {
    margin-bottom: 22px;
    color: #6b7280;
}

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

.form-group label {
    display: block;
    margin-bottom: 7px;
    font-size: 14px;
    font-weight: 600;
}

.form-group input {
    width: 100%;
    height: 46px;
    padding: 0 14px;
    border: 1px solid #d1d5db;
    border-radius: 10px;
    outline: none;
    font-size: 15px;
}

.form-group input:focus {
    border-color: #111827;
}

button {
    width: 100%;
    height: 48px;
    border: none;
    border-radius: 10px;
    background: #111827;
    color: #ffffff;
    font-size: 15px;
    font-weight: 700;
    cursor: pointer;
}

button:hover {
    opacity: 0.95;
}

.alert-error {
    background: #fee2e2;
    color: #991b1b;
    border: 1px solid #fecaca;
    padding: 12px 14px;
    border-radius: 10px;
    margin-bottom: 16px;
}

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

.sidebar {
    width: 250px;
    background: #0f172a;
    color: #ffffff;
    padding: 24px;
}

.sidebar h2 {
    margin-bottom: 24px;
    font-size: 24px;
}

.sidebar a {
    display: block;
    text-decoration: none;
    color: #cbd5e1;
    background: rgba(255, 255, 255, 0.04);
    padding: 12px 14px;
    border-radius: 10px;
    margin-bottom: 12px;
}

.sidebar a:hover {
    color: #ffffff;
    background: rgba(255, 255, 255, 0.08);
}

.main-content {
    flex: 1;
    padding: 30px;
}

.topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    gap: 20px;
}

.topbar h1 {
    font-size: 30px;
}

.user-info {
    background: #ffffff;
    border-radius: 12px;
    padding: 12px 16px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 20px;
}

.card {
    background: #ffffff;
    border-radius: 14px;
    padding: 24px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.06);
}

.card h3 {
    margin-bottom: 10px;
    font-size: 20px;
}

.card p {
    color: #4b5563;
    line-height: 1.6;
}