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

html, body {
    height: 100%;
    font-family: 'Inter', sans-serif;
    font-size: 15px;
    background-color: #f4f6f9;
    color: #2d3748;
}

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

.site-wrapper {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.site-header {
    background-color: #1a202c;
    color: #ffffff;
    padding: 0 2rem;
    height: 60px;
    display: flex;
    align-items: center;
    box-shadow: 0 2px 8px rgba(0,0,0,0.3);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-inner {
    display: flex;
    align-items: center;
    width: 100%;
    gap: 2rem;
}

.header-brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.2rem;
    font-weight: 700;
    color: #ffffff;
    letter-spacing: 0.5px;
}

.brand-icon {
    font-size: 1.4rem;
    color: #63b3ed;
}

.header-nav {
    display: flex;
    gap: 0.25rem;
    flex: 1;
}

.nav-link {
    color: #a0aec0;
    padding: 0.4rem 0.85rem;
    border-radius: 6px;
    font-size: 0.875rem;
    font-weight: 500;
    transition: background 0.2s, color 0.2s;
}

    .nav-link:hover {
        background-color: #2d3748;
        color: #ffffff;
    }

.header-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-left: auto;
}

.welcome-text {
    font-size: 0.85rem;
    color: #a0aec0;
}

.btn-logout {
    background-color: #e53e3e;
    color: #ffffff;
    border: none;
    padding: 0.4rem 1rem;
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s;
}

    .btn-logout:hover {
        background-color: #c53030;
        color: #ffffff;
    }

.site-main {
    flex: 1;
    padding: 2rem;
}

.site-footer {
    background-color: #1a202c;
    color: #718096;
    text-align: center;
    padding: 1rem;
    font-size: 0.8rem;
}

.page-title {
    font-size: 1.6rem;
    font-weight: 700;
    color: #1a202c;
    margin-bottom: 1.5rem;
    padding-bottom: 0.75rem;
    border-bottom: 3px solid #63b3ed;
    display: inline-block;
}

.card {
    background-color: #ffffff;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.07);
    padding: 2rem;
    margin-bottom: 1.5rem;
}

.card-title {
    font-size: 1rem;
    font-weight: 600;
    color: #4a5568;
    margin-bottom: 1.25rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.form-group {
    margin-bottom: 1.1rem;
}

    .form-group label {
        display: block;
        font-size: 0.875rem;
        font-weight: 500;
        color: #4a5568;
        margin-bottom: 0.4rem;
    }

.form-control {
    width: 100%;
    padding: 0.55rem 0.85rem;
    border: 1px solid #e2e8f0;
    border-radius: 6px;
    font-size: 0.9rem;
    font-family: 'Inter', sans-serif;
    color: #2d3748;
    background-color: #f7fafc;
    transition: border-color 0.2s, box-shadow 0.2s;
}

    .form-control:focus {
        outline: none;
        border-color: #63b3ed;
        box-shadow: 0 0 0 3px rgba(99,179,237,0.2);
        background-color: #ffffff;
    }

.btn {
    display: inline-block;
    padding: 0.55rem 1.4rem;
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: background 0.2s, transform 0.1s;
    font-family: 'Inter', sans-serif;
}

    .btn:active {
        transform: scale(0.98);
    }

.btn-primary {
    background-color: #3182ce;
    color: #ffffff;
}

    .btn-primary:hover {
        background-color: #2b6cb0;
    }

.btn-success {
    background-color: #38a169;
    color: #ffffff;
}

    .btn-success:hover {
        background-color: #2f855a;
    }

.btn-danger {
    background-color: #e53e3e;
    color: #ffffff;
}

    .btn-danger:hover {
        background-color: #c53030;
    }

.btn-secondary {
    background-color: #718096;
    color: #ffffff;
}

    .btn-secondary:hover {
        background-color: #4a5568;
    }

.table-wrapper {
    overflow-x: auto;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}

table {
    width: 100%;
    border-collapse: collapse;
    background-color: #ffffff;
    font-size: 0.9rem;
}

    table thead {
        background-color: #2d3748;
        color: #ffffff;
    }

        table thead th {
            padding: 0.85rem 1rem;
            text-align: left;
            font-weight: 600;
            font-size: 0.8rem;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }

    table tbody tr {
        border-bottom: 1px solid #edf2f7;
        transition: background 0.15s;
    }

        table tbody tr:hover {
            background-color: #ebf8ff;
        }

    table tbody td {
        padding: 0.8rem 1rem;
        color: #4a5568;
    }

.alert {
    padding: 0.85rem 1.1rem;
    border-radius: 6px;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 1rem;
}

.alert-success {
    background-color: #f0fff4;
    color: #276749;
    border: 1px solid #9ae6b4;
}

.alert-error {
    background-color: #fff5f5;
    color: #c53030;
    border: 1px solid #feb2b2;
}

.alert-info {
    background-color: #ebf8ff;
    color: #2b6cb0;
    border: 1px solid #bee3f8;
}

.validator-error {
    color: #e53e3e;
    font-size: 0.8rem;
    margin-top: 0.25rem;
    display: block;
}

.login-wrapper {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 80vh;
}

.login-card {
    background-color: #ffffff;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
    padding: 2.5rem;
    width: 100%;
    max-width: 420px;
}

.login-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: #1a202c;
    margin-bottom: 0.25rem;
}

.login-subtitle {
    font-size: 0.875rem;
    color: #718096;
    margin-bottom: 1.75rem;
}

.login-footer {
    text-align: center;
    margin-top: 1.25rem;
    font-size: 0.85rem;
    color: #718096;
}

    .login-footer a {
        color: #3182ce;
        font-weight: 500;
    }

        .login-footer a:hover {
            text-decoration: underline;
        }

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.25rem;
    margin-bottom: 1.5rem;
}

.stat-card {
    background-color: #ffffff;
    border-radius: 10px;
    padding: 1.5rem;
    box-shadow: 0 2px 8px rgba(0,0,0,0.07);
    border-left: 4px solid #63b3ed;
}

    .stat-card.green {
        border-left-color: #68d391;
    }

    .stat-card.red {
        border-left-color: #fc8181;
    }

    .stat-card.purple {
        border-left-color: #b794f4;
    }

.stat-label {
    font-size: 0.78rem;
    color: #718096;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 600;
}

.stat-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: #1a202c;
    margin-top: 0.25rem;
}

.badge {
    display: inline-block;
    padding: 0.2rem 0.65rem;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 600;
}

.badge-silver {
    background-color: #e2e8f0;
    color: #4a5568;
}

.badge-gold {
    background-color: #fefcbf;
    color: #744210;
}

.badge-platinum {
    background-color: #e9d8fd;
    color: #553c9a;
}