:root {
    --primary: #007bff;
    --secondary: #6c757d;
    --success: #28a745;
    --danger: #dc3545;
    --light: #f8f9fa;
    --dark: #343a40;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    background-color: #f4f7f6;
    color: var(--dark);
}

.hidden { display: none !important; }

/* Login Page */
.login-container {
    max-width: 400px;
    margin: 100px auto;
    padding: 2rem;
    background: white;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    text-align: center;
}

.login-container input {
    width: 100%;
    padding: 0.8rem;
    margin-bottom: 1rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    box-sizing: border-box;
}

.login-container button {
    width: 100%;
    padding: 0.8rem;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

/* Dashboard */
nav {
    background: var(--dark);
    color: white;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

nav h1 { margin: 0; font-size: 1.5rem; }

.nav-links a {
    color: white;
    text-decoration: none;
    margin-right: 1.5rem;
}

.nav-links button {
    background: var(--danger);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    cursor: pointer;
}

main { padding: 2rem; }

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1.5rem;
}

.card {
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.card h3 { margin-top: 0; }

.card-actions {
    display: flex;
    gap: 0.5rem;
    margin-top: 1rem;
}

.card-actions button {
    flex: 1;
    padding: 0.5rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

.btn-view { background: var(--primary); color: white; }
.btn-delete { background: var(--danger); color: white; }

/* Tables */
#documents-table-container {
    background: white;
    border-radius: 8px;
    overflow-x: auto;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

table {
    width: 100%;
    border-collapse: collapse;
}

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

th { background: #f9f9f9; }

/* Modals */
#modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    width: 90%;
    max-width: 500px;
}

.modal input, .modal textarea {
    width: 100%;
    padding: 0.8rem;
    margin-bottom: 1rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    box-sizing: border-box;
}

.modal textarea { height: 150px; font-family: monospace; }

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
}

.modal-actions button {
    padding: 0.5rem 1.5rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

.modal-actions button[type="submit"] { background: var(--success); color: white; }
.error { color: var(--danger); font-size: 0.9rem; }