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

:root {
    --primary: #b7dbf2;
    --primary-dark: #8fc5e8;
    --primary-light: #d4ebf9;
    --text-dark: #2c3e50;
    --text-light: #7f8c8d;
    --white: #ffffff;
    --bg-light: #f8f9fa;
    --shadow: rgba(0, 0, 0, 0.1);
    --danger: #e74c3c;
    --success: #27ae60;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-light);
    color: var(--text-dark);
}

/* Login Page */
.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary) 100%);
}

.login-box {
    background: var(--white);
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 10px 30px var(--shadow);
    width: 100%;
    max-width: 400px;
}

.login-box h1 {
    text-align: center;
    margin-bottom: 30px;
    color: var(--primary-dark);
}

/* Admin Container */
.admin-container {
    min-height: 100vh;
}

.admin-header {
    background: var(--white);
    padding: 20px 40px;
    box-shadow: 0 2px 10px var(--shadow);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
}

.admin-header h1 {
    color: var(--primary-dark);
    font-size: 1.5rem;
}

.admin-nav {
    display: flex;
    gap: 15px;
}

/* Alerts */
.alert-success,
.alert-error {
    padding: 15px;
    margin: 20px 40px;
    border-radius: 5px;
    text-align: center;
}

.alert-success {
    background: #d4edda;
    color: var(--success);
}

.alert-error {
    background: #f8d7da;
    color: var(--danger);
}

/* Tabs */
.admin-tabs {
    background: var(--white);
    padding: 0 40px;
    display: flex;
    gap: 10px;
    border-bottom: 2px solid var(--bg-light);
    overflow-x: auto;
}

.tab-btn {
    padding: 15px 25px;
    background: none;
    border: none;
    color: var(--text-light);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    border-bottom: 3px solid transparent;
    transition: all 0.3s ease;
    white-space: nowrap;
}

.tab-btn:hover {
    color: var(--text-dark);
}

.tab-btn.active {
    color: var(--primary-dark);
    border-bottom-color: var(--primary);
}

.admin-content {
    padding: 40px;
    max-width: 1400px;
    margin: 0 auto;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.tab-content h2 {
    margin-bottom: 30px;
    color: var(--text-dark);
}

.tab-content h3 {
    margin-bottom: 20px;
    color: var(--primary-dark);
}

/* Forms */
.admin-form {
    background: var(--white);
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 2px 10px var(--shadow);
    margin-bottom: 30px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-dark);
    font-weight: 500;
}

.form-group small {
    display: block;
    color: var(--text-light);
    font-size: 0.85rem;
    margin-top: 5px;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 10px 15px;
    border: 2px solid var(--bg-light);
    border-radius: 5px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary);
}

/* Buttons */
.btn-primary,
.btn-secondary,
.btn-danger {
    padding: 12px 30px;
    border: none;
    border-radius: 5px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
}

.btn-primary {
    background: var(--primary);
    color: var(--text-dark);
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px var(--shadow);
}

.btn-secondary {
    background: var(--text-light);
    color: var(--white);
}

.btn-secondary:hover {
    background: var(--text-dark);
}

.btn-danger {
    background: var(--danger);
    color: var(--white);
    padding: 8px 20px;
    font-size: 0.9rem;
}

.btn-danger:hover {
    background: #c0392b;
}

/* Error Message */
.error-message {
    background: #f8d7da;
    color: var(--danger);
    padding: 12px;
    border-radius: 5px;
    margin-bottom: 20px;
}

/* Section Editor */
.section-editor {
    margin-bottom: 30px;
}

/* Items Lists */
.items-list,
.items-grid {
    display: grid;
    gap: 20px;
}

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

.item-card {
    background: var(--white);
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 10px var(--shadow);
}

.item-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: 5px;
    margin-bottom: 15px;
}

.item-card h4 {
    margin-bottom: 10px;
    color: var(--text-dark);
}

.item-card p {
    color: var(--text-light);
    margin-bottom: 8px;
    font-size: 0.95rem;
}

.item-badge {
    display: inline-block;
    background: var(--primary-light);
    color: var(--text-dark);
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 0.85rem;
    margin-bottom: 10px;
}

/* Messages */
.message-card {
    background: var(--white);
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 10px var(--shadow);
    margin-bottom: 15px;
    border-left: 4px solid var(--primary);
}

.message-card.read {
    opacity: 0.7;
    border-left-color: var(--text-light);
}

.message-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 10px;
    flex-wrap: wrap;
    gap: 10px;
}

.message-header strong {
    color: var(--text-dark);
}

.message-date {
    color: var(--text-light);
    font-size: 0.85rem;
}

.message-content {
    color: var(--text-dark);
    line-height: 1.6;
    margin: 10px 0;
}

.message-meta {
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 10px;
}

/* Responsive */
@media (max-width: 768px) {
    .admin-header {
        flex-direction: column;
        text-align: center;
        padding: 20px;
    }

    .admin-content {
        padding: 20px;
    }

    .admin-tabs {
        padding: 0 20px;
    }

    .items-grid {
        grid-template-columns: 1fr;
    }

    .message-header {
        flex-direction: column;
        align-items: flex-start;
    }
}

/* Modales */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    overflow-y: auto;
}

.modal-content {
    background-color: var(--white);
    margin: 50px auto;
    padding: 30px;
    border-radius: 10px;
    width: 90%;
    max-width: 600px;
    position: relative;
    box-shadow: 0 10px 40px var(--shadow);
}

.modal-close {
    position: absolute;
    right: 20px;
    top: 15px;
    font-size: 28px;
    font-weight: bold;
    color: var(--text-light);
    cursor: pointer;
    transition: color 0.3s;
}

.modal-close:hover {
    color: var(--text-dark);
}

.modal h2 {
    margin-bottom: 25px;
    color: var(--text-dark);
}