:root {
    --primary-color: #007AFF;
    --primary-hover: #0051D5;
    --success-color: #34C759;
    --danger-color: #FF3B30;
    --text-dark: #1d1d1f;
    --text-light: #6e6e73;
    --bg-light: #f5f5f7;
    --bg-white: #ffffff;
    --border-color: #d2d2d7;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

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

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

/* Login Section */
.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.login-box {
    background: var(--bg-white);
    padding: 3rem;
    border-radius: 20px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    max-width: 400px;
    width: 100%;
    text-align: center;
}

.login-box h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

.login-box p {
    color: var(--text-light);
    margin-bottom: 2rem;
}

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

.admin-header {
    background: var(--bg-white);
    border-bottom: 1px solid var(--border-color);
    padding: 1.5rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-content h1 {
    font-size: 1.75rem;
    color: var(--text-dark);
}

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

/* Main Content */
.admin-main {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
}

/* Tabs */
.tabs {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    border-bottom: 2px solid var(--border-color);
}

.tab-btn {
    padding: 1rem 2rem;
    background: none;
    border: none;
    border-bottom: 3px solid transparent;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-light);
    transition: all 0.3s ease;
}

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

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

.tab-content {
    display: none;
}

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

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

.section-header h2 {
    font-size: 2rem;
    color: var(--text-dark);
}

/* Apps List */
.apps-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 1.5rem;
}

.app-card {
    background: var(--bg-white);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    transition: transform 0.3s ease;
}

.app-card:hover {
    transform: translateY(-4px);
}

.app-card-header {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
}

.app-card-icon {
    width: 60px;
    height: 60px;
    border-radius: 12px;
    object-fit: cover;
}

.app-card-info h3 {
    font-size: 1.25rem;
    margin-bottom: 0.25rem;
}

.app-card-info p {
    font-size: 0.875rem;
    color: var(--text-light);
}

.app-card-description {
    color: var(--text-light);
    margin-bottom: 1rem;
    line-height: 1.6;
}

.app-card-actions {
    display: flex;
    gap: 0.5rem;
}

/* Forms */
.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-dark);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    font-family: inherit;
    transition: border-color 0.3s ease;
}

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

.form-group small {
    display: block;
    margin-top: 0.25rem;
    color: var(--text-light);
    font-size: 0.875rem;
}

.section-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary-color);
    margin: 2rem 0 1rem;
}

/* Buttons */
.btn-primary,
.btn-secondary,
.btn-danger,
.btn-logout,
.btn-edit,
.btn-delete {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

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

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

.btn-secondary {
    background-color: var(--bg-light);
    color: var(--text-dark);
    border: 1px solid var(--border-color);
    text-decoration: none;
    display: inline-block;
}

.btn-secondary:hover {
    background-color: var(--border-color);
}

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

.btn-danger:hover {
    background-color: #d32f2f;
}

.btn-logout {
    background-color: var(--danger-color);
    color: white;
}

.btn-edit {
    background-color: var(--primary-color);
    color: white;
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.btn-delete {
    background-color: var(--danger-color);
    color: white;
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

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

.modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.modal-content {
    background: var(--bg-white);
    border-radius: 16px;
    width: 100%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-large {
    max-width: 900px;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h2 {
    font-size: 1.5rem;
}

.modal-close {
    background: none;
    border: none;
    font-size: 2rem;
    cursor: pointer;
    color: var(--text-light);
    line-height: 1;
}

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

.edit-form {
    padding: 1.5rem;
}

.modal-actions {
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
    margin-top: 2rem;
}

/* FAQ Manager */
.faq-list,
.manual-list {
    margin-bottom: 1rem;
}

.faq-item-admin,
.manual-item-admin {
    background: var(--bg-light);
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 1rem;
}

.faq-item-admin .form-group,
.manual-item-admin .form-group {
    margin-bottom: 0.75rem;
}

.faq-item-admin label,
.manual-item-admin label {
    font-size: 0.875rem;
}

/* Danger Zone */
.danger-zone {
    margin-top: 3rem;
    padding: 2rem;
    background-color: #fff5f5;
    border: 2px solid var(--danger-color);
    border-radius: 12px;
}

.danger-zone h3 {
    color: var(--danger-color);
    margin-bottom: 1rem;
}

/* Error Message */
.error-message {
    color: var(--danger-color);
    margin-top: 1rem;
    font-size: 0.875rem;
}

/* Reset Password Button */
.btn-reset-password {
    width: 100%;
    padding: 0.75rem;
    margin-top: 1rem;
    background: none;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-light);
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-reset-password:hover {
    background-color: var(--bg-light);
    color: var(--text-dark);
}

/* Image Preview */
.image-preview {
    margin-top: 1rem;
    display: none;
}

.image-preview.active {
    display: block;
}

.image-preview img {
    max-width: 200px;
    max-height: 200px;
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.screenshots-preview {
    margin-top: 1rem;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 1rem;
}

.screenshot-preview-item {
    position: relative;
}

.screenshot-preview-item img {
    width: 100%;
    height: 150px;
    object-fit: cover;
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.screenshot-preview-item .remove-btn {
    position: absolute;
    top: 5px;
    right: 5px;
    background-color: var(--danger-color);
    color: white;
    border: none;
    border-radius: 50%;
    width: 24px;
    height: 24px;
    cursor: pointer;
    font-size: 1rem;
    line-height: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

.screenshot-preview-item .remove-btn:hover {
    background-color: #d32f2f;
}

/* Layout Section Styling */
.layout-section {
    background: var(--bg-white);
    padding: 1.5rem;
    border-radius: 12px;
    margin-bottom: 2rem;
    border: 1px solid var(--border-color);
}

.layout-section h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.toggle-group {
    margin-bottom: 1.5rem;
}

/* Toggle Switch */
.toggle-switch {
    display: flex;
    align-items: center;
    cursor: pointer;
    user-select: none;
}

.toggle-switch input[type="checkbox"] {
    display: none;
}

.toggle-slider {
    position: relative;
    width: 50px;
    height: 26px;
    background-color: var(--border-color);
    border-radius: 13px;
    transition: background-color 0.3s ease;
    margin-right: 1rem;
    flex-shrink: 0;
}

.toggle-slider::before {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background-color: white;
    top: 3px;
    left: 3px;
    transition: transform 0.3s ease;
}

.toggle-switch input[type="checkbox"]:checked + .toggle-slider {
    background-color: var(--success-color);
}

.toggle-switch input[type="checkbox"]:checked + .toggle-slider::before {
    transform: translateX(24px);
}

.toggle-label {
    font-weight: 500;
    color: var(--text-dark);
}

/* Responsive */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 1rem;
    }

    .apps-list {
        grid-template-columns: 1fr;
    }

    .modal.active {
        padding: 1rem;
    }

    .modal-content {
        max-height: 95vh;
    }

    .tabs {
        overflow-x: auto;
    }

    .tab-btn {
        white-space: nowrap;
    }
    
    .screenshots-preview {
        grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    }
}