:root {
            --bg-primary: #0A0A0C;
            --bg-secondary: #101013;
            --bg-tertiary: #1A1A1E;
            --bg-quaternary: #232327;
            --text-primary: #EAEAEA;
            --text-secondary: #A0A0A5;
            --text-muted: #6B7280;
            --border-color: #2D2D33;
            --border-color-light: #38383D;
            --accent-color-1: #8A2BE2; /* Morado principal */
            --accent-color-2: #00D4FF; /* Azul cian */
            --accent-color-success: #2ECC71;
            --accent-color-danger: #E74C3C;
            --accent-color-warning: #F39C12;
            --font-sans: 'Inter', sans-serif;
        }

        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        
        body {
            font-family: var(--font-sans);
            background-color: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.65;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        body.modal-open { overflow: hidden; }

        .gradient-text {
            background: linear-gradient(135deg, var(--accent-color-1), var(--accent-color-2));
            -webkit-background-clip: text; -webkit-text-fill-color: transparent;
            background-clip: text; text-fill-color: transparent;
            font-weight: 700;
        }

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

        .settings-app-header {
            display: flex; justify-content: space-between; align-items: center;
            padding: 16px 24px; background-color: rgba(10, 10, 12, 0.7);
            backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
            border-bottom: 1px solid var(--border-color); position: sticky; top: 0; z-index: 1000;
        }
        .logo-link-main-header { display: flex; align-items: center; text-decoration: none; }
        .logo-icon-main-header { height: 30px; width: auto; margin-right: 8px; }
        .logo-text-main-header { font-size: 1.3rem; font-weight: 700; color: var(--text-primary); }
        .logo-text-main-header .gradient-text { font-size: 1.5rem; }
        
        .user-actions-header { display: flex; align-items: center; gap: 15px; }
        .user-profile-avatar-header {
            width: 36px; height: 36px; border-radius: 50%;
            object-fit: cover; cursor: pointer; border: 2px solid var(--border-color);
        }
         .back-to-dashboard-link {
            color: var(--text-secondary); font-size: 0.9rem; font-weight: 500;
            padding: 7px 14px; border: 1px solid var(--border-color); border-radius: 6px;
            transition: background-color 0.2s ease, color 0.2s ease; display: inline-flex; align-items: center;
        }
        .back-to-dashboard-link:hover { background-color: var(--bg-tertiary); color: var(--text-primary); }
        .back-to-dashboard-link svg { width: 16px; height: 16px; margin-right: 6px; }

        .settings-container { max-width: 1200px; width: 95%; margin: 30px auto; }
        .settings-title-bar { margin-bottom: 30px; text-align: left; }
        .settings-title-bar h1 { font-size: 2rem; font-weight: 700; color: var(--text-primary); margin-bottom: 5px; }
        .settings-title-bar p { font-size: 1rem; color: var(--text-secondary); }

        .settings-layout { display: flex; flex-direction: column; gap: 0; }

        .settings-tabs-nav {
            display: flex; margin-bottom: 25px; border-bottom: 1px solid var(--border-color);
            overflow-x: auto; -ms-overflow-style: none; scrollbar-width: none;
        }
        .settings-tabs-nav::-webkit-scrollbar { display: none; }

        .settings-tab-button {
            padding: 10px 18px; font-size: 0.9rem; font-weight: 500; color: var(--text-secondary);
            background-color: transparent; border: none; border-bottom: 3px solid transparent;
            cursor: pointer; transition: color 0.2s ease, border-color 0.2s ease;
            margin-right: 8px; white-space: nowrap; display: flex; align-items: center; gap: 7px;
        }
        .settings-tab-button svg { width: 15px; height: 15px; color: var(--text-muted); transition: color 0.2s ease;}
        .settings-tab-button:hover { color: var(--text-primary); }
        .settings-tab-button:hover svg { color: var(--accent-color-2); }
        .settings-tab-button.active {
            color: var(--text-primary); font-weight: 600;
            border-bottom-color: var(--active-tab-color, var(--accent-color-1));
        }
        .settings-tab-button.active svg { color: var(--active-tab-color, var(--accent-color-1)); }

        .settings-content-card {
            background-color: var(--bg-secondary); padding: 25px 30px; border-radius: 10px;
            border: 1px solid var(--border-color); box-shadow: 0 3px 12px rgba(0,0,0,0.1);
            display: none; animation: fadeInContentCard 0.35s ease-out forwards;
        }
        .settings-content-card.active { display: block; }
        
        @keyframes fadeInContentCard {
            from { opacity: 0; transform: translateY(3px); }
            to { opacity: 1; transform: translateY(0); }
        }

        .settings-content-card h2 {
            font-size: 1.4rem; font-weight: 600; color: var(--text-primary);
            margin-bottom: 20px; padding-bottom: 10px; border-bottom: 1px solid var(--border-color-light);
        }
        
        .form-section { margin-bottom: 25px; }
        .form-section:last-child { margin-bottom: 0; }
        .form-section h3 {
            font-size: 1.05rem; font-weight: 500; color: var(--text-primary);
            margin-bottom: 15px;
        }
        .form-grid { display: grid; grid-template-columns: 1fr; gap: 18px; }
        @media (min-width: 600px) { .form-grid { grid-template-columns: repeat(2, 1fr); } }
        
        .form-group { margin-bottom: 16px; }
        .form-group label {
            display: block; font-size: 0.85rem; color: var(--text-secondary);
            margin-bottom: 6px; font-weight: 500;
        }
        .form-group input[type="text"],
        .form-group input[type="email"],
        .form-group input[type="password"],
        .form-group select,
        .form-group textarea {
            width: 100%; padding: 9px 12px; background-color: var(--bg-tertiary);
            color: var(--text-primary); border: 1px solid var(--border-color-light);
            border-radius: 6px; font-size: 0.9rem;
            transition: border-color 0.2s ease, box-shadow 0.2s ease;
        }
        .form-group input:focus, .form-group select:focus, .form-group textarea:focus {
            outline: none; border-color: var(--accent-color-1);
            box-shadow: 0 0 0 2px rgba(138, 43, 226, 0.2);
        }
        .form-group input[disabled] { background-color: #222; color: #777; cursor: not-allowed; }
        .form-group textarea { min-height: 80px; resize: vertical; }
        .form-group small { display: block; font-size: 0.75rem; color: var(--text-muted); margin-top: 4px; }

        .button-base {
            display: inline-flex; align-items: center; gap: 8px;
            padding: 9px 18px; border-radius: 6px;
            font-weight: 500; font-size: 0.9rem; border: none;
            transition: transform 0.15s ease, box-shadow 0.2s ease, opacity 0.2s ease;
            cursor: pointer;
        }
        .button-base:hover:not(:disabled) { transform: translateY(-1px); }
        .button-base:disabled { opacity: 0.6; cursor: not-allowed; }
        .button-base svg { width: 15px; height: 15px; }

        .button-primary {
            background: linear-gradient(135deg, var(--accent-color-1), #5e2ab2); color: #ffffff;
            box-shadow: 0 3px 10px rgba(138,43,226,0.2);
        }
        .button-primary:hover:not(:disabled) { box-shadow: 0 4px 12px rgba(138,43,226,0.3); }

        .button-secondary {
            background-color: var(--bg-quaternary); color: var(--text-secondary);
            border: 1px solid var(--border-color-light);
        }
        .button-secondary:hover:not(:disabled) { background-color: #2a2a2f; color: var(--text-primary); }
        
        .button-danger {
            background-color: var(--bg-tertiary); color: var(--accent-color-danger);
            border: 1px solid var(--accent-color-danger);
        }
        .button-danger:hover:not(:disabled) { background-color: rgba(231, 76, 60, 0.1); border-color: #d63031; }


        .profile-pic-settings-area { display: flex; align-items: center; gap: 18px; margin-bottom: 20px; }
        .profile-pic-current { width: 64px; height: 64px; border-radius: 50%; object-fit: cover; border: 2px solid var(--border-color); }
        .profile-pic-upload-btn {
            background-color: var(--bg-tertiary); color: var(--text-secondary); padding: 7px 14px;
            border-radius: 6px; cursor: pointer; font-size: 0.8rem; border: 1px solid var(--border-color-light);
        }
        .profile-pic-upload-btn:hover { background-color: #252529; }
        .profile-pic-upload-btn input[type="file"] { display: none; }
        
        .preference-item { display: flex; justify-content: space-between; align-items: center; padding: 10px 0; border-bottom: 1px solid #252529; }
        .preference-item:last-child { border-bottom: none; }
        .preference-label { font-size: 0.9rem; color: var(--text-primary); }
        .preference-description { font-size: 0.78rem; color: var(--text-secondary); margin-top: 2px; }
        .toggle-switch-prefs { position: relative; display: inline-block; width: 40px; height: 22px; }
        .toggle-switch-prefs input { opacity: 0; width: 0; height: 0; }
        .slider-prefs { position: absolute; cursor: pointer; top: 0; left: 0; right: 0; bottom: 0; background-color: #333; transition: .3s; border-radius: 22px; }
        .slider-prefs:before { position: absolute; content: ""; height: 16px; width: 16px; left: 3px; bottom: 3px; background-color: white; transition: .3s; border-radius: 50%; }
        input:checked + .slider-prefs { background-color: var(--accent-color-1); }
        input:checked + .slider-prefs:before { transform: translateX(18px); }

        .session-list { list-style: none; padding: 0; }
        .session-item {
            display: flex; justify-content: space-between; align-items: center;
            padding: 12px 15px; background-color: var(--bg-tertiary);
            border-radius: 8px; margin-bottom: 10px; border: 1px solid var(--border-color-light);
        }
        .session-info { display: flex; align-items: center; gap: 12px; }
        .session-info svg { width: 22px; height: 22px; color: var(--text-secondary); }
        .session-details p { margin: 0; font-size: 0.9rem; }
        .session-details .device-info { color: var(--text-primary); }
        .session-details .location-time { font-size: 0.8rem; color: var(--text-muted); }
        .session-item .button-danger { padding: 6px 12px; font-size: 0.8rem; }
        .button-bar { margin-top: 20px; display: flex; gap: 10px; flex-wrap: wrap; }

        .settings-footer-page {
            text-align: center; padding: 30px 20px;
            border-top: 1px solid var(--border-color);
            color: var(--text-muted); font-size: 0.8rem;
            margin-top: 40px;
        }

        .form-message-placeholder {
            min-height: 20px; 
            margin-top: 15px;
            font-size: 0.85rem;
            font-weight: 500;
        }
        .form-message-placeholder.success { color: var(--accent-color-success); }
        .form-message-placeholder.error { color: var(--accent-color-danger); }
        .form-message-placeholder.info { color: var(--accent-color-2); }

        .loading-placeholder {
            color: var(--text-muted);
            font-style: italic;
            padding: 15px 0;
            text-align: center;
        }


        @media (max-width: 768px) {
            .settings-container { width: 100%; margin: 20px auto; padding:0; }
            .settings-tabs-nav { margin-left: -20px; margin-right: -20px; padding-left: 15px; padding-right: 15px; }
            .settings-content-card { padding: 20px; border-radius:0; border-left:0; border-right:0;}
            .settings-title-bar { padding: 0 15px; }
            .settings-title-bar h1 { font-size: 1.8rem; }
            .settings-content-card h2 { font-size: 1.3rem; }
        }
         @media (max-width: 600px) {
            .settings-app-header { padding: 12px 15px; }
            .logo-text-main-header { font-size: 1.1rem;}
            .logo-text-main-header .gradient-text { font-size: 1.3rem;}
            .back-to-dashboard-link { padding: 6px 10px; font-size: 0.8rem; }
            .user-profile-avatar-header { width:32px; height:32px;}
            .session-item { flex-direction: column; align-items: flex-start; gap: 8px; }
            .session-item .button-danger { align-self: flex-end; }
        }