:root {
            --primary-color: #4285F4;
            --success-color: #34A853;
            --error-color: #EA4335;
            --warning-color: #FBBC05;
            --text-color: #202124;
            --secondary-text: #5F6368;
            --border-color: #DADCE0;
            --background-color: #FFFFFF;
            --section-background: #F8F9FA;
            --tel-color: #9966cc;
            --wa-color: #4FB6EC;
            --tg-color: #0088cc;
            --url-color: #DADCE0;
            --x-color: #000000;
            --sn-color: #005187;
            --mail-color: #DADCE0;
            --sx-color: #0000FF;
            --tb-color: #2b2b2d;
            --dark-background: #202124;
            --dark-section-background: #303134;
            --dark-text-color: #E8EAED;
            --dark-secondary-text: #A1A1A1;
            --dark-border-color: #5F6368;
            --nostr-color: #9966cc;
        }

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

        body {
            font-family: 'Roboto', sans-serif;
            color: var(--text-color);
            background-color: var(--background-color);
            line-height: 1.6;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            overflow-x: hidden;
            transition: all 0.3s ease;
        }

        body.dark-mode {
            --text-color: var(--dark-text-color);
            --secondary-text: var(--dark-secondary-text);
            --border-color: var(--dark-border-color);
            --background-color: var(--dark-background);
            --section-background: var(--dark-section-background);
        }

        body.dark-mode .contact-card:hover {
            background-color: #3C4043;
        }

        body.dark-mode .settings-menu,
        body.dark-mode .contact-details {
            background-color: var(--dark-section-background);
        }

        body.dark-mode .settings-item:hover {
            background-color: #3C4043;
        }

        body.dark-mode .contact-avatar {
            background-color: #5F6368;
        }
        
        body.dark-mode .logo h1 {
            color: #fff;
        }
        
        body.dark-mode footer a {
            color: #fff;
        }

        .container {
            max-width: 800px;
            margin: 0 auto;
            padding: 20px;
            flex: 1 0 auto;
            width: 590px;
        }

        header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 16px 0;
            border-bottom: 1px solid var(--border-color);
            margin-bottom: 24px;
            position: relative;
        }

        .logo {
            display: flex;
            align-items: center;
            font-size: 1em !important;
            font-weight: 500;
            color: var(--text-color);
        }

        .nostrlogo {
            color: white;
            background-color: var(--nostr-color);
            margin-right:13px;
            border: none;
            border-radius: 4px;
            padding: 8px 12px;      
            display: flex;
            align-items: center;
            justify-content: center;
            transition: background-color 0.3s;
        }
        
        .settings-btn {
            background: none;
            border: none;
            color: var(--secondary-text);
            cursor: pointer;
            font-size: 24px;
            padding: 8px;
            border-radius: 50%;
            transition: background-color 0.3s;
            z-index: 101;
        }

        .settings-menu {
            position: absolute;
            right: 20px;
            top: 66.6px;
            background-color: var(--background-color);
            border-radius: 8px;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
            padding: 8px 0;
            z-index: 100;
            display: none;
            width: 200px;
        }

        .settings-menu.show {
            display: block;
        }

        .settings-item {
            padding: 12px 16px;
            cursor: pointer;
            display: flex;
            align-items: center;
            transition: background-color 0.2s;
        }

        .settings-item:hover {
            background-color: var(--section-background);
        }

        .settings-item i {
            margin-right: 12px;
            color: var(--secondary-text);
        }

        .search-container {
            position: relative;
            margin-bottom: 24px;
        }

        .search-input {
            width: 100%;
            padding: 16px 140px 16px 16px;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            font-size: 16px;
            transition: all 0.3s;
            background-color: var(--background-color);
            color: var(--text-color);
        }

        .search-input:focus {
            outline: none;
            border-color: var(--primary-color);
            box-shadow: 0 0 0 2px rgba(66, 133, 244, 0.2);
        }

        .search-input.valid {
            border-color: var(--success-color);
            box-shadow: 0 0 0 2px rgba(52, 168, 83, 0.2);
        }

        .search-buttons {
            position: absolute;
            right: 8px;
            top: 50%;
            transform: translateY(-50%);
            display: flex;
            gap: 8px;
        }

        .search-btn {
            color: white;
            background-color: var(--nostr-color);
            border: none;
            border-radius: 4px;
            padding: 8px 12px;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: background-color 0.3s;
        }

        .search-btn:hover {
            filter: brightness(90%);
        }

        .search-btn i, .search-btn img {
            font-size: 20px;
            width: 20px;
            height: 20px;
        }

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

        .save-btn:hover {
            background-color: #3367D6;
        }

        .section-title {
            display: flex;
            align-items: center;
            margin: 24px 0 16px;
            padding-bottom: 8px;
            border-bottom: 1px dotted var(--border-color);
        }

        .section-title h2 {
            font-size: 18px;
            font-weight: 500;
            color: var(--secondary-text);
            margin-right: 8px;
            flex: 1;
        }

        .last-update {
            font-size: 14px;
            color: var(--secondary-text);
            margin-right: 8px;
        }

        .refresh-btn {
            background: none;
            border: none;
            color: var(--secondary-text);
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 4px;
            border-radius: 50%;
            transition: background-color 0.3s;
        }

        .refresh-btn:hover {
            background-color: rgba(0, 0, 0, 0.05);
        }

        .contacts-list {
            margin-bottom: 40px;
            overflow-y: auto;
        }

        .letter-section {
            margin-bottom: 16px;
        }

        .letter-heading {
            font-size: 16px;
            font-weight: 500;
            color: var(--secondary-text);
            margin-bottom: 8px;
            padding-bottom: 4px;
            border-bottom: 1px solid var(--border-color);
        }

        .contact-card {
            display: flex;
            align-items: center;
            padding: 10px 13px;
            border-radius: 8px;
            margin-bottom: 8px;
            background-color: var(--section-background);
            cursor: pointer;
            transition: background-color 0.3s;
        }

        .contact-card:hover {
            background-color: #E8F0FE;
        }

        .contact-avatar {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            object-fit: cover;
            margin-right: 12px;
            background-color: #E0E0E0;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--secondary-text);
            font-weight: 500;
        }

        .contact-avatar img {
            width: 100%;
            height: 100%;
            border-radius: 50%;
            object-fit: cover;
        }

        .contact-info {
            flex: 1;
            min-width: 0;
        }

        .contact-name {
            font-weight: 500;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        .contact-actions {
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .action-btn {
            background: none;
            border: none;
            color: var(--secondary-text);
            cursor: pointer;
            padding: 6px;
            border-radius: 50%;
            transition: background-color 0.3s;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .action-btn:hover {
            background-color: rgba(0, 0, 0, 0.05);
        }

        .call-btn {
            border-radius: 4px;
            color: white;
        }

        .call-btn:hover {
            filter: brightness(90%);
        }

        .dropdown-btn {
            transform: rotate(0deg);
            transition: transform 0.3s;
        }

        .dropdown-btn.rotated {
            transform: rotate(180deg);
        }

        .action-btn.dropdown-btn.rotated img {
            filter: hue-rotate(120deg) saturate(1.5);
        }

        .contact-details {
            padding: 12px 16px;
            background-color: var(--background-color);
            border-radius: 0 0 8px 8px;
            margin-top: -12px;
            margin-bottom: 8px;
            display: none;
            border-top: none;
        }

        .contact-details.show {
            display: block;
        }

        .contact-details.show .detail-icon img {
            filter: grayscale(100%) brightness(85%);
        }

        .crypto-icon {
            filter: grayscale(100%) brightness(85%);
        }

        .detail-item {
            display: flex;
            align-items: center;
            padding: 16px 0;
            border-bottom: 1px solid var(--border-color);
        }

        .detail-item:last-child {
            border-bottom: none;
        }

        .detail-icon {
            width: 24px;
            height: 24px;
            margin-right: 12px;
            color: var(--secondary-text);
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
        }

        .detail-content {
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        .detail-label {
            font-size: 14px;
            color: var(--secondary-text);
            cursor: pointer;
            word-break: break-word;
            overflow-wrap: break-word;
        }

        .detail-actions {
            display: flex;
            gap: 8px;
            margin-top: 4px;
        }

        .detail-action-btn {
            background: none;
            border: none;
            color: var(--primary-color);
            cursor: pointer;
            font-size: 12px;
            padding: 2px 6px;
            border-radius: 4px;
            background-color: rgba(66, 133, 244, 0.1);
            display: flex;
            align-items: center;
            gap: 4px;
        }

        .detail-action-btn:hover {
            background-color: rgba(66, 133, 244, 0.2);
        }

        .crypto-row {
            display: flex;
            gap: 12px;
            padding-top: 12px;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
        }

        .crypto-icons {
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
            align-items: center;
        }

        .crypto-icon {
            width: 30px;
            height: 30px;
            border-radius: 50%;
            object-fit: cover;
            cursor: pointer;
            transition: transform 0.2s;
        }

        .crypto-icon:hover {
            transform: scale(1.1);
        }

        .remove-contact-btn {
            background: none;
            border: 1px solid var(--error-color);
            color: var(--error-color);
            cursor: pointer;
            font-size: 12px;
            padding: 4px 8px;
            border-radius: 12px;
            transition: background-color 0.2s;
        }

        .remove-contact-btn:hover {
            background-color: rgba(234, 67, 53, 0.1);
        }

        .empty-state {
            text-align: center;
            padding: 40px 0;
            color: var(--secondary-text);
        }

        .empty-state i {
            font-size: 48px;
            margin-bottom: 16px;
            color: var(--border-color);
        }

        footer {
            text-align: center;
            padding: 20px 0;
            border-top: 1px solid var(--border-color);
            color: var(--secondary-text);
            font-size: 14px;
            flex-shrink: 0;
        }

        footer a {
            color: var(--nostr-color);
            text-decoration: none;
            margin: 0;
        }

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


        @media (max-width: 600px) {
            .container {
                padding: 16px;
                width: 100%;
            }

            .search-input {
                padding-right: 120px;
            }

            .search-buttons {
                gap: 4px;
            }

            .search-btn {
                padding: 6px 8px;
            }

            .contact-card {
                padding: 7px 9px;
            }

            .contact-avatar {
                width: 36px;
                height: 36px;
                margin-right: 10px;
            }

            .settings-menu {
                width: 180px;
                right: 16px;
            }

            .detail-item {
                display: flex;
                align-items: center;
                padding: 16px 0;
            }

            .detail-content {
                width: 100%;
            }

            .crypto-row {
                flex-direction: column;
                align-items: flex-start;
            }

            .remove-contact-btn {
                align-self: flex-end;
            }
        }