:root {
            --primary:#2a89e3;
            --secondary:#2a89e3;
            --accent: #2a89e3;
            --light: #f8f9fa;
            --dark: #212529;
            --success: #4cc9f0;
            --warning: #f72585;
            --radius: 12px;
            --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
        }
        
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
         @keyframes titlePulse {
            0% { opacity: 0.5; }
            50% { opacity: 1; }
            100% { opacity: 0.5; }
        }
        .title-changing {
            animation: titlePulse 0.5s ease-in-out;
        }
        body {
            font-family: 'Poppins', sans-serif;
            background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
            min-height: 100vh;
            color: var(--dark);
            line-height: 1.6;
        }
        
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 20px;
        }
        
        header {
            text-align: center;
            margin-bottom: 30px;
            padding: 20px 0;
        }
        
        h1 {
            font-size: 2.5rem;
            margin-bottom: 10px;
            background: linear-gradient(to right, var(--primary), var(--warning));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
        }
        
        .subtitle {
            color: #666;
            font-weight: 300;
        }
        
        .converter-container {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 30px;
            margin-bottom: 30px;
        }
        
        @media (max-width: 768px) {
            .converter-container {
                grid-template-columns: 1fr;
            }
        }
        
        .card {
            background: white;
            border-radius: var(--radius);
            padding: 25px;
            box-shadow: var(--shadow);
            transition: transform 0.3s ease;
        }
        
        .card:hover {
            transform: translateY(-5px);
        }
        
        .card-title {
            font-size: 1.2rem;
            margin-bottom: 20px;
            color: var(--primary);
            display: flex;
            align-items: center;
            gap: 10px;
        }
        
        .card-title i {
            font-size: 1.5rem;
        }
        
        .input-group {
            margin-bottom: 20px;
        }
        
        label {
            display: block;
            margin-bottom: 8px;
            font-weight: 500;
            color: #555;
        }
        
        select, input {
            width: 100%;
            padding: 12px 15px;
            border: 1px solid #ddd;
            border-radius: var(--radius);
            font-size: 1rem;
            transition: border 0.3s ease;
        }
        
        select:focus, input:focus {
            outline: none;
            border-color: var(--accent);
            box-shadow: 0 0 0 2px rgba(67, 97, 238, 0.2);
        }
        
        .btn-group {
            display: flex;
            gap: 10px;
            margin-top: 20px;
        }
        
        button {
            padding: 12px 20px;
            border: none;
            border-radius: var(--radius);
            font-size: 1rem;
            font-weight: 500;
            cursor: pointer;
            transition: all 0.3s ease;
            flex: 1;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
        }
        
        .btn-primary {
            background-color: var(--primary);
            color: white;
        }
        
        .btn-primary:hover {
            background-color: var(--secondary);
        }
        
        .btn-secondary {
            background-color: var(--light);
            color: var(--dark);
            border: 1px solid #ddd;
        }
        
        .btn-secondary:hover {
            background-color: #e9ecef;
        }
        
        .btn-warning {
            background-color: var(--warning);
            color: white;
        }
        
        .btn-warning:hover {
            background-color: #d91a6d;
        }
        
        .result-card {
            background-color: var(--primary);
            color: white;
            padding: 20px;
            border-radius: var(--radius);
            margin-top: 20px;
            text-align: center;
            font-size: 1.2rem;
            font-weight: 500;
            box-shadow: var(--shadow);
        }
        
        .ar-container {
            position: relative;
            height: 400px;
            border-radius: var(--radius);
            overflow: hidden;
            margin-top: 30px;
            background-color: #000;
        }
        
        #ar-video {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        
        .ar-overlay {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            padding: 20px;
            pointer-events: none;
        }
        
        .ar-controls {
            display: flex;
            justify-content: center;
            gap: 15px;
            pointer-events: auto;
        }
        
        .ar-btn {
            width: 50px;
            height: 50px;
            border-radius: 50%;
            background-color: rgba(255, 255, 255, 0.2);
            backdrop-filter: blur(10px);
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 1.2rem;
            cursor: pointer;
            transition: all 0.3s ease;
        }
        
        .ar-btn:hover {
            background-color: rgba(255, 255, 255, 0.3);
            transform: scale(1.1);
        }
        
        .measurement-display {
            background-color: rgba(0, 0, 0, 0.7);
            color: white;
            padding: 10px 15px;
            border-radius: var(--radius);
            margin: 0 auto;
            text-align: center;
            font-size: 1.1rem;
            backdrop-filter: blur(5px);
        }
        
        .ar-ruler {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            width: 80%;
            height: 2px;
            background-color: rgba(255, 255, 255, 0.8);
            display: none;
        }
        
        .ar-ruler::before, .ar-ruler::after {
            content: '';
            position: absolute;
            width: 20px;
            height: 20px;
            border: 2px solid white;
            border-radius: 50%;
            top: 50%;
            transform: translateY(-50%);
        }
        
        .ar-ruler::before {
            left: 0;
        }
        
        .ar-ruler::after {
            right: 0;
        }
        
        .ar-marker {
            position: absolute;
            width: 10px;
            height: 10px;
            background-color: var(--warning);
            border-radius: 50%;
            transform: translate(-50%, -50%);
            display: none;
        }
        
        .tab-container {
            display: flex;
            margin-bottom: 20px;
            border-bottom: 1px solid #ddd;
        }
        
        .tab {
            padding: 10px 20px;
            cursor: pointer;
            font-weight: 500;
            color: #666;
            border-bottom: 3px solid transparent;
            transition: all 0.3s ease;
        }
        
        .tab.active {
            color: var(--primary);
            border-bottom-color: var(--primary);
        }
        
        .tab-content {
            display: none;
        }
        
        .tab-content.active {
            display: block;
        }
        
        .unit-history {
            margin-top: 30px;
        }
        
        .history-item {
            background: white;
            border-radius: var(--radius);
            padding: 15px;
            margin-bottom: 10px;
            box-shadow: var(--shadow);
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .history-item .value {
            font-weight: 500;
        }
        
        .history-item .units {
            color: #666;
            font-size: 0.9rem;
        }
        
        .history-item .delete {
            color: var(--warning);
            cursor: pointer;
            font-size: 1.2rem;
        }
        
        /* Icons */
        .icon {
            font-size: 1.2rem;
        }
         /* Quick Access Panel Styles */
    .quick-access-panel {
        background: white;
        border-radius: var(--radius);
        padding: 20px;
        margin-bottom: 25px;
        box-shadow: var(--shadow);
    }

    .quick-access-title {
        color: var(--primary);
        margin-bottom: 15px;
        display: flex;
        align-items: center;
        gap: 10px;
        font-size: 1.2rem;
    }

    .conversion-categories {
        display: grid;
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
        gap: 15px;
    }

    .category-card {
        background: var(--light);
        border-radius: var(--radius);
        padding: 15px;
        transition: all 0.3s ease;
        cursor: pointer;
    }

    .category-card:hover {
        transform: translateY(-3px);
        box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    }

    .category-icon {
        width: 40px;
        height: 40px;
        background: var(--primary);
        color: white;
        border-radius: 50%;
        display: flex;
        align-items: center;
        justify-content: center;
        margin-bottom: 10px;
    }

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

    .conversion-links {
        display: flex;
        flex-direction: column;
        gap: 8px;
    }

    .conversion-links a {
        color: var(--secondary);
        text-decoration: none;
        padding: 5px 0;
        transition: all 0.2s ease;
        font-size: 0.9rem;
        display: flex;
        align-items: center;
        gap: 8px;
    }

    .conversion-links a::before {
        content: "→";
        color: var(--accent);
        font-weight: bold;
        transition: all 0.2s ease;
    }

    .conversion-links a:hover {
        color: var(--primary);
        transform: translateX(5px);
    }

    .conversion-links a:hover::before {
        color: var(--warning);
        transform: translateX(-3px);
    }

    .view-all-btn {
        background: var(--accent);
        color: white !important;
        padding: 8px 12px !important;
        border-radius: var(--radius);
        margin-top: 10px;
        text-align: center;
        display: flex;
        justify-content: center;
    }

    .view-all-btn:hover {
        background: var(--primary) !important;
        transform: none !important;
    }

    .view-all-btn::before {
        content: "" !important;
    }

    /* Mobile Styles */
    @media (max-width: 768px) {
        .conversion-categories {
            grid-template-columns: 1fr;
        }

        .more-categories {
            display: none;
        }
    }

    /* Animation for the panel */
    @keyframes fadeInUp {
        from {
            opacity: 0;
            transform: translateY(20px);
        }
        to {
            opacity: 1;
            transform: translateY(0);
        }
    }

    .quick-access-panel {
        animation: fadeInUp 0.5s ease-out;
    }