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

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            padding: 20px;
        }

        .card-container {
            width: 400px;
            height: 240px;
            position: relative;
            perspective: 1000px;
            transform: translateZ(0);
            -webkit-transform: translateZ(0);
        }

        .business-card {
            width: 100%;
            height: 100%;
            position: relative;
            transform-style: preserve-3d;
            -webkit-transform-style: preserve-3d;
            transition: transform 0.8s cubic-bezier(0.175, 0.885, 0.32, 1.275);
            cursor: pointer;
            transform: rotateY(0deg);
            -webkit-transform: rotateY(0deg);
        }

        .business-card.flipped {
            transform: rotateY(180deg);
            -webkit-transform: rotateY(180deg);
        }

        .card-face {
            position: absolute;
            width: 100%;
            height: 100%;
            border-radius: 20px;
            backface-visibility: hidden;
            -webkit-backface-visibility: hidden;
            box-shadow: 0 20px 40px rgba(0,0,0,0.3);
            overflow: hidden;
            z-index: 1;
        }

        /* SISI DEPAN - IDENTITAS */
        .card-back {
            background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
            color: white;
            transform: rotateY(180deg);
            -webkit-transform: rotateY(180deg);
            z-index: 2;
        }

        .back-content {
            position: relative;
            z-index: 2;
            padding: 30px;
            height: 100%;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        .header {
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        .company-name {
            font-size: 24px;
            font-weight: bold;
            background: linear-gradient(45deg, #00f5ff, #00ff88);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            text-shadow: 0 0 20px rgba(0,255,136,0.3);
        }

        .tagline {
            font-size: 12px;
            color: #a0c4ff;
            margin-top: 3px;
            font-weight: 300;
            letter-spacing: 1px;
        }

        .code-icon {
            display: flex;
            justify-content: center;
            align-items: center;
            height: 50px; /* sesuaikan tinggi area logo */
            animation: float 3s ease-in-out infinite;
        }

        .floating-logo {
            height: 40px; /* ubah sesuai ukuran yang diinginkan */
            opacity: 0.8;
        }


        @keyframes float {
            0%, 100% { transform: translateY(0px); }
            50% { transform: translateY(-8px); }
        }

        .contact-section {
            display: flex;
            flex-direction: column;
            gap: 0px;
        }

        .contact-item {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 11px;
            opacity: 0.9;
            transition: all 0.3s ease;
            text-decoration: none;
            color: inherit;
            margin-top: 4px;
            margin-bottom: 1px;
        }

        .contact-item:hover {
            transform: translateX(5px);
            color: #00ff88;
        }

        .contact-icon {
            width: 14px;
            height: 14px;
            opacity: 0.7;
        }

        /* SISI BELAKANG - LOGO */
        .card-front {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            transform: rotateY(0deg);
            -webkit-transform: rotateY(0deg);
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            padding: 20px, 0 ;
            z-index: 2;
        }

        .front-content {
            text-align: center;
            position: relative;
            z-index: 2;
        }

        .logo-image {
            width: 105px;
            height: auto;
            animation: logoGlow 2s ease-in-out infinite alternate;
            filter: drop-shadow(0 0 10px rgba(0, 255, 136, 0.4));
            margin-bottom: 13px;
        }

        .main-logo {
            display: flex;
            justify-content: center;
            margin-bottom: 0px; /* atau 0 jika ingin nempel */
        }

        @keyframes gradientMove {
            0%, 100% { background-position: 0% 50%; }
            50% { background-position: 100% 50%; }
        }

        @keyframes logoGlow {
            from { 
                text-shadow: 0 0 40px rgba(0,255,136,0.4);
                transform: scale(1);
            }
            to { 
                text-shadow: 0 0 60px rgba(0,255,136,0.8), 0 0 80px rgba(0,245,255,0.4);
                transform: scale(1.02);
            }
        }

        .logo-tagline {
            font-size: 16px;
            color: #e0e6ff;
            font-weight: 300;
            letter-spacing: 2px;
            margin-bottom: 15px;
        }

        .specialties {
            font-size: 12px;
            color: #b8c6ff;
            line-height: 1.6;
        }

        .specialty-item {
            display: inline-block;
            background: rgba(255,255,255,0.1);
            padding: 4px 12px;
            border-radius: 20px;
            margin: 3px;
            backdrop-filter: blur(10px);
            border: 1px solid rgba(255,255,255,0.1);
            margin-left: -1px;
        }

        /* ELEMEN DEKORATIF */
        .decorative-elements {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            z-index: 1;
            overflow: hidden;
        }

        .circle {
            position: absolute;
            border-radius: 50%;
            background: linear-gradient(45deg, rgba(255,255,255,0.1), rgba(0,255,136,0.2));
            animation: pulse 4s ease-in-out infinite;
        }

        .circle1 {
            width: 100px;
            height: 100px;
            top: -50px;
            right: -50px;
            animation-delay: 0s;
        }

        .circle2 {
            width: 60px;
            height: 60px;
            bottom: 20px;
            left: -30px;
            animation-delay: 2s;
        }

        .circle3 {
            width: 40px;    
            height: 40px;
            top: 50%;
            right: 20px;
            animation-delay: 1s;
        }

        @keyframes pulse {
            0%, 100% { 
                transform: scale(1);
                opacity: 0.3;
            }
            50% { 
                transform: scale(1.2);
                opacity: 0.6;
            }
        }

        .tech-pattern {
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 60px; /* ubah tinggi sesuai besar logo */
            background: url('logo2.png'); /* ganti ke path logo kamu */
            background-repeat: repeat-x;
            background-size: auto 40px; /* logo akan diskalakan tinggi 40px */
            opacity: 0.2;
        }

        .shine {
            position: absolute;
            top: -50%;
            left: -50%;
            width: 200%;
            height: 200%;
            background: linear-gradient(45deg, transparent, rgba(255,255,255,0.1), transparent);
            transform: rotate(45deg);
            animation: shine 4s ease-in-out infinite;
        }

        @keyframes shine {
            0% { transform: translateX(-100%) translateY(-100%) rotate(45deg); }
            50% { transform: translateX(100%) translateY(100%) rotate(45deg); }
            100% { transform: translateX(-100%) translateY(-100%) rotate(45deg); }
        }

        /* HOVER INSTRUCTION */
        .flip-instruction {
            position: absolute;
            bottom: -40px;
            left: 50%;
            transform: translateX(-50%);
            font-size: 12px;
            color: rgba(255,255,255,0.7);
            text-align: center;
            animation: fadeInOut 2s ease-in-out infinite;
        }

        @keyframes fadeInOut {
            0%, 100% { opacity: 0.5; }
            50% { opacity: 1; }
        }

        /* RESPONSIVE */
        @media (max-width: 320px) {
            .card-container {
                width: 100px    ;
                height: auto;
                max-width: auto;    /* Batas maksimal lebar */
            }
            
            .back-content {
                padding: 16px;
            }
            
            .company-name {
                font-size: 16px;
            }
            
            .main-logo {
                font-size: 36px;
            }
            
            .contact-item {
                font-size: 10px;
                line-height: 1.3;
            }
        }