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

body {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    min-height: 100vh;
    padding: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.container {
    max-width: 550px;
    width: 100%;
    margin: 0 auto;
    background: rgba(255,255,255,0.98);
    border-radius: 28px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.2);
    overflow: hidden;
}

.header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 24px 20px;
    text-align: center;
}

/* Logo di dalam header */
.header-logo {
    max-width: 80px;
    margin-bottom: 16px;
    border-radius: 20px;
    background: white;
    padding: 6px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}

.header h1 {
    color: white;
    font-size: 1.8rem;
    font-weight: 700;
    letter-spacing: -0.5px;
    margin: 0;
    text-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.header p {
    color: rgba(255,255,255,0.9);
    font-size: 0.85rem;
    margin-top: 8px;
}

.form-wrapper {
    padding: 24px 20px;
}

.form-group {
    margin-bottom: 22px;
}

label {
    display: block;
    font-weight: 600;
    color: #333;
    margin-bottom: 8px;
    font-size: 0.9rem;
}

input, textarea {
    width: 100%;
    padding: 14px 16px;
    border: 1.5px solid #e2e8f0;
    border-radius: 16px;
    font-size: 1rem;
    transition: all 0.2s ease;
    background: #fff;
    font-family: inherit;
}

input:focus, textarea:focus {
    outline: none;
    border-color: #764ba2;
    box-shadow: 0 0 0 3px rgba(118, 75, 162, 0.2);
}

.color-input-group {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

input[type="color"] {
    width: 70px;
    height: 55px;
    padding: 4px;
    border-radius: 16px;
    cursor: pointer;
    background: #fff;
}

.color-value {
    flex: 1;
    font-family: monospace;
    font-size: 0.9rem;
    background: #f1f5f9;
    border-radius: 40px;
    padding: 10px 16px;
}

.file-label {
    background: #f8fafc;
    border: 1.5px dashed #cbd5e1;
    border-radius: 16px;
    padding: 12px;
    text-align: center;
    cursor: pointer;
    transition: background 0.2s;
}

.file-label:hover {
    background: #f1f5f9;
}

input[type="file"] {
    display: none;
}

.file-name {
    font-size: 0.8rem;
    color: #475569;
    margin-top: 6px;
    word-break: break-all;
}

button, .download-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 16px 20px;
    font-size: 1.1rem;
    font-weight: 700;
    border-radius: 50px;
    cursor: pointer;
    width: 100%;
    text-align: center;
    display: inline-block;
    text-decoration: none;
    transition: transform 0.15s, box-shadow 0.2s;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

button:active, .download-btn:active {
    transform: scale(0.97);
}

.result {
    margin-top: 28px;
    padding: 20px;
    background: #f8fafc;
    border-radius: 24px;
    text-align: center;
}

.qr-preview {
    background: white;
    padding: 16px;
    border-radius: 24px;
    box-shadow: 0 8px 20px rgba(0,0,0,0.08);
    display: inline-block;
    max-width: 100%;
}

.qr-preview img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 0 auto;
}

.download-area {
    margin-top: 20px;
}

.error {
    background: #fee2e2;
    color: #b91c1c;
    padding: 14px;
    border-radius: 20px;
    margin-bottom: 20px;
    font-size: 0.9rem;
    border-left: 4px solid #b91c1c;
}

.info-text {
    font-size: 0.7rem;
    color: #64748b;
    margin-top: 6px;
}

/* Footer halaman */
.page-footer {
    text-align: center;
    font-size: 0.7rem;
    color: #6c757d;
    padding: 16px 20px 20px;
    border-top: 1px solid #e9ecef;
    background: #fefefe;
}

@media (max-width: 480px) {
    body {
        padding: 12px;
    }
    .container {
        border-radius: 24px;
    }
    .header h1 {
        font-size: 1.5rem;
    }
    .form-wrapper {
        padding: 20px 16px;
    }
    button, .download-btn {
        padding: 14px 16px;
        font-size: 1rem;
    }
    .color-input-group {
        flex-direction: row;
        align-items: center;
    }
    .header-logo {
        max-width: 65px;
    }
}