:root {
    --primary-color: #4361ee;
    --secondary-color: #f72585;
    --accent-color: #7209b7;
    --light-color: #f8f9fa;
    --dark-color: #212529;
    --success-color: #4CAF50;
    --warning-color: #ff9100;
    --error-color: #f44336;
    --gradient-start: #4361ee;
    --gradient-end: #7209b7;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --border-radius: 8px;
    --thumb-border-radius: 20px;
    --transition-speed: 0.3s;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    background: linear-gradient(135deg, #f5f7fa 0%, #e4e9f2 100%);
    color: var(--dark-color);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: 0 10px 30px var(--shadow-color);
    padding: 30px;
    position: relative;
    overflow: hidden;
}

h1 {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 30px;
    color: var(--primary-color);
    border-bottom: 2px solid #e4e9f2;
    padding-bottom: 15px;
}

.tabs-container {
    overflow-x: auto;
    margin-bottom: 30px;
    scrollbar-width: thin;
    scrollbar-color: var(--primary-color) #f1f3f9;
}

.tabs-container::-webkit-scrollbar {
    height: 8px;
}

.tabs-container::-webkit-scrollbar-thumb {
    background-color: var(--primary-color);
    border-radius: var(--border-radius);
}

.tabs-container::-webkit-scrollbar-track {
    background-color: #f1f3f9;
}

.tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
    margin-bottom: 20px;
    min-width: max-content;
}

.tab {
    padding: 12px 20px;
    cursor: pointer;
    background-color: #f1f3f9;
    border-radius: var(--border-radius);
    transition: all var(--transition-speed);
    color: var(--dark-color);
    font-weight: 500;
    text-align: center;
    flex-grow: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.tab i {
    font-size: 16px;
}

.tab:hover {
    background-color: #e1e5f0;
    transform: translateY(-2px);
}

.tab.active {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    color: white;
    box-shadow: 0 4px 10px rgba(66, 97, 238, 0.3);
}

.tab-content {
    display: none;
    animation: fadeIn 0.5s ease;
    background-color: #f8f9fc;
    padding: 25px;
    border-radius: var(--border-radius);
    margin-bottom: 25px;
}

.tab-content.active {
    display: block;
}

.input-group {
    margin-bottom: 20px;
}

.input-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--dark-color);
}

.input-with-icon {
    position: relative;
    display: flex;
    align-items: center;
}

.input-with-icon i {
    position: absolute;
    left: 12px;
    color: #6c757d;
    font-size: 18px;
}

.input-with-icon input, 
.input-with-icon textarea {
    padding-left: 40px !important;
}

input, textarea, select {
    width: 100%;
    padding: 12px 15px;
    font-size: 16px;
    border: 2px solid #e1e5f0;
    border-radius: var(--border-radius);
    background-color: white;
    transition: border-color var(--transition-speed), box-shadow var(--transition-speed);
    font-family: inherit;
}

input:focus, textarea:focus, select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.2);
}

.checkbox-group {
    display: flex;
    align-items: center;
}

.checkbox-group input[type="checkbox"] {
    width: auto;
    margin-right: 10px;
}

.helper-text {
    font-size: 0.85rem;
    color: #6c757d;
    margin-top: 5px;
}

.file-drop-area {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 30px;
    border: 2px dashed #c5cee0;
    border-radius: var(--border-radius);
    background-color: #f8f9fc;
    transition: all var(--transition-speed);
    cursor: pointer;
    text-align: center;
}

.file-drop-area.is-active {
    border-color: var(--primary-color);
    background-color: rgba(67, 97, 238, 0.05);
}

.upload-icon {
    font-size: 48px;
    color: #adb5bd;
    margin-bottom: 15px;
}

.fake-btn {
    background-color: var(--primary-color);
    color: white;
    padding: 8px 15px;
    border-radius: 4px;
    margin-bottom: 10px;
    font-weight: 500;
    transition: background-color var(--transition-speed);
}

.fake-btn:hover {
    background-color: var(--accent-color);
}

.file-msg {
    color: #6c757d;
    font-size: 0.9rem;
}

.file-input {
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 100%;
    opacity: 0;
    cursor: pointer;
}

.file-preview {
    margin-top: 20px;
}

.file-preview img, 
.file-preview video {
    max-width: 100%;
    max-height: 300px;
    border-radius: var(--border-radius);
    border: 1px solid #e1e5f0;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.05);
}

.option-row {
    display: flex;
    gap: 20px;
    margin-bottom: 25px;
}

.option-group {
    flex: 1;
}

.action-btn {
    display: block;
    width: 100%;
    padding: 15px;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    color: white;
    border: none;
    border-radius: var(--border-radius);
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-speed);
    margin-bottom: 25px;
    box-shadow: 0 4px 10px rgba(66, 97, 238, 0.3);
}

.action-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(66, 97, 238, 0.4);
}

.action-btn i {
    margin-right: 8px;
}

.qr-output {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-top: 30px;
}

#qrcode {
    background-color: white;
    padding: 20px;
    border-radius: var(--border-radius);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    margin-bottom: 20px;
}

#qrcode canvas {
    display: block;
}

.error {
    color: var(--error-color);
    margin-bottom: 15px;
    text-align: center;
    font-weight: 500;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    padding: 12px 25px;
    background-color: var(--success-color);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-speed);
    margin-top: 15px;
    box-shadow: 0 4px 10px rgba(76, 175, 80, 0.3);
}

.download-btn:hover {
    background-color: #3d8b40;
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(76, 175, 80, 0.4);
}

.download-btn i {
    margin-right: 8px;
}

footer {
    text-align: center;
    margin-top: 30px;
    color: #6c757d;
    font-size: 0.9rem;
}

footer i {
    color: var(--secondary-color);
}

.note {
    background-color: #e7f3ff;
    color: #0056b3;
    padding: 10px 15px;
    border-radius: var(--border-radius);
    margin-top: 10px;
    font-size: 0.9rem;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Custom Scrollbar for Tabs */
.tabs-container {
    overflow-x: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--primary-color) #f1f3f9;
}

.tabs-container::-webkit-scrollbar {
    height: 10px;
}

.tabs-container::-webkit-scrollbar-thumb {
    background-color: var(--primary-color);
    border-radius: var(--thumb-border-radius);
}

.tabs-container::-webkit-scrollbar-track {
    background-color: #f1f3f9;
}

/* Header Section */
.header {
    text-align: center;
    margin-bottom: 30px;
    animation: fadeIn 1s ease-in-out;
}

.logo-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
}

.logo {
    width: 60px;
    height: 60px;
    border-radius: 16px;
    margin-bottom: 21px;
}

.platform-title {
    font-size: 2rem;
    color: var(--primary-color);
    font-weight: bold;
}

.platform-caption {
    font-size: 1.2rem;
    color: var(--dark-color);
    margin-top: 10px;
}

/* QR Code Generator Card */
.qr-card {
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: 0 10px 30px var(--shadow-color);
    padding: 30px;
    margin-bottom: 30px;
    animation: fadeInUp 1s ease-in-out;
}

/* Platform Explanation Section */
.platform-info {
    text-align: center;
    padding: 40px 20px;
    background-color: #f8f9fc;
    border-radius: var(--border-radius);
    box-shadow: 0 10px 30px var(--shadow-color);
    animation: fadeIn 1.5s ease-in-out;
    margin-top: 5rem;
}

.platform-info h2 {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.info-item {
    text-align: center;
    padding: 20px;
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.info-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
}

.info-icon {
    width: 60px;
    height: 60px;
    margin-bottom: 15px;
}

.seo-text {
    margin-top: 30px;
    font-size: 1rem;
    color: #6c757d;
    line-height: 1.6;
}

.info-grid .info-item img{
    width: 185px;
    height: auto;
}

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

/* Media Queries */
@media (max-width: 768px) {
    .container {
        padding: 20px;
        margin: 0;
    }
    
    .logo-container{
        flex-direction: column;
    }

    .logo-container .logo {
        width: 100px;
        height: auto;
    }

    .logo-container h1{
        margin-bottom: 10px;
    }
    
    h1 {
        font-size: 1.8rem;
    }
    
    .tabs {
        flex-wrap: nowrap;
        overflow-x: auto;
        padding-bottom: 10px;
    }
    
    .tab {
        padding: 10px 15px;
        white-space: nowrap;
        flex: 0 0 auto;
        display: flex;
        flex-direction: column;
        gap: 5px;
        min-width: 80px;
    }
    
    .option-row {
        flex-direction: column;
        gap: 10px;
    }
}

@media (max-width: 480px) {
    body {
        padding: 10px;
    }
    
    .container {
        padding: 15px;
    }
    
    h1 {
        font-size: 1.5rem;
        margin-bottom: 20px;
    }
    
    .tab-content {
        padding: 15px;
    }
    
    input, textarea, select {
        padding: 10px;
    }
}