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

:root {
    --bg-primary: #0d0d15;
    --bg-secondary: #1a1a2e;
    --bg-card: #16162a;
    --text-primary: #ffffff;
    --text-secondary: #a0a0b0;
    --accent-primary: #ff0096;
    --accent-secondary: #00d4ff;
    --accent-gradient: linear-gradient(135deg, #ff0096, #00d4ff);
    --border-color: #2a2a4a;
    --success: #00ff88;
    --error: #ff4466;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

.app-container {
    max-width: 600px;
    margin: 0 auto;
    padding: 20px;
    padding-bottom: 100px;
}

.header {
    text-align: center;
    padding: 30px 0;
    position: relative;
}

.logo {
    margin-bottom: 15px;
}

.logo-text {
    font-size: 48px;
    font-weight: 800;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: 4px;
}

.tagline {
    color: var(--text-secondary);
    font-size: 14px;
    max-width: 280px;
    margin: 0 auto;
}

.install-btn {
    position: absolute;
    top: 30px;
    right: 0;
    background: transparent;
    border: 1px solid var(--accent-primary);
    color: var(--accent-primary);
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.install-btn:hover {
    background: var(--accent-primary);
    color: white;
}

.main-content {
    margin-top: 20px;
}

.form-section {
    background: var(--bg-card);
    border-radius: 16px;
    padding: 24px;
    margin-bottom: 20px;
    border: 1px solid var(--border-color);
}

.form-section h2 {
    font-size: 18px;
    margin-bottom: 20px;
    color: var(--text-primary);
    font-weight: 600;
}

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

.upload-group:last-child {
    margin-bottom: 0;
}

.label-text {
    display: block;
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 10px;
}

.required-star {
    color: var(--accent-primary);
}

.audio-tabs {
    display: flex;
    gap: 0;
    margin-bottom: 15px;
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.audio-tab {
    flex: 1;
    padding: 12px;
    background: var(--bg-secondary);
    border: none;
    color: var(--text-secondary);
    font-size: 14px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.audio-tab.active {
    background: var(--accent-primary);
    color: white;
}

.audio-tab:hover:not(.active) {
    background: var(--bg-card);
    color: var(--text-primary);
}

.sample-tracks {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.sample-track {
    display: flex;
    align-items: center;
    padding: 12px 15px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.sample-track:hover {
    border-color: var(--accent-secondary);
}

.sample-track input[type="radio"] {
    width: 18px;
    height: 18px;
    accent-color: var(--accent-primary);
    margin-right: 12px;
}

.sample-track input[type="radio"]:checked + .sample-info .sample-name {
    color: var(--accent-primary);
}

.sample-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.sample-name {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}

.sample-desc {
    font-size: 12px;
    color: var(--text-secondary);
}

.preview-btn {
    padding: 6px 12px;
    background: transparent;
    border: 1px solid var(--accent-secondary);
    border-radius: 15px;
    color: var(--accent-secondary);
    font-size: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.preview-btn:hover {
    background: var(--accent-secondary);
    color: var(--bg-primary);
}

.preview-btn.playing {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    color: white;
}

.upload-area {
    position: relative;
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    padding: 30px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    overflow: hidden;
}

.upload-area:hover {
    border-color: var(--accent-primary);
    background: rgba(255, 0, 150, 0.05);
}

.upload-area input[type="file"] {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
}

.upload-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.upload-icon {
    font-size: 32px;
}

.upload-text {
    color: var(--text-primary);
    font-size: 14px;
}

.upload-hint {
    color: var(--text-secondary);
    font-size: 12px;
}

.upload-preview {
    display: none;
}

.upload-preview.active {
    display: block;
}

.upload-preview .file-name {
    color: var(--success);
    font-size: 14px;
    word-break: break-all;
}

.form-row {
    margin-bottom: 16px;
}

.form-row:last-child {
    margin-bottom: 0;
}

.form-group {
    margin-bottom: 16px;
}

.form-group:last-child {
    margin-bottom: 0;
}

.form-group label {
    display: block;
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.form-group select,
.form-group input[type="text"] {
    width: 100%;
    padding: 14px 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    color: var(--text-primary);
    font-size: 16px;
    outline: none;
    transition: border-color 0.3s ease;
}

.form-group select:focus,
.form-group input[type="text"]:focus {
    border-color: var(--accent-primary);
}

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

.slider-group:last-child {
    margin-bottom: 0;
}

.slider-group label {
    display: block;
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 10px;
}

.slider-group input[type="range"] {
    width: 100%;
    height: 6px;
    background: var(--bg-secondary);
    border-radius: 3px;
    outline: none;
    -webkit-appearance: none;
}

.slider-group input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    background: var(--accent-gradient);
    border-radius: 50%;
    cursor: pointer;
}

.toggle-group {
    margin-bottom: 16px;
}

.toggle-group:last-child {
    margin-bottom: 0;
}

.toggle {
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
}

.toggle input {
    display: none;
}

.toggle-slider {
    width: 48px;
    height: 26px;
    background: var(--bg-secondary);
    border-radius: 13px;
    position: relative;
    transition: background 0.3s ease;
    flex-shrink: 0;
}

.toggle-slider::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    background: white;
    border-radius: 50%;
    top: 3px;
    left: 3px;
    transition: transform 0.3s ease;
}

.toggle input:checked + .toggle-slider {
    background: var(--accent-primary);
}

.toggle input:checked + .toggle-slider::after {
    transform: translateX(22px);
}

.toggle-text {
    font-size: 14px;
    color: var(--text-primary);
}

#textInputs {
    margin-top: 20px;
}

.generate-btn {
    width: 100%;
    padding: 18px;
    background: var(--accent-gradient);
    border: none;
    border-radius: 12px;
    color: white;
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.generate-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(255, 0, 150, 0.3);
}

.generate-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-loading {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.spinner {
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.progress-section {
    margin: 30px 0;
}

.progress-container {
    background: var(--bg-card);
    border-radius: 16px;
    padding: 30px;
    text-align: center;
    border: 1px solid var(--border-color);
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--bg-secondary);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 15px;
}

.progress-fill {
    height: 100%;
    background: var(--accent-gradient);
    width: 0%;
    transition: width 0.3s ease;
}

.progress-text {
    color: var(--text-secondary);
    font-size: 14px;
}

.result-section {
    background: var(--bg-card);
    border-radius: 16px;
    padding: 30px;
    text-align: center;
    border: 1px solid var(--border-color);
    margin-top: 30px;
}

.result-section h2 {
    font-size: 20px;
    margin-bottom: 20px;
    color: var(--success);
}

.video-preview {
    margin-bottom: 20px;
    border-radius: 12px;
    overflow: hidden;
    background: black;
}

.video-preview video {
    width: 100%;
    max-height: 400px;
    display: block;
}

.result-actions {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.download-btn {
    display: block;
    padding: 16px;
    background: var(--accent-gradient);
    border: none;
    border-radius: 12px;
    color: white;
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    text-align: center;
    cursor: pointer;
}

.another-btn {
    padding: 16px;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    color: var(--text-primary);
    font-size: 16px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.another-btn:hover {
    border-color: var(--accent-secondary);
    color: var(--accent-secondary);
}

.save-instructions {
    margin-top: 20px;
    padding: 15px;
    background: var(--bg-secondary);
    border-radius: 10px;
    text-align: left;
}

.save-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--accent-secondary);
    margin-bottom: 10px;
}

.save-tip {
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 8px;
    line-height: 1.5;
}

.save-tip:last-child {
    margin-bottom: 0;
}

.save-tip strong {
    color: var(--text-primary);
}

.footer {
    text-align: center;
    padding: 30px 0;
    color: var(--text-secondary);
    font-size: 12px;
}

.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 20px;
}

.modal-content {
    background: var(--bg-card);
    border-radius: 16px;
    padding: 30px;
    max-width: 400px;
    width: 100%;
    position: relative;
    border: 1px solid var(--border-color);
}

.modal-close {
    position: absolute;
    top: 15px;
    right: 15px;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 24px;
    cursor: pointer;
}

.modal-content h2 {
    margin-bottom: 20px;
    text-align: center;
}

.install-option {
    margin-bottom: 24px;
}

.install-option:last-child {
    margin-bottom: 0;
}

.install-option h3 {
    font-size: 16px;
    margin-bottom: 12px;
    color: var(--accent-secondary);
}

.install-option ol {
    padding-left: 20px;
    color: var(--text-secondary);
    font-size: 14px;
}

.install-option li {
    margin-bottom: 8px;
}

.error-message {
    background: rgba(255, 68, 102, 0.1);
    border: 1px solid var(--error);
    border-radius: 10px;
    padding: 16px;
    margin-bottom: 20px;
    color: var(--error);
    font-size: 14px;
}

@media (min-width: 768px) {
    .app-container {
        padding: 40px;
    }
    
    .logo-text {
        font-size: 64px;
    }
    
    .tagline {
        font-size: 16px;
        max-width: 400px;
    }
}