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

:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --secondary: #8b5cf6;
    --success: #10b981;
    --danger: #ef4444;
    --dark: #1f2937;
    --light: #f3f4f6;
    --white: #ffffff;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.15);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 10px;
    color: var(--dark);
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background: var(--white);
    border-radius: 20px;
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

/* Header */
.header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: var(--white);
    padding: 30px 20px;
    text-align: center;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin-bottom: 10px;
}

.logo i {
    font-size: 2.5rem;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.logo h1 {
    font-size: 2rem;
    font-weight: 700;
}

.tagline {
    font-size: 0.95rem;
    opacity: 0.9;
}

/* Mode Toggle */
.mode-toggle {
    display: flex;
    gap: 10px;
    padding: 20px;
    background: var(--light);
}

.mode-btn {
    flex: 1;
    padding: 15px;
    border: 2px solid transparent;
    background: var(--white);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--dark);
}

.mode-btn i {
    font-size: 1.2rem;
}

.mode-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.mode-btn.active {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: var(--white);
    border-color: var(--primary);
}

/* Main Content */
.main-content {
    padding: 20px;
}

.section {
    display: none;
}

.section.active {
    display: block;
}

/* Upload Area */
.upload-area {
    border: 3px dashed var(--primary);
    border-radius: 15px;
    padding: 40px 20px;
    text-align: center;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.05) 0%, rgba(139, 92, 246, 0.05) 100%);
    transition: all 0.3s ease;
    cursor: pointer;
}

.upload-area:hover {
    border-color: var(--secondary);
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);
    transform: scale(1.02);
}

.upload-area i {
    font-size: 3rem;
    color: var(--primary);
    margin-bottom: 15px;
}

.upload-area h3 {
    color: var(--dark);
    margin-bottom: 10px;
}

.upload-area p {
    color: #6b7280;
    margin-bottom: 20px;
}

/* Buttons */
.btn-primary, .btn-success, .btn-secondary {
    padding: 12px 30px;
    border: none;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: var(--white);
}

.btn-success {
    background: linear-gradient(135deg, var(--success) 0%, #059669 100%);
    color: var(--white);
    width: 100%;
    justify-content: center;
}

.btn-secondary {
    background: var(--light);
    color: var(--dark);
}

.btn-primary:hover, .btn-success:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.btn-secondary:hover {
    background: #e5e7eb;
}

/* Options Panel */
.options-panel {
    background: var(--light);
    border-radius: 15px;
    padding: 20px;
    margin-top: 20px;
}

.options-panel h3 {
    color: var(--dark);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

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

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

.option-group input[type="text"],
.option-group select {
    width: 100%;
    padding: 12px;
    border: 2px solid #e5e7eb;
    border-radius: 8px;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.option-group input[type="text"]:focus,
.option-group select:focus {
    outline: none;
    border-color: var(--primary);
}

.option-group input[type="range"] {
    width: calc(100% - 60px);
    margin-right: 10px;
}

.option-group input[type="color"] {
    width: 60px;
    height: 40px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
}

.range-value {
    display: inline-block;
    min-width: 50px;
    font-weight: 600;
    color: var(--primary);
}

.radio-group {
    display: flex;
    gap: 15px;
}

.radio-label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    padding: 10px 15px;
    background: var(--white);
    border-radius: 8px;
    transition: all 0.3s ease;
}

.radio-label:hover {
    background: #f9fafb;
}

.info-text {
    font-size: 0.9rem;
    color: #6b7280;
    margin-top: 5px;
}

/* Preview Area */
.preview-area {
    margin-top: 20px;
    text-align: center;
}

.preview-area h3 {
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

#canvas, #canvasRemove {
    max-width: 100%;
    height: auto;
    border-radius: 10px;
    box-shadow: var(--shadow);
    margin-bottom: 20px;
}

#videoPreview {
    max-width: 100%;
    border-radius: 10px;
    box-shadow: var(--shadow);
    margin-bottom: 20px;
}

.action-buttons {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.action-buttons button {
    flex: 1;
    min-width: 150px;
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    display: none;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    z-index: 1000;
}

.loading-overlay.active {
    display: flex;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 5px solid rgba(255, 255, 255, 0.3);
    border-top-color: var(--white);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.loading-overlay p {
    color: var(--white);
    margin-top: 20px;
    font-size: 1.2rem;
}

/* Footer */
.footer {
    background: var(--dark);
    color: var(--white);
    text-align: center;
    padding: 20px;
    margin-top: 20px;
}

.footer i {
    color: var(--danger);
    animation: heartbeat 1.5s ease-in-out infinite;
}

@keyframes heartbeat {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

/* Responsive Design for Android */
@media (max-width: 768px) {
    body {
        padding: 5px;
    }

    .container {
        border-radius: 15px;
    }

    .header {
        padding: 20px 15px;
    }

    .logo h1 {
        font-size: 1.5rem;
    }

    .logo i {
        font-size: 2rem;
    }

    .mode-toggle {
        padding: 15px;
    }

    .mode-btn {
        padding: 12px;
        font-size: 0.85rem;
    }

    .mode-btn span {
        display: none;
    }

    .mode-btn i {
        font-size: 1.5rem;
    }

    .main-content {
        padding: 15px;
    }

    .upload-area {
        padding: 30px 15px;
    }

    .upload-area i {
        font-size: 2.5rem;
    }

    .options-panel {
        padding: 15px;
    }

    .action-buttons {
        flex-direction: column;
    }

    .action-buttons button {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .logo h1 {
        font-size: 1.3rem;
    }

    .tagline {
        font-size: 0.85rem;
    }

    .upload-area h3 {
        font-size: 1.1rem;
    }

    .upload-area p {
        font-size: 0.9rem;
    }

    .btn-primary, .btn-success, .btn-secondary {
        padding: 10px 20px;
        font-size: 0.9rem;
    }
}