/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 30%, #334155 70%, #475569 100%);
    min-height: 100vh;
    color: #333;
    line-height: 1.6;
    position: relative;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 20% 80%, rgba(59, 130, 246, 0.15) 0%, transparent 50%),
                radial-gradient(circle at 80% 20%, rgba(16, 185, 129, 0.15) 0%, transparent 50%),
                radial-gradient(circle at 40% 40%, rgba(139, 92, 246, 0.1) 0%, transparent 50%);
    pointer-events: none;
    z-index: -1;
    will-change: transform;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
}

/* Header Styles */
.header {
    text-align: center;
    margin-bottom: 40px;
    color: white;
    padding: 20px;
    background: rgba(0, 0, 0, 0.1);
    border-radius: 20px;
    backdrop-filter: blur(10px);
}

.header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 10px;
    text-shadow: 0 2px 8px rgba(0,0,0,0.5);
    background: linear-gradient(135deg, #ffffff 0%, #e2e8f0 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header p {
    font-size: 1.1rem;
    opacity: 0.95;
    font-weight: 300;
    text-shadow: 0 1px 4px rgba(0,0,0,0.3);
    margin-bottom: 20px;
}

.header-keywords {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
    margin-top: 15px;
}

.keyword-tag {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    transition: all 0.3s ease;
}

.keyword-tag:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
}

/* Use Cases Section */
.use-cases-section {
    background: rgba(255, 255, 255, 0.98);
    border-radius: 24px;
    padding: 40px;
    margin-bottom: 30px;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.15);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
    margin-top: 25px;
}

.use-case-card {
    background: linear-gradient(135deg, #ffffff 0%, #f1f5f9 100%);
    border-radius: 20px;
    padding: 32px;
    text-align: center;
    transition: all 0.4s ease;
    border: 2px solid transparent;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

.use-case-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 25px 60px rgba(59, 130, 246, 0.25);
    border-color: #3b82f6;
}

.use-case-card i {
    font-size: 3rem;
    color: #3b82f6;
    margin-bottom: 15px;
    display: block;
}

.use-case-card h3 {
    font-size: 1.3rem;
    font-weight: 600;
    color: #2d3748;
    margin-bottom: 10px;
}

.use-case-card p {
    color: #4a5568;
    font-size: 0.95rem;
    line-height: 1.6;
}

/* Main Content */
.main-content {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

/* Section Styles */
section {
    background: rgba(255, 255, 255, 0.98);
    border-radius: 24px;
    padding: 40px;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.15);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

section h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 20px;
    color: #2d3748;
    display: flex;
    align-items: center;
    gap: 10px;
}

/* Device Section */
.device-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-bottom: 20px;
}

.device-card {
    background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
    border-radius: 20px;
    padding: 32px;
    border: 2px solid #e2e8f0;
    transition: all 0.4s ease;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

.device-card:hover {
    border-color: #3b82f6;
    transform: translateY(-4px);
    box-shadow: 0 12px 35px rgba(59, 130, 246, 0.2);
}

.device-card h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 15px;
    color: #2d3748;
    display: flex;
    align-items: center;
    gap: 8px;
}

.device-select {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #e2e8f0;
    border-radius: 10px;
    font-size: 1rem;
    background: white;
    transition: all 0.3s ease;
    margin-bottom: 10px;
}

.device-select:focus {
    outline: none;
    border-color: #3b82f6;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.device-info {
    margin-top: 10px;
    padding: 8px 12px;
    background: #e6fffa;
    border-radius: 8px;
    font-size: 0.9rem;
    color: #2d3748;
}

.device-note {
    margin-top: 8px;
}

.device-note small {
    color: #718096;
    font-size: 0.85rem;
}

/* Button Styles */
.button-group {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
    justify-content: center;
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    min-width: 140px;
    justify-content: center;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}

.btn:active {
    transform: translateY(0);
}

.btn-primary {
    background: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
    color: white;
}

.btn-secondary {
    background: #e2e8f0;
    color: #2d3748;
}

.btn-secondary:hover {
    background: #cbd5e0;
}

.btn-danger {
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
    color: white;
}

.btn-warning {
    background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
    color: white;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.btn:disabled:hover {
    transform: none;
    box-shadow: none;
}

/* Controls Section */
.controls-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 25px;
}

.control-group {
    background: #f8fafc;
    border-radius: 15px;
    padding: 25px;
    border: 2px solid #e2e8f0;
}

.control-group h3 {
    font-size: 1.2rem;
    font-weight: 600;
    color: #2d3748;
    margin-bottom: 15px;
}

.volume-controls {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.volume-control {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.volume-control label {
    font-weight: 500;
    color: #2d3748;
    display: flex;
    align-items: center;
    gap: 8px;
}

.volume-slider {
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: #e2e8f0;
    outline: none;
    appearance: none;
}

.volume-slider::-webkit-slider-thumb {
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: #3b82f6;
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
}

.volume-slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: #3b82f6;
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
}

.volume-value {
    font-weight: 600;
    color: #3b82f6;
    font-size: 0.9rem;
}

/* Status Section */
.status-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

.status-card {
    background: #f8fafc;
    border-radius: 15px;
    padding: 20px;
    border: 2px solid #e2e8f0;
    display: flex;
    align-items: center;
    gap: 15px;
    transition: all 0.3s ease;
}

.status-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
}

.status-indicator {
    font-size: 1.2rem;
    color: #cbd5e0;
}

.status-indicator.connected {
    color: #10b981;
}

.status-indicator.active {
    color: #3b82f6;
}

.status-indicator.muted {
    color: #f59e0b;
}

.status-text h4 {
    font-size: 1rem;
    font-weight: 600;
    color: #2d3748;
    margin-bottom: 4px;
}

.status-text p {
    font-size: 0.9rem;
    color: #718096;
}

/* Audio Visualization */
.visualization-container {
    background: #f8fafc;
    border-radius: 15px;
    padding: 20px;
    border: 2px solid #e2e8f0;
    text-align: center;
}

#audioVisualizer {
    max-width: 100%;
    height: auto;
    border-radius: 10px;
    background: #2d3748;
}

/* Features Section */
.features-section {
    background: rgba(255, 255, 255, 0.98);
    border-radius: 24px;
    padding: 40px;
    margin-bottom: 30px;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.15);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 25px;
    margin-top: 25px;
}

.feature-item {
    background: linear-gradient(135deg, #ffffff 0%, #f1f5f9 100%);
    border-radius: 20px;
    padding: 32px;
    text-align: center;
    transition: all 0.4s ease;
    border: 2px solid transparent;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

.feature-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 35px rgba(59, 130, 246, 0.15);
    border-color: #3b82f6;
}

.feature-item i {
    font-size: 2.5rem;
    color: #3b82f6;
    margin-bottom: 15px;
    display: block;
}

.feature-item h3 {
    font-size: 1.2rem;
    font-weight: 600;
    color: #2d3748;
    margin-bottom: 10px;
}

.feature-item p {
    color: #4a5568;
    font-size: 0.95rem;
    line-height: 1.6;
}

/* FAQ Section */
.faq-section {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    padding: 30px;
    margin-bottom: 30px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.faq-container {
    margin-top: 25px;
}

.faq-item {
    border: 2px solid #e2e8f0;
    border-radius: 15px;
    margin-bottom: 15px;
    overflow: hidden;
    transition: all 0.3s ease;
}

.faq-item:hover {
    border-color: #3b82f6;
}

.faq-question {
    width: 100%;
    background: #f8fafc;
    border: none;
    padding: 20px 25px;
    text-align: left;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 1.1rem;
    font-weight: 500;
    color: #2d3748;
    transition: all 0.3s ease;
}

.faq-question:hover {
    background: #e2e8f0;
}

.faq-question i {
    transition: transform 0.3s ease;
    color: #3b82f6;
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    background: white;
}

.faq-answer p {
    padding: 20px 25px;
    color: #4a5568;
    line-height: 1.7;
    margin: 0;
}

.faq-item.active .faq-answer {
    max-height: 500px;
}

.faq-item.active .faq-question {
    background: #3b82f6;
    color: white;
}

.faq-item.active .faq-question i {
    color: white;
    transform: rotate(180deg);
}

/* Instructions Section */
.instructions-section {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    padding: 30px;
    margin-bottom: 30px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.instructions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
    margin-top: 25px;
}

.instruction-step {
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    border-radius: 15px;
    padding: 25px;
    text-align: center;
    position: relative;
    border: 2px solid transparent;
    transition: all 0.3s ease;
}

.instruction-step:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 35px rgba(59, 130, 246, 0.15);
    border-color: #3b82f6;
}

.step-number {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0 auto 15px;
}

.instruction-step h3 {
    font-size: 1.2rem;
    font-weight: 600;
    color: #2d3748;
    margin-bottom: 10px;
}

.instruction-step p {
    color: #4a5568;
    font-size: 0.95rem;
    line-height: 1.6;
}

/* Privacy Section */
.privacy-section {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    padding: 30px;
    margin-bottom: 30px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.privacy-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 25px;
    margin-top: 25px;
}

.privacy-card {
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    border-radius: 15px;
    padding: 25px;
    border: 2px solid transparent;
    transition: all 0.3s ease;
}

.privacy-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 35px rgba(59, 130, 246, 0.15);
    border-color: #3b82f6;
}

.privacy-card h3 {
    font-size: 1.2rem;
    font-weight: 600;
    color: #2d3748;
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.privacy-card h3 i {
    color: #3b82f6;
}

.privacy-card ul {
    list-style: none;
    padding: 0;
}

.privacy-card li {
    color: #4a5568;
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 8px;
    padding-left: 20px;
    position: relative;
}

.privacy-card li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #10b981;
    font-weight: bold;
}

/* Notifications */
.notifications {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
    max-width: 300px;
}

.notification {
    background: white;
    border-radius: 10px;
    padding: 15px 20px;
    margin-bottom: 10px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
    border-left: 4px solid #3b82f6;
    animation: slideIn 0.3s ease;
}

.notification.success {
    border-left-color: #10b981;
}

.notification.error {
    border-left-color: #ef4444;
}

.notification.warning {
    border-left-color: #f59e0b;
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* Footer Styles */
.footer {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    margin-top: 40px;
    padding: 40px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-bottom: 30px;
}

.footer-section h3 {
    color: #2d3748;
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 15px;
}

.footer-section h4 {
    color: #2d3748;
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 12px;
}

.footer-section p {
    color: #4a5568;
    line-height: 1.6;
    margin-bottom: 15px;
}

.footer-section ul {
    list-style: none;
    padding: 0;
}

.footer-section li {
    color: #4a5568;
    margin-bottom: 8px;
    padding-left: 15px;
    position: relative;
    line-height: 1.5;
}

.footer-section li::before {
    content: "▸";
    position: absolute;
    left: 0;
    color: #3b82f6;
    font-weight: bold;
}

.footer-keywords {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 15px;
}

.footer-keywords span {
    background: #e2e8f0;
    color: #2d3748;
    padding: 4px 8px;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 500;
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 2px solid #e2e8f0;
}

.footer-bottom p {
    color: #4a5568;
    margin-bottom: 8px;
}

.footer-links a {
    color: #3b82f6;
    text-decoration: none;
    font-weight: 500;
}

.footer-links a:hover {
    color: #1d4ed8;
    text-decoration: underline;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    .header h1 {
        font-size: 2rem;
    }
    
    .header p {
        font-size: 1rem;
    }
    
    section {
        padding: 20px;
    }
    
    .device-grid {
        grid-template-columns: 1fr;
    }
    
    .controls-grid {
        grid-template-columns: 1fr;
    }
    
    .status-grid {
        grid-template-columns: 1fr;
    }
    
    .use-cases-grid {
        grid-template-columns: 1fr;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .instructions-grid {
        grid-template-columns: 1fr;
    }
    
    .privacy-content {
        grid-template-columns: 1fr;
    }
    
    .button-group {
        flex-direction: column;
        align-items: stretch;
    }
    
    .btn {
        min-width: auto;
        width: 100%;
    }
    
    .volume-controls {
        gap: 15px;
    }
    
    .notifications {
        left: 15px;
        right: 15px;
        max-width: none;
    }
    
    .footer {
        padding: 25px;
        margin-top: 30px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .header-keywords {
        gap: 8px;
    }
    
    .keyword-tag {
        font-size: 0.8rem;
        padding: 5px 10px;
    }
}

@media (max-width: 480px) {
    .header h1 {
        font-size: 1.8rem;
    }
    
    section {
        padding: 15px;
    }
    
    .use-case-card,
    .feature-item,
    .instruction-step,
    .privacy-card {
        padding: 20px;
    }
    
    .faq-question {
        padding: 15px 20px;
        font-size: 1rem;
    }
    
    .faq-answer p {
        padding: 15px 20px;
    }
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    body {
        background: linear-gradient(135deg, #0f172a 0%, #1e293b 30%, #334155 70%, #475569 100%);
        color: #e2e8f0;
    }
    
    .header {
        background: rgba(0, 0, 0, 0.3);
    }
    
    .header h1 {
        background: linear-gradient(135deg, #ffffff 0%, #cbd5e0 100%);
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
    }
    
    .keyword-tag {
        background: rgba(59, 130, 246, 0.3);
        border-color: rgba(96, 165, 250, 0.5);
    }
    
    .keyword-tag:hover {
        background: rgba(59, 130, 246, 0.4);
    }
    
    section {
        background: rgba(45, 55, 72, 0.95);
        color: #e2e8f0;
        border-color: rgba(75, 85, 104, 0.3);
    }
    
    section h2 {
        color: #e2e8f0;
    }
    
    .device-card,
    .control-group,
    .status-card,
    .use-case-card,
    .feature-item,
    .instruction-step,
    .privacy-card {
        background: linear-gradient(135deg, #2d3748 0%, #374151 100%);
        border-color: #4a5568;
        color: #e2e8f0;
    }
    
    .device-card:hover,
    .use-case-card:hover,
    .feature-item:hover,
    .instruction-step:hover,
    .privacy-card:hover {
        background: linear-gradient(135deg, #374151 0%, #4a5568 100%);
        border-color: #60a5fa;
        box-shadow: 0 12px 35px rgba(96, 165, 250, 0.2);
    }
    
    .device-card h3,
    .control-group h3,
    .use-case-card h3,
    .feature-item h3,
    .instruction-step h3,
    .privacy-card h3 {
        color: #f1f5f9;
    }
    
    .use-case-card p,
    .feature-item p,
    .instruction-step p {
        color: #cbd5e0;
    }
    
    .device-select {
        background: #374151;
        color: #e2e8f0;
        border-color: #4a5568;
    }
    
    .device-select:focus {
        border-color: #60a5fa;
        box-shadow: 0 0 0 3px rgba(96, 165, 250, 0.1);
    }
    
    .device-info {
        background: rgba(16, 185, 129, 0.1);
        color: #d1fae5;
    }
    
    .faq-question {
        background: #374151;
        color: #e2e8f0;
    }
    
    .faq-question:hover {
        background: #4a5568;
    }
    
    .faq-answer {
        background: #2d3748;
    }
    
    .faq-answer p {
        color: #cbd5e0;
    }
    
    .privacy-card li {
        color: #cbd5e0;
    }
    
    .visualization-container {
        background: #374151;
        border-color: #4a5568;
    }
    
    #audioVisualizer {
        background: #1f2937;
        border-color: #4a5568;
    }
    
    .notification {
        background: #374151;
        color: #e2e8f0;
        border-left-color: #60a5fa;
    }
    
    .btn-secondary {
        background: #4a5568;
        color: #e2e8f0;
    }
    
    .btn-secondary:hover {
        background: #6b7280;
    }
    
    .footer {
        background: rgba(45, 55, 72, 0.95);
        border-color: rgba(75, 85, 104, 0.3);
    }
    
    .footer-section h3,
    .footer-section h4 {
        color: #f1f5f9;
    }
    
    .footer-section p,
    .footer-section li {
        color: #cbd5e0;
    }
    
    .footer-keywords span {
        background: #4a5568;
        color: #e2e8f0;
    }
    
    .footer-bottom {
        border-top-color: #4a5568;
    }
    
    .footer-bottom p {
        color: #cbd5e0;
    }
    
    .footer-links a {
        color: #60a5fa;
    }
    
    .footer-links a:hover {
        color: #93c5fd;
    }
}