:root {
    --bg-color: #0f172a;
    --card-bg: rgba(30, 41, 59, 0.7);
    --primary-color: #3b82f6;
    --danger-color: #ef4444;
    --text-color: #f8fafc;
    --text-muted: #94a3b8;
    --glow-color: rgba(59, 130, 246, 0.5);
}

body {
    margin: 0;
    padding: 0;
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    overflow: hidden;
    background-image: radial-gradient(circle at 50% 50%, #1e293b 0%, #0f172a 100%);
}

.container {
    width: 100%;
    max-width: 400px;
    padding: 20px;
}

.card {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    border-radius: 24px;
    padding: 40px 30px;
    text-align: center;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.1);
    position: relative;
    overflow: hidden;
}

.status-indicator {
    width: 36px;
    height: 36px;
    background-color: var(--text-muted);
    border-radius: 50%;
    margin: 0 auto 20px;
    box-shadow: 0 0 10px rgba(0,0,0,0.2);
    transition: all 0.3s ease;
}

.status-indicator.active {
    background-color: #10b981;
    box-shadow: 0 0 15px #10b981;
}

.title {
    font-size: 2rem;
    font-weight: 600;
    margin: 0 0 8px;
    background: linear-gradient(to right, #60a5fa, #a78bfa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    color: var(--text-muted);
    margin: 0 0 40px;
    font-size: 0.9rem;
}

.controls {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.btn {
    border: none;
    padding: 16px;
    border-radius: 16px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    color: white;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary {
    background: linear-gradient(135deg, #3b82f6, #2563eb);
    box-shadow: 0 4px 15px rgba(37, 99, 235, 0.3);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(37, 99, 235, 0.4);
}

.btn-danger {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger-color);
    border: 1px solid rgba(239, 68, 68, 0.2);
}

.btn-danger:hover:not(:disabled) {
    background: rgba(239, 68, 68, 0.2);
}

.visualizer {
    display: flex;
    justify-content: center;
    gap: 6px;
    height: 40px;
    margin-top: 40px;
    align-items: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.visualizer.active {
    opacity: 1;
}

.bar {
    width: 6px;
    height: 10px;
    background-color: var(--primary-color);
    border-radius: 3px;
    animation: bounce 1s infinite ease-in-out;
}

.bar:nth-child(1) { animation-delay: 0.0s; }
.bar:nth-child(2) { animation-delay: 0.1s; }
.bar:nth-child(3) { animation-delay: 0.2s; }
.bar:nth-child(4) { animation-delay: 0.3s; }
.bar:nth-child(5) { animation-delay: 0.4s; }

@keyframes bounce {
    0%, 100% { height: 10px; opacity: 0.5; }
    50% { height: 30px; opacity: 1; }
}