:root {
    --bg-color: #0f172a;
    --text-color: #f8fafc;
    --text-muted: #94a3b8;
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --success: #10b981;
    --success-hover: #059669;
    --accent: #8b5cf6;
    --accent-hover: #7c3aed;
    --card-bg: rgba(30, 41, 59, 0.7);
    --border: rgba(255, 255, 255, 0.1);
    --radius: 16px;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-image: 
        radial-gradient(at 0% 0%, rgba(59, 130, 246, 0.15) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(139, 92, 246, 0.15) 0px, transparent 50%);
    background-attachment: fixed;
}

.container {
    width: 100%;
    max-width: 500px;
    padding: 2rem;
}

header {
    text-align: center;
    margin-bottom: 2rem;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 800;
    letter-spacing: -1px;
}

header h1 span {
    color: var(--primary);
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

header p {
    color: var(--text-muted);
    margin-top: 0.5rem;
}

.card {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 2rem;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.card h2 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.card p {
    color: var(--text-muted);
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
    line-height: 1.5;
}

.hidden {
    display: none !important;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

input[type="text"] {
    width: 100%;
    padding: 1rem;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: rgba(15, 23, 42, 0.6);
    color: var(--text-color);
    font-size: 1rem;
    font-family: inherit;
    transition: border-color 0.3s, box-shadow 0.3s;
}

input[type="text"]:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.btn {
    width: 100%;
    padding: 1rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s, transform 0.1s, box-shadow 0.2s;
    font-family: inherit;
    color: white;
}

.btn:active {
    transform: scale(0.98);
}

.btn.primary {
    background-color: var(--primary);
}
.btn.primary:hover {
    background-color: var(--primary-hover);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.btn.success {
    background-color: var(--success);
}
.btn.success:hover {
    background-color: var(--success-hover);
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
}

.btn.accent {
    background: linear-gradient(135deg, var(--accent), var(--primary));
}
.btn.accent:hover {
    box-shadow: 0 8px 20px rgba(139, 92, 246, 0.4);
}

.pulse {
    animation: pulse-animation 2s infinite;
}

@keyframes pulse-animation {
    0% { box-shadow: 0 0 0 0 rgba(139, 92, 246, 0.7); }
    70% { box-shadow: 0 0 0 10px rgba(139, 92, 246, 0); }
    100% { box-shadow: 0 0 0 0 rgba(139, 92, 246, 0); }
}

.device-view {
    margin-bottom: 2rem;
}

.device-view h3 {
    margin-bottom: 0.5rem;
    font-size: 1.2rem;
}

.qr-container {
    background: white;
    padding: 1rem;
    border-radius: 12px;
    display: inline-block;
    margin-top: 1rem;
}

.qr-container img {
    display: block;
    width: 200px;
    height: 200px;
}

.alert {
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
    line-height: 1.4;
}
.alert.info {
    background-color: rgba(59, 130, 246, 0.1);
    border-left: 4px solid var(--primary);
    color: #bfdbfe;
}

.divider {
    border: 0;
    height: 1px;
    background: var(--border);
    margin: 2rem 0;
}

.status-text {
    margin-top: 0.75rem;
    font-size: 0.85rem;
    color: var(--text-muted);
    min-height: 1rem;
    font-weight: 500;
}