:root {
    --bg-dark: #0f172a;
    --card-bg: rgba(30, 41, 59, 0.7);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --border-color: rgba(255, 255, 255, 0.1);
    
    /* LED Colors */
    --led1-color: #00d2ff;
    --led2-color: #ff00ea;
    --led3-color: #ffaa00;
    --led4-color: #00ffaa;
    
    --success: #10b981;
    --danger: #ef4444;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    background-image: 
        radial-gradient(circle at 15% 50%, rgba(0, 210, 255, 0.05), transparent 25%),
        radial-gradient(circle at 85% 30%, rgba(255, 0, 234, 0.05), transparent 25%);
}

.app-container {
    width: 100%;
    max-width: 1000px;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* Header */
.app-header {
    text-align: center;
    margin-bottom: 1rem;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

h1 {
    font-size: 2rem;
    font-weight: 700;
    background: linear-gradient(to right, #fff, #94a3b8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 0.9rem;
    text-align: left;
}

/* Status Indicator */
.status-indicator {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(0,0,0,0.3);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
    border: 1px solid var(--border-color);
}

.status-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.status-dot.connected {
    background-color: var(--success);
    box-shadow: 0 0 10px var(--success);
}

.status-dot.demo {
    background-color: var(--led3-color);
    box-shadow: 0 0 10px var(--led3-color);
}

.status-dot.offline {
    background-color: var(--danger);
    box-shadow: 0 0 10px var(--danger);
}

/* Master Controls */
.master-controls {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    border: none;
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: 'Inter', sans-serif;
}

.btn-primary {
    background: rgba(255,255,255,0.1);
    color: white;
    border: 1px solid rgba(255,255,255,0.2);
}

.btn-primary:hover {
    background: rgba(255,255,255,0.2);
}

.btn-secondary {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    color: white;
    border-color: rgba(255,255,255,0.3);
}

.btn-outline {
    background: transparent;
    color: var(--text-primary);
    border: 1px dashed var(--border-color);
}

.btn-outline:hover {
    border-color: var(--text-secondary);
}

.btn-config {
    background: transparent;
    border: 1px solid var(--border-color);
    padding: 0.75rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-config:hover {
    background: rgba(255,255,255,0.1);
}

/* Grid Layout */
.grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.5rem;
}

/* Cards */
.card {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    border-color: rgba(255,255,255,0.2);
}

.card-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.led-icon {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background-color: #334155;
    transition: all 0.3s ease;
}

.card.is-on .led-icon {
    background-color: var(--led-color);
    box-shadow: 0 0 15px var(--led-color), 0 0 30px var(--led-color);
}

.card-body {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
}

.path-label {
    font-family: monospace;
    font-size: 0.8rem;
    color: var(--text-secondary);
    background: rgba(0,0,0,0.3);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
}

.state-label {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-secondary);
    transition: color 0.3s ease;
}

.card.is-on .state-label {
    color: var(--text-primary);
}

/* Toggle Switch */
.toggle-switch {
    position: relative;
    display: inline-block;
    width: 80px;
    height: 40px;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #334155;
    transition: .4s;
    border-radius: 40px;
    border: 1px solid #1e293b;
    box-shadow: inset 0 2px 5px rgba(0,0,0,0.5);
}

.slider:before {
    position: absolute;
    content: "";
    height: 32px;
    width: 32px;
    left: 4px;
    bottom: 3px;
    background-color: #94a3b8;
    transition: .4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    border-radius: 50%;
    box-shadow: 0 2px 5px rgba(0,0,0,0.3);
}

input:checked + .slider {
    background-color: rgba(255,255,255,0.1);
}

.card[data-led="led1"] input:checked + .slider { border-color: var(--led1-color); }
.card[data-led="led2"] input:checked + .slider { border-color: var(--led2-color); }
.card[data-led="led3"] input:checked + .slider { border-color: var(--led3-color); }
.card[data-led="led4"] input:checked + .slider { border-color: var(--led4-color); }

input:checked + .slider:before {
    transform: translateX(40px);
    background-color: #fff;
}

.card[data-led="led1"] input:checked + .slider:before { box-shadow: 0 0 10px var(--led1-color); }
.card[data-led="led2"] input:checked + .slider:before { box-shadow: 0 0 10px var(--led2-color); }
.card[data-led="led3"] input:checked + .slider:before { box-shadow: 0 0 10px var(--led3-color); }
.card[data-led="led4"] input:checked + .slider:before { box-shadow: 0 0 10px var(--led4-color); }

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 100;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.6);
    backdrop-filter: blur(5px);
    align-items: center;
    justify-content: center;
}

.modal.show {
    display: flex;
}

.modal-content {
    background: var(--bg-dark);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 2rem;
    width: 90%;
    max-width: 500px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.close-modal {
    color: var(--text-secondary);
    font-size: 1.5rem;
    font-weight: bold;
    cursor: pointer;
}

.close-modal:hover {
    color: white;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.form-group input {
    width: 100%;
    padding: 0.75rem;
    border-radius: 8px;
    background: rgba(0,0,0,0.2);
    border: 1px solid var(--border-color);
    color: white;
    font-family: monospace;
}

.form-group input:focus {
    outline: none;
    border-color: var(--led1-color);
}

/* Toast Notification */
.toast {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: rgba(30, 41, 59, 0.9);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    color: white;
    padding: 1rem 2rem;
    border-radius: 30px;
    transition: transform 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    z-index: 1000;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
}

/* Responsive */
@media (max-width: 600px) {
    .app-container {
        padding: 1rem;
    }
    
    .header-content {
        flex-direction: column;
        gap: 1rem;
    }
    
    .master-controls {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
}