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

:root {
    --primary: #0066ff;
    --primary-dark: #0052cc;
    --success: #00d68f;
    --danger: #ff3d71;
    --warning: #ffaa00;
    --bg: #f7f9fc;
    --card-bg: #ffffff;
    --text: #192038;
    --text-light: #8f9bb3;
    --border: #e4e9f2;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    --radius: 12px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
}

#app {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

h1 {
    font-size: 28px;
    font-weight: 700;
    color: var(--text);
}

.connection-status {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: var(--card-bg);
    border-radius: 20px;
    box-shadow: var(--shadow);
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--danger);
    animation: pulse 2s infinite;
}

.status-dot.connected {
    background: var(--success);
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* Cards */
.card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 24px;
    margin-bottom: 20px;
    box-shadow: var(--shadow);
}

.card h2 {
    font-size: 20px;
    margin-bottom: 20px;
}

/* Setup Form */
.setup-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
    max-width: 400px;
}

input[type="text"] {
    padding: 12px 16px;
    border: 2px solid var(--border);
    border-radius: 8px;
    font-size: 16px;
    transition: border-color 0.3s;
}

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

.help-text {
    font-size: 14px;
    color: var(--text-light);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-primary {
    background: var(--primary);
    color: white;
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

.btn-large {
    padding: 16px 32px;
    font-size: 18px;
}

.btn-sync {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    width: 100%;
    margin: 20px 0;
}

.btn-sync.active {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

.btn-icon {
    font-size: 20px;
}

/* Dashboard */
.dashboard {
    display: grid;
    gap: 20px;
}

@media (min-width: 768px) {
    .dashboard {
        grid-template-columns: 1fr 1fr;
    }
    
    .sync-controls {
        grid-column: 1 / -1;
    }
}

/* Sync Controls */
.sync-status {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 20px;
    background: var(--bg);
    border-radius: 8px;
    font-weight: 600;
}

.status-indicator {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--text-light);
}

.status-indicator.active {
    background: var(--success);
    box-shadow: 0 0 0 3px rgba(0, 214, 143, 0.2);
    animation: pulse 1s infinite;
}

/* Sync Settings */
.sync-settings {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px solid var(--border);
}

.setting-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.setting-group label {
    font-weight: 600;
    font-size: 14px;
    color: var(--text-light);
}

.slider {
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: var(--border);
    outline: none;
    -webkit-appearance: none;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary);
    cursor: pointer;
}

.select {
    padding: 10px 16px;
    border: 2px solid var(--border);
    border-radius: 8px;
    font-size: 16px;
    background: white;
}

/* Color Preview */
.color-preview {
    margin-top: 24px;
    text-align: center;
}

.preview-box {
    width: 100%;
    height: 100px;
    border-radius: 8px;
    margin: 12px 0;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
    transition: background-color 0.3s;
}

.color-info {
    font-family: monospace;
    color: var(--text-light);
}

/* Lights Grid */
.lights-grid,
.groups-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 16px;
}

.light-card,
.group-card {
    padding: 16px;
    background: var(--bg);
    border-radius: 8px;
    text-align: center;
    transition: all 0.3s;
    cursor: pointer;
    position: relative;
}

.light-card:hover,
.group-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.light-card.selected,
.group-card.active {
    background: var(--primary);
    color: white;
}

.light-icon {
    font-size: 36px;
    margin-bottom: 8px;
}

.light-name {
    font-weight: 600;
    margin-bottom: 4px;
}

.brightness-control {
    margin-top: 12px;
}

.brightness-slider {
    width: 100%;
    height: 4px;
}

.sync-badge {
    position: absolute;
    top: 8px;
    right: 8px;
    background: var(--success);
    color: white;
    font-size: 12px;
    padding: 2px 8px;
    border-radius: 12px;
}

/* Toast Notifications */
.toast-container {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 1000;
}

.toast {
    background: white;
    padding: 16px 24px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    margin-bottom: 12px;
    animation: slideIn 0.3s;
}

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

.toast.success {
    border-left: 4px solid var(--success);
}

.toast.error {
    border-left: 4px solid var(--danger);
}

.toast.warning {
    border-left: 4px solid var(--warning);
}

/* Utilities */
.hidden {
    display: none !important;
}

/* Responsive */
@media (max-width: 768px) {
    #app {
        padding: 12px;
    }
    
    header {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }
    
    .lights-grid,
    .groups-grid {
        grid-template-columns: 1fr;
    }
}