:root {
    --primary: #1E3A8A;
    --secondary: #0D9488;
    --accent: #F59E0B;
    --success: #10B981;
    --danger: #EF4444;
    --warning: #F59E0B;
    --light-bg: #F9FAFB;
    --dark-text: #1F2937;
    --medium-gray: #6B7280;
    --light-gray: #E5E7EB;
    --border-radius: 12px;
    --box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Inter', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    height: 100vh;
    overflow: hidden;
}

.customer-display {
    display: flex;
    flex-direction: column;
    height: 100vh;
    background: var(--light-bg);
    color: var(--dark-text);
    border-radius: 20px;
    margin: 20px;
    overflow: hidden;
    box-shadow: var(--box-shadow);
    position: relative;
}

/* Connection Status */
.connection-status {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 10px 20px;
    display: flex;
    align-items: center;
    gap: 10px;
    z-index: 1000;
    transform: translateY(-100%);
    transition: transform 0.3s ease;
}

.connection-status.show {
    transform: translateY(0);
}

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

.status-indicator.connecting {
    background: var(--warning);
    animation: pulse 1.5s infinite;
}

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

.status-indicator.disconnected {
    background: var(--danger);
}

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

/* Content Area */
.content {
    flex: 1;
    overflow: hidden;
    position: relative;
}

.screen {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    padding: 30px;
    opacity: 0;
    transform: translateY(20px);
    transition: var(--transition);
    overflow-y: auto;
}

.screen.active {
    opacity: 1;
    transform: translateY(0);
}

/* Welcome Screen */
.welcome-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    text-align: center;
}

.store-logo {
    margin-bottom: 40px;
    color: var(--primary);
}

.store-logo i {
    font-size: 4rem;
    margin-bottom: 20px;
}

.store-logo h1 {
    font-size: 3rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.welcome-message h2 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    color: var(--dark-text);
}

.store-tagline {
    font-size: 1.2rem;
    color: var(--medium-gray);
    margin-bottom: 40px;
}