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

:root {
    --bg-primary: #0a0f1a;
    --bg-secondary: #101828;
    --bg-card: #1a2438;
    --accent-cold: #00aaff;
    --accent-warm: #ff8800;
    --accent-green: #00ff88;
    --accent-red: #ff4466;
    --text-primary: #ffffff;
    --text-secondary: #7a8599;
    --glow-cold: rgba(0, 170, 255, 0.4);
    --glow-warm: rgba(255, 136, 0, 0.4);
}

body {
    font-family: 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    background-image:
        radial-gradient(ellipse at 20% 0%, rgba(0, 170, 255, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 0%, rgba(255, 136, 0, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 100%, rgba(0, 255, 136, 0.1) 0%, transparent 40%);
    color: var(--text-primary);
    min-height: 100vh;
}

/* Animated grid background */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image:
        linear-gradient(rgba(0,170,255,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0,170,255,0.03) 1px, transparent 1px);
    background-size: 50px 50px;
    animation: gridMove 20s linear infinite;
    pointer-events: none;
    z-index: 0;
}

@keyframes gridMove {
    0% { transform: translate(0, 0); }
    100% { transform: translate(50px, 50px); }
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 30px 20px;
    position: relative;
    z-index: 1;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
    animation: fadeInDown 0.6s ease-out;
}

@keyframes fadeInDown {
    from { opacity: 0; transform: translateY(-20px); }
    to { opacity: 1; transform: translateY(0); }
}

.header-left h1 {
    font-size: 2.2rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-cold), var(--accent-warm));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: 4px;
    display: block;
}

.connection-status {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: var(--bg-card);
    border-radius: 20px;
    font-size: 0.85rem;
}

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

.connection-status.connected .status-dot {
    background: var(--accent-green);
    box-shadow: 0 0 10px var(--accent-green);
}

.connection-status.disconnected .status-dot {
    background: var(--accent-red);
}

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

/* Main Display */
.main-display {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 30px;
    align-items: center;
    margin-bottom: 50px;
    animation: fadeInUp 0.6s ease-out 0.2s both;
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.sensor-card {
    background: var(--bg-card);
    border-radius: 24px;
    padding: 30px;
    text-align: center;
    position: relative;
    overflow: hidden;
    border: 2px solid transparent;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.sensor-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    opacity: 0;
    transition: opacity 0.3s;
}

.sensor-card:hover::before {
    opacity: 1;
}

.sensor-card.outdoor {
    border-color: rgba(0, 170, 255, 0.3);
}

.sensor-card.outdoor:hover,
.sensor-card.outdoor.online {
    border-color: var(--accent-cold);
    box-shadow: 0 10px 40px var(--glow-cold), inset 0 0 60px rgba(0, 170, 255, 0.05);
}

.sensor-card.indoor {
    border-color: rgba(255, 136, 0, 0.3);
}

.sensor-card.indoor:hover,
.sensor-card.indoor.online {
    border-color: var(--accent-warm);
    box-shadow: 0 10px 40px var(--glow-warm), inset 0 0 60px rgba(255, 136, 0, 0.05);
}

.sensor-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto 15px;
    opacity: 0.7;
}

.outdoor .sensor-icon {
    color: var(--accent-cold);
}

.indoor .sensor-icon {
    color: var(--accent-warm);
}

.sensor-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 10px;
}

.sensor-temp {
    font-size: 3.5rem;
    font-weight: 700;
    font-family: 'SF Mono', monospace;
    margin-bottom: 10px;
    transition: all 0.3s;
}

.outdoor .sensor-temp {
    background: linear-gradient(135deg, var(--accent-cold), #0088cc);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 0 40px var(--glow-cold);
}

.indoor .sensor-temp {
    background: linear-gradient(135deg, var(--accent-warm), #cc6600);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 0 40px var(--glow-warm);
}

.sensor-humidity {
    font-size: 1.5rem;
    color: var(--text-secondary);
    margin-bottom: 15px;
}

.sensor-battery {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* Differential Display */
.diff-display {
    background: var(--bg-card);
    border-radius: 20px;
    padding: 25px 35px;
    text-align: center;
    border: 2px solid rgba(0, 255, 136, 0.3);
    position: relative;
}

.diff-display.positive {
    border-color: var(--accent-warm);
    box-shadow: 0 0 30px rgba(255, 136, 0, 0.2);
}

.diff-display.negative {
    border-color: var(--accent-cold);
    box-shadow: 0 0 30px rgba(0, 170, 255, 0.2);
}

.diff-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 10px;
}

.diff-value {
    font-size: 2.5rem;
    font-weight: 700;
    font-family: 'SF Mono', monospace;
    color: var(--accent-green);
    margin-bottom: 10px;
}

.diff-display.positive .diff-value {
    color: var(--accent-warm);
}

.diff-display.negative .diff-value {
    color: var(--accent-cold);
}

.diff-indicator {
    font-size: 1.5rem;
    margin-bottom: 15px;
    animation: arrowPulse 1.5s infinite;
}

@keyframes arrowPulse {
    0%, 100% { opacity: 1; transform: translateX(0); }
    50% { opacity: 0.5; transform: translateX(5px); }
}

.efficiency-badge {
    display: inline-block;
    padding: 6px 14px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    background: rgba(255,255,255,0.1);
}

.efficiency-badge.optimal {
    background: rgba(0, 255, 136, 0.2);
    color: var(--accent-green);
}

.efficiency-badge.good {
    background: rgba(0, 170, 255, 0.2);
    color: var(--accent-cold);
}

.efficiency-badge.low {
    background: rgba(255, 68, 102, 0.2);
    color: var(--accent-red);
}

.efficiency-badge.heating {
    background: rgba(255, 136, 0, 0.2);
    color: var(--accent-warm);
}

.efficiency-badge.cooling {
    background: rgba(0, 170, 255, 0.2);
    color: var(--accent-cold);
}

/* Charts Section */
.charts-section {
    margin-bottom: 40px;
    animation: fadeInUp 0.6s ease-out 0.4s both;
}

.chart-controls {
    display: flex;
    gap: 10px;
    margin-bottom: 25px;
    justify-content: center;
}

.time-btn {
    padding: 10px 20px;
    background: var(--bg-card);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 12px;
    color: var(--text-secondary);
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s;
}

.time-btn:hover {
    border-color: var(--accent-cold);
    color: var(--text-primary);
}

.time-btn.active {
    background: linear-gradient(135deg, var(--accent-cold), var(--accent-warm));
    border-color: transparent;
    color: #000;
    font-weight: 600;
}

.chart-container {
    background: var(--bg-card);
    border-radius: 20px;
    padding: 25px;
    margin-bottom: 20px;
    border: 1px solid rgba(255,255,255,0.05);
}

.chart-container h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 10px;
}

.chart-container h3::before {
    content: '';
    width: 4px;
    height: 20px;
    background: linear-gradient(180deg, var(--accent-cold), var(--accent-warm));
    border-radius: 2px;
}

.chart-container canvas {
    height: 250px !important;
}

/* Stats Section */
.stats-section {
    animation: fadeInUp 0.6s ease-out 0.6s both;
}

.stats-section h3 {
    font-size: 1.2rem;
    margin-bottom: 20px;
    color: var(--text-secondary);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
}

.stat-card {
    background: var(--bg-card);
    border-radius: 16px;
    padding: 20px;
    border: 1px solid rgba(255,255,255,0.05);
    transition: all 0.3s;
}

.stat-card:hover {
    border-color: rgba(255,255,255,0.1);
    transform: translateY(-2px);
}

.stat-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 8px;
}

.stat-value {
    font-size: 1.4rem;
    font-weight: 600;
    font-family: 'SF Mono', monospace;
    background: linear-gradient(135deg, var(--accent-cold), var(--accent-warm));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Responsive */
@media (max-width: 900px) {
    .main-display {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .diff-display {
        order: -1;
    }

    .sensor-temp {
        font-size: 2.5rem;
    }
}

@media (max-width: 600px) {
    .container {
        padding: 15px;
    }

    header {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }

    .chart-controls {
        flex-wrap: wrap;
    }

    .time-btn {
        padding: 8px 15px;
        font-size: 0.8rem;
    }
}