:root {
    --bg-main: #0B0F19;
    --bg-card: rgba(22, 30, 49, 0.75);
    --bg-card-hover: rgba(30, 41, 67, 0.85);
    --border-color: rgba(255, 255, 255, 0.08);
    --primary: #3B82F6;
    --primary-glow: rgba(59, 130, 246, 0.4);
    --accent-temp: #F97316;
    --accent-hum: #06B6D4;
    --accent-battery: #10B981;
    --text-primary: #F3F4F6;
    --text-secondary: #9CA3AF;
    --text-muted: #6B7280;
    --radius-lg: 16px;
    --radius-md: 12px;
    --radius-sm: 8px;
    --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

body {
    background-color: var(--bg-main);
    background-image: 
        radial-gradient(at 10% 10%, rgba(59, 130, 246, 0.12) 0px, transparent 50%),
        radial-gradient(at 90% 90%, rgba(6, 182, 212, 0.08) 0px, transparent 50%);
    color: var(--text-primary);
    min-height: 100vh;
    padding: 24px;
    display: flex;
    justify-content: center;
}

.app-container {
    width: 100%;
    max-width: 1320px;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

/* Navigation Header */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 24px;
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

.logo-group {
    display: flex;
    align-items: center;
    gap: 12px;
}

.icon-badge {
    font-size: 24px;
    background: rgba(59, 130, 246, 0.15);
    padding: 8px 12px;
    border-radius: var(--radius-md);
    border: 1px solid rgba(59, 130, 246, 0.3);
}

h1 {
    font-size: 18px;
    font-weight: 700;
    color: #FFFFFF;
}

/* Nav Tabs */
.nav-tabs {
    display: flex;
    gap: 8px;
    background: rgba(15, 23, 42, 0.6);
    padding: 4px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.nav-tab {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 10px 20px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.nav-tab.active {
    background: var(--primary) !important;
    color: #FFFFFF !important;
    box-shadow: 0 4px 14px var(--primary-glow);
}

.nav-tab:hover:not(.active) {
    background: rgba(255, 255, 255, 0.06);
    color: #FFFFFF;
}

.tab-icon {
    font-size: 16px;
}

.status-pill {
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.25);
    padding: 8px 14px;
    border-radius: 20px;
    font-size: 13px;
    color: #34D399;
}

.status-dot {
    width: 8px;
    height: 8px;
    background: #10B981;
    border-radius: 50%;
    box-shadow: 0 0 10px #10B981;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.2); }
}

/* Tab Content */
.tab-content {
    display: none;
    flex-direction: column;
    gap: 24px;
}

.tab-content.active {
    display: flex !important;
}

/* Dynamic Stats Summary Container */
.stats-container {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.stats-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.stats-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--primary);
    background: rgba(59, 130, 246, 0.1);
    padding: 6px 14px;
    border-radius: 20px;
    border: 1px solid rgba(59, 130, 246, 0.2);
}

.btn-reset-filter {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    font-size: 12px;
    cursor: pointer;
    transition: var(--transition);
}

.btn-reset-filter:hover {
    background: rgba(255, 255, 255, 0.15);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 16px;
}

.stat-card {
    background: rgba(15, 23, 42, 0.5);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 16px;
    display: flex;
    align-items: center;
    gap: 14px;
    transition: var(--transition);
}

.stat-card:hover {
    border-color: rgba(255, 255, 255, 0.15);
    transform: translateY(-2px);
}

.stat-icon {
    font-size: 22px;
    padding: 10px;
    border-radius: var(--radius-md);
}

.temp-icon { background: rgba(249, 115, 22, 0.15); }
.hum-icon { background: rgba(6, 182, 212, 0.15); }
.min-icon { background: rgba(59, 130, 246, 0.15); }
.max-icon { background: rgba(239, 68, 68, 0.15); }

.stat-content {
    display: flex;
    flex-direction: column;
}

.stat-label {
    font-size: 11px;
    color: var(--text-secondary);
    font-weight: 500;
}

.stat-value {
    font-size: 20px;
    font-weight: 700;
    color: #FFFFFF;
    margin-top: 2px;
}

/* Sensors Grid */
.section-container {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.sensors-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 20px;
}

/* Interactive Sensor Card */
.sensor-card {
    background: rgba(15, 23, 42, 0.6);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    cursor: pointer;
    transition: var(--transition);
}

.sensor-card:hover {
    border-color: rgba(59, 130, 246, 0.6);
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.sensor-card.selected-card {
    border-color: var(--primary) !important;
    background: rgba(59, 130, 246, 0.15) !important;
    box-shadow: 0 0 25px var(--primary-glow) !important;
}

.sensor-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.sensor-name-group {
    display: flex;
    align-items: center;
    gap: 10px;
}

.sensor-icon {
    font-size: 22px;
}

.sensor-title {
    font-size: 16px;
    font-weight: 600;
    color: #FFFFFF;
}

.sensor-mac {
    font-size: 11px;
    color: var(--text-muted);
}

.battery-tag {
    font-size: 12px;
    font-weight: 600;
    color: #10B981;
    background: rgba(16, 185, 129, 0.12);
    padding: 4px 10px;
    border-radius: 12px;
}

.sensor-values {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.val-box {
    background: rgba(255, 255, 255, 0.03);
    padding: 12px;
    border-radius: var(--radius-sm);
    display: flex;
    flex-direction: column;
}

.val-label {
    font-size: 11px;
    color: var(--text-secondary);
}

.val-num {
    font-size: 24px;
    font-weight: 700;
    margin-top: 4px;
}

.temp-num { color: var(--accent-temp); }
.hum-num { color: var(--accent-hum); }

.sensor-footer {
    font-size: 11px;
    color: var(--text-muted);
    display: flex;
    justify-content: space-between;
    border-top: 1px solid var(--border-color);
    padding-top: 10px;
}

/* History Chart Controls */
.chart-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
    margin-bottom: 24px;
}

.chart-title-group {
    display: flex;
    align-items: center;
    gap: 12px;
}

.selector-label {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}

.custom-select {
    background: #1E293B;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 8px 16px;
    border-radius: var(--radius-md);
    font-size: 14px;
    outline: none;
    cursor: pointer;
    font-weight: 500;
}

.time-controls {
    display: flex;
    gap: 6px;
    background: #1E293B;
    padding: 4px;
    border-radius: var(--radius-md);
    flex-wrap: wrap;
}

.time-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 8px 14px;
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.time-btn.active, .time-btn:hover {
    background: var(--primary);
    color: #FFFFFF;
}

.chart-wrapper {
    position: relative;
    height: 480px;
    width: 100%;
}