:root {
    --bg-color: #030712;
    --card-bg: rgba(17, 24, 39, 0.65);
    --card-border: rgba(255, 255, 255, 0.08);
    --text-main: #f9fafb;
    --text-muted: #9ca3af;
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    
    --ch1-color: #06b6d4; /* Neon Cyan */
    --ch2-color: #10b981; /* Neon Emerald */
    --ch3-color: #8b5cf6; /* Neon Purple */
    --ch4-color: #f59e0b; /* Neon Amber */
    --temp-color: #f43f5e; /* Neon Rose */
}

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

body {
    font-family: 'Outfit', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    min-height: 100vh;
    padding: 2rem 1rem;
    display: flex;
    justify-content: center;
    position: relative;
    overflow-x: hidden;
}

.background-glow {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: 
        radial-gradient(circle at 15% 15%, rgba(99, 102, 241, 0.12) 0%, transparent 45%),
        radial-gradient(circle at 85% 85%, rgba(6, 182, 212, 0.10) 0%, transparent 45%),
        radial-gradient(circle at 50% 50%, rgba(139, 92, 246, 0.05) 0%, transparent 60%);
    pointer-events: none;
    z-index: -1;
}

.container {
    width: 100%;
    max-width: 1240px;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* HEADER */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0.25rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.logo-section {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
}

.logo-badge {
    align-self: flex-start;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.2), rgba(6, 182, 212, 0.2));
    border: 1px solid rgba(99, 102, 241, 0.4);
    color: #a5b4fc;
    font-size: 0.6875rem;
    font-weight: 800;
    letter-spacing: 1.5px;
    padding: 0.15rem 0.5rem;
    border-radius: 6px;
    margin-bottom: 0.2rem;
}

.logo-section h1 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 2.2rem;
    font-weight: 700;
    background: linear-gradient(135deg, #a5b4fc, #818cf8, #06b6d4);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.5px;
    line-height: 1;
}

.logo-section p {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.header-right {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.device-badge {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--card-border);
    padding: 0.5rem 0.85rem;
    border-radius: 14px;
    backdrop-filter: blur(12px);
    font-size: 0.875rem;
}

.device-label {
    font-size: 0.6875rem;
    font-weight: 700;
    color: var(--text-muted);
    letter-spacing: 1px;
}

.device-sn {
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 700;
    color: #a5b4fc;
    letter-spacing: 0.5px;
}

.btn-icon {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.25rem;
    border-radius: 6px;
    transition: all 0.2s;
}

.btn-icon:hover {
    color: white;
    background: rgba(255, 255, 255, 0.1);
}

.status-badge {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--card-border);
    padding: 0.55rem 1rem;
    border-radius: 9999px;
    font-size: 0.875rem;
    font-weight: 600;
    backdrop-filter: blur(12px);
}

.pulse-dot {
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background-color: #ef4444;
}

.pulse-dot.online {
    background-color: #10b981;
    box-shadow: 0 0 12px #10b981;
    animation: pulse 2s infinite;
}

.pulse-dot.connecting {
    background-color: #f59e0b;
    box-shadow: 0 0 12px #f59e0b;
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0% { transform: scale(0.95); opacity: 0.8; }
    50% { transform: scale(1.15); opacity: 1; }
    100% { transform: scale(0.95); opacity: 0.8; }
}

/* SUMMARY BAR (FIRST ROW WIDGETS) */
.summary-bar {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.25rem;
    margin-bottom: 2rem;
}

.summary-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    padding: 1.1rem 1.25rem;
    backdrop-filter: blur(16px);
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.summary-title {
    font-size: 0.6875rem;
    font-weight: 700;
    letter-spacing: 1px;
    color: var(--text-muted);
}

.summary-value {
    display: flex;
    align-items: baseline;
    gap: 0.35rem;
}

.summary-value.small-text {
    font-size: 0.875rem;
    font-weight: 600;
    color: #a5b4fc;
    word-break: break-all;
}

.num-highlight {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.75rem;
    font-weight: 700;
    color: white;
}

.device-status-tag {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.15rem;
    font-weight: 700;
    padding: 0.2rem 0.75rem;
    border-radius: 8px;
    letter-spacing: 1px;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    transition: all 0.3s ease;
}

.device-status-tag.online {
    background: rgba(16, 185, 129, 0.15);
    color: #10b981;
    border: 1px solid rgba(16, 185, 129, 0.4);
    box-shadow: 0 0 12px rgba(16, 185, 129, 0.25);
}

.device-status-tag.offline {
    background: rgba(239, 68, 68, 0.15);
    color: #ef4444;
    border: 1px solid rgba(239, 68, 68, 0.4);
}

.device-status-tag.connecting {
    background: rgba(245, 158, 11, 0.15);
    color: #f59e0b;
    border: 1px solid rgba(245, 158, 11, 0.4);
}

.last-seen-text {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 0.1rem;
}

/* DASHBOARD SENSOR GRID */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
    gap: 1.25rem;
}

.card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 20px;
    padding: 1.4rem;
    backdrop-filter: blur(16px);
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.25);
    transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
}

.card.ch1::before { background: var(--ch1-color); }
.card.ch2::before { background: var(--ch2-color); }
.card.ch3::before { background: var(--ch3-color); }
.card.ch4::before { background: var(--ch4-color); }
.card.temp-card::before { background: var(--temp-color); }

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 14px 40px 0 rgba(0, 0, 0, 0.4);
}

.card.ch1:hover { border-color: rgba(6, 182, 212, 0.35); }
.card.ch2:hover { border-color: rgba(16, 185, 129, 0.35); }
.card.ch3:hover { border-color: rgba(139, 92, 246, 0.35); }
.card.ch4:hover { border-color: rgba(245, 158, 11, 0.35); }
.card.temp-card:hover { border-color: rgba(244, 63, 94, 0.35); }

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.card-title {
    font-size: 0.8125rem;
    text-transform: uppercase;
    letter-spacing: 1.2px;
    color: var(--text-muted);
    font-weight: 700;
}

.sensor-icon { opacity: 0.75; }
.card.ch1 .sensor-icon { fill: var(--ch1-color); }
.card.ch2 .sensor-icon { fill: var(--ch2-color); }
.card.ch3 .sensor-icon { fill: var(--ch3-color); }
.card.ch4 .sensor-icon { fill: var(--ch4-color); }
.card.temp-card .sensor-icon { fill: var(--temp-color); }

.value-display {
    display: flex;
    align-items: baseline;
    gap: 0.25rem;
    margin-bottom: 1rem;
}

.value-display.dual-value {
    justify-content: space-between;
}

.value-display .primary-value {
    display: flex;
    align-items: baseline;
    gap: 0.25rem;
}

.value-display .secondary-value {
    display: flex;
    align-items: baseline;
    gap: 0.15rem;
    opacity: 0.9;
}

.value-display .number {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 2.75rem;
    font-weight: 700;
    line-height: 1;
}

.value-display .amp-number {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.4rem;
    font-weight: 700;
}

.card.ch1 .number { text-shadow: 0 0 15px rgba(6, 182, 212, 0.3); }
.card.ch2 .number { text-shadow: 0 0 15px rgba(16, 185, 129, 0.3); }
.card.ch3 .number { text-shadow: 0 0 15px rgba(139, 92, 246, 0.3); }
.card.ch4 .number { text-shadow: 0 0 15px rgba(245, 158, 11, 0.3); }
.card.temp-card .number { text-shadow: 0 0 15px rgba(244, 63, 94, 0.3); }

.unit {
    font-size: 1.1rem;
    color: var(--text-muted);
    font-weight: 500;
}

.gauge-container {
    width: 100%;
    height: 6px;
    background: rgba(255, 255, 255, 0.06);
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: 0.85rem;
}

.gauge-bar {
    height: 100%;
    width: 0%;
    border-radius: 3px;
    transition: width 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.card.ch1 .gauge-bar { background: var(--ch1-color); }
.card.ch2 .gauge-bar { background: var(--ch2-color); }
.card.ch3 .gauge-bar { background: var(--ch3-color); }
.card.ch4 .gauge-bar { background: var(--ch4-color); }
.card.temp-card .gauge-bar { background: var(--temp-color); }

.stats-footer {
    display: flex;
    justify-content: center;
    font-size: 0.8125rem;
    color: var(--text-muted);
}

.stats-footer strong {
    color: var(--text-main);
    font-family: 'Space Grotesk', sans-serif;
}

/* CHART CARD */
.chart-card {
    margin-top: 2.25rem;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.chart-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.chart-title h3 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.25rem;
    font-weight: 700;
}

.chart-title p {
    font-size: 0.8125rem;
    color: var(--text-muted);
    margin-top: 0.15rem;
}

.chart-legend {
    display: flex;
    gap: 1rem;
    font-size: 0.8125rem;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    color: var(--text-muted);
    font-weight: 500;
}

.legend-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
}

.legend-dot.ch1 { background: var(--ch1-color); }
.legend-dot.ch2 { background: var(--ch2-color); }
.legend-dot.ch3 { background: var(--ch3-color); }
.legend-dot.ch4 { background: var(--ch4-color); }

.canvas-wrapper {
    position: relative;
    width: 100%;
    height: 280px;
}

/* SERIAL SELECTION MODAL */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(3, 7, 18, 0.85);
    backdrop-filter: blur(12px);
    z-index: 100;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 1rem;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal-card {
    background: #0f172a;
    border: 1px solid var(--card-border);
    border-radius: 24px;
    padding: 2.25rem;
    max-width: 480px;
    width: 100%;
    box-shadow: 0 25px 60px rgba(0, 0, 0, 0.6);
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.modal-header h2 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.4rem;
    font-weight: 700;
}

.modal-header p {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-top: 0.4rem;
    line-height: 1.4;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-size: 0.8125rem;
    font-weight: 700;
    color: var(--text-muted);
    letter-spacing: 0.5px;
}

.form-group input {
    width: 100%;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    padding: 0.85rem 1rem;
    color: var(--text-main);
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1rem;
    outline: none;
    transition: border-color 0.2s;
}

.form-group input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.25);
}

.input-hint {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.input-hint code {
    color: #a5b4fc;
}

.modal-actions {
    margin-top: 0.5rem;
}

.btn {
    width: 100%;
    background: linear-gradient(135deg, #6366f1, #4f46e5);
    color: white;
    border: none;
    border-radius: 12px;
    padding: 0.85rem 1.5rem;
    font-family: inherit;
    font-size: 0.9375rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: 0 4px 14px rgba(99, 102, 241, 0.35);
}

.btn:hover {
    background: linear-gradient(135deg, #818cf8, #6366f1);
    transform: translateY(-1px);
    box-shadow: 0 6px 18px rgba(99, 102, 241, 0.5);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid var(--card-border);
    color: var(--text-main);
    box-shadow: none;
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.12);
    box-shadow: none;
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.8125rem;
}

.demo-section {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    padding-top: 1rem;
}

.demo-label {
    font-size: 0.6875rem;
    font-weight: 700;
    color: var(--text-muted);
    letter-spacing: 1px;
}

/* RESPONSIVE */
@media (max-width: 680px) {
    header {
        flex-direction: column;
        align-items: stretch;
    }
    .header-right {
        justify-content: space-between;
    }
}