:root {
    --bg: #0f172a;
    --surface: #1e293b;
    --surface-hover: #334155;
    --text: #f1f5f9;
    --muted: #94a3b8;
    --accent: #38bdf8;
    --accent2: #a78bfa;
    --danger: #f87171;
    --success: #34d399;
    --warning: #fbbf24;
    --radius: 12px;
}

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

body {
    font-family: "Segoe UI", system-ui, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 24px;
}

header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
}

h1 {
    font-size: 1.75rem;
}

.status {
    padding: 6px 14px;
    border-radius: 999px;
    background: var(--surface);
    font-size: 0.875rem;
    font-weight: 600;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.compact-toggle {
    background: var(--accent2);
    color: #0f172a;
    border-radius: 999px;
    padding: 8px 14px;
    font-size: 0.85rem;
    border: none;
    cursor: pointer;
}

.compact-toggle:hover {
    opacity: 0.95;
}

.controls {
    display: grid;
    grid-template-columns: repeat(2, minmax(180px, 1fr));
    gap: 12px;
    align-items: end;
    background: var(--surface);
    padding: 16px;
    border-radius: var(--radius);
    margin-bottom: 24px;
}

.button-group {
    display: flex;
    gap: 10px;
    align-items: center;
    justify-content: flex-start;
    grid-column: span 2;
}

.controls label {
    display: flex;
    flex-direction: column;
    gap: 6px;
    font-size: 0.8rem;
    color: var(--muted);
    width: 100%;
}

.controls input {
    padding: 10px 12px;
    border-radius: 8px;
    border: 1px solid #334155;
    background: #0f172a;
    color: var(--text);
    font-size: 0.95rem;
}

#connectBtn {
    background: var(--success);
    color: #0f172a;
}

#disconnectBtn {
    background: var(--danger);
    color: #0f172a;
}

button {
    padding: 10px 18px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition:
        transform 0.1s,
        opacity 0.2s;
}

button:active {
    transform: scale(0.97);
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.topics {
    margin-bottom: 24px;
    background: var(--surface);
    padding: 16px;
    border-radius: var(--radius);
}

.topics-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.topics h2 {
    font-size: 1.1rem;
    color: var(--muted);
}

.topic-editor {
    display: flex;
    gap: 8px;
    margin-bottom: 14px;
}

.topic-editor input {
    flex: 1;
    padding: 10px 12px;
    border-radius: 8px;
    border: 1px solid #334155;
    background: #0f172a;
    color: var(--text);
    font-size: 0.9rem;
}

#addTopicBtn {
    background: var(--accent2);
    color: #0f172a;
}

.topic-tags {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.tag {
    background: #0f172a;
    padding: 6px 10px 6px 14px;
    border-radius: 999px;
    font-size: 0.85rem;
    color: var(--accent);
    font-family: ui-monospace, monospace;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    border: 1px solid #334155;
}

.tag-remove {
    background: transparent;
    color: var(--muted);
    border: none;
    padding: 0 4px;
    font-size: 1rem;
    line-height: 1;
    cursor: pointer;
    border-radius: 4px;
}

.tag-remove:hover {
    color: var(--danger);
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 16px;
    margin-bottom: 32px;
}

.card {
    background: var(--surface);
    border-radius: var(--radius);
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    border: 1px solid #334155;
    transition: border-color 0.2s;
}

.card:hover {
    border-color: var(--accent);
}

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

.card-header h3 {
    font-size: 1.1rem;
    color: var(--accent2);
}

.sensor-id {
    font-size: 0.75rem;
    color: var(--muted);
    background: #0f172a;
    padding: 2px 8px;
    border-radius: 999px;
}

.metric {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
}

.metric-label {
    font-size: 0.85rem;
    color: var(--muted);
}

.metric-value {
    font-size: 1.5rem;
    font-weight: 700;
}

.metric-unit {
    font-size: 0.8rem;
    color: var(--muted);
    margin-left: 4px;
}

.battery-bar {
    height: 6px;
    background: #0f172a;
    border-radius: 999px;
    overflow: hidden;
    margin-top: 4px;
}

.battery-fill {
    height: 100%;
    border-radius: 999px;
    transition:
        width 0.5s ease,
        background 0.5s ease;
}

.temp {
    color: var(--danger);
}
.hum {
    color: var(--accent);
}
.bat {
    color: var(--success);
}
.prox {
    color: var(--warning);
}
.pres {
    color: var(--text);
}
.alt {
    color: var(--text);
}

.last-seen {
    font-size: 0.75rem;
    color: var(--muted);
    margin-top: auto;
    padding-top: 8px;
    border-top: 1px solid #334155;
}

.log {
    background: var(--surface);
    border-radius: var(--radius);
    padding: 16px;
}

.log h2 {
    font-size: 1.1rem;
    margin-bottom: 10px;
    color: var(--muted);
}

#mqttLog {
    list-style: none;
    max-height: 260px;
    overflow-y: auto;
    font-family: ui-monospace, monospace;
    font-size: 0.8rem;
}

#mqttLog li {
    padding: 4px 0;
    border-bottom: 1px solid #334155;
    display: flex;
    gap: 10px;
}

#mqttLog .time {
    color: var(--muted);
    min-width: 60px;
}
#mqttLog .topic {
    color: var(--accent);
    min-width: 180px;
}
#mqttLog .payload {
    color: var(--text);
}

@keyframes pulse {
    0%,
    100% {
        opacity: 1;
    }
    50% {
        opacity: 0.6;
    }
}

.updating {
    animation: pulse 0.8s ease infinite;
}

/* ── Graphs Section ──────────────────────────────────────── */
.graphs-section {
    margin-bottom: 32px;
}

.graphs-section > h2 {
    font-size: 1.3rem;
    margin-bottom: 16px;
    color: var(--text);
    display: flex;
    align-items: center;
    gap: 8px;
}

.graph-window-label {
    font-size: 0.8rem;
    color: var(--muted);
    font-weight: 400;
}

.graphs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
    gap: 16px;
}

.graph-card {
    background: var(--surface);
    border-radius: var(--radius);
    padding: 16px 18px;
    border: 1px solid #334155;
    transition:
        border-color 0.2s,
        box-shadow 0.3s;
}

.graph-card:hover {
    border-color: var(--accent);
    box-shadow: 0 0 18px rgba(56, 189, 248, 0.08);
}

.graph-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.graph-card-header h3 {
    font-size: 0.95rem;
    color: var(--accent2);
    font-weight: 600;
}

.graph-card-header .graph-sensor-id {
    font-size: 0.7rem;
    color: var(--muted);
    background: #0f172a;
    padding: 2px 8px;
    border-radius: 999px;
}

.graph-card canvas {
    width: 100% !important;
    height: 180px !important;
}