/* ═══════════════════════════════════════════════════════
   Material Design 3 – Smart Campus Digital Twin
   ═══════════════════════════════════════════════════════ */

/* ── MD3 Color Tokens ── */
:root {
    /* Primary – deep forest green */
    --md-primary:               #006B54;
    --md-on-primary:            #FFFFFF;
    --md-primary-container:     #83F8D5;
    --md-on-primary-container:  #002117;

    /* Secondary */
    --md-secondary:             #4C6359;
    --md-on-secondary:          #FFFFFF;
    --md-secondary-container:   #CFE9DF;
    --md-on-secondary-container:#092019;

    /* Tertiary – warm amber accent */
    --md-tertiary:              #7B5800;
    --md-on-tertiary:           #FFFFFF;
    --md-tertiary-container:    #FFDD9E;
    --md-on-tertiary-container: #261A00;

    /* Surface */
    --md-surface:               #F6FAF7;
    --md-on-surface:            #191C1B;
    --md-surface-variant:       #DBE5DE;
    --md-on-surface-variant:    #3F4946;

    /* Outline */
    --md-outline:               #6F7973;
    --md-outline-variant:       #BEC9C3;

    /* Inverse */
    --md-inverse-surface:       #2D312F;
    --md-inverse-on-surface:    #EEF1EE;

    /* Elevation overlays (tinted surface) */
    --md-surface-1: color-mix(in srgb, var(--md-primary) 5%,  var(--md-surface));
    --md-surface-2: color-mix(in srgb, var(--md-primary) 8%,  var(--md-surface));
    --md-surface-3: color-mix(in srgb, var(--md-primary) 11%, var(--md-surface));

    /* Elevation shadows */
    --md-elev-1: 0 1px 2px rgba(0,0,0,.30), 0 1px 3px 1px rgba(0,0,0,.15);
    --md-elev-2: 0 1px 2px rgba(0,0,0,.30), 0 2px 6px 2px rgba(0,0,0,.15);
    --md-elev-3: 0 4px 8px 3px rgba(0,0,0,.15), 0 1px 3px rgba(0,0,0,.30);
    --md-elev-4: 0 6px 10px 4px rgba(0,0,0,.15), 0 2px 3px rgba(0,0,0,.30);

    /* Legacy compat aliases */
    --bg:           var(--md-surface);
    --text:         var(--md-on-surface);
    --muted:        var(--md-on-surface-variant);
    --accent:       var(--md-tertiary);
    --accent-soft:  var(--md-tertiary-container);
    --sensor:       #3fa6ff;
    --shadow:       var(--md-elev-3);
    --panel:        rgba(246, 250, 247, 0.92);
    --panel-border: var(--md-outline-variant);
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    min-height: 100%;
    font-family: "Roboto", "Segoe UI", system-ui, sans-serif;
    color: var(--md-on-surface);
    background: var(--md-surface);
}

body {
    display: flex;
    flex-direction: column;
    overflow: hidden;
    height: 100vh;
}

body.mobile-blocked {
    display: block;
    overflow: auto;
    height: auto;
    min-height: 100vh;
    background:
        radial-gradient(circle at top left, rgba(131, 248, 213, 0.18), transparent 30%),
        linear-gradient(145deg, #e8f5ee 0%, #d4eadc 45%, #b8d6c4 100%);
}

body.mobile-blocked .top-app-bar,
body.mobile-blocked #app-shell,
body.mobile-blocked .sensor-modal-backdrop {
    display: none !important;
}

.mobile-blocked.hidden {
    display: none;
}

.mobile-blocked {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 24px;
}

.mobile-blocked-card {
    width: min(100%, 420px);
    padding: 28px 24px;
    border: 1px solid var(--panel-border);
    border-radius: 24px;
    background: rgba(246, 250, 247, 0.94);
    box-shadow: var(--md-elev-3);
    text-align: center;
}

.mobile-blocked-eyebrow {
    margin: 0 0 10px;
    color: var(--md-primary);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.mobile-blocked-card h1 {
    margin: 0 0 12px;
    font-family: "Google Sans", "Roboto", sans-serif;
    font-size: 1.55rem;
    line-height: 1.2;
}

.mobile-blocked-card p:last-child {
    margin: 0;
    color: var(--md-on-surface-variant);
    line-height: 1.55;
}

/* ════════════════════════════════════════════════════════
   TOP APP BAR (Navbar)
   ════════════════════════════════════════════════════════ */
.top-app-bar {
    position: relative;
    z-index: 100;
    flex-shrink: 0;
    height: 64px;
    background: color-mix(in srgb, var(--md-primary) 8%, white 92%);
    backdrop-filter: blur(20px) saturate(1.4);
    -webkit-backdrop-filter: blur(20px) saturate(1.4);
    border-bottom: 1px solid var(--md-outline-variant);
    box-shadow: var(--md-elev-1);
}

.nav-inner {
    display: flex;
    align-items: center;
    height: 100%;
    max-width: 1600px;
    margin: 0 auto;
    padding: 0 24px;
    gap: 32px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: inherit;
    flex-shrink: 0;
    cursor: pointer;
}

.nav-logo {
    width: 28px;
    height: 28px;
    color: var(--md-primary);
    flex-shrink: 0;
}

.nav-title {
    font-family: "Google Sans", "Roboto", sans-serif;
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--md-on-surface);
    letter-spacing: -0.01em;
}

.nav-badge {
    font-size: 0.68rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--md-on-primary);
    background: var(--md-primary);
    padding: 3px 8px;
    border-radius: 999px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 4px;
    flex: 1;
}

.nav-link {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--md-on-surface-variant);
    text-decoration: none;
    padding: 8px 14px;
    border-radius: 999px;
    transition: background 150ms ease, color 150ms ease;
}

.nav-link:hover {
    background: color-mix(in srgb, var(--md-primary) 8%, transparent);
    color: var(--md-primary);
}

.nav-link.active {
    background: var(--md-secondary-container);
    color: var(--md-on-secondary-container);
}

.nav-cta {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
    font-family: "Google Sans", "Roboto", sans-serif;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--md-on-primary);
    background: var(--md-primary);
    border: none;
    border-radius: 999px;
    padding: 10px 20px;
    cursor: pointer;
    box-shadow: var(--md-elev-1);
    transition: box-shadow 200ms ease, background 200ms ease, transform 120ms ease;
}

.nav-cta:hover {
    background: color-mix(in srgb, var(--md-primary) 88%, black);
    box-shadow: var(--md-elev-2);
    transform: translateY(-1px);
}

.nav-cta:active {
    transform: translateY(0);
    box-shadow: var(--md-elev-1);
}

/* ════════════════════════════════════════════════════════
   APP SHELL GRID
   ════════════════════════════════════════════════════════ */
#app-shell {
    display: grid;
    /* sensor panel visible: left panel hidden, scene | sensor */
    grid-template-columns: minmax(0, 1fr) 320px;
    flex: 1;
    min-height: 0;
    gap: 16px;
    padding: 16px;
    background:
        radial-gradient(circle at top left, rgba(131, 248, 213, 0.18), transparent 30%),
        linear-gradient(145deg, #e8f5ee 0%, #d4eadc 45%, #b8d6c4 100%);
}

/* sensor panel visible → hide left panel by default */
#app-shell .panel-left { display: none; }

/* toggle button hidden by default */
.panel-left-toggle { display: none; }

#app-shell.sensor-panel-hidden {
    /* in 3D view with no selection: left panel | scene */
    grid-template-columns: 320px minmax(0, 1fr);
}

/* sensor panel hidden → show left panel, hide toggle */
#app-shell.sensor-panel-hidden .panel-left { display: block; }

/* sensor panel visible → show toggle arrow on left edge of scene */
#app-shell:not(.sensor-panel-hidden):not(.intro-active) .panel-left-toggle {
    display: flex;
}

/* both panels open: left panel | scene | sensor panel */
#app-shell.left-panel-open {
    grid-template-columns: 320px minmax(0, 1fr) 320px;
}
#app-shell.left-panel-open .panel-left { display: block; }
#app-shell.left-panel-open .panel-left-toggle { display: none; }

/* landing overlay: scene only, left panel hidden */
#app-shell.intro-active,
#app-shell.intro-active.sensor-panel-hidden {
    grid-template-columns: minmax(0, 1fr);
}
#app-shell.intro-active .panel-left { display: none; }

/* ── Toggle button style ── */
.panel-left-toggle {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 10;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 48px;
    border: 1px solid var(--panel-border);
    border-radius: 0 12px 12px 0;
    background: var(--panel);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    box-shadow: var(--md-elev-2);
    cursor: pointer;
    color: var(--md-on-surface);
    transition: background 150ms ease;
}
.panel-left-toggle:hover { background: rgba(255,255,255,0.9); }

/* ════════════════════════════════════════════════════════
   MD3 PANELS (elevated surface cards)
   ════════════════════════════════════════════════════════ */
.panel {
    background: var(--panel);
    border: 1px solid var(--panel-border);
    border-radius: 20px;
    box-shadow: var(--md-elev-2);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
}

.panel-left,
.panel-right {
    padding: 24px;
    overflow: auto;
}

.panel-right.hidden { display: none; }

.panel-overlay {
    position: absolute;
    right: 16px;
    bottom: 16px;
    padding: 14px 16px;
    min-width: 168px;
    font-size: 0.85rem;
}

/* ── Loading overlay ── */
.loading-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: rgba(20, 24, 32, 0.72);
    z-index: 200;
    border-radius: 24px;
    transition: opacity 0.4s ease;
}
.loading-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}
.loading-spinner {
    width: 48px;
    height: 48px;
    border: 4px solid rgba(255,255,255,.15);
    border-top-color: var(--md-primary-container);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.loading-text {
    margin-top: 14px;
    color: #ccd6e0;
    font-size: 0.95rem;
    letter-spacing: 0.02em;
}

/* ── Floor badge ── */
.scene-floor-badge {
    position: absolute;
    left: 16px;
    top: 16px;
    z-index: 2;
    padding: 10px 16px;
    border-radius: 999px;
    background: rgba(0, 33, 23, 0.86);
    color: #fff;
    font-size: 0.88rem;
    letter-spacing: 0.02em;
    backdrop-filter: blur(6px);
    box-shadow: var(--md-elev-2);
}
.scene-badge-hidden { display: none; }

/* ── Scene root ── */
#scene-root {
    position: relative;
    min-width: 0;
    border-radius: 24px;
    overflow: hidden;
    box-shadow: var(--md-elev-3);
    min-height: 0;
}

#scene {
    display: block;
    width: 100%;
    height: 100%;
    background: linear-gradient(180deg, #dceaf4 0%, #f0ece3 100%);
}

/* ════════════════════════════════════════════════════════
   INTRO / LANDING OVERLAY
   ════════════════════════════════════════════════════════ */
.intro-overlay {
    position: absolute;
    inset: 0;
    z-index: 3;
    display: flex;
    flex-direction: column;
    transition: opacity 250ms ease, visibility 250ms ease;
}

.intro-overlay.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

/* ── Zoomable image stage ── */
.intro-stage {
    position: absolute;
    inset: 0;
    overflow: hidden;
    touch-action: none;
}

.intro-media {
    position: absolute;
    inset: 0;
    transform-origin: center center;
}

.intro-image {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

/* ── Hotspots ── */
.intro-hotspots {
    position: absolute;
    inset: 0;
}

.intro-hotspot {
    position: absolute;
    transform: translate(-50%, -50%);
    border: 0;
    background: transparent;
    cursor: pointer;
    padding: 0;
}

.intro-hotspot::before {
    content: "";
    display: block;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--md-tertiary);
    border: 3px solid rgba(255,255,255,.92);
    box-shadow: 0 0 0 10px color-mix(in srgb, var(--md-tertiary) 20%, transparent);
    animation: hotspotPulse 2s infinite;
    transition: box-shadow 160ms ease;
}

.intro-hotspot span {
    position: absolute;
    left: 50%;
    top: calc(100% + 10px);
    transform: translateX(-50%);
    white-space: nowrap;
    padding: 6px 14px;
    border-radius: 999px;
    background: rgba(0, 33, 23, 0.88);
    color: #fff;
    font-size: 0.82rem;
    font-weight: 500;
    letter-spacing: 0.04em;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 150ms ease, visibility 150ms ease;
    backdrop-filter: blur(6px);
}

.intro-hotspot:hover::before,
.intro-hotspot:focus-visible::before {
    box-shadow: 0 0 0 16px color-mix(in srgb, var(--md-tertiary) 28%, transparent);
}

.intro-hotspot:hover span,
.intro-hotspot:focus-visible span {
    opacity: 1;
    visibility: visible;
}

.intro-hotspot:focus-visible { outline: none; }

/* ── Gradient scrim ── */
.intro-scrim {
    display: none;
}

/* ── Hero content card ── */
.intro-hero {
    position: absolute;
    bottom: 72px; /* above footer */
    right: 32px;
    max-width: 460px;
    z-index: 2;
    padding: 28px 32px;
    border-radius: 20px;
    background: rgba(246, 250, 247, 0.10);
    border: 1px solid rgba(255, 255, 255, 0.18);
    backdrop-filter: blur(24px) saturate(1.6);
    -webkit-backdrop-filter: blur(24px) saturate(1.6);
    box-shadow: var(--md-elev-3);
    color: #fff;
}

.intro-chip {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.78rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--md-primary-container);
    background: color-mix(in srgb, var(--md-primary) 60%, transparent);
    border: 1px solid color-mix(in srgb, var(--md-primary-container) 40%, transparent);
    padding: 5px 12px;
    border-radius: 999px;
    margin-bottom: 16px;
}

.intro-headline {
    font-family: "Google Sans", "Roboto", sans-serif;
    font-size: 2rem;
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: -0.02em;
    color: #fff;
    margin: 0 0 12px;
}

.intro-body {
    font-size: 0.9rem;
    line-height: 1.6;
    color: rgba(255, 255, 255, 0.78);
    margin: 0 0 20px;
}

.intro-actions {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 14px;
}

/* ── Material buttons ── */
.md-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-family: "Google Sans", "Roboto", sans-serif;
    font-size: 0.9rem;
    font-weight: 500;
    letter-spacing: 0.01em;
    border: none;
    border-radius: 999px;
    padding: 12px 22px;
    cursor: pointer;
    transition: box-shadow 200ms ease, transform 120ms ease, background 160ms ease;
}

.md-btn-filled {
    background: var(--md-primary);
    color: var(--md-on-primary);
    box-shadow: var(--md-elev-1);
}

.md-btn-filled:hover {
    background: color-mix(in srgb, var(--md-primary) 88%, black);
    box-shadow: var(--md-elev-2);
    transform: translateY(-1px);
}

.md-btn-filled:active {
    transform: translateY(0);
    box-shadow: var(--md-elev-1);
}

/* ── Icon button group ── */
.intro-zoom-group {
    display: flex;
    gap: 6px;
}

.md-icon-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 1px solid rgba(255,255,255,.28);
    background: rgba(255,255,255,.12);
    color: #fff;
    cursor: pointer;
    transition: background 150ms ease, transform 120ms ease;
    backdrop-filter: blur(8px);
}

.md-icon-btn:hover {
    background: rgba(255,255,255,.22);
    transform: scale(1.08);
}

.md-icon-btn:active {
    transform: scale(1);
    background: rgba(255,255,255,.30);
}

.intro-hint {
    font-size: 0.78rem;
    color: rgba(255,255,255,.52);
    margin: 0;
    letter-spacing: 0.02em;
}

/* ════════════════════════════════════════════════════════
   LANDING FOOTER (inside intro overlay)
   ════════════════════════════════════════════════════════ */
.landing-footer {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 2;
    height: 52px;
    background: rgba(0, 15, 10, 0.72);
    border-top: 1px solid rgba(255,255,255,.10);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.footer-inner {
    display: flex;
    align-items: center;
    height: 100%;
    padding: 0 24px;
    gap: 24px;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.82rem;
    font-weight: 500;
    color: rgba(255,255,255,.72);
    flex-shrink: 0;
}

.footer-links {
    display: flex;
    align-items: center;
    gap: 4px;
    flex: 1;
}

.footer-link {
    font-size: 0.8rem;
    color: rgba(255,255,255,.50);
    text-decoration: none;
    padding: 4px 10px;
    border-radius: 999px;
    transition: color 150ms ease, background 150ms ease;
}

.footer-link:hover {
    color: rgba(255,255,255,.90);
    background: rgba(255,255,255,.08);
}

.footer-copy {
    font-size: 0.78rem;
    color: rgba(255,255,255,.38);
    flex-shrink: 0;
}

/* ════════════════════════════════════════════════════════
   LEFT / RIGHT PANEL CONTENT
   ════════════════════════════════════════════════════════ */
.eyebrow {
    margin: 0 0 10px;
    text-transform: uppercase;
    letter-spacing: 0.16em;
    font-size: 0.73rem;
    color: var(--md-primary);
    font-weight: 500;
}

h1, h2, p { margin-top: 0; }

h1 {
    font-family: "Google Sans", "Roboto", sans-serif;
    font-size: 1.75rem;
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.02em;
    margin-bottom: 12px;
    color: var(--md-on-surface);
}

h2 {
    font-family: "Google Sans", "Roboto", sans-serif;
    font-size: 1.4rem;
    font-weight: 600;
    line-height: 1.15;
    margin-bottom: 10px;
}

.lead, .muted, .details dd, .panel-overlay p {
    color: var(--md-on-surface-variant);
    font-size: 0.9rem;
    line-height: 1.55;
}

/* ── Mode strip buttons ── */
.mode-strip {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
    margin: 20px 0;
}

.mode-button {
    font-family: "Google Sans", "Roboto", sans-serif;
    font-size: 0.87rem;
    font-weight: 500;
    border: 1px solid var(--md-outline-variant);
    border-radius: 999px;
    padding: 10px 14px;
    background: var(--md-surface-1);
    color: var(--md-on-surface);
    cursor: pointer;
    transition: background 150ms ease, box-shadow 150ms ease, border-color 150ms ease, transform 120ms ease;
}

.mode-button:hover {
    background: var(--md-secondary-container);
    border-color: var(--md-secondary);
    color: var(--md-on-secondary-container);
    transform: translateY(-1px);
}

.mode-button.active,
.mode-button:active {
    background: var(--md-primary);
    border-color: var(--md-primary);
    color: var(--md-on-primary);
    box-shadow: var(--md-elev-1);
    transform: none;
}

/* ── Legend ── */
.buildings-list {
    list-style: none;
    margin: 0 0 20px;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 4px;
    max-height: 280px;
    overflow-y: auto;
}

.buildings-list-empty {
    font-size: 0.83rem;
    color: var(--md-on-surface-variant);
    font-style: italic;
    padding: 6px 0;
}

.building-swatch-btn {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    background: none;
    border: none;
    border-radius: 10px;
    padding: 7px 10px;
    cursor: pointer;
    text-align: left;
    font: inherit;
    font-size: 0.87rem;
    color: var(--md-on-surface);
    transition: background 120ms ease;
}

.building-swatch-btn:hover { background: rgba(0,0,0,0.06); }

.building-swatch-dot {
    flex-shrink: 0;
    width: 12px;
    height: 12px;
    border-radius: 3px;
    background: var(--md-tertiary, #6db87b);
}

.legend {
    list-style: none;
    display: grid;
    gap: 8px;
    margin: 0 0 20px;
    padding: 0;
}

.legend li {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.87rem;
    color: var(--md-on-surface-variant);
}

.swatch {
    display: inline-block;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    flex-shrink: 0;
}

.swatch.campus   { background: #5ca86e; }
.swatch.building { background: var(--md-tertiary); }
.swatch.sensor   { background: var(--sensor); }

/* ── Status grid ── */
.status-grid {
    display: grid;
    gap: 12px;
    padding: 16px;
    border-radius: 16px;
    background: var(--md-surface-2);
    border: 1px solid var(--md-outline-variant);
}

.label, dt {
    display: block;
    font-size: 0.73rem;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--md-primary);
    font-weight: 500;
    margin-bottom: 3px;
}

dd {
    margin: 0;
    font-size: 0.93rem;
    font-weight: 500;
    color: var(--md-on-surface);
}

/* ── Details (sensor panel) ── */
.details {
    display: grid;
    gap: 12px;
    padding: 0;
    margin: 0;
}

#modal-sensor-details {
    grid-template-columns: 1fr 1fr;
}

#modal-sensor-details div:last-child:nth-child(odd) {
    grid-column: 1 / -1;
}

/* ── Floor + sensor list in right panel ── */
.sensors-category-label {
    font-size: 0.78rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--md-on-surface-variant);
    margin: 16px 0 8px;
    padding-bottom: 6px;
    border-bottom: 1px solid var(--panel-border);
}

.sensors-category-future { color: #b06b1a; }

.sensor-row-dot--future {
    background: #d5873b;
    box-shadow: 0 0 0 3px rgba(213, 135, 59, 0.2);
}

.floor-section { margin-bottom: 16px; }

.floor-label {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.09em;
    color: var(--md-on-surface-variant);
    margin: 0 0 6px;
}

.sensor-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.sensor-row {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    background: none;
    border: none;
    border-radius: 10px;
    padding: 8px 10px;
    cursor: pointer;
    text-align: left;
    font: inherit;
    font-size: 0.85rem;
    color: var(--md-on-surface);
    transition: background 120ms ease;
}
.sensor-row:hover { background: rgba(0,0,0,0.06); }

.sensor-row-dot {
    flex-shrink: 0;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--md-tertiary, #6db87b);
}

.sensor-row-info { display: flex; flex-direction: column; gap: 1px; }
.sensor-row-name { font-weight: 500; }
.sensor-row-type { font-size: 0.77rem; color: var(--md-on-surface-variant); }

.no-sensors-msg {
    font-size: 0.83rem;
    color: var(--md-on-surface-variant);
    font-style: italic;
    padding: 6px 0;
}

/* ── Sensor modal ── */
.sensor-modal-backdrop {
    position: fixed;
    inset: 0;
    z-index: 200;
    background: rgba(0, 20, 14, 0.55);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
}
.sensor-modal-backdrop.hidden { display: none; }

.sensor-modal-card {
    position: relative;
    background: var(--panel);
    border: 1px solid var(--panel-border);
    border-radius: 20px;
    box-shadow: var(--md-elev-3);
    padding: 32px 28px 28px;
    width: min(480px, 90vw);
    max-height: 80vh;
    overflow-y: auto;
}

.sensor-modal-close {
    position: absolute;
    top: 14px;
    right: 16px;
    background: none;
    border: none;
    font-size: 1.3rem;
    cursor: pointer;
    color: var(--md-on-surface-variant);
    line-height: 1;
    padding: 4px 8px;
    border-radius: 8px;
    transition: background 120ms;
}
.sensor-modal-close:hover { background: rgba(0,0,0,0.07); }

#modal-sensor-type { margin: 4px 0 16px; font-size: 1.15rem; }

.modal-sensor-photo {
    width: 100%;
    max-height: 220px;
    object-fit: cover;
    border-radius: 12px;
    border: 1px solid var(--panel-border);
    margin-bottom: 20px;
    display: block;
}

.modal-datasheet-link {
    color: var(--md-primary, #1a7a4a);
    text-decoration: none;
    font-weight: 500;
}
.modal-datasheet-link:hover { text-decoration: underline; }

/* ── Controls overlay ── */
.overlay-title {
    font-weight: 700;
    font-size: 0.85rem;
    color: var(--md-on-surface);
    margin-bottom: 6px;
}

.panel-overlay p {
    font-size: 0.82rem;
    margin: 0 0 3px;
}

/* ── Status bar (admin) ── */
.status {
    font-size: 0.88rem;
    margin: 0 0 16px;
    padding: 8px 12px;
    border-radius: 12px;
    background: var(--md-surface-1);
    color: var(--md-on-surface-variant);
    min-height: 1.6em;
}

.status.success {
    color: #1a5e2a;
    background: rgba(60, 160, 80, 0.12);
}

.status.error {
    color: #8c1a1a;
    background: rgba(200, 60, 60, 0.10);
}

/* ── Form inputs (admin) ── */
.group { margin-bottom: 12px; }

.group label {
    display: block;
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--md-on-surface-variant);
    margin-bottom: 5px;
}

.group input[type="number"] {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--md-outline);
    border-radius: 12px;
    font: inherit;
    font-size: 1rem;
    background: var(--md-surface);
    color: var(--md-on-surface);
    outline: none;
    transition: border-color 160ms;
}

.group input[type="number"]:focus {
    border-color: var(--md-primary);
    box-shadow: 0 0 0 2px color-mix(in srgb, var(--md-primary) 20%, transparent);
}

.actions {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
    margin: 16px 0 12px;
}

.actions button:first-child { grid-column: 1 / -1; }

.toggle {
    margin-bottom: 14px;
    font-size: 0.9rem;
    color: var(--md-on-surface-variant);
}

.toggle input[type="checkbox"] {
    margin-right: 6px;
    accent-color: var(--md-primary);
}

/* ════════════════════════════════════════════════════════
   ANIMATIONS
   ════════════════════════════════════════════════════════ */
@keyframes hotspotPulse {
    0%   { transform: scale(1); }
    50%  { transform: scale(1.1); }
    100% { transform: scale(1); }
}

/* ════════════════════════════════════════════════════════
   RESPONSIVE
   ════════════════════════════════════════════════════════ */
@media (max-width: 1200px) {
    body { overflow: auto; }

    #app-shell {
        grid-template-columns: 1fr;
        grid-template-rows: auto 65vh auto;
        flex: none;
        min-height: 0;
    }

    #scene-root { min-height: 65vh; }

    .panel-left, .panel-right { overflow: visible; }

    .nav-links { display: none; }

    .intro-hero {
        left: 16px;
        right: 16px;
        max-width: none;
        bottom: 60px;
        padding: 20px;
    }

    .intro-headline { font-size: 1.5rem; }
}

@media (max-width: 640px) {
    .nav-badge  { display: none; }
    .footer-links { display: none; }
    .footer-copy  { display: none; }
    .footer-brand { font-size: 0.78rem; }

    .intro-hero { padding: 16px; }
    .intro-headline { font-size: 1.3rem; }
}