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

:root {
    --sidebar-w: 320px;
    --header-h: 48px;
    --bg: #1a1a2e;
    --sidebar-bg: #16213e;
    --card-bg: #1e2a4a;
    --accent: #3b82f6;
    --text: #e2e8f0;
    --text-dim: #94a3b8;
    --border: #334155;
    --green: #22c55e;
    --yellow: #eab308;
    --orange: #f97316;
    --red: #ef4444;
}

html, body { height: 100%; font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; background: var(--bg); color: var(--text); overflow: hidden; }

/* Layout */
.app { display: flex; flex-direction: column; height: 100vh; }
header { height: var(--header-h); background: var(--sidebar-bg); border-bottom: 1px solid var(--border); display: flex; align-items: center; padding: 0 16px; gap: 12px; flex-shrink: 0; position: relative; }
header h1 { font-size: 16px; font-weight: 600; white-space: nowrap; }
header .spacer { flex: 1; }
header button { background: var(--card-bg); border: 1px solid var(--border); color: var(--text); padding: 4px 12px; border-radius: 6px; cursor: pointer; font-size: 13px; }
header button:hover { background: var(--accent); border-color: var(--accent); }
.header-actions { display: contents; }
.header-menu-toggle { display: none; }

.main { display: flex; flex: 1; overflow: hidden; }

/* Sidebar */
.sidebar { width: var(--sidebar-w); min-width: var(--sidebar-w); background: var(--sidebar-bg); border-right: 1px solid var(--border); overflow-y: scroll; padding: 12px; display: flex; flex-direction: column; gap: 12px; }

.panel { background: var(--card-bg); border-radius: 8px; padding: 12px; }
.panel h3 { font-size: 13px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.5px; color: var(--text-dim); margin-bottom: 8px; }

.form-row { display: flex; flex-direction: column; gap: 4px; margin-bottom: 8px; }
.form-row label { font-size: 12px; color: var(--text-dim); }
.form-row select, .form-row input { background: var(--bg); border: 1px solid var(--border); color: var(--text); padding: 6px 8px; border-radius: 4px; font-size: 13px; width: 100%; }
.form-row select:focus, .form-row input:focus { outline: none; border-color: var(--accent); }
.form-row-inline { display: flex; gap: 8px; }
.form-row-inline .form-row { flex: 1; }

.btn { background: var(--accent); color: white; border: none; padding: 8px 12px; border-radius: 6px; cursor: pointer; font-size: 13px; font-weight: 500; width: 100%; }
.btn:hover { opacity: 0.9; }
.btn-secondary { background: var(--card-bg); border: 1px solid var(--border); color: var(--text); }
.btn-secondary:hover { background: var(--border); }
.btn-danger { background: var(--red); }
.btn-sm { padding: 4px 8px; font-size: 12px; width: auto; }

/* Camera list */
.camera-item { display: flex; flex-direction: column; gap: 4px; padding: 8px; border-radius: 6px; margin-bottom: 4px; }
.camera-item:hover { background: rgba(255,255,255,0.05); }
.camera-item-row { display: flex; align-items: center; gap: 8px; }
.camera-item .swatch { width: 12px; height: 12px; border-radius: 50%; flex-shrink: 0; }
.camera-item .cam-name { flex: 1; font-size: 13px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.camera-item .cam-toggle { background: none; border: none; color: var(--text-dim); cursor: pointer; font-size: 16px; padding: 2px; }
.camera-item .cam-toggle.active { color: var(--green); }
.camera-item .cam-delete { background: none; border: none; color: var(--text-dim); cursor: pointer; font-size: 14px; padding: 2px; }
.camera-item .cam-delete:hover { color: var(--red); }
.camera-item-specs { font-size: 11px; color: var(--text-dim); padding-left: 20px; line-height: 1.5; }
.camera-item-specs a { color: var(--text-dim); text-decoration: underline; }

/* Marker list */
.marker-item { display: flex; align-items: center; gap: 6px; padding: 4px 0; font-size: 13px; }
.marker-item .marker-dist { flex: 1; }
.marker-item button { background: none; border: none; color: var(--text-dim); cursor: pointer; font-size: 12px; }
.marker-item button:hover { color: var(--red); }

/* Canvas area */
.canvas-area { flex: 1; position: relative; overflow: hidden; background: #0f0f1a; display: flex; align-items: center; justify-content: center; }

.canvas-container { position: relative; }
.canvas-container canvas { display: block; }
#overlay-canvas { position: absolute; top: 0; left: 0; cursor: crosshair; }

/* Upload zone */
.upload-zone { position: absolute; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 16px; border: 2px dashed var(--border); border-radius: 12px; margin: 40px; cursor: pointer; transition: border-color 0.2s; text-align: center; }
.upload-zone:hover, .upload-zone.dragover { border-color: var(--accent); }
.upload-zone .icon { font-size: 48px; color: var(--text-dim); }
.upload-zone p { color: var(--text-dim); font-size: 14px; }
.upload-zone.hidden { display: none; }

/* Mini-map */
.minimap-container { background: var(--bg); border-radius: 8px; padding: 8px; }
.minimap-container canvas { width: 100%; }

/* Comparison modal */
.modal-backdrop { position: fixed; inset: 0; background: rgba(0,0,0,0.6); display: flex; align-items: center; justify-content: center; z-index: 100; }
.modal-backdrop.hidden { display: none; }
.modal { background: var(--sidebar-bg); border: 1px solid var(--border); border-radius: 12px; padding: 20px; max-width: 800px; width: 90%; max-height: 80vh; overflow-y: auto; }
.modal h2 { font-size: 16px; margin-bottom: 16px; }
.modal table { width: 100%; border-collapse: collapse; font-size: 13px; }
.modal th, .modal td { padding: 8px 12px; text-align: left; border-bottom: 1px solid var(--border); }
.modal th { color: var(--text-dim); font-weight: 500; font-size: 12px; text-transform: uppercase; letter-spacing: 0.5px; }
.modal .ppf-id { color: var(--green); }
.modal .ppf-rec { color: var(--yellow); }
.modal .ppf-det { color: var(--orange); }
.modal .ppf-none { color: var(--red); }
.modal .close-btn { float: right; background: none; border: none; color: var(--text-dim); font-size: 20px; cursor: pointer; }
.modal .close-btn:hover { color: var(--text); }
.compare-actions { display: flex; gap: 8px; margin-bottom: 14px; }
.compare-actions button { font-size: 12px; padding: 5px 12px; border-radius: 6px; border: 1px solid var(--border); background: var(--input-bg); color: var(--text); cursor: pointer; }
.compare-actions button:hover { background: var(--border); }
.compare-actions button.copied { color: var(--green); border-color: var(--green); }

/* Canvas rotation */
.canvas-container.rotated { overflow: visible; }

/* Drag cursor when aiming FOV */
#overlay-canvas.drag-fov { cursor: move; }

/* Banners on canvas */
.fov-banner { position: absolute; top: 8px; left: 50%; transform: translateX(-50%); background: rgba(0,0,0,0.75); color: var(--text); padding: 6px 14px; border-radius: 6px; font-size: 12px; white-space: nowrap; pointer-events: none; z-index: 10; }

/* Range slider styling */
input[type="range"] { -webkit-appearance: none; appearance: none; height: 4px; background: var(--border); border-radius: 2px; outline: none; }
input[type="range"]::-webkit-slider-thumb { -webkit-appearance: none; appearance: none; width: 14px; height: 14px; background: var(--accent); border-radius: 50%; cursor: pointer; }
input[type="range"]::-moz-range-thumb { width: 14px; height: 14px; background: var(--accent); border-radius: 50%; cursor: pointer; border: none; }

/* Info text */
.info-text { font-size: 12px; color: var(--text-dim); line-height: 1.4; }

/* Custom camera modal */
.custom-cam-fields { display: flex; flex-direction: column; gap: 6px; margin-top: 8px; }

/* Scrollbar */
.sidebar::-webkit-scrollbar { width: 6px; }
.sidebar::-webkit-scrollbar-track { background: transparent; }
.sidebar::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }

/* Collapsible panels */
.panel.collapsible { padding-bottom: 0; }
.panel-header { display: flex; align-items: center; gap: 6px; cursor: pointer; user-select: none; padding-bottom: 12px; }
.panel-header h3 { flex: 1; margin-bottom: 0; }
.panel-header .step-check { color: var(--green); font-size: 13px; display: none; flex-shrink: 0; }
.panel.complete .panel-header .step-check { display: inline; }
.panel.complete .panel-header h3 { color: var(--text-dim); }
.panel-header .chevron { color: var(--text); font-size: 20px; transition: transform 0.2s; flex-shrink: 0; }
.panel.collapsed .panel-header .chevron { transform: rotate(-90deg); }
.panel-header .panel-summary { font-size: 11px; color: var(--text-dim); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; display: none; }
.panel.collapsed .panel-header { flex-wrap: wrap; }
.panel.collapsed .panel-header .panel-summary { display: block; order: 5; flex-basis: 100%; margin-top: -4px; }
.panel-body { overflow: hidden; max-height: 800px; transition: max-height 0.25s ease; }
.panel.collapsed .panel-body { max-height: 0; }

/* "Next" step button */
.btn-next-step { margin-top: 10px; margin-bottom: 12px; background: var(--accent); color: white; border: none; padding: 7px 12px; border-radius: 6px; cursor: pointer; font-size: 13px; font-weight: 500; width: 100%; }
.btn-next-step:hover:not(:disabled) { opacity: 0.9; }
.btn-next-step:disabled { opacity: 0.35; cursor: not-allowed; }

/* Legend */
.legend { display: flex; flex-direction: column; gap: 4px; }
.legend-item { display: flex; align-items: center; gap: 6px; font-size: 12px; }
.legend-swatch { width: 16px; height: 10px; border-radius: 2px; }

/* Main content — stacks canvas + preview vertically */
#main-content { display: flex; flex-direction: column; align-items: center; gap: 12px; }

/* Camera preview panel — overlays at the bottom of the canvas area */
.preview-panel { position: absolute; bottom: 0; left: 0; right: 0; background: var(--card-bg); border-radius: 8px 8px 0 0; overflow: hidden; z-index: 20; max-height: 50%; overflow-y: auto; }
.preview-header { display: flex; align-items: center; gap: 10px; padding: 8px 12px; border-bottom: 1px solid var(--border); flex-wrap: wrap; }
.preview-header h3 { font-size: 13px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.5px; color: var(--text-dim); margin: 0; white-space: nowrap; }
.preview-header select { background: var(--bg); border: 1px solid var(--border); color: var(--text); padding: 4px 8px; border-radius: 4px; font-size: 12px; }
.preview-header .info-text { flex: 1; font-size: 11px; }
.preview-container { background: #000; }
.preview-container canvas { width: 100%; display: block; }


/* ── Session restore banner ── */
#restore-banner {
    background: var(--card-bg);
    border-bottom: 1px solid var(--border);
    color: var(--text-dim);
    font-size: 12px;
    padding: 6px 16px;
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}
#restore-banner button {
    margin-left: auto;
    background: none;
    border: 1px solid var(--border);
    color: var(--text-dim);
    border-radius: 4px;
    padding: 2px 8px;
    font-size: 11px;
    cursor: pointer;
}
#restore-banner button:hover { color: var(--text); border-color: var(--text-dim); }

/* Sidebar toggle (hamburger) — hidden on desktop */
#btn-sidebar-toggle { display: none; }

/* Sidebar backdrop — hidden by default */
.sidebar-backdrop { display: none; }

/* Touch: prevent browser gestures on interactive canvas areas */
.canvas-area, #overlay-canvas { touch-action: none; }

/* ── Mobile / Tablet ── */
@media (max-width: 768px) {
    header { height: auto; min-height: var(--header-h); padding: 6px 10px; gap: 6px; }
    header h1 { font-size: 14px; }

    #btn-sidebar-toggle {
        display: block;
        background: none;
        border: none;
        color: var(--text);
        font-size: 22px;
        padding: 2px 6px;
        cursor: pointer;
        line-height: 1;
    }

    .header-menu-toggle {
        display: block;
        background: none;
        border: 1px solid var(--border);
        color: var(--text);
        font-size: 18px;
        padding: 2px 8px;
        border-radius: 6px;
        cursor: pointer;
        line-height: 1;
    }
    .header-menu-toggle:hover { background: var(--accent); border-color: var(--accent); }

    .header-actions {
        display: none;
        position: absolute;
        top: 100%;
        right: 0;
        background: var(--sidebar-bg);
        border: 1px solid var(--border);
        border-radius: 0 0 8px 8px;
        padding: 6px;
        z-index: 70;
        flex-direction: column;
        gap: 2px;
        min-width: 180px;
        box-shadow: 0 4px 12px rgba(0,0,0,0.3);
    }
    .header-actions.open { display: flex; }
    .header-actions button { width: 100%; text-align: left; padding: 8px 12px; font-size: 13px; border-radius: 4px; }

    .sidebar {
        position: fixed;
        top: 0;
        left: 0;
        bottom: 0;
        z-index: 60;
        transform: translateX(-100%);
        transition: transform 0.25s ease;
        border-right: 1px solid var(--border);
    }
    .sidebar.open { transform: translateX(0); }

    .sidebar-backdrop {
        display: none;
        position: fixed;
        inset: 0;
        background: rgba(0,0,0,0.4);
        z-index: 55;
    }
    .sidebar-backdrop.visible { display: block; }

    .upload-zone { margin: 16px; }
}