/**
 * Main stylesheet for Forward Attention Visualization
 */

:root {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-tertiary: #3a3a3a;
    --text-primary: #ffffff;
    --text-secondary: #b0b0b0;
    --accent: #4a9eff;
    --accent-hover: #6bb0ff;
    --border: #404040;
    --error: #f44336;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
    min-height: 0;
}

html,
body {
    overflow-y: auto;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
}

html.is-embedded,
html.is-embedded body,
body.is-embedded {
    overflow-y: hidden;
}

.hidden {
    display: none !important;
}

header {
    background: var(--bg-secondary);
    padding: 1.25rem 2rem;
    border-bottom: 1px solid var(--border);
}

header h1 {
    font-size: 1.8rem;
    margin-bottom: 0.5rem;
}

header p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 60vh;
    gap: 1rem;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.error {
    background: var(--error);
    color: white;
    padding: 1rem 2rem;
    margin: 1rem 2rem;
    border-radius: 6px;
}

.top-controls {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.controls-heading {
    margin-bottom: 0.25rem;
    font-size: 1.1rem;
    color: var(--text-primary);
}

.control-group {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
    align-items: center;
}

.control-group label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.control-group select,
.control-group input[type="range"] {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 4px;
    color: var(--text-primary);
    padding: 0.4rem 0.6rem;
}

#alpha-value {
    font-variant-numeric: tabular-nums;
    color: var(--text-primary);
    min-width: 3.5rem;
    display: inline-block;
}

.status-line {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.main-layout {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    padding: 1.5rem;
    max-width: 2800px;
    margin: 0 auto;
}

.below-strip-layout {
    display: grid;
    grid-template-columns: minmax(320px, 420px) 1fr;
    grid-template-areas: "controls bev";
    gap: 1.25rem;
    align-items: start;
}

.top-controls {
    grid-area: controls;
}

#bev-view {
    grid-area: bev;
}

/* Override compact iframe defaults with slightly larger spacing. */
#main-content .main-layout {
    gap: 16px !important;
    padding: 16px !important;
}

#main-content .below-strip-layout {
    gap: 16px !important;
}

#main-content .top-controls,
#main-content .bev-view,
#main-content .camera-strip-view {
    padding: 10px !important;
}

@media (max-width: 820px) {
    .main-layout {
        padding: 1rem;
    }

    .below-strip-layout {
        grid-template-columns: 1fr;
        grid-template-areas:
            "bev"
            "controls";
    }
}

.bev-view,
.camera-strip-view {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.25rem;
}

.bev-view h2,
.camera-strip-view h2 {
    margin-bottom: 0.75rem;
    font-size: 1.2rem;
}

.bev-container {
    background: var(--bg-tertiary);
    border-radius: 6px;
    padding: 1rem;
    display: flex;
    justify-content: center;
    align-items: flex-start; /* keep BEV attached to top */
    min-height: 420px;
    position: relative;
}

#bev-base-img,
.bev-base-img {
    position: absolute;
    inset: 1rem; /* match container padding */
    width: calc(100% - 2rem);
    height: calc(100% - 2rem);
    object-fit: contain;
    border-radius: 4px;
    pointer-events: none;
    user-select: none;
}

#bev-canvas {
    max-width: 100%;
    height: auto;
    border-radius: 4px;
    background: #fff;
    cursor: crosshair;
    position: relative;
    z-index: 1;
}

.camera-strip {
    display: flex;
    gap: 1rem;
    overflow-x: auto;
    overflow-y: hidden;
    padding: 0.5rem;
    background: var(--bg-tertiary);
    border-radius: 6px;
    height: 340px;       /* "window" height so BEV stays visible */
    max-height: 340px;
    align-items: flex-start;
}

.camera-strip-item {
    flex: 0 0 auto;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    padding: 0.5rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: rgba(0, 0, 0, 0.25);
}

.camera-strip-item canvas {
    border-radius: 4px;
    background: #000;
    cursor: default;
    max-height: 280px;   /* fit inside strip window */
}

.camera-strip-label {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 600;
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--bg-tertiary);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--border);
}