:root {
    --bg: #0f1115;
    --panel-bg: #171a21;
    --panel-border: #2a2e38;
    --text: #e6e8eb;
    --text-dim: #9aa1ac;
    --accent: #00e676;
    --accent-dim: #0a5c33;
    --warn: #ff9100;
    --mono: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.5;
}

a {
    color: var(--accent);
}

.site-header {
    padding: 1.5rem 2rem 1rem;
    text-align: center;
}

.site-header h1 {
    margin: 0 0 0.4rem;
    font-size: 1.8rem;
    letter-spacing: 0.02em;
}

.tagline {
    margin: 0 auto;
    max-width: 640px;
    color: var(--text-dim);
    font-size: 0.95rem;
}

.layout {
    display: grid;
    grid-template-columns: minmax(0, 2fr) minmax(280px, 1fr);
    gap: 1.5rem;
    padding: 0 2rem;
    max-width: 1400px;
    margin: 0 auto;
}

@media (max-width: 900px) {
    .layout {
        grid-template-columns: 1fr;
    }
}

.viewport-panel,
.sidebar {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.mode-switch {
    display: flex;
    gap: 0.5rem;
}

.mode-btn {
    flex: 1;
    padding: 0.6rem;
    background: var(--panel-bg);
    border: 1px solid var(--panel-border);
    color: var(--text-dim);
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.95rem;
}

.mode-btn.active {
    color: var(--bg);
    background: var(--accent);
    border-color: var(--accent);
    font-weight: 600;
}

.canvas-wrap {
    position: relative;
    background: #000;
    border: 1px solid var(--panel-border);
    border-radius: 8px;
    overflow: hidden;
    aspect-ratio: 4 / 3;
    display: flex;
    align-items: center;
    justify-content: center;
}

#displayCanvas {
    max-width: 100%;
    max-height: 100%;
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
}

.drop-zone {
    position: absolute;
    inset: 0;
    display: none;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--text-dim);
    border: 2px dashed var(--panel-border);
    cursor: pointer;
    padding: 1rem;
}

.drop-zone.visible {
    display: flex;
}

.drop-zone.drag-over {
    border-color: var(--accent);
    color: var(--accent);
}

.hud {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem 1.25rem;
    align-items: center;
    padding: 0.6rem 0.9rem;
    background: var(--panel-bg);
    border: 1px solid var(--panel-border);
    border-radius: 6px;
    font-family: var(--mono);
    font-size: 0.85rem;
}

.status {
    color: var(--accent);
    flex: 1 1 auto;
    min-width: 160px;
}

.hud-metric b {
    color: var(--text);
}

.control-group {
    background: var(--panel-bg);
    border: 1px solid var(--panel-border);
    border-radius: 8px;
    padding: 1rem;
}

.control-group h3 {
    margin: 0 0 0.6rem;
    font-size: 1rem;
    color: var(--text);
}

.hint {
    color: var(--text-dim);
    font-size: 0.82rem;
    margin: 0 0 0.6rem;
}

.control-row {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    margin-bottom: 0.6rem;
    font-size: 0.88rem;
}

.control-row:last-child {
    margin-bottom: 0;
}

.control-row label {
    flex: 0 0 auto;
    min-width: 110px;
    color: var(--text-dim);
}

.control-row select,
.control-row input[type="range"] {
    flex: 1;
}

.control-row output {
    min-width: 2.5em;
    text-align: right;
    font-family: var(--mono);
}

button {
    background: var(--panel-bg);
    border: 1px solid var(--panel-border);
    color: var(--text);
    padding: 0.5rem 0.9rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.88rem;
}

button:hover:not(:disabled) {
    border-color: var(--accent);
}

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

#startCameraBtn {
    background: var(--accent-dim);
    border-color: var(--accent);
}

select {
    background: var(--bg);
    color: var(--text);
    border: 1px solid var(--panel-border);
    border-radius: 4px;
    padding: 0.35rem;
}

.warning {
    background: rgba(255, 145, 0, 0.12);
    border: 1px solid var(--warn);
    color: var(--warn);
    padding: 0.5rem 0.7rem;
    border-radius: 6px;
    font-size: 0.82rem;
    margin-bottom: 0.6rem;
}

.family-list {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.family-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.family-label {
    flex: 1;
    font-family: var(--mono);
    font-size: 0.85rem;
    color: var(--family-color, var(--text));
}

.family-hamming {
    font-size: 0.78rem;
    padding: 0.2rem;
}

.data-panel {
    max-width: 1400px;
    margin: 1.5rem auto 0;
    padding: 0 2rem 2rem;
}

.data-panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.6rem;
}

.data-panel-header h3 {
    margin: 0;
}

.table-wrap {
    overflow-x: auto;
    border: 1px solid var(--panel-border);
    border-radius: 8px;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-family: var(--mono);
    font-size: 0.82rem;
}

thead {
    background: var(--panel-bg);
}

th, td {
    padding: 0.5rem 0.7rem;
    text-align: left;
    white-space: nowrap;
    border-bottom: 1px solid var(--panel-border);
}

.corners-cell {
    max-width: 320px;
    overflow-x: auto;
    white-space: nowrap;
}

.site-footer {
    text-align: center;
    color: var(--text-dim);
    font-size: 0.8rem;
    padding: 1.5rem 2rem 2.5rem;
}