/* ==========================================================================
   samples/styles.css
   Shared stylesheet for the jsColorEngine sample / demo pages.
   Palette + tokens match samples/bench/styles.css so the whole site reads
   as one product.
   ========================================================================== */

:root {
    --bg:           #0f1419;
    --bg-card:      #161b22;
    --bg-card-2:    #1c232c;
    --bg-card-3:    #191d23;
    --border:       #2a323d;
    --border-soft:  #1f2630;
    --text:         #e6edf3;
    --text-dim:     #8b95a4;
    --text-muted:   #5c6675;
    --accent:       #a3e635;     /* lime-400 */
    --accent-2:     #4ade80;     /* green-400 */
    --warn:         #fbbf24;
    --error:        #f87171;
    --shadow:       0 1px 3px rgba(0,0,0,0.3), 0 4px 12px rgba(0,0,0,0.15);

    --mono: ui-monospace, 'SF Mono', Menlo, Consolas, 'Liberation Mono', monospace;
    --sans: ui-sans-serif, system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    background: var(--bg);
    color: var(--text);
    font-family: var(--sans);
    font-size: 14px;
    line-height: 1.5;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

code {
    font-family: var(--mono);
    font-size: 0.9em;
    color: var(--text);
    background: var(--bg-card-2);
    padding: 0.1em 0.4em;
    border-radius: 3px;
    border: 1px solid var(--border-soft);
}

main {
    max-width: 1240px;
    margin: 0 auto;
    padding: 0 24px 48px;
}

/* ============================================================ TOPBAR + NAV */

.topbar {
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    padding: 14px 24px 0;
    margin-bottom: 24px;
    position: sticky;
    top: 0;
    z-index: 10;
    box-shadow: var(--shadow);
}

.topbar-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px 16px;
    margin-bottom: 8px;
}
.topbar-head .brand {
    margin-bottom: 0;
}
.topbar-head .nav {
    margin-left: auto;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.brand {
    display: flex;
    align-items: baseline;
    gap: 12px;
    margin-bottom: 12px;
}
.brand-mark {
    font-weight: 700;
    font-size: 18px;
    color: var(--accent);
    letter-spacing: -0.01em;
}
.brand-tag {
    color: var(--text-dim);
    font-size: 13px;
    font-weight: 400;
}

.nav {
    display: flex;
    gap: 4px;
    margin-left: -8px;
}
.nav a {
    background: transparent;
    color: var(--text-dim);
    padding: 10px 16px;
    font-size: 13px;
    border-bottom: 2px solid transparent;
    transition: color 0.12s ease, border-color 0.12s ease;
    border-radius: 4px 4px 0 0;
    text-decoration: none;
}
.nav a:hover { color: var(--text); text-decoration: none; }
.nav a.is-active {
    color: var(--accent);
    border-bottom-color: var(--accent);
}

/* Second row: per-demo subnav (not used on the browser bench). */
.nav--secondary {
    margin-top: 2px;
    padding-top: 8px;
    border-top: 1px solid var(--border-soft);
    flex-wrap: wrap;
    justify-content: flex-start;
}

/* ============================================================ CARD / PANEL */

.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 20px 24px;
    margin-bottom: 18px;
    box-shadow: var(--shadow);
}

.card h2 {
    margin: 0 0 4px;
    font-size: 17px;
    font-weight: 600;
    color: var(--text);
    letter-spacing: -0.005em;
}
.card h3 {
    margin: 18px 0 8px;
    font-size: 14px;
    font-weight: 600;
    color: var(--text);
}

.lead {
    color: var(--text-dim);
    margin: 8px 0 16px;
    max-width: 90ch;
}

.muted { color: var(--text-muted); font-size: 12px; }

/* ============================================================ INFO GRID    */

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1px;
    background: var(--border-soft);
    border: 1px solid var(--border-soft);
    border-radius: 6px;
    overflow: hidden;
    margin-top: 8px;
}
.info-cell {
    background: var(--bg-card-2);
    padding: 10px 14px;
    display: flex;
    flex-direction: column;
    gap: 2px;
    min-height: 50px;
}

.info-cell:hover {
    background: var(--bg-card-3);
}

.info-cell .lbl {
    color: var(--text-muted);
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}
.info-cell .val {
    color: var(--text);
    font-family: var(--mono);
    font-size: 13px;
    word-break: break-word;
}

/* ============================================================ CONTROLS BAR */

.controls {
    display: flex;
    flex-wrap: wrap;
    gap: 10px 14px;
    align-items: flex-end;
    padding: 14px 16px;
    background: var(--bg-card-2);
    border: 1px solid var(--border-soft);
    border-radius: 6px;
    margin: 12px 0;
}

.controls label {
    display: flex;
    flex-direction: column;
    gap: 4px;
    font-size: 11px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.controls select,
.controls input[type=number] {
    background: var(--bg);
    color: var(--text);
    border: 1px solid var(--border);
    padding: 6px 10px;
    border-radius: 4px;
    font: inherit;
    font-size: 13px;
    min-width: 130px;
    text-transform: none;
    letter-spacing: 0;
}
.controls select:focus,
.controls input[type=number]:focus {
    outline: none;
    border-color: var(--accent);
}

button {
    background: transparent;
    color: var(--text);
    border: 1px solid var(--border);
    padding: 7px 16px;
    font: inherit;
    font-size: 13px;
    font-weight: 500;
    border-radius: 4px;
    cursor: pointer;
    transition: background 0.12s ease, border-color 0.12s ease;
}
button:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}
button:not(:disabled):hover { border-color: var(--accent); }

.btn-primary {
    background: var(--accent);
    color: #0a0e12;
    border-color: var(--accent);
    font-weight: 600;
}
.btn-primary:not(:disabled):hover {
    background: var(--accent-2);
    border-color: var(--accent-2);
}

/* ============================================================ DEMO GRID    */

.demo-grid {
    display: grid;
    gap: 18px;
    grid-template-columns: 1fr;
}
@media (min-width: 760px) { .demo-grid { grid-template-columns: 1fr 1fr; } }

.demo-grid canvas {
    display: block;
    width: 100%;
    height: auto;
    border-radius: 6px;
    background: var(--bg-card-2);
    border: 1px solid var(--border-soft);
}

/* Channel separation plates — 4-up grid */
.channels-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 12px;
}
.channels-grid canvas {
    display: block;
    width: 100%;
    height: auto;
    border-radius: 6px;
    background: #fff;
    border: 1px solid var(--border-soft);
}

/* ============================================================ SWATCH       */

.swatch {
    display: inline-block;
    width: 12px;
    height: 12px;
    border-radius: 3px;
    vertical-align: -1px;
    margin-right: 6px;
    border: 1px solid rgba(255,255,255,0.1);
}

/* ============================================================ TIMING BADGE */

.timing {
    font-family: var(--mono);
    font-size: 12px;
    color: var(--accent-2);
}
.timing.is-busy { color: var(--accent); }

/* ============================================================ FOOTER       */

.footer {
    max-width: 1240px;
    margin: 24px auto 18px;
    padding: 16px 24px;
    color: var(--text-muted);
    font-size: 12px;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 8px;
    border-top: 1px solid var(--border-soft);
    font-family: var(--mono);
}

/* ============================================================ RESPONSIVE   */

@media (max-width: 720px) {
    main { padding: 0 12px 24px; }
    .topbar { padding: 10px 12px 0; }
    .card { padding: 16px; }
    .controls { padding: 12px; gap: 8px 10px; }
    .controls select { min-width: 110px; }
    .info-grid { grid-template-columns: 1fr 1fr; }
    .channels-grid { grid-template-columns: 1fr 1fr; }
}