/* Systems Lab — shared shell styles.
   Dark, technical, dependency-free. Shared by the landing page and every demo. */

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

:root {
    --bg: #0a1120;
    --surface: #111c31;
    --surface-2: #16233c;
    --border: #223148;
    --border-strong: #2f425f;
    --text: #e5edf7;
    --muted: #8ba0bd;
    --faint: #5c7089;
    --accent: #38bdf8;
    --accept: #34d399;
    --reject: #f87171;
    --warn: #fbbf24;
    --radius: 12px;
    --mono: 'SFMono-Regular', 'JetBrains Mono', 'Menlo', 'Consolas', monospace;
    --sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

body {
    font-family: var(--sans);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

.wrap {
    max-width: 1080px;
    margin: 0 auto;
    padding: 1.5rem 1.25rem 4rem;
}

/* Top bar */
.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.5rem 0 1.25rem;
    border-bottom: 1px solid var(--border);
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.topbar .brand {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-weight: 600;
    letter-spacing: -0.01em;
}

.topbar .brand .dot {
    width: 9px; height: 9px; border-radius: 50%;
    background: var(--accept);
    box-shadow: 0 0 0 3px rgba(52, 211, 153, 0.18);
}

.topbar a { color: var(--muted); text-decoration: none; font-size: 0.9rem; }
.topbar a:hover { color: var(--accent); }
.topnav { display: flex; gap: 1.1rem; }
.topbar .crumbs { font-family: var(--mono); font-size: 0.85rem; }
.topbar .crumbs span { color: var(--faint); }

/* Landing header */
.lead h1 {
    font-size: 2rem;
    letter-spacing: -0.02em;
    margin-bottom: 0.5rem;
}
.lead p {
    color: var(--muted);
    max-width: 60ch;
    font-size: 1.02rem;
}
.lead .byline {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
    font-size: 0.92rem;
    color: var(--muted);
    max-width: 60ch;
}
.lead .byline b { color: var(--text); font-weight: 600; }
.lead .byline a { color: var(--accent); text-decoration: none; white-space: nowrap; }
.lead .byline a:hover { text-decoration: underline; }

.lead .kicker {
    font-family: var(--mono);
    font-size: 0.78rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 0.75rem;
}

/* Demo grid (landing) */
.demo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1rem;
    margin-top: 2.5rem;
}

.demo-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem;
    text-decoration: none;
    color: var(--text);
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    transition: border-color 0.2s, transform 0.2s;
    position: relative;
}
.demo-card.live:hover {
    border-color: var(--accent);
    transform: translateY(-3px);
}
.demo-card.soon {
    opacity: 0.55;
    cursor: default;
}
.demo-card .card-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
}
.demo-card h2 { font-size: 1.05rem; font-weight: 600; }
.demo-card p { color: var(--muted); font-size: 0.88rem; line-height: 1.5; }

.status {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    font-family: var(--mono);
    font-size: 0.68rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--muted);
    white-space: nowrap;
}
.status .s-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--faint); }
.status.live .s-dot { background: var(--accept); }
.status.live { color: var(--accept); }

/* Demo page header */
.demo-header { margin-bottom: 1.5rem; }
.demo-header h1 { font-size: 1.6rem; letter-spacing: -0.02em; margin-bottom: 0.35rem; }
.demo-header p { color: var(--muted); max-width: 68ch; }

/* Banner (offered vs sustained load) */
.banner {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    flex-wrap: wrap;
    background: var(--surface);
    border: 1px solid var(--border);
    border-left: 3px solid var(--accent);
    border-radius: var(--radius);
    padding: 0.85rem 1.1rem;
    margin-bottom: 1.25rem;
    font-family: var(--mono);
    font-size: 0.9rem;
}
.banner .b-item { color: var(--muted); }
.banner .b-item b { color: var(--text); font-weight: 600; }
.banner .b-status {
    margin-left: auto;
    padding: 0.2rem 0.7rem;
    border-radius: 20px;
    font-size: 0.78rem;
    letter-spacing: 0.03em;
}
.banner .b-status.ok   { background: rgba(52,211,153,0.14); color: var(--accept); }
.banner .b-status.warn { background: rgba(251,191,36,0.14); color: var(--warn); }
.banner .b-status.over { background: rgba(248,113,113,0.14); color: var(--reject); }
.banner.ok   { border-left-color: var(--accept); }
.banner.warn { border-left-color: var(--warn); }
.banner.over { border-left-color: var(--reject); }

/* Controls */
.controls {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1rem 1.5rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem;
    margin-bottom: 1.5rem;
    align-items: end;
}
.control label {
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
    color: var(--muted);
    margin-bottom: 0.5rem;
}
.control label b { color: var(--text); font-family: var(--mono); font-weight: 600; }
.control-actions {
    display: flex;
    gap: 0.6rem;
    align-items: center;
    flex-wrap: wrap;
}

input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 4px;
    border-radius: 4px;
    background: var(--border);
    outline: none;
}
input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px; height: 18px;
    border-radius: 50%;
    background: var(--accent);
    cursor: pointer;
    border: 3px solid var(--bg);
    box-shadow: 0 0 0 1px var(--accent);
}
input[type="range"]::-moz-range-thumb {
    width: 18px; height: 18px;
    border-radius: 50%;
    background: var(--accent);
    cursor: pointer;
    border: 3px solid var(--bg);
}

button {
    font-family: var(--sans);
    font-size: 0.9rem;
    font-weight: 600;
    padding: 0.55rem 1.1rem;
    border-radius: 8px;
    border: 1px solid var(--border-strong, #2f425f);
    background: var(--surface-2);
    color: var(--text);
    cursor: pointer;
    transition: all 0.15s;
}
button:hover { border-color: var(--accent); color: var(--accent); }
button.primary { background: var(--accent); color: #06121f; border-color: var(--accent); }
button.primary:hover { background: #6fd0fb; color: #06121f; }
button.ghost { background: transparent; }

/* Panels */
.panels {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}
.panel {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.1rem;
    display: flex;
    flex-direction: column;
    gap: 0.7rem;
}
.panel-head { display: flex; flex-direction: row; align-items: flex-start; justify-content: space-between; gap: 0.5rem; }
.panel-titles { display: flex; flex-direction: column; gap: 0.15rem; }
.panel-name { font-weight: 600; font-size: 0.98rem; }
.panel-note { color: var(--muted); font-size: 0.78rem; }

.panel-info-btn {
    width: 22px; height: 22px; flex-shrink: 0;
    padding: 0; line-height: 1;
    border-radius: 50%;
    font-family: Georgia, 'Times New Roman', serif;
    font-style: italic; font-weight: 700; font-size: 0.8rem;
    color: var(--muted);
    background: var(--surface-2);
    border: 1px solid var(--border);
}
.panel-info-btn:hover,
.panel-info-btn[aria-expanded="true"] { color: var(--accent); border-color: var(--accent); }

.how {
    font-size: 0.8rem;
    color: var(--muted);
    line-height: 1.55;
    background: var(--surface-2);
    border-radius: 8px;
    border-left: 2px solid var(--accent);
    padding: 0.65rem 0.8rem;
}
.how b { color: var(--text); font-weight: 600; }
.how[hidden] { display: none; }

.panel-status {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.8rem;
    color: var(--muted);
    min-height: 1.25rem;
    line-height: 1.3;
}
.panel-status .st-dot {
    width: 7px; height: 7px; border-radius: 50%;
    flex-shrink: 0;
    background: var(--faint);
    transition: background 0.2s;
}

.gauge-label {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    font-family: var(--mono);
    font-size: 0.78rem;
    color: var(--muted);
}
.gauge-sub { color: var(--faint); font-size: 0.72rem; }

.gauge {
    height: 10px;
    border-radius: 6px;
    background: var(--surface-2);
    overflow: hidden;
}
.gauge-fill {
    height: 100%;
    width: 100%;
    background: var(--accept);
    border-radius: 6px;
    transition: width 0.08s linear, background 0.2s;
}
.wintimer {
    height: 3px;
    border-radius: 3px;
    background: var(--surface-2);
    overflow: hidden;
    margin-top: -0.3rem;
}
.wintimer-fill { height: 100%; background: var(--faint); width: 0%; }

.panel-stats {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    margin-top: 0.2rem;
}
.stat-big { font-size: 1.7rem; font-weight: 700; font-family: var(--mono); letter-spacing: -0.02em; }
.stat-sub { font-family: var(--mono); font-size: 0.76rem; color: var(--muted); }
.stat-sub b { color: var(--text); }

.strip {
    width: 100%;
    height: 34px;
    display: block;
    background: var(--surface-2);
    border-radius: 6px;
}
.strip-caption {
    font-family: var(--mono);
    font-size: 0.68rem;
    color: var(--faint);
    margin-top: -0.4rem;
}

/* Explainer */
.explainer {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
}
.explainer h2 { font-size: 1.1rem; margin-bottom: 0.75rem; }
.explainer h3 { font-size: 0.9rem; margin: 1.25rem 0 0.4rem; color: var(--accent); }
.explainer p { color: var(--muted); font-size: 0.92rem; margin-bottom: 0.6rem; }
.explainer code {
    font-family: var(--mono);
    font-size: 0.85em;
    background: var(--surface-2);
    padding: 0.1rem 0.35rem;
    border-radius: 4px;
    color: var(--text);
}
.explainer table {
    width: 100%;
    border-collapse: collapse;
    margin: 0.75rem 0 0.5rem;
    font-size: 0.86rem;
}
.explainer th, .explainer td {
    text-align: left;
    padding: 0.6rem 0.75rem;
    border-bottom: 1px solid var(--border);
    vertical-align: top;
}
.explainer th { color: var(--muted); font-weight: 600; font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.04em; }
.explainer td:first-child { color: var(--text); font-weight: 600; white-space: nowrap; }
.explainer td { color: var(--muted); }
.explainer .try {
    margin-top: 1rem;
    padding: 1rem 1.15rem;
    background: var(--surface-2);
    border-radius: 8px;
    border-left: 3px solid var(--warn);
}
.explainer .try ul { margin: 0.4rem 0 0 1.1rem; }
.explainer .try li { color: var(--muted); font-size: 0.88rem; margin-bottom: 0.3rem; }

footer.lab-footer {
    text-align: center;
    color: var(--faint);
    font-size: 0.85rem;
    margin-top: 3rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
}
footer.lab-footer a { color: var(--muted); text-decoration: none; }
footer.lab-footer a:hover { color: var(--accent); }

@media (max-width: 560px) {
    .lead h1 { font-size: 1.6rem; }
    .stat-big { font-size: 1.4rem; }
}