/* TerraVis Online Evaluation — design tokens + base elements ("Precision Instrument"). */

:root {
  --font-display: "Space Grotesk", "Inter", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-body: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;

  --radius-lg: 14px;
  --radius: 10px;
  --radius-sm: 6px;
  --gutter: clamp(16px, 4vw, 40px);
  --maxw: 1320px;
  --ease: cubic-bezier(.2, .7, .2, 1);

  /* light theme ("lab notebook") */
  --bg: #eef2f7;
  --bg-glow: rgba(0, 140, 190, .10);
  --grid: rgba(20, 50, 100, .055);
  --surface: #ffffff;
  --surface-2: #f5f7fb;
  --surface-3: #e8edf5;
  --line: rgba(15, 35, 70, .12);
  --line-strong: rgba(15, 35, 70, .24);
  --text: #0a1322;
  --text-2: #3a475d;
  --text-3: #4f5c71;
  --accent: #006985;
  --accent-2: #0090b8;
  --accent-ink: #ffffff;
  --accent-soft: rgba(0, 112, 143, .09);
  --accent-glow: rgba(0, 144, 184, .28);
  --clear: #04754f;
  --clear-soft: rgba(4, 117, 79, .09);
  --minor: #8a4f00;
  --minor-soft: rgba(214, 138, 0, .14);
  --major: #b3213b;
  --major-soft: rgba(179, 33, 59, .09);
  --unclear: #6644cc;
  --unclear-soft: rgba(102, 68, 204, .09);
  --major-g: #e11d48;
  --minor-g: #d97706;
  --clear-g: #059669;
  --shadow: 0 1px 2px rgba(10, 20, 40, .05), 0 12px 32px -18px rgba(10, 30, 60, .28);
  --overlay: rgba(238, 242, 247, .86);
  --img-bg: #dfe5ee;
  color-scheme: light;
}

:root[data-theme="dark"] {
  --bg: #060a13;
  --bg-glow: rgba(63, 224, 255, .08);
  --grid: rgba(120, 170, 255, .045);
  --surface: #0b1220;
  --surface-2: #0f1829;
  --surface-3: #152036;
  --line: rgba(130, 170, 230, .14);
  --line-strong: rgba(130, 170, 230, .28);
  --text: #e7eef8;
  --text-2: #a6b4c9;
  --text-3: #93a2b9;
  --accent: #3fe0ff;
  --accent-2: #7cecff;
  --accent-ink: #04121a;
  --accent-soft: rgba(63, 224, 255, .09);
  --accent-glow: rgba(63, 224, 255, .38);
  --clear: #45e0a0;
  --clear-soft: rgba(69, 224, 160, .09);
  --minor: #ffb648;
  --minor-soft: rgba(255, 182, 72, .11);
  --major: #ff6b81;
  --major-soft: rgba(255, 107, 129, .11);
  --unclear: #b59cff;
  --unclear-soft: rgba(181, 156, 255, .11);
  --major-g: #ff6b81;
  --minor-g: #ffb648;
  --clear-g: #45e0a0;
  --shadow: 0 1px 0 rgba(255, 255, 255, .03) inset, 0 18px 40px -24px rgba(0, 0, 0, .8);
  --overlay: rgba(6, 10, 19, .84);
  --img-bg: #050910;
  color-scheme: dark;
}

/* Same dark tokens when the boot script did not run and the OS prefers dark. */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]):not([data-theme="dark"]) {
    --bg: #060a13; --bg-glow: rgba(63, 224, 255, .08); --grid: rgba(120, 170, 255, .045);
    --surface: #0b1220; --surface-2: #0f1829; --surface-3: #152036;
    --line: rgba(130, 170, 230, .14); --line-strong: rgba(130, 170, 230, .28);
    --text: #e7eef8; --text-2: #a6b4c9; --text-3: #93a2b9;
    --accent: #3fe0ff; --accent-2: #7cecff; --accent-ink: #04121a; --accent-soft: rgba(63, 224, 255, .09); --accent-glow: rgba(63, 224, 255, .38);
    --clear: #45e0a0; --clear-soft: rgba(69, 224, 160, .09);
    --minor: #ffb648; --minor-soft: rgba(255, 182, 72, .11);
    --major: #ff6b81; --major-soft: rgba(255, 107, 129, .11);
    --unclear: #b59cff; --unclear-soft: rgba(181, 156, 255, .11);
    --major-g: #ff6b81; --minor-g: #ffb648; --clear-g: #45e0a0;
    --shadow: 0 18px 40px -24px rgba(0, 0, 0, .8); --overlay: rgba(6, 10, 19, .84); --img-bg: #050910;
    color-scheme: dark;
  }
}

/* ---------- base ---------- */
*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 76px; }
body {
  margin: 0;
  min-width: 320px;
  background-color: var(--bg);
  background-image:
    radial-gradient(1200px 520px at 78% -8%, var(--bg-glow), transparent 70%),
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: auto, 40px 40px, 40px 40px;
  background-position: 0 0, -1px -1px, -1px -1px;
  color: var(--text);
  font: 400 16px/1.6 var(--font-body);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img, svg { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; }
button:disabled { cursor: not-allowed; }
a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--accent-2); }
h1, h2, h3, h4 { font-family: var(--font-display); line-height: 1.15; margin: 0; letter-spacing: -0.01em; }
p { margin: 0; }
code, kbd, pre, .mono { font-family: var(--font-mono); font-feature-settings: "zero" 1, "tnum" 1; }
kbd {
  font-size: .78em; padding: .05em .4em; border: 1px solid var(--line-strong); border-bottom-width: 2px;
  border-radius: 4px; background: var(--surface-2); color: var(--text-2);
}
sub, sup { font-size: .68em; line-height: 0; }
.dim { color: var(--text-3); }
::selection { background: var(--accent-glow); }

:focus { outline: none; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }

.visually-hidden {
  position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.sprite { position: absolute; width: 0; height: 0; overflow: hidden; }
.skip-link {
  position: absolute; left: 12px; top: -60px; z-index: 100; padding: 10px 14px; border-radius: var(--radius-sm);
  background: var(--accent); color: var(--accent-ink); font-weight: 600; text-decoration: none;
}
.skip-link:focus { top: 12px; }

.icon { width: 18px; height: 18px; flex: none; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }

/* ---------- buttons ---------- */
.btn {
  --b: var(--line-strong);
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 40px; padding: 8px 16px; border-radius: var(--radius-sm);
  border: 1px solid var(--b); background: transparent; color: var(--text);
  font-weight: 600; font-size: 14.5px; letter-spacing: .005em; text-decoration: none; white-space: nowrap;
  transition: background-color .15s, border-color .15s, color .15s, box-shadow .2s, transform .1s;
}
.btn:hover { background: var(--accent-soft); border-color: var(--accent); color: var(--text); }
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: .45; background: transparent; border-color: var(--line-strong); transform: none; }
.btn--primary {
  background: var(--accent); border-color: var(--accent); color: var(--accent-ink);
  box-shadow: 0 0 0 0 var(--accent-glow), 0 8px 24px -12px var(--accent-glow);
}
.btn--primary:hover { background: var(--accent-2); border-color: var(--accent-2); color: var(--accent-ink); box-shadow: 0 0 0 4px var(--accent-soft), 0 10px 28px -12px var(--accent-glow); }
.btn--primary:disabled { background: var(--surface-3); color: var(--text-3); border-color: var(--line); box-shadow: none; }
.btn--lg { min-height: 48px; padding: 12px 22px; font-size: 15.5px; }
.btn--sm { min-height: 34px; padding: 6px 12px; font-size: 13.5px; }
.btn--sm .icon { width: 16px; height: 16px; }

.icon-btn {
  display: inline-grid; place-items: center; width: 38px; height: 38px; flex: none;
  border-radius: var(--radius-sm); border: 1px solid var(--line); background: var(--surface);
  color: var(--text-2); text-decoration: none; font: 600 16px/1 var(--font-mono);
  transition: color .15s, border-color .15s, background-color .15s;
}
.icon-btn:hover { color: var(--accent); border-color: var(--accent); }
.icon-btn:disabled { opacity: .4; }
.icon-btn--sm { width: 32px; height: 32px; }
.icon-btn--sm .icon { width: 16px; height: 16px; }

/* ---------- badges, pills, LEDs ---------- */
.led {
  --c: var(--text-3);
  width: 7px; height: 7px; border-radius: 50%; flex: none;
  background: var(--c); box-shadow: 0 0 0 3px color-mix(in srgb, var(--c) 18%, transparent), 0 0 10px color-mix(in srgb, var(--c) 60%, transparent);
}
.badge {
  display: inline-flex; align-items: center; gap: 6px; height: 22px; padding: 0 8px; border-radius: 4px;
  font: 600 11.5px/1 var(--font-mono); letter-spacing: .08em; text-transform: uppercase; white-space: nowrap;
  border: 1px solid var(--line-strong); color: var(--text-2); background: var(--surface-2); vertical-align: middle;
}
.badge--pre { color: var(--accent); border-color: color-mix(in srgb, var(--accent) 45%, transparent); background: var(--accent-soft); }
.badge--sim { color: var(--unclear); border-color: color-mix(in srgb, var(--unclear) 45%, transparent); background: var(--unclear-soft); }
.badge--cache { color: var(--clear); border-color: color-mix(in srgb, var(--clear) 45%, transparent); background: var(--clear-soft); }

.pill {
  display: inline-flex; align-items: center; gap: 6px; height: 24px; padding: 0 10px; border-radius: 999px;
  font: 600 11.5px/1 var(--font-mono); letter-spacing: .08em; text-transform: uppercase; white-space: nowrap;
  border: 1px solid currentColor;
}
.pill::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: currentColor; }
.pill--major { color: var(--major); background: var(--major-soft); }
.pill--minor { color: var(--minor); background: var(--minor-soft); }
.pill--pending { color: var(--text-3); background: transparent; border-style: dashed; }
.pill--pending::before { animation: blink 1s steps(2) infinite; }

.notice {
  display: flex; gap: 10px; align-items: flex-start; padding: 10px 12px; border-radius: var(--radius-sm);
  font-size: 14px; border: 1px solid var(--line-strong); background: var(--surface-2); color: var(--text-2);
}
.notice--error { border-color: color-mix(in srgb, var(--major) 45%, transparent); background: var(--major-soft); color: var(--text); }
.notice--warn { border-color: color-mix(in srgb, var(--minor) 45%, transparent); background: var(--minor-soft); color: var(--text); }

@keyframes blink { 50% { opacity: .2; } }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: .35; } }
@keyframes rise { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }