/* styles/components.css - redesign shared components (scoped under .ui). Loaded after system.css. */

/* Callout / alert (minimal left rule, no fill). Variant color via --co. */
.ui .callout {
  border-left: 2px solid var(--co, var(--accent));
  padding: 2px 0 2px 16px;
  margin: 0 0 var(--sp-4);
}
.ui .callout .callout-label {
  font: 600 10.5px/1 var(--font-sans);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--co-label, var(--accent-link));
}
.ui .callout .callout-body {
  font: 400 13.5px/1.6 var(--font-sans);
  color: var(--text-body);
  max-width: 60ch;
  margin-top: 6px;
}
.ui .callout.warning { --co: var(--warning); --co-label: var(--warning-text); }
.ui .callout.error   { --co: #e06a6a;        --co-label: #f0a0a0; }

/* Code / pseudocode block (dark inset). No syntax highlighting: all code is one uniform
   color. The .kw/.fn/.cm spans are kept for markup compatibility but are not colored.
   Only the line-number gutter is dimmed. */
.ui .codeblock {
  width: fit-content;
  max-width: 100%;
  margin: 0 0 var(--sp-5);
  font: 500 12.5px/1.85 var(--font-mono);
  color: var(--text-2);
  background: #060607;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-lg);
  padding: 16px 18px;
  overflow-x: auto;
}
/* Reset the inline-code styling (system.css .ui code) that would otherwise tint the
   whole block periwinkle with an accent background. */
.ui .codeblock code {
  color: inherit;
  background: none;
  padding: 0;
  border-radius: 0;
  font-size: inherit;
}
.ui .codeblock .ln { display: inline-block; width: 20px; color: var(--text-muted); user-select: none; }
.ui .codeblock .kw,
.ui .codeblock .fn,
.ui .codeblock .cm { color: inherit; font-style: normal; }

/* Data table (row hairlines). */
.ui .data-table { border-collapse: collapse; width: 100%; max-width: 620px; margin: 0 0 var(--sp-5); }
.ui .data-table th {
  font: 600 10px/1 var(--font-mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  text-align: right;
  padding: 0 0 11px;
  border-bottom: 1px solid var(--hairline-strong);
}
.ui .data-table th:first-child { text-align: left; }
.ui .data-table td {
  font: 400 13px/1 var(--font-sans);
  color: var(--text-2);
  text-align: right;
  padding: 11px 0;
  border-bottom: 1px solid var(--hairline);
}
.ui .data-table td:first-child { text-align: left; color: var(--text-2); font-weight: 500; }
.ui .data-table td.num { font-family: var(--font-mono); font-weight: 500; font-variant-numeric: tabular-nums; }
.ui .data-table th + th, .ui .data-table td + td { padding-left: 26px; }
.ui .data-table tr:last-child td { border-bottom: 0; }
.ui .data-table .best td { color: var(--text-2); }
.ui .data-table .best .hl { color: var(--accent); }

/* Tooltip (card default; .pill for a single value). JS positions it. */
.ui .tooltip {
  display: inline-block;
  background: #141418;
  border: 1px solid rgba(255, 255, 255, 0.10);
  border-radius: var(--radius-md);
  padding: 9px 11px;
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.04) inset, 0 10px 28px -10px rgba(0, 0, 0, 0.8);
  font-family: var(--font-sans);
}
.ui .tooltip .tt-title { font: 600 11px/1 var(--font-sans); color: #ededf0; margin-bottom: 7px; }
.ui .tooltip .tt-row { display: flex; justify-content: space-between; gap: 18px; font: 500 11.5px/1.5 var(--font-mono); }
.ui .tooltip .tt-row span { color: var(--text-muted); }
.ui .tooltip .tt-value { color: var(--accent); font-weight: 500; }
.ui .tooltip.pill {
  padding: 6px 9px;
  background: #06070a;
  border-color: rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-sm);
  box-shadow: 0 6px 18px -8px rgba(0, 0, 0, 0.8);
  font: 500 11.5px/1 var(--font-mono);
  color: var(--text-2);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

/* Display math wrapper (left rule, left-aligned, numbered) around MathJax output. */
.ui .math-display {
  position: relative;
  border-left: 2px solid var(--accent);
  padding: 13px 56px 13px 22px;
  margin: 20px 0;
  text-align: left;
  color: #e4e6ea;            /* MathJax SVG uses currentColor */
}
.ui .math-display .eq-num {
  position: absolute;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  font: 500 12px/1 var(--font-mono);
  color: var(--text-muted);
}
/* keep MathJax display output left-aligned inside the ruled block (MathJax centers by default) */
.ui .math-display mjx-container[display] { text-align: left !important; margin: 0 !important; }

/* Worked numeric block (matrices / step values). */
.ui .worked {
  display: inline-flex;
  align-items: center;
  gap: 18px;
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: 9px;
  padding: 14px 18px;
  font: 500 13px/1.6 var(--font-mono);
  color: var(--text-2);
  font-variant-numeric: tabular-nums;
}
.ui .worked .mat { border-left: 1.5px solid rgba(255, 255, 255, 0.25); border-right: 1.5px solid rgba(255, 255, 255, 0.25); padding: 2px 12px; }
.ui .worked .hl { color: var(--accent); }

/* Figure frame + caption. The figure carries its own edge (no-frames page, framed instrument). */
.ui .figure-frame {
  background: radial-gradient(120% 120% at 50% 45%, #0e0f15, #070709);
  border: 1px solid var(--figure-edge);
  border-radius: var(--radius-md);
  overflow: hidden;
}
.ui .figcap {
  font: 500 10.5px/1.3 var(--font-mono);
  letter-spacing: 0.04em;
  color: var(--text-muted);
  margin-top: 8px;
}
.ui .figcap b { color: var(--text-2); font-weight: 600; }

/* ===== Controls (minimal / underline) ===== */

/* Buttons */
.ui .btn {
  font: 500 13px/1 var(--font-sans);
  color: var(--accent);
  background: none;
  border: 0;
  border-bottom: 1px solid var(--accent);
  padding: 6px 1px;
  cursor: pointer;
}
.ui .btn.secondary { color: var(--text-2); border-bottom-color: var(--hairline-strong); }
.ui .btn:hover { color: var(--accent-link); }
.ui .btn.secondary:hover { color: var(--text-2); }

/* Upload: a <label> wrapping a visually-hidden file input (iOS-safe). */
.ui .btn-upload {
  display: inline-block;
  font: 500 13px/1 var(--font-sans);
  color: var(--accent);
  border-bottom: 1px solid var(--accent);
  padding: 6px 1px;
  cursor: pointer;
}
.ui .btn-upload input[type="file"] {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* Focus ring on every interactive control. */
.ui .btn:focus-visible,
.ui .btn-upload:focus-within,
.ui .field select:focus-visible,
.ui .field input:focus-visible,
.ui .tab:focus-visible,
.ui input[type="range"]:focus-visible,
.ui .toggle:focus-visible,
.ui .check:focus-visible {
  outline: var(--focus-ring);
  outline-offset: 3px;
}

/* Field wrapper: a label above a control. */
.ui .field { display: inline-flex; flex-direction: column; gap: 8px; }
.ui .field .field-label {
  font: 600 10.5px/1 var(--font-sans);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-muted);
}

/* Select + text/number input (underline). */
.ui .field select,
.ui .field input[type="text"],
.ui .field input[type="number"] {
  appearance: none;
  -webkit-appearance: none;
  font: 500 13px/1.2 var(--font-sans);
  color: var(--text-2);
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--hairline-strong);
  padding: 6px 2px;
  cursor: pointer;
}
.ui .field select {
  padding-right: 20px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='9' height='6' viewBox='0 0 9 6'%3E%3Cpath d='M1 1l3.5 3.5L8 1' fill='none' stroke='%237a7c84' stroke-width='1.3'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 2px center;
}
.ui .field input { cursor: text; }
.ui .field select:hover, .ui .field input:hover { border-bottom-color: rgba(255, 255, 255, 0.4); }

/* Tabs (one shared pattern; active = .is-active). */
/* Scroll the tab row when it is wider than its container (e.g. Fourier's five interpretation
   tabs on a phone) instead of letting it bleed off the side. Inert when the tabs already fit. */
.ui .tabs { display: flex; gap: 18px; max-width: 100%; overflow-x: auto; scrollbar-width: none; -webkit-overflow-scrolling: touch; }
.ui .tabs::-webkit-scrollbar { display: none; }
.ui .tab {
  flex: 0 0 auto;
  white-space: nowrap;
  font: 500 13px/1 var(--font-sans);
  color: var(--text-muted);
  background: none;
  border: 0;
  padding: 0 0 7px;
  border-bottom: 1.5px solid transparent;
  cursor: pointer;
}
.ui .tab:hover { color: var(--text-2); }
.ui .tab.is-active { color: #ececf0; border-bottom-color: var(--accent); }
/* Tabs are the single "pick one of N" control (used for both view switches and
   compact toggles); there is no separate segmented control. */

/* Range slider. (Progress fill is added per-page via JS if needed.) */
.ui input[type="range"] {
  appearance: none;
  -webkit-appearance: none;
  width: 140px;
  height: 2px;
  background: rgba(255, 255, 255, 0.16);
  border-radius: 2px;
  cursor: pointer;
}
.ui input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 13px; height: 13px; border-radius: 50%;
  background: var(--accent); border: none; cursor: pointer;
}
.ui input[type="range"]::-moz-range-thumb {
  width: 13px; height: 13px; border-radius: 50%;
  background: var(--accent); border: none; cursor: pointer;
}

/* Toggle switch (a checkbox styled as a pill). */
.ui .toggle {
  appearance: none;
  -webkit-appearance: none;
  width: 30px; height: 17px;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.12);
  position: relative;
  cursor: pointer;
}
.ui .toggle::after {
  content: '';
  position: absolute; top: 2px; left: 2px;
  width: 13px; height: 13px; border-radius: 50%;
  background: #e9e9ee;
  transition: left var(--dur-hover) var(--ease-out);
}
.ui .toggle:checked { background: rgba(var(--accent-rgb), 0.55); }
.ui .toggle:checked::after { left: 15px; }

/* Checkbox. */
.ui .check {
  appearance: none;
  -webkit-appearance: none;
  width: 15px; height: 15px;
  border: 1.5px solid var(--accent);
  border-radius: var(--radius-xs);
  position: relative;
  cursor: pointer;
}
.ui .check:checked::after {
  content: '';
  position: absolute; inset: 3px;
  background: var(--accent);
  border-radius: 1px;
}
.ui .control-row { display: inline-flex; align-items: center; gap: 9px; font: 500 13px/1 var(--font-sans); color: var(--text-2); }

/* ===== Control-management patterns (chosen per page; tabbed is the default for dense sets) ===== */

/* A. Grouped grid: labelled groups in an auto-fit grid. */
.ui .control-groups { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 24px 30px; }
.ui .control-group { display: flex; flex-direction: column; gap: 11px; }
.ui .control-group > .group-label {
  font: 600 9.5px/1 var(--font-sans); letter-spacing: 0.14em; text-transform: uppercase; color: var(--text-muted);
  padding-bottom: 8px; border-bottom: 1px solid var(--surface-border);
}

/* B. Primary + "more" disclosure. */
.ui .control-primary { display: flex; gap: 30px; flex-wrap: wrap; align-items: flex-end; }
.ui .control-more { display: block; margin-top: 16px; }
.ui .control-more-toggle { font: 500 12px/1 var(--font-sans); color: var(--accent-link); background: none; border: 0; cursor: pointer; padding: 0; }
.ui .control-advanced { margin-top: 14px; padding-top: 14px; border-top: 1px dashed rgba(255, 255, 255, 0.1); display: flex; gap: 30px; flex-wrap: wrap; align-items: center; }
.ui .control-more[hidden] .control-advanced { display: none; }

/* C. Tabbed groups (default for dense control sets). */
.ui .control-tabs { display: inline-flex; gap: 18px; margin-bottom: 16px; }

/* ===== Mobile / touch: enlarge tap targets to >= 44px without changing the look ===== */
@media (pointer: coarse) {
  .ui .btn,
  .ui .btn-upload,
  .ui .field select,
  .ui .field input,
  .ui .tab,
  .ui .toggle,
  .ui .check {
    position: relative;
  }
  .ui .btn::before,
  .ui .btn-upload::before,
  .ui .field select::before,
  .ui .tab::before,
  .ui .toggle::before,
  .ui .check::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    min-width: 44px;
    min-height: 44px;
    width: 100%;
    height: 100%;
  }
}

/* ===== Composites ===== */

/* Home index (single-column editorial directory). */
.ui .home-index .index-list { margin-top: 34px; }
.ui .home-index .index-row {
  display: flex;
  align-items: baseline;
  gap: 20px;
  padding: 17px 6px 17px 0;
  border: 0;
  border-top: 1px solid var(--hairline);
  text-decoration: none;
}
.ui .home-index .index-row:last-child { border-bottom: 1px solid var(--hairline); }
.ui .home-index .index-num { font: 500 12px/1.3 var(--font-mono); color: var(--text-muted); flex-shrink: 0; width: 22px; }
.ui .home-index .index-body { flex: 1; min-width: 0; }
.ui .home-index .index-title { font: 600 16px/1.3 var(--font-sans); letter-spacing: -0.01em; color: var(--text-2); }
.ui .home-index .index-desc { font: 400 13px/1.5 var(--font-sans); color: var(--text-muted); margin-top: 3px; max-width: 62ch; }
.ui .home-index .index-arrow { font: 500 14px/1 var(--font-mono); color: var(--text-muted); flex-shrink: 0; align-self: center; transition: transform var(--dur-hover) var(--ease-out), color var(--dur-hover); }
.ui .home-index .index-row:hover .index-title { color: var(--text); }
.ui .home-index .index-row:hover .index-num,
.ui .home-index .index-row:hover .index-arrow { color: var(--accent); }
.ui .home-index .index-row:hover .index-arrow { transform: translateX(3px); }

/* Footer */
.ui .site-footer { margin-top: 30px; padding-top: 18px; border-top: 1px solid var(--hairline); display: flex; flex-direction: column; align-items: flex-end; gap: 10px; }
.ui .site-footer .footer-row { display: flex; align-items: center; gap: 22px; }
.ui .site-footer .footer-utils { display: inline-flex; align-items: center; gap: 12px; }
.ui .site-footer .footer-settings,
.ui .site-footer .footer-glossary { display: inline-flex; align-items: center; color: var(--text-muted); border-bottom: 0; transition: color var(--dur-hover, 140ms) ease; }
.ui .site-footer .footer-settings:hover,
.ui .site-footer .footer-glossary:hover { color: var(--text); }
/* Hidden "tribute" tag: always rendered in Monocraft. In the resting "tribute" state it is
   painted in the page background so it is effectively invisible; hovering reveals it faintly.
   Once toggled on ("RIP Ari") it stays accent-colored regardless of hover. */
.ui .site-footer .footer-tribute { font-family: 'Monocraft', ui-monospace, monospace; font-size: 10px; line-height: 1; letter-spacing: 0.04em; color: var(--bg); background: none; border: 0; padding: 2px; cursor: pointer; transition: color 0.15s ease; }
/* Reveal on hover only on devices that truly hover, so a tap on touch never makes it
   visible. On phones it stays background-colored (invisible) but remains tappable. */
@media (hover: hover) { .ui .site-footer .footer-tribute:hover { color: #3a3b42; } }
.ui .site-footer .footer-tribute[aria-pressed="true"] { color: var(--accent-link); }
.ui .site-footer .credit { font: 400 12px/1 var(--font-sans); color: var(--text-muted); }
.ui .site-footer .credit a { color: inherit; border-bottom: 0; }
.ui .site-footer .credit a:hover { color: var(--text); text-decoration: underline; }
.ui .site-footer .meta { font: 500 11px/1 var(--font-mono); letter-spacing: 0.08em; color: var(--text-muted); }

/* Paired-visualization layout: two figures side by side, controls below. */
.ui .viz-pair { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.ui .viz-controls { margin-top: 18px; padding-top: 18px; border-top: 1px solid var(--hairline); }
@media (max-width: 640px) {
  .ui .viz-pair { grid-template-columns: 1fr; }
}

/* Walkthrough player (stacked). JS wires play/scrub/step nav at migration. */
.ui .player .video {
  position: relative;
  aspect-ratio: 16/9;
  background: radial-gradient(120% 120% at 50% 40%, #0f1016, #060608);
  border: 1px solid rgba(255, 255, 255, 0.10);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.ui .player .video > svg { position: absolute; inset: 0; width: 100%; height: 100%; }
.ui .player .video-title { position: absolute; left: 16px; top: 14px; font: 500 11px/1.3 var(--font-mono); color: rgba(255, 255, 255, 0.5); }
.ui .player .video-title b { display: block; font: 600 13px/1.4 var(--font-sans); color: rgba(255, 255, 255, 0.85); letter-spacing: -0.01em; margin-top: 3px; }
.ui .player .big-play { position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%); width: 58px; height: 58px; border-radius: 50%; background: rgba(8, 8, 12, 0.55); -webkit-backdrop-filter: blur(4px); backdrop-filter: blur(4px); border: 1px solid rgba(255, 255, 255, 0.18); display: flex; align-items: center; justify-content: center; }
.ui .player .big-play::after { content: ''; border-left: 15px solid var(--accent); border-top: 9px solid transparent; border-bottom: 9px solid transparent; margin-left: 4px; }

.ui .player .scrub { display: flex; align-items: center; gap: 14px; margin-top: 16px; }
.ui .player .scrub-play { width: 30px; height: 30px; border-radius: 50%; border: 1px solid rgba(255, 255, 255, 0.16); background: rgba(255, 255, 255, 0.04); flex-shrink: 0; cursor: pointer; display: inline-flex; align-items: center; justify-content: center; }
.ui .player .scrub-play::after { content: ''; border-left: 9px solid #e7e8ec; border-top: 5.5px solid transparent; border-bottom: 5.5px solid transparent; margin-left: 2px; }
.ui .player .scrub-track { position: relative; flex: 1; height: 4px; background: rgba(255, 255, 255, 0.12); border-radius: 3px; }
.ui .player .scrub-fill { position: absolute; left: 0; top: 0; bottom: 0; width: 34%; background: var(--accent); border-radius: 3px; }
.ui .player .scrub-tick { position: absolute; top: -3px; width: 2px; height: 10px; background: rgba(255, 255, 255, 0.22); border-radius: 1px; }
.ui .player .scrub-head { position: absolute; left: 34%; top: 50%; width: 12px; height: 12px; border-radius: 50%; background: var(--accent); border: 2px solid var(--bg); transform: translate(-50%, -50%); }
.ui .player .scrub-time { font: 500 12px/1 var(--font-mono); color: var(--text-body); font-variant-numeric: tabular-nums; flex-shrink: 0; }

.ui .player .step-bar { display: flex; align-items: flex-start; justify-content: space-between; margin-top: 20px; padding-top: 16px; border-top: 1px solid var(--hairline); }
.ui .player .step-k { font: 600 10.5px/1 var(--font-mono); letter-spacing: 0.16em; color: var(--accent); }
.ui .player .step-trigger { display: inline-flex; align-items: center; gap: 9px; cursor: pointer; margin-top: 5px; }
.ui .player .step-title { font: 600 16px/1.3 var(--font-sans); color: #ededf0; letter-spacing: -0.01em; }
.ui .player .step-chev { color: var(--text-muted); font-size: 11px; }
.ui .player .step-menu-wrap { position: relative; }
.ui .player .step-menu { position: absolute; top: calc(100% + 8px); left: 0; width: 320px; background: var(--surface-strong); border: 1px solid var(--surface-strong-border); border-radius: var(--radius-lg); padding: 6px; box-shadow: 0 16px 40px -16px rgba(0, 0, 0, 0.8); z-index: 5; }
.ui .player .step-item { display: flex; align-items: center; gap: 11px; padding: 9px 10px; border-radius: var(--radius-sm); cursor: pointer; }
.ui .player .step-item .step-n { font: 500 11px/1 var(--font-mono); color: var(--text-muted); width: 16px; flex-shrink: 0; }
.ui .player .step-item .step-l { font: 500 13px/1.3 var(--font-sans); color: var(--text-muted); }
.ui .player .step-item:hover { background: rgba(255, 255, 255, 0.04); }
.ui .player .step-item.current { background: var(--accent-muted); color: #ededf0; }
.ui .player .step-item.current .step-l { color: #ededf0; }
.ui .player .step-item.current .step-n { color: var(--accent); }
.ui .player .step-item.done .step-l { color: var(--text-body); }
.ui .player .step-nav { display: flex; gap: 10px; }
.ui .player .step-nav .btn { font: 500 12.5px/1 var(--font-sans); color: var(--text-2); background: rgba(255, 255, 255, 0.04); border: 1px solid rgba(255, 255, 255, 0.12); border-radius: var(--radius-md); padding: 9px 13px; cursor: pointer; }
.ui .player .transcript { margin-top: 18px; font: 400 14px/1.7 var(--font-sans); color: var(--text-body); max-width: 64ch; }

/* Section-outline rail re-skin (mono-numbered). Overrides section-outline.css only under
   .ui, so the eight live pages keep their current rail until they opt in. */
.ui .section-outline-list a {
  display: flex;
  gap: 10px;
  align-items: baseline;
  padding: 6px 10px;
  border: 0;
  border-left: 2px solid transparent;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-muted);
  font: 500 13px/1.3 var(--font-sans);
  text-decoration: none;
}
.ui .section-outline-list a .rail-n { font: 500 10.5px/1.3 var(--font-mono); color: var(--text-muted); }
.ui .section-outline-list a:hover { color: var(--text-2); background: rgba(255, 255, 255, 0.03); }
.ui .section-outline-list a.active { color: var(--text); border-left-color: var(--accent); background: var(--accent-muted); font-weight: 600; }
.ui .section-outline-list a.active .rail-n { color: var(--accent); }
/* Home link at the top of the rail: a back-arrow stands in for the mono number. */
.ui .section-outline-list .rail-home-item { margin-bottom: 12px; }
.ui .section-outline-list .rail-home .rail-arrow { font: 500 13px/1.3 var(--font-mono); color: var(--text-muted); }
.ui .section-outline-list .rail-home:hover .rail-arrow { color: var(--accent); }