styles.css

/* Code Tutor - visual design system layered on /kit/theme.css.
   The kit primitives stay underneath; this adds hierarchy: a type scale,
   color-coded categories, icon tiles, level theming, a progress ring, finding
   cards and an inline code viewer. Colors use color-mix() (Chromium canvas) so
   one accent hex drives stripe + tint + text. */

:root {
  --fs-hero: 1.4rem;
  --fs-h: 1rem;
  --fs-body: 0.875rem;
  --fs-sm: 0.78rem;
  --fs-xs: 0.7rem;
  --fs-label: 0.66rem;
  --fs-code: 0.75rem;

  --r-lg: 12px;
  --r-md: 9px;
  --r-sm: 6px;

  /* Level palette. Semantic kit tokens (not raw hex) so each hue tracks the
     user's theme: the injected values darken for contrast on light and brighten
     on dark. Wizard uses the injected purple data token. */
  --lvl-eli5: var(--ck-success);
  --lvl-curious: var(--ck-accent);
  --lvl-engineer: var(--ck-attention);
  --lvl-wizard: var(--color-data-purple-emphasis, #8250df);

  /* quality palette */
  --q-good: var(--ck-success);
  --q-ok: var(--ck-attention);
  --q-bad: var(--ck-danger);
}

body { padding: 0; }
.cs-app { padding: 14px 14px 28px; }

/* ---- generic tinted icon tile ------------------------------------------- */
.cs-tile {
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: var(--r-md); flex: none;
  color: var(--accent, var(--ck-accent));
  background: color-mix(in srgb, var(--accent, var(--ck-accent)) 16%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent, var(--ck-accent)) 35%, transparent);
}
.cs-tile-lg { width: 40px; height: 40px; }
.cs-tile-md { width: 30px; height: 30px; }
.cs-tile-sm { width: 22px; height: 22px; border-radius: var(--r-sm); }

/* ---- hero ---------------------------------------------------------------- */
.cs-hero {
  position: relative; overflow: hidden;
  border: 1px solid var(--ck-border); border-radius: var(--r-lg);
  background:
    radial-gradient(120% 140% at 0% 0%, color-mix(in srgb, var(--ck-accent) 22%, transparent), transparent 60%),
    radial-gradient(120% 140% at 100% 0%, color-mix(in srgb, var(--lvl-wizard) 20%, transparent), transparent 55%),
    var(--ck-bg-muted);
  padding: 14px; margin-bottom: 12px;
}
.cs-hero-top { display: flex; align-items: center; gap: 11px; }
.cs-hero-title { display: flex; flex-direction: column; gap: 1px; min-width: 0; flex: 1; }
.cs-hero-title h1 { margin: 0; font-size: var(--fs-hero); line-height: 1.1; letter-spacing: -0.01em; }
.cs-hero-tag { font-size: var(--fs-sm); color: var(--ck-muted); }
.cs-hero-live { align-self: flex-start; }

/* ---- progress ring ------------------------------------------------------- */
.cs-ring { position: relative; flex: none; width: 58px; height: 58px; }
.cs-ring svg { transform: rotate(-90deg); display: block; }
.cs-ring-track { stroke: color-mix(in srgb, var(--ck-fg) 12%, transparent); }
.cs-ring-val { stroke: var(--ck-success); stroke-linecap: round; transition: stroke-dashoffset 0.4s ease; }
.cs-ring-label { position: absolute; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; }
.cs-ring-pct { font-size: 0.85rem; font-weight: 700; line-height: 1; }
.cs-ring-sub { font-size: 9px; color: var(--ck-muted); margin-top: 1px; }

/* ---- codebase card ------------------------------------------------------- */
.cs-codebase { display: flex; gap: 10px; align-items: flex-start; margin-bottom: 12px; }
.cs-cb-body { min-width: 0; flex: 1; }
.cs-cb-label { font-weight: var(--ck-fw-semibold); font-size: var(--fs-h); display: flex; align-items: center; gap: 6px; }
.cs-cb-summary { margin-top: 3px; color: var(--ck-muted); font-size: var(--fs-sm); line-height: 1.5; }
.cs-meta { display: flex; flex-wrap: wrap; gap: 5px; align-items: center; margin-top: 8px; }
.cs-chip {
  display: inline-flex; align-items: center; gap: 4px;
  font-size: var(--fs-xs); padding: 2px 8px; border-radius: 999px;
  border: 1px solid var(--ck-border); color: var(--ck-muted); background: var(--ck-bg-inset);
}
button.cs-chip { cursor: pointer; font-family: var(--ck-mono); }
button.cs-chip:hover { border-color: var(--ck-accent); color: var(--ck-fg); }

/* ---- reading-level control ---------------------------------------------- */
.cs-level {
  border: 1px solid var(--ck-border); border-radius: var(--r-md);
  background: var(--ck-bg-muted); padding: 10px 12px; margin-bottom: 12px;
  --accent: var(--lvl);
}
.cs-level-top { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin-bottom: 8px; }
.cs-level-cur { display: flex; align-items: center; gap: 7px; }
.cs-level-name { font-weight: var(--ck-fw-semibold); color: var(--lvl); font-size: var(--fs-body); }
.cs-level-tag { color: var(--ck-muted); font-size: var(--fs-xs); }

.cs-slider { display: flex; flex-direction: column; gap: 5px; }
.cs-slider input[type="range"] {
  -webkit-appearance: none; appearance: none; width: 100%; height: 7px;
  border-radius: 999px; margin: 4px 0 2px; cursor: pointer;
  background: linear-gradient(90deg, var(--lvl) 0%, var(--lvl) var(--cs-fill, 50%), var(--ck-bg-inset) var(--cs-fill, 50%));
  border: 1px solid var(--ck-border);
}
.cs-slider input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none; width: 18px; height: 18px; border-radius: 50%;
  background: var(--ck-bg); border: 3px solid var(--lvl); cursor: pointer;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.28);
}
.cs-slider input[type="range"]::-moz-range-thumb {
  width: 18px; height: 18px; border-radius: 50%; background: var(--ck-bg); border: 3px solid var(--lvl); cursor: pointer;
}
.cs-slider input[type="range"]:focus-visible { outline: 2px solid var(--ck-focus); outline-offset: 2px; }
.cs-scale { display: flex; justify-content: space-between; }
.cs-tick {
  font-size: 10px; color: var(--ck-muted);
  display: flex; align-items: center; gap: 3px;
  background: none; border: 0; padding: 4px 6px; margin: 0 -6px;
  cursor: pointer; border-radius: var(--r-sm); font-family: inherit;
  transition: color 0.12s ease, background 0.12s ease;
}
.cs-tick:first-child { margin-left: -6px; }
.cs-tick:last-child { margin-right: -6px; }
.cs-tick:hover { color: var(--ck-fg); background: var(--ck-bg-muted); }
.cs-tick:focus-visible { outline: 2px solid var(--ck-accent); outline-offset: 1px; }
.cs-tick-on { color: var(--lvl); font-weight: var(--ck-fw-semibold); }
.cs-tick-on:hover { color: var(--lvl); }
/* compact variant (sticky bar): thinner track, smaller thumb, no labels */
.cs-slider.compact input[type="range"] { height: 5px; margin: 0; }
.cs-slider.compact input[type="range"]::-webkit-slider-thumb { width: 14px; height: 14px; border-width: 2px; }
.cs-slider.compact input[type="range"]::-moz-range-thumb { width: 14px; height: 14px; border-width: 2px; }

/* ---- sticky compact level bar -------------------------------------------- */
.cs-sticky-level {
  position: fixed; top: 0; left: 0; right: 0; z-index: 30;
  display: flex; align-items: center; gap: 12px;
  padding: 9px 16px;
  background: color-mix(in srgb, var(--ck-bg-muted) 94%, transparent);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--ck-border);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.18);
  transform: translateY(-110%); opacity: 0; visibility: hidden;
  transition: transform 0.18s ease, opacity 0.18s ease, visibility 0.18s;
  --lvl: var(--ck-accent);
}
.cs-sticky-level.stuck { transform: translateY(0); opacity: 1; visibility: visible; }
.cs-sticky-cur { display: inline-flex; align-items: center; gap: 6px; flex: none; color: var(--lvl); font-weight: var(--ck-fw-semibold); font-size: var(--fs-sm); min-width: 84px; }
.cs-sticky-slider { flex: 1; }
.cs-level-sentinel { height: 1px; margin: 0; padding: 0; }

/* ---- tabs ---------------------------------------------------------------- */
.cs-tabbar { display: flex; gap: 4px; margin-bottom: 14px; border-bottom: 1px solid var(--ck-border); }
.cs-tab {
  display: inline-flex; align-items: center; gap: 6px; font: inherit; font-size: var(--fs-sm);
  color: var(--ck-muted); background: transparent; border: 0; cursor: pointer;
  padding: 8px 10px; border-bottom: 2px solid transparent; margin-bottom: -1px;
}
.cs-tab:hover { color: var(--ck-fg); }
.cs-tab[aria-selected="true"] { color: var(--ck-fg); border-bottom-color: var(--ck-accent); }
.cs-tab-n { font-size: 10px; font-weight: 700; padding: 0 5px; border-radius: 999px; background: var(--ck-bg-inset); border: 1px solid var(--ck-border); }
.cs-tab[aria-selected="true"] .cs-tab-n { background: color-mix(in srgb, var(--ck-accent) 22%, transparent); border-color: transparent; color: var(--ck-fg); }

/* ---- filters ------------------------------------------------------------- */
.cs-toolbar { display: flex; flex-direction: column; gap: 12px; margin-bottom: 14px; }
.cs-field { display: flex; flex-direction: column; gap: 6px; }
.cs-field-label {
  font-size: var(--fs-label); text-transform: uppercase; letter-spacing: 0.05em;
  color: var(--ck-muted); font-weight: var(--ck-fw-semibold);
}
.cs-field .ck-select { width: 100%; }
.cs-statusbar { display: flex; flex-wrap: wrap; gap: 6px; }
.cs-stat {
  display: inline-flex; align-items: center; gap: 5px; font: inherit; font-size: var(--fs-xs);
  padding: 5px 10px; border-radius: 999px; cursor: pointer; white-space: nowrap;
  border: 1px solid var(--ck-border); background: var(--ck-bg-inset); color: var(--ck-muted);
}
.cs-stat:hover { color: var(--ck-fg); border-color: color-mix(in srgb, var(--accent) 50%, var(--ck-border)); }
.cs-stat .cs-stat-n {
  font-weight: 700; font-size: 10px; min-width: 16px; text-align: center;
  padding: 0 5px; border-radius: 999px; background: color-mix(in srgb, var(--ck-fg) 8%, transparent); color: var(--ck-muted);
}
.cs-stat.on { color: var(--accent); background: color-mix(in srgb, var(--accent) 15%, transparent); border-color: color-mix(in srgb, var(--accent) 45%, transparent); }
.cs-stat.on .cs-stat-n { color: var(--accent); background: color-mix(in srgb, var(--accent) 22%, transparent); }

/* ---- topic list / cards -------------------------------------------------- */
.cs-list { display: flex; flex-direction: column; gap: 10px; }
.cs-topic {
  --accent: var(--ck-accent);
  position: relative; overflow: hidden; padding: 0;
  border: 1px solid var(--ck-border); border-radius: var(--r-md); background: var(--ck-bg-muted);
}
.cs-topic::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 3px; background: var(--accent); opacity: 0.9; }
.cs-topic-head {
  display: flex; align-items: flex-start; gap: 11px; width: 100%; text-align: left; cursor: pointer;
  background: transparent; border: 0; color: inherit; font: inherit; padding: 12px 13px 12px 15px;
}
.cs-topic-head:hover { background: color-mix(in srgb, var(--accent) 7%, transparent); }
.cs-topic-main { flex: 1; min-width: 0; }
.cs-topic-title { font-weight: var(--ck-fw-semibold); font-size: var(--fs-h); display: flex; align-items: center; gap: 7px; flex-wrap: wrap; line-height: 1.25; }
.cs-cat-label { font-size: var(--fs-xs); color: var(--accent); font-weight: var(--ck-fw-medium); }
.cs-topic-summary { color: var(--ck-muted); font-size: var(--fs-sm); margin-top: 4px; line-height: 1.45; }
.cs-topic-aside { display: flex; flex-direction: column; align-items: flex-end; gap: 6px; flex: none; }
.cs-chevron { color: var(--ck-muted); margin-top: 4px; flex: none; }

.cs-topic-body { padding: 4px 14px 16px; display: flex; flex-direction: column; gap: 16px; }
.cs-divider { height: 1px; background: var(--ck-border-muted); margin: 0 -14px; }
.cs-section-label {
  font-size: var(--fs-label); text-transform: uppercase; letter-spacing: 0.05em; color: var(--ck-muted);
  font-weight: var(--ck-fw-semibold); margin-bottom: 7px; display: flex; align-items: center; gap: 6px;
}

.cs-prose { white-space: pre-wrap; line-height: 1.6; font-size: var(--fs-body); }
.cs-from-cache { font-size: var(--fs-xs); color: var(--lvl-curious); display: inline-flex; align-items: center; gap: 4px; margin-bottom: 6px; }

.cs-points { margin: 0; padding: 0; list-style: none; display: flex; flex-direction: column; gap: 6px; }
.cs-points li { display: flex; gap: 8px; align-items: flex-start; font-size: var(--fs-body); line-height: 1.45; }
.cs-points .cs-ico { color: var(--ck-success); margin-top: 2px; flex: none; }

/* ---- badges / pills ------------------------------------------------------ */
.cs-pill {
  display: inline-flex; align-items: center; gap: 4px; font-size: var(--fs-xs); font-weight: var(--ck-fw-medium);
  padding: 2px 8px; border-radius: 999px; white-space: nowrap;
  color: var(--accent); background: color-mix(in srgb, var(--accent) 15%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 40%, transparent);
}
.cs-level-chip { display: inline-flex; align-items: center; gap: 4px; font-size: var(--fs-xs); color: var(--lvl); }

/* ---- status picker ------------------------------------------------------- */
.cs-status-row { display: flex; flex-wrap: wrap; gap: 6px; }
.cs-status-btn {
  display: inline-flex; align-items: center; gap: 5px; font: inherit; font-size: var(--fs-xs);
  padding: 5px 9px; border-radius: var(--r-sm); cursor: pointer;
  border: 1px solid var(--ck-border); background: var(--ck-bg-inset); color: var(--ck-muted);
}
.cs-status-btn:hover { color: var(--ck-fg); border-color: var(--accent); }
.cs-status-btn.cs-on { color: var(--accent); background: color-mix(in srgb, var(--accent) 15%, transparent); border-color: color-mix(in srgb, var(--accent) 45%, transparent); }

/* ---- code viewer --------------------------------------------------------- */
.cs-refs { display: flex; flex-direction: column; gap: 8px; }
.cs-ref { border: 1px solid var(--ck-border); border-radius: var(--r-sm); overflow: hidden; background: var(--ck-bg-inset); }
.cs-ref-headrow { display: flex; align-items: stretch; }
.cs-ref-head {
  display: flex; align-items: center; gap: 8px; flex: 1; min-width: 0; text-align: left; cursor: pointer;
  background: transparent; border: 0; color: inherit; font: inherit; padding: 8px 10px;
}
.cs-ref-head:hover { background: color-mix(in srgb, var(--ck-accent) 8%, transparent); }
.cs-ref-path { font-family: var(--ck-mono); font-size: var(--fs-code); word-break: break-all; flex: 1; min-width: 0; }
.cs-ref-line { color: var(--ck-accent); }
.cs-ref-note { color: var(--ck-muted); font-size: var(--fs-xs); padding: 0 10px 8px 32px; line-height: 1.4; }
.cs-lang { font-size: 9px; text-transform: uppercase; letter-spacing: 0.04em; color: var(--ck-muted); border: 1px solid var(--ck-border); border-radius: 4px; padding: 1px 5px; flex: none; }
.cs-ref-copy { color: var(--ck-muted); background: transparent; border: 0; cursor: pointer; padding: 2px 10px; flex: none; display: inline-flex; align-items: center; }
.cs-ref-copy:hover { color: var(--ck-fg); background: color-mix(in srgb, var(--ck-accent) 8%, transparent); }

.cs-code { font-family: var(--ck-mono); font-size: var(--fs-code); line-height: 1.55; overflow: auto; border-top: 1px solid var(--ck-border); max-height: 360px; }
.cs-code-line { display: flex; min-height: 1.55em; }
.cs-code-focus { background: color-mix(in srgb, var(--ck-accent) 12%, transparent); }
.cs-code-gutter {
  user-select: none; text-align: right; padding: 0 10px; min-width: 44px; flex: none;
  color: var(--ck-muted); position: sticky; left: 0; background: var(--ck-bg-inset);
  border-right: 1px solid var(--ck-border-muted);
}
.cs-code-focus .cs-code-gutter { color: var(--ck-accent); background: color-mix(in srgb, var(--ck-accent) 12%, var(--ck-bg-inset)); }
.cs-code-src { padding: 0 12px; white-space: pre; }
.cs-code-foot { font-size: var(--fs-xs); color: var(--ck-muted); padding: 5px 10px; border-top: 1px solid var(--ck-border-muted); }

/* syntax tokens - semantic kit colors so they adapt to light/dark */
.tok-com { color: var(--ck-muted); font-style: italic; }
.tok-str { color: var(--ck-success); }
.tok-kw { color: var(--ck-danger); }
.tok-lit { color: var(--ck-accent); }
.tok-num { color: var(--ck-accent); }
.tok-fn { color: var(--lvl-wizard); }
.tok-type { color: var(--ck-attention); }
.tok-punct { color: color-mix(in srgb, var(--ck-fg) 70%, transparent); }
.tok-text { color: var(--ck-fg); }

/* ---- Q&A ----------------------------------------------------------------- */
.cs-qa { display: flex; flex-direction: column; gap: 8px; }
.cs-q { background: var(--ck-bg-inset); border: 1px solid var(--ck-border-muted); border-radius: var(--r-sm); padding: 9px 11px; }
.cs-q-text { font-weight: var(--ck-fw-medium); display: flex; gap: 7px; align-items: flex-start; font-size: var(--fs-body); }
.cs-q-text .cs-ico { color: var(--ck-accent); margin-top: 2px; flex: none; }
.cs-a-text { margin-top: 7px; padding-top: 7px; border-top: 1px dashed var(--ck-border-muted); white-space: pre-wrap; line-height: 1.55; font-size: var(--fs-body); }
.cs-pending { color: var(--ck-attention); display: inline-flex; align-items: center; gap: 6px; margin-top: 7px; font-size: var(--fs-xs); }
.cs-think-meta { font-variant-numeric: tabular-nums; opacity: 0.8; }
.cs-ask { display: flex; flex-direction: column; gap: 6px; }

/* ---- findings ------------------------------------------------------------ */
.cs-find-group { margin-bottom: 18px; }
.cs-find-ghead { display: flex; align-items: center; gap: 8px; margin-bottom: 10px; }
.cs-find-ghead h3 { margin: 0; font-size: var(--fs-h); }
.cs-count { font-size: var(--fs-xs); color: var(--ck-muted); font-weight: 600; padding: 1px 7px; border-radius: 999px; background: var(--ck-bg-inset); border: 1px solid var(--ck-border); }
.cs-finding {
  --accent: var(--q-ok);
  position: relative; overflow: hidden; display: flex; flex-direction: column; gap: 9px;
  border: 1px solid var(--ck-border); border-radius: var(--r-md); background: var(--ck-bg-muted); padding: 12px 13px 12px 15px;
}
.cs-finding::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 3px; background: var(--accent); }
.cs-finding.good { --accent: var(--q-good); }
.cs-finding.ok { --accent: var(--q-ok); }
.cs-finding.bad { --accent: var(--q-bad); }
.cs-finding-head { display: flex; align-items: flex-start; gap: 10px; }
.cs-finding-title { font-weight: var(--ck-fw-semibold); font-size: var(--fs-body); line-height: 1.3; }
.cs-suggest { border-left: 3px solid var(--ck-accent); padding: 7px 11px; background: var(--ck-bg-inset); border-radius: 0 var(--r-sm) var(--r-sm) 0; font-size: var(--fs-sm); line-height: 1.5; }
.cs-suggest strong { color: var(--ck-accent); }
.cs-fixprompt { font-family: var(--ck-mono); font-size: var(--fs-code); white-space: pre-wrap; background: var(--ck-bg-inset); border: 1px solid var(--ck-border); border-radius: var(--r-sm); padding: 9px 11px; line-height: 1.5; }
.cs-finding-actions { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }
/* "Fix in a new session" is a ghapp:// deep-link anchor styled as a kit button;
   strip the default underline so it reads as a button, not a link. */
.cs-finding-actions a.ck-btn { text-decoration: none; }

/* ---- empty states -------------------------------------------------------- */
.cs-empty { text-align: center; padding: 30px 16px; color: var(--ck-muted); }
.cs-empty .cs-tile { margin: 0 auto 12px; }
.cs-empty h3 { margin: 0 0 5px; color: var(--ck-fg); }
.cs-empty p { margin: 0 auto; max-width: 360px; font-size: var(--fs-sm); line-height: 1.5; }
.cs-prompt { font-family: var(--ck-mono); font-size: var(--fs-code); background: var(--ck-bg-inset); border: 1px solid var(--ck-border); border-radius: var(--r-sm); padding: 9px 11px; display: inline-block; margin-top: 12px; color: var(--ck-fg); }

/* ---- misc ---------------------------------------------------------------- */
.cs-spacer { flex: 1 1 auto; }
.cs-linkbtn { background: transparent; border: 0; color: var(--ck-muted); cursor: pointer; font: inherit; font-size: var(--fs-xs); padding: 3px; display: inline-flex; }
.cs-linkbtn:hover { color: var(--ck-danger); }
.cs-progress-line { display: flex; align-items: center; gap: 8px; font-size: var(--fs-xs); color: var(--ck-muted); }

/* ---- analysis freshness -------------------------------------------------- */
.cs-cb-label { display: flex; align-items: center; gap: 6px; }
.cs-refresh-btn {
  display: inline-flex; align-items: center; justify-content: center; flex: none;
  width: 24px; height: 24px; border-radius: var(--r-sm); cursor: pointer;
  background: var(--ck-bg-inset); border: 1px solid var(--ck-border); color: var(--ck-muted);
}
.cs-refresh-btn:hover { color: var(--ck-fg); border-color: var(--ck-accent); }
.cs-fresh {
  display: flex; align-items: center; gap: 8px; margin: -4px 0 12px;
  padding: 8px 11px; border-radius: var(--r-md); font-size: var(--fs-sm); line-height: 1.4;
  border: 1px solid var(--ck-border);
}
.cs-fresh .cs-spacer, .cs-fresh span { min-width: 0; }
.cs-fresh button { flex: none; margin-left: auto; }
.cs-fresh-stale { border-left: 3px solid var(--ck-attention); background: color-mix(in srgb, var(--ck-attention) 10%, var(--ck-bg-muted)); }
.cs-fresh-stale > .cs-icon, .cs-fresh-stale > svg { color: var(--ck-attention); flex: none; }
.cs-fresh-pending { border-left: 3px solid var(--ck-accent); background: color-mix(in srgb, var(--ck-accent) 10%, var(--ck-bg-muted)); color: var(--ck-muted); }
.cs-fresh-pending > svg { color: var(--ck-accent); flex: none; }