/* ==============================================================
   LOW-LEVEL DESIGN REVISION DASHBOARD — STYLES
   ============================================================== */

:root {
  --bg-dark: #0b0f19;
  --bg-panel: #111827;
  --bg-card: #1f293d;
  --border-color: #2b3648;
  --text-main: #f3f4f6;
  --text-muted: #9ca3af;
  --accent-cyan: #38bdf8;
  --accent-purple: #c084fc;
  --accent-green: #34d399;
  --accent-amber: #fbbf24;
  --accent-red: #f87171;
  --font: 'Inter', system-ui, -apple-system, sans-serif;
}

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

body {
  font-family: var(--font);
  background: var(--bg-dark);
  color: var(--text-main);
  height: 100vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

/* ---------- Header ---------- */
header {
  height: 54px;
  flex: 0 0 54px;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 14px;
  gap: 12px;
  z-index: 30;
}
.logo-section { display: flex; align-items: center; gap: 12px; min-width: 0; }
.logo-badge {
  background: linear-gradient(135deg, var(--accent-purple), #60a5fa);
  color: #fff; font-weight: 700; padding: 4px 8px; border-radius: 6px;
  font-size: 11px; letter-spacing: 0.5px; white-space: nowrap;
}
.title-block { display: flex; flex-direction: column; min-width: 0; }
.app-title { font-size: 14px; font-weight: 700; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.app-tagline { font-size: 11px; color: var(--text-muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 46vw; }
.toolbar { display: flex; align-items: center; gap: 6px; flex-shrink: 0; }
.template-select { width: 230px; height: 30px; font-size: 12px; }

/* ---------- Buttons ---------- */
.btn {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  font-family: var(--font);
  font-size: 12px; font-weight: 600;
  padding: 6px 10px; border-radius: 7px; cursor: pointer;
  transition: background .15s, border-color .15s, transform .05s;
  white-space: nowrap;
}
.btn:hover { background: #2a3752; border-color: #46536b; }
.btn:active { transform: scale(0.97); }
.btn-danger { border-color: #7f1d1d; color: #fca5a5; }
.btn-danger:hover { background: #450a0a; border-color: #b91c1c; }
.btn-mini { padding: 2px 8px; font-size: 11px; }


/* ---------- Modal ---------- */
.modal-overlay {
  position: fixed; inset: 0;
  background: rgba(4, 7, 14, 0.75);
  backdrop-filter: blur(4px);
  display: flex; align-items: center; justify-content: center;
  z-index: 100;
}
.modal-content {
  width: 680px; max-width: 92vw; max-height: 84vh;
  overflow-y: auto;
  background: var(--bg-panel);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 20px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.6);
}
.modal-content h3 { font-size: 15px; margin-bottom: 12px; }
.modal-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.template-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 11px 12px;
  cursor: pointer;
  transition: border-color .15s, transform .1s;
  display: flex; align-items: flex-start; gap: 8px;
  margin-bottom: 8px;
}
.modal-grid .template-card { margin-bottom: 0; }
.template-card:hover { border-color: var(--accent-cyan); transform: translateY(-1px); }
.template-card-main { flex: 1; min-width: 0; }
.template-title { font-size: 13px; font-weight: 700; margin-bottom: 3px; }
.template-desc { font-size: 11px; color: var(--text-muted); line-height: 1.5; }
.template-meta { font-size: 10px; color: #6b7280; margin-top: 5px; }
.diff-badge {
  font-size: 9px; font-weight: 700; padding: 2px 6px; border-radius: 999px;
  vertical-align: middle; margin-left: 4px; text-transform: uppercase; letter-spacing: 0.4px;
}
.diff-easy { background: rgba(52, 211, 153, 0.15); color: var(--accent-green); }
.diff-medium { background: rgba(251, 191, 36, 0.15); color: var(--accent-amber); }
.diff-hard { background: rgba(248, 113, 113, 0.15); color: var(--accent-red); }

/* ---------- Toast ---------- */
.toast {
  position: fixed; bottom: 20px; left: 50%;
  transform: translate(-50%, 20px);
  background: var(--bg-card);
  border: 1px solid var(--accent-green);
  color: var(--text-main);
  font-size: 12.5px; font-weight: 600;
  padding: 9px 16px; border-radius: 9px;
  opacity: 0; pointer-events: none;
  transition: opacity .25s, transform .25s;
  z-index: 200;
}
.toast-show { opacity: 1; transform: translate(-50%, 0); }

/* ---------- Scrollbars ---------- */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: #2b3648; border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: #46536b; }


/* ==============================================================
   LEARNING MODE — Revision / Patterns / Progress
   ============================================================== */
.mode-tabs { display: flex; gap: 4px; background: var(--bg-dark); padding: 3px; border-radius: 9px; border: 1px solid var(--border-color); }
.mode-tab {
  background: none; border: none; color: var(--text-muted);
  font-family: var(--font); font-size: 12.5px; font-weight: 600;
  padding: 6px 13px; border-radius: 7px; cursor: pointer; white-space: nowrap;
  transition: background .15s, color .15s;
}
.mode-tab:hover { color: var(--text-main); }
.mode-active { background: var(--bg-card); color: #fff; box-shadow: 0 1px 4px rgba(0,0,0,.35); }
.learn-hint { font-size: 11px; color: var(--text-muted); white-space: nowrap; }

.learn-root { flex: 1; display: flex; min-height: 0; }
.learn-nav {
  width: 268px; flex: 0 0 268px;
  background: var(--bg-panel); border-right: 1px solid var(--border-color);
  overflow-y: auto; padding: 14px 12px;
}
.learn-main { flex: 1; overflow-y: auto; padding: 26px 34px 80px; }

.nav-head { margin-bottom: 12px; }
.nav-title { font-size: 13px; font-weight: 700; margin-bottom: 6px; }
.nav-overall { display: flex; justify-content: space-between; font-size: 11px; color: var(--text-muted); margin-bottom: 5px; }
.nav-pct { color: var(--accent-green); font-weight: 700; }
.bar { height: 5px; background: var(--bg-dark); border-radius: 3px; overflow: hidden; }
.bar-fill { height: 100%; background: linear-gradient(90deg, var(--accent-cyan), var(--accent-green)); transition: width .3s; }
.nav-search { margin-bottom: 10px; }
.nav-cat {
  display: flex; justify-content: space-between; align-items: center; gap: 6px;
  padding: 7px 9px; border-radius: 7px; cursor: pointer;
  font-size: 12px; color: var(--text-muted);
  transition: background .12s, color .12s;
}
.nav-cat:hover { background: var(--bg-card); color: var(--text-main); }
.nav-cat-active { background: var(--bg-card); color: #fff; font-weight: 600; box-shadow: inset 2px 0 0 var(--accent-cyan); }
.nav-cat-n { font-size: 10px; color: var(--text-muted); background: var(--bg-dark); padding: 1px 7px; border-radius: 999px; flex-shrink: 0; }
.nav-note { font-size: 11px; color: var(--text-muted); line-height: 1.6; margin: 10px 2px; }

.learn-intro { margin-bottom: 22px; max-width: 860px; }
.learn-intro h2 { font-size: 21px; font-weight: 700; margin-bottom: 7px; }
.learn-intro p { font-size: 13px; color: var(--text-muted); line-height: 1.65; }

.concept-group { margin-bottom: 28px; }
.group-title {
  font-size: 11px; font-weight: 700; letter-spacing: 0.9px; text-transform: uppercase;
  color: var(--accent-cyan); margin-bottom: 11px;
  padding-bottom: 6px; border-bottom: 1px solid var(--border-color);
}
.concept-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(310px, 1fr)); gap: 10px; }
.concept-card {
  background: var(--bg-card); border: 1px solid var(--border-color);
  border-radius: 10px; padding: 12px 13px; cursor: pointer;
  transition: border-color .15s, transform .1s;
  display: flex; flex-direction: column; gap: 7px;
}
.concept-card:hover { border-color: var(--accent-cyan); transform: translateY(-1px); }
.cc-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 8px; }
.cc-title { font-size: 13px; font-weight: 700; line-height: 1.35; }
.cc-mastery { font-size: 14px; font-weight: 700; flex-shrink: 0; }
.cc-one { font-size: 11.5px; color: var(--text-muted); line-height: 1.55; }
.cc-one b { color: #cfd6e0; }
.cc-foot { display: flex; gap: 5px; flex-wrap: wrap; margin-top: auto; }
.cc-tag { font-size: 9.5px; font-weight: 600; color: var(--text-muted); background: var(--bg-dark); padding: 2px 7px; border-radius: 999px; }
.cc-pattern { color: var(--accent-purple); background: rgba(192,132,252,0.13); }

/* ---------- concept page ---------- */
.cp { max-width: 880px; }
.cp-back { font-size: 12px; color: var(--text-muted); cursor: pointer; margin-bottom: 16px; display: inline-block; }
.cp-back:hover { color: var(--accent-cyan); }
.cp-header { margin-bottom: 16px; }
.cp-header h1 { font-size: 26px; font-weight: 700; line-height: 1.25; margin-bottom: 10px; }
.cp-one {
  font-size: 15px; line-height: 1.6; color: #dfe4ec;
  padding: 12px 15px; background: var(--bg-panel);
  border-left: 3px solid var(--accent-cyan); border-radius: 0 9px 9px 0;
}
.cp-one b { color: #fff; }

.cp-mastery { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; margin: 16px 0 24px; }
.cp-mastery-label { font-size: 11px; color: var(--text-muted); font-weight: 600; margin-right: 4px; }
.mastery-btn {
  --mc: #6b7280;
  background: none; border: 1px solid var(--border-color); color: var(--text-muted);
  font-family: var(--font); font-size: 11.5px; font-weight: 600;
  padding: 5px 11px; border-radius: 999px; cursor: pointer; transition: all .15s;
}
.mastery-btn:hover { border-color: var(--mc); color: var(--mc); }
.mastery-on { border-color: var(--mc); color: var(--mc); background: color-mix(in srgb, var(--mc) 14%, transparent); }

.cp-sec { margin-bottom: 22px; }
.cp-sec h3 {
  font-size: 11px; font-weight: 700; letter-spacing: 0.9px; text-transform: uppercase;
  color: var(--text-muted); margin-bottom: 9px;
  display: flex; align-items: baseline; gap: 8px;
}
.cp-hint { font-size: 10px; font-weight: 500; text-transform: none; letter-spacing: 0; color: #6b7280; }
.cp-sec p { font-size: 13.5px; line-height: 1.75; color: #d6dbe4; }
.cp-sec p b, .cp-sec li b { color: #fff; }
.cp-sec ul { margin-left: 17px; }
.cp-sec li { font-size: 13px; line-height: 1.7; color: #d6dbe4; margin-bottom: 4px; }
.cp-two { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
@media (max-width: 900px) { .cp-two { grid-template-columns: 1fr; } }
.cp-use, .cp-avoid, .cp-good, .cp-bad, .cp-example {
  background: var(--bg-panel); border: 1px solid var(--border-color);
  border-radius: 10px; padding: 13px 15px;
}
.cp-use { border-left: 3px solid var(--accent-green); }
.cp-avoid { border-left: 3px solid var(--accent-red); }
.cp-good { border-left: 3px solid var(--accent-green); }
.cp-bad { border-left: 3px solid var(--accent-amber); }
.cp-example { border-left: 3px solid var(--accent-purple); }

.cp-flow {
  display: flex; align-items: center; gap: 7px; flex-wrap: wrap;
  margin-top: 13px; padding: 13px; background: var(--bg-dark);
  border: 1px solid var(--border-color); border-radius: 9px;
}
.flow-step {
  background: var(--bg-card); border: 1px solid var(--border-color);
  padding: 6px 11px; border-radius: 7px; font-size: 11.5px; font-weight: 600; color: #dfe4ec;
}
.flow-arrow { color: var(--accent-cyan); font-size: 13px; font-weight: 700; }

.qa { margin-bottom: 8px; border: 1px solid var(--border-color); border-radius: 9px; overflow: hidden; background: var(--bg-panel); }
.qa-q {
  display: flex; gap: 9px; align-items: flex-start;
  padding: 11px 13px; cursor: pointer; font-size: 13px; font-weight: 600; line-height: 1.55;
  transition: background .12s;
}
.qa-q:hover { background: var(--bg-card); }
.qa-mark {
  flex-shrink: 0; width: 19px; height: 19px; border-radius: 5px;
  background: rgba(56,189,248,0.15); color: var(--accent-cyan);
  font-size: 10px; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
}
.qa-mark-a { background: rgba(52,211,153,0.15); color: var(--accent-green); }
.qa-toggle { margin-left: auto; font-size: 10px; color: var(--text-muted); font-weight: 600; flex-shrink: 0; }
.qa-a {
  display: flex; gap: 9px; align-items: flex-start;
  padding: 0 13px 13px 13px; font-size: 12.5px; line-height: 1.7; color: #cfd6e0;
}
.qa-a b { color: #fff; }

.chip-row { display: flex; gap: 6px; flex-wrap: wrap; }
.chip {
  background: var(--bg-card); border: 1px solid var(--border-color);
  padding: 5px 11px; border-radius: 999px; font-size: 11.5px; font-weight: 600;
  cursor: pointer; transition: all .15s; color: var(--text-muted);
}
.chip:hover { border-color: var(--accent-cyan); color: #fff; }
.chip-problem:hover { border-color: var(--accent-green); }

/* ---------- patterns extras ---------- */
.pattern-problems { display: flex; flex-direction: column; gap: 6px; }
.pp-row {
  display: flex; align-items: center; gap: 12px;
  background: var(--bg-card); border: 1px solid var(--border-color);
  border-radius: 9px; padding: 10px 13px; cursor: pointer; transition: border-color .15s;
}
.pp-row:hover { border-color: var(--accent-green); }
.pp-title { font-size: 12.5px; font-weight: 700; min-width: 190px; }
.pp-pats { display: flex; gap: 4px; flex-wrap: wrap; }

/* ---------- progress ---------- */
.prog-row {
  display: flex; align-items: center; gap: 12px;
  padding: 9px 11px; border-radius: 9px; cursor: pointer;
  background: var(--bg-card); border: 1px solid var(--border-color); margin-bottom: 6px;
  transition: border-color .15s;
}
.prog-row:hover { border-color: var(--accent-cyan); }
.prog-name { font-size: 12.5px; font-weight: 600; width: 240px; flex-shrink: 0; }
.prog-bar { flex: 1; height: 7px; background: var(--bg-dark); border-radius: 4px; overflow: hidden; }
.prog-fill { height: 100%; border-radius: 4px; transition: width .3s; }
.prog-pct { font-size: 12px; font-weight: 700; width: 40px; text-align: right; }
.prog-n { font-size: 10px; color: var(--text-muted); width: 26px; text-align: right; }

/* ---------- Section-0+ learning fields (optional per concept) ---------- */
.cp-simple {
  background: var(--bg-panel); border: 1px solid var(--border-color);
  border-left: 3px solid #2dd4bf; border-radius: 10px; padding: 13px 15px;
}
.cp-mistakes {
  background: var(--bg-panel); border: 1px solid var(--border-color);
  border-left: 3px solid var(--accent-amber); border-radius: 10px; padding: 13px 15px;
}
.cp-sayit {
  background: rgba(56, 189, 248, 0.05); border: 1px solid rgba(56, 189, 248, 0.25);
  border-radius: 10px; padding: 13px 15px;
}
.cp-sayit p { font-style: italic; color: #e5eaf2; }
.part {
  background: var(--bg-panel); border: 1px solid var(--border-color);
  border-left: 3px solid var(--accent-purple);
  border-radius: 9px; padding: 11px 14px; margin-bottom: 8px;
}
.part-name { font-size: 12.5px; font-weight: 700; color: #fff; margin-bottom: 4px; }
.part-text { font-size: 13px; line-height: 1.7; color: #d6dbe4; }
.part-text b { color: #fff; }

/* ==============================================================
   CARRIED OVER FROM THE STUDIO STYLESHEET (still used by the nav)
   ============================================================== */
.insp-empty { font-size: 12px; color: var(--text-muted); line-height: 1.7; }
.form-control {
  width: 100%;
  background: var(--bg-dark);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  font-family: var(--font); font-size: 12.5px;
  padding: 6px 8px; border-radius: 7px;
  outline: none;
}
.form-control:focus { border-color: var(--accent-cyan); }

/* ==============================================================
   LLD-SPECIFIC — code blocks, UML sketches, pattern taxonomy
   ============================================================== */
:root {
  --mono: 'SFMono-Regular', ui-monospace, Menlo, Consolas, 'Liberation Mono', monospace;
  --accent-pink: #f472b6;
  --accent-teal: #2dd4bf;
}

/* --- LLD header badge --- */
.logo-badge.badge-lld { background: linear-gradient(135deg, #7c3aed, #2563eb); }

/* --- Python code block --- */
.cp-code { margin-bottom: 22px; }
.code-block {
  background: #080c14;
  border: 1px solid var(--border-color);
  border-left: 3px solid var(--accent-green);
  border-radius: 10px;
  overflow: hidden;
}
.code-head {
  display: flex; align-items: center; gap: 8px;
  padding: 7px 13px;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border-color);
  font-size: 10.5px; font-weight: 700; letter-spacing: .6px;
  text-transform: uppercase; color: var(--text-muted);
}
.code-lang {
  font-size: 9.5px; font-weight: 700; letter-spacing: .5px;
  color: var(--accent-green); background: rgba(52,211,153,.12);
  padding: 2px 7px; border-radius: 999px;
}
.code-copy {
  margin-left: auto; cursor: pointer; font-size: 10px; font-weight: 600;
  color: var(--text-muted); background: var(--bg-dark);
  border: 1px solid var(--border-color); border-radius: 6px;
  padding: 3px 9px; font-family: var(--font);
}
.code-copy:hover { color: #fff; border-color: var(--accent-green); }
.code-block pre {
  margin: 0; padding: 14px 16px;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 12px; line-height: 1.65;
  color: #d6dbe4;
  tab-size: 4;
}
/* minimal, dependency-free Python highlighting */
.tok-kw   { color: #c084fc; font-weight: 600; }
.tok-cls  { color: #fbbf24; }
.tok-str  { color: #86efac; }
.tok-com  { color: #64748b; font-style: italic; }
.tok-dec  { color: #38bdf8; }
.tok-num  { color: #fca5a5; }

/* --- bad code / good code pair --- */
.code-block.code-bad { border-left-color: var(--accent-red); }
.code-block.code-bad .code-lang { color: var(--accent-red); background: rgba(248,113,113,.12); }
.code-pair { display: grid; grid-template-columns: 1fr; gap: 10px; }

/* --- ASCII UML sketch --- */
.cp-uml pre {
  margin: 0; padding: 15px 17px;
  background: var(--bg-dark);
  border: 1px solid var(--border-color);
  border-left: 3px solid var(--accent-purple);
  border-radius: 10px;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 11.5px; line-height: 1.5;
  color: #cbd5e1;
  white-space: pre;
}

/* --- pattern taxonomy badges --- */
.cc-creational { color: #fbbf24; background: rgba(251,191,36,.13); }
.cc-structural { color: var(--accent-teal); background: rgba(45,212,191,.13); }
.cc-behavioral { color: var(--accent-pink); background: rgba(244,114,182,.13); }
.cc-other      { color: #a5b4fc; background: rgba(165,180,252,.13); }

.pat-tax { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 22px; }
.pat-tax-card {
  flex: 1 1 210px;
  background: var(--bg-card); border: 1px solid var(--border-color);
  border-radius: 10px; padding: 12px 14px; cursor: pointer;
  transition: border-color .15s, transform .1s;
}
.pat-tax-card:hover { transform: translateY(-1px); }
.pat-tax-card.tx-creational:hover { border-color: #fbbf24; }
.pat-tax-card.tx-structural:hover { border-color: var(--accent-teal); }
.pat-tax-card.tx-behavioral:hover { border-color: var(--accent-pink); }
.pat-tax-card.tx-other:hover      { border-color: #a5b4fc; }
.ptc-head { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 5px; }
.ptc-title { font-size: 13px; font-weight: 700; }
.ptc-n { font-size: 10px; color: var(--text-muted); background: var(--bg-dark); padding: 1px 7px; border-radius: 999px; }
.ptc-sub { font-size: 11.5px; color: var(--text-muted); line-height: 1.55; }

/* --- "which pattern?" decision rows on the Patterns tab --- */
.pick-row {
  display: grid; grid-template-columns: 1fr auto; gap: 12px; align-items: center;
  background: var(--bg-card); border: 1px solid var(--border-color);
  border-radius: 9px; padding: 10px 13px; margin-bottom: 6px;
  cursor: pointer; transition: border-color .15s;
}
.pick-row:hover { border-color: var(--accent-purple); }
.pick-when { font-size: 12.5px; line-height: 1.55; color: #d6dbe4; }
.pick-then { font-size: 11.5px; font-weight: 700; color: var(--accent-purple); white-space: nowrap; }

/* --- problems this concept shows up in (no canvas to jump to) --- */
.chip-file {
  font-family: var(--mono); font-size: 10.5px;
  color: var(--text-muted); cursor: default;
}
.chip-file:hover { border-color: var(--border-color); color: var(--text-muted); }

/* ==============================================================
   CONCEPT PAGE v2 — glance first, prose on demand
   ============================================================== */

/* --- the always-visible "at a glance" block --- */
.glance { margin-bottom: 20px; }
.glance-label {
  font-size: 10px; font-weight: 700; letter-spacing: .9px; text-transform: uppercase;
  color: var(--text-muted); margin-bottom: 9px; display: flex; align-items: baseline; gap: 8px;
}

/* --- decision ladder (vertical, replaces the horizontal chip strip) --- */
.decide { display: flex; flex-direction: column; align-items: stretch; }
.decide-step {
  display: flex; align-items: center; gap: 11px;
  background: var(--bg-card); border: 1px solid var(--border-color);
  border-radius: 9px; padding: 9px 13px;
  font-size: 12.5px; line-height: 1.5; color: #dfe4ec;
}
.decide-step b { color: #fff; }
.decide-n {
  flex-shrink: 0; width: 19px; height: 19px; border-radius: 50%;
  background: rgba(56,189,248,.14); color: var(--accent-cyan);
  font-size: 10px; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
}
.decide-arrow { color: var(--accent-cyan); font-size: 12px; text-align: center; line-height: 1; margin: 3px 0 3px 9px; }
.decide-step-end { border-color: var(--accent-green); }
.decide-step-end .decide-n { background: rgba(52,211,153,.14); color: var(--accent-green); }

/* --- SVG diagrams --- */
.dg { width: 100%; height: auto; display: block; margin: 0 auto; max-width: 660px; }
.dg-wrap {
  background: var(--bg-dark); border: 1px solid var(--border-color);
  border-radius: 10px; padding: 14px 12px; overflow-x: auto;
}
.dg-box   { fill: #1f293d; stroke: #38455c; stroke-width: 1; }
.dg-box-i { fill: #161f31; stroke: #c084fc; stroke-width: 1; stroke-dasharray: 4 3; }
.dg-box-r { fill: #241a20; stroke: #f87171; stroke-width: 1; }
.dg-box-g { fill: #16241f; stroke: #34d399; stroke-width: 1; }
.dg-box-m { fill: #0f1626; stroke: #2b3648; stroke-width: 1; }
.dg-t  { fill: #e8edf5; font: 600 11px Inter, system-ui, sans-serif; }
.dg-tb { fill: #ffffff; font: 700 11.5px Inter, system-ui, sans-serif; }
.dg-s  { fill: #98a3b5; font: 500 9.5px Inter, system-ui, sans-serif; }
.dg-m  { fill: #b9c2d0; font: 500 10px ui-monospace, SFMono-Regular, monospace; }
.dg-l    { stroke: #55637c; stroke-width: 1.3; fill: none; }
.dg-l-d  { stroke: #55637c; stroke-width: 1.3; fill: none; stroke-dasharray: 4 3; }
.dg-l-r  { stroke: #f87171; stroke-width: 1.3; fill: none; }
.dg-l-g  { stroke: #34d399; stroke-width: 1.6; fill: none; }
.dg-l-a  { stroke: #fbbf24; stroke-width: 1.3; fill: none; }
.dg-fill { fill: #55637c; stroke: #55637c; stroke-width: 1.3; }
.dg-holl { fill: #0b0f19; stroke: #55637c; stroke-width: 1.3; }
.dg-red { fill: #f87171; } .dg-green { fill: #34d399; }
.dg-amber { fill: #fbbf24; } .dg-cyan { fill: #38bdf8; }
.dg-purple { fill: #c084fc; } .dg-mute { fill: #7c8798; }
.dg-teal { fill: #2dd4bf; } .dg-pink { fill: #f472b6; }   /* pattern families */
.dg-red-t   { fill: #f87171; font: 700 10px Inter, sans-serif; }
.dg-green-t { fill: #34d399; font: 700 10px Inter, sans-serif; }

/* --- comparison table --- */
.cmp-wrap { overflow-x: auto; border: 1px solid var(--border-color); border-radius: 10px; background: var(--bg-panel); }
.cmp { width: 100%; border-collapse: collapse; font-size: 12px; min-width: 460px; }
.cmp th {
  text-align: left; padding: 9px 12px; white-space: nowrap;
  font-size: 9.5px; font-weight: 700; letter-spacing: .8px; text-transform: uppercase;
  color: var(--text-muted); background: var(--bg-dark);
  border-bottom: 1px solid var(--border-color);
}
.cmp td { padding: 10px 12px; border-bottom: 1px solid var(--border-color); color: #d0d7e2; line-height: 1.55; vertical-align: top; }
.cmp tr:last-child td { border-bottom: none; }
.cmp tbody tr:hover td { background: var(--bg-card); }
.cmp td:first-child { font-weight: 700; color: #fff; white-space: nowrap; }
.cmp td b { color: #fff; }
.cmp code { font-family: var(--mono); font-size: 11px; color: #9fb4cc; }

/* --- bad / good code as two tabs instead of two long blocks --- */
.code-switch { display: flex; gap: 5px; margin-bottom: 9px; }
.code-sw {
  background: var(--bg-panel); border: 1px solid var(--border-color); color: var(--text-muted);
  font-family: var(--font); font-size: 11.5px; font-weight: 600;
  padding: 5px 13px; border-radius: 999px; cursor: pointer; transition: all .15s;
}
.code-sw:hover { color: #fff; }
.code-sw-bad.on  { border-color: var(--accent-red);   color: var(--accent-red);   background: rgba(248,113,113,.10); }
.code-sw-good.on { border-color: var(--accent-green); color: var(--accent-green); background: rgba(52,211,153,.10); }

/* --- collapsible sections --- */
.cp-tools { display: flex; justify-content: space-between; align-items: baseline; margin: 26px 0 10px; }
.cp-tools .glance-label { margin: 0; }
.cp-expand {
  background: none; border: 1px solid var(--border-color); color: var(--text-muted);
  font-family: var(--font); font-size: 11px; font-weight: 600;
  padding: 4px 11px; border-radius: 999px; cursor: pointer;
}
.cp-expand:hover { color: #fff; border-color: var(--accent-cyan); }

.acc { border: 1px solid var(--border-color); border-radius: 10px; margin-bottom: 6px; background: var(--bg-panel); }
.acc-head { display: flex; align-items: center; gap: 10px; padding: 11px 14px; cursor: pointer; border-radius: 10px; }
.acc-head:hover { background: var(--bg-card); }
.acc-caret { color: var(--text-muted); font-size: 9px; width: 9px; flex-shrink: 0; transition: transform .15s; }
.acc-open > .acc-head .acc-caret { transform: rotate(90deg); }
.acc-open { border-color: #3a4761; }
.acc-icon { font-size: 12.5px; flex-shrink: 0; }
.acc-title { font-size: 12.5px; font-weight: 700; color: #e8edf5; flex-shrink: 0; }
.acc-teaser {
  font-size: 11.5px; color: var(--text-muted); flex: 1; min-width: 0;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.acc-open > .acc-head .acc-teaser { opacity: 0; }
.acc-n {
  flex-shrink: 0; font-size: 9.5px; font-weight: 700; color: var(--text-muted);
  background: var(--bg-dark); padding: 2px 8px; border-radius: 999px;
}
.acc-body { padding: 4px 16px 16px; }
.acc-body > .cp-sec:last-child { margin-bottom: 0; }
.acc-body > p { font-size: 13.5px; line-height: 1.75; color: #d6dbe4; }
.acc-body > p b { color: #fff; }