/* ═══════════════════════════════════════════════════════════════════
   tools/protractor/style.css  —  Protractor Simulator styles
   ═══════════════════════════════════════════════════════════════════ */

/* ── Reset & Tokens ───────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:        #0d1117;
  --surface:   #161b27;
  --surface2:  #1f2535;
  --border:    #2a3050;
  --accent:    #4f8ef7;
  --accent-lo: rgba(79,142,247,.22);
  --green:     #3ddc84;
  --red:       #ff5555;
  --gold:      #f5c842;
  --text:      #dde3f0;
  --text-dim:  #6b7a99;
  --font:      'Segoe UI', system-ui, sans-serif;
  --mono:      'Courier New', monospace;
  --radius:    12px;
  /* cell accent colours */
  --msr:  #4fc3f7;   /* blue  — ANGLE */
  --csr:  #81c784;   /* green — ALT   */
  --lc:   #ffb74d;   /* gold  — TYPE  */
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  min-height: 100vh;
  padding: 20px 16px 36px;
}

#app { max-width: 980px; margin: 0 auto; display: flex; flex-direction: column; gap: 14px; }

/* ── Header ─────────────────────────────────────────────────────── */
header { text-align: center; padding: 4px 0; }
header h1 {
  font-size: 1.8rem; font-weight: 700;
  background: linear-gradient(120deg, #4f8ef7 0%, #a78bfa 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.subtitle { color: var(--text-dim); font-size: 0.85rem; margin-top: 3px; }

/* ── Controls bar ────────────────────────────────────────────────── */
.controls-bar {
  display: flex; flex-wrap: wrap; align-items: center; gap: 14px;
  padding: 12px 16px;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
}
.ctrl-group { display: flex; align-items: center; gap: 8px; }
.ctrl-label { font-size: 0.72rem; text-transform: uppercase; letter-spacing: .06em; color: var(--text-dim); white-space: nowrap; }
.lc-hint { font-size: 0.65rem; opacity: 0.65; text-transform: none; letter-spacing: 0; }
.lc-badge {
  font-size: 0.78rem; font-weight: 700; color: var(--lc);
  background: rgba(245,200,66,.12); border: 1px solid rgba(245,200,66,.3);
  border-radius: 6px; padding: 3px 10px;
}

.pill-tabs { display: flex; background: var(--bg); border-radius: 8px; padding: 3px; gap: 2px; }
.pill {
  padding: 5px 13px; border: none; background: transparent; color: var(--text-dim);
  border-radius: 6px; cursor: pointer; font-size: 0.81rem; transition: background .18s, color .18s, box-shadow .18s;
}
.pill.active { background: var(--accent); color: #fff; box-shadow: 0 0 12px var(--accent-lo); }
.pill:hover:not(.active) { background: var(--surface2); color: var(--text); }

/* ── Canvas card ──────────────────────────────────────────────────── */
.canvas-card {
  position: relative;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 10px; cursor: crosshair; overflow-x: auto;
}
.canvas-card:active { cursor: crosshair; }
#protractor-canvas { display: block; margin: 0 auto; touch-action: none; width: 100%; height: auto; max-width: 700px; }

.drag-hint {
  position: absolute; bottom: 12px; right: 16px;
  font-size: 0.72rem; color: var(--text-dim); pointer-events: none; transition: opacity .4s;
}
.drag-hint.hidden { opacity: 0; }

/* ── Zoom toggle (inside canvas card) ───────────────────────────── */
.zoom-toggle {
  position: absolute; top: 12px; right: 14px; z-index: 10;
  background: rgba(13,17,23,0.80); border: 1px solid rgba(79,142,247,0.42);
  color: #4f8ef7; border-radius: 8px; padding: 5px 13px;
  font-size: 0.78rem; font-weight: 600; cursor: pointer;
  transition: background .18s, box-shadow .18s, border-color .18s;
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
}
.zoom-toggle:hover { background: rgba(30,42,70,0.90); box-shadow: 0 0 12px rgba(79,142,247,.28); }
.zoom-toggle.active { background: rgba(79,142,247,0.20); border-color: var(--accent); color: #fff; }

/* ── Info row ────────────────────────────────────────────────────── */
.info-row {
  display: grid;
  grid-template-columns: 156px auto 1fr;
  gap: 12px;
  align-items: stretch;
}

/* ── 1. Digital readout ──────────────────────────────────────────── */
.digital-readout {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  background: #060a0e; border: 2px solid #0f3320; border-radius: var(--radius);
  padding: 14px 10px;
  box-shadow: inset 0 0 24px rgba(0,255,65,.04), 0 0 16px rgba(0,255,65,.07);
}
.dr-label { font-size: 0.65rem; color: #1f5e35; text-transform: uppercase; letter-spacing: .12em; margin-bottom: 4px; }
.dr-value {
  font-family: var(--mono); font-size: 2.2rem; font-weight: 700;
  color: #00ff55; text-shadow: 0 0 10px rgba(0,255,85,.55);
  letter-spacing: .04em; line-height: 1;
}
.dr-input {
  font-family: var(--mono); font-size: 2.2rem; font-weight: 700;
  color: #00ff55; text-shadow: 0 0 10px rgba(0,255,85,.4);
  background: transparent; border: none; outline: none;
  width: 100%; text-align: center; caret-color: #00ff55;
  letter-spacing: .04em; line-height: 1;
  -moz-appearance: textfield;
}
.dr-input::-webkit-outer-spin-button,
.dr-input::-webkit-inner-spin-button { -webkit-appearance: none; }
.dr-input::placeholder { color: rgba(0,255,85,0.25); }
.dr-unit { font-size: 0.72rem; color: #2d8c4e; margin-top: 5px; letter-spacing: .06em; }

.dr-input { display: none; }
.dr-value { display: block; }

/* ── 2. Reading cells ────────────────────────────────────────────── */
.reading-cells { display: flex; gap: 8px; align-items: stretch; }

.rcell {
  flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center;
  background: var(--surface); border: 1px solid var(--border); border-radius: 10px;
  padding: 10px 6px; min-width: 72px; text-align: center; position: relative; overflow: hidden;
  transition: filter .35s ease;
}
.rcell::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px; border-radius: 10px 10px 0 0;
}
.rcell-msr::before { background: var(--msr); }
.rcell-csr::before { background: var(--csr); }
.rcell-lc::before  { background: var(--lc); }

.rcell-abbr { font-size: 0.65rem; font-weight: 700; text-transform: uppercase; letter-spacing: .1em; margin-top: 2px; }
.rcell-msr .rcell-abbr { color: var(--msr); }
.rcell-csr .rcell-abbr { color: var(--csr); }
.rcell-lc  .rcell-abbr { color: var(--lc); }

.rcell-val {
  font-family: var(--mono); font-size: 1.55rem; font-weight: 700;
  color: var(--text); line-height: 1; margin: 4px 0 2px;
}
/* TYPE cell uses smaller font to fit word */
.type-val { font-size: 0.92rem !important; letter-spacing: 0; }
.rcell-unit { font-size: 0.62rem; color: var(--text-dim); }
.rcell-name { font-size: 0.58rem; color: var(--text-dim); margin-top: 4px; letter-spacing: .04em; }

.cells-hidden .rcell-val { filter: blur(7px); user-select: none; -webkit-user-select: none; }

/* ── 3. TR Formula / info ────────────────────────────────────────── */
.tr-formula {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 12px 14px; display: flex; flex-direction: column; justify-content: center; gap: 4px;
  transition: filter .35s ease;
}
.tr-title {
  font-size: 0.7rem; font-weight: 700; text-transform: uppercase; letter-spacing: .06em;
  color: var(--accent); margin-bottom: 4px;
}
.tr-legend {
  font-size: 0.6rem; color: var(--text-dim); line-height: 1.7;
  border-bottom: 1px solid var(--border); padding-bottom: 5px; margin-bottom: 2px;
}
.trl-msr { color: var(--msr); font-weight: 700; }
.trl-csr { color: var(--csr); font-weight: 700; }
.trl-lc  { color: var(--lc);  font-weight: 700; }

.tr-step { font-size: 0.82rem; color: var(--text-dim); font-family: var(--mono); }
.tr-step span { color: var(--text); }
.tr-result {
  font-family: var(--mono); font-size: 1.05rem; font-weight: 700;
  color: var(--gold); text-shadow: 0 0 8px rgba(245,200,66,.4); margin-top: 2px;
}

.formula-hidden .tr-step,
.formula-hidden .tr-result,
.formula-hidden .tr-legend { filter: blur(7px); user-select: none; -webkit-user-select: none; }

/* ── Buttons ─────────────────────────────────────────────────────── */
.btn {
  padding: 8px 18px; border: none; border-radius: 8px; cursor: pointer;
  font-size: 0.84rem; font-weight: 600; transition: filter .18s, box-shadow .18s, opacity .18s;
}
.btn:disabled { opacity: 0.38; cursor: not-allowed; }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:not(:disabled):hover { filter: brightness(1.12); box-shadow: 0 0 12px var(--accent-lo); }
.btn-ghost { background: var(--surface2); color: var(--text); border: 1px solid var(--border); }
.btn-ghost:hover { background: var(--border); }

.btn-play {
  background: #1b4d2e; color: #3ddc84;
  border: 1px solid #2d8c4e; font-size: 0.9rem; min-width: 100px;
}
.btn-play:hover { background: #1f5c35; box-shadow: 0 0 14px rgba(61,220,132,.25); }
.btn-play.playing {
  background: #4d1b1b; color: #ff6b6b; border-color: #8c2d2d;
  animation: pulse-red 1.4s ease-in-out infinite;
}
@keyframes pulse-red {
  0%,100% { box-shadow: 0 0 0 rgba(255,80,80,0); }
  50%      { box-shadow: 0 0 10px rgba(255,80,80,.45); }
}

/* ── Practice bar ────────────────────────────────────────────────── */
.practice-bar {
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
  padding: 12px 16px;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
}
.pbar-score { font-size: 0.84rem; color: var(--text-dim); margin-left: auto; white-space: nowrap; }
.pbar-score span { color: var(--text); font-weight: 700; }

.feedback { font-size: 0.88rem; font-weight: 600; min-width: 0; }
.feedback.ok  { color: var(--green); }
.feedback.err { color: var(--red); }

/* ── Quiz bar ────────────────────────────────────────────────────── */
.quiz-bar {
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
  padding: 12px 16px;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
}
.qbar-counter {
  display: flex; align-items: baseline; gap: 3px;
  background: var(--bg); border: 1px solid var(--border); border-radius: 8px; padding: 4px 12px;
}
.qbar-q-label { font-size: 0.7rem; font-weight: 700; color: var(--accent); text-transform: uppercase; letter-spacing: .08em; }
.qbar-q-num   { font-family: var(--mono); font-size: 1.3rem; font-weight: 700; color: var(--text); line-height: 1; }
.qbar-q-sep   { font-size: 0.82rem; color: var(--text-dim); }
.qbar-q-total { font-family: var(--mono); font-size: 0.88rem; color: var(--text-dim); }
.qbar-hint    { font-size: 0.78rem; color: var(--text-dim); }
.quiz-feedback { font-size: 0.88rem; font-weight: 600; }
.quiz-feedback.ok  { color: var(--green); }
.quiz-feedback.err { color: var(--red); }

/* ── Quiz result panel ───────────────────────────────────────────── */
.quiz-result {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 20px 22px; display: flex; flex-direction: column; gap: 14px;
}
.qr-header { display: flex; align-items: flex-start; justify-content: space-between; }
.qr-title-wrap { display: flex; flex-direction: column; gap: 5px; }
.qr-title  { font-size: 1.1rem; font-weight: 700; color: var(--text); }
.qr-stars  { font-size: 1.2rem; letter-spacing: 3px; }
.qr-score-wrap { text-align: right; }
.qr-score {
  font-family: var(--mono); font-size: 2.2rem; font-weight: 700; line-height: 1;
  text-shadow: 0 0 14px currentColor;
}
.qr-score.perfect { color: var(--gold); }
.qr-score.good    { color: var(--green); }
.qr-score.poor    { color: var(--red); }
.qr-verdict { font-size: 0.72rem; color: var(--text-dim); margin-top: 3px; }

.qr-rows { display: flex; flex-direction: column; gap: 7px; }
.qr-row {
  display: grid; grid-template-columns: 30px 1fr 1fr 26px;
  align-items: center; gap: 10px;
  background: var(--surface2); border: 1px solid var(--border);
  border-left-width: 3px; border-radius: 8px; padding: 9px 12px;
}
.qr-row.ok  { border-left-color: var(--green); }
.qr-row.err { border-left-color: var(--red); }
.qr-qnum    { font-size: 0.72rem; font-weight: 700; color: var(--accent); }
.qr-correct, .qr-given { font-size: 0.78rem; color: var(--text-dim); }
.qr-correct strong, .qr-given strong { color: var(--text); font-family: var(--mono); }
.qr-mark { text-align: right; font-size: 1rem; font-weight: 700; }
.qr-row.ok  .qr-mark { color: var(--green); }
.qr-row.err .qr-mark { color: var(--red); }

/* ── Responsive ──────────────────────────────────────────────────── */
@media (max-width: 500px) {
  .info-row { grid-template-columns: 1fr; }
  .reading-cells { flex-wrap: wrap; }
}