/* ================================================
   letter.css — Individual Morse Code Character Pages
   ================================================ */

/* ── HERO ────────────────────────────────────────── */
.lp-hero {
  background: linear-gradient(135deg, #0a0c0f 0%, #0d1020 100%);
  border-bottom: 1px solid var(--border);
  padding: 48px 0 56px;
}
.lp-hero-inner {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 48px;
  align-items: center;
}
.lp-char-display {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  text-align: center;
  box-shadow: 0 0 40px rgba(232,184,75,.06);
  position: relative;
  overflow: hidden;
}
.lp-char-display::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 50% 0%, rgba(232,184,75,.07) 0%, transparent 70%);
  pointer-events: none;
}
.lp-char {
  display: block;
  font-family: var(--morse-font);
  font-size: 6rem;
  color: var(--text-main);
  line-height: 1;
  margin-bottom: 16px;
}
.lp-visual {
  display: flex;
  gap: 8px;
  justify-content: center;
  align-items: center;
  min-height: 28px;
  margin-bottom: 12px;
}
.lp-code {
  font-family: var(--morse-font);
  font-size: 1.4rem;
  color: var(--accent);
  letter-spacing: .2em;
}

/* Dot/dash visual elements */
.mc-dot {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent2);
  box-shadow: 0 0 10px rgba(75,232,184,.4);
  flex-shrink: 0;
}
.mc-dash {
  width: 52px;
  height: 18px;
  border-radius: 9px;
  background: var(--accent);
  box-shadow: 0 0 10px rgba(232,184,75,.35);
  flex-shrink: 0;
}

.lp-eyebrow {
  font-size: .75rem;
  text-transform: uppercase;
  letter-spacing: .14em;
  color: var(--accent);
  font-family: var(--morse-font);
  margin-bottom: 10px;
}
.lp-hero-text h1 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  color: var(--text-main);
  margin-bottom: 14px;
}
.lp-subtitle {
  font-size: 1.05rem;
  color: var(--text-muted);
  margin-bottom: 20px;
  line-height: 1.6;
}
.lp-intro {
  color: var(--text-muted);
  font-size: .95rem;
  line-height: 1.75;
  margin-bottom: 12px;
}

/* ── TOOL CARD ───────────────────────────────────── */
.lp-tools {
  padding: 0;
  margin-top: -1px;
}
.tool-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  margin: 32px 0;
  box-shadow: var(--shadow);
}
.answer-block {
  text-align: center;
  padding: 24px;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 24px;
  position: relative;
  overflow: hidden;
}
.answer-block::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 50% 0%, rgba(232,184,75,.05) 0%, transparent 60%);
  pointer-events: none;
}
.ans-label {
  font-size: .72rem;
  text-transform: uppercase;
  letter-spacing: .14em;
  color: var(--text-dim);
  font-family: var(--morse-font);
  margin-bottom: 12px;
}
.ans-code {
  font-family: var(--morse-font);
  font-size: clamp(2rem, 6vw, 3.5rem);
  color: var(--accent);
  letter-spacing: .18em;
  margin-bottom: 14px;
  line-height: 1;
}
.ans-visual {
  display: flex;
  gap: 8px;
  justify-content: center;
  align-items: center;
  margin-bottom: 12px;
  min-height: 24px;
}
.ans-text {
  font-size: .85rem;
  color: var(--text-dim);
  font-family: var(--morse-font);
}

/* Tool controls */
.tool-controls {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}
.tc-btn {
  padding: 11px 22px;
  border-radius: var(--radius);
  font-family: var(--body-font);
  font-size: .9rem;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all .2s;
  white-space: nowrap;
}
.tc-primary {
  background: var(--accent);
  color: #000;
  border-color: var(--accent);
}
.tc-primary:hover { opacity: .88; }
.tc-secondary {
  background: var(--bg-panel);
  color: var(--text-muted);
  border-color: var(--border);
}
.tc-secondary:hover { border-color: var(--accent); color: var(--accent); }
.tc-sm {
  padding: 6px 14px;
  font-size: .8rem;
  background: var(--bg-panel);
  color: var(--text-muted);
  border-color: var(--border);
}
.tc-sm:hover { border-color: var(--accent); color: var(--accent); }

/* Waveform / status */
.waveform-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 12px;
}
.wf-label {
  font-family: var(--morse-font);
  font-size: .82rem;
  color: var(--text-dim);
}

/* Blink indicator */
.blink-indicator {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px 16px;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 12px;
}
.bl-light {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--text-dim);
  border: 2px solid var(--border-glow);
  transition: background .05s, box-shadow .05s;
  flex-shrink: 0;
}
.bl-light.on {
  background: #ffe066;
  box-shadow: 0 0 22px 6px rgba(255,224,102,.55);
}
.bl-label {
  font-family: var(--morse-font);
  font-size: .85rem;
  color: var(--text-muted);
  flex: 1;
}
.tool-status {
  font-size: .82rem;
  color: var(--accent2);
  font-family: var(--morse-font);
  margin-top: 8px;
  min-height: 20px;
}

/* ── CONTENT SECTIONS ────────────────────────────── */
.lp-section { padding: 56px 0; }
.lp-alt { background: var(--bg-panel); }
.lp-h2 {
  font-size: 1.5rem;
  color: var(--text-main);
  margin-bottom: 16px;
  border-left: 3px solid var(--accent);
  padding-left: 14px;
}
.lp-h3 {
  font-size: 1.05rem;
  color: var(--accent);
  margin-bottom: 10px;
  font-family: var(--morse-font);
}
.lp-p {
  color: var(--text-muted);
  font-size: .95rem;
  line-height: 1.75;
  margin-bottom: 20px;
}

/* ── QUIZ WIDGET ─────────────────────────────────── */
.quiz-widget {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  max-width: 540px;
}
.quiz-question {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
}
.quiz-char {
  font-family: var(--morse-font);
  font-size: 3.5rem;
  color: var(--text-main);
  line-height: 1;
}
.quiz-prompt {
  font-family: var(--morse-font);
  font-size: 1.2rem;
  color: var(--text-dim);
}
.quiz-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-bottom: 14px;
}
.quiz-opt {
  padding: 14px;
  background: var(--bg-panel);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  font-family: var(--morse-font);
  font-size: 1.1rem;
  color: var(--text-main);
  cursor: pointer;
  transition: all .15s;
  letter-spacing: .12em;
  text-align: center;
}
.quiz-opt:hover:not(:disabled) { border-color: var(--accent); color: var(--accent); }
.quiz-opt:disabled { cursor: default; opacity: .7; }
.quiz-opt.correct { border-color: var(--accent2); background: rgba(75,232,184,.1); color: var(--accent2); }
.quiz-opt.wrong { border-color: #e84b4b; background: rgba(232,75,75,.08); color: #e84b4b; }
.quiz-result { min-height: 28px; font-size: .9rem; }
.qr-correct { color: var(--accent2); font-weight: 600; }
.qr-wrong { color: #e84b4b; font-weight: 600; }

/* ── TAP GUIDE ───────────────────────────────────── */
.tap-guide {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-bottom: 16px;
}
.tap-sequence {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: flex-start;
}
.tap-step {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 14px 18px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  min-width: 80px;
}
.tap-dot { background: rgba(75,232,184,.08); border-color: var(--accent2); }
.tap-dash { background: rgba(232,184,75,.08); border-color: var(--accent); }
.tap-sym {
  font-family: var(--morse-font);
  font-size: .95rem;
  color: var(--text-main);
}
.tap-dot .tap-sym { color: var(--accent2); }
.tap-dash .tap-sym { color: var(--accent); }
.tap-dur {
  font-size: .75rem;
  color: var(--text-dim);
  font-family: var(--morse-font);
}
.tap-rule-box {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
}
.tap-rule-box h3 {
  font-size: .8rem;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--accent);
  font-family: var(--morse-font);
  margin-bottom: 12px;
}
.tap-rules { list-style: none; padding: 0; }
.tap-rules li {
  font-size: .88rem;
  color: var(--text-muted);
  padding: 5px 0;
  border-bottom: 1px solid var(--border);
  line-height: 1.5;
}
.tap-rules li:last-child { border-bottom: none; }

/* Timing table */
.timing-table {
  width: 100%;
  border-collapse: collapse;
  font-size: .88rem;
  margin: 12px 0 0;
}
.timing-table th {
  background: var(--bg-panel);
  color: var(--accent);
  padding: 10px 14px;
  text-align: left;
  font-size: .76rem;
  text-transform: uppercase;
  letter-spacing: .07em;
  border-bottom: 1px solid var(--border);
}
.timing-table td {
  padding: 10px 14px;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
  font-family: var(--morse-font);
}
.timing-table tr:last-child td { border-bottom: none; }
.timing-table tr:hover td { background: rgba(232,184,75,.03); }

/* ── MEMORY CARD ─────────────────────────────────── */
.memory-card {
  display: flex;
  gap: 20px;
  align-items: flex-start;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 16px;
}
.memory-icon { font-size: 2rem; flex-shrink: 0; }
.memory-body { flex: 1; }
.memory-text {
  color: var(--text-muted);
  font-size: .95rem;
  line-height: 1.7;
  margin-bottom: 12px;
}
.memory-code {
  font-family: var(--morse-font);
  font-size: 1.6rem;
  color: var(--accent);
  letter-spacing: .2em;
}
.nato-box {
  background: rgba(75,232,184,.06);
  border: 1px solid rgba(75,232,184,.2);
  border-radius: var(--radius);
  padding: 14px 18px;
  font-size: .88rem;
  color: var(--text-muted);
  margin-top: 12px;
}
.nato-box strong { color: var(--text-main); }

/* ── FAQ ─────────────────────────────────────────── */
.lp-faq { display: flex; flex-direction: column; gap: 4px; }
.lp-faq-item {
  border-bottom: 1px solid var(--border);
  overflow: hidden;
}
.lp-faq-q {
  width: 100%;
  background: none;
  border: none;
  text-align: left;
  padding: 16px 0;
  color: var(--text-main);
  font-size: .95rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  transition: color .2s;
}
.lp-faq-q:hover { color: var(--accent); }
.lp-faq-q::after { content: '+'; color: var(--accent); font-size: 1.2rem; flex-shrink: 0; }
.lp-faq-q[aria-expanded="true"]::after { content: '−'; }
.lp-faq-a { display: none; padding: 0 0 16px; }
.lp-faq-a.open { display: block; }
.lp-faq-a p { color: var(--text-muted); font-size: .9rem; line-height: 1.75; }

/* ── RELATED GRID ────────────────────────────────── */
.rel-grid {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}
.rel-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 20px;
  text-decoration: none;
  text-align: center;
  min-width: 100px;
  transition: all .2s;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.rel-card:hover { border-color: var(--accent); box-shadow: 0 0 14px rgba(232,184,75,.1); }
.rel-char { font-family: var(--morse-font); font-size: 1.8rem; color: var(--text-main); }
.rel-morse { font-family: var(--morse-font); font-size: .85rem; color: var(--accent); letter-spacing: .1em; }
.rel-name { font-size: .72rem; color: var(--text-dim); }

.browse-all-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 8px;
}
.browse-btn {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 10px 18px;
  border-radius: var(--radius);
  text-decoration: none;
  font-size: .88rem;
  transition: all .2s;
}
.browse-btn:hover { border-color: var(--accent); color: var(--accent); }

/* ── CHAR NAV ────────────────────────────────────── */
.char-nav {
  background: var(--bg-card);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 16px 0;
}
.char-nav-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}
.nav-btn {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 10px 18px;
  border-radius: var(--radius);
  text-decoration: none;
  font-size: .85rem;
  font-family: var(--morse-font);
  transition: all .2s;
  white-space: nowrap;
}
.nav-btn:hover { border-color: var(--accent); color: var(--accent); }
.nav-center { text-align: center; }

/* ── RESPONSIVE ──────────────────────────────────── */
@media (max-width: 780px) {
  .lp-hero-inner { grid-template-columns: 1fr; gap: 24px; }
  .lp-char-display { max-width: 240px; margin: 0 auto; }
  .tap-guide { grid-template-columns: 1fr; }
  .quiz-options { grid-template-columns: 1fr 1fr; }
  .char-nav-inner { flex-wrap: wrap; justify-content: center; }
  .tool-controls { flex-direction: column; }
  .tc-btn { width: 100%; text-align: center; }
}
@media (max-width: 480px) {
  .lp-section { padding: 36px 0; }
  .tool-card { padding: 18px; }
  .quiz-options { grid-template-columns: 1fr; }
}