/* Morse Code Translator — shared styles
   Dark navy / amber "signal" theme. System fonts only. No frameworks. */

:root {
  --bg: #0a1120;
  --bg2: #0d1730;
  --panel: #111d38;
  --panel2: #16264a;
  --line: #24365e;
  --text: #e9edf6;
  --muted: #a7b3c9;
  --amber: #ffb81d;
  --amber2: #ff9500;
  --amber-soft: rgba(255, 184, 29, 0.14);
  --ok: #57d38c;
  --radius: 14px;
  --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  line-height: 1.6;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--amber); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { max-width: 980px; margin: 0 auto; padding: 0 18px; }

/* ---------- header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(10, 17, 32, 0.94);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.header-in {
  display: flex; align-items: center; justify-content: space-between;
  gap: 14px; padding: 12px 0; flex-wrap: wrap;
}
.brand {
  display: flex; align-items: center; gap: 10px;
  color: var(--text); font-weight: 800; font-size: 1.12rem; letter-spacing: 0.2px;
}
.brand:hover { text-decoration: none; }
.brand-mark {
  display: inline-flex; align-items: center; gap: 4px;
  background: var(--amber-soft); border: 1px solid var(--line);
  padding: 7px 9px; border-radius: 9px;
}
.brand-mark .d { width: 9px; height: 9px; border-radius: 50%; background: var(--amber); display: inline-block; }
.brand-mark .da { width: 22px; height: 9px; border-radius: 5px; background: var(--amber); display: inline-block; }
.main-nav { display: flex; flex-wrap: wrap; gap: 2px; }
.main-nav a {
  color: var(--muted); padding: 7px 11px; border-radius: 8px; font-size: 0.95rem; font-weight: 600;
}
.main-nav a:hover { color: var(--text); background: var(--panel); text-decoration: none; }
.main-nav a.active { color: var(--amber); background: var(--amber-soft); }

/* ---------- hero ---------- */
.hero { padding: 38px 0 8px; text-align: center; }
.hero h1 { font-size: 2.15rem; line-height: 1.2; letter-spacing: -0.5px; }
.hero h1 .hl { color: var(--amber); }
.hero p.lede { color: var(--muted); max-width: 640px; margin: 12px auto 0; font-size: 1.05rem; }

/* ---------- tool ---------- */
.tool {
  background: linear-gradient(180deg, var(--panel2), var(--panel));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
  margin: 26px 0;
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.35);
}
.mode-toggle { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 14px; }
.mode-toggle button {
  flex: 1 1 auto; cursor: pointer; border: 1px solid var(--line);
  background: var(--bg2); color: var(--muted); font: inherit; font-weight: 700; font-size: 0.92rem;
  padding: 9px 10px; border-radius: 9px;
}
.mode-toggle button[aria-pressed="true"] { background: var(--amber); border-color: var(--amber); color: #191104; }
.tool label.lbl { display: block; font-weight: 700; font-size: 0.9rem; margin: 10px 0 6px; color: var(--muted); }
.tool textarea {
  width: 100%; min-height: 110px; resize: vertical;
  background: var(--bg); color: var(--text);
  border: 1px solid var(--line); border-radius: 10px;
  padding: 13px 14px; font: inherit; font-size: 1.05rem;
}
.tool textarea:focus { outline: 2px solid var(--amber); outline-offset: 1px; border-color: var(--amber); }
.output-box {
  background: var(--bg); border: 1px dashed var(--line); border-radius: 10px;
  padding: 14px; min-height: 74px; font-family: var(--mono);
  font-size: 1.12rem; letter-spacing: 2px; word-break: break-word; white-space: pre-wrap;
}
.output-box.text-mode { font-family: var(--sans); letter-spacing: 0.4px; font-size: 1.2rem; }
.output-box:empty::before { content: attr(data-placeholder); color: var(--muted); font-family: var(--sans); letter-spacing: 0; font-size: 0.98rem; }
.tool-row { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin-top: 14px; }
.btn {
  cursor: pointer; border: 1px solid var(--line); background: var(--bg2); color: var(--text);
  font: inherit; font-weight: 700; font-size: 0.95rem;
  padding: 10px 16px; border-radius: 9px; display: inline-flex; align-items: center; gap: 7px;
}
.btn:hover { border-color: var(--amber); }
.btn-primary { background: var(--amber); border-color: var(--amber); color: #191104; }
.btn-primary:hover { background: var(--amber2); border-color: var(--amber2); }
.btn:disabled { opacity: 0.45; cursor: default; }
.btn.small { padding: 6px 11px; font-size: 0.85rem; }
.slider-group { display: flex; align-items: center; gap: 9px; color: var(--muted); font-size: 0.9rem; font-weight: 600; }
.slider-group output { color: var(--amber); font-family: var(--mono); min-width: 74px; }
input[type="range"] { accent-color: var(--amber); width: 130px; }
.char-count { color: var(--muted); font-size: 0.85rem; margin-left: auto; }
.copy-note { color: var(--ok); font-size: 0.88rem; font-weight: 700; }

/* signal lamp */
.lamp-row { display: flex; align-items: center; gap: 14px; margin-top: 16px; }
.signal-lamp {
  width: 54px; height: 54px; border-radius: 50%; flex: 0 0 auto;
  background: #1a2745; border: 2px solid var(--line);
  transition: background 40ms linear, box-shadow 40ms linear;
}
.signal-lamp.on {
  background: var(--amber); border-color: var(--amber2);
  box-shadow: 0 0 34px 8px rgba(255, 184, 29, 0.55);
}
.signal-lamp.big { width: 110px; height: 110px; border-width: 3px; }
.lamp-caption { color: var(--muted); font-size: 0.92rem; }

/* ---------- content ---------- */
main section { margin: 34px 0; }
h2 { font-size: 1.5rem; margin-bottom: 12px; letter-spacing: -0.3px; }
h3 { font-size: 1.13rem; margin: 18px 0 7px; }
p { margin-bottom: 12px; }
.muted { color: var(--muted); }
ul, ol { margin: 0 0 14px 22px; }
li { margin-bottom: 6px; }
.card {
  background: var(--panel); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 20px; margin: 20px 0;
}
code, .codefont { font-family: var(--mono); }
.inline-code {
  background: var(--bg2); border: 1px solid var(--line); border-radius: 6px;
  padding: 1px 7px; font-family: var(--mono); font-size: 0.92em; color: var(--amber);
}

/* steps */
.steps { counter-reset: step; list-style: none; margin-left: 0; }
.steps li {
  counter-increment: step; position: relative; padding-left: 46px; margin-bottom: 14px;
}
.steps li::before {
  content: counter(step); position: absolute; left: 0; top: 1px;
  width: 32px; height: 32px; border-radius: 50%;
  background: var(--amber); color: #191104; font-weight: 800;
  display: flex; align-items: center; justify-content: center; font-size: 0.95rem;
}

/* tables */
table { width: 100%; border-collapse: collapse; margin: 14px 0 20px; font-size: 0.98rem; }
th, td { border: 1px solid var(--line); padding: 9px 12px; text-align: left; }
th { background: var(--panel2); color: var(--text); }
td.code, th.code { font-family: var(--mono); letter-spacing: 2px; }
table.chart-table td:first-child { font-weight: 800; font-size: 1.1rem; width: 70px; text-align: center; }
table.chart-table td:nth-child(2) { font-family: var(--mono); letter-spacing: 3px; font-size: 1.1rem; color: var(--amber); width: 170px; }

/* alphabet cards */
.alpha-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(215px, 1fr)); gap: 13px; margin: 16px 0; }
.alpha-card {
  background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 15px;
  display: flex; flex-direction: column; gap: 5px;
}
.alpha-card .letter { font-size: 1.7rem; font-weight: 800; line-height: 1; }
.alpha-card .code { font-family: var(--mono); color: var(--amber); font-size: 1.3rem; letter-spacing: 4px; }
.alpha-card .rhythm { color: var(--muted); font-size: 0.88rem; font-style: italic; }
.alpha-card .hint { font-size: 0.92rem; }
.alpha-card .btn { align-self: flex-start; margin-top: 6px; }

/* FAQ */
.faq details {
  background: var(--panel); border: 1px solid var(--line); border-radius: 10px;
  padding: 13px 16px; margin-bottom: 10px;
}
.faq summary { cursor: pointer; font-weight: 700; font-size: 1.02rem; }
.faq details p { margin: 9px 0 3px; color: var(--muted); }

/* page link cards */
.page-links { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 13px; margin: 16px 0; }
.page-links a {
  display: block; background: var(--panel); border: 1px solid var(--line);
  border-radius: 12px; padding: 15px; color: var(--text);
}
.page-links a:hover { border-color: var(--amber); text-decoration: none; }
.page-links a strong { display: block; color: var(--amber); margin-bottom: 3px; }
.page-links a span { color: var(--muted); font-size: 0.9rem; }

/* SOS */
.sos-hero { text-align: center; padding: 26px 0 4px; }
.sos-code { font-family: var(--mono); font-size: 2.2rem; letter-spacing: 8px; color: var(--amber); margin: 8px 0 4px; }
.sos-lamp-wrap { display: flex; justify-content: center; margin: 20px 0; }
.btn-sos {
  font-size: 1.15rem; padding: 15px 30px; border-radius: 12px;
  background: var(--amber); border: 2px solid var(--amber2); color: #191104; font-weight: 800; cursor: pointer;
}
.btn-sos:hover { background: var(--amber2); }

/* footer */
.site-footer { border-top: 1px solid var(--line); margin-top: 46px; padding: 26px 0 34px; background: var(--bg2); }
.footer-links { display: flex; flex-wrap: wrap; gap: 6px 18px; margin-bottom: 12px; }
.footer-links a { color: var(--muted); font-size: 0.93rem; }
.footer-links a:hover { color: var(--amber); }
.site-footer p { color: var(--muted); font-size: 0.88rem; margin-bottom: 5px; }

/* ---------- responsive ---------- */
@media (max-width: 640px) {
  body { font-size: 16px; }
  .hero h1 { font-size: 1.65rem; }
  .tool { padding: 15px; }
  .header-in { justify-content: center; text-align: center; }
  .main-nav { justify-content: center; }
  .char-count { margin-left: 0; width: 100%; }
  input[type="range"] { width: 105px; }
  .sos-code { font-size: 1.5rem; letter-spacing: 5px; }
}

/* ---------- upgrades: settings selects, hints ---------- */
.slider-group select {
  background: var(--bg); color: var(--text); border: 1px solid var(--line);
  border-radius: 8px; padding: 6px 8px; font: inherit; font-size: 0.9rem; font-weight: 600;
}
.check-group { display: flex; align-items: center; gap: 8px; color: var(--muted); font-size: 0.92rem; font-weight: 600; }
.check-group input { accent-color: var(--amber); width: 17px; height: 17px; }
kbd {
  background: var(--bg2); border: 1px solid var(--line); border-bottom-width: 2px;
  border-radius: 6px; padding: 0 6px; font-family: var(--mono); font-size: 0.85em;
}
.kb-hint { font-size: 0.88rem; margin-top: 10px; }

/* theme toggle (injected into the nav by app.js) */
.theme-toggle {
  background: none; border: 1px solid transparent; color: var(--muted);
  font: inherit; font-weight: 600; font-size: 0.95rem;
  padding: 7px 11px; border-radius: 8px; cursor: pointer;
}
.theme-toggle:hover { color: var(--text); background: var(--panel); }

/* ---------- light theme ---------- */
html[data-theme="light"] {
  --bg: #f2f5fb;
  --bg2: #e7ecf6;
  --panel: #ffffff;
  --panel2: #eef2fa;
  --line: #c3cfe2;
  --text: #17233c;
  --muted: #4d5c76;
  --amber-soft: rgba(255, 149, 0, 0.16);
}
html[data-theme="light"] .site-header { background: rgba(242, 245, 251, 0.94); }
html[data-theme="light"] .signal-lamp { background: #ccd7ec; }
html[data-theme="light"] .tool { box-shadow: 0 14px 30px rgba(23, 35, 60, 0.12); }
html[data-theme="light"] .p-feedback.bad { color: #bd2c2c; }

/* ---------- light (flash) translator ---------- */
.signal-lamp.flash-stage {
  width: 100%; height: min(52vh, 430px); border-radius: 18px; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
}
.signal-lamp.flash-stage:fullscreen { height: 100%; border-radius: 0; }
.flash-stage .stage-hint {
  color: var(--muted); font-weight: 700; font-size: 1rem; text-align: center; padding: 0 20px;
  pointer-events: none;
}
.signal-lamp.flash-stage.on .stage-hint { color: #191104; }

/* ---------- practice trainer ---------- */
.p-stats { display: flex; flex-wrap: wrap; gap: 9px; margin: 4px 0 2px; }
.p-stat {
  background: var(--bg2); border: 1px solid var(--line); border-radius: 999px;
  padding: 5px 14px; font-weight: 700; font-size: 0.9rem; color: var(--muted);
}
.answer-input {
  width: 100%; background: var(--bg); color: var(--text);
  border: 1px solid var(--line); border-radius: 10px;
  padding: 13px 14px; font: inherit; font-size: 1.2rem;
  text-transform: uppercase; letter-spacing: 3px;
}
.answer-input:focus { outline: 2px solid var(--amber); outline-offset: 1px; border-color: var(--amber); }
.p-feedback { min-height: 1.6em; font-weight: 700; margin-top: 12px; }
.p-feedback.ok { color: var(--ok); }
.p-feedback.bad { color: #ff8585; }
.p-code {
  font-family: var(--mono); font-size: 1.3rem; letter-spacing: 3px;
  color: var(--amber); min-height: 1.6em; margin-top: 4px; word-break: break-word;
}

/* ---------- upgrade pack: highlighting, puzzle, tap, mic, embed ---------- */
.output-box .hl-tok { border-radius: 4px; padding: 0 1px; }
.output-box .hl-tok.hl-on { background: var(--amber); color: #191104; }
.now-playing {
  font-family: var(--mono); color: var(--amber); letter-spacing: 3px;
  font-size: 1.15rem; min-height: 1.5em; margin-top: 10px; font-weight: 700;
}
.output-box.puzzle-covered { filter: blur(11px); -webkit-user-select: none; user-select: none; pointer-events: none; }

.tap-pad {
  width: 100%; min-height: 118px; margin-top: 6px;
  border: 2px dashed var(--line); border-radius: 14px;
  background: var(--bg2); color: var(--text);
  font: inherit; font-weight: 800; font-size: 1.1rem; cursor: pointer;
  touch-action: none; -webkit-user-select: none; user-select: none;
  -webkit-tap-highlight-color: transparent;
}
.tap-pad:focus-visible { outline: 2px solid var(--amber); outline-offset: 2px; }
.tap-pad.pressing { background: var(--amber); color: #191104; border-color: var(--amber); border-style: solid; }

.mic-status { color: var(--muted); font-weight: 600; }
.mic-status.live { color: var(--ok); }

.embed-snippet {
  width: 100%; min-height: 92px; border-radius: 10px; resize: vertical;
  background: var(--bg); color: var(--text); border: 1px solid var(--line);
  padding: 12px; font-family: var(--mono); font-size: 0.85rem;
}

/* embed mode (?embed=1): show only the tool so the translator can be
   iframed into other websites without our navigation around it. */
html.is-embed .site-header,
html.is-embed .site-footer,
html.is-embed .hero,
html.is-embed main > section,
html.is-embed .kb-hint { display: none !important; }
html.is-embed .tool { margin-top: 12px; }
html.is-embed .wrap { padding-top: 8px; }

/* ---------- print (chart page) ---------- */
@media print {
  body { background: #fff; color: #000; font-size: 12pt; }
  .site-header, .site-footer, .no-print, .tool, .btn { display: none !important; }
  a { color: #000; }
  .card, .alpha-card { border-color: #bbb; background: #fff; }
  th { background: #eee; color: #000; }
  table.chart-table td:nth-child(2), .alpha-card .code { color: #000; }
  h1, h2, h3 { color: #000; }
  .muted, .faq details p { color: #333; }
  .faq details { border-color: #bbb; background: #fff; }
}

/* Accessibility additions (27 Oct 2026) */
.skip-link{position:absolute;left:-9999px;top:0;background:#000;color:#fff;padding:8px 12px;z-index:100}
.skip-link:focus{left:0}
.article-dates{font-size:.9em;color:#555;margin:0 0 1em}
.toc{border:1px solid #ddd;padding:12px 16px;margin:0 0 1.5em}
.toc ul{margin:.5em 0 0 1.2em}
@media (prefers-reduced-motion: reduce){
  *,*::before,*::after{animation-duration:.01ms !important;animation-iteration-count:1 !important;transition-duration:.01ms !important;scroll-behavior:auto !important}
}