:root {
  --bg: #f4f1ea;
  --ink: #1d2528;
  --muted: #687276;
  --panel: #ffffff;
  --line: #d6d0c4;
  --brass: #c48c35;
  --brass-dark: #92621f;
  --signal: #bd3b2f;
  --signal-dark: #80281f;
  --green: #22735d;
  --shadow: 0 16px 45px rgba(49, 42, 30, 0.14);
}

* {
  box-sizing: border-box;
}

html {
  -webkit-tap-highlight-color: transparent;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    linear-gradient(90deg, rgba(29, 37, 40, 0.035) 1px, transparent 1px),
    linear-gradient(rgba(29, 37, 40, 0.035) 1px, transparent 1px),
    var(--bg);
  background-size: 28px 28px;
  color: var(--ink);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  user-select: none;
  -webkit-touch-callout: none;
  -webkit-user-select: none;
}

button,
textarea,
input {
  font: inherit;
}

button {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fffaf0;
  color: var(--ink);
  cursor: pointer;
  min-height: 42px;
  padding: 0 16px;
  font-weight: 700;
  touch-action: manipulation;
  user-select: none;
  -webkit-user-select: none;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.62;
}

button.primary {
  background: var(--signal);
  border-color: var(--signal-dark);
  color: #fff;
}

.app {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  padding: 28px 0;
}

.panel {
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.hero {
  min-height: 142px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 26px;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.95), rgba(255, 251, 242, 0.9)),
    repeating-linear-gradient(90deg, transparent 0 22px, rgba(196, 140, 53, 0.12) 22px 24px);
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--signal-dark);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2 {
  margin: 0;
  letter-spacing: 0;
}

h1 {
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(2.75rem, 8vw, 5.5rem);
  line-height: 0.9;
}

h2 {
  font-size: 1.18rem;
}

.status {
  border: 1px solid rgba(34, 115, 93, 0.3);
  border-radius: 999px;
  background: rgba(34, 115, 93, 0.1);
  color: var(--green);
  padding: 8px 12px;
  white-space: nowrap;
  font-size: 0.9rem;
  font-weight: 800;
}

.audio-controls {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  flex-wrap: wrap;
  gap: 10px;
}

.audio-controls button {
  white-space: nowrap;
}

.controls {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
  margin-top: 18px;
  padding: 18px;
}

.controls label {
  display: grid;
  grid-template-columns: 82px minmax(70px, 1fr) 74px;
  align-items: center;
  gap: 10px;
  color: var(--muted);
  font-size: 0.95rem;
  font-weight: 700;
}

output {
  color: var(--ink);
}

input[type="range"] {
  accent-color: var(--signal);
  min-width: 0;
}

.workspace {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 18px;
  margin-top: 18px;
}

.mode {
  display: flex;
  flex-direction: column;
  min-height: 560px;
  padding: 20px;
}

.mode-header {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
}

textarea {
  width: 100%;
  min-height: 196px;
  resize: vertical;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px;
  background: #fffdf8;
  color: var(--ink);
  font-size: 1.08rem;
  line-height: 1.45;
  outline: none;
  user-select: text;
  -webkit-touch-callout: default;
  -webkit-user-select: text;
}

textarea:focus,
button:focus-visible {
  border-color: var(--signal);
  box-shadow: 0 0 0 3px rgba(189, 59, 47, 0.18);
}

.readout {
  margin-top: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #171c1d;
  color: #f7efe0;
  padding: 14px;
  min-height: 112px;
}

.readout span {
  display: block;
  margin-bottom: 8px;
  color: #c8bca6;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

.readout output {
  display: block;
  color: #f7efe0;
  overflow-wrap: anywhere;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 1.05rem;
  line-height: 1.55;
}

.readout.split {
  display: grid;
  grid-template-columns: 140px minmax(0, 1fr);
  gap: 18px;
  margin-top: auto;
}

.readout.split,
.manual-mode,
.manual-mode *,
.morse-reference,
.manual-hint {
  user-select: none;
  -webkit-user-select: none;
  -webkit-touch-callout: none;
}

.manual-mode {
  touch-action: manipulation;
}

.morse-reference {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fffdf8;
  padding: 12px;
  touch-action: manipulation;
}

.reference-title {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

.reference-title span:first-child {
  color: var(--ink);
  font-weight: 800;
}

.reference-title span:last-child {
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 700;
}

.reference-grid {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 6px;
}

.reference-item {
  display: grid;
  grid-template-columns: 20px minmax(0, 1fr);
  align-items: center;
  gap: 6px;
  min-height: 28px;
  border: 1px solid rgba(214, 208, 196, 0.72);
  border-radius: 6px;
  background: #ffffff;
  padding: 4px 6px;
}

.reference-char {
  color: var(--signal-dark);
  font-weight: 900;
}

.reference-code {
  color: var(--ink);
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 0.82rem;
  font-weight: 800;
  white-space: nowrap;
}

.telegraph-key {
  position: relative;
  display: block;
  width: min(100%, 420px);
  aspect-ratio: 1.45;
  margin: 16px auto 14px;
  padding: 0;
  border: 0;
  border-radius: 8px;
  background:
    radial-gradient(circle at 50% 16%, rgba(255, 255, 255, 0.7), transparent 14%),
    linear-gradient(#8a5a29, #5d391a);
  box-shadow:
    inset 0 -14px 28px rgba(0, 0, 0, 0.23),
    0 16px 28px rgba(49, 42, 30, 0.2);
  touch-action: none;
  user-select: none;
  -webkit-touch-callout: none;
  -webkit-user-select: none;
}

.telegraph-key::before,
.telegraph-key::after {
  content: "";
  position: absolute;
  left: 12%;
  right: 12%;
  height: 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.14);
}

.telegraph-key::before {
  top: 14%;
}

.telegraph-key::after {
  bottom: 14%;
}

.key-base,
.key-arm,
.key-top {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
}

.key-base {
  bottom: 20%;
  width: 72%;
  height: 22%;
  border-radius: 8px;
  background: linear-gradient(180deg, #d29b45, var(--brass-dark));
  box-shadow: inset 0 4px 0 rgba(255, 255, 255, 0.25);
}

.key-arm {
  top: 44%;
  width: 68%;
  height: 9%;
  border-radius: 999px;
  background: linear-gradient(180deg, #eed9a7, var(--brass));
  box-shadow: 0 10px 0 rgba(71, 48, 22, 0.42);
  transform: translateX(-50%) rotate(-7deg);
  transform-origin: 20% 50%;
  transition: transform 45ms ease, box-shadow 45ms ease;
}

.key-top {
  top: 20%;
  width: 29%;
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, #ffffff, #343434 36%, #111 70%);
  box-shadow: 0 10px 0 rgba(0, 0, 0, 0.24);
  z-index: 2;
  transition: transform 45ms ease, box-shadow 45ms ease;
}

.telegraph-key.is-pressed .key-top {
  transform: translate(-50%, 16px);
  box-shadow: 0 2px 0 rgba(0, 0, 0, 0.24);
}

.telegraph-key.is-pressed .key-arm {
  transform: translateX(-50%) rotate(0deg) translateY(12px);
  box-shadow: 0 2px 0 rgba(71, 48, 22, 0.42);
}

.manual-hint {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 700;
  touch-action: manipulation;
}

.manual-hint span {
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fffaf0;
  padding: 6px 10px;
}

@media (min-width: 861px) and (max-width: 1100px) {
  .reference-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (max-width: 860px) {
  .controls,
  .workspace {
    grid-template-columns: 1fr;
  }

  .mode {
    min-height: 0;
  }
}

@media (max-width: 560px) {
  .app {
    width: min(100% - 20px, 1120px);
    padding: 10px 0;
  }

  .hero,
  .mode-header {
    align-items: stretch;
    flex-direction: column;
  }

  .audio-controls {
    align-items: stretch;
    justify-content: stretch;
  }

  .audio-controls .status {
    text-align: center;
  }

  .controls label {
    grid-template-columns: 1fr;
  }

  .readout.split {
    grid-template-columns: 1fr;
  }

  .reference-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  button {
    width: 100%;
  }
}