:root {
  color-scheme: light;
  --bg: #f7f9fd;
  --bg-strong: #ffffff;
  --surface: #ffffff;
  --surface-soft: #fbfcff;
  --text: #06163f;
  --muted: #5d6b85;
  --line: #dfe6f0;
  --line-strong: #c9d4e4;
  --accent: #1768d8;
  --accent-dark: #08295f;
  --accent-soft: #edf4ff;
  --swap-bg: #08295f;
  --swap-text: #ffffff;
  --swap-ring: rgba(23, 104, 216, 0.18);
  --danger: #ad2a1f;
  --success: #18794e;
  --shadow: 0 18px 42px rgba(20, 38, 72, 0.11);
  --shadow-soft: 0 10px 28px rgba(20, 38, 72, 0.07);
  --radius: 8px;
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  --sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0a101b;
  --bg-strong: #0f1724;
  --surface: #141f30;
  --surface-soft: #101928;
  --text: #eff5ff;
  --muted: #b2bfd2;
  --line: #2d3d55;
  --line-strong: #425773;
  --accent: #8db9ff;
  --accent-dark: #d7e6ff;
  --accent-soft: #1b2e4b;
  --swap-bg: #18243a;
  --swap-text: #d7e6ff;
  --swap-ring: rgba(141, 185, 255, 0.22);
  --danger: #ffb2a8;
  --success: #82e1b2;
  --shadow: 0 20px 48px rgba(0, 0, 0, 0.34);
  --shadow-soft: 0 12px 32px rgba(0, 0, 0, 0.24);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--sans);
  color: var(--text);
  background:
    linear-gradient(180deg, rgba(231, 238, 248, 0.76), rgba(255, 255, 255, 0) 430px),
    var(--bg);
  line-height: 1.55;
  text-rendering: optimizeLegibility;
  transition: background-color 320ms ease, color 320ms ease;
}

:root[data-theme="dark"] body {
  background:
    linear-gradient(180deg, rgba(33, 48, 72, 0.72), rgba(10, 16, 27, 0) 460px),
    var(--bg);
}

body::selection {
  background: color-mix(in srgb, var(--accent) 28%, transparent);
}

.ambient-field {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
  contain: layout style paint;
}

.ambient-mark {
  position: absolute;
  color: color-mix(in srgb, var(--accent) 24%, transparent);
  font-family: var(--mono);
  font-weight: 900;
  font-size: clamp(1.1rem, 1.8vw, 2rem);
  opacity: 0.52;
  transform: translate3d(
    calc((var(--cursor-x, 50vw) - 50vw) * var(--depth, 0.015)),
    calc((var(--cursor-y, 50vh) - 50vh) * var(--depth, 0.015)),
    0
  );
  animation: ambientDrift var(--speed, 12s) ease-in-out infinite alternate;
}

:root[data-theme="dark"] .ambient-mark {
  color: color-mix(in srgb, var(--accent) 28%, transparent);
  opacity: 0.36;
}

.mark-1 { top: 12%; left: 7%; --depth: -0.018; --speed: 13s; }
.mark-2 { top: 19%; left: 84%; --depth: 0.024; --speed: 11s; }
.mark-3 { top: 35%; left: 14%; --depth: 0.018; --speed: 15s; }
.mark-4 { top: 42%; left: 74%; --depth: -0.02; --speed: 12s; }
.mark-5 { top: 58%; left: 6%; --depth: 0.026; --speed: 14s; }
.mark-6 { top: 67%; left: 88%; --depth: -0.016; --speed: 16s; }
.mark-7 { top: 78%; left: 24%; --depth: 0.018; --speed: 13s; }
.mark-8 { top: 91%; left: 70%; --depth: -0.024; --speed: 17s; }
.mark-9 { top: 26%; left: 48%; --depth: 0.014; --speed: 18s; }
.mark-10 { top: 52%; left: 42%; --depth: -0.018; --speed: 15s; }
.mark-11 { top: 73%; left: 53%; --depth: 0.02; --speed: 12s; }
.mark-12 { top: 8%; left: 58%; --depth: -0.016; --speed: 16s; }
.mark-13 { top: 88%; left: 9%; --depth: 0.022; --speed: 14s; }
.mark-14 { top: 31%; left: 93%; --depth: 0.012; --speed: 19s; }
.mark-15 { top: 64%; left: 34%; --depth: -0.021; --speed: 12s; }
.mark-16 { top: 15%; left: 29%; --depth: 0.017; --speed: 17s; }
.mark-17 { top: 49%; left: 94%; --depth: 0.023; --speed: 14s; }
.mark-18 { top: 84%; left: 43%; --depth: -0.014; --speed: 20s; }

a { color: inherit; text-decoration: none; }
a:hover { color: var(--accent); }
button, input, textarea { font: inherit; }
button { cursor: pointer; }

body,
.site-header,
.tool-card,
.answer-card,
.section,
.source-card,
.feature-tile,
.info-card,
.symbol-card,
.benefit-card,
.step-card,
textarea,
.result-box,
.segmented,
.icon-button,
.button,
.keyer-button,
.keyer-mode-pill,
.keyer-output-grid label {
  transition-property: background, background-color, border-color, color, box-shadow, transform;
  transition-duration: 260ms;
  transition-timing-function: ease;
}

:root.theme-switching body {
  animation: themeWash 430ms ease;
}

main {
  width: min(1240px, calc(100% - 40px));
  margin: 0 auto;
}

.skip-link {
  position: absolute;
  left: 12px;
  top: -48px;
  z-index: 20;
  background: var(--accent-dark);
  color: white;
  padding: 10px 14px;
  border-radius: var(--radius);
}

.skip-link:focus { top: 12px; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  min-height: 74px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 28px;
  padding: 0 max(24px, calc((100vw - 1240px) / 2));
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--surface) 88%, transparent);
  backdrop-filter: blur(18px);
  transition: background 320ms ease, border-color 320ms ease, box-shadow 320ms ease;
}

.site-header.is-scrolled {
  box-shadow: 0 12px 30px rgba(20, 38, 72, 0.08);
  border-bottom-color: color-mix(in srgb, var(--accent) 20%, var(--line));
}

.brand,
.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 850;
  letter-spacing: 0;
}

.brand-signal {
  display: inline-grid;
  grid-auto-flow: column;
  align-items: center;
  gap: 4px;
}

.brand-signal i,
.brand-signal b {
  display: block;
  height: 5px;
  border-radius: 999px;
  background: var(--accent);
}

.brand-signal i { width: 5px; }
.brand-signal b { width: 18px; }

.main-nav {
  justify-self: center;
  display: flex;
  align-items: center;
  gap: clamp(18px, 3vw, 46px);
  font-size: 0.94rem;
  font-weight: 760;
}

.main-nav a {
  position: relative;
  padding: 26px 0;
}

.main-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 18px;
  height: 2px;
  transform: scaleX(0);
  background: var(--accent);
  transform-origin: center;
  transition: transform 180ms ease;
}

.main-nav a:hover::after { transform: scaleX(1); }

.icon-button {
  min-width: 48px;
  height: 38px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  font-size: 0.78rem;
  font-weight: 800;
  transition: transform 160ms ease, border-color 160ms ease, box-shadow 160ms ease;
}

.icon-button:hover {
  transform: translateY(-1px);
  border-color: var(--accent);
  box-shadow: var(--shadow-soft);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.hero {
  padding: 22px 0 30px;
}

.hero-plain {
  padding: 18px 0 24px;
}

.hero-top {
  position: relative;
  display: grid;
  place-items: center;
  min-height: clamp(290px, 29vw, 440px);
  overflow: hidden;
  isolation: isolate;
}

.hero-copy h1 {
  max-width: 720px;
  margin: 0;
  font-size: clamp(3.4rem, 7vw, 6.2rem);
  line-height: 0.96;
  letter-spacing: 0;
}

.hero-copy {
  position: relative;
  z-index: 2;
  display: grid;
  justify-items: center;
  max-width: 980px;
  margin: 0 auto;
  text-align: center;
}

.hero-copy p {
  max-width: 620px;
  margin: 16px 0 0;
  color: var(--text);
  font-size: clamp(1rem, 1.55vw, 1.22rem);
}

.trust-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px 28px;
  margin-top: 18px;
  color: var(--accent-dark);
  font-size: 0.92rem;
  font-weight: 820;
}

.trust-row span {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding-left: 30px;
}

.trust-row span::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 19px;
  height: 19px;
  border: 1px solid color-mix(in srgb, var(--accent) 40%, var(--line));
  border-radius: 5px;
  background: color-mix(in srgb, var(--accent) 11%, var(--surface));
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--surface) 62%, transparent);
}

.trust-row span::after {
  content: "";
  position: absolute;
  left: 6px;
  top: 50%;
  width: 7px;
  height: 11px;
  border-right: 2px solid var(--accent);
  border-bottom: 2px solid var(--accent);
  transform: translateY(-62%) rotate(42deg);
  transform-origin: center;
}

.hero-wave {
  position: absolute;
  inset: 0;
  z-index: 1;
  min-height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(10px, 1.25vw, 18px);
  opacity: 0.46;
  pointer-events: none;
  transform:
    translate3d(
      calc((var(--cursor-x, 50vw) - 50vw) * -0.018),
      calc((var(--cursor-y, 50vh) - 50vh) * -0.012 - (var(--scroll-ratio, 0) * 24px)),
      0
    )
    scale(1.68);
  transition: transform 220ms ease, opacity 260ms ease;
}

.hero-wave i,
.hero-wave .wave-dot,
.hero-wave .wave-dash {
  display: block;
  border-radius: 999px;
  background: color-mix(in srgb, var(--accent) 52%, var(--line));
  animation: wavePulse 2.2s ease-in-out infinite;
  animation-delay: calc(var(--d, 0) * 90ms);
}

.hero-wave i {
  width: clamp(5px, 0.55vw, 8px);
  height: calc(var(--h) * 1.55);
  background: color-mix(in srgb, var(--accent) 22%, var(--line));
}

.hero-wave .wave-dot {
  width: clamp(18px, 1.9vw, 28px);
  height: clamp(18px, 1.9vw, 28px);
}

.hero-wave .wave-dash {
  width: clamp(86px, 8vw, 132px);
  height: clamp(14px, 1.2vw, 21px);
  background: var(--accent);
}

.hero-tool {
  margin-top: -60px;
  position: relative;
  z-index: 3;
}

.hero-plain .hero-top {
  min-height: clamp(250px, 25vw, 360px);
}

.hero-plain .hero-copy h1 {
  font-size: clamp(2.8rem, 5.6vw, 5.4rem);
}

.hero-plain .hero-copy p {
  margin-top: 14px;
}

.hero-plain .trust-row {
  margin-top: 16px;
}

.hero-plain .hero-wave {
  opacity: 0.42;
  transform:
    translate3d(
      calc((var(--cursor-x, 50vw) - 50vw) * -0.012),
      calc((var(--cursor-y, 50vh) - 50vh) * -0.008 - (var(--scroll-ratio, 0) * 14px)),
      0
    )
    scale(1.62);
}

.button {
  position: relative;
  overflow: hidden;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  font-weight: 820;
  transition: transform 160ms ease, box-shadow 160ms ease, border-color 160ms ease, background 160ms ease;
}

.button:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-soft);
  border-color: color-mix(in srgb, var(--accent) 42%, var(--line));
}

.button:active { transform: translateY(1px); }
.button.primary { border-color: var(--accent-dark); background: var(--accent-dark); color: white; }
.button.secondary { background: var(--surface); border-color: var(--line-strong); color: var(--text); }
.button.ghost { background: transparent; }
.button.small { min-height: 36px; padding: 0 13px; font-size: 0.88rem; }

.button-ripple {
  position: absolute;
  width: 12px;
  height: 12px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--accent) 22%, white);
  pointer-events: none;
  transform: translate(-50%, -50%) scale(0);
  animation: ripple 520ms ease-out forwards;
}

.tool-card,
.answer-card,
.section,
.source-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--surface) 94%, transparent);
  box-shadow: var(--shadow-soft);
}

.tool-card.is-playing,
.answer-card.is-playing,
.section.is-playing {
  border-color: color-mix(in srgb, var(--accent) 48%, var(--line));
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 12%, transparent), var(--shadow);
}

.tool-card {
  padding: clamp(20px, 3vw, 28px);
}

.translator-card {
  position: relative;
}

.translator-card::before {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: var(--radius);
  pointer-events: none;
  background: radial-gradient(420px circle at var(--mx, 50%) var(--my, 50%), rgba(23, 104, 216, 0.12), transparent 42%);
  opacity: 0;
  transition: opacity 180ms ease;
}

.translator-card:hover::before { opacity: 1; }

.translator-toolbar,
.tool-card-head,
.section-head,
.section-title {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 18px;
}

.translator-toolbar h2,
.tool-card h2,
.section h2,
.answer-card h2,
.source-card h2,
.site-footer h2 {
  margin: 0;
  font-size: 1.2rem;
  line-height: 1.2;
}

.translator-toolbar p,
.tool-card p,
.section-head p,
.section-title p {
  margin: 7px 0 0;
  color: var(--muted);
}

.section-title a {
  color: var(--accent);
  font-weight: 820;
  font-size: 0.94rem;
}

.segmented {
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-width: min(100%, 340px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--surface-soft);
}

.segmented button {
  border: 0;
  padding: 11px 12px;
  background: transparent;
  color: var(--text);
  font-weight: 820;
}

.segmented button.active {
  background: var(--accent);
  color: white;
}

.translator-grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 52px minmax(0, 1fr);
  gap: 22px;
  align-items: center;
}

.translator-panel {
  display: grid;
  gap: 8px;
}

.field-label,
.search-label,
.eyeless-label {
  display: block;
  color: var(--accent-dark);
  font-weight: 850;
  font-size: 0.86rem;
  letter-spacing: 0;
}

textarea,
.search-input,
input[type="search"] {
  width: 100%;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--surface-soft);
  color: var(--text);
  padding: 16px;
  resize: vertical;
  outline: none;
  transition: border-color 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

textarea:focus,
.search-input:focus {
  border-color: var(--accent);
  background: var(--surface);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 15%, transparent);
}

.translator-panel textarea,
.translator-panel .result-box {
  min-height: 156px;
}

.result-box {
  display: block;
  width: 100%;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--surface-soft);
  color: var(--text);
  padding: 16px;
  font-family: var(--mono);
  font-size: 1.05rem;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.panel-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  min-height: 38px;
  color: var(--muted);
  font-size: 0.9rem;
}

.panel-actions {
  justify-content: flex-end;
  flex-wrap: wrap;
}

.swap-button {
  width: 52px;
  height: 52px;
  border: 1px solid color-mix(in srgb, var(--accent) 34%, var(--line));
  border-radius: 999px;
  background: var(--swap-bg);
  color: var(--swap-text);
  font-size: 0;
  box-shadow: 0 0 0 12px var(--swap-ring), 0 14px 28px rgba(6, 22, 63, 0.16);
  transition: transform 180ms ease, box-shadow 180ms ease, background 240ms ease, border-color 240ms ease;
}

.swap-button::before {
  content: "<>";
  font-size: 1.05rem;
  font-weight: 900;
  letter-spacing: 0;
}

.swap-button:hover {
  transform: rotate(180deg) scale(1.04);
  box-shadow: 0 0 0 15px var(--swap-ring), 0 18px 34px rgba(6, 22, 63, 0.22);
}

:root[data-theme="dark"] .swap-button {
  box-shadow: 0 0 0 10px var(--swap-ring), 0 12px 28px rgba(0, 0, 0, 0.28);
}

.morse-token {
  display: inline-block;
  min-width: 0.35em;
  padding: 1px 2px;
  border-radius: 4px;
  transition: background 100ms ease, color 100ms ease, transform 100ms ease;
}

.morse-token.is-playing {
  background: var(--accent);
  color: white;
  transform: translateY(-2px);
}

.tool-error {
  margin: 12px 0 0;
  color: var(--danger);
  font-weight: 760;
}

.examples {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  font-size: 0.9rem;
}

.examples button,
.symbol-actions button,
td button {
  position: relative;
  overflow: hidden;
  min-height: 34px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  padding: 0 11px;
  font-weight: 780;
  transition: transform 150ms ease, border-color 150ms ease, box-shadow 150ms ease;
}

.examples button:hover,
.symbol-actions button:hover,
td button:hover {
  transform: translateY(-1px);
  border-color: var(--accent);
  box-shadow: var(--shadow-soft);
}

.feature-tiles {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 12px;
  margin: 8px 0 30px;
}

.feature-tile,
.info-card,
.symbol-card,
.benefit-card,
.step-card,
.compact-alphabet a,
.alphabet-strip a {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  transition: transform 170ms ease, box-shadow 170ms ease, border-color 170ms ease, background 170ms ease;
}

.feature-tile {
  display: grid;
  justify-items: center;
  align-content: start;
  gap: 10px;
  min-height: 168px;
  padding: 22px 16px;
  text-align: center;
}

.tile-mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: var(--radius);
  background: var(--accent-soft);
  color: var(--accent);
  font-family: var(--mono);
  font-size: 1.05rem;
  font-weight: 900;
}

.feature-tile strong,
.info-card strong,
.benefit-card strong,
.step-card strong {
  font-weight: 860;
}

.feature-tile span:last-child,
.info-card span,
.benefit-card p,
.step-card p,
.link-list span {
  color: var(--muted);
}

.feature-tile:hover,
.info-card:hover,
.symbol-card:hover,
.benefit-card:hover,
.step-card:hover,
.compact-alphabet a:hover,
.alphabet-strip a:hover {
  transform: translateY(-4px);
  border-color: color-mix(in srgb, var(--accent) 34%, var(--line));
  box-shadow: var(--shadow);
}

.section {
  padding: clamp(22px, 3vw, 30px);
  margin: 20px 0;
}

.split-section,
.columns {
  display: grid;
  grid-template-columns: 1.18fr 0.82fr;
  gap: 24px;
}

.split-section { align-items: start; }
.stacked-cards { display: grid; gap: 14px; align-content: start; }

.compact-alphabet,
.alphabet-grid,
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(132px, 1fr));
  gap: 12px;
}

.compact-alphabet {
  grid-template-columns: repeat(auto-fit, minmax(74px, 1fr));
}

.compact-alphabet a,
.alphabet-strip a {
  display: grid;
  gap: 4px;
  min-height: 68px;
  padding: 14px;
}

.alphabet-strip {
  display: grid;
  grid-template-columns: repeat(11, minmax(72px, 1fr));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.alphabet-strip a {
  border: 0;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  border-radius: 0;
  min-height: 76px;
  text-align: center;
}

code,
.compact-alphabet code,
.alphabet-strip code,
.symbol-card code,
.phrase-code {
  font-family: var(--mono);
}

.symbol-card {
  padding: 16px;
}

.symbol-card strong {
  display: block;
  font-size: 1.45rem;
}

.symbol-card code {
  display: block;
  margin: 4px 0 12px;
  font-size: 1.1rem;
}

.symbol-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.symbol-actions a {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 0 10px;
  border-radius: var(--radius);
  color: var(--accent);
  font-weight: 780;
}

.info-card {
  display: grid;
  gap: 8px;
  min-height: 112px;
  padding: 16px;
}

.benefit-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 12px;
}

.centered-section > h2 {
  text-align: center;
  margin-bottom: 22px;
}

.benefit-grid {
  grid-template-columns: repeat(4, 1fr);
}

.benefit-card {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 14px;
  align-items: center;
  padding: 20px;
}

.benefit-card p,
.step-card p {
  margin: 6px 0 0;
}

.step-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(16px, 5vw, 76px);
}

.step-card {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 16px;
  align-items: center;
  padding: 22px;
}

.step-card span {
  display: grid;
  place-items: center;
  width: 52px;
  height: 52px;
  border-radius: 999px;
  background: var(--accent);
  color: white;
  font-weight: 900;
  font-size: 1.28rem;
}

.answer-card {
  width: min(760px, 100%);
  margin: 18px 0;
  padding: 26px;
}

.phrase-text {
  margin: 0;
  font-size: clamp(2rem, 6vw, 4rem);
  font-weight: 880;
  line-height: 1;
}

.phrase-code {
  display: block;
  margin-top: 16px;
  font-size: clamp(1.3rem, 3vw, 2.1rem);
  overflow-wrap: anywhere;
}

.giant-char {
  margin: 0;
  font-size: clamp(6rem, 18vw, 12rem);
  line-height: 0.88;
  font-weight: 900;
}

.table-wrap { overflow-x: auto; }

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 620px;
}

th,
td {
  padding: 12px;
  border-bottom: 1px solid var(--line);
  text-align: left;
}

th {
  color: var(--muted);
  font-size: 0.86rem;
  text-transform: uppercase;
  letter-spacing: 0;
}

.faq-list {
  display: grid;
  gap: 10px;
}

details {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 14px 16px;
  transition: border-color 160ms ease, box-shadow 160ms ease;
}

details[open] {
  border-color: color-mix(in srgb, var(--accent) 28%, var(--line));
  box-shadow: var(--shadow-soft);
}

summary {
  cursor: pointer;
  font-weight: 830;
}

details p {
  margin: 10px 0 0;
  color: var(--muted);
}

.steps,
.timeline {
  margin: 0;
  padding-left: 22px;
}

.steps li,
.timeline li {
  margin: 10px 0;
}

.timeline li span {
  display: block;
  color: var(--muted);
}

.link-list {
  display: grid;
  gap: 8px;
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
}

.link-list a {
  font-weight: 780;
  color: var(--text);
}

.link-list span {
  display: block;
  font-size: 0.92rem;
}

.control-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px;
  margin: 14px 0;
}

.control-grid label,
.score-row {
  display: flex;
  align-items: center;
  gap: 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 12px;
  background: var(--surface-soft);
  font-weight: 780;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}

.progress {
  height: 8px;
  border-radius: 999px;
  background: var(--accent-soft);
  overflow: hidden;
  margin: 14px 0;
}

.progress span {
  display: block;
  width: 0%;
  height: 100%;
  background: var(--accent);
  transition: width 160ms ease;
}

.practice-stage {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface-soft);
}

.practice-prompt {
  display: block;
  font-family: var(--mono);
  font-size: clamp(2rem, 6vw, 4rem);
  font-weight: 860;
  line-height: 1;
}

.answer-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin-top: 14px;
}

.answer-grid button {
  min-height: 54px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  font-weight: 860;
  font-size: 1.2rem;
  transition: transform 150ms ease, border-color 150ms ease, background 150ms ease;
}

.answer-grid button:hover { transform: translateY(-2px); border-color: var(--accent); }
.answer-grid button.correct { border-color: var(--success); background: color-mix(in srgb, var(--success) 15%, var(--surface)); }
.answer-grid button.wrong { border-color: var(--danger); background: color-mix(in srgb, var(--danger) 13%, var(--surface)); }

.feedback {
  min-height: 28px;
  color: var(--muted);
  font-weight: 760;
}

.score-row {
  flex-wrap: wrap;
  justify-content: space-between;
}

.practice-suite {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  gap: 18px;
  align-items: stretch;
}

.practice-suite .tool-card {
  height: 100%;
}

.keyer-tool {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(520px circle at 80% 8%, color-mix(in srgb, var(--accent) 13%, transparent), transparent 48%),
    color-mix(in srgb, var(--surface) 94%, transparent);
}

.keyer-tool::before {
  content: "";
  position: absolute;
  inset: 12px;
  border: 1px solid color-mix(in srgb, var(--accent) 12%, transparent);
  border-radius: var(--radius);
  pointer-events: none;
}

.keyer-tool > * {
  position: relative;
}

.keyer-mode-pill {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  padding: 0 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  background: color-mix(in srgb, var(--surface-soft) 82%, transparent);
  font-size: 0.78rem;
  font-weight: 820;
  white-space: nowrap;
}

.keyer-console {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 220px;
  margin: 12px 0 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background:
    linear-gradient(180deg, color-mix(in srgb, var(--accent-soft) 54%, transparent), transparent),
    var(--surface-soft);
}

.keyer-meter {
  position: absolute;
  inset: 28px 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(7px, 1vw, 12px);
  opacity: 0.52;
  pointer-events: none;
}

.keyer-meter i {
  display: block;
  width: 6px;
  height: var(--h);
  min-height: 18px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--accent) 46%, transparent);
  transform-origin: center;
  animation: keyerIdle 2.3s ease-in-out infinite;
  animation-delay: calc(var(--d) * -170ms);
}

.keyer-button {
  position: relative;
  z-index: 1;
  display: grid;
  place-items: center;
  width: clamp(142px, 18vw, 188px);
  aspect-ratio: 1;
  border: 1px solid color-mix(in srgb, var(--accent) 55%, var(--line));
  border-radius: 999px;
  color: var(--swap-text);
  background:
    radial-gradient(circle at 36% 28%, rgba(255, 255, 255, 0.34), transparent 34%),
    linear-gradient(145deg, color-mix(in srgb, var(--accent) 88%, #0b1f44), var(--swap-bg));
  box-shadow:
    0 18px 42px color-mix(in srgb, var(--accent) 22%, transparent),
    inset 0 -14px 26px rgba(0, 0, 0, 0.18);
  isolation: isolate;
  touch-action: none;
  user-select: none;
}

.keyer-button::before,
.keyer-button::after {
  content: "";
  position: absolute;
  inset: -12px;
  border-radius: inherit;
  border: 1px solid color-mix(in srgb, var(--accent) 24%, transparent);
  opacity: 0.58;
  z-index: -1;
}

.keyer-button::after {
  inset: -26px;
  opacity: 0.2;
}

.keyer-button span {
  display: block;
  font-size: clamp(1rem, 1.4vw, 1.25rem);
  font-weight: 900;
}

.keyer-button b {
  display: block;
  margin-top: 4px;
  font-size: 0.78rem;
  font-weight: 820;
  color: color-mix(in srgb, white 80%, var(--accent-soft));
}

.keyer-tool.is-key-down .keyer-button {
  transform: scale(0.96);
  box-shadow:
    0 10px 24px color-mix(in srgb, var(--accent) 28%, transparent),
    inset 0 10px 26px rgba(0, 0, 0, 0.22);
}

.keyer-tool.is-key-down .keyer-button::before {
  animation: keyerRing 680ms ease-out infinite;
}

.keyer-tool.is-key-down .keyer-meter i,
.keyer-tool.is-playing .keyer-meter i {
  animation: keyerLive 520ms ease-in-out infinite;
  opacity: 0.9;
}

.keyer-output-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.keyer-output-grid label {
  display: grid;
  gap: 8px;
  min-height: 92px;
  padding: 13px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--surface) 88%, transparent);
}

.keyer-output-grid label > span {
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 820;
}

.keyer-code,
.keyer-text {
  display: block;
  overflow-wrap: anywhere;
  color: var(--text);
  font-weight: 860;
}

.keyer-code {
  font-family: var(--mono);
  font-size: clamp(1.1rem, 2vw, 1.55rem);
  letter-spacing: 0.04em;
}

.keyer-text {
  font-size: clamp(1rem, 1.8vw, 1.35rem);
}

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

.keyer-controls label {
  flex-wrap: wrap;
}

.keyer-controls strong {
  margin-left: auto;
  color: var(--accent-dark);
  font-size: 0.86rem;
}

.keyer-actions {
  margin-top: 12px;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding: 0;
  margin: 12px 0 0;
  list-style: none;
}

.tag-list li {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 8px 10px;
  background: var(--surface);
  font-family: var(--mono);
}

.prev-next {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin: 18px 0 32px;
}

.prev-next a {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 14px;
  text-align: center;
  font-weight: 820;
}

.source-list {
  display: grid;
  gap: 14px;
}

.source-card {
  padding: 18px;
}

.source-card h2 a {
  color: var(--accent);
}

.prose p {
  max-width: 72ch;
  color: var(--muted);
}

.site-footer {
  display: grid;
  grid-template-columns: 1.25fr repeat(3, 1fr);
  gap: 34px;
  margin-top: 48px;
  padding: 38px max(24px, calc((100vw - 1240px) / 2));
  border-top: 1px solid var(--line);
  background: var(--surface);
}

.site-footer p {
  color: var(--muted);
  margin: 8px 0 0;
}

.footer-line {
  grid-column: 1 / -1;
  border-top: 1px solid var(--line);
  padding-top: 18px;
  font-size: 0.92rem;
}

.reveal-ready {
  opacity: 1;
  transform: none;
}

.reveal-ready.is-visible {
  animation: riseIn 620ms cubic-bezier(.2,.75,.2,1) both;
  animation-delay: var(--reveal-delay, 0ms);
}

.is-audio-playing .hero-wave i {
  animation-duration: 900ms;
}

[hidden] { display: none !important; }

@keyframes wavePulse {
  0%, 100% { transform: scaleY(0.72); opacity: 0.5; }
  45% { transform: scaleY(1); opacity: 1; }
}

@keyframes ambientDrift {
  from { margin-top: -10px; opacity: 0.32; }
  50% { opacity: 0.6; }
  to { margin-top: 16px; opacity: 0.44; }
}

@keyframes themeWash {
  from { filter: saturate(0.82) brightness(1.04); }
  to { filter: saturate(1) brightness(1); }
}

@keyframes ripple {
  to {
    opacity: 0;
    transform: translate(-50%, -50%) scale(18);
  }
}

@keyframes riseIn {
  from {
    opacity: 0.72;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes keyerIdle {
  0%, 100% { transform: scaleY(0.72); opacity: 0.46; }
  50% { transform: scaleY(1); opacity: 0.78; }
}

@keyframes keyerLive {
  0%, 100% { transform: scaleY(0.62); }
  45% { transform: scaleY(1.28); }
}

@keyframes keyerRing {
  from {
    opacity: 0.55;
    transform: scale(1);
  }
  to {
    opacity: 0;
    transform: scale(1.18);
  }
}

@media (max-width: 1020px) {
  .feature-tiles { grid-template-columns: repeat(3, 1fr); }
  .benefit-grid { grid-template-columns: repeat(2, 1fr); }
  .alphabet-strip { grid-template-columns: repeat(6, minmax(72px, 1fr)); }
  .practice-suite { grid-template-columns: 1fr; }
}

@media (max-width: 860px) {
  main { width: min(100% - 24px, 720px); }
  .site-header {
    grid-template-columns: 1fr auto;
    gap: 12px;
    padding: 12px;
  }
  .main-nav {
    grid-column: 1 / -1;
    justify-self: stretch;
    overflow-x: auto;
    gap: 18px;
    padding-bottom: 2px;
  }
  .main-nav a { padding: 4px 0 8px; }
  .main-nav a::after { bottom: 0; }
  .hero { padding-top: 22px; }
  .translator-grid,
  .split-section,
  .columns,
  .site-footer {
    grid-template-columns: 1fr;
  }
  .hero-top {
    min-height: clamp(360px, 90vw, 430px);
  }
  .hero-plain .hero-top {
    min-height: clamp(300px, 74vw, 360px);
  }
  .hero-wave {
    inset: 0 -18%;
    justify-content: center;
    opacity: 0.34;
    transform:
      translate3d(
        calc((var(--cursor-x, 50vw) - 50vw) * -0.01),
        calc((var(--cursor-y, 50vh) - 50vh) * -0.008 - (var(--scroll-ratio, 0) * 16px)),
        0
      )
      scale(1.22);
  }
  .hero-copy {
    max-width: 680px;
  }
  .hero-plain .hero-wave {
    opacity: 0.32;
    transform:
      translate3d(
        calc((var(--cursor-x, 50vw) - 50vw) * -0.008),
        calc((var(--cursor-y, 50vh) - 50vh) * -0.006 - (var(--scroll-ratio, 0) * 10px)),
        0
      )
      scale(1.18);
  }
  .hero-tool {
    margin-top: -34px;
  }
  .translator-toolbar,
  .tool-card-head,
  .section-head,
  .section-title {
    display: block;
  }
  .segmented {
    margin-top: 14px;
    width: 100%;
  }
  .swap-button {
    justify-self: center;
    transform: rotate(90deg);
  }
  .swap-button:hover { transform: rotate(270deg) scale(1.04); }
  .feature-tiles,
  .benefit-grid,
  .step-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .answer-grid { grid-template-columns: repeat(2, 1fr); }
  .keyer-console { min-height: 190px; }
  .keyer-output-grid,
  .keyer-controls {
    grid-template-columns: 1fr;
  }
  .keyer-mode-pill {
    margin-top: 12px;
  }
  .prev-next { grid-template-columns: 1fr; }
  .tool-actions {
    align-items: stretch;
  }
  .tool-actions .button {
    flex: 1 1 132px;
  }
}

@media (max-width: 520px) {
  body { background: var(--bg); }
  .brand span:last-child { max-width: 190px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
  .hero-copy h1 { font-size: clamp(2.85rem, 14vw, 4.4rem); }
  .feature-tiles,
  .benefit-grid,
  .step-grid {
    grid-template-columns: 1fr 1fr;
    gap: 10px;
  }
  .feature-tile {
    min-height: 148px;
    padding: 18px 12px;
  }
  .tile-mark {
    width: 36px;
    height: 36px;
  }
  .alphabet-strip {
    grid-template-columns: repeat(3, 1fr);
  }
  .benefit-card,
  .step-card {
    grid-template-columns: 1fr;
    align-content: start;
  }
  .translator-panel textarea,
  .translator-panel .result-box {
    min-height: 132px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 1ms !important;
    transition-duration: 1ms !important;
    scroll-behavior: auto !important;
  }
}