/* ─── Reset ─────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box; margin: 0; padding: 0;
  -webkit-tap-highlight-color: transparent;
}

/* ─── Theme tokens (defaults = Amber) ─────── */
:root {
  --bg:       #0c0d11;
  --surface:  #14161f;
  --surface2: #1b1d28;
  --border:   #252838;
  --accent:   #f5a623;
  --text:     #dde0f0;
  --dim:      #484b66;
  --green:    #4ec98a;
  --red:      #e05c5c;
  --mono:     'Share Tech Mono', monospace;
  --kb-h:     240px;
}

/* ─── Base ───────────────────────────────── */
html {
  height: 100%;
  overflow-x: hidden;
  /* prevent iOS from auto-scaling text in landscape */
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  height: 100%;
  width: 100%;
  max-width: 100vw;
  overflow-x: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: var(--mono);
  overscroll-behavior: none;
  /* smooth momentum scrolling on iOS */
  -webkit-overflow-scrolling: touch;
}

/* ─── Page ───────────────────────────────── */
#page {
  min-height: 100dvh;
  width: 100%;
  overflow-x: hidden;
  padding-bottom: calc(var(--kb-h) + env(safe-area-inset-bottom, 0px) + .75rem);
}

/* ─── Top bar ────────────────────────────── */
.topbar {
  position: sticky; top: 0; z-index: 20;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: .4rem .75rem;
  /* contain logo letter-spacing so it can't overflow */
  overflow: hidden;
}

.logo {
  font-size: .65rem;
  letter-spacing: 5px;
  color: var(--dim);
  /* trim trailing letter-spacing gap */
  margin-right: -5px;
}

.topbar-right { display: flex; gap: .4rem; flex-shrink: 0; }

.topbar-btn {
  font-family: var(--mono);
  font-size: .72rem;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  padding: .25rem .7rem;
  cursor: pointer;
  touch-action: manipulation;
  transition: background .1s;
  /* prevent text from wrapping or overflowing */
  white-space: nowrap;
}
.topbar-btn:active { background: var(--border); }

/* ─── Reference panel ────────────────────── */
.ref-panel {
  max-height: 0;
  overflow: hidden;
  transition: max-height .28s ease;
}
.ref-panel.open {
  max-height: 42dvh;
  overflow-y: auto;
  overflow-x: hidden;
  -webkit-overflow-scrolling: touch;
  border-bottom: 1px solid var(--border);
}

/* Responsive: auto-fit columns based on available width */
.ref-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(40px, 1fr));
  gap: 1px;
  background: var(--border);
  width: 100%;
}

/* ─── Reference sections ────────────────────── */
.ref-section { border-bottom: 1px solid var(--border); }
.ref-section:last-child { border-bottom: none; }

.ref-section-label {
  font-size: .52rem;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--dim);
  padding: .22rem .5rem;
  background: var(--surface2);
  border-bottom: 1px solid var(--border);
}

/* ─── Reference card ─────────────────────── */
.ref-card {
  background: var(--surface);
  padding: .28rem .05rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .08rem;
  cursor: pointer;
  touch-action: manipulation;
  user-select: none;
  transition: background .15s;
  overflow: hidden;
  min-width: 0;
}
.ref-card:active { background: var(--surface2); }
.ref-card.flash  { background: color-mix(in srgb, var(--accent) 22%, var(--surface)); }

.ref-letter { font-size: .78rem; font-weight: 700; color: var(--text); }
.ref-morse  {
  font-size: .5rem; color: var(--accent);
  letter-spacing: .5px;
  /* trim letter-spacing overflow */
  max-width: 100%;
  overflow: hidden;
}

/* ─── Notes section ─────────────────────── */
.notes-section {
  padding: .45rem .75rem 0;
  overflow: hidden;
}

.notes-meta {
  display: flex;
  align-items: center;
  gap: .6rem;
  margin-bottom: .3rem;
  overflow: hidden;
}

.meta-stat { font-size: .65rem; color: var(--dim); letter-spacing: 1px; white-space: nowrap; }
.wpm { margin-left: auto; }

.copy-btn {
  font-family: var(--mono);
  font-size: .68rem;
  background: none;
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--dim);
  padding: .18rem .55rem;
  cursor: pointer;
  touch-action: manipulation;
  white-space: nowrap;
  flex-shrink: 0;
  transition: color .15s, border-color .15s;
}
.copy-btn:active { color: var(--accent); border-color: var(--accent); }
.copy-btn.copied { color: var(--green);  border-color: var(--green); }

.notes {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: .6rem .75rem;
  min-height: 76px;
  line-height: 1.6;
  color: var(--text);
  word-break: break-all;
  overflow-wrap: break-word;
  white-space: pre-wrap;
  width: 100%;
  max-width: 100%;
  overflow: hidden;
  transition: font-size .2s;
}

/* text size variants (set via JS on .notes) */
.notes.sz-sm { font-size: .9rem;   letter-spacing: 1px; }
.notes.sz-md { font-size: 1.1rem;  letter-spacing: 1.5px; }
.notes.sz-lg { font-size: 1.45rem; letter-spacing: 2px; }

.notes-hint { color: var(--dim); font-size: .82rem; letter-spacing: 1px; }

.cursor {
  display: inline-block;
  width: 2px; height: 1.1em;
  background: var(--accent);
  vertical-align: text-bottom;
  margin-left: 1px;
  animation: blink 1s step-end infinite;
}
@keyframes blink { 50% { opacity: 0; } }

.notes-morse {
  font-size: .65rem;
  color: var(--dim);
  letter-spacing: 1.5px;
  word-break: break-all;
  overflow-wrap: break-word;
  line-height: 1.5;
  padding: .22rem .75rem 0;
  overflow: hidden;
  max-width: 100%;
  display: none;
}
.notes-morse.visible { display: block; }

/* ─── Settings overlay ───────────────────── */
.settings-overlay {
  position: fixed; inset: 0;
  background: rgba(0,0,0,.6);
  z-index: 150;
  opacity: 0;
  pointer-events: none;
  transition: opacity .25s;
}
.settings-overlay.open {
  opacity: 1;
  pointer-events: all;
}

/* ─── Settings bottom-sheet ──────────────── */
.settings-panel {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  z-index: 200;
  background: var(--surface);
  border-top: 1px solid var(--border);
  border-radius: 16px 16px 0 0;
  transform: translateY(100%);
  transition: transform .32s cubic-bezier(.32,.72,0,1);
  max-height: 82dvh;
  width: 100%;
  display: flex;
  flex-direction: column;
  /* respect notch on both sides */
  padding-left: env(safe-area-inset-left, 0px);
  padding-right: env(safe-area-inset-right, 0px);
  padding-bottom: env(safe-area-inset-bottom, 0px);
}
.settings-panel.open { transform: translateY(0); }

.sheet-handle {
  width: 32px; height: 3px;
  background: var(--border);
  border-radius: 2px;
  margin: 8px auto 0;
  flex-shrink: 0;
}

.sheet-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: .5rem 1rem .4rem;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.sheet-title { font-size: .65rem; letter-spacing: 3px; color: var(--dim); }

.sheet-close {
  background: none; border: none;
  color: var(--dim); font-size: .95rem;
  cursor: pointer; touch-action: manipulation;
  padding: .2rem .4rem;
  flex-shrink: 0;
  transition: color .1s;
}
.sheet-close:active { color: var(--text); }

.sheet-body {
  overflow-y: auto;
  overflow-x: hidden;
  -webkit-overflow-scrolling: touch;
  padding: .35rem 0 1rem;
}

/* ─── Setting groups ─────────────────────── */
.setting-group {
  padding: .6rem 1rem;
  border-bottom: 1px solid var(--border);
  overflow: hidden;
}

.group-label {
  font-size: .58rem;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--dim);
  margin-bottom: .5rem;
}

.setting-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: .8rem;
  color: var(--text);
  min-height: 30px;
  gap: .5rem;
}
.setting-row + .setting-row { margin-top: .2rem; }
/* left label should truncate, not push right side offscreen */
.setting-row > span:first-child {
  flex-shrink: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* Toggle button */
.tog {
  font-family: var(--mono);
  font-size: .65rem;
  letter-spacing: 1px;
  padding: .22rem .7rem;
  border-radius: 20px;
  border: 1px solid var(--border);
  min-width: 46px;
  text-align: center;
  cursor: pointer;
  touch-action: manipulation;
  flex-shrink: 0;
  transition: background .15s, color .15s, border-color .15s;
}
.tog[data-on="true"]  { background: var(--accent); color: var(--bg); border-color: var(--accent); }
.tog[data-on="false"] { background: var(--surface2); color: var(--dim); }

/* Range input row */
.range-row {
  display: flex;
  align-items: center;
  gap: .5rem;
  flex-shrink: 0;
}
.range-row input[type=range] {
  width: 90px;
  accent-color: var(--accent);
  flex-shrink: 0;
}
.range-row span {
  font-size: .7rem;
  color: var(--dim);
  min-width: 42px;
  text-align: right;
  white-space: nowrap;
}

/* Size buttons */
.size-btns { display: flex; gap: 3px; flex-shrink: 0; }
.size-btns button, .wave-btns button {
  font-family: var(--mono);
  font-size: .7rem;
  border-radius: 5px;
  border: 1px solid var(--border);
  background: var(--surface2);
  color: var(--dim);
  cursor: pointer;
  touch-action: manipulation;
  flex-shrink: 0;
  transition: background .12s, color .12s, border-color .12s;
}
.size-btns button { width: 28px; height: 28px; }
.wave-btns { display: flex; gap: 3px; flex-shrink: 0; }
.wave-btns button { padding: .22rem .55rem; white-space: nowrap; }
.size-btns button.on, .wave-btns button.on {
  background: var(--accent);
  color: var(--bg);
  border-color: var(--accent);
}

/* Theme grid — 4 columns on wider screens */
.theme-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: .4rem;
  width: 100%;
}
@media (min-width: 480px) {
  .theme-grid { grid-template-columns: repeat(4, 1fr); }
}

.theme-card {
  border-radius: 8px;
  border: 2px solid var(--border);
  overflow: hidden;
  cursor: pointer;
  touch-action: manipulation;
  min-width: 0;
  transition: border-color .15s;
}
.theme-card.on { border-color: var(--accent); }

.theme-preview {
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 0 6px;
}
.theme-preview-dot  { width: 7px;  height: 7px;  border-radius: 50%; flex-shrink: 0; }
.theme-preview-dash { width: 18px; height: 7px;  border-radius: 3px; flex-shrink: 0; }

.theme-name {
  font-size: .58rem;
  letter-spacing: .5px;
  text-align: center;
  padding: .2rem 0;
  background: var(--surface);
  color: var(--text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* Reset button */
.reset-btn {
  display: block;
  width: calc(100% - 2rem);
  margin: .6rem 1rem 0;
  font-family: var(--mono);
  font-size: .72rem;
  letter-spacing: 1px;
  padding: .45rem;
  border-radius: 7px;
  border: 1px solid var(--border);
  background: var(--surface2);
  color: var(--dim);
  cursor: pointer;
  touch-action: manipulation;
  transition: color .15s, border-color .15s;
}
.reset-btn:active { color: var(--red); border-color: var(--red); }

/* ─── Fixed keyboard ──────────────────────── */
.keyboard {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  z-index: 100;
  width: 100%;
  background: var(--bg);
  border-top: 1px solid var(--border);
  /* safe area: bottom for home bar, sides for notch phones */
  padding-bottom: env(safe-area-inset-bottom, 0px);
  padding-left: env(safe-area-inset-left, 0px);
  padding-right: env(safe-area-inset-right, 0px);
  overflow: hidden;
}

/* Pending bar */
.pending-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 8px 12px;
  border-bottom: 1px solid var(--border);
  min-height: 36px;
  overflow: hidden;
}

.pend-syms  {
  font-size: 16px; color: var(--accent);
  letter-spacing: 3px;
  min-width: 28px; text-align: right;
  overflow: hidden;
}
.pend-arrow { font-size: 13px; color: var(--dim); flex-shrink: 0; }
.pend-char  { font-size: 17px; color: var(--text); min-width: 14px; }

/* Main buttons */
.kb-main {
  display: flex;
  gap: 1px;
  background: var(--border);
  width: 100%;
}

.kb-btn {
  flex: 1;
  min-width: 0;
  background: var(--surface);
  border: none;
  cursor: pointer;
  touch-action: manipulation;
  user-select: none; -webkit-user-select: none;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 20px 0;
  min-height: 84px;
  transition: background .07s;
}
.kb-btn:active   { background: var(--surface2); }
.dot-btn:active  { background: color-mix(in srgb, var(--accent) 12%, var(--surface)); }
.dash-btn:active { background: color-mix(in srgb, var(--accent) 20%, var(--surface)); }

.kb-sym { font-size: 34px; color: var(--accent); line-height: 1; }
.kb-lbl { font-size: 10px; color: var(--dim); letter-spacing: 1px; }

/* Util row */
.kb-util {
  display: flex;
  gap: 1px;
  background: var(--border);
  width: 100%;
}

.kb-util-btn {
  flex: 1;
  min-width: 0;
  background: var(--surface2);
  border: none;
  color: var(--dim);
  font-family: var(--mono);
  font-size: 14px;
  letter-spacing: 1px;
  padding: 18px 0;
  min-height: 56px;
  cursor: pointer;
  touch-action: manipulation;
  user-select: none; -webkit-user-select: none;
  white-space: nowrap;
  overflow: hidden;
  transition: background .08s, color .08s;
}
.kb-util-btn:active { background: var(--border); color: var(--text); }
.kb-space           { flex: 2; }
.kb-clear:active    { color: var(--red); }

/* ─── Keyboard size variants ─────────────── */
/* S — compact */
.kb-size-sm .pending-bar  { min-height: 26px; padding: 4px 12px; }
.kb-size-sm .pend-syms    { font-size: 12px; }
.kb-size-sm .pend-arrow   { font-size: 10px; }
.kb-size-sm .pend-char    { font-size: 13px; }
.kb-size-sm .kb-btn       { padding: 10px 0; min-height: 54px; gap: 3px; }
.kb-size-sm .kb-sym       { font-size: 24px; }
.kb-size-sm .kb-lbl       { font-size: 9px; }
.kb-size-sm .kb-util-btn  { padding: 10px 0; min-height: 40px; font-size: 12px; }

/* L — large */
.kb-size-lg .pending-bar  { min-height: 44px; padding: 10px 12px; }
.kb-size-lg .pend-syms    { font-size: 20px; }
.kb-size-lg .pend-arrow   { font-size: 15px; }
.kb-size-lg .pend-char    { font-size: 21px; }
.kb-size-lg .kb-btn       { padding: 28px 0; min-height: 110px; gap: 6px; }
.kb-size-lg .kb-sym       { font-size: 44px; }
.kb-size-lg .kb-lbl       { font-size: 11px; }
.kb-size-lg .kb-util-btn  { padding: 22px 0; min-height: 68px; font-size: 16px; }

/* Hold-to-clear animation */
.kb-clear.holding {
  color: var(--red);
  animation: clear-charge 0.6s linear forwards;
}
@keyframes clear-charge {
  0%   { background: var(--surface2); }
  100% { background: color-mix(in srgb, var(--red) 28%, var(--surface2)); }
}