/* ══════════════════════════════════════════════════════════════
   Controls — Material / Paper-Elements inspired interactive atoms.
   Buttons, ripples, sliders, switches, selects, text fields, tabs.
   Every control carries hover / focus / active / disabled states.
   ══════════════════════════════════════════════════════════════ */

/* ─────────────────────────────────────────────
   Ripple — shared by every clickable control.
   Spawned by src/ui/ripple.js, centred on the
   pointer; keyboard activation centres it.
   ───────────────────────────────────────────── */
.ripple-host { position: relative; overflow: hidden; isolation: isolate; }

.ripple {
  position: absolute;
  border-radius: 50%;
  transform: scale(0);
  background: currentColor;
  opacity: .28;
  pointer-events: none;
  z-index: 0;
  animation: ripple-out 560ms var(--ease-decel) forwards;
}
@keyframes ripple-out {
  to { transform: scale(2.4); opacity: 0; }
}
@media (prefers-reduced-motion: reduce) {
  /* Keep the feedback, drop the travel: a brief flat wash instead. */
  .ripple { animation: ripple-flash 160ms linear forwards; transform: scale(2.4); }
  @keyframes ripple-flash { from { opacity: .22; } to { opacity: 0; } }
}

/* ─────────────────────────────────────────────
   Buttons
   ───────────────────────────────────────────── */
.btn {
  --btn-bg: var(--surf-2);
  --btn-fg: var(--text);
  --btn-line: var(--line-2);

  position: relative;
  overflow: hidden;
  isolation: isolate;
  display: inline-flex;
  align-items: center;
  gap: 14px;
  padding: 13px 22px;
  min-height: 48px;
  border: 1px solid var(--btn-line);
  border-radius: var(--r-md);
  background: var(--btn-bg);
  color: var(--btn-fg);
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  box-shadow: var(--e-1);
  transition:
    background-color var(--t-fast) var(--ease-standard),
    border-color     var(--t-fast) var(--ease-standard),
    box-shadow       var(--t-med)  var(--ease-standard),
    transform        var(--t-fast) var(--ease-spring),
    filter           var(--t-fast) var(--ease-standard);
}

/* State layer — Material's tinted overlay for hover/press. */
.btn::before {
  content: "";
  position: absolute;
  inset: 0;
  background: currentColor;
  opacity: 0;
  transition: opacity var(--t-fast) var(--ease-standard);
  pointer-events: none;
  z-index: -1;
}
.btn:hover::before          { opacity: .08; }
.btn:active::before         { opacity: .14; }
.btn:hover                  { box-shadow: var(--e-2); transform: translateY(-1px); }
.btn:active                 { box-shadow: var(--e-1); transform: translateY(0) scale(.985); }
.btn[disabled],
.btn[aria-disabled="true"]  { opacity: .38; pointer-events: none; box-shadow: none; }

.btn__icon {
  display: grid;
  place-items: center;
  width: 34px;
  min-width: 34px;
  font-size: 22px;
  line-height: 1;
  filter: saturate(1.1);
}
.btn__body { display: flex; flex-direction: column; gap: 1px; min-width: 0; }
.btn__body b     { font-size: 16px; font-weight: 700; letter-spacing: .01em; }
.btn__body small { font-size: 12.5px; color: var(--text-2); font-weight: 500; }

.btn--primary {
  --btn-bg: var(--primary);
  --btn-fg: var(--on-primary);
  --btn-line: transparent;
  box-shadow: var(--e-2), var(--glow-primary);
}
.btn--primary .btn__body small { color: #04121fbb; }
.btn--primary:hover { box-shadow: var(--e-3), var(--glow-primary); }

.btn--accent {
  --btn-bg: var(--accent);
  --btn-fg: var(--on-accent);
  --btn-line: transparent;
  box-shadow: var(--e-2), var(--glow-accent);
}
.btn--accent .btn__body small { color: #1a1200bb; }
.btn--accent:hover { box-shadow: var(--e-3), var(--glow-accent); }

.btn--ghost {
  --btn-bg: transparent;
  --btn-line: var(--line-2);
  box-shadow: none;
}
.btn--ghost:hover { --btn-line: var(--primary); box-shadow: var(--e-1); }

.btn--danger { --btn-bg: var(--danger-dim); --btn-fg: #fff; --btn-line: transparent; }

.btn--icon {
  padding: 0;
  width: 44px;
  min-width: 44px;
  height: 44px;
  min-height: 44px;
  justify-content: center;
  border-radius: var(--r-full);
  font-size: 19px;
  background: var(--surf-2);
}
.btn--sm { min-height: 34px; padding: 6px 14px; font-size: 13px; border-radius: var(--r-sm); }
.btn--lg { min-height: 60px; padding: 18px 38px; font-size: 18px; border-radius: var(--r-lg); }
.btn--block { width: 100%; justify-content: flex-start; }

/* ─────────────────────────────────────────────
   Text field — floating label, animated underline
   ───────────────────────────────────────────── */
.field { position: relative; margin: 18px 0 8px; }

.field__input {
  width: 100%;
  padding: 20px 14px 8px;
  background: var(--surf-2);
  border: 1px solid var(--line-2);
  border-bottom-width: 1px;
  border-radius: var(--r-sm) var(--r-sm) 0 0;
  color: var(--text);
  letter-spacing: .22em;
  text-transform: uppercase;
  font-family: var(--font-mono);
  transition: background-color var(--t-fast), border-color var(--t-fast);
}
.field__input:hover { background: var(--surf-3); }
.field__input:focus { outline: none; background: var(--surf-3); }

.field__label {
  position: absolute;
  left: 15px;
  top: 15px;
  color: var(--text-3);
  font-size: 15px;
  letter-spacing: 0;
  text-transform: none;
  pointer-events: none;
  transform-origin: left top;
  transition: transform var(--t-med) var(--ease-emph), color var(--t-fast);
}
.field__input:focus + .field__label,
.field__input:not(:placeholder-shown) + .field__label {
  transform: translateY(-11px) scale(.74);
  color: var(--primary);
}

/* Underline that grows from the centre on focus. */
.field__bar {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 2px;
  background: var(--primary);
  transform: scaleX(0);
  transition: transform var(--t-med) var(--ease-emph);
}
.field__input:focus ~ .field__bar { transform: scaleX(1); }
.field__input:user-invalid ~ .field__bar { background: var(--danger); transform: scaleX(1); }
.field__input:user-invalid + .field__label { color: var(--danger); }

/* ─────────────────────────────────────────────
   Slider
   ───────────────────────────────────────────── */
.slider { display: grid; gap: 6px; }
.slider__top { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; }
.slider__name { font-weight: 600; font-size: 14px; }
.slider__val {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--primary);
  font-variant-numeric: tabular-nums;
}

.slider__input {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 34px;
  background: transparent;
  cursor: pointer;
}
.slider__input::-webkit-slider-runnable-track {
  height: 5px;
  border-radius: var(--r-full);
  background: linear-gradient(
    to right,
    var(--primary) 0 calc(var(--fill, 50%)),
    var(--surf-hi) calc(var(--fill, 50%)) 100%);
}
.slider__input::-moz-range-track {
  height: 5px;
  border-radius: var(--r-full);
  background: var(--surf-hi);
}
.slider__input::-moz-range-progress {
  height: 5px;
  border-radius: var(--r-full);
  background: var(--primary);
}
.slider__input::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 17px; height: 17px;
  margin-top: -6px;
  border-radius: 50%;
  background: var(--primary);
  border: none;
  box-shadow: 0 0 0 0 var(--primary-wash), var(--e-1);
  transition: box-shadow var(--t-fast), transform var(--t-fast) var(--ease-spring);
}
.slider__input::-moz-range-thumb {
  width: 17px; height: 17px;
  border-radius: 50%;
  background: var(--primary);
  border: none;
  box-shadow: 0 0 0 0 var(--primary-wash), var(--e-1);
  transition: box-shadow var(--t-fast), transform var(--t-fast) var(--ease-spring);
}
/* Halo on hover/focus — the Paper-Elements touch target made visible. */
.slider__input:hover::-webkit-slider-thumb        { box-shadow: 0 0 0 9px var(--primary-wash), var(--e-1); }
.slider__input:focus-visible::-webkit-slider-thumb { box-shadow: 0 0 0 12px var(--primary-wash), var(--e-1); }
.slider__input:active::-webkit-slider-thumb        { transform: scale(1.18); }
.slider__input:hover::-moz-range-thumb            { box-shadow: 0 0 0 9px var(--primary-wash), var(--e-1); }
.slider__input:focus-visible::-moz-range-thumb     { box-shadow: 0 0 0 12px var(--primary-wash), var(--e-1); }
.slider__input:focus { outline: none; }

/* ─────────────────────────────────────────────
   Switch (toggle)
   ───────────────────────────────────────────── */
.switch {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 9px 0;
  cursor: pointer;
  user-select: none;
}
.switch__text { display: grid; gap: 1px; }
.switch__name { font-weight: 600; font-size: 14px; }
.switch__hint { font-size: 12.5px; color: var(--text-3); }

.switch__box { position: relative; flex: none; }
.switch__input { position: absolute; opacity: 0; width: 100%; height: 100%; margin: 0; cursor: pointer; }

.switch__track {
  display: block;
  width: 52px; height: 32px;
  border-radius: var(--r-full);
  background: var(--surf-hi);
  border: 2px solid var(--line-2);
  transition: background-color var(--t-med) var(--ease-standard),
              border-color var(--t-med) var(--ease-standard);
}
.switch__thumb {
  position: absolute;
  top: 50%; left: 8px;
  width: 16px; height: 16px;
  margin-top: -8px;
  border-radius: 50%;
  background: var(--text-3);
  box-shadow: 0 0 0 0 var(--primary-wash);
  transition: transform var(--t-med) var(--ease-spring),
              width var(--t-med) var(--ease-spring),
              height var(--t-med) var(--ease-spring),
              margin var(--t-med) var(--ease-spring),
              background-color var(--t-med), box-shadow var(--t-fast);
  pointer-events: none;
}
.switch__input:checked ~ .switch__track {
  background: var(--primary);
  border-color: var(--primary);
}
.switch__input:checked ~ .switch__thumb {
  transform: translateX(20px);
  width: 22px; height: 22px;
  margin-top: -11px; margin-left: -3px;
  background: var(--on-primary);
}
.switch__input:focus-visible ~ .switch__thumb { box-shadow: 0 0 0 10px var(--primary-wash); }
.switch:hover .switch__thumb                  { box-shadow: 0 0 0 8px #ffffff12; }
.switch__input:active ~ .switch__thumb        { width: 24px; height: 24px; margin-top: -12px; }
.switch__input:disabled ~ .switch__track      { opacity: .38; }

/* ─────────────────────────────────────────────
   Select
   ───────────────────────────────────────────── */
.select-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 9px 0;
}
.select-wrap { position: relative; flex: none; }
.select-wrap::after {
  content: "▾";
  position: absolute;
  right: 13px; top: 50%;
  transform: translateY(-50%);
  color: var(--text-2);
  pointer-events: none;
  font-size: 12px;
}
.select {
  -webkit-appearance: none;
  appearance: none;
  min-width: 168px;
  padding: 10px 36px 10px 14px;
  background: var(--surf-2);
  border: 1px solid var(--line-2);
  border-radius: var(--r-sm);
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  transition: background-color var(--t-fast), border-color var(--t-fast);
}
.select:hover { background: var(--surf-3); border-color: var(--primary-dim); }
.select:focus-visible { border-color: var(--primary); }
.select option { background: var(--surf-3); color: var(--text); }

/* ─────────────────────────────────────────────
   Tabs
   ───────────────────────────────────────────── */
.tabs {
  display: flex;
  gap: 4px;
  padding: 0 22px;
  border-bottom: 1px solid var(--line);
  overflow-x: auto;
  scrollbar-width: none;
}
.tabs::-webkit-scrollbar { display: none; }

.tab {
  position: relative;
  overflow: hidden;
  isolation: isolate;
  padding: 14px 18px;
  background: none;
  border: 0;
  color: var(--text-2);
  font-weight: 600;
  font-size: 14px;
  cursor: pointer;
  white-space: nowrap;
  transition: color var(--t-fast);
}
.tab::before {
  content: "";
  position: absolute; inset: 0;
  background: currentColor; opacity: 0;
  transition: opacity var(--t-fast);
  z-index: -1;
}
.tab:hover::before { opacity: .07; }
.tab::after {
  content: "";
  position: absolute;
  left: 12px; right: 12px; bottom: 0;
  height: 3px;
  border-radius: 3px 3px 0 0;
  background: var(--primary);
  transform: scaleX(0);
  transition: transform var(--t-med) var(--ease-emph);
}
.tab[aria-selected="true"] { color: var(--primary); }
.tab[aria-selected="true"]::after { transform: scaleX(1); }

/* ─────────────────────────────────────────────
   Dialog
   ───────────────────────────────────────────── */
.dlg {
  width: min(680px, calc(100vw - 32px));
  max-height: min(86vh, 760px);
  padding: 0;
  border: 1px solid var(--line-2);
  border-radius: var(--r-lg);
  background: var(--surf-3);
  color: var(--text);
  box-shadow: var(--e-4);
  overflow: hidden;
}
.dlg--slim { width: min(400px, calc(100vw - 32px)); }

.dlg::backdrop {
  background: #05070bcc;
  backdrop-filter: blur(6px) saturate(.7);
}
.dlg[open] { animation: dlg-in var(--t-med) var(--ease-decel); }
.dlg[open]::backdrop { animation: fade-in var(--t-med) var(--ease-standard); }
@keyframes dlg-in {
  from { opacity: 0; transform: translateY(14px) scale(.97); }
}
@keyframes fade-in { from { opacity: 0; } }

.dlg__form { display: flex; flex-direction: column; max-height: inherit; min-height: 0; }
.dlg__head {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; padding: 20px 22px 14px;
}
.dlg__head h2 { font-size: 21px; }
.dlg__body {
  padding: 18px 22px;
  overflow-y: auto;
  min-height: 0;
  flex: 1;
}
.dlg__foot {
  display: flex; justify-content: flex-end; gap: 10px;
  padding: 14px 22px 20px;
  border-top: 1px solid var(--line);
  background: var(--surf-2);
}

/* ─────────────────────────────────────────────
   Settings groups
   ───────────────────────────────────────────── */
.group { margin-bottom: 26px; }
.group:last-child { margin-bottom: 4px; }
.group__title {
  font-size: 11.5px;
  text-transform: uppercase;
  letter-spacing: .13em;
  color: var(--primary);
  font-weight: 700;
  margin-bottom: 10px;
  padding-bottom: 7px;
  border-bottom: 1px solid var(--line);
}
.group > * + * { margin-top: 13px; }

/* Keybinding grid */
.binds { display: grid; grid-template-columns: 1fr auto auto; gap: 7px 12px; align-items: center; }
.binds__head {
  font-size: 11px; text-transform: uppercase; letter-spacing: .1em;
  color: var(--text-3); font-weight: 700; padding-bottom: 3px;
}
.binds__name { font-size: 14px; font-weight: 600; }
.keycap {
  min-width: 92px;
  padding: 8px 12px;
  background: var(--surf-1);
  border: 1px solid var(--line-2);
  border-bottom-width: 3px;
  border-radius: var(--r-sm);
  font-family: var(--font-mono);
  font-size: 12px;
  text-align: center;
  color: var(--text);
  cursor: pointer;
  transition: all var(--t-fast) var(--ease-standard);
  position: relative; overflow: hidden; isolation: isolate;
}
.keycap:hover  { border-color: var(--primary); color: var(--primary); transform: translateY(-1px); }
.keycap:active { transform: translateY(1px); border-bottom-width: 1px; }
.keycap[data-listening="true"] {
  border-color: var(--accent);
  color: var(--accent);
  animation: pulse-bind 900ms ease-in-out infinite;
}
@keyframes pulse-bind { 50% { background: var(--accent-wash); } }
.keycap--conflict { border-color: var(--danger); color: var(--danger); }

.bind { padding: 34px 26px; text-align: center; }
.bind h2 { font-size: 20px; margin-bottom: 10px; }
.bind__what { color: var(--accent); font-weight: 700; font-size: 16px; margin-bottom: 14px; }
.bind__hint { color: var(--text-3); font-size: 12.5px; }