/* =========================================================
   Components
   ========================================================= */

/* ---------- Buttons ---------- */

/*
  Keycap buttons. Every variant follows one colour rule:
    face  (--btn-bg)    the button's colour
    rim   (--btn-line)  a softer outline of the same colour
    edge  (--btn-edge)  a firmer bottom edge, the rim pushed towards the text
                        colour (or the face darkened, for solid buttons)
  so every key has the same depth. Variants set only face, ink and rim.

  Hover is the sweep: a slanted panel (--btn-sweep) wipes across from the
  centre and the label flips to --btn-sweep-fg, inverting the button.
*/
.btn{
  --btn-bg:var(--surface);
  --btn-fg:var(--text);
  --btn-line:var(--line);
  --btn-edge:color-mix(in srgb, var(--btn-line) 72%, var(--text));
  --btn-sweep:var(--text);
  --btn-sweep-fg:var(--paper);
  position:relative;
  isolation:isolate;
  overflow:hidden;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  height:var(--control-h);
  padding:0 17px;
  border:1px solid var(--btn-line);
  border-bottom:3px solid var(--btn-edge);
  border-radius:11px;
  background:var(--btn-bg);
  box-shadow:inset 0 1px 0 color-mix(in srgb, #fff 7%, transparent);
  color:var(--btn-fg);
  font-size:var(--fs-sm);
  font-weight:600;
  letter-spacing:.01em;
  line-height:1;
  white-space:nowrap;
  cursor:pointer;
  user-select:none;
  /* The label flips once the sweep has passed the middle, so it never sits on the wrong colour. */
  transition:color .2s var(--ease-out) .14s, border-color .3s var(--ease-out), transform var(--dur-1) var(--ease-out), border-bottom-width var(--dur-1) var(--ease-out);
}
/* The sweep panel sits above the face and below the label (isolation keeps it inside the button). */
.btn::after{
  content:"";
  position:absolute;
  z-index:-1;
  inset:0 -28px;
  background:var(--btn-sweep);
  transform:skewX(-45deg) scaleX(0);
  transition:transform .5s var(--ease-out);
}

.btn .i{ width:15px; height:15px; stroke-width:1.9; }
.btn:hover:not(:disabled){ color:var(--btn-sweep-fg); border-color:var(--btn-sweep); }
.btn:hover:not(:disabled)::after{ transform:skewX(-45deg) scaleX(1); }
/* pressed: the key goes down onto its edge */
.btn:active:not(:disabled){ transform:translateY(2px); border-bottom-width:1px; }
.btn:focus-visible{ outline:2px solid var(--accent-line); outline-offset:2px; }
.btn:disabled{ opacity:.45; cursor:not-allowed; }

/* Solid faces: the edge is the face itself, darkened. */
.btn-primary{
  --btn-bg:var(--accent);
  --btn-fg:var(--on-accent);
  --btn-line:var(--accent);
  --btn-edge:color-mix(in srgb, var(--accent) 62%, #000);
  --btn-sweep:var(--surface);
  --btn-sweep-fg:var(--accent-text);
  box-shadow:inset 0 1px 0 rgba(255, 255, 255, .28);
}
.btn-primary:hover:not(:disabled){ border-color:var(--accent); }

.btn-danger{
  --btn-bg:var(--bad);
  --btn-fg:#fff;
  --btn-line:var(--bad);
  --btn-edge:color-mix(in srgb, var(--bad) 62%, #000);
  --btn-sweep:color-mix(in srgb, var(--bad) 70%, #000);
  --btn-sweep-fg:#fff;
  box-shadow:inset 0 1px 0 rgba(255, 255, 255, .22);
}

/* Surface faces with a tinted rim: ghost (neutral), AI (accent), danger (red). */
.btn-ghost{ --btn-line:var(--line); }

.btn-ai{
  --btn-fg:var(--accent-text);
  --btn-line:var(--accent-line);
  --btn-sweep:var(--accent);
  --btn-sweep-fg:var(--on-accent);
}
.btn-ai .i{ stroke-width:1.8; }
.btn-ai:disabled{
  opacity:1;
  background:linear-gradient(100deg, var(--surface) 30%, var(--accent-wash-strong) 50%, var(--surface) 70%) 0 0 / 250% 100%;
  animation:ai-busy 1.4s linear infinite;
}
@keyframes ai-busy{ to{ background-position:-150% 0; } }

.btn-danger-ghost{
  --btn-fg:var(--bad);
  --btn-line:var(--bad-line);
  --btn-sweep:var(--bad);
  --btn-sweep-fg:#fff;
}

.btn-sm{ height:var(--control-h-sm); padding:0 12px; gap:6px; font-size:var(--fs-xs); border-radius:9px; border-bottom-width:2px; }
.btn-sm:active:not(:disabled){ transform:translateY(1px); border-bottom-width:1px; }
.btn-sm .i{ width:14px; height:14px; }
.btn-lg{ height:var(--control-h-lg); padding:0 var(--s-5); font-size:var(--fs-base); border-radius:13px; }
.btn-block{ width:100%; }

.icon-btn{
  display:inline-grid;
  place-items:center;
  width:34px;
  height:34px;
  flex:none;
  border-radius:var(--r-sm);
  color:var(--text-2);
  transition:background-color var(--dur-1) var(--ease-out), color var(--dur-1) var(--ease-out), transform var(--dur-1) var(--ease-out);
}
.icon-btn .i{ width:18px; height:18px; }
.icon-btn:hover:not(:disabled){ background:var(--hover); color:var(--text); }
.icon-btn:active:not(:disabled){ transform:scale(.92); }
.icon-btn-sm{ width:28px; height:28px; }
.icon-btn-sm .i{ width:15px; height:15px; }
.icon-btn-xs{ width:24px; height:24px; border-radius:var(--r-xs); }
.icon-btn-xs .i{ width:14px; height:14px; }
.icon-btn-lg{ width:var(--control-h-lg); height:var(--control-h-lg); border:1px solid var(--line); }
.icon-btn-danger:hover:not(:disabled){ background:var(--bad-wash); color:var(--bad); }
/* a count inside a button: a plain number after a hairline, never a bubble */
.btn-count{ display:inline-flex; align-items:center; align-self:stretch; margin:9px 0 9px 3px; padding-left:10px; border-left:1px solid color-mix(in srgb, currentColor 22%, transparent); color:color-mix(in srgb, currentColor 62%, transparent); font-variant-numeric:tabular-nums; }
/* close buttons: just the cross, no square; it brightens and turns a quarter on hover */
.x-btn, .x-btn:hover:not(:disabled), .toast.is-sticky:hover .x-btn{ border:0 !important; background:none !important; box-shadow:none !important; backdrop-filter:none !important; }
.x-btn{ color:var(--text-3); }
.x-btn:hover:not(:disabled){ color:var(--text); }
.x-btn .i{ transition:transform var(--dur-2) var(--ease-out); }
.x-btn:hover:not(:disabled) .i{ transform:rotate(90deg); }
.x-btn:focus-visible{ outline:2px solid var(--accent-line); outline-offset:2px; border-radius:50%; }

.spinner{
  width:15px;
  height:15px;
  flex:none;
  border:2px solid currentColor;
  border-right-color:transparent;
  border-radius:50%;
  animation:spin .7s linear infinite;
}

/* ---------- Form controls ---------- */

input[type="text"],
input[type="password"],
input[type="email"],
input[type="search"],
input[type="number"],
textarea{
  width:100%;
  min-height:var(--control-h);
  padding:9px var(--s-3);
  background:var(--surface-sunken);
  border:1px solid var(--line);
  border-radius:var(--r-sm);
  color:var(--text);
  font-size:var(--fs-sm);
  line-height:1.5;
  transition:border-color var(--dur-1) var(--ease-out), box-shadow var(--dur-2) var(--ease-out), background-color var(--dur-1);
}

textarea{ resize:vertical; min-height:88px; }

input::placeholder,
textarea::placeholder{ color:var(--text-3); }

input:hover:not(:disabled),
textarea:hover:not(:disabled){ border-color:var(--line-strong); }

input:focus,
textarea:focus{
  border-color:var(--accent-line);
  box-shadow:var(--ring);
  outline:none;
}

input[type="number"]{ -moz-appearance:textfield; }
input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button{ -webkit-appearance:none; margin:0; }
input[type="search"]::-webkit-search-cancel-button{ -webkit-appearance:none; }

.form-stack{ display:grid; gap:var(--s-4); }

.field{ display:grid; gap:var(--s-2); min-width:0; }

.field-grid{
  display:grid;
  grid-template-columns:repeat(2, minmax(0, 1fr));
  gap:var(--s-4);
}

.field-label{
  display:inline-flex;
  align-items:center;
  gap:var(--s-2);
  color:var(--text-2);
  font-size:var(--fs-xs);
  font-weight:500;
}
.field-label .i{ width:15px; height:15px; color:var(--text-3); }

.field-label-row{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:var(--s-3);
  min-height:24px;
}
.field-label-row > div{ display:flex; flex-direction:column; gap:2px; }

.field-hint{ color:var(--text-3); font-size:var(--fs-xs); }

.form-error{
  min-height:0;
  color:var(--bad);
  font-size:var(--fs-xs);
  font-weight:500;
}
.form-error:empty{ display:none; }

.form-section{
  margin-top:var(--s-6);
  padding-top:var(--s-5);
  border-top:1px solid var(--line-soft);
}
.modal-body > .form-section:first-child{ margin-top:0; padding-top:0; border-top:0; }
.form-section-title{
  display:flex;
  align-items:center;
  gap:var(--s-2);
  margin-bottom:var(--s-4);
  font-size:var(--fs-sm);
  font-weight:600;
}
.form-section-title .i{ color:var(--text-3); }

/* switch */
.switch{
  position:relative;
  display:inline-flex;
  flex:none;
  cursor:pointer;
}
.switch input{ position:absolute; inset:0; opacity:0; cursor:pointer; margin:0; }
.switch-track{
  position:relative;
  width:36px;
  height:20px;
  border-radius:var(--r-pill);
  background:var(--line);
  transition:background-color var(--dur-2) var(--ease-out);
}
.switch-track::after{
  content:"";
  position:absolute;
  top:2px;
  left:2px;
  width:16px;
  height:16px;
  border-radius:50%;
  background:var(--text);
  box-shadow:var(--shadow-sm);
  transition:transform var(--dur-2) var(--ease-spring), background-color var(--dur-2);
}
.switch input:checked + .switch-track{ background:var(--accent); }
.switch input:checked + .switch-track::after{ transform:translateX(16px); background:var(--on-accent); }
.switch input:focus-visible + .switch-track{ box-shadow:var(--ring); }

/* segmented control */
.segmented{
  display:inline-grid;
  grid-auto-flow:column;
  grid-auto-columns:1fr;
  gap:2px;
  padding:3px;
  border:1px solid var(--line);
  border-radius:var(--r-sm);
  background:var(--surface-sunken);
}
.segmented button{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:var(--s-2);
  height:32px;
  padding:0 var(--s-4);
  border-radius:calc(var(--r-sm) - 3px);
  color:var(--text-2);
  font-size:var(--fs-sm);
  font-weight:500;
  transition:background-color var(--dur-2) var(--ease-out), color var(--dur-2);
}
.segmented button .i{ width:15px; height:15px; }
/* the highlight slides between options (see placeSegmentThumb in ui.js) */
.segmented{ position:relative; }
.segmented > button{ position:relative; z-index:1; }
.segmented > .seg-thumb{ position:absolute; top:3px; bottom:3px; left:0; width:0; border-radius:calc(var(--r-sm) - 3px); background:var(--surface); box-shadow:var(--shadow-sm), 0 0 0 1px var(--line); opacity:0; pointer-events:none; transition:transform 340ms cubic-bezier(.3, 1.25, .5, 1), width 340ms cubic-bezier(.3, 1.25, .5, 1); }
.segmented.has-thumb > .seg-thumb{ opacity:1; }
.segmented.has-thumb > button.active{ background:none; box-shadow:none; }
@media (prefers-reduced-motion: reduce){ .segmented > .seg-thumb{ transition:none; } }
.segmented button:hover{ color:var(--text); }
.segmented button.active{ background:var(--surface); color:var(--text); box-shadow:var(--shadow-sm), 0 0 0 1px var(--line); }

/* custom select */
.select{ position:relative; }
.select-trigger{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:var(--s-2);
  width:100%;
  height:var(--control-h);
  padding:0 var(--s-3);
  border:1px solid var(--line);
  border-radius:var(--r-sm);
  background:var(--surface-sunken);
  font-size:var(--fs-sm);
  text-align:left;
  transition:border-color var(--dur-1);
}
.select-trigger span{ overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
.select-trigger .i{ color:var(--text-3); transition:transform var(--dur-2) var(--ease-out); }
.select-trigger:hover:not(:disabled){ border-color:var(--line-strong); }
.select-trigger:disabled{ opacity:.5; }
.select:has(.select-menu.open) .select-trigger{ border-color:var(--accent-line); box-shadow:var(--ring); }
.select:has(.select-menu.open) .select-trigger .i{ transform:rotate(180deg); }

.select-menu{
  position:absolute;
  z-index:20;
  top:calc(100% + 6px);
  left:0;
  right:0;
  max-height:240px;
  overflow:auto;
  padding:var(--s-1);
  border:1px solid var(--line);
  border-radius:var(--r-sm);
  background:var(--surface);
  box-shadow:var(--shadow-md);
  opacity:0;
  visibility:hidden;
  transform:translateY(-4px);
  transition:opacity var(--dur-1) var(--ease-out), transform var(--dur-2) var(--ease-out), visibility var(--dur-1);
}
.select-menu.open{ opacity:1; visibility:visible; transform:none; }
.select-option{
  display:flex;
  align-items:center;
  gap:var(--s-2);
  width:100%;
  padding:8px var(--s-3);
  border-radius:var(--r-xs);
  font-size:var(--fs-sm);
  text-align:left;
}
.select-option .i{ width:15px; height:15px; color:var(--text-3); }
.select-option:hover{ background:var(--hover); }
.select-option.selected{ background:var(--accent-wash); color:var(--accent-text); }
.select-dot{ width:8px; height:8px; flex:none; border-radius:50%; }
.select-empty{ padding:10px var(--s-3); color:var(--text-3); font-size:var(--fs-xs); }

/* themed dropdowns (enhanceSelect in ui.js): the native select stays, hidden */
.tselect-native{ position:absolute !important; width:1px !important; height:1px !important; overflow:hidden; clip:rect(0 0 0 0); clip-path:inset(50%); white-space:nowrap; opacity:0; pointer-events:none; }
.tselect-trigger{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:var(--s-2);
  width:100%;
  height:var(--control-h);
  padding:0 12px 0 14px;
  border:1px solid var(--line);
  border-radius:var(--r-sm);
  background:var(--surface-sunken);
  color:var(--text);
  font-size:var(--fs-sm);
  text-align:left;
  cursor:pointer;
  transition:border-color var(--dur-1), box-shadow var(--dur-2);
}
.tselect-trigger span{ min-width:0; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
.tselect-trigger .i{ flex:none; width:15px; height:15px; color:var(--text-3); transition:transform var(--dur-2) var(--ease-out); }
.tselect-trigger:hover:not(:disabled){ border-color:var(--line-strong); }
.tselect-trigger:focus-visible, .tselect-trigger.is-open{ border-color:var(--accent-line); box-shadow:var(--ring); outline:none; }
.tselect-trigger.is-open .i{ transform:rotate(180deg); }
.tselect-trigger:disabled{ opacity:.5; cursor:not-allowed; }

.tselect-list{
  position:fixed;
  z-index:700;
  overflow-y:auto;
  padding:5px;
  border:1px solid var(--line);
  border-radius:var(--r-md);
  background:var(--surface);
  box-shadow:var(--shadow-lg);
  scrollbar-width:thin;
  animation:tselect-in var(--dur-2) var(--ease-out);
}
.tselect-list.is-up{ animation-name:tselect-in-up; }
@keyframes tselect-in{ from{ opacity:0; transform:translateY(-4px); } }
@keyframes tselect-in-up{ from{ opacity:0; transform:translateY(4px); } }
.tselect-group{ padding:10px 10px 4px; color:var(--text-3); font-family:var(--font-mono); font-size:var(--fs-2xs); letter-spacing:.1em; text-transform:uppercase; }
.tselect-group:first-child{ padding-top:6px; }
.tselect-option{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:var(--s-3);
  width:100%;
  min-height:34px;
  padding:0 10px;
  border-radius:calc(var(--r-sm) - 2px);
  color:var(--text-2);
  font-size:var(--fs-sm);
  text-align:left;
  white-space:nowrap;
  transition:background-color var(--dur-1), color var(--dur-1);
}
.tselect-option.is-grouped{ padding-left:18px; }
.tselect-option span{ min-width:0; overflow:hidden; text-overflow:ellipsis; }
.tselect-option .i{ flex:none; width:15px; height:15px; color:var(--accent-text); stroke-width:2.2; }
.tselect-option:hover, .tselect-option:focus-visible{ background:var(--hover); color:var(--text); outline:none; }
.tselect-option[aria-selected="true"]{ color:var(--text); font-weight:500; }
.tselect-option:disabled{ opacity:.45; cursor:not-allowed; }

/* colour picker (colorpicker.js) */
.cpick{
  --cp-hue:#f00;
  --cp-color:#808080;
  position:fixed;
  z-index:650;
  display:grid;
  gap:14px;
  width:288px;
  padding:14px;
  border:1px solid var(--line);
  border-radius:var(--r-lg);
  background:var(--surface);
  box-shadow:var(--shadow-lg);
  animation:tselect-in var(--dur-2) var(--ease-out);
}
.cpick-sv{
  position:relative;
  height:190px;
  border-radius:var(--r-md);
  background:linear-gradient(to top, #000, transparent), linear-gradient(to right, #fff, var(--cp-hue));
  box-shadow:inset 0 0 0 1px rgba(0, 0, 0, .12);
  cursor:crosshair;
  touch-action:none;
  outline:none;
}
.cpick-sv-thumb{
  position:absolute;
  width:18px;
  height:18px;
  margin:-9px 0 0 -9px;
  border:2.5px solid #fff;
  border-radius:50%;
  background:var(--cp-color);
  box-shadow:0 0 0 1px rgba(0, 0, 0, .25), 0 2px 6px rgba(0, 0, 0, .35);
  pointer-events:none;
  transition:transform var(--dur-1) var(--ease-out);
}
.cpick-sv.is-dragging .cpick-sv-thumb{ transform:scale(1.15); }
.cpick-sv:focus-visible{ box-shadow:inset 0 0 0 1px rgba(0, 0, 0, .12), var(--ring); }
.cpick-row{ display:flex; align-items:center; gap:12px; }
.cpick-eye{
  display:grid;
  place-items:center;
  flex:none;
  width:38px;
  height:38px;
  border:1px solid var(--line);
  border-bottom:2px solid color-mix(in srgb, var(--line) 72%, var(--text));
  border-radius:10px;
  background:var(--surface-sunken);
  color:var(--text-2);
  transition:color var(--dur-1), border-color var(--dur-1);
}
.cpick-eye:hover{ border-color:var(--line-strong); color:var(--text); }
.cpick-eye .i{ width:17px; height:17px; }
.cpick-hue{
  position:relative;
  flex:1;
  height:12px;
  border-radius:var(--r-pill);
  background:linear-gradient(90deg, #f00 0%, #ff0 17%, #0f0 33%, #0ff 50%, #00f 67%, #f0f 83%, #f00 100%);
  box-shadow:inset 0 0 0 1px rgba(0, 0, 0, .15);
  cursor:pointer;
  touch-action:none;
  outline:none;
}
.cpick-hue-thumb{
  position:absolute;
  top:50%;
  width:18px;
  height:18px;
  margin-left:-9px;
  border:2.5px solid #fff;
  border-radius:50%;
  background:var(--cp-hue);
  box-shadow:0 0 0 1px rgba(0, 0, 0, .25), 0 2px 6px rgba(0, 0, 0, .35);
  translate:0 -50%;
  pointer-events:none;
}
.cpick-hue:focus-visible{ box-shadow:inset 0 0 0 1px rgba(0, 0, 0, .15), var(--ring); }
.cpick-values{ align-items:stretch; }
.cpick-values .tselect-trigger{ flex:none; width:84px; height:38px; padding:0 9px 0 12px; }
.cpick-fields{ display:flex; flex:1; gap:6px; min-width:0; }
.cpick-field{ display:flex; align-items:center; gap:8px; flex:1; min-width:0; height:38px; padding:0 10px; border:1px solid var(--line); border-radius:var(--r-sm); background:var(--surface-sunken); transition:border-color var(--dur-1), box-shadow var(--dur-1); }
.cpick-field:focus-within{ border-color:var(--accent-line); box-shadow:var(--ring); }
.cpick-field i{ flex:none; width:16px; height:16px; border-radius:50%; box-shadow:inset 0 0 0 1px rgba(127, 127, 127, .4); }
.cpick-field input{ width:100%; min-width:0; min-height:0; height:100%; padding:0; border:0; background:none; box-shadow:none; color:var(--text); font-family:var(--font-mono); font-size:var(--fs-xs); outline:none; }
.cpick-hex input{ text-transform:uppercase; }
.cpick-num{ position:relative; padding:0 6px; }
.cpick-num input{ text-align:center; }
.cpick-num span{ position:absolute; bottom:-15px; left:0; right:0; color:var(--text-3); font-family:var(--font-mono); font-size:9.5px; text-align:center; letter-spacing:.08em; }
.cpick-values:has(.cpick-num){ margin-bottom:10px; }
.cpick-saved{ display:grid; gap:10px; padding-top:12px; border-top:1px solid var(--line-soft); }
.cpick-saved-head{ display:flex; justify-content:space-between; align-items:center; color:var(--text-2); font-size:var(--fs-xs); font-weight:600; }
.cpick-add{ display:inline-flex; align-items:center; gap:4px; padding:3px 6px; border-radius:6px; color:var(--text-2); font-size:var(--fs-xs); font-weight:500; transition:color var(--dur-1), background-color var(--dur-1); }
.cpick-add:hover:not(:disabled){ background:var(--hover); color:var(--text); }
.cpick-add:disabled{ opacity:.4; cursor:default; }
.cpick-add .i{ width:13px; height:13px; }
.cpick-swatches{ display:flex; flex-wrap:wrap; gap:6px 7px; }
.cpick-swatch-wrap{ position:relative; }
.cpick-swatch{ display:block; width:22px; height:22px; border-radius:50%; background:var(--sw); box-shadow:inset 0 0 0 1px rgba(127, 127, 127, .35); transition:transform var(--dur-1) var(--ease-out), box-shadow var(--dur-1); }
.cpick-swatch:hover{ transform:scale(1.1); }
.cpick-swatch.is-on{ box-shadow:0 0 0 2px var(--surface), 0 0 0 3.5px var(--sw); }
.cpick-swatch:focus-visible{ outline:2px solid var(--accent); outline-offset:2px; }
.cpick-swatch-remove{ position:absolute; top:-5px; right:-5px; display:grid; place-items:center; width:15px; height:15px; border:1px solid var(--line); border-radius:50%; background:var(--surface); color:var(--text-2); opacity:0; transition:opacity var(--dur-1); }
.cpick-swatch-remove .i{ width:9px; height:9px; stroke-width:2.6; }
.cpick-swatch-wrap:hover .cpick-swatch-remove, .cpick-swatch-remove:focus-visible{ opacity:1; }
.color-field-swatch.is-picking{ box-shadow:inset 0 0 0 1px rgba(127,127,127,.35), 0 0 0 2px var(--surface), 0 0 0 4px var(--accent-line); }

/*
  Search: a plain sunken field with a hairline border, no glow.
  On focus two thin accent lines run from the icon end along the top and bottom
  edges and meet at the far end; the magnifier gives a small turn.
  Leaving the field draws the lines back.
*/
@property --search-trace{ syntax:'<percentage>'; inherits:false; initial-value:0%; }

.search-field{
  position:relative;
  display:flex;
  align-items:center;
  gap:var(--s-2);
  width:min(320px, 100%);
  height:var(--control-h);
  padding:0 var(--s-3);
  border:1px solid var(--line);
  border-radius:calc(var(--radius) * .85);
  background:var(--surface-sunken);
  color:var(--text-3);
  transition:border-color var(--dur-2), color var(--dur-2);
}
/* the traced line: a conic sweep centred on the icon, masked down to the border ring */
.search-field::before{
  --search-trace:0%;
  content:"";
  position:absolute;
  inset:-1px;
  padding:1px;
  border-radius:inherit;
  background:conic-gradient(from -90deg at 50% 50%,
    var(--accent) 0 calc(var(--search-trace) / 2),
    transparent calc(var(--search-trace) / 2) calc(100% - var(--search-trace) / 2),
    var(--accent) calc(100% - var(--search-trace) / 2));
  -webkit-mask:linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite:xor;
  mask:linear-gradient(#000 0 0) content-box exclude, linear-gradient(#000 0 0);
  pointer-events:none;
  transition:--search-trace .5s var(--ease-in-out);
}
.search-field:hover{ border-color:var(--line-strong); color:var(--text-2); }
.search-field:focus-within{ color:var(--accent-text); }
.search-field:focus-within::before{ --search-trace:100%; transition-duration:.9s; }
.search-field .i{ position:relative; z-index:1; transform-origin:45% 45%; }
.search-field:focus-within .i{ animation:search-look .6s var(--ease-out); }
@keyframes search-look{
  0%{ transform:rotate(0) scale(1); }
  35%{ transform:rotate(-16deg) scale(1.12); }
  70%{ transform:rotate(6deg) scale(1); }
  100%{ transform:rotate(0) scale(1); }
}
.search-field input{
  position:relative;
  z-index:1;
  min-height:0;
  height:100%;
  padding:0;
  border:0;
  background:none;
  box-shadow:none !important;
}
@media (prefers-reduced-motion: reduce){
  .search-field::before{ transition:none; }
  .search-field:focus-within .i{ animation:none; }
}

/* ---------- Text blocks ---------- */

.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:var(--s-2);
  color:var(--text-3);
  font-family:var(--font-mono);
  font-size:var(--fs-2xs);
  font-weight:500;
  letter-spacing:var(--tracking-label);
  text-transform:uppercase;
}
.eyebrow .i{ width:14px; height:14px; }
.eyebrow-dot{
  width:7px;
  height:7px;
  border-radius:2px;
  background:var(--eyebrow-dot, var(--accent));
}

.chip{
  /* tags are quiet inline labels: an icon and words, no capsule */
  display:inline-flex;
  align-items:center;
  gap:6px;
  color:var(--text-2);
  font-size:var(--fs-sm);
  font-weight:400;
}
/* the body font's figures and capitals sit a touch above the line's middle; lifting the icon 1px levels them */
.chip .i{ width:15px; height:15px; flex:none; color:var(--text-3); transform:translateY(-1px); }

.badge{
  display:inline-flex;
  align-items:center;
  gap:6px;
  color:var(--text-2);
  font-size:var(--fs-xs);
}
.badge-accent{ color:var(--accent-text); }
.badge-bad{ color:var(--bad); }

.status-pill{
  display:inline-flex;
  align-items:center;
  gap:6px;
  font-size:var(--fs-sm);
  font-weight:400;
}
.status-pill .i{ width:15px; height:15px; stroke-width:2; }
.status-pill.is-good{ color:var(--good); }
.status-pill.is-bad{ color:var(--bad); }

.counter{
  color:var(--text-2);
  font-size:var(--fs-xs);
  letter-spacing:.04em;
}

.hint{
  display:inline-flex;
  align-items:center;
  gap:6px;
  color:var(--text-3);
  font-size:var(--fs-xs);
}
.hint .i{ width:14px; height:14px; }

/* ---------- Avatar ---------- */

.avatar{
  display:grid;
  place-items:center;
  width:34px;
  height:34px;
  flex:none;
  overflow:hidden;
  border-radius:50%;
  /* no photo yet: a plain grey circle with the first letter in the serif */
  background:color-mix(in srgb, var(--text) 18%, var(--surface));
  color:var(--text);
  font-family:var(--font-serif);
  font-size:17px;
  font-weight:400;
}
.avatar-mono{ line-height:1; transform:translateY(.04em); }
.avatar img{ width:100%; height:100%; object-fit:cover; }
.avatar-lg{ width:56px; height:56px; font-size:1.75rem; }
.avatar-xl{ width:72px; height:72px; font-size:2.3rem; }
.avatar.is-loading{ position:relative; }
.avatar.is-loading::after{
  content:"";
  position:absolute;
  inset:0;
  background:var(--scrim);
  animation:pulse 1s var(--ease-in-out) infinite;
}

/* ---------- Password input + strength ---------- */

.password-input{ position:relative; }
.password-input input{ padding-right:44px; }
.password-input .icon-btn{ position:absolute; top:50%; right:6px; transform:translateY(-50%); }
.password-input .icon-btn:active:not(:disabled){ transform:translateY(-50%) scale(.92); }

.strength{
  --tone:var(--line-strong);
  display:flex;
  align-items:center;
  gap:var(--s-3);
  color:var(--text-3);
  font-size:var(--fs-xs);
}
.strength[data-score="1"]{ --tone:var(--bad); }
.strength[data-score="2"]{ --tone:var(--warn); }
.strength[data-score="3"],
.strength[data-score="4"]{ --tone:var(--good); }
.strength-bars{ display:grid; grid-template-columns:repeat(4, 1fr); gap:4px; width:120px; }
.strength-bars i{
  height:4px;
  border-radius:var(--r-pill);
  background:var(--line);
  transition:background-color var(--dur-2) var(--ease-out);
}
.strength[data-score="1"] i:nth-child(-n+1),
.strength[data-score="2"] i:nth-child(-n+2),
.strength[data-score="3"] i:nth-child(-n+3),
.strength[data-score="4"] i{ background:var(--tone); }
.strength:not([data-score="0"]) .strength-label{ color:var(--tone); font-weight:500; }

.link-btn{
  display:inline-flex;
  align-items:center;
  gap:4px;
  color:var(--accent-text);
  font-size:var(--fs-xs);
  font-weight:500;
}
.link-btn .i{ width:14px; height:14px; }
.link-btn:hover{ text-decoration:underline; text-underline-offset:3px; }

/* ---------- Progress ---------- */

.progress{
  height:3px;
  overflow:hidden;
  border-radius:var(--r-pill);
  background:var(--line);
}
.progress > span{
  display:block;
  height:100%;
  border-radius:inherit;
  background:var(--accent);
  transition:width var(--dur-3) var(--ease-out);
}

.progress-steps{
  display:flex;
  gap:4px;
  height:4px;
  background:none;
  overflow:visible;
}
.progress-steps span{
  flex:1;
  border-radius:var(--r-pill);
  background:var(--line);
  transition:background-color var(--dur-3) var(--ease-out);
}
.progress-steps span.done{ background:var(--accent); }
.progress-steps span.current{ background:var(--accent-line); }

/* ---------- Difficulty ---------- */

.difficulty{
  --tone:var(--good);
  display:inline-flex;
  align-items:center;
  gap:var(--s-3);
  font-size:var(--fs-xs);
}
.difficulty.is-medium{ --tone:var(--warn); }
.difficulty.is-hard{ --tone:var(--bad); }
.difficulty-name{ color:var(--tone); font-weight:500; }
.difficulty-bars{ display:inline-flex; gap:3px; }
.difficulty-bars span{
  width:4px;
  height:12px;
  border-radius:1px;
  background:var(--line);
}
.difficulty-bars span.on{ background:var(--tone); }
.difficulty-score{ color:var(--text-3); font-size:11px; }
.difficulty-compact .difficulty-name{ display:none; }

/* ---------- Answer numeral ----------
   Answers are numbered i. ii. iii. in the landing page's numeral style: an italic
   serif filled with a light-to-silver gradient. States only swap the two gradient
   stops (--lt-top / --lt-bottom), so the shape never changes. */

.answer-letter{
  --lt-top:color-mix(in srgb, #F4F1EA 72%, transparent);
  --lt-bottom:color-mix(in srgb, #8E9AA3 70%, transparent);
  display:inline-flex;
  align-items:center;
  flex:none;
  min-width:1.6em;
  padding:0 .14em .08em 0;
  border-radius:6px;
  background-image:linear-gradient(180deg, var(--lt-top) 20%, var(--lt-bottom) 100%);
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
  font-family:var(--font-serif);
  font-size:1.4rem;
  font-style:italic;
  font-weight:400;
  line-height:1;
  letter-spacing:-.01em;
  white-space:nowrap;
}
.answer-letter::after{ content:"."; }
.answer-letter-sm{ min-width:1.6em; font-size:1.15rem; }
/* state colours, shared by the player, review, quiz page and editor */
.answer-letter.is-lit, .is-picked > .answer-letter{ --lt-top:color-mix(in srgb, var(--accent) 35%, #fff); --lt-bottom:var(--accent); }
.is-correct > .answer-letter, .correct > .answer-letter, .is-correct .explain-answer-head .answer-letter{ --lt-top:color-mix(in srgb, var(--good) 35%, #fff); --lt-bottom:var(--good); }
.is-wrong > .answer-letter, .is-wrong .explain-answer-head .answer-letter{ --lt-top:color-mix(in srgb, var(--bad) 35%, #fff); --lt-bottom:var(--bad); }

/* ---------- Learning notes ---------- */

.notes-stack{ display:grid; gap:var(--s-3); }

.note{
  --note-tone:var(--accent-text);
  position:relative;
  padding:var(--s-3) var(--s-4) var(--s-3) calc(var(--s-4) + 3px);
  border:1px solid var(--line);
  border-radius:var(--r-sm);
  background:var(--surface-sunken);
}
.note::before{
  content:"";
  position:absolute;
  left:-1px;
  top:var(--s-3);
  bottom:var(--s-3);
  width:3px;
  border-radius:0 3px 3px 0;
  background:var(--note-tone);
}
.note-remember{ --note-tone:var(--warn); }
.note-label{
  display:flex;
  align-items:center;
  gap:6px;
  margin-bottom:4px;
  color:var(--note-tone);
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:500;
  letter-spacing:var(--tracking-label);
  text-transform:uppercase;
}
.note-label .i{ width:14px; height:14px; }
.note-text{ color:var(--text); font-size:var(--fs-sm); line-height:var(--lh-body); white-space:pre-wrap; }

.notes-compact{ grid-template-columns:repeat(auto-fit, minmax(220px, 1fr)); gap:var(--s-2); }
.notes-compact .note{ padding-top:10px; padding-bottom:10px; }
.notes-compact .note-text{
  display:-webkit-box;
  overflow:hidden;
  -webkit-line-clamp:3;
  -webkit-box-orient:vertical;
  color:var(--text-2);
  font-size:var(--fs-xs);
}

/* ---------- Upload zone ---------- */

.upload-zone{
  position:relative;
  display:grid;
  place-items:center;
  gap:var(--s-2);
  min-height:150px;
  padding:var(--s-5);
  overflow:hidden;
  border:1px solid var(--line);
  border-radius:var(--r-sm);
  background:var(--surface-sunken);
  color:var(--text-3);
  text-align:center;
  transition:border-color var(--dur-2), background-color var(--dur-2);
}
.upload-zone input[type="file"]{ position:absolute; inset:0; opacity:0; cursor:pointer; }
.upload-zone:hover,
.upload-zone.is-drag-over{ border-color:var(--accent); background:var(--accent-wash); color:var(--text-2); }
.upload-zone-icon .i{ width:26px; height:26px; }
.upload-zone-text{ font-size:var(--fs-xs); }
.upload-zone-text strong{ color:var(--text); font-weight:500; }
.upload-zone.has-image{ padding:0; border-style:solid; }
.upload-zone.has-image img{ width:100%; max-height:240px; object-fit:contain; background:var(--paper); }
.upload-zone-overlay{
  position:absolute;
  inset:0;
  display:flex;
  align-items:center;
  justify-content:center;
  gap:var(--s-2);
  background:var(--scrim);
  color:#fff;
  font-size:var(--fs-sm);
  font-weight:500;
  opacity:0;
  transition:opacity var(--dur-2);
  pointer-events:none;
}
.upload-zone.has-image:hover .upload-zone-overlay{ opacity:1; }

/* ---------- Colour swatches ---------- */

.color-swatches{ display:flex; flex-wrap:wrap; gap:var(--s-2); }
.swatch{
  display:grid;
  place-items:center;
  width:34px;
  height:34px;
  border-radius:50%;
  background:var(--swatch);
  color:#fff;
  box-shadow:inset 0 0 0 1px rgba(255,255,255,.12);
  transition:transform var(--dur-2) var(--ease-spring), box-shadow var(--dur-2);
}
.swatch .i{ width:16px; height:16px; stroke-width:2.4; opacity:0; transform:scale(.6); transition:opacity var(--dur-1), transform var(--dur-2) var(--ease-spring); }
.swatch:hover{ transform:scale(1.08); }
.swatch.selected{ box-shadow:0 0 0 2px var(--surface), 0 0 0 4px var(--swatch); }
.swatch.selected .i{ opacity:1; transform:none; }
.swatch:focus-visible{ outline:2px solid var(--accent-line); outline-offset:4px; }

/* folder modal: a live preview of the library card beside the form */
.folder-modal{ max-width:640px; }
.folder-studio{
  display:grid;
  grid-template-columns:220px minmax(0, 1fr);
  gap:var(--s-6);
  align-items:stretch;
}
.folder-studio-preview{
  position:relative;
  display:flex;
  flex-direction:column;
  gap:var(--s-2);
  min-height:240px;
  padding:var(--s-5);
  overflow:hidden;
  isolation:isolate;
  border:1px solid color-mix(in srgb, var(--folder-color) 35%, var(--line));
  border-radius:var(--r-lg);
  background:
    radial-gradient(120% 80% at 0% 0%, color-mix(in srgb, var(--folder-color) 16%, transparent), transparent 70%),
    var(--surface-sunken);
  transition:border-color var(--dur-2), background var(--dur-2);
}
.folder-studio-mark{
  position:absolute;
  z-index:-1;
  right:-22px;
  bottom:-26px;
  color:var(--folder-color);
  opacity:.12;
}
.folder-studio-mark .i{ width:140px; height:140px; stroke-width:1.2; }
.folder-studio-icon{ display:grid; place-items:start; margin-bottom:auto; color:var(--folder-color); }
.folder-studio-icon .i{ width:34px; height:34px; stroke-width:1.6; animation:scale-in var(--dur-3) var(--ease-spring); }
.folder-studio-name{
  font-family:var(--font-display);
  font-size:var(--fs-xl);
  font-weight:600;
  line-height:1.2;
  overflow-wrap:anywhere;
}
.folder-studio-meta{ color:var(--text-3); font-size:var(--fs-xs); }
.folder-studio-bar{ height:5px; margin-top:var(--s-2); border-radius:var(--r-pill); background:var(--line-soft); overflow:hidden; }
.folder-studio-bar span{ display:block; width:38%; height:100%; border-radius:inherit; background:var(--folder-color); transition:background var(--dur-2); }
.folder-studio-form{ display:flex; flex-direction:column; gap:var(--s-5); min-width:0; }
.folder-studio-form .field + .field{ margin-top:0; }
.folder-studio .color-swatches{ flex-wrap:nowrap; gap:7px; }
.folder-studio .swatch{ width:30px; height:30px; flex:none; }

.folder-suggest{ display:flex; flex-wrap:wrap; gap:var(--s-2); margin-top:calc(var(--s-2) * -1); }
.folder-suggest-btn{
  display:inline-flex;
  align-items:center;
  gap:6px;
  height:30px;
  padding:0 var(--s-3);
  border:1px solid var(--line);
  border-radius:var(--r-pill);
  background:var(--surface);
  color:var(--text-2);
  font:inherit;
  font-size:var(--fs-xs);
  font-weight:500;
  cursor:pointer;
  transition:border-color var(--dur-1), color var(--dur-1), background var(--dur-1);
}
.folder-suggest-btn .i{ width:14px; height:14px; color:var(--text-3); }
.folder-suggest-btn:hover{ border-color:var(--line-strong); background:var(--hover); color:var(--text); }
.folder-suggest-btn:hover .i{ color:var(--accent-text); }
@media (max-width: 640px){
  .folder-studio{ grid-template-columns:1fr; }
  .folder-studio-preview{ min-height:170px; }
}

/* ---------- Toasts ---------- */

#toastHost{
  position:fixed;
  z-index:200;
  right:var(--s-6);
  bottom:var(--s-6);
  display:flex;
  flex-direction:column;
  align-items:flex-end;
  gap:var(--s-2);
  pointer-events:none;
}
.toast{
  display:flex;
  align-items:center;
  gap:var(--s-3);
  max-width:380px;
  padding:var(--s-3) var(--s-4);
  border:1px solid var(--line);
  border-radius:var(--r-sm);
  background:var(--surface);
  box-shadow:var(--shadow-md);
  color:var(--text);
  font-size:var(--fs-sm);
  font-weight:500;
  pointer-events:auto;
  animation:toast-in var(--dur-3) var(--ease-spring) both;
}
.toast .i{ width:17px; height:17px; flex:none; color:var(--good); }
.toast-error .i{ color:var(--bad); }
.toast-info .i{ color:var(--accent-text); }
.toast.is-sticky{ cursor:pointer; padding-right:var(--s-2); }
.toast-close{
  display:grid;
  place-items:center;
  flex:none;
  width:26px;
  height:26px;
  margin-left:auto;
  border:0;
  border-radius:var(--r-xs);
  background:transparent;
  color:var(--text-3);
  cursor:pointer;
  transition:background var(--dur-1) var(--ease-out), color var(--dur-1) var(--ease-out);
}
.toast-close .i{ width:14px; height:14px; color:inherit; }
.toast.is-sticky:hover .toast-close{ background:var(--surface-2); color:var(--text); }
.toast.is-leaving{ animation:toast-out var(--dur-2) var(--ease-in-out) both; }
@keyframes pulse{ 50%{ opacity:.55; } }
@keyframes toast-in{ from{ opacity:0; transform:translateY(12px) scale(.96); } to{ opacity:1; transform:none; } }
@keyframes toast-out{ to{ opacity:0; transform:translateX(16px); } }

/* ---------- Menus ---------- */

.menu-item{
  display:flex;
  align-items:center;
  gap:var(--s-3);
  width:100%;
  height:36px;
  padding:0 var(--s-3);
  border-radius:var(--r-xs);
  color:var(--text-2);
  font-size:var(--fs-sm);
  font-weight:500;
  text-align:left;
}
.menu-item .i{ width:16px; height:16px; flex:none; }
.menu-item > span:last-child{ min-width:0; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
.menu-item:hover{ background:var(--hover); color:var(--text); }
.menu-item-danger:hover{ background:var(--bad-wash); color:var(--bad); }
.menu-sep{ height:1px; margin:var(--s-1) 0; background:var(--line-soft); }

/* ---------- Maths (KaTeX) ---------- */

.katex{ font-size:1.06em; color:inherit; }
.katex-display{
  margin:var(--s-2) 0;
  padding:var(--s-1) 0;
  overflow-x:auto;
  overflow-y:hidden;
  scrollbar-width:thin;
}
.note-text .katex-display,
.question-text .katex-display{ text-align:left; }
.note-text .katex-display > .katex,
.question-text .katex-display > .katex{ text-align:left; }

.note-solution{ --note-tone:var(--accent-text); }
.note-solution .note-text{ font-variant-numeric:tabular-nums; }

.math-preview{
  display:grid;
  gap:4px;
  padding:var(--s-2) var(--s-3);
  border:1px solid var(--line);
  border-radius:var(--r-sm);
  background:var(--surface-sunken);
  font-size:var(--fs-sm);
  line-height:1.6;
  white-space:pre-wrap;
  overflow-wrap:anywhere;
  animation:fade-in var(--dur-2);
}
.math-preview-label{ color:var(--text-3); font-size:10px; letter-spacing:var(--tracking-label); text-transform:uppercase; }

.editor-image-actions{ display:flex; gap:var(--s-2); }
.editor-image-actions .btn{ flex:1; }
.editor-solution-input{ font-family:var(--font-mono); font-size:var(--fs-xs) !important; }

.solution-details{
  border:1px solid var(--line);
  border-radius:var(--r-sm);
  background:var(--surface-sunken);
}
.solution-details summary{
  display:flex;
  align-items:center;
  gap:var(--s-2);
  padding:10px var(--s-4);
  color:var(--accent-text);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:var(--tracking-label);
  text-transform:uppercase;
  cursor:pointer;
  list-style:none;
}
.solution-details summary::-webkit-details-marker{ display:none; }
.solution-details summary .i{ width:14px; height:14px; }
.solution-details summary .i:last-child{ margin-left:auto; color:var(--text-3); transition:transform var(--dur-2) var(--ease-out); }
.solution-details[open] summary .i:last-child{ transform:rotate(180deg); }
.solution-details .note-text{ padding:0 var(--s-4) var(--s-3); color:var(--text-2); }

/* ---------- Floating tooltip ---------- */

.floating-tip{
  position:fixed;
  z-index:600;
  max-width:260px;
  padding:5px 9px;
  border:1px solid var(--line);
  border-radius:var(--r-xs);
  background:var(--surface);
  box-shadow:var(--shadow-md);
  color:var(--text);
  font-size:var(--fs-xs);
  font-weight:500;
  white-space:nowrap;
  transform:translate(-50%, calc(-100% - 8px));
  opacity:0;
  pointer-events:none;
  transition:opacity var(--dur-1);
}
.floating-tip.is-right{ transform:translate(0, -50%); }
.floating-tip.visible{ opacity:1; }