/* ============ app layout ============ */
.skip { position: absolute; inset-inline-start: -999px; top: 8px; background: var(--panel); padding: 6px 12px; border-radius: 8px; z-index: 100; }
.skip:focus { inset-inline-start: 8px; }

.btn {
  display: inline-flex; align-items: center; gap: 7px; border: 1px solid var(--line2); background: var(--panel);
  border-radius: 10px; padding: 7px 13px; font-size: 14.5px; cursor: pointer; line-height: 1.2; white-space: nowrap;
}
.btn:hover { border-color: var(--accent); }
.btn.sm { padding: 4px 10px; font-size: 13px; border-radius: 8px; }
.btn.ghost { background: transparent; border-color: transparent; }
.btn.ghost:hover { background: var(--bg2); }
.btn.icon { padding: 7px; }
.btn.link { border: 0; background: none; padding: 2px 4px; color: var(--accent); text-decoration: underline; text-underline-offset: 3px; font-size: 14px; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--on-accent); }
.btn svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.btn svg circle { fill: currentColor; stroke: none; }
:focus-visible { outline: 2.5px solid var(--accent); outline-offset: 2px; border-radius: 6px; }

.top {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding-block: 14px; padding-left: max(24px, env(safe-area-inset-left, 0px)); padding-right: max(24px, env(safe-area-inset-right, 0px));
  background: var(--panel); border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 14px; min-width: 0; }
.logo { width: 44px; height: 44px; flex: none; }
.logo path { fill: var(--accent-soft); stroke: var(--accent); stroke-width: 1.6; stroke-linejoin: round; }
.logo circle { fill: none; stroke: var(--g-concl); stroke-width: 1.5; }
.brand h1 { margin: 0; font: 400 24px/1.2 var(--display); letter-spacing: .005em; text-wrap: balance; }
.brand p { margin: 2px 0 0; color: var(--ink2); font-size: 14.5px; }
.top-actions { display: flex; gap: 4px; flex: none; }

.layout {
  display: grid; grid-template-columns: 318px minmax(0, 1fr); gap: 24px;
  max-width: 1380px; margin: 0 auto; padding-block: 18px 24px;
  padding-left: max(24px, env(safe-area-inset-left, 0px)); padding-right: max(24px, env(safe-area-inset-right, 0px));
}

/* ---- side panel ---- */
.side {
  position: sticky; top: 12px; align-self: start; max-height: calc(100vh - 24px); overflow: auto;
  background: var(--panel); border: 1px solid var(--line); border-radius: 16px; padding: 14px 16px 18px;
  box-shadow: var(--shadow); overscroll-behavior: contain;
}
.side-h { display: flex; align-items: center; gap: 8px; }
.side-h h2 { margin: 0; font-size: 17px; flex: 1; }
.sheet-x, .sheet-foot { display: none; }
.fgrp { margin-top: 14px; }
.fgrp h3 { margin: 0 0 7px; font-size: 13px; font-weight: 600; color: var(--ink3); letter-spacing: .01em; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.side .chip { font-size: 14px; padding: 4px 10px; }
.tgl { display: flex; align-items: center; gap: 8px; font-size: 14.5px; padding: 3px 0; cursor: pointer; }
.tgl input { width: 17px; height: 17px; accent-color: var(--accent); }

.seg { display: inline-flex; flex-wrap: wrap; background: var(--bg2); border-radius: 11px; padding: 3px; gap: 2px; }
.seg button { border: 0; background: transparent; padding: 5px 11px; border-radius: 8px; font-size: 14px; cursor: pointer; color: var(--ink2); }
.seg button .cnt { font-size: 11.5px; color: var(--ink3); font-variant-numeric: tabular-nums; }
.seg button.on { background: var(--panel); color: var(--ink); font-weight: 600; box-shadow: 0 1px 3px rgba(0, 0, 0, .12); }
.seg button.zero { color: var(--ink3); }
.side .seg { display: grid; grid-template-columns: repeat(4, 1fr); width: 100%; }
.side .seg button { padding: 5px 2px; font-size: 13.5px; display: flex; flex-direction: column; align-items: center; line-height: 1.25; }

/* ---- active bar ---- */
.activebar {
  position: sticky; top: env(safe-area-inset-top, 0px); z-index: 6; display: flex; justify-content: space-between; align-items: center; gap: 10px; flex-wrap: wrap;
  padding: 10px 2px; margin-bottom: 4px;
  background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
}
.ab-l { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; }
.ab-all { font-weight: 600; font-size: 16px; }
.ab-r { display: flex; align-items: center; gap: 10px; }
.ab-n { font-size: 14px; color: var(--ink2); font-variant-numeric: tabular-nums; }
.plus { color: var(--ink3); font-weight: 700; }
.chip.rm .x { font-size: 11px; opacity: .85; }

/* ---- hero ---- */
.hero { background: var(--panel); border: 1px solid var(--line); border-radius: 18px; padding: 20px 22px; margin-bottom: 18px; box-shadow: var(--shadow); }
.hero h2 { margin: 0 0 12px; font: 400 21px/1.3 var(--display); text-wrap: balance; }
.tiles { display: grid; grid-template-columns: repeat(auto-fill, minmax(112px, 1fr)); gap: 10px; }
.tile {
  display: flex; flex-direction: column; align-items: center; gap: 4px; padding: 14px 8px 10px;
  border: 1px solid var(--line2); border-radius: 14px; background: var(--bg); cursor: pointer; font-size: 15px; font-weight: 500;
  transition: transform .1s, border-color .12s, background .12s;
}
.tile:hover { border-color: var(--accent); background: var(--accent-soft); transform: translateY(-2px); }
.tile svg { width: 42px; height: 42px; }
.tile svg path, .tile svg circle { fill: color-mix(in srgb, var(--accent) 14%, transparent); stroke: var(--accent); stroke-width: 1.4; stroke-linejoin: round; }
.tile .cnt { font-size: 12px; color: var(--ink3); }
.hero-c { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; margin-top: 14px; }
.hero-c > span { font-size: 14px; color: var(--ink2); margin-inline-end: 4px; }
.hero-tip { margin: 14px 0 0; font-size: 14px; color: var(--ink2); }
.concept.demo { cursor: default; }

/* ---- spotlight ---- */
.spot { background: var(--panel); border: 1px solid var(--line); border-radius: 18px; padding: 16px 20px; margin-bottom: 14px; box-shadow: var(--shadow); }
.spot-h { display: flex; gap: 14px; align-items: flex-start; }
.spot-ic svg { width: 46px; height: 46px; }
.spot-ic svg path, .spot-ic svg circle { fill: color-mix(in srgb, var(--accent) 14%, transparent); stroke: var(--accent); stroke-width: 1.4; stroke-linejoin: round; }
.spot-t { min-width: 0; }
.spot h2 { margin: 0; font: 400 23px/1.3 var(--display); text-wrap: balance; }
.spot-def { margin: 4px 0 0; color: var(--ink2); }
.spot-fam { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; margin-top: 10px; font-size: 14px; color: var(--ink2); }
.fam-tip { flex-basis: 100%; font-size: 13.5px; color: var(--ink3); }
.spot-row { display: flex; gap: 10px; align-items: flex-start; margin-top: 12px; flex-wrap: wrap; }
.spot-l { font-size: 13.5px; font-weight: 600; color: var(--ink3); padding-top: 6px; white-space: nowrap; }
.spot-row .chips { flex: 1; min-width: 0; }
details.more { display: inline-block; }
details.more summary { list-style: none; cursor: pointer; font-size: 13px; color: var(--accent); padding: 3px 8px; border-radius: 999px; border: 1px dashed var(--line2); }
details.more summary::-webkit-details-marker { display: none; }
details.more[open] summary { margin-bottom: 6px; }

/* ---- results ---- */
.results { display: block; outline: none; }
.sec-h { display: flex; align-items: center; gap: 10px; margin: 22px 2px 10px; font-size: 15px; font-weight: 600; color: var(--ink2); }
.sec-h::after { content: ''; flex: 1; height: 1px; background: var(--line2); }
.sec-h .cnt { font-size: 12.5px; color: var(--ink3); background: var(--bg2); border-radius: 999px; padding: 0 8px; }
.sec { display: grid; grid-template-columns: minmax(0, 1fr); gap: 14px; }
.sec > .card { content-visibility: auto; contain-intrinsic-size: auto 340px; }
.empty { text-align: center; padding: 40px 10px; color: var(--ink2); }
.card.flash { animation: flash 1.4s ease-out; }
@keyframes flash { 0% { box-shadow: 0 0 0 4px var(--accent); } 100% { box-shadow: var(--shadow); } }

/* ---- explorer ---- */
.explorer {
  margin: -4px 0 4px; border: 2px solid color-mix(in srgb, var(--concept) 55%, transparent); border-radius: 16px;
  background: color-mix(in srgb, var(--concept-bg) 70%, var(--bg)); padding: 12px 14px 14px; position: relative;
  animation: exIn .18s ease-out; scroll-margin-top: 70px;
}
@keyframes exIn { from { opacity: 0; transform: translateY(-6px); } to { opacity: 1; transform: none; } }
.explorer::before {
  content: ''; position: absolute; top: -9px; left: var(--notch-x, 40px); width: 14px; height: 14px; transform: rotate(45deg);
  background: color-mix(in srgb, var(--concept-bg) 70%, var(--bg)); border-top: 2px solid color-mix(in srgb, var(--concept) 55%, transparent); border-left: 2px solid color-mix(in srgb, var(--concept) 55%, transparent);
}
.ex-h { display: flex; justify-content: space-between; align-items: center; gap: 10px; flex-wrap: wrap; }
.crumbs { display: flex; align-items: center; flex-wrap: wrap; gap: 4px; font-size: 16px; }
.crumb { border: 0; background: none; padding: 2px 4px; color: var(--concept); cursor: pointer; text-decoration: underline; text-underline-offset: 3px; font-size: 15px; }
.crumb.cur { display: inline-flex; align-items: center; gap: 6px; font-weight: 700; text-decoration: none; color: var(--ink); font-size: 18px; cursor: default; }
.crumb.cur svg { width: 22px; height: 22px; }
.crumb.cur svg path, .crumb.cur svg circle { fill: none; stroke: var(--concept); stroke-width: 1.6; }
.crumb-sep { color: var(--ink3); }
.ex-act { display: flex; align-items: center; gap: 6px; }
.ex-n { font-size: 13.5px; color: var(--ink2); margin-inline-end: 4px; }
.ex-ctrl { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }
.ex-refine { display: flex; gap: 8px; align-items: flex-start; margin-top: 10px; }
.ex-list { display: grid; grid-template-columns: minmax(0, 1fr); gap: 8px; margin-top: 12px; }
.ex-open { display: grid; gap: 6px; }
.ex-open .collapse { justify-self: end; color: var(--ink2); }
.ex-open .collapse .chev-up { margin-inline-start: 2px; }

/* ---- card header buttons: save to folder, collapse ---- */
.card-h.has-act { padding-inline-end: 44px; }
.ex-open .card-h.has-act { padding-inline-end: 132px; }
.card-act { position: absolute; top: 10px; inset-inline-end: 10px; display: flex; gap: 6px; align-items: center; }
.modal-box .card-act { inset-inline-end: 58px; }
.save {
  display: inline-grid; place-items: center; width: 36px; height: 36px; border-radius: 10px; border: 1px solid transparent;
  background: transparent; color: var(--ink2); cursor: pointer; transition: background .12s, color .12s, transform .08s;
}
.save:hover { background: var(--bg2); color: var(--accent); }
.save:active { transform: scale(.92); }
.save svg, .save-demo svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linejoin: round; }
.save[aria-pressed="true"] { color: var(--accent); background: var(--accent-soft); border-color: color-mix(in srgb, var(--accent) 35%, transparent); }
.save[aria-pressed="true"] svg { fill: currentColor; }
.save-demo { display: inline-flex; vertical-align: -4px; color: var(--accent); }
.save-demo svg { width: 18px; height: 18px; }
.fold, .collapse {
  display: inline-flex; align-items: center; gap: 7px; height: 36px; padding: 0 12px; border-radius: 10px;
  border: 1px solid var(--line2); background: var(--panel); color: var(--ink2); font-size: 14px; cursor: pointer;
}
.fold:hover, .collapse:hover { border-color: var(--accent); color: var(--accent); }
.chev-up { width: 8px; height: 8px; border-top: 2px solid currentColor; border-inline-start: 2px solid currentColor; transform: rotate(45deg); margin-top: 4px; flex: none; }

/* ---- "my folders" button ---- */
.folders-btn b:not(:empty) {
  display: inline-grid; place-items: center; min-width: 21px; height: 21px; padding: 0 6px; border-radius: 999px;
  background: var(--accent); color: var(--on-accent); font-size: 12.5px; font-weight: 700; font-variant-numeric: tabular-nums;
}
.folders-btn[aria-current="page"] { background: var(--accent-soft); color: var(--accent-ink); }
.folders-btn.bump svg { animation: bump .5s ease-out; }
@keyframes bump { 0% { transform: none; } 35% { transform: scale(1.3) rotate(-8deg); } 100% { transform: none; } }

/* ---- folder view ---- */
body.fv-mode .layout { grid-template-columns: minmax(0, 1fr); max-width: 1000px; }
body.fv-mode .side, body.fv-mode .fab, body.fv-mode .activebar { display: none; }
.fv-top { margin: 2px 0 10px; }
.fv-top .btn { padding-inline-start: 6px; }
.fv-tabs { display: flex; gap: 10px; align-items: flex-start; margin: 0 0 16px; flex-wrap: wrap; }
.fv-tabs .chips { flex: 1; min-width: 0; }
.fv-tabs .chip { max-width: 100%; }
.fv-tabs .chip span:not(.cnt) { overflow: hidden; text-overflow: ellipsis; }
.chip.add { border-style: dashed; color: var(--accent-ink); }
.fv-kicker { margin: 0 0 4px; font-size: 14px; font-weight: 600; color: var(--concept); }
.fv-head { display: flex; align-items: center; justify-content: space-between; gap: 10px 16px; flex-wrap: wrap; }
.fv-head h2 { display: flex; align-items: center; gap: 10px; margin: 0; font: 400 26px/1.25 var(--display); min-width: 0; overflow-wrap: anywhere; outline-offset: 4px; }
.fv-head h2 svg { width: 30px; height: 30px; flex: none; fill: var(--accent-soft); stroke: var(--accent); stroke-width: 1.5; stroke-linejoin: round; }
.fv-actions { display: flex; gap: 6px; flex-wrap: wrap; }
.btn svg path { fill: none; }
.btn.primary svg path { stroke: currentColor; }
.btn.danger:hover { border-color: #b42318; color: #b42318; }
.btn.danger.solid { background: #b42318; border-color: #b42318; color: #fff; }
.btn.danger.solid:hover { background: #912018; color: #fff; }
:root[data-theme="dark"] .btn.danger:hover { color: #ff8a7a; border-color: #ff8a7a; }
:root[data-theme="dark"] .btn.danger.solid { background: #ff8a7a; border-color: #ff8a7a; color: #2a0b07; }
:root[data-theme="dark"] .tile:hover .cnt { color: var(--ink2); }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .btn.danger:hover { color: #ff8a7a; border-color: #ff8a7a; }
  :root:not([data-theme="light"]) .btn.danger.solid { background: #ff8a7a; border-color: #ff8a7a; color: #2a0b07; }
  :root:not([data-theme="light"]) .tile:hover .cnt { color: var(--ink2); }
}
.fv-confirm { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 10px; margin: 12px 0 0; padding: 10px 14px; border-radius: 12px;
  border: 1.5px solid #e8b4ad; background: #fff4f2; }
.fv-confirm p { margin: 0; flex: 1 1 260px; font-weight: 500; color: #3d0f0a; }
:root[data-theme="dark"] .fv-confirm { background: #33171a; border-color: #6e2f29; }
:root[data-theme="dark"] .fv-confirm p { color: #ffd9d4; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .fv-confirm { background: #33171a; border-color: #6e2f29; }
  :root:not([data-theme="light"]) .fv-confirm p { color: #ffd9d4; }
}
.btn[disabled] { opacity: .45; cursor: not-allowed; }
.btn[disabled]:hover { border-color: var(--line2); }
.btn.ghost[disabled]:hover { border-color: transparent; background: transparent; }
.fv-sub { margin: 6px 0 18px; color: var(--ink2); font-size: 14.5px; }
.fv-list { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: minmax(0, 1fr); gap: 18px; }
.fv-item { display: grid; gap: 6px; }
.fv-tools { display: flex; align-items: center; gap: 2px; }
.fv-n { display: inline-grid; place-items: center; min-width: 26px; height: 26px; border-radius: 999px; background: var(--bg2); font-size: 13px; font-weight: 700; color: var(--ink2); margin-inline-end: 4px; }
.fv-tools .btn.sm { font-size: 13.5px; color: var(--ink2); }
.fv-tools .btn svg { width: 18px; height: 18px; }
.fv-empty { background: var(--panel); border: 1px dashed var(--line2); border-radius: 18px; padding: 26px 22px; text-align: center; }
.fv-empty h2 { margin: 0 0 8px; font: 400 24px/1.3 var(--display); }
.fv-empty p { margin: 0 auto 10px; max-width: 56ch; color: var(--ink2); }
.fv-empty .btn { margin-top: 6px; }
.fv-rename { display: flex; gap: 6px; align-items: center; flex-wrap: wrap; flex: 1 1 320px; }
.fv-rename input {
  font: inherit; font-size: 18px; padding: 6px 12px; border-radius: 10px; border: 1.5px solid var(--accent);
  background: var(--panel); color: var(--ink); min-width: 0; flex: 1 1 220px; max-width: 440px;
}
.fv-hint { flex-basis: 100%; margin: 2px 0 0; font-size: 13.5px; color: var(--ink2); }
.sr { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }

/* ---- toast ---- */
.toast {
  position: fixed; bottom: calc(22px + env(safe-area-inset-bottom, 0px)); inset-inline-start: 50%; transform: translate(50%, 30px);
  z-index: 70; display: flex; align-items: center; flex-wrap: wrap; gap: 4px 14px; max-width: min(620px, calc(100vw - 32px));
  padding: 11px 18px; border-radius: 14px; background: #1d2333; color: #f3f5fa; box-shadow: 0 12px 34px rgba(0, 0, 0, .28);
  font-size: 15px; opacity: 0; visibility: hidden; pointer-events: none; transition: opacity .18s, transform .18s, visibility 0s .18s;
}
.toast.on { opacity: 1; visibility: visible; pointer-events: auto; transform: translate(50%, 0); transition: opacity .18s, transform .18s; }
.toast .btn.link { color: #b9b5ff; font-weight: 600; font-size: 15px; }
.toast :focus-visible { outline-color: currentColor; }
.toast .t-x { text-decoration: none; padding: 2px 6px; margin-inline-start: auto; }
:root[data-theme="dark"] .toast { background: #eef0f6; color: #141826; }
:root[data-theme="dark"] .toast .btn.link { color: #3730a3; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .toast { background: #eef0f6; color: #141826; }
  :root:not([data-theme="light"]) .toast .btn.link { color: #3730a3; }
}
.foot-note { color: var(--ink2); }

.card.compact { padding: 0; box-shadow: none; }
.card.compact .row {
  display: flex; align-items: center; gap: 12px; width: 100%; text-align: start; border: 0; background: none;
  padding: 10px 14px; cursor: pointer; border-radius: var(--radius);
}
.card.compact .row:hover { background: var(--bg2); }
.row-main { display: grid; gap: 1px; flex: 1; min-width: 0; }
.row-t { font-weight: 600; font-size: 15.5px; }
.row-s { font-size: 14px; color: var(--ink2); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.concept-plain { color: var(--concept); font-weight: 500; }
.chev { width: 9px; height: 9px; border-bottom: 2px solid var(--ink3); border-inline-start: 2px solid var(--ink3); transform: rotate(-45deg); flex: none; margin-top: -4px; }

/* ---- modal ---- */
.modal { position: fixed; inset: 0; z-index: 60; display: grid; place-items: center; padding: 20px; }
.modal[hidden] { display: none; }
.modal-back { position: absolute; inset: 0; background: rgba(15, 18, 30, .45); backdrop-filter: blur(2px); }
.modal-box { position: relative; width: min(940px, 100%); max-height: calc(100vh - 40px); overflow: auto; border-radius: 18px; animation: exIn .16s ease-out; }
.modal-box .card { box-shadow: 0 20px 60px rgba(0, 0, 0, .3); padding-top: 18px; }
.modal-x { position: absolute; top: 10px; inset-inline-end: 10px; z-index: 2; background: var(--panel); }
body.modal-open { overflow: hidden; }

/* ---- footer ---- */
.foot { max-width: 1380px; margin: 0 auto; padding-block: 0 110px; padding-left: max(24px, env(safe-area-inset-left, 0px)); padding-right: max(24px, env(safe-area-inset-right, 0px)); color: var(--ink3); font-size: 13.5px; }
.foot p { max-width: 75ch; margin: 0 0 6px; }

/* ---- mobile ---- */
.fab { display: none; }
@media (max-width: 960px) {
  .foot { padding-left: max(16px, env(safe-area-inset-left, 0px)); padding-right: max(16px, env(safe-area-inset-right, 0px)); }
  .layout { grid-template-columns: minmax(0, 1fr); padding-block: 12px 24px; padding-left: max(16px, env(safe-area-inset-left, 0px)); padding-right: max(16px, env(safe-area-inset-right, 0px)); }
  .top { padding-block: 12px; padding-left: max(16px, env(safe-area-inset-left, 0px)); padding-right: max(16px, env(safe-area-inset-right, 0px)); }
  .brand h1 { font-size: 19px; }
  .brand p { display: none; }
  .logo { width: 36px; height: 36px; }
  .top-actions .btn span { display: none; }
  .side {
    position: fixed; inset: auto 0 0 0; top: auto; max-height: 86vh; z-index: 50; border-radius: 20px 20px 0 0;
    transform: translateY(105%); transition: transform .22s ease, visibility 0s .22s; padding-bottom: 0; box-shadow: 0 -10px 40px rgba(0, 0, 0, .25);
    visibility: hidden; /* closed: out of the Tab order and away from screen readers */
  }
  body.sheet-open .side { transform: none; visibility: visible; transition: transform .22s ease; }
  body.sheet-open { overflow: hidden; }
  body.sheet-open::after { content: ''; position: fixed; inset: 0; background: rgba(15, 18, 30, .4); z-index: 40; }
  .sheet-x { display: inline-flex; }
  .sheet-foot { display: block; position: sticky; bottom: 0; padding: 12px 0 calc(14px + env(safe-area-inset-bottom, 0px)); background: var(--panel); margin-top: 12px; }
  .sheet-foot .btn { width: 100%; justify-content: center; padding: 11px; }
  .fab {
    display: inline-flex; align-items: center; gap: 8px; position: fixed; bottom: calc(16px + env(safe-area-inset-bottom, 0px)); inset-inline-start: 50%; transform: translateX(50%);
    z-index: 30; background: var(--accent); color: var(--on-accent); border: 0; border-radius: 999px; padding: 12px 20px; font-size: 15.5px; font-weight: 600;
    box-shadow: 0 8px 24px rgba(79, 70, 229, .4); cursor: pointer;
  }
  .fab svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; }
  .fab b:not(:empty) { background: var(--on-accent); color: var(--accent); border-radius: 999px; min-width: 22px; height: 22px; display: inline-grid; place-items: center; font-size: 13px; }
  .hero { padding: 16px; }
  .tiles { grid-template-columns: repeat(auto-fill, minmax(92px, 1fr)); gap: 8px; }
  .tile svg { width: 34px; height: 34px; }
  .spot { padding: 14px; }
  .explorer { padding: 10px; }
  .ex-refine { flex-direction: column; gap: 4px; }
  .modal { padding: 0; align-items: end; }
  .modal-box { max-height: 92vh; border-radius: 18px 18px 0 0; }
}
@media (max-width: 960px) {
  .toast { bottom: calc(80px + env(safe-area-inset-bottom, 0px)); }
  body.fv-mode .toast { bottom: calc(18px + env(safe-area-inset-bottom, 0px)); }
  .fv-head h2 { font-size: 22px; }
}
@media (max-width: 480px) {
  .seg button { padding: 5px 8px; font-size: 13.5px; }
  .card.compact .row { padding: 9px 10px; gap: 8px; }
  .ex-open .card-h.has-act { padding-inline-end: 92px; }
  /* icon-only on small screens; the text stays for screen readers */
  .fold span, .fv-actions .btn span { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
  .fv-actions .btn { padding: 7px 9px; }
}

/* ---- print: the cards only, in light colours (a folder prints as a study sheet) ---- */
@media print {
  :root, :root:not([data-theme="light"]), :root[data-theme="dark"] {
    --bg: #fff; --bg2: #f1f3f6; --panel: #fff; --ink: #000; --ink2: #333; --ink3: #555; --line: #c9ced8; --line2: #b8bfcc; --grid: #eceff4;
    --accent: #3730a3; --accent-soft: #ecebfd; --accent-ink: #3730a3; --concept: #5b21b6; --concept-bg: transparent;
    --k-def: #0f766e; --k-def-bg: #dff5f1; --k-thm: #4338ca; --k-thm-bg: #e7e6fd; --k-formula: #b45309; --k-formula-bg: #fdf0dc; --k-axiom: #475569; --k-axiom-bg: #e8ecf1;
    --g-base: #1f2937; --g-given: #2563eb; --g-concl: #e8590c; --g-hl: #7c3aed; --g-aux: #8f99ab; --g-faint: #c4cad4;
    --g-c1: #0d9488; --g-c2: #db2777; --g-c3: #ca8a04; --g-c4: #16a34a; --fig-bg: #fff; --shadow: none;
    color-scheme: light;
  }
  body { background: #fff; }
  body::before, .skip, .top, .side, .activebar, .fab, #hero, #spot, .fv-top, .fv-tabs, .fv-actions, .fv-tools, .card-act,
  .collapse, .toast, .modal, .site-strip, .site-foot, .explorer, .fv-sub { display: none !important; }
  .layout { display: block; padding: 0; max-width: none; }
  .foot { padding: 12px 0 0; }
  .card { box-shadow: none; break-inside: avoid; border-color: #b8bfcc; }
  .sec > .card { content-visibility: visible; }
  .fv-head h2 { font-size: 22px; }
  .fv-list { gap: 10px; }
  a.concept { box-shadow: none; padding: 0; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}

body::before { content: ""; position: fixed; inset: 0 0 auto; height: env(safe-area-inset-top, 0px); z-index: 10; background: var(--bg); }