/* /video-to-flipbook/ page styles. Built from /assets/polyatic.css tokens only (no new colours or fonts). */
.nojs{margin:1.25rem 0 0;padding:0.875rem 1rem;border:1px solid var(--line);border-left:0.25rem solid var(--accent);border-radius:0.625rem;background:var(--surface);color:var(--ink);font-size:0.9375rem;line-height:1.6}

@media(min-width:920px){.fb-duo{grid-template-columns:minmax(0,1.25fr) minmax(21rem,1fr)}}
.fb-left,.fb-side{display:grid;gap:1rem;align-content:start}

/* drop zone (same component as the other polyatic file tools) */
.drop{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:0.5rem;text-align:center;min-height:9rem;padding:1.25rem;border:2px dashed var(--line-2);border-radius:0.875rem;background:var(--surface-2);cursor:pointer;transition:border-color .15s,background .15s}
.drop:hover,.drop:focus-visible,.drop.drag{border-color:var(--accent);background:var(--accent-soft)}
.drop b{font-size:1.0625rem}
.drop small{color:var(--muted);max-width:38ch}
/* icon: a little stack of cards, the top one lime, fanned like a flipped book */
.fb-drop-icon{position:relative;width:3rem;height:2.25rem;border:2px solid var(--ink);border-radius:0.25rem;background:var(--surface);transform:rotate(-6deg)}
.fb-drop-icon::before,.fb-drop-icon::after{content:"";position:absolute;inset:-2px;border:2px solid var(--ink);border-radius:0.25rem;background:var(--surface)}
.fb-drop-icon::before{transform:translate(0.375rem,-0.25rem) rotate(7deg)}
.fb-drop-icon::after{transform:translate(0.75rem,-0.5rem) rotate(14deg);background:var(--signal);box-shadow:inset 0.5rem 0 0 var(--line-2)}
.has-file .drop{min-height:0;padding:0.625rem 1rem;flex-direction:row;gap:1rem;margin-bottom:0.75rem}
.has-file .drop small{display:none}
.has-file .fb-drop-icon{transform:rotate(-6deg) scale(.7)}

.hint{font-size:0.8125rem;color:var(--muted);margin:0.75rem 0.125rem 0;min-height:1.125rem;line-height:1.5;overflow-wrap:anywhere}
.hint.bad{color:var(--bad);font-weight:600}
.has-file .hint{margin:0 0.125rem 0.75rem}

.fb-work[hidden],.fb-prog[hidden],.fb-cover[hidden],.fb-pv-empty[hidden]{display:none}
.fb-src{display:flex;gap:0.75rem;align-items:center}
.fb-src video{flex:none;width:6rem;height:auto;max-height:5rem;border-radius:0.25rem;background:var(--surface-2);border:1px solid var(--line)}
.fb-src .fb-dim{margin:0}
.fb-dim{font-family:var(--mono);font-size:0.75rem;color:var(--muted);margin:0.375rem 0.125rem 0;overflow-wrap:anywhere}
.fb-note{font-size:0.8125rem;color:var(--muted);margin:0.5rem 0.125rem 0;line-height:1.5}
.fb-note.bad{color:var(--warn);font-weight:600}
.sec{font-size:0.8125rem;font-weight:700;text-transform:uppercase;letter-spacing:.5px;color:var(--muted);margin:0 0 0.625rem}
.fb-h{margin-top:1rem}

/* the frame strip with two handles */
.fb-strip{position:relative;height:4.5rem;border-radius:0.5rem;overflow:hidden;border:1px solid var(--line);background:var(--surface-2)}
.fb-strip canvas{display:block;width:100%;height:100%}
.fb-sel{position:absolute;inset:0;pointer-events:none;background:linear-gradient(90deg,rgba(0,0,0,.6) var(--a,0%),transparent var(--a,0%),transparent var(--b,100%),rgba(0,0,0,.6) var(--b,100%))}
.fb-sel::after{content:"";position:absolute;top:0;bottom:0;left:var(--a,0%);width:calc(var(--b,100%) - var(--a,0%));border-top:3px solid var(--signal);border-bottom:3px solid var(--signal);box-sizing:border-box}
.fb-strip input.fb-range[type=range]{position:absolute;inset:0;width:100%;height:100%;margin:0;padding:0;border-radius:0;background:transparent;-webkit-appearance:none;appearance:none;pointer-events:none}
.fb-strip input.fb-range[type=range]::-webkit-slider-runnable-track{background:transparent;height:100%;border:0}
.fb-strip input.fb-range[type=range]::-moz-range-track{background:transparent;height:100%;border:0}
.fb-strip input.fb-range[type=range]::-webkit-slider-thumb{-webkit-appearance:none;appearance:none;pointer-events:auto;width:1.125rem;height:4.5rem;margin:0;border-radius:0.25rem;background:var(--signal);border:2px solid var(--signal-ink);box-shadow:0 1px 3px rgba(0,0,0,.3);cursor:ew-resize}
.fb-strip input.fb-range[type=range]::-moz-range-thumb{pointer-events:auto;width:0.875rem;height:4.25rem;border-radius:0.25rem;background:var(--signal);border:2px solid var(--signal-ink);cursor:ew-resize}
.fb-strip input.fb-range[type=range]:focus-visible{outline:none}
.fb-strip input.fb-range[type=range]:focus-visible::-webkit-slider-thumb{outline:3px solid var(--accent);outline-offset:1px}
.fb-strip input.fb-range[type=range]:focus-visible::-moz-range-thumb{outline:3px solid var(--accent);outline-offset:1px}
.fb-pair{display:grid;grid-template-columns:1fr 1fr;gap:0.75rem;margin-top:0.75rem}
.fb-pair input{width:100%;box-sizing:border-box;font-family:var(--mono)}
.fb-modes{margin-bottom:0}
.fb-count{margin:0.75rem 0.125rem 0;font-size:0.9375rem}
.fb-count b{font-family:var(--mono);font-variant-numeric:tabular-nums;color:var(--ink)}

/* the flip preview: the printed card, strip and all */
.fb-pv{position:relative;border:1px solid var(--line);border-radius:0.5rem;background:var(--surface-2);padding:0.5rem}
.fb-pv canvas{display:block;width:100%;height:auto;border-radius:0.25rem;background:#fff;box-shadow:var(--shadow)}
.fb-pv-empty{position:absolute;inset:0.5rem;display:flex;align-items:center;justify-content:center;margin:0;padding:1rem;text-align:center;font-size:0.875rem;color:var(--muted);background:var(--surface-2)}
.fb-row{display:flex;flex-wrap:wrap;align-items:center;gap:0.5rem 0.75rem;margin-top:0.625rem}
.fb-row .fb-dim{margin:0}
.fb-prog{margin-top:0.75rem}
.fb-prog progress{width:100%;height:0.5rem;accent-color:var(--accent)}

.fb-panel label.field{display:block}
.fb-gap{margin-top:0.875rem}
.fb-panel input[type=range]{width:100%;accent-color:var(--accent)}
.fb-check{display:flex;flex-wrap:wrap;align-items:baseline;gap:0.25rem 0.5rem;margin-top:0.875rem;font-size:0.9375rem;cursor:pointer}
.fb-check input{accent-color:var(--accent);width:1.0625rem;height:1.0625rem;margin:0;align-self:center}
.fb-check .fb-dim{margin:0;flex-basis:100%}
.fb-cover{margin-top:0.75rem}
.fb-cover input{width:100%;box-sizing:border-box}
.fb-saverow{display:grid;grid-template-columns:1fr auto;gap:0.75rem;margin-top:1rem}
.fb-saverow .btn:disabled{opacity:.5;cursor:default;filter:none}
.chip:disabled{opacity:.45;cursor:default}
.chip:focus-visible,.modes button:focus-visible,.drop:focus-visible,.fb-check input:focus-visible{outline:2px solid var(--accent);outline-offset:2px}

.explainer .fb-steps,.explainer .fb-cannot{color:var(--muted);font-size:0.9375rem;margin:0 0 0.75rem;padding-left:1.25rem}
.explainer .fb-steps li,.explainer .fb-cannot li{margin:0 0 0.5rem}
.explainer .fb-steps b,.explainer .fb-cannot b{color:var(--ink)}

@media (prefers-reduced-motion:reduce){.drop{transition:none}}