/* Demo page. Builds on ../styles.css tokens. */
.demo { --accent-nib: #c2ad8a; }
.demo[data-app="nib"] { --accent: #c2ad8a; --accent-soft: rgba(194, 173, 138, .16); }
.dim { color: var(--muted); }

.dtop { display: flex; align-items: center; gap: 16px; justify-content: space-between; padding: 12px var(--gutter); border-bottom: 1px solid var(--line); position: sticky; top: 0; background: rgba(14, 15, 16, .92); backdrop-filter: blur(8px); z-index: 20; }
.dtop__brand { display: flex; gap: 8px; align-items: baseline; font-weight: 600; letter-spacing: -.02em; font-size: 15px; white-space: nowrap; }
.dtop__brand i { color: var(--dim); font-style: normal; }
.dtop__tabs { display: flex; gap: 4px; background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 4px; }
.dtop__tabs button { background: none; border: 0; color: var(--muted); font: inherit; font-size: 14px; font-weight: 550; padding: 8px 14px; border-radius: 9px; cursor: pointer; }
.dtop__tabs button small { font-weight: 400; color: var(--dim); margin-left: 4px; }
.dtop__tabs button[aria-selected="true"] { background: var(--card); color: var(--fg); box-shadow: inset 0 0 0 1px var(--hair); }
.dtop__tabs button:hover { color: var(--fg); }
@media (max-width: 760px) { .dtop { flex-wrap: wrap; } .dtop__brand { display: none; } .dtop__tabs small { display: none; } }

/* stage */
.dstage { padding: 28px var(--gutter) 8px; }
.dstage__lead { max-width: 900px; margin: 0 auto 16px; text-align: center; color: var(--fg-2); font-size: 15px; }
.dstage__lead strong { color: var(--fg); font-weight: 600; }
.dstage__hint { text-align: center; color: var(--muted); font-size: 13px; margin: 12px 0 0; min-height: 1.4em; }
.win {
  --ar: 1.86; margin: 0 auto; border: 1px solid var(--line); border-radius: 12px; overflow: hidden; background: #000;
  width: min(100%, 1500px, max(min(100%, 980px), calc((100vh - 200px) * var(--ar)))); box-shadow: 0 30px 80px rgba(0, 0, 0, .5);
}
.win__bar { display: flex; align-items: center; gap: 6px; height: 28px; padding: 0 12px; background: #161718; border-bottom: 1px solid var(--line); font-size: 12px; color: var(--muted); }
.win__bar i { width: 9px; height: 9px; border-radius: 50%; background: #34373a; }
.win__bar span { margin-left: 10px; }
.win__view { position: relative; line-height: 0; user-select: none; }
.win__view img { width: 100%; height: auto; display: block; transition: opacity .18s; }
.win__view img.is-swap { opacity: .25; }

.hs { position: absolute; inset: 0; }
.hs button {
  position: absolute; border: 0; padding: 0; background: transparent; border-radius: 6px; cursor: pointer;
  outline: 1px solid transparent; transition: background .12s, outline-color .12s;
}
.hs button:hover, .hs button:focus-visible { background: rgba(255, 255, 255, .09); outline-color: var(--accent); }
.hs button[data-pulse]::after {
  content: ""; position: absolute; inset: 0; border-radius: 6px; pointer-events: none; border: 1.5px solid var(--accent); opacity: 0; animation: pulse 2.4s ease-in-out infinite;
}
@keyframes pulse { 0%, 100% { opacity: 0; transform: scale(.97); } 50% { opacity: .9; transform: scale(1); } }
@media (prefers-reduced-motion: reduce) { .hs button[data-pulse]::after { animation: none; opacity: .55; } }
.hs button .tip {
  position: absolute; left: 50%; top: 100%; transform: translate(-50%, 6px); white-space: nowrap; pointer-events: none; opacity: 0;
  background: #000; color: var(--fg); font: 500 12px/1 var(--sans); padding: 6px 8px; border-radius: 6px; border: 1px solid var(--line); z-index: 5;
}
.hs button:hover .tip { opacity: 1; }

.toast {
  position: absolute; left: 50%; bottom: 5%; transform: translate(-50%, 12px); opacity: 0; pointer-events: none; line-height: 1.4;
  background: rgba(10, 11, 12, .94); border: 1px solid var(--line); color: var(--fg); padding: 11px 16px; border-radius: 10px; font-size: 14px;
  max-width: 80%; text-align: center; transition: opacity .2s, transform .2s;
}
.toast.is-on { opacity: 1; transform: translate(-50%, 0); }

/* sections */
.dsec { padding: var(--sec) 0 0; }
.dsec h2 { font-size: clamp(26px, 4vw, 38px); letter-spacing: -.03em; margin: 0 0 10px; }
.dsec__sub { color: var(--fg-2); max-width: 640px; margin: 0 0 var(--head); }
.dgrid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--gap); }
@media (max-width: 860px) { .dgrid { grid-template-columns: 1fr; } }
.dcard { background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-lg); padding: var(--pad); }
.dcard h3 { margin: 0 0 16px; font-size: 20px; display: flex; gap: 10px; align-items: center; }
.pill { font: 500 11px var(--mono); letter-spacing: .08em; text-transform: uppercase; color: var(--accent); background: var(--accent-soft); padding: 4px 8px; border-radius: 99px; }
.dcard[data-card="nib"] { --accent: #c2ad8a; --accent-soft: rgba(194, 173, 138, .16); }
.track { list-style: none; margin: 0 0 20px; padding: 0; display: grid; grid-template-columns: repeat(5, 1fr); gap: 4px; }
.track li { font: 500 11px var(--mono); letter-spacing: .06em; text-transform: uppercase; color: var(--dim); padding-top: 10px; border-top: 3px solid var(--line); }
.track li.done { color: var(--muted); border-color: var(--dim); }
.track li.now { color: var(--fg); border-color: var(--accent); }
.facts { margin: 0; padding: 0; list-style: none; display: grid; gap: 12px; }
.facts li { color: var(--fg-2); font-size: 15px; padding-left: 18px; position: relative; }
.facts li::before { content: ""; position: absolute; left: 0; top: .6em; width: 6px; height: 6px; border-radius: 50%; background: var(--accent); }
.facts b { color: var(--fg); font-weight: 600; }

.dstory { max-width: 720px; }
.dstory h3 { font-size: 20px; margin: 36px 0 10px; letter-spacing: -.02em; }
.dstory p, .dstory li { color: var(--fg-2); font-size: 17px; line-height: 1.65; }
.dstory p { margin: 0 0 16px; }
.dstory ul { padding-left: 20px; margin: 0 0 16px; }
.byline { color: var(--muted) !important; font-size: 14px !important; margin-bottom: 28px !important; }
.dstory .cta { display: flex; gap: 14px; align-items: center; flex-wrap: wrap; margin-top: 36px; font-size: 14px; }
.dfoot { padding: 72px 0 40px; color: var(--muted); font-size: 14px; display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.dfoot a:hover { color: var(--fg); }