/* The KnifOne viewer – UI themes.
   Base geometry (spacing, radius, type scale, control shapes) is shared; a theme
   only sets the variables in the html[data-theme] blocks at the end.
   See docs/design-study.md. */

:root {
  --font: "Helvetica Neue", Helvetica, Arial, Inter, sans-serif;
  --mono: "SF Mono", ui-monospace, Menlo, Consolas, monospace;
  --r-panel: 14px; --r-ctl: 8px; --r-pill: 999px;
  --pad: 14px; --gap: 8px;
  --blur: blur(22px) saturate(1.5);
  --ease: 140ms cubic-bezier(.2,.7,.2,1);

  /* theme variables (defaults = Cupertino Light) */
  --stage: #f5f5f7;
  --panel: rgba(255,255,255,.74);
  --panel-solid: #ffffff;
  --panel-edge: rgba(255,255,255,.55);
  --panel-shadow: 0 8px 30px rgba(0,0,0,.10), 0 1px 2px rgba(0,0,0,.06);
  --hair: rgba(0,0,0,.08);
  --ctl: rgba(0,0,0,.05);
  --ctl-hover: rgba(0,0,0,.09);
  --ctl-active: rgba(0,0,0,.13);
  --text: #1d1d1f;
  --text-2: rgba(29,29,31,.62);
  --text-3: rgba(29,29,31,.40);
  --accent: #0a84ff;
  --accent-text: #ffffff;
  --accent-soft: rgba(10,132,255,.14);
  --ok: #34c759;
  --scheme: light;
}

/* ---------- base ---------- */
html, body { background: var(--stage); color: var(--text); font: 13px/1.45 var(--font); color-scheme: var(--scheme); -webkit-font-smoothing: antialiased; }
#ui, #side {
  background: var(--panel); -webkit-backdrop-filter: var(--blur); backdrop-filter: var(--blur);
  border-radius: var(--r-panel); box-shadow: var(--panel-shadow), inset 0 0 0 1px var(--panel-edge);
  color: var(--text);
}
#ui { top: 14px; left: 14px; width: 324px; padding: var(--pad); max-height: calc(100% - 28px); scrollbar-width: thin; scrollbar-color: var(--text-3) transparent; }
#ui > b { font-size: 20px; font-weight: 700; letter-spacing: -.02em; }
#ui > .dim { font-size: 12px; color: var(--text-2); margin-left: 4px; }
.dim { color: var(--text-2); }
#status { color: var(--text-2); font-size: 11px; font-variant-numeric: tabular-nums; margin: 6px 0 10px; letter-spacing: .01em; }

/* controls */
#ui select, #ui button, .pbar select, .pbar input, .scene select {
  font: inherit; color: var(--text); background: var(--ctl); border: none; border-radius: var(--r-ctl);
  padding: 7px 10px; margin: 3px 0; width: 100%; box-sizing: border-box; transition: background var(--ease), box-shadow var(--ease), transform var(--ease);
  outline: none;
}
#ui select, .pbar select, .scene select {
  appearance: none; -webkit-appearance: none; padding-right: 28px;
  background-image: linear-gradient(45deg, transparent 50%, var(--text-2) 50%), linear-gradient(135deg, var(--text-2) 50%, transparent 50%);
  background-position: calc(100% - 15px) 55%, calc(100% - 10px) 55%; background-size: 5px 5px, 5px 5px; background-repeat: no-repeat;
}
#ui select option { background: var(--panel-solid); color: var(--text); }
#ui button:hover, #ui select:hover { background-color: var(--ctl-hover); }
#ui button:active { background-color: var(--ctl-active); transform: scale(.985); }
#ui button:focus-visible, #ui select:focus-visible, #ui input:focus-visible { box-shadow: 0 0 0 3px var(--accent-soft); }
#ui button:disabled { opacity: .45; }
#ui input[type=range] { accent-color: var(--accent); height: 18px; }
.scene #fov { margin: 0; align-self: center; }
#ui input[type=checkbox] { accent-color: var(--accent); width: 14px; height: 14px; margin: 0 6px 0 0; vertical-align: -2px; }
#ui input[type=color] { border: none; background: var(--ctl); border-radius: var(--r-ctl); height: 30px; padding: 2px 4px; }
#ui input[type=text], .pbar input[type=text], .pbar input:not([type]) { background: var(--ctl); border: none; border-radius: var(--r-ctl); padding: 7px 10px; color: var(--text); }
.pbar input::placeholder { color: var(--text-3); }

/* primary-ish actions */
#spin.on, #sidetabs button.on { background: var(--accent); color: var(--accent-text); }
#spin.on:hover { background: var(--accent); filter: brightness(1.06); }

/* grouped rows */
.scene { grid-template-columns: auto 1fr; gap: 4px 10px; margin: 6px 0 2px; }
.scene label { color: var(--text-2); font-size: 12px; }
.pall { gap: 6px; margin: 2px 0; }
#views { gap: 4px; margin: 6px 0; }
#views button { padding: 6px 4px; font-size: 12px; }

/* segmented feel for the two 3-button rows */
.pall button, #views button { border-radius: var(--r-ctl); }

/* view selector with its language switch */
.cfgrow { display: flex; gap: 6px; align-items: stretch; }
.cfgrow select { flex: 1 1 auto; }
#ui .cfgrow button { flex: 0 0 auto; width: auto; padding: 7px 9px; font-size: 11px; font-weight: 600; letter-spacing: .04em; color: var(--text-2); }
#ui .cfgrow button:hover { color: var(--text); }

/* section separators */
#parts, #motion { border-top: 1px solid var(--hair); padding-top: 8px; margin-top: 10px; }
#motion .sect, #parts .sect { margin-bottom: 4px; }
#motion > div:first-child b, #parts > div:first-child b, #ui h4 { font-size: 11px; text-transform: uppercase; letter-spacing: .08em; color: var(--text-2); font-weight: 600; }

/* motion rows */
.mrow { margin: 0; gap: 0 8px; row-gap: 0; }
.mrow .play, #ui .mrow .play { width: 22px; height: 22px; flex: 0 0 22px; border-radius: 50%; padding: 0; font-size: 9px; line-height: 22px; margin: 0; }
#ui .mrow input[type=range] { height: 14px; margin: 0; }
.mrow span { color: var(--text-2); font-size: 11.5px; line-height: 1.2; margin: -1px 0 5px 30px; }
.mrow.off { opacity: .35; }

/* parts tree */
#parts label { padding: 3px 6px; border-radius: 6px; color: var(--text); font-size: 12px; transition: background var(--ease); }
#parts label:hover { background: var(--ctl); color: var(--text); }
#parts label.sel { background: var(--accent-soft); color: var(--text); }
#parts summary { font-size: 11px; text-transform: uppercase; letter-spacing: .06em; color: var(--text-2); font-weight: 600; padding: 6px 0 2px; }
#parts .bom { color: var(--text-3); font-size: 10.5px; font-variant-numeric: tabular-nums; margin-left: 7px; }
#parts details label { margin-left: 12px; }

/* side panel */
#side { top: 14px; right: 14px; bottom: 14px; }
#sidetabs { padding: 10px 10px 0; gap: 4px; }
#sidetabs button { background: transparent; color: var(--text-2); border: none; border-radius: var(--r-ctl); padding: 7px; font: inherit; font-weight: 500; transition: background var(--ease), color var(--ease); }
#sidetabs button:hover { background: var(--ctl); color: var(--text); }
#sidetabs button.on { background: var(--accent); color: var(--accent-text); }
#sidetabs #sideclose { flex: 0 0 32px; font-size: 16px; line-height: 1; }
#sidebody { padding: 12px; gap: 8px; }
#sidebody h3 { font-size: 17px; font-weight: 600; letter-spacing: -.01em; margin: 6px 0 2px; }
#sidebody p { margin: 4px 0; line-height: 1.5; }
#sidebody dl { font-size: 12.5px; gap: 5px 14px; }
#sidebody dt { color: var(--text-2); }
#sidebody a, #sidebody .toc a { color: var(--accent); }
#sidebody .toc a.on { color: var(--text); }
#sidebody iframe { border-radius: 10px; }
#sidebody .ggrid img { border-radius: 8px; }
#sidebody button { font: inherit; background: var(--ctl); color: var(--text); border: none; border-radius: var(--r-ctl); padding: 7px 12px; margin: 2px 4px 2px 0; }
#sidebody button:hover { background: var(--ctl-hover); }
#sidebody .dim { color: var(--text-2); font-size: 12px; }

/* scrollbars inside panels (WebKit) */
#ui::-webkit-scrollbar, #sidebody::-webkit-scrollbar { width: 8px; }
#ui::-webkit-scrollbar-thumb, #sidebody::-webkit-scrollbar-thumb { background: var(--text-3); border-radius: 8px; border: 2px solid transparent; background-clip: content-box; }
#ui::-webkit-scrollbar-track, #sidebody::-webkit-scrollbar-track { background: transparent; }

/* ---------- themes ---------- */

/* 1 Cupertino Light – defaults above */
html[data-theme="cupertino-light"] { }

/* 2 Cupertino Dark */
html[data-theme="cupertino-dark"] {
  --stage: #1c1c1e;
  --panel: rgba(28,28,30,.72); --panel-solid: #2c2c2e; --panel-edge: rgba(255,255,255,.08);
  --panel-shadow: 0 10px 40px rgba(0,0,0,.45), 0 1px 2px rgba(0,0,0,.4);
  --hair: rgba(255,255,255,.10);
  --ctl: rgba(255,255,255,.08); --ctl-hover: rgba(255,255,255,.13); --ctl-active: rgba(255,255,255,.18);
  --text: #f5f5f7; --text-2: rgba(245,245,247,.62); --text-3: rgba(245,245,247,.38);
  --accent: #0a84ff; --accent-text: #fff; --accent-soft: rgba(10,132,255,.28);
  --scheme: dark;
}

/* 3 Studio – Rams/Braun: warm paper, ink, one orange, no glass */
html[data-theme="studio"] {
  --stage: #ece9e3;
  --panel: rgba(246,244,239,.96); --panel-solid: #f6f4ef; --panel-edge: rgba(0,0,0,.10);
  --panel-shadow: 0 1px 0 rgba(0,0,0,.04);
  --blur: none;
  --hair: rgba(0,0,0,.12);
  --ctl: rgba(0,0,0,.045); --ctl-hover: rgba(0,0,0,.08); --ctl-active: rgba(0,0,0,.12);
  --text: #171614; --text-2: rgba(23,22,20,.6); --text-3: rgba(23,22,20,.38);
  --accent: #e8500a; --accent-text: #fff; --accent-soft: rgba(232,80,10,.16);
  --r-panel: 6px; --r-ctl: 4px;
  --scheme: light;
}

/* 4 Graphite Pro – engineering tool: flat, dense, amber, mono numerals */
html[data-theme="graphite"] {
  --stage: #121416;
  --panel: rgba(26,29,33,.96); --panel-solid: #1a1d21; --panel-edge: rgba(255,255,255,.06);
  --panel-shadow: 0 0 0 1px rgba(0,0,0,.6);
  --blur: none;
  --hair: rgba(255,255,255,.07);
  --ctl: rgba(255,255,255,.06); --ctl-hover: rgba(255,255,255,.10); --ctl-active: rgba(255,255,255,.14);
  --text: #e6e8eb; --text-2: rgba(230,232,235,.58); --text-3: rgba(230,232,235,.34);
  --accent: #ffb454; --accent-text: #1a1200; --accent-soft: rgba(255,180,84,.22);
  --r-panel: 8px; --r-ctl: 5px;
  --scheme: dark;
}

/* 5 Swiss Red – white, KnifOne red, Helvetica hierarchy */
html[data-theme="swiss"] {
  --font: "Helvetica Neue", Helvetica, Arial, Inter, sans-serif;
  --stage: #ffffff;
  --panel: rgba(255,255,255,.97); --panel-solid: #fff; --panel-edge: rgba(0,0,0,.12);
  --panel-shadow: 0 2px 12px rgba(0,0,0,.06);
  --blur: none;
  --hair: rgba(0,0,0,.14);
  --ctl: #f2f2f2; --ctl-hover: #e8e8e8; --ctl-active: #dcdcdc;
  --text: #111; --text-2: rgba(17,17,17,.6); --text-3: rgba(17,17,17,.38);
  --accent: #c4171a; --accent-text: #fff; --accent-soft: rgba(196,23,26,.14);
  --r-panel: 6px; --r-ctl: 6px;
  --scheme: light;
}
html[data-theme="swiss"] #ui > b { color: var(--accent); }
html[data-theme="swiss"] #motion > div:first-child b, html[data-theme="swiss"] #parts > div:first-child b, html[data-theme="swiss"] #parts summary { color: var(--text); }

/* part list: its own horizontal scroll, labels no longer cut off; the panel itself never scrolls sideways */
#ui { overflow-x: hidden; }
#plist { overflow-x: auto; overflow-y: hidden; scrollbar-width: none; }
#plist::-webkit-scrollbar { display: none; }
#plist-hs { position: sticky; bottom: 0; overflow-x: auto; overflow-y: hidden; height: 12px; margin-top: 2px; background: var(--panel-solid); border-radius: 6px;
  scrollbar-width: thin; scrollbar-color: var(--text-3) transparent; }
#plist-hs > div { height: 1px; }
#plist-hs::-webkit-scrollbar { height: 8px; }
#plist-hs::-webkit-scrollbar-thumb { background: var(--text-3); border-radius: 8px; border: 2px solid transparent; background-clip: content-box; }
#plist-hs::-webkit-scrollbar-track { background: transparent; }
#plist label { overflow: visible; text-overflow: clip; width: max-content; min-width: 100%; box-sizing: border-box; }
/* the part name is the handle now: a click on it opens the part, the checkbox beside it still only shows and hides */
#plist label .pn { cursor: pointer; }
#plist label .pn:hover { text-decoration: underline; }

#plist details, #plist summary { width: max-content; min-width: 100%; }

/* thesis language switch */
#sidebody .langbar { padding-bottom: 6px; border-bottom: 1px solid var(--hair); }
#sidebody .langbar a { padding: 3px 8px; border-radius: 6px; background: var(--ctl); color: var(--text-2); }
#sidebody .langbar a.on { background: var(--accent); color: var(--accent-text); }

/* gallery group tabs: one line */
#sidebody .gtabs { flex-wrap: nowrap; white-space: nowrap; gap: 4px 14px; overflow: hidden; justify-content: center; padding: 2px 0 6px; border-bottom: 1px solid var(--hair); }


/* bookmark tab at the top-right edge that shows / hides the side panel */
#sidetoggle { position: fixed; top: 14px; right: 0; z-index: 40; width: 26px; height: 34px;   /* same band as the theme pill (top 14, 34 high) */ border: none; border-radius: 10px 0 0 10px; cursor: pointer;
  background: var(--panel); -webkit-backdrop-filter: var(--blur); backdrop-filter: var(--blur); box-shadow: var(--panel-shadow), inset 0 0 0 1px var(--panel-edge);
  color: var(--text-2); font: 20px/1 var(--font); padding: 0; display: flex; align-items: center; justify-content: center; transition: background var(--ease), color var(--ease); }
#sidetoggle span { display: flex; align-items: center; justify-content: center; width: 10px; height: 16px; }   /* drawn chevron: exact geometric centre */
#sidetoggle svg { display: block; }
#sidetoggle { transition: right 700ms cubic-bezier(.22,.7,.2,1), background var(--ease), color var(--ease); }   /* moves with the panel */
#sidetoggle span { display: inline-block; transition: transform 180ms ease; }
#sidetoggle.open span { transform: rotate(180deg); }
#sidetoggle:hover { color: var(--text); background: var(--panel-solid); }

/* nested product groups */
#plist details.sub { margin-left: 14px; }
#plist details.sub summary { text-transform: none; letter-spacing: 0; font-size: 12px; color: var(--text); padding: 4px 0 2px; }
#plist details.sub label { margin-left: 12px; }

#sidebody img.big.static { cursor: default; }

/* loading screen */
#loader { position: fixed; inset: 0; z-index: 60; display: flex; align-items: center; justify-content: center;
  background: rgba(0,0,0,.18); -webkit-backdrop-filter: blur(8px) saturate(.8); backdrop-filter: blur(8px) saturate(.8);
  opacity: 1; transition: opacity 320ms ease; }
#loader[hidden] { display: none; }
#loader.out { opacity: 0; pointer-events: none; }
#loader .card { min-width: 260px; padding: 18px 22px; border-radius: var(--r-panel); background: var(--panel); -webkit-backdrop-filter: var(--blur); backdrop-filter: var(--blur);
  box-shadow: var(--panel-shadow), inset 0 0 0 1px var(--panel-edge); color: var(--text); text-align: center; font: 13px/1.4 var(--font); }
#loader .card b { display: block; font-size: 18px; font-weight: 700; letter-spacing: -.02em; margin-bottom: 12px; }
#loader .bar { height: 4px; border-radius: 4px; background: var(--ctl); overflow: hidden; margin: 0 0 10px; }
#loader .bar i { display: block; height: 100%; width: 0; background: var(--accent); border-radius: 4px; transition: width 200ms ease; }
#loader .bar i.busy { width: 30% !important; animation: loadslide 1.1s ease-in-out infinite; }
#loader .bar i.err { background: #c4171a; }
#loader span { color: var(--text-2); font-variant-numeric: tabular-nums; }
@keyframes loadslide { 0% { margin-left: 0; } 50% { margin-left: 70%; } 100% { margin-left: 0; } }

/* narrow screens (phones, small windows): controls collapse behind a menu button,
   the side panel takes the full width, the theme pill and bookmark stay usable */
#uitoggle { display: none; position: fixed; top: 14px; left: 14px; z-index: 45; width: 40px; height: 40px; border: none; border-radius: 12px; cursor: pointer;
  background: var(--panel); -webkit-backdrop-filter: var(--blur); backdrop-filter: var(--blur); box-shadow: var(--panel-shadow), inset 0 0 0 1px var(--panel-edge); color: var(--text); font: 18px/1 var(--font); }
body.narrow #uitoggle { display: block; }
body.narrow #ui { display: none; top: 62px; left: 8px; right: 8px; width: auto; max-height: calc(100% - 70px); }
body.narrow.ui-open #ui { display: block; }
body.narrow #side { left: 8px; right: 8px; width: auto; top: 62px; bottom: 8px; }
body.narrow #sidetoggle.open { right: 8px; top: 14px; }
body.narrow #themebar { top: 14px !important; }
body.narrow #loader .card { min-width: 0; width: 70vw; }

/* Side panel with a real flap, as ONE shape: the panel box is 26 px wider on the
   left; a clip-path cuts it into "rounded panel + tab" (path computed in JS from
   the box size), so background, glass blur and edges are continuous. The drop
   shadow comes from a blurred twin behind it (#sideglow), because a clip-path
   would cut a box-shadow off. The toggle button sits inside the tab region. */
#side { padding-left: 26px; width: calc(min(560px, 45vw) + 26px); box-sizing: border-box; box-shadow: none; border-radius: 0; }
#side, #sideglow { transition: transform 700ms cubic-bezier(.22,.7,.2,1), opacity 480ms ease; }
#side.out, #sideglow.out { transform: translateX(calc(100% + 30px)); opacity: 0; }
@media (prefers-reduced-motion: reduce) { #side, #sideglow, #sidetoggle { transition: none; } }
#sideglow { position: fixed; top: -16px; right: -16px; bottom: -16px; width: calc(min(560px, 45vw) + 26px + 60px); z-index: 39; pointer-events: none; filter: blur(9px); }   /* 30 px margin around the panel for the blur; clipped to OUTSIDE the panel shape so the translucent panel is not darkened */
#sideglow[hidden] { display: none; }
#sideglow > div { position: absolute; left: 30px; top: 30px; right: 30px; bottom: 30px; background: rgba(0,0,0,.20); transform: translateY(6px); }
#sidetabs { padding: 0 10px 0 0; height: 34px; align-items: center; gap: 4px; }
#sidetabs button { padding: 5px 7px; }
#sidetoggle.open { right: calc(min(560px, 45vw) + 14px); background: transparent; -webkit-backdrop-filter: none; backdrop-filter: none; box-shadow: none; border-radius: 10px 0 0 10px; }
#sidetoggle.open:hover { background: var(--ctl); }
body.narrow #side { width: auto; clip-path: none !important; border-radius: var(--r-panel); box-shadow: var(--panel-shadow), inset 0 0 0 1px var(--panel-edge); }
body.narrow #sideglow { display: none; }
body.narrow #sidetoggle.open { right: auto; left: 8px; top: 62px; }

#tour.on { background: var(--accent); color: var(--accent-text); }
/* narrow screens: motion and part list fold away behind their headings */
body.narrow #motion .sect, body.narrow #parts .sect { cursor: pointer; }
body.narrow #motion .sect::after, body.narrow #parts .sect::after { content: '▾'; float: right; color: var(--text-2); }
body.narrow #motion.folded > :not(.sect), body.narrow #parts.folded > :not(.sect) { display: none; }
body.narrow #motion.folded .sect::after, body.narrow #parts.folded .sect::after { content: '▸'; }