/* Tendline product page. Colourless shell; chroma only on data marks. */

/* ---------- Fonts (self-hosted, latin + latin-ext) ---------- */
@font-face{font-family:"Public Sans";font-style:normal;font-weight:400;font-display:swap;
  src:url("/assets/fonts/public-sans-latin-400.woff2") format("woff2");
  unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"Public Sans";font-style:normal;font-weight:600;font-display:swap;
  src:url("/assets/fonts/public-sans-latin-600.woff2") format("woff2");
  unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"Public Sans";font-style:normal;font-weight:400;font-display:swap;
  src:url("/assets/fonts/public-sans-latin-ext-400.woff2") format("woff2");
  unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}
@font-face{font-family:"Public Sans";font-style:normal;font-weight:600;font-display:swap;
  src:url("/assets/fonts/public-sans-latin-ext-600.woff2") format("woff2");
  unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}

/* ---------- Tokens (pinned) ---------- */
:root{
  color-scheme: light dark;
  --bg:#f4f6fb; --panel:#ffffff; --panel2:#eef2f8; --line:#d8e0ec; --line2:#b9c6db; --track:#e6ebf3;
  --fg:#1b2433; --mut:#5c6b82;
  --st-run:#16a34a; --st-repair:#dc2626; --st-unk:#9ca3af; --warn:#b07d12;
}
@media (prefers-color-scheme: dark){
  :root{
    --bg:#0b1220; --panel:#141d2e; --panel2:#1b2740; --line:#2a3852; --line2:#3a5c86; --track:#0e1626;
    --fg:#e6edf6; --mut:#8aa0bd; --warn:#cbb26b;
  }
}

/* ---------- Derived tokens ---------- */
:root{
  --font:"Public Sans","Noto Sans TC","Microsoft JhengHei",system-ui,sans-serif;
  --gutter:16px;
  --max:80rem;
  --col-gap:2rem;
  --field:var(--panel);
  --fg-hover:color-mix(in srgb,var(--fg) 82%,var(--bg));
  --hatch-line:rgba(27,36,51,.42);
  --hatch:repeating-linear-gradient(135deg,var(--hatch-line) 0 1.5px,transparent 1.5px 6px),var(--st-unk);
  --band-h:56px;
  /* the illustrated day: where each event falls, as a share of the band */
  --p-quiet:.26; --p-fault:.34; --p-order:.52; --p-close:.76;
}
@media (prefers-color-scheme: dark){
  :root{ --hatch-line:rgba(11,18,32,.6); }
}
@media (min-width:600px){ :root{ --gutter:24px; } }
@media (min-width:1024px){ :root{ --gutter:48px; } }

/* ---------- Base and browser surfaces ---------- */
*,*::before,*::after{box-sizing:border-box}
html{
  -webkit-text-size-adjust:100%;text-size-adjust:100%;
  scrollbar-color:var(--line2) var(--bg);
  background:var(--bg);
}
body{
  margin:0;min-width:320px;
  background:var(--bg);color:var(--fg);
  font-family:var(--font);font-size:1rem;line-height:1.6;font-weight:400;
  font-variant-numeric:tabular-nums;font-kerning:normal;
  caret-color:var(--fg);
  text-rendering:optimizeLegibility;
  overflow-x:clip;
  min-height:100dvh;display:flex;flex-direction:column;
}
main{flex:1}
@media (min-width:768px){ body{font-size:1.0625rem} }
::selection{background:var(--fg);color:var(--bg)}
h1,h2,h3,p,ol,ul,figure{margin:0}
ol,ul{padding:0}
img{display:block;max-width:100%;height:auto}
strong,b{font-weight:600}
a{
  color:inherit;
  text-decoration-line:underline;text-decoration-thickness:1px;
  text-underline-offset:.24em;text-decoration-color:var(--line2);
}
a:hover{text-decoration-color:currentColor}
:focus-visible{outline:2px solid var(--mut);outline-offset:2px;border-radius:2px}
:focus:not(:focus-visible){outline:none}
[hidden]{display:none !important}

.wrap{
  width:100%;max-width:calc(var(--max) + 2 * var(--gutter));
  margin-inline:auto;padding-inline:var(--gutter);
}
.sr-only{
  position:absolute !important;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0;
}
.skip{
  position:absolute;left:var(--gutter);top:-4rem;z-index:10;
  padding:.5rem .875rem;border-radius:3px;
  background:var(--fg);color:var(--bg);font-weight:600;text-decoration:none;
}
.skip:focus{top:.5rem}

/* ---------- Type scale ---------- */
.display{
  font-size:clamp(2.375rem,1.2rem + 4.6vw,5.25rem);
  line-height:1.02;letter-spacing:-.03em;font-weight:600;
  max-width:15.5em;text-wrap:balance;
}
.h2{
  font-size:clamp(1.875rem,1.25rem + 2.3vw,3.25rem);
  line-height:1.06;letter-spacing:-.028em;font-weight:600;text-wrap:balance;
}
.h3{
  font-size:clamp(1.5rem,1.15rem + 1.3vw,2.25rem);
  line-height:1.1;letter-spacing:-.022em;font-weight:600;text-wrap:balance;
}
.lede{
  font-size:clamp(1.125rem,1.04rem + .38vw,1.3125rem);
  line-height:1.5;max-width:34em;text-wrap:pretty;
}
.body{max-width:36em;text-wrap:pretty}
.small{font-size:.9375rem;line-height:1.55}

/* Traditional Chinese: keep phrases whole, no negative tracking */
:lang(zh-Hant) .display,:lang(zh-Hant) .h2,:lang(zh-Hant) .h3{
  word-break:keep-all;line-break:strict;overflow-wrap:anywhere;letter-spacing:0;
}
:lang(zh-Hant) .display{line-height:1.12}
:lang(zh-Hant) .h2,:lang(zh-Hant) .h3{line-height:1.2}
:lang(zh-Hant) body{line-height:1.75}
:lang(zh-Hant) .lede{line-height:1.65}

/* ---------- Status line (unavailable things) ---------- */
.status{
  display:inline-flex;align-items:baseline;gap:.55em;
  color:var(--mut);font-size:.9375rem;line-height:1.5;
}
.status-mark{
  flex:none;align-self:center;
  width:.6em;height:.6em;border:1px solid currentColor;
}
a.status{color:var(--fg)}

/* ---------- Header / nav ---------- */
.site-head{border-bottom:1px solid var(--line)}
.site-head .wrap{
  display:flex;flex-wrap:wrap;align-items:center;
  column-gap:1.5rem;row-gap:0;
  padding-block:.5rem;
}
.wordmark{
  font-weight:600;font-size:1.1875rem;letter-spacing:-.015em;line-height:1;
  text-decoration:none;margin-right:auto;padding-block:.75rem;
}
.nav{order:3;width:100%;margin-inline:-.5rem}
.nav ul{display:flex;flex-wrap:wrap;list-style:none;gap:0 .25rem}
.nav a{
  display:block;padding:.5rem;
  color:var(--mut);text-decoration:none;font-size:.9375rem;
}
.nav a:hover{color:var(--fg)}
.head-status{display:none}
.lang{display:flex;align-items:center;gap:.125rem;font-size:.9375rem;color:var(--mut)}
.lang a{display:block;padding:.5rem .375rem;text-decoration:none;color:var(--mut)}
.lang a:hover{color:var(--fg)}
.lang a[aria-current]{color:var(--fg);font-weight:600}
@media (min-width:768px){
  .site-head .wrap{min-height:4rem;flex-wrap:nowrap}
  .wordmark{margin-right:1.25rem}
  .nav{order:0;width:auto;margin:0 auto 0 0}
  .head-status{display:inline-flex;font-size:.875rem}
}

/* ---------- Hero ---------- */
.hero{padding-top:clamp(2.25rem,1.5rem + 2.4vw,3rem)}
.hero-grid{display:grid;row-gap:1.25rem}
.hero .request{margin-top:.5rem}
.hero-aside{display:grid;gap:.875rem;align-content:start}
.hero-aside .small{color:var(--mut);max-width:30em}
@media (min-width:1024px){
  .hero-grid{grid-template-columns:repeat(12,minmax(0,1fr));column-gap:var(--col-gap);row-gap:1.375rem}
  .hero-grid .display{grid-column:1 / -1}
  .hero-grid .lede{grid-column:1 / span 7}
  .hero .request{grid-column:1 / span 7;grid-row:3;margin-top:.25rem}
  .hero-aside{grid-column:9 / span 4;grid-row:3;padding-top:2.25rem}
}

/* ---------- Request form ---------- */
.request{display:grid;gap:.5rem;max-width:40rem}
.request label{font-weight:600;font-size:.9375rem;line-height:1.5}
.request-row{display:flex;flex-wrap:wrap;gap:.5rem}
.field{
  flex:1 1 15rem;min-width:0;height:3.25rem;margin:0;
  padding:0 1rem;border:1px solid var(--mut);border-radius:3px;
  background:var(--field);color:var(--fg);
  font:inherit;font-size:1.0625rem;line-height:1;
  appearance:none;
}
.field::placeholder{color:var(--mut);opacity:1}
.field:hover{border-color:var(--fg)}
.field:focus-visible{border-color:var(--fg);outline:2px solid var(--mut);outline-offset:2px}
.field[aria-invalid="true"]{border-color:var(--fg);border-style:dashed}
.btn{
  flex:0 0 auto;height:3.25rem;margin:0;padding:0 1.375rem;
  border:1px solid var(--fg);border-radius:3px;
  background:var(--fg);color:var(--bg);
  font:inherit;font-weight:600;font-size:1rem;line-height:1;white-space:nowrap;
  cursor:pointer;
}
.btn:hover{background:var(--fg-hover);border-color:var(--fg-hover)}
.btn:active{background:var(--fg);border-color:var(--fg)}
.btn:disabled{cursor:progress;background:var(--mut);border-color:var(--mut);color:var(--bg)}
@media (max-width:479px){ .btn{flex:1 1 100%} }
.hp{position:absolute;left:-10000px;top:auto;width:1px;height:1px;overflow:hidden}
.request-status{
  min-height:1.55em;font-size:.9375rem;line-height:1.55;color:var(--fg);
  display:flex;align-items:baseline;gap:.55em;
}
.request-status:empty{visibility:hidden}
.request-status[data-tone="sending"]{color:var(--mut)}
.request-status[data-tone="success"]::before,
.request-status[data-tone="invalid"]::before,
.request-status[data-tone="fallback"]::before{
  content:"";flex:none;align-self:center;width:.6em;height:.6em;border:1px solid currentColor;
}
.request-status[data-tone="success"]::before{background:currentColor}
.request[aria-busy="true"] .field{color:var(--mut)}

/* ---------- Ribbon (signature) ---------- */
.ribbon{
  --t:1;
  container-type:inline-size;
  margin-top:clamp(2rem,1.6rem + 1.6vw,2.75rem);
}
@media (min-width:768px){ .ribbon{--band-h:88px} }
@media (min-width:1200px){ .ribbon{--band-h:120px} }
.ribbon-head .wrap{
  display:flex;flex-wrap:wrap;align-items:center;gap:.5rem 1.5rem;
  padding-bottom:1.375rem;font-size:.875rem;line-height:1.5;color:var(--mut);
}
.ribbon-label{margin-right:auto}
.legend{display:flex;flex-wrap:wrap;gap:.25rem 1.125rem;list-style:none;color:var(--fg)}
.legend li{display:inline-flex;align-items:center;gap:.45rem}
.sw{flex:none;display:inline-block;width:.75rem;height:.75rem}
.sw-run{background:var(--st-run)}
.sw-unk{background:var(--hatch)}
.sw-rep{background:var(--st-repair)}
/* work-order flag, drawn like the ribbon mark: a 1px stem with a square at its head */
.sw-wo{position:relative;width:.5rem;height:.875rem;border-left:1px solid var(--fg)}
.sw-wo::before{content:"";position:absolute;top:0;left:-1px;width:.5rem;height:.5rem;background:var(--fg)}
.ribbon-toggle{
  min-height:2rem;margin:-.3125rem 0;padding:.25rem .875rem;
  border:1px solid var(--line2);border-radius:3px;background:transparent;color:var(--fg);
  font:inherit;font-size:.875rem;font-weight:600;line-height:1.2;cursor:pointer;
}
.ribbon-toggle:hover{border-color:var(--mut);background:var(--panel)}

.band{
  position:relative;height:var(--band-h);
  background:var(--track);
  border-block:1px solid var(--line);
}
.seg{position:absolute;top:0;bottom:0}
.seg-run1{left:0;width:calc(min(var(--t),var(--p-quiet)) * 100%);background:var(--st-run)}
.seg-unk{
  left:calc(var(--p-quiet) * 100%);
  width:calc(clamp(0,var(--t) - var(--p-quiet),var(--p-order) - var(--p-quiet)) * 100%);
  background:var(--hatch);
}
.seg-rep{
  left:calc(var(--p-fault) * 100%);
  right:calc((1 - min(var(--t),var(--p-close))) * 100%);
  background:var(--st-repair);
}
.seg-run2{
  left:calc(var(--p-close) * 100%);
  width:calc(max(0,var(--t) - var(--p-close)) * 100%);
  background:var(--st-run);
}
/* before the work order: the repair span waits at the order point, unseen */
.ribbon[data-state="producing"] .seg-rep,
.ribbon[data-state="quiet"] .seg-rep{left:calc(var(--p-order) * 100%);visibility:hidden}
/* the one authored moment: repair reaches back to where the fault began */
/* exponential ease-out written as linear() stops (same curve as the bezier .16,1,.3,1); ease-out is the fallback */
.ribbon[data-state="repair"] .seg-rep{
  transition:left 1.2s ease-out;
  transition:left 1.2s linear(0, .12 2%, .23 4%, .329 6%, .417 8%, .494 10%, .592 13%, .671 16%, .752 20%, .826 25%, .877 30%, .92 36%, .952 43%, .972 50%, .988 60%, .996 70%, .999 80%, 1 90%, 1);
}

.wo{
  position:absolute;left:calc(var(--p-order) * 100%);top:-1.125rem;bottom:-1px;
  width:1px;background:var(--fg);
}
.wo::before{content:"";position:absolute;top:0;left:0;width:.625rem;height:.625rem;background:var(--fg)}
.ribbon[data-state="producing"] .wo,
.ribbon[data-state="quiet"] .wo{display:none}
.playhead{
  display:none;position:absolute;top:-.375rem;bottom:-.375rem;
  left:calc(var(--t) * 100%);width:2px;margin-left:-1px;background:var(--fg);
}
.ribbon[data-state] .playhead{display:block}

.ribbon-steps{
  list-style:none;display:grid;gap:.75rem;
  padding:1.125rem var(--gutter) 0;
}
.ribbon-steps li{
  position:relative;padding-left:1.375rem;
  font-size:.9375rem;line-height:1.5;max-width:40rem;text-wrap:pretty;
  transition:none;
}
.ribbon-steps li::before{
  content:"";position:absolute;left:0;top:.4em;width:.75rem;height:.75rem;
}
.ribbon-steps [data-step="producing"]::before,
.ribbon-steps [data-step="closed"]::before{background:var(--st-run)}
.ribbon-steps [data-step="quiet"]::before{background:var(--hatch)}
.ribbon-steps [data-step="repair"]::before{background:var(--st-repair)}
.ribbon[data-state] .ribbon-steps li[data-upcoming]{color:var(--mut)}

@media (min-width:1024px){
  .ribbon-steps{
    gap:0;padding:0;
    grid-template-columns:
      calc(var(--p-quiet) * 100%)
      calc((var(--p-order) - var(--p-quiet)) * 100%)
      calc((var(--p-close) - var(--p-order)) * 100%)
      1fr;
  }
  .ribbon-steps li{max-width:none;padding:1rem 1.75rem 0 1rem}
  .ribbon-steps li:first-child{padding-left:max(var(--gutter),calc((100cqw - var(--max)) / 2))}
  .ribbon-steps li:last-child{padding-right:max(var(--gutter),calc((100cqw - var(--max)) / 2))}
  .ribbon-steps li::before{top:0;bottom:0;left:0;width:1px;height:auto;background:var(--line2) !important}
  .ribbon-steps li:first-child::before{display:none}
  .ribbon[data-state] .ribbon-steps li[data-current]::before{background:var(--fg) !important}
}

/* ---------- Sections ---------- */
.section-rule{border-top:1px solid var(--line)}

/* How it works */
.how{padding-block:clamp(5rem,3.5rem + 6vw,9rem) clamp(4rem,3rem + 4vw,7rem)}
.cap{display:grid;gap:1.75rem}
.cap + .cap{margin-top:clamp(4.5rem,3rem + 6vw,9rem)}
.cap-text .body{margin-top:1rem}
.shot{display:grid;gap:.75rem;min-width:0}
.shot-link{
  display:block;border:1px solid var(--line2);border-radius:2px;
  background:var(--panel);overflow:hidden;
}
.shot-link:hover{border-color:var(--mut)}
.shot-link:focus-visible{outline-offset:3px}
.shot-link img{width:100%;height:auto}
.shot-stack{display:grid;gap:.625rem}
.shot figcaption{font-size:.875rem;line-height:1.55;color:var(--mut);max-width:60ch}
@media (min-width:1024px){
  .cap{grid-template-columns:repeat(12,minmax(0,1fr));column-gap:var(--col-gap);row-gap:2.25rem;align-items:start}
  /* floor: narrow text column, large figure */
  .cap-floor .cap-text{grid-column:1 / span 4;padding-top:.25rem}
  .cap-floor .shot{grid-column:5 / -1}
  /* honest: heading and body side by side, wide crops beneath */
  .cap-honest .cap-text{grid-column:1 / -1;display:grid;grid-template-columns:subgrid}
  .cap-honest .h3{grid-column:1 / span 5}
  .cap-honest .body{grid-column:7 / span 6;margin-top:.3rem}
  .cap-honest .shot{grid-column:1 / -1}
  /* board: figure first, text to its right */
  .cap-board .shot{grid-column:1 / span 8;grid-row:1}
  .cap-board .cap-text{grid-column:9 / -1;grid-row:1;padding-top:.25rem}
}

/* Walkthrough */
.tour .wrap > div{
  display:flex;flex-wrap:wrap;align-items:baseline;justify-content:space-between;gap:.375rem 2rem;
  padding-block:1.75rem;border-block:1px solid var(--line);
}
.tour h2{font-size:1.25rem;line-height:1.3;font-weight:600;letter-spacing:-.01em}

/* Sandbox */
.sandbox{
  --field:var(--bg);
  margin-top:clamp(4.5rem,3rem + 5vw,8rem);
  background:var(--panel);border-block:1px solid var(--line);
  padding-block:clamp(4rem,3rem + 5vw,8rem);
}
/* the primary action carries the loudest heading after the hero */
#sandbox-title{font-size:clamp(2.125rem,1.2rem + 3.8vw,4.5rem);line-height:1.04;letter-spacing:-.03em}
:lang(zh-Hant) #sandbox-title{letter-spacing:0;line-height:1.15}
.sandbox-grid{display:grid;row-gap:1.25rem}
.sandbox .request{margin-top:1rem}
.sandbox-note{color:var(--mut);max-width:30em}
@media (min-width:1024px){
  .sandbox-grid{grid-template-columns:repeat(12,minmax(0,1fr));column-gap:var(--col-gap);row-gap:1.5rem}
  .sandbox-grid .h2{grid-column:1 / span 6}
  .sandbox-grid .body{grid-column:1 / span 6}
  .sandbox-form{grid-column:8 / -1;grid-row:1 / span 2;align-self:end;display:grid;gap:1rem}
  .sandbox .request{margin-top:0}
}

/* Work */
.work{padding-block:clamp(4.5rem,3rem + 5vw,8rem)}
.work-grid{display:grid;row-gap:1.25rem}
.work-grid .status{margin-top:.25rem}
@media (min-width:1024px){
  .work-grid{grid-template-columns:repeat(12,minmax(0,1fr));column-gap:var(--col-gap)}
  .work-grid .h2{grid-column:1 / span 5}
  .work-grid .work-body{grid-column:7 / -1;display:grid;gap:1.25rem;align-content:start;padding-top:.35rem}
}

/* Contact */
.contact .wrap > div{
  border-top:1px solid var(--line);
  padding-block:clamp(4.5rem,3rem + 6vw,9rem) clamp(4rem,3rem + 5vw,8rem);
}
.contact h2{max-width:13em}
.contact p{margin-top:1.5rem;font-size:clamp(1.25rem,1rem + 1vw,1.75rem);line-height:1.35}
.contact a{font-weight:600;text-decoration-color:var(--line2);text-underline-offset:.2em;overflow-wrap:anywhere}
.contact a:hover{text-decoration-color:currentColor}

/* Footer */
.site-foot{border-top:1px solid var(--line);font-size:.875rem;line-height:1.5;color:var(--mut)}
.site-foot ul{
  display:flex;flex-wrap:wrap;align-items:baseline;gap:.5rem 1.75rem;list-style:none;
  padding-block:1.75rem 2.25rem;
}
.site-foot .built{color:var(--fg)}
.site-foot .legal{margin:0;padding-bottom:1.5rem;font-size:.8125rem;font-variant-numeric:tabular-nums;max-width:none}
.site-foot ul{padding-bottom:.75rem}
.site-foot .status{font-size:.875rem}
@media (min-width:768px){ .site-foot .copy{margin-left:auto} }

/* ---------- Traditional Chinese headline: wrap only between phrases ---------- */
:lang(zh-Hant) .display .ph,:lang(zh-Hant) .lede .ph{display:inline-block}

/* ---------- 404 ---------- */
.notfound{padding-block:clamp(5rem,3.5rem + 6vw,9rem)}
.notfound .lede{margin-top:1.5rem}
.notfound .lede + .lede{margin-top:.5rem;color:var(--mut)}
.site-head .wordmark + .lang{margin-left:auto}
/* zh section headings: allow CJK breaks so balance can even the lines; strict keeps 。 off a new line */
:lang(zh-Hant) .h2,:lang(zh-Hant) .h3{word-break:normal;line-break:strict;overflow-wrap:normal;text-wrap:balance}