/* tinglilab.com — the one stylesheet.
   Tokens are the app's (:root in src/part1.html, via APP_STYLE.md): system fonts only, no web fonts, nothing external.
   Teal (--accent) means "you can press this": links, buttons, focus and the .com in the wordmark; nothing else.
   The tone colours --t1 to --t4 are the app's and are reserved: never used for decoration here. */

:root{
  --ink:#1b2733; --paper:#f6f8f9; --card:#ffffff; --line:#d8e0e6;
  --accent:#0b7a6b; --accent-ink:#ffffff; --ok:#0b7a6b; --warn:#b3760a; --fail:#b3362a; --muted:#5b6b78;
  --hl:#cfe9e2; --new:#fbe9c9;
  --t1:#d11a1a; --t2:#1f8f3a; --t3:#1f45d6; --t4:#7b1fa2; --t0:#7a8791;
  --org:#2b5a8a;
  --mono:'SFMono-Regular',Consolas,'Liberation Mono',Menlo,monospace;
  --sans:system-ui,-apple-system,'Segoe UI',Roboto,'Noto Sans SC','PingFang SC','Microsoft YaHei',sans-serif;
  /* the site's own */
  --accent-dark:#09675b;      /* hover on teal */
  --soft:#eef2f4;             /* the app's secondary buttons and code */
  --wide:960px;               /* the content column */
  --measure:36rem;            /* running text: about 65–75 characters */
}

/* ---------- base ---------- */
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);font-size:17px;line-height:1.5}
@media (min-width:720px){ body{font-size:18px} }
[hidden]{display:none !important}
.wrap{max-width:var(--wide);margin:0 auto;padding:0 16px}
main{display:block}
img{max-width:100%;height:auto}
:lang(zh-Hans){font-size:1.04em}

h1,h2,h3{line-height:1.2;margin:0 0 .5em;font-weight:700;letter-spacing:-.005em}
h1{font-size:clamp(1.75rem,1.2rem + 2.4vw,2.5rem)}
h2{font-size:clamp(1.375rem,1.15rem + 1.1vw,1.75rem)}
h3{font-size:1.15em;line-height:1.25}
p,ul,ol,dl,figure,blockquote{margin:0 0 1em}
ul,ol{padding-left:1.3em}
li{margin:.3em 0}
main p,main li,main dd,main dt,.lead{max-width:var(--measure)}
b,strong{font-weight:700}
code{font-family:var(--mono);font-size:.9em;background:var(--soft);padding:1px 5px;border-radius:4px}
hr{border:0;border-top:1px solid var(--line);margin:2em 0}

a{color:var(--accent);text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:.18em}
a:hover{text-decoration-thickness:2px}
:focus-visible{outline:2px solid var(--ink);outline-offset:2px}
.skip{position:absolute;left:-999px;top:8px;z-index:20;background:var(--card);color:var(--ink);padding:8px 12px;border:1px solid var(--line);border-radius:8px;font-weight:600}
.skip:focus{left:16px}

.muted{color:var(--muted)}
.small{font-size:.88em;color:var(--muted)}
.lead{font-size:clamp(1.1rem,1rem + .7vw,1.3rem);line-height:1.45;max-width:34em}

/* ---------- buttons (links that look like the app's buttons) ---------- */
.btn{display:inline-block;font-family:var(--sans);font-size:15px;font-weight:600;line-height:1.25;border:1px solid var(--accent);border-radius:8px;padding:12px 18px;background:var(--accent);color:var(--accent-ink);text-decoration:none;cursor:pointer;white-space:nowrap}
.btn:hover{background:var(--accent-dark);border-color:var(--accent-dark);text-decoration:none}
.btn.secondary{background:var(--soft);color:var(--ink);border-color:var(--line)}
.btn.secondary:hover{background:#e3e9ed;border-color:#c9d3da}
.btn.small{font-size:14px;padding:10px 14px}
.actions{display:flex;flex-wrap:wrap;gap:12px;align-items:center;margin:0 0 .9em}

/* ---------- the wordmark ---------- */
.brand{display:inline-block;color:var(--ink);text-decoration:none;font-weight:700;font-size:18px;line-height:1.3}
.brand:hover{text-decoration:none}
.brand .zh{font-size:1.11em;margin-right:6px}
.brand .dom{color:var(--accent)}
.brand.org .dom{color:var(--org)}
.brand .tag{font-size:14px;font-weight:700;color:var(--muted)}
.tag .nw{white-space:nowrap}
.brand .free{display:inline-block;font-size:11px;font-weight:700;line-height:1.6;color:#fff;background:var(--org);border-radius:5px;padding:0 6px;margin-left:7px;vertical-align:2px;white-space:nowrap}
.page .brand.org{font-size:22px}
.page .brand.org .free{font-size:12px;vertical-align:3px}
@media (max-width:719px){
  .site-head .brand{font-size:16px}
  .site-head .brand .sub{display:block;margin-top:2px}
  .site-head .brand .free{margin:0 7px 0 0}
  .site-head .brand .tag{font-size:13px}
  .site-head .brand .tag .sep{display:none}
}

/* ---------- header ---------- */
.site-head{border-bottom:1px solid var(--line);padding:12px 0 10px}
.head-row{display:grid;grid-template-columns:1fr auto;grid-template-areas:"brand brand" "nav btn";gap:8px 12px;align-items:start}
.head-row .brand{grid-area:brand}
.head-row .nav{grid-area:nav;min-width:0}
.head-row>.btn{grid-area:btn;justify-self:end}
.nav ul{list-style:none;margin:0;padding:0}
.nav a{text-decoration:none;font-weight:600}
.nav a:hover{text-decoration:underline}
.nav-wide{display:none}
.nav-phone summary{list-style:none;cursor:pointer;display:inline-block;padding:10px 0;font-weight:600;color:var(--accent);font-size:15px;line-height:1.25;-webkit-user-select:none;user-select:none}
.nav-phone summary::-webkit-details-marker{display:none}
.nav-phone summary::after{content:"";display:inline-block;width:.45em;height:.45em;margin-left:.5em;border:solid currentColor;border-width:0 2px 2px 0;transform:rotate(45deg);vertical-align:.25em}
.nav-phone[open] summary::after{transform:rotate(-135deg);vertical-align:-.05em}
.nav-phone ul{border-top:1px solid var(--line);margin-top:4px}
.nav-phone li{margin:0}
.nav-phone li a{display:block;padding:11px 0;border-bottom:1px solid var(--line);font-size:17px}
.nav a[aria-current="page"]{color:var(--ink)}
@media (min-width:720px){
  .site-head{padding:14px 0 12px}
  .head-row{display:flex;flex-wrap:wrap;align-items:center;gap:10px 24px}
  .head-row .brand{flex:0 1 auto}
  .head-row>.btn{order:2;margin-left:auto}
  .head-row .nav{order:3;flex:1 1 100%}
  .nav-phone{display:none}
  .nav-wide{display:flex;flex-wrap:wrap;gap:4px 22px;font-size:16px}
  .nav-wide a{display:inline-block;padding:4px 0;border-bottom:2px solid transparent}
  .nav-wide a[aria-current="page"]{border-bottom-color:var(--accent)}
}
@media (min-width:1200px){
  .site-head .wrap{max-width:1120px}
  .head-row{flex-wrap:nowrap}
  .head-row .nav{order:2;flex:1 1 auto;min-width:0;display:flex;justify-content:flex-end}
  .head-row>.btn{order:3;margin-left:0;flex:0 0 auto}
}

/* ---------- pages and sections ---------- */
.page{padding:32px 0 8px}
.page h1{margin-bottom:.35em}
.page .lead{margin-bottom:1.4em}
.section{padding:36px 0}
.section + .section{border-top:1px solid var(--line)}
.section h2{margin-top:0}
.long h2{margin-top:1.8em;padding-top:.8em;border-top:1px solid var(--line)}
.long h2:first-of-type{margin-top:1em}
.long h3{margin-top:1.4em}

.card{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:18px 20px}
.note{background:var(--card);border:1px solid var(--line);border-radius:8px;padding:12px 16px;margin:0 0 1em;max-width:var(--measure)}
.note p:last-child,.note ul:last-child{margin-bottom:0}
.status{font-weight:600;max-width:var(--measure)}

/* ---------- screenshots ---------- */
.shot{margin:0}
.shot img{display:block;width:100%;height:auto;border:1px solid var(--line);border-radius:10px;background:var(--card)}
@media (max-width:719px){ .shot img{max-width:300px;margin:0 auto} .shot.wide-only{display:none} }
.hero{padding:40px 0 28px}
.hero h1{font-size:clamp(1.9rem,1.15rem + 3.2vw,2.8rem);margin-bottom:.25em}
.hero h1 .zh{font-size:1.15em}
.hero h1 .sub{display:block;margin-top:.3em}
.hero h1 .tag{font-size:clamp(1rem,.9rem + .55vw,1.25rem)}
.hero h1 .sep{display:none}
.hero .lead{margin:0 0 .8em}
.hero .status{margin:0 0 1em}
.hero .shot{margin-top:28px}

/* feature cards */
.feature{display:grid;gap:16px 28px;background:var(--card);border:1px solid var(--line);border-radius:10px;padding:20px;margin:0 0 16px}
.feature h3{margin:0 0 .4em}
.feature h3 .zh{margin-right:4px}
.feature p{margin:0 0 .6em}
.feature p:last-child{margin-bottom:0}
.feature .shot img{background:var(--paper)}
@media (min-width:720px){
  .feature{padding:24px}
  .feature.with-shot{grid-template-columns:minmax(0,1fr) 320px;align-items:center;column-gap:32px}
  .feature .shot img{width:320px}
}
.pair{display:grid;gap:16px;margin:0 0 16px}
@media (min-width:720px){ .pair{grid-template-columns:1fr 1fr} }
.pair .feature{margin:0}
.ticks{list-style:none;padding:0;margin:20px 0 0}
.ticks li{padding-left:1.4em;position:relative;margin:.45em 0}
.ticks li::before{content:"";position:absolute;left:.1em;top:.62em;width:.45em;height:.25em;border:solid var(--accent);border-width:0 0 2px 2px;transform:rotate(-45deg)}
.cols{display:grid;gap:16px 32px}
@media (min-width:720px){ .cols{grid-template-columns:1fr 1fr} }

/* FAQ */
.qlist{columns:1;padding-left:1.3em;font-size:.95em}
@media (min-width:720px){ .qlist{columns:2;column-gap:32px} }
.qlist li{break-inside:avoid;max-width:none}
.faq h2{font-size:1.25em;margin-top:1.6em;padding-top:.8em;border-top:1px solid var(--line)}
.faq h2:first-of-type{margin-top:1.2em}

/* ---------- footer ---------- */
.site-foot{border-top:1px solid var(--line);margin-top:48px;padding:28px 0 44px;font-size:15px;color:var(--muted)}
.site-foot p{margin:0 0 .8em;max-width:var(--measure)}
.foot-links{list-style:none;padding:0;margin:16px 0 0;display:flex;flex-wrap:wrap;gap:6px 18px}
.foot-links li{margin:0}
.foot-links a{text-decoration:none;font-weight:600}
.foot-links a:hover{text-decoration:underline}

/* ---------- print ---------- */
@media print{
  .site-head .nav,.skip,.btn,.site-foot .foot-links{display:none !important}
  body{background:#fff;color:#000;font-size:11pt}
  a{color:#000}
  .site-head,.site-foot{border-color:#999}
  .shot img,.card,.feature,.note{border-color:#999}
  a[href^="http"]::after{content:" (" attr(href) ")";font-size:.85em;color:#555}
}