/* Techit Optimist YouTube Archive: shared style for the app page, Privacy Policy and Terms.
   Same colours, font (Kanit) and mountain-sky background as the main course site. No cookies, no ad trackers. */
:root{
  --bg:#080b1f;
  --bg-2:#10163a;
  --panel:rgba(16,22,58,.72);
  --gold:#f2c46a;
  --gold-hi:#ffdc98;
  --text:#f7efdc;
  --muted:#b8b4cc;
  --line:rgba(184,180,204,.18);
  --line-gold:rgba(242,196,106,.55);
  --serif:"Kanit",system-ui,sans-serif;
  --sans:"Kanit",system-ui,-apple-system,sans-serif;
  --gl:max(20px,env(safe-area-inset-left,0px));
  --gr:max(20px,env(safe-area-inset-right,0px));
  color-scheme:dark;
}
*{box-sizing:border-box}
html{background:var(--bg);scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--sans);font-weight:300;font-size:17px;line-height:1.8;-webkit-font-smoothing:antialiased}
body::before{content:"";position:fixed;inset:0;z-index:-1;background:linear-gradient(180deg,rgba(8,11,31,.72) 0%,rgba(8,11,31,.6) 45%,rgba(8,11,31,.86) 100%),url("bg-sky.jpg") center 30%/cover no-repeat}
a{color:var(--gold)}
a:hover{color:var(--gold-hi)}
:focus-visible{outline:2px solid var(--gold);outline-offset:3px;border-radius:4px}
h1,h2,h3{font-family:var(--serif);font-weight:500;line-height:1.35;margin:0;text-wrap:balance}
p{margin:0 0 1em}
.wrap{max-width:880px;margin:0 auto;padding-left:var(--gl);padding-right:var(--gr)}

.top{position:sticky;top:0;z-index:10;background:rgba(8,11,31,.8);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--line);padding-top:env(safe-area-inset-top,0px)}
.top .wrap{max-width:1080px;display:flex;align-items:center;justify-content:space-between;gap:16px;padding-block:14px}
.brand{font-family:var(--serif);font-weight:500;letter-spacing:.04em;color:var(--text);text-decoration:none;font-size:15px}
.brand span{color:var(--gold)}
.top nav{display:flex;gap:20px;flex-wrap:wrap;font-size:14.5px}
.top nav a{color:var(--muted);text-decoration:none}
.top nav a:hover,.top nav a[aria-current="page"]{color:var(--gold)}

header.hero{padding-block:clamp(56px,9vw,104px) 36px}
.kicker{font-size:13px;letter-spacing:.06em;text-transform:uppercase;color:var(--gold)}
header.hero h1{font-size:clamp(32px,5vw,52px);margin-top:12px}
header.hero .lede{color:var(--muted);font-size:clamp(17px,1.6vw,19px);max-width:60ch;margin-top:16px}
.meta{margin-top:18px;font-size:14px;color:var(--muted)}

.lang{display:inline-flex;gap:6px;margin-top:26px;padding:4px;border:1px solid var(--line);border-radius:999px;background:rgba(8,11,31,.5)}
.lang button{font:inherit;font-size:14px;color:var(--muted);background:none;border:0;border-radius:999px;padding:6px 16px;cursor:pointer}
.lang button[aria-pressed="true"]{background:var(--gold);color:#1a1405;font-weight:500}
html.js [data-lang][hidden]{display:none}

main{padding-bottom:80px}
section.part{margin-top:22px;padding:clamp(22px,4vw,34px);background:var(--panel);border:1px solid var(--line);border-radius:18px}
section.part h2{font-size:clamp(20px,2.4vw,24px);margin-bottom:12px;color:var(--text)}
section.part h2 .n{color:var(--gold);margin-right:8px}
section.part ul{margin:0 0 1em;padding-left:1.2em}
section.part li{margin:.35em 0}
section.part li::marker{color:var(--gold)}
.note{border-left:3px solid var(--gold);padding:10px 16px;background:rgba(242,207,120,.07);border-radius:0 10px 10px 0;margin:0 0 1em;color:var(--text)}
table{width:100%;border-collapse:collapse;font-size:15px;margin:4px 0 1em}
th,td{text-align:left;vertical-align:top;padding:10px 12px;border-bottom:1px solid var(--line)}
th{color:var(--gold);font-weight:500;white-space:nowrap}
.tbl{overflow-x:auto}
code{font-family:ui-monospace,Menlo,monospace;font-size:.88em;color:var(--gold-hi);background:rgba(242,207,120,.08);padding:1px 6px;border-radius:5px;white-space:nowrap}

.cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin-top:8px}
.card{padding:20px 22px;border:1px solid var(--line);border-radius:14px;background:rgba(8,11,31,.45)}
.card h3{font-size:18px;color:var(--gold);margin-bottom:6px}
.card p{margin:0;color:var(--muted);font-size:15.5px}
.links{display:flex;flex-wrap:wrap;gap:12px;margin-top:8px}
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:10px 22px;border-radius:999px;border:1px solid var(--gold);background:var(--gold);color:#1a1405;text-decoration:none;font-weight:500}
.btn:hover{background:var(--gold-hi);color:#1a1405}
.btn.ghost{background:transparent;color:var(--text);border-color:var(--line-gold)}
.btn.ghost:hover{color:var(--gold-hi)}

footer{border-top:1px solid var(--line);padding-block:30px calc(40px + env(safe-area-inset-bottom,0px));color:var(--muted);font-size:14px}
footer .wrap{max-width:1080px;display:flex;justify-content:space-between;gap:12px 30px;flex-wrap:wrap}
footer a{color:var(--muted)}

@media (max-width:640px){
  .cards{grid-template-columns:1fr}
  .top nav{gap:14px}
  /* tables become label-over-value rows, so values get the full width instead of a narrow column */
  .tbl table,.tbl tbody,.tbl tr,.tbl th,.tbl td{display:block;width:100%}
  .tbl tr{padding:12px 0;border-bottom:1px solid var(--line)}
  .tbl th,.tbl td{border:0;padding:0}
  .tbl th{font-size:13.5px;margin-bottom:4px;white-space:normal}
  .tbl td{font-size:15.5px;line-height:1.75}
  .tbl td code{white-space:nowrap}
  .tbl tr.thead{display:none}
}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}