/* Shared by every page of auroyun.com: colour tokens (night and day), base, nav, buttons, section heads, footer. */
:root{
  /* night (default) */
  --bg:#05070F; --bg-2:#0A0E1C; --fg:#E9EDF7; --muted:rgba(233,237,247,.64); --faint:rgba(233,237,247,.42);
  --line:rgba(255,255,255,.09); --glass:rgba(255,255,255,.045); --glass-hi:rgba(255,255,255,.08);
  --aurora-1:#2DE0B9; --aurora-2:#7B61FF; --dawn:#FFB27A; --on-accent:#05070F;
  --veil:5,7,15; --spot:45,224,185;
  /* app (night UI) */
  --app-bg:#000000; --app-card:#1C1C1E; --app-row:#3A3A3C; --app-fg:rgba(255,255,255,.92); --app-sub:rgba(255,255,255,.55);
  --app-line:rgba(255,255,255,.08); --app-accent:#0A84FF; --app-ok:#30D158; --app-warn:#FFD60A; --app-side:#161618; --app-bar:#2C2C2E; --app-seg:#636366;
  /* phone mockup (the Android app's night sky) */
  --ph-top:#04051A; --ph-mid:#090A27; --ph-low:#130F35; --ph-bot:#1A1233; --ph-aurora:1; --ph-stars:1;
  --ph-sheet:#14133D; --ph-sheet-2:#0F0E2E; --ph-sheet-line:rgba(255,255,255,.12); --ph-line:rgba(255,255,255,.07);
  --ph-fg:rgba(255,255,255,.95); --ph-sub:rgba(255,255,255,.55); --ph-faint:rgba(255,255,255,.4); --ph-chip:rgba(255,255,255,.08); --ph-unlit:rgba(255,255,255,.14);
  --ph-mint:#2DE0B9; --ph-mint-text:#7FF5D9; --ph-violet:#7B61FF; --ph-violet-text:#9B87FF; --ph-gold:#FFB547; --ph-coral:#FF8A5B; --ph-blue:#5AB8FF;
  --ph-ok:#4BE8B0; --ph-warn:#FFC861; --ph-bad:#FF7A7A; --ph-sea-1:#1D2266; --ph-sea-2:#08081F; --ph-land:#C8E1FF;
  --ph-pin:rgba(14,14,40,.82); --ph-pin-line:rgba(255,255,255,.18); --ph-pin-text:#FFFFFF; --ph-nav:#0B0B22; --ph-track:rgba(255,255,255,.12);
  --font-display:"Noto Serif SC","Songti SC","STSong",serif;
  --font-body:"Noto Sans SC",-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SF Mono",Menlo,monospace;
  color-scheme:dark;
}
@media (prefers-color-scheme: light){
  :root:not([data-theme="dark"]){
    --bg:#F4F7FB; --bg-2:#EAF0F8; --fg:#0E1424; --muted:#4F5B74; --faint:#7C8699;
    --line:rgba(14,20,36,.09); --glass:rgba(255,255,255,.62); --glass-hi:rgba(255,255,255,.9);
    --aurora-1:#0FAE91; --aurora-2:#6A55F0; --dawn:#EE8A4C; --on-accent:#FFFFFF;
    --veil:244,247,251; --spot:106,85,240;
    --app-bg:#F2F2F7; --app-card:#FFFFFF; --app-row:#E5E5EA; --app-fg:#1C1C1E; --app-sub:#8E8E93;
    --app-line:rgba(0,0,0,.07); --app-accent:#007AFF; --app-ok:#34C759; --app-warn:#FF9F0A; --app-side:#E9E9EE; --app-bar:#DCDCE2; --app-seg:#FFFFFF;
    --ph-top:#F1EEFF; --ph-mid:#F7F6FF; --ph-low:#FFF7F1; --ph-bot:#FFEFE4; --ph-aurora:.55; --ph-stars:0;
    --ph-sheet:#FFFFFF; --ph-sheet-2:#FCFBFF; --ph-sheet-line:#E6E2F3; --ph-line:rgba(20,18,43,.07);
    --ph-fg:rgba(20,18,43,.92); --ph-sub:#5F5B7B; --ph-faint:#8F8BA8; --ph-chip:rgba(20,18,43,.06); --ph-unlit:rgba(20,18,43,.14);
    --ph-mint:#14B894; --ph-mint-text:#0B9C7D; --ph-violet:#6B55F0; --ph-violet-text:#7C68F2; --ph-gold:#E39A17; --ph-coral:#EE7A4E; --ph-blue:#3B86F0;
    --ph-ok:#0F9168; --ph-warn:#A86400; --ph-bad:#D13A3A; --ph-sea-1:#F2F4FF; --ph-sea-2:#CCD4F5; --ph-land:#4A4FC4;
    --ph-pin:rgba(255,255,255,.95); --ph-pin-line:#DCD8EE; --ph-pin-text:#1B1838; --ph-nav:#FFFFFF; --ph-track:rgba(20,18,43,.1);
    color-scheme:light;
  }
}
:root[data-theme="light"]{
  --bg:#F4F7FB; --bg-2:#EAF0F8; --fg:#0E1424; --muted:#4F5B74; --faint:#7C8699;
  --line:rgba(14,20,36,.09); --glass:rgba(255,255,255,.62); --glass-hi:rgba(255,255,255,.9);
  --aurora-1:#0FAE91; --aurora-2:#6A55F0; --dawn:#EE8A4C; --on-accent:#FFFFFF;
  --veil:244,247,251; --spot:106,85,240;
  --app-bg:#F2F2F7; --app-card:#FFFFFF; --app-row:#E5E5EA; --app-fg:#1C1C1E; --app-sub:#8E8E93;
  --app-line:rgba(0,0,0,.07); --app-accent:#007AFF; --app-ok:#34C759; --app-warn:#FF9F0A; --app-side:#E9E9EE; --app-bar:#DCDCE2; --app-seg:#FFFFFF;
  --ph-top:#F1EEFF; --ph-mid:#F7F6FF; --ph-low:#FFF7F1; --ph-bot:#FFEFE4; --ph-aurora:.55; --ph-stars:0;
  --ph-sheet:#FFFFFF; --ph-sheet-2:#FCFBFF; --ph-sheet-line:#E6E2F3; --ph-line:rgba(20,18,43,.07);
  --ph-fg:rgba(20,18,43,.92); --ph-sub:#5F5B7B; --ph-faint:#8F8BA8; --ph-chip:rgba(20,18,43,.06); --ph-unlit:rgba(20,18,43,.14);
  --ph-mint:#14B894; --ph-mint-text:#0B9C7D; --ph-violet:#6B55F0; --ph-violet-text:#7C68F2; --ph-gold:#E39A17; --ph-coral:#EE7A4E; --ph-blue:#3B86F0;
  --ph-ok:#0F9168; --ph-warn:#A86400; --ph-bad:#D13A3A; --ph-sea-1:#F2F4FF; --ph-sea-2:#CCD4F5; --ph-land:#4A4FC4;
  --ph-pin:rgba(255,255,255,.95); --ph-pin-line:#DCD8EE; --ph-pin-text:#1B1838; --ph-nav:#FFFFFF; --ph-track:rgba(20,18,43,.1);
  color-scheme:light;
}
:root[data-theme="dark"]{ color-scheme:dark }

*{box-sizing:border-box}
body{background:var(--bg);color:var(--fg);font-family:var(--font-body);font-size:16px;line-height:1.7;-webkit-font-smoothing:antialiased;overflow-x:hidden;transition:background-color .6s ease,color .6s ease}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--aurora-1);outline-offset:3px;border-radius:8px}
.wrap{width:min(1200px,100%);margin-inline:auto;padding-inline:24px}

/* ---------- nav ---------- */
.nav{position:absolute;inset:0 0 auto 0;z-index:5;padding-top:env(safe-area-inset-top,0px)}
.nav .wrap{display:flex;align-items:center;gap:28px;height:76px}
.brand{display:flex;align-items:center;gap:12px;font-weight:700;font-size:19px;letter-spacing:.5px}
.brand img{width:40px;height:40px;object-fit:contain}
.brand small{font-family:var(--font-mono);font-weight:500;font-size:12px;letter-spacing:1.5px;color:var(--faint);text-transform:uppercase}
.nav .links{display:flex;gap:30px;margin-left:auto;font-size:15px;color:var(--muted)}
.nav .links a:hover{color:var(--fg)}
.theme-btn{display:inline-flex;align-items:center;gap:8px;height:38px;padding:0 14px;border-radius:999px;border:1px solid var(--line);background:var(--glass);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);cursor:pointer;font-size:14px;color:var(--fg)}
.theme-btn svg{width:16px;height:16px}
/* Language menu (2026-11-08, i18n/build.py writes it into every page), next to the theme button. */
.lang-menu{position:relative;margin-right:-14px}
.lang-menu summary{display:inline-flex;align-items:center;gap:7px;height:38px;padding:0 14px;border-radius:999px;border:1px solid var(--line);background:var(--glass);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);font-size:14px;color:var(--fg);cursor:pointer;list-style:none;white-space:nowrap}
.lang-menu summary::-webkit-details-marker{display:none}
.lang-menu summary svg{width:16px;height:16px}
.lang-menu .short{display:none}
.lang-menu .menu{position:absolute;top:46px;right:0;min-width:150px;display:flex;flex-direction:column;padding:6px;border-radius:14px;border:1px solid var(--line);background:var(--bg);box-shadow:0 18px 50px rgba(0,0,0,.28);z-index:20}
.lang-menu .menu a{padding:8px 12px;border-radius:10px;font-size:15px;color:var(--muted);text-decoration:none}
.lang-menu .menu a:hover,.lang-menu .menu a[aria-current]{color:var(--fg);background:var(--glass-hi)}
.theme-btn .sun{display:none}
.is-light .theme-btn .sun{display:block}.is-light .theme-btn .moon{display:none}
.cta{height:40px;padding:0 20px;border-radius:999px;display:inline-flex;align-items:center;font-weight:700;font-size:15px;color:var(--on-accent);background:linear-gradient(100deg,var(--aurora-1),var(--aurora-2));box-shadow:0 8px 28px rgba(var(--spot),.35)}

.btn{height:54px;padding:0 28px;border-radius:999px;display:inline-flex;align-items:center;gap:10px;font-size:17px;font-weight:700;cursor:pointer;border:0}
.btn.primary{color:var(--on-accent);background:linear-gradient(100deg,var(--aurora-1),var(--aurora-2));box-shadow:0 14px 40px rgba(var(--spot),.4)}
.btn.ghost{border:1px solid var(--line);background:var(--glass);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);color:var(--fg)}
.btn svg{width:18px;height:18px}
section{padding-block:110px}
.sec-head{text-align:center;max-width:680px;margin-inline:auto}
.kicker{font-family:var(--font-mono);font-size:12px;letter-spacing:3px;text-transform:uppercase;color:var(--aurora-1)}
h2{font-family:var(--font-display);font-weight:600;font-size:clamp(30px,3.6vw,46px);line-height:1.2;letter-spacing:1.5px;margin:14px 0 0;text-wrap:balance}
.sec-head p{color:var(--muted);margin:14px 0 0;font-size:17px}
footer{border-top:1px solid var(--line);padding-block:52px 36px;color:var(--faint);font-size:14px}
.foot{display:flex;flex-wrap:wrap;gap:36px;justify-content:space-between;align-items:flex-start}
.foot-brand{display:flex;align-items:center;gap:12px}
.foot-brand img{width:40px;height:40px;object-fit:contain}
.foot-brand b{display:block;color:var(--fg);font-size:16px;font-weight:600}
.foot-brand span{font-size:13px}
.foot-links{display:flex;flex-wrap:wrap;gap:56px}
.foot-links div{display:flex;flex-direction:column;gap:8px}
.foot-links b{color:var(--fg);font-size:13px;font-weight:600;margin-bottom:2px}
footer a:hover{color:var(--fg)}
.foot-note{margin-top:30px;font-size:12px}

/* ---------- small screens ---------- */
@media (max-width:860px){
  .nav .links{display:none}
  .nav .wrap{gap:12px}.theme-btn span{display:none}.theme-btn{padding:0 11px}
  .lang-menu{margin-right:0}.lang-menu summary{padding:0 11px}.lang-menu .long{display:none}.lang-menu .short{display:inline}
  .brand small{display:none}
  .lang-menu{margin-left:auto}
  section{padding-block:80px}
}
@media (max-width:420px){ .wrap{padding-inline:16px} .cta{display:none} }
.preload .plate,.preload body,.preload .mac,.preload .screen{transition:none!important}
@media (prefers-reduced-motion: reduce){
  *,*:before,*:after{animation:none!important;transition:none!important}
}
.btn.off{opacity:.45;pointer-events:none;cursor:default}

/* ---------- inner pages (help, privacy, licenses, 404) ---------- */
.page-head{position:relative;overflow:hidden;padding:168px 0 56px;background:
  radial-gradient(60% 120% at 85% 0%,color-mix(in srgb,var(--aurora-2) 22%,transparent),transparent 70%),
  radial-gradient(50% 100% at 10% 0%,color-mix(in srgb,var(--aurora-1) 18%,transparent),transparent 70%),var(--bg);border-bottom:1px solid var(--line)}
.page-head h1{font-family:var(--font-display);font-weight:700;font-size:clamp(34px,5vw,54px);line-height:1.15;letter-spacing:1.5px;margin:12px 0 0}
.page-head p{color:var(--muted);font-size:17px;margin:14px 0 0;max-width:40em}
.prose{max-width:780px;padding-block:48px 110px}
.prose h2{font-family:var(--font-display);font-weight:600;font-size:clamp(24px,2.6vw,30px);letter-spacing:1px;margin:56px 0 0;scroll-margin-top:24px}
.prose h2:first-child{margin-top:8px}
.prose h3{font-size:18px;font-weight:700;margin:32px 0 0}
.prose p,.prose li{color:var(--muted)}
.prose p{margin:12px 0 0}
.prose ul,.prose ol{margin:12px 0 0;padding-left:1.4em}
.prose li{margin:6px 0}
.prose strong{color:var(--fg);font-weight:600}
.prose a{color:var(--aurora-1);text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:1px}
.prose code{font-family:var(--font-mono);font-size:.88em;padding:.1em .4em;border-radius:6px;background:var(--glass-hi);border:1px solid var(--line);color:var(--fg);overflow-wrap:anywhere}
.prose table{width:100%;border-collapse:collapse;margin:16px 0 0;font-size:15px}
.prose th,.prose td{text-align:left;padding:10px 12px;border-bottom:1px solid var(--line);vertical-align:top}
.prose th{color:var(--fg);font-weight:600}
.prose td{color:var(--muted)}
.prose td:first-child{white-space:nowrap}
.prose .wrap-first td:first-child{white-space:normal}
.note{margin:18px 0 0;padding:16px 18px;border-radius:16px;background:var(--glass);border:1px solid var(--line);color:var(--muted);font-size:15px}
.note strong{color:var(--fg)}
.toc{display:flex;flex-wrap:wrap;gap:10px;margin:22px 0 0;padding:0;list-style:none}
.toc a{display:inline-block;padding:7px 14px;border-radius:999px;border:1px solid var(--line);background:var(--glass);font-size:14px;color:var(--muted);text-decoration:none}
.toc a:hover{color:var(--fg);border-color:color-mix(in srgb,var(--aurora-1) 40%,var(--line))}
details.faq{margin:12px 0 0;border-radius:16px;background:var(--glass);border:1px solid var(--line)}
details.faq summary{cursor:pointer;list-style:none;padding:16px 46px 16px 18px;font-weight:600;color:var(--fg);position:relative}
details.faq summary::-webkit-details-marker{display:none}
details.faq summary:after{content:"";position:absolute;right:20px;top:50%;width:8px;height:8px;border-right:2px solid var(--faint);border-bottom:2px solid var(--faint);transform:translateY(-70%) rotate(45deg);transition:transform .2s ease}
details.faq[open] summary:after{transform:translateY(-30%) rotate(-135deg)}
details.faq .faq-body{padding:0 18px 16px}
details.faq .faq-body p:first-child{margin-top:0}
.updated{margin-top:56px;font-size:14px;color:var(--faint)}
.release-meta{margin:6px 0 0;font-size:14px;color:var(--faint)}
.prose h2 .tag{display:inline-block;vertical-align:middle;margin-left:10px;padding:2px 10px;border-radius:999px;font-family:var(--font-body);font-size:13px;font-weight:600;letter-spacing:0;color:var(--aurora-1);background:color-mix(in srgb,var(--aurora-1) 16%,transparent)}
.center{text-align:center}
@media (max-width:860px){ .page-head{padding:128px 0 40px} .prose{padding-block:36px 80px} }
@media (max-width:600px){ .foot-links{gap:32px} .prose td:first-child{white-space:normal} .prose th,.prose td{padding:10px 8px;overflow-wrap:anywhere} .prose table{font-size:14px} }