/* Joywin Quant: shared design system (colors, type, buttons, cards, headers, spacing).
   Linked first on every page; page files keep only page-specific rules.
   Light + dark are both first-class: tokens flip via prefers-color-scheme and an
   explicit [data-theme] set by the header toggle. Components read tokens, never raw hex. */
:root{
  color-scheme: light;
  --ink:#1d1d1f; --gray:#6e6e73; --grey:#6e6e73; --soft:#aeaeb2; --line:#d2d2d7;
  --bg:#ffffff; --bg2:#f5f5f7; --panel:#f5f5f7; --black:#0c0c0f;
  --card:#ffffff; --glass:rgba(255,255,255,.72); --code-bg:#fbfbfd;
  --blue:#0071e3; --blue2:#0a84ff; --ok:#0a7d48; --okbg:#eff9f3;
  --warn:#c22f22; --warnbg:#fdf3f2; --err:#c22f22;
  --amber:#b26a00; --amberbg:#fbf1e3; --bluebg:#eef4ff;
  --hover:#b9b9c0; --ring:rgba(0,113,227,.55);
  --shadow-sm:0 1px 2px rgba(0,0,0,.05);
  --shadow:0 1px 2px rgba(0,0,0,.04), 0 10px 30px rgba(0,0,0,.07);
  --e1:cubic-bezier(.16,1,.3,1); --e2:cubic-bezier(.4,0,.2,1);
  --mono:ui-monospace,"SF Mono",SFMono-Regular,Menlo,Consolas,monospace;
  --sans:-apple-system,BlinkMacSystemFont,"SF Pro Display","SF Pro Text","Helvetica Neue",Helvetica,Arial,sans-serif;
}

/* Dark palette (Apple system-dark: true-black canvas, #1c1c1e elevated surfaces,
   brighter accents for contrast). Applied on explicit choice OR system preference. */
:root[data-theme="dark"]{
  color-scheme: dark;
  --ink:#f5f5f7; --gray:#98989e; --grey:#98989e; --soft:#6e6e73; --line:#2e2e30;
  --bg:#000000; --bg2:#1c1c1e; --panel:#1c1c1e; --black:#0c0c0f;
  --card:#1c1c1e; --glass:rgba(18,18,20,.72); --code-bg:#0c0c0f;
  --blue:#0a84ff; --blue2:#409cff; --ok:#30d158; --okbg:rgba(48,209,88,.16);
  --warn:#ff453a; --warnbg:rgba(255,69,58,.16); --err:#ff453a;
  --amber:#ff9f0a; --amberbg:rgba(255,159,10,.16); --bluebg:rgba(10,132,255,.16);
  --hover:#48484a; --ring:rgba(10,132,255,.6);
  --shadow-sm:0 1px 2px rgba(0,0,0,.4);
  --shadow:0 1px 2px rgba(0,0,0,.4), 0 12px 34px rgba(0,0,0,.55);
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    color-scheme: dark;
    --ink:#f5f5f7; --gray:#98989e; --grey:#98989e; --soft:#6e6e73; --line:#2e2e30;
    --bg:#000000; --bg2:#1c1c1e; --panel:#1c1c1e; --black:#0c0c0f;
    --card:#1c1c1e; --glass:rgba(18,18,20,.72); --code-bg:#0c0c0f;
    --blue:#0a84ff; --blue2:#409cff; --ok:#30d158; --okbg:rgba(48,209,88,.16);
    --warn:#ff453a; --warnbg:rgba(255,69,58,.16); --err:#ff453a;
    --hover:#48484a; --ring:rgba(10,132,255,.6);
    --shadow-sm:0 1px 2px rgba(0,0,0,.4);
    --shadow:0 1px 2px rgba(0,0,0,.4), 0 12px 34px rgba(0,0,0,.55);
  }
}

*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%}
body{font-family:var(--sans);color:var(--ink);background:var(--bg);-webkit-font-smoothing:antialiased}

/* header */
.top{display:flex;align-items:center;justify-content:space-between;padding:15px 24px;border-bottom:1px solid var(--line);position:sticky;top:0;background:var(--glass);backdrop-filter:saturate(180%) blur(20px);-webkit-backdrop-filter:saturate(180%) blur(20px);z-index:5}
.logo{display:flex;align-items:center;gap:10px;font-weight:600;font-size:16px;letter-spacing:-.01em}
.logo .mk{width:30px;height:30px;display:grid;place-items:center}
.logo .mk svg{width:30px;height:30px;display:block}
.who{display:flex;align-items:center;gap:12px;font-size:13px;color:var(--gray)}
.who .pill,.pill{padding:6px 13px;border:1px solid var(--line);border-radius:999px;background:var(--panel)}

/* buttons */
.btn{padding:8px 15px;border:1px solid var(--line);border-radius:999px;background:var(--card);color:var(--ink);font-size:13px;cursor:pointer;transition:.2s var(--e1);font-family:inherit;text-decoration:none;display:inline-flex;align-items:center;gap:6px}
.btn:hover{border-color:var(--hover);background:var(--panel)}
.btn.dark{background:linear-gradient(180deg,var(--blue2),var(--blue));color:#fff;border-color:transparent}
.btn.dark:hover{filter:brightness(1.05);transform:translateY(-1px);box-shadow:0 10px 24px rgba(0,113,227,.30);background:linear-gradient(180deg,var(--blue2),var(--blue))}
.btn:disabled{opacity:.45;cursor:default;transform:none;box-shadow:none}

/* theme toggle (sun/moon), injected into .who by theme.js */
.theme-tog{width:34px;height:34px;padding:0;border:1px solid var(--line);border-radius:999px;background:var(--card);color:var(--ink);display:grid;place-items:center;cursor:pointer;transition:.2s var(--e1);flex:none}
.theme-tog:hover{border-color:var(--hover);background:var(--panel);transform:translateY(-1px)}
.theme-tog:active{transform:translateY(0)}
.theme-tog svg{width:17px;height:17px;display:block}
/* fallback placement for pages with no header (e.g. login) */
.theme-tog.floating{position:fixed;top:15px;right:15px;z-index:50;box-shadow:var(--shadow)}

/* shared bits */
.section-h{font-family:var(--mono);font-size:11px;letter-spacing:.13em;text-transform:uppercase;color:var(--grey);margin:24px 0 10px}
.spin{width:16px;height:16px;border:2px solid var(--line);border-top-color:var(--blue);border-radius:50%;animation:sp .8s linear infinite;flex:none}
@keyframes sp{to{transform:rotate(360deg)}}
.gate{position:fixed;inset:0;z-index:20;display:grid;place-items:center;background:var(--bg);color:var(--gray);font-size:14px}
.err{color:var(--warn)}

/* global refinements */
html{scroll-behavior:smooth}
/* subtle, theme-aware scrollbars */
*{scrollbar-width:thin;scrollbar-color:color-mix(in srgb,var(--ink) 22%,transparent) transparent}
::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-track{background:transparent}
::-webkit-scrollbar-thumb{background:color-mix(in srgb,var(--ink) 20%,transparent);border-radius:999px;border:2px solid transparent;background-clip:padding-box}
::-webkit-scrollbar-thumb:hover{background:color-mix(in srgb,var(--ink) 34%,transparent);background-clip:padding-box}
::selection{background:color-mix(in srgb,var(--blue) 28%,transparent)}
a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:2px solid var(--ring);outline-offset:2px}
.btn{font-weight:500}
.btn:active{transform:translateY(0);box-shadow:none}
.pill{font-size:12.5px;color:var(--gray)}
/* shared page nav (text links, active highlighted) */
.nav{display:flex;align-items:center;gap:6px;margin-left:22px}
.nav a{font-size:13.5px;color:var(--gray);text-decoration:none;padding:7px 13px;border-radius:999px;transition:.18s var(--e1)}
.nav a:hover{background:var(--panel);color:var(--ink)}
.nav a.active{color:var(--ink);font-weight:500;background:var(--panel)}

/* Theme flips instantly (snappy); only the page canvas eases so the switch is not harsh.
   Transitioning every element was heavy on long pages, so it was removed. */
body{transition:background-color .22s var(--e2), color .22s var(--e2)}

/* respect reduced-motion preferences */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important}
}

/* header adapts on narrow screens instead of overflowing */
@media (max-width:900px){
  .top{flex-wrap:wrap;row-gap:10px}
  .top>div:first-child{flex:1 1 100%;min-width:0}
  .nav{overflow-x:auto;-webkit-overflow-scrolling:touch;scrollbar-width:none}
  .nav::-webkit-scrollbar{display:none}
  .nav a{white-space:nowrap}
  .who{width:100%;justify-content:flex-end}
  .who .pill{max-width:60vw;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
}