/* aiaicip learn pages: same stage-blue world as the home page */
:root{
  --canvas:#0F1C30;--canvas-deep:#0A1526;--panel:#16263D;--panel-2:#1C2F4C;--panel-line:#264060;--line-strong:#5873A0;
  --accent:#FF4A3A;--accent-hover:#FF6A5C;--text-secondary:#A8B8CE;--text-primary:#EEF1F6;
  --ok:#5FD39A;--warn:#F5C451;
  --f-display:-apple-system,BlinkMacSystemFont,"SF Pro Display","Inter","Helvetica Neue",Helvetica,Arial,sans-serif;
  --f-body:-apple-system,BlinkMacSystemFont,"SF Pro Text","Inter","Helvetica Neue",Helvetica,Arial,sans-serif;
  --f-mono:"SF Mono",ui-monospace,Menlo,Consolas,monospace;
  --ease-out:cubic-bezier(.22,.8,.24,1);--ease-soft:cubic-bezier(.45,.05,.25,1);
  --gutter:clamp(16px,4vw,48px);--m-face:#EEF1F6;--m-ink:#0C1220;
  color-scheme:dark;
}
*,*::before,*::after{box-sizing:border-box}
html{overflow-x:hidden;overflow-x:clip;-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;overflow-x:hidden;overflow-x:clip;background:var(--canvas);color:var(--text-primary);font-family:var(--f-body);font-size:clamp(16px,.9vw + 11px,18px);line-height:1.6;letter-spacing:-.006em;-webkit-font-smoothing:antialiased}
body::before{content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;background:radial-gradient(50% 40% at 20% 0%,rgba(120,150,205,.12),transparent 70%),radial-gradient(40% 35% at 90% 30%,rgba(255,74,58,.06),transparent 70%)}
img,svg,video{display:block;max-width:100%}
a{color:inherit}
h1,h2,h3{font-family:var(--f-display);font-weight:600;letter-spacing:-.03em;line-height:1.05;margin:0;text-wrap:balance}
p{margin:0}
:focus-visible{outline:3px solid var(--accent);outline-offset:3px;border-radius:6px}
.vh{position:absolute!important;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);clip-path:inset(50%);white-space:nowrap}
.wrap{max-width:1200px;margin:0 auto;padding-left:var(--gutter);padding-right:var(--gutter)}
.mono{font-family:var(--f-mono);font-size:.78rem;letter-spacing:.02em}

/* nav */
.lnav{position:sticky;top:0;z-index:20;background:rgba(10,21,38,.86);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid rgba(38,64,96,.6)}
.lnav .wrap{display:flex;align-items:center;gap:18px;min-height:64px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;margin-right:auto}
.brand .m{width:46px;height:27px}.brand .wm{width:78px;height:24px;color:var(--text-primary)}
.lnav .back{color:var(--text-secondary);text-decoration:none;font-size:.92rem}
.lnav .back:hover{color:var(--text-primary)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;font:600 .98rem/1 var(--f-body);text-decoration:none;border-radius:999px;padding:14px 22px;border:0;cursor:pointer;transition:background .3s var(--ease-soft),transform .3s var(--ease-out),border-color .3s}
.btn-primary{background:var(--accent);color:#1A0805}
.btn-primary:hover{background:var(--accent-hover);transform:translateY(-2px)}
.btn-ghost{color:var(--text-primary);border:1.5px solid rgba(238,241,246,.45);background:transparent}
.btn-ghost:hover{border-color:var(--text-primary)}
.btn-sm{padding:10px 15px;font-size:.86rem}
@media (pointer:coarse){.btn{min-height:44px}}
@media (max-width:560px){.lnav .back{display:none}.brand .wm{display:none}}

/* page head */
.phead{padding:clamp(56px,9vw,120px) 0 clamp(36px,5vw,56px)}
.crumb{color:var(--text-secondary);text-decoration:none;font-size:.9rem;display:inline-flex;gap:8px;align-items:center}
.crumb:hover{color:var(--text-primary)}
.phead h1{font-size:clamp(2.6rem,6.4vw,5.6rem);margin-top:18px;max-width:14ch}
.phead .lede{margin-top:20px;color:var(--text-secondary);font-size:clamp(1.05rem,1.3vw,1.25rem);max-width:56ch}
.sec{padding:clamp(48px,7vw,96px) 0}
.sec h2{font-size:clamp(1.9rem,3.6vw,3rem)}
.sec .sub{margin-top:14px;color:var(--text-secondary);max-width:58ch}

/* footer */
.lfoot{margin-top:clamp(56px,8vw,110px);border-top:1px solid var(--panel-line);padding:36px 0 44px}
.lfoot .wrap{display:flex;flex-wrap:wrap;gap:20px 40px;align-items:center;justify-content:space-between}
.lfoot p{color:var(--text-secondary);font-size:.9rem;max-width:56ch}
.cta-band{margin-top:clamp(56px,8vw,100px);border-radius:28px;padding:clamp(28px,5vw,56px);background:linear-gradient(135deg,#1C2F4C,#132339);border:1px solid var(--panel-line);display:flex;flex-wrap:wrap;gap:20px 32px;align-items:center;justify-content:space-between}
.cta-band h2{font-size:clamp(1.6rem,3vw,2.4rem);max-width:20ch}

/* copy button */
.copy{display:inline-flex;align-items:center;gap:8px;font:600 .84rem/1 var(--f-body);color:var(--text-primary);background:rgba(238,241,246,.08);border:1px solid var(--line-strong);border-radius:999px;padding:9px 14px;cursor:pointer;transition:background .25s,border-color .25s}
.copy:hover{background:rgba(238,241,246,.14)}
.copy.done{border-color:var(--ok);color:var(--ok)}
.copy svg{width:15px;height:15px}

@media (prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important}html{scroll-behavior:auto}}
.wai{width:1.15em;height:1.15em;flex:none}