:root{
  --ink:#18202a; --muted:#5c6673; --paper:#fffdf7; --card:#ffffff; --line:#e7e3d9;
  --red:#e6443a; --purple:#8d4ed8; --yellow:#ffd84a; --mint:#bcebd7; --blue:#dcecff;
  --shadow:0 18px 50px rgba(30,35,45,.08); --radius:24px; --max:1180px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body.aiu-new, body.aiu-legacy-page{margin:0;background:var(--paper);color:var(--ink);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;line-height:1.6}
a{color:inherit}
.aiu-header{position:sticky;top:0;z-index:1000;background:rgba(255,253,247,.94);backdrop-filter:blur(12px);border-bottom:1px solid rgba(24,32,42,.08)}
.aiu-nav{max-width:var(--max);margin:auto;display:flex;align-items:center;gap:26px;padding:12px 22px}
.aiu-brand{display:flex;align-items:center;gap:10px;text-decoration:none;font-weight:900;letter-spacing:-.02em;margin-right:auto}
.aiu-brand img{width:46px;height:46px;object-fit:contain}
.aiu-navlinks{display:flex;align-items:center;gap:22px;font-size:.95rem;font-weight:700}
.aiu-navlinks a{text-decoration:none;color:#343d49}.aiu-navlinks a:hover{color:var(--red)}
.aiu-btn,.aiu-btn:visited{display:inline-flex;align-items:center;justify-content:center;gap:8px;text-decoration:none;border-radius:999px;padding:12px 18px;font-weight:850;border:1px solid #1d2630;background:#1d2630;color:#fff;transition:.18s ease;box-shadow:none}
.aiu-btn:hover{transform:translateY(-2px);box-shadow:0 8px 18px rgba(24,32,42,.14)}
.aiu-btn.light{background:white;color:var(--ink);border-color:#d8d3c7}.aiu-btn.red{background:var(--red);border-color:var(--red)}
.aiu-btn.purple{background:var(--purple);border-color:var(--purple)}
.aiu-hero{max-width:var(--max);margin:auto;padding:68px 22px 44px;display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center}
.eyebrow{display:inline-flex;align-items:center;gap:8px;background:var(--yellow);border:1px solid #e2be27;padding:7px 12px;border-radius:999px;font-weight:900;font-size:.82rem;letter-spacing:.03em;text-transform:uppercase}
.aiu-hero h1{font-size:clamp(3rem,6vw,6.25rem);line-height:.92;letter-spacing:-.065em;margin:18px 0 22px;max-width:800px;color:var(--ink)}
.aiu-hero h1 em{font-style:normal;color:var(--red)}
.lede{font-size:clamp(1.08rem,1.8vw,1.35rem);color:#434d59;max-width:680px}
.ctas{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}.micro{font-size:.9rem;color:var(--muted);margin-top:12px}
.hero-art{position:relative;min-height:520px}.hero-art .sheet{position:absolute;width:76%;border-radius:22px;box-shadow:var(--shadow);border:1px solid var(--line);background:white}.hero-art .a{left:2%;top:8%;transform:rotate(-5deg)}.hero-art .b{right:0;top:28%;transform:rotate(5deg)}.hero-art .sticker{position:absolute;left:10%;bottom:0;background:var(--mint);border:2px solid #466e5d;border-radius:50%;width:156px;height:156px;display:grid;place-items:center;text-align:center;font-weight:950;transform:rotate(-8deg);padding:18px;font-size:1.08rem;box-shadow:0 12px 24px rgba(0,0,0,.08)}
.band{border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:white}.band-inner{max-width:var(--max);margin:auto;padding:22px;display:flex;flex-wrap:wrap;justify-content:space-between;gap:14px;font-weight:850;color:#404a55}.band-inner span:before{content:'✓';color:var(--red);margin-right:8px;font-weight:1000}
.section{max-width:var(--max);margin:auto;padding:78px 22px}.section.slim{padding-top:46px;padding-bottom:46px}.section h2{font-size:clamp(2.15rem,4vw,4.1rem);line-height:1;letter-spacing:-.045em;margin:0 0 18px}.section-intro{font-size:1.18rem;color:var(--muted);max-width:790px;margin-bottom:34px}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.grid5{display:grid;grid-template-columns:repeat(5,1fr);gap:14px}.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:26px;box-shadow:0 8px 30px rgba(30,35,45,.035)}.card h3{font-size:1.35rem;margin:8px 0 8px;color:var(--ink)}.card p{margin:0;color:var(--muted)}.card .num{font-size:.8rem;text-transform:uppercase;letter-spacing:.08em;font-weight:950;color:var(--red)}
.use-card{min-height:270px;display:flex;flex-direction:column}.use-card .icon{font-size:2.1rem}.use-card .spacer{flex:1}.use-card a{margin-top:20px;font-weight:850;text-decoration:none;color:var(--red)}
.arcs{background:#202632;color:white}.arcs .section-intro{color:#cbd2d8}.arcs .card{box-shadow:none;border-color:#3b424d;background:#292f39}.arcs .card h3{color:white}.arcs .card p{color:#cbd2d8}.arcs .card .num{color:#ffd84a}.arcs .grid5 .card{padding:22px 19px}
.quote-strip{background:var(--mint);border-radius:32px;padding:40px;display:grid;grid-template-columns:.8fr 1.2fr;gap:36px;align-items:center}.quote-strip img{width:100%;border-radius:20px;border:1px solid rgba(0,0,0,.12)}.quote-strip blockquote{font-size:clamp(1.6rem,3vw,3rem);font-weight:950;line-height:1.03;letter-spacing:-.035em;margin:0}.quote-strip p{color:#395447}
.corp{display:grid;grid-template-columns:1fr 1fr;gap:22px}.corp .card:first-child{background:var(--blue)}.corp .card:last-child{background:#f0e6ff}.corp ul{padding-left:20px;color:#4f5863}.corp li{margin:8px 0}
.cartoon-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.cartoon-grid a{display:block;background:white;border:1px solid var(--line);border-radius:18px;padding:8px;text-decoration:none;transition:.18s ease}.cartoon-grid a:hover{transform:translateY(-4px);box-shadow:var(--shadow)}.cartoon-grid img{display:block;width:100%;border-radius:12px}
.cta-panel{background:var(--yellow);border:1px solid #d9b82f;border-radius:32px;padding:48px;display:flex;align-items:center;justify-content:space-between;gap:25px}.cta-panel h2{margin:0;font-size:clamp(2rem,4vw,3.8rem)}
.aiu-footer{margin-top:70px;background:#171d25;color:#e9edf0}.footer-inner{max-width:var(--max);margin:auto;padding:42px 22px;display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:28px}.footer-inner a{color:#e9edf0}.footer-note{color:#aab2bb;font-size:.9rem}.footer-title{font-weight:900;margin-bottom:8px}
.page-hero{max-width:var(--max);margin:auto;padding:68px 22px 28px}.page-hero h1{font-size:clamp(3rem,6vw,6rem);line-height:.92;letter-spacing:-.055em;margin:14px 0 20px}.page-hero p{font-size:1.25rem;max-width:800px;color:var(--muted)}
.split{display:grid;grid-template-columns:1fr 1fr;gap:30px;align-items:start}.feature-list{display:grid;gap:14px}.feature{padding:18px 20px;border-radius:18px;background:white;border:1px solid var(--line)}.feature strong{display:block;margin-bottom:5px}.license-note{font-size:.92rem;color:#69717b;border-left:4px solid var(--red);padding-left:14px}
/* Legacy course shell */
body.aiu-legacy-page{padding-top:0!important;background:#fbfaf5!important;color:var(--ink)!important;font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif!important}
body.aiu-legacy-page > .navbar{display:none!important}
body.aiu-legacy-page img{height:auto}
body.aiu-legacy-page #main{border:1px solid var(--line)!important;box-shadow:0 7px 22px rgba(30,35,45,.05);border-radius:18px!important;background:white!important}
body.aiu-legacy-page button{border:1px solid #cfc9bc;background:white;border-radius:999px;padding:8px 12px;font-weight:750;cursor:pointer}body.aiu-legacy-page button:hover{background:#fff3c2}
body.aiu-legacy-page > div:not(.aiu-header):not(.aiu-footer){max-width:1120px;margin-left:auto;margin-right:auto}
.legacy-intro{max-width:1120px;margin:24px auto 4px;padding:0 18px;color:#5c6673;font-size:.92rem}.legacy-intro a{font-weight:800;color:var(--red)}
@media(max-width:920px){.aiu-hero,.split,.quote-strip,.corp{grid-template-columns:1fr}.hero-art{min-height:460px}.grid5{grid-template-columns:repeat(2,1fr)}.grid3{grid-template-columns:1fr}.cartoon-grid{grid-template-columns:repeat(2,1fr)}.aiu-navlinks{display:none}.footer-inner{grid-template-columns:1fr}.cta-panel{align-items:flex-start;flex-direction:column}}
@media(max-width:560px){.aiu-hero{padding-top:42px}.aiu-hero h1{font-size:3.65rem}.hero-art{min-height:360px}.hero-art .sheet{width:86%}.hero-art .sticker{width:120px;height:120px;font-size:.86rem}.grid5{grid-template-columns:1fr}.cartoon-grid{grid-template-columns:1fr}.section{padding:58px 18px}.page-hero{padding-left:18px;padding-right:18px}.cta-panel{padding:30px}.aiu-nav{padding:10px 14px}}