*,*::before,*::after{box-sizing:border-box}
[hidden]{display:none!important}
:root{
  --accent:#1d4ed8; --accent-dark:#1e40af; --ink:#0f172a; --muted:#475569;
  --line:#e2e8f0; --bg:#ffffff; --bg-alt:#f8fafc; --radius:16px;
  --nav-h:64px;
}
html{scroll-behavior:smooth;scroll-padding-top:calc(var(--nav-h) + 8px)}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}
body{margin:0;font-family:Inter,system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;color:var(--ink);background:var(--bg);line-height:1.6;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:var(--accent)}
h1,h2,h3{line-height:1.15;letter-spacing:-.02em;margin:0 0 .6em}
p{margin:0 0 1em}
.wrap{width:100%;max-width:1120px;margin:0 auto;padding:0 20px}
.narrow{max-width:720px}
.center{text-align:center;justify-content:center}
.skip{position:absolute;left:-999px;top:8px;background:var(--accent);color:#fff;padding:8px 14px;border-radius:8px;z-index:100}
.skip:focus{left:8px}
:focus-visible{outline:3px solid #93c5fd;outline-offset:2px}

/* Nav */
.nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.9);backdrop-filter:saturate(180%) blur(10px);-webkit-backdrop-filter:saturate(180%) blur(10px);border-bottom:1px solid var(--line)}
.nav-inner{height:var(--nav-h);display:flex;align-items:center;justify-content:space-between;position:relative}
.brand{font-weight:800;font-size:1.1rem;color:var(--ink);text-decoration:none;letter-spacing:-.01em}
.menu-btn{width:44px;height:44px;display:inline-flex;flex-direction:column;justify-content:center;align-items:center;gap:5px;background:none;border:0;border-radius:10px;cursor:pointer;margin-right:-8px}
.menu-btn span{width:22px;height:2px;background:var(--ink);border-radius:2px;transition:transform .2s,opacity .2s}
.menu-btn[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.menu-btn[aria-expanded="true"] span:nth-child(2){opacity:0}
.menu-btn[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
.nav-links{display:none;position:absolute;top:var(--nav-h);left:0;right:0;background:#fff;border-bottom:1px solid var(--line);flex-direction:column;padding:8px 20px 16px;box-shadow:0 12px 24px -12px rgba(15,23,42,.15)}
.nav-links.open{display:flex}
.nav-links a{color:var(--ink);text-decoration:none;font-weight:500;padding:12px 0;border-bottom:1px solid var(--line)}
.nav-links a:last-child{border-bottom:0}
.nav-links a:hover{color:var(--accent)}
@media (min-width:768px){
  .menu-btn{display:none}
  .nav-links{display:flex;position:static;flex-direction:row;gap:28px;padding:0;border:0;box-shadow:none;background:none}
  .nav-links a{padding:8px 0;border:0}
}

/* Buttons */
.actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:12px 22px;border-radius:12px;font-weight:600;font-size:1rem;text-decoration:none;border:2px solid transparent;transition:background .15s,color .15s,border-color .15s,transform .15s}
.btn-primary{background:var(--accent);color:#fff}
.btn-primary:hover{background:var(--accent-dark)}
.btn-ghost{border-color:var(--line);color:var(--ink);background:#fff}
.btn-ghost:hover{border-color:var(--accent);color:var(--accent)}
.btn-small{min-height:44px;padding:10px 18px;font-size:.95rem;background:var(--accent);color:#fff;margin-top:auto;align-self:flex-start}
.btn-small:hover{background:var(--accent-dark)}
.btn-light{background:#fff;color:var(--accent)}
.btn-light:hover{background:#eff6ff}
.btn-outline-light{border-color:rgba(255,255,255,.6);color:#fff}
.btn-outline-light:hover{border-color:#fff;background:rgba(255,255,255,.08)}

/* Hero */
.hero{padding:64px 0 56px;background:radial-gradient(1200px 400px at 10% -10%,#eff6ff 0,transparent 60%),#fff}
.hero h1{font-size:clamp(2.1rem,6vw,3.6rem);font-weight:800;max-width:16ch}
.lead{font-size:clamp(1.05rem,2.2vw,1.25rem);color:var(--muted);max-width:60ch}
@media (min-width:768px){.hero{padding:112px 0 96px}}
.actions .btn{flex:1 1 auto}
@media (min-width:480px){.actions .btn{flex:0 0 auto}}

/* Sections */
.section{padding:64px 0}
@media (min-width:768px){.section{padding:96px 0}}
.section h2{font-size:clamp(1.7rem,4vw,2.4rem);font-weight:800;margin-bottom:32px}
.section-alt{background:var(--bg-alt);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
#about p{font-size:1.1rem;color:#334155}

/* Cards */
.grid{display:grid;grid-template-columns:1fr;gap:24px}
@media (min-width:640px) and (max-width:959px){.grid{grid-template-columns:repeat(2,1fr)}}
@media (min-width:960px){.grid{grid-template-columns:repeat(3,1fr)}}
.card{display:flex;flex-direction:column;background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:0 1px 2px rgba(15,23,42,.04);transition:transform .2s,box-shadow .2s}
.card:hover{transform:translateY(-4px);box-shadow:0 14px 30px -12px rgba(15,23,42,.18)}
.media{aspect-ratio:16/10;background:#e5e7eb;border-bottom:1px solid var(--line);overflow:hidden}
.media img{width:100%;height:100%;object-fit:cover;object-position:top}
.media-book{background:linear-gradient(180deg,#f1f5f9,#e2e8f0);padding:14px 0}
.media-book img{object-fit:contain;object-position:center;filter:drop-shadow(0 8px 14px rgba(15,23,42,.25))}
.card-body{display:flex;flex-direction:column;flex:1;padding:22px}
.tag{align-self:flex-start;font-size:.75rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--accent);background:#eff6ff;padding:4px 10px;border-radius:999px;margin-bottom:12px}
.card h3{font-size:1.25rem;font-weight:700;margin-bottom:10px}
.card p{color:var(--muted);font-size:.97rem;margin-bottom:20px}

/* Contact */
.contact{background:var(--accent);color:#fff}
.contact h2{color:#fff;margin-bottom:16px}
.contact p{color:#dbeafe;font-size:1.15rem}

/* Footer */
.footer{padding:28px 0;color:var(--muted);font-size:.9rem;text-align:center;border-top:1px solid var(--line)}
.card p em{padding-right:.12em}
.hero + .section{padding-top:24px}
@media (min-width:768px){.hero{padding-bottom:72px}.hero + .section{padding-top:40px}}