:root{
  --bg:#ffffff;
  --surface:#ffffff;
  --surface-alt:#f4f7fb;
  --text:#26313c;
  --muted:#66727e;
  --navy:#283593;
  --blue:#1598d4;
  --green:#37b7e5;
  --green-dark:#1976b8;
  --orange:#f5b544;
  --border:#d9e0e6;
  --shadow:0 18px 50px rgba(25,42,60,.12);
  --radius:22px;
  --header-h:72px;
  --sidebar-w:290px;
}
[data-theme="dark"]{
  --bg:#101722;
  --surface:#17212e;
  --surface-alt:#1d2936;
  --text:#eef4f8;
  --muted:#aebbc6;
  --navy:#8dbef0;
  --blue:#72a9da;
  --green:#9ccd7b;
  --green-dark:#8ebd70;
  --orange:#f0b75c;
  --border:#2b3b4b;
  --shadow:0 18px 50px rgba(0,0,0,.28);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:88px}
body{margin:0;background:var(--bg);color:var(--text);font-family:"Inter",Arial,sans-serif;line-height:1.6}
a{color:inherit}
button,input{font:inherit}
.reading-progress{position:fixed;z-index:9999;top:0;left:0;height:4px;background:linear-gradient(90deg,var(--green),var(--orange));width:0}
.site-header{position:fixed;z-index:1000;top:0;left:0;right:0;height:var(--header-h);display:flex;align-items:center;justify-content:space-between;padding:0 22px;background:color-mix(in srgb,var(--surface) 92%,transparent);backdrop-filter:blur(14px);border-bottom:1px solid var(--border)}
.brand{display:flex;gap:14px;align-items:center;text-decoration:none;min-width:0}.brand-logo{width:126px;height:auto;display:block}.brand-divider{width:1px;height:34px;background:var(--border)}.brand-copy{min-width:0}.brand strong,.brand small{display:block}.brand strong{color:var(--navy);font-family:"Manrope",sans-serif;font-size:.98rem;line-height:1.2}.brand small{color:var(--muted);font-size:.72rem;margin-top:3px}
.header-actions{display:flex;gap:8px}.icon-button,.menu-button{border:1px solid var(--border);background:var(--surface);color:var(--text);width:42px;height:42px;border-radius:12px;cursor:pointer}.menu-button{display:none}
.sidebar{position:fixed;z-index:900;top:var(--header-h);bottom:0;left:0;width:var(--sidebar-w);background:var(--surface);border-right:1px solid var(--border);overflow:auto;padding:18px}
.sidebar-nav{display:grid;gap:10px}.sidebar-home,.sidebar-nav summary,.sidebar-nav details a{display:block;padding:10px 12px;border-radius:10px;text-decoration:none}.sidebar-home,.sidebar-nav summary{font-weight:900;color:var(--navy)}.sidebar-nav summary{cursor:pointer}.sidebar-nav details a{margin-left:10px;color:var(--muted);font-size:.92rem}.sidebar-nav a:hover,.sidebar-nav a.active{background:var(--surface-alt);color:var(--navy)}
.content{margin-left:var(--sidebar-w);padding-top:var(--header-h)}
.hero{min-height:calc(100vh - var(--header-h));display:grid;grid-template-columns:1.1fr .9fr;align-items:center;gap:50px;padding:80px clamp(28px,6vw,90px);background:radial-gradient(circle at 82% 18%,rgba(55,183,229,.28),transparent 29%),linear-gradient(135deg,#18246f,#283593 58%,#126ca1);color:#fff}
.eyebrow{display:inline-block;background:var(--orange);color:#172044;padding:7px 14px;border-radius:999px;font-weight:900;font-size:.8rem}.hero h1{font-family:"Manrope",sans-serif;font-size:clamp(3.4rem,7vw,6.4rem);line-height:1.02;letter-spacing:-.045em;margin:22px 0}.hero-lead{font-size:1.35rem;max-width:700px}.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:28px}.button{border:0;border-radius:14px;padding:14px 20px;font-weight:900;cursor:pointer;text-decoration:none}.button.primary{background:var(--green);color:#173019}.button.secondary{background:transparent;color:#fff;border:1px solid rgba(255,255,255,.5)}
.hero-visual{display:grid;place-items:center}.hero-brand-card{width:min(100%,460px);padding:46px 42px;border:1px solid rgba(255,255,255,.24);border-radius:28px;background:linear-gradient(145deg,rgba(255,255,255,.16),rgba(255,255,255,.07));box-shadow:0 30px 70px rgba(5,19,65,.35);backdrop-filter:blur(14px)}.hero-brand-card img{display:block;width:min(100%,330px);height:auto;margin:0 auto 28px}.hero-brand-card span{display:block;font-family:"Manrope",sans-serif;font-size:.78rem;font-weight:800;letter-spacing:.18em;text-align:center;color:#bdeeff}.hero-brand-card p{margin:16px 0 0;text-align:center;color:rgba(255,255,255,.82);font-size:1rem}
.overview-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;padding:28px clamp(28px,6vw,90px);background:var(--surface-alt)}.overview-grid a{background:var(--surface);padding:22px;border-radius:18px;text-decoration:none;box-shadow:var(--shadow)}.overview-grid span{display:grid;place-items:center;width:38px;height:38px;background:var(--navy);color:#fff;border-radius:50%;font-weight:900}.overview-grid strong,.overview-grid small{display:block}.overview-grid strong{margin-top:14px;color:var(--navy)}.overview-grid small{color:var(--muted)}
.part-intro{display:grid;grid-template-columns:auto 1fr;gap:22px;align-items:center;padding:36px clamp(28px,6vw,90px);color:#fff}.part-intro span{border:2px solid currentColor;border-radius:16px;padding:10px 14px;font-weight:900}.part-intro h2{font-family:"Manrope",sans-serif;font-size:2.45rem;line-height:1.08;letter-spacing:-.025em;margin:0}.part-intro p{margin:6px 0 0}.part-one{background:linear-gradient(100deg,#315f3b,#5e8d49)}.part-two{background:linear-gradient(100deg,#8d5c15,#d18b25)}.part-three{background:linear-gradient(100deg,#644b17,#aa7d27)}.part-four{background:linear-gradient(100deg,#365f35,#76964c)}
.section{padding:82px clamp(28px,6vw,90px)}.section.alt{background:var(--surface-alt)}.section-heading{text-align:center;margin-bottom:34px}.section-heading span{display:inline-block;background:var(--green);color:#173019;padding:7px 15px;border-radius:999px;font-weight:900}.section-heading h2{font-family:"Manrope",sans-serif;font-size:clamp(2.25rem,4.4vw,3.9rem);line-height:1.08;letter-spacing:-.035em;margin:14px 0;color:var(--navy)}.lead{max-width:880px;margin:0 auto 36px;text-align:center;font-size:1.18rem}
.site-footer{padding:54px 28px;text-align:center;background:linear-gradient(135deg,#18246f,#126ca1);color:#fff}.footer-logo{display:block;width:190px;height:auto;margin:0 auto 22px}.site-footer strong{display:block;font-family:"Manrope",sans-serif;font-size:1.2rem}.site-footer p{max-width:720px;margin:10px auto 18px;color:rgba(255,255,255,.76)}.site-footer a{color:#bdeeff;font-weight:700}
.search-overlay{position:fixed;z-index:2000;inset:0;background:rgba(0,0,0,.6);padding:8vh 20px}.search-dialog{max-width:760px;margin:auto;background:var(--surface);border-radius:22px;box-shadow:var(--shadow);max-height:84vh;overflow:auto}.search-header{display:flex;gap:10px;padding:16px;border-bottom:1px solid var(--border)}.search-header input{flex:1;padding:13px;border:1px solid var(--border);border-radius:12px;background:var(--bg);color:var(--text)}.search-results{padding:12px}.search-results a{display:block;padding:13px;border-radius:12px;text-decoration:none}.search-results a:hover{background:var(--surface-alt)}.search-results strong,.search-results small{display:block}.search-results small{color:var(--muted)}
@media(max-width:1020px){.menu-button{display:block}.sidebar{transform:translateX(-100%);transition:.25s}.sidebar.open{transform:translateX(0)}.content{margin-left:0}.overview-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:720px){.brand-logo{width:105px}.brand-divider,.brand-copy{display:none}.hero{grid-template-columns:1fr;padding-top:55px}.hero-visual{display:grid}.hero-brand-card{padding:32px 26px;margin-top:12px}.overview-grid{grid-template-columns:1fr}.part-intro{grid-template-columns:1fr}.part-intro h2{font-size:2.3rem}}
@media print{.site-header,.sidebar,.reading-progress,.search-overlay,.hero-actions{display:none!important}.content{margin:0;padding:0}.hero{min-height:auto;color:#000;background:#fff}.section,.part-intro{break-inside:avoid}.part-intro{color:#000;background:#fff!important;border-top:3px solid #000}}