/* reset */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px}
body{background:#F5F0EB;color:#222;font-family:Helvetica,'Open Sans',sans-serif;line-height:1.6;min-height:100vh}
/* skip-link */
.skip-link{position:absolute;top:-100px;left:0;z-index:1000;padding:.75rem 1rem;background:#FF6600;color:#fff;font-weight:bold;text-decoration:none;transition:top .2s}
.skip-link:focus{top:0}
/* css vars */
:root{
  --color-primary:#003366;
  --color-accent:#FF6600;
  --color-bg-warm:#F5F0EB;
  --color-text:#222;
  --color-white:#fff;
  --color-gray:#999;
  --color-primary-light:#E0F0FF;
  --color-accent-light:#FFE6CC;
  --font-heading:Georgia,'Noto Serif SC',serif;
  --font-body:Helvetica,'Open Sans',sans-serif;
  --font-data:Consolas,'Source Code Pro',monospace;
  --sidebar-width:280px;
  --gap:1.5rem;
}
/* header – sidebar on desktop */
.site-header{
  position:fixed;top:0;left:0;width:var(--sidebar-width);height:100vh;
  background:var(--color-primary);color:#fff;padding:2rem 1.5rem;
  display:flex;flex-direction:column;z-index:100;
  box-shadow:2px 0 8px rgba(0,0,0,.1)
}
.site-branding{display:flex;flex-direction:column;gap:.25rem}
.site-logo{font-family:var(--font-heading);font-size:1.8rem;font-weight:bold;color:#fff;letter-spacing:.05em}
.brand-tagline{font-size:.85rem;color:rgba(255,255,255,.7)}
/* navigation */
.site-nav{margin-top:2rem;flex:1}
.site-nav ul{list-style:none;display:flex;flex-direction:column;gap:.25rem}
.site-nav a{display:block;padding:.6rem 1rem;color:rgba(255,255,255,.85);text-decoration:none;font-family:var(--font-body);font-size:1rem;border-radius:4px;transition:background .2s,color .2s}
.site-nav a:hover,.site-nav a:focus-visible{background:rgba(255,255,255,.15);color:var(--color-accent)}
.site-nav a[aria-current="page"]{background:rgba(255,102,0,.2);color:var(--color-accent);font-weight:bold}
/* hamburger button – hidden on desktop */
.site-nav-toggle{display:none;position:absolute;top:1.5rem;right:1.5rem;background:transparent;border:none;cursor:pointer;padding:.5rem;z-index:101}
.hamburger,.hamburger::before,.hamburger::after{display:block;width:24px;height:2px;background:#fff;border-radius:1px;transition:transform .3s}
.hamburger{position:relative}
.hamburger::before,.hamburger::after{content:'';position:absolute;left:0}
.hamburger::before{top:-6px}
.hamburger::after{top:6px}
/* main content area (applied by page template) */
.main-content{margin-left:var(--sidebar-width);padding:2rem;min-height:100vh}
/* footer */
.site-footer{background:var(--color-primary);color:rgba(255,255,255,.85);padding:2.5rem 2rem;margin-left:var(--sidebar-width)}
.footer-inner{max-width:1200px;margin:0 auto;display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:1rem}
.footer-brand{font-family:var(--font-heading);font-size:1.4rem;font-weight:bold;color:#fff}
.footer-links{display:flex;gap:1.5rem;list-style:none}
.footer-links a{color:rgba(255,255,255,.75);text-decoration:none;font-size:.9rem;transition:color .2s}
.footer-links a:hover{color:var(--color-accent)}
.footer-contact{display:flex;gap:1rem;font-size:.85rem}
.footer-legal{width:100%;text-align:center;margin-top:1rem;font-size:.8rem;color:rgba(255,255,255,.5);border-top:1px solid rgba(255,255,255,.1);padding-top:1rem}
.footer-legal span{display:inline-block;margin:0 .5rem}
/* back-to-top */
.back-to-top{position:fixed;bottom:2rem;right:2rem;z-index:200;width:44px;height:44px;border-radius:50%;background:var(--color-accent);color:#fff;border:none;font-size:1.2rem;cursor:pointer;box-shadow:0 2px 8px rgba(0,0,0,.2);transition:opacity .3s,transform .3s}
.back-to-top:focus-visible{outline:3px solid var(--color-accent);outline-offset:2px}
.back-to-top[hidden]{opacity:0;pointer-events:none}
/* utilities */
:focus-visible{outline:3px solid var(--color-accent);outline-offset:2px}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important;scroll-behavior:auto!important}}
/* mobile responsive */
@media(max-width:1024px){
  :root{--sidebar-width:0}
  .site-header{width:100%;height:auto;position:relative;flex-direction:row;align-items:center;padding:1rem 1.5rem}
  .site-branding{flex-direction:row;align-items:center;gap:1rem}
  .brand-tagline{display:none}
  .site-nav-toggle{display:block}
  .site-nav{position:fixed;top:0;left:0;width:100%;height:100vh;background:var(--color-primary);padding:5rem 2rem 2rem;transform:translateX(-100%);transition:transform .3s;z-index:100}
  .site-nav[data-open]{transform:translateX(0)}
  .site-nav a{padding:.8rem 1rem;font-size:1.2rem}
  .main-content{margin-left:0}
  .site-footer{margin-left:0}
}
@media(max-width:600px){
  .footer-inner{flex-direction:column;text-align:center}
  .footer-contact{flex-direction:column;gap:.5rem}
}