/* Base: reset, body, buttons, chips, focus ring, site header/footer. Uses tokens.css only. */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;min-height:100vh;display:flex;flex-direction:column;background:var(--color-bg);font:400 16px/1.5 var(--font-body);color:var(--color-text);-webkit-font-smoothing:antialiased}
body>main{flex:1}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
main:focus{outline:none}
.skip{position:absolute;left:8px;top:-100px;z-index:200;padding:12px 18px;background:var(--color-text);color:var(--color-bg);font:600 15px var(--font-body);text-decoration:none}
.skip:focus{top:8px}
h1,h2,h3,h4{font-family:var(--font-heading);font-weight:800;letter-spacing:-.02em;line-height:1.15;margin:0}
img{display:block;max-width:100%}
a{color:var(--color-accent-text);text-underline-offset:3px}
.i{width:1.25em;height:1.25em;flex:none;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.i.fill{fill:currentColor;stroke:none}
:focus-visible{outline:3px solid var(--color-accent);outline-offset:2px}
@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important;animation:none!important}}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:0 20px;border:2px solid var(--color-accent-strong);background:var(--color-accent-strong);color:#fff;font:600 15px/1 var(--font-body);text-decoration:none;cursor:pointer;border-radius:var(--radius)}
.btn:hover{background:var(--color-accent-strong-hover);border-color:var(--color-accent-strong-hover);color:#fff}
.btn.ghost{background:transparent;color:var(--color-text);border-color:var(--color-text)}
.btn.ghost:hover{background:var(--color-text);color:var(--color-bg)}
.chip{display:inline-flex;align-items:center;min-height:44px;padding:0 14px;border:1px solid var(--color-divider);background:transparent;color:var(--color-text);font:600 14px/1 var(--font-body);text-decoration:none;cursor:pointer;border-radius:var(--radius)}
.chip:hover{background:var(--color-surface)}
.chip.on,.chip[aria-current=true]{background:var(--color-text);border-color:var(--color-text);color:var(--color-bg)}

/* site header / footer */
.site-header,.site-footer{background:var(--color-bg);color:var(--color-text);font-family:var(--font-body)}
.site-header{position:relative;z-index:20;border-bottom:1px solid var(--color-divider)}
.site-header .bar{max-width:1440px;margin:0 auto;padding:0 clamp(16px,4vw,40px);min-height:64px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.site-header .brand{display:inline-flex;align-items:center;min-height:44px;font:800 20px/1 var(--font-heading);letter-spacing:-.02em;color:var(--color-text);text-decoration:none}
.site-header nav{display:flex;align-items:center;gap:4px}
.site-header nav a,.site-header .nav-toggle{display:inline-flex;align-items:center;justify-content:center;min-height:44px;min-width:44px;padding:0 12px;color:var(--color-text);font:600 15px/1 var(--font-body);text-decoration:none;background:none;border:0;cursor:pointer}
.site-header nav a:hover{color:var(--color-accent-text)}
.site-header .i{width:20px;height:20px}
.nav-toggle{display:none!important}
@media (max-width:759px){
  .nav-toggle{display:inline-flex!important}
  .site-header nav{display:none;position:absolute;left:0;right:0;top:100%;flex-direction:column;align-items:stretch;gap:0;background:var(--color-bg);border-bottom:1px solid var(--color-divider);padding:8px clamp(16px,4vw,40px) 12px}
  .site-header nav.open{display:flex}
  .site-header nav a{justify-content:flex-start}
}
.site-footer{padding:28px clamp(16px,4vw,40px);border-top:1px solid var(--color-divider);font-size:14px}
.site-footer .bar{max-width:1440px;margin:0 auto;display:flex;flex-wrap:wrap;gap:8px 24px;align-items:center;justify-content:space-between}
.site-footer a{display:inline-flex;align-items:center;gap:6px;min-height:44px;min-width:44px;color:var(--color-text);text-decoration:underline}
.site-footer a:hover{color:var(--color-accent-text)}
.site-footer nav{display:flex;flex-wrap:wrap;gap:0 20px}

/* toasts (public/js/site.js) */
.toasts{position:fixed;left:50%;bottom:calc(20px + env(safe-area-inset-bottom));transform:translateX(-50%);z-index:200;display:flex;flex-direction:column;gap:8px;align-items:center;pointer-events:none}
.toast{pointer-events:auto;display:flex;align-items:center;gap:14px;padding:12px 18px;background:var(--color-viewer);color:var(--color-bg);box-shadow:var(--shadow-lg);font:400 14px/1.3 var(--font-body);animation:toast-in .2s ease-out}
.toast button{min-height:32px;border:0;background:none;color:var(--viewer-soft);font:600 14px var(--font-body);text-decoration:underline;text-underline-offset:3px;cursor:pointer;padding:0}
.toast button:hover{color:#fff}
@keyframes toast-in{from{opacity:0;transform:translateY(8px)}}