/* Shared design tokens and accessible document defaults. */
:root {
	--background: #fff;
	--soft-background: #f5fbff;
	--primary-aqua: #6ecbf5;
	--cta-blue: #2ea7e0;
	--text: #2f3a45;
	--border: #d9eef8;
	--cta-hover: #258fc1;
	--cta-readable: #167aa8;
	--cta-readable-hover: #12658c;
	--link: #11628a;
	--muted: #596b78;
	--radius-card: 12px;
	--radius-button: 8px;
	--radius-input: 12px;
	--space-1: .5rem;
	--space-2: 1rem;
	--space-3: 1.5rem;
	--space-4: 2rem;
	--space-5: 3rem;
	--space-6: 4.5rem;
	--shadow: 0 5px 22px rgb(36 105 138 / 6%);
	--page-width: 1200px;
	--reading-width: 800px;
	--header-height: 76px;
}
* { box-sizing: border-box; }
html { scroll-padding-top: 100px; }
body { margin: 0; color: var(--text); background: var(--background); font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans JP", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif; line-height: 1.75; overflow-wrap: anywhere; }
a { color: var(--link); text-underline-offset: .25em; }
a:hover { text-decoration: underline; }
button, input, select, textarea { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
button { cursor: pointer; }
img { display: block; max-width: 100%; height: auto; }
svg { width: 24px; height: 24px; fill: none; stroke: currentColor; stroke-width: 1.8; }
h1, h2, h3, p { margin-top: 0; }
h1 { border-left: 5px solid var(--primary-aqua); border-bottom: 1px solid var(--border); padding: 0 0 .4em .55em; font-size: clamp(1.75rem, 4vw, 2.65rem); line-height: 1.5; letter-spacing: .035em; }
h2 { font-size: clamp(1.3rem, 2.3vw, 1.7rem); line-height: 1.5; }
h3 { font-size: 1rem; line-height: 1.6; }
ul { padding-left: 1.5rem; }
:focus-visible { outline: 3px solid #135d82; outline-offset: 4px; }
[hidden] { display: none !important; }
.screen-reader-text, .skip-link { position: absolute; width: 1px; height: 1px; padding: 0; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
.skip-link:focus { position: fixed; z-index: 1000; top: 10px; left: 10px; width: auto; height: auto; clip-path: none; padding: 1rem; color: var(--text); background: #fff; }
::selection { background: var(--border); }
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { scroll-behavior: auto !important; animation: none !important; transition: none !important; } }