:root { --blue: #176fc5; --ink: #172033; --muted: #5d6b80; --line: #dcecff; }
* { box-sizing: border-box; }
body { margin: 0; background: #f4f9ff; color: var(--ink); font: 16px/1.75 system-ui, "PingFang SC", sans-serif; }
.shell { width: min(860px, 100%); min-height: 100vh; margin: auto; padding: 28px 28px 48px; background: #fff; }
a { color: var(--blue); overflow-wrap: anywhere; }
a:hover { text-decoration-thickness: 2px; }
a:focus-visible, button:focus-visible, summary:focus-visible { outline: 3px solid var(--blue); outline-offset: 4px; }
.page-header, .language-switch, footer { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.page-header { justify-content: flex-end; }
.language-switch { gap: 2px; padding: 3px; border: 1px solid var(--line); border-radius: 999px; }
.language-switch button { padding: 7px 12px; border: 0; border-radius: 999px; background: transparent; color: var(--muted); font: 600 .85rem system-ui; cursor: pointer; }
.language-switch button.is-active { background: var(--blue); color: #fff; }
h1 { margin: 36px 0 12px; font-size: clamp(1.8rem, 5vw, 2.6rem); line-height: 1.2; letter-spacing: -.035em; }
h2 { margin: 0 0 12px; font-size: 1.35rem; line-height: 1.4; }
p { margin: 10px 0; }
.intro, .note { color: var(--muted); }
section { margin-top: 32px; }
.contact { padding: 24px; border: 1px solid var(--line); border-radius: 20px; background: #f0f8ff; }
.email { font-size: clamp(1.1rem, 4vw, 1.5rem); font-weight: 650; }
ul { padding-left: 24px; }
li { margin: 8px 0; }
details { padding: 16px 0; border-bottom: 1px solid var(--line); }
summary { font-weight: 600; cursor: pointer; }
details p { color: var(--muted); }
footer { margin-top: 42px; padding-top: 22px; border-top: 1px solid var(--line); font-size: .9rem; }
footer span { color: var(--muted); }
@media (max-width: 450px) { .shell { padding-inline: 18px; } .contact { padding: 18px; } }