/* =====================================================
  Base / 页面、字体、可访问性与原子布局
===================================================== */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-height) + 20px); }
body { margin: 0; color: var(--navy); background: var(--white); font-family: var(--body-font); font-size: 14px; -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility; }
body.modal-open { overflow: hidden; }
img, svg { display: block; }
img { max-width: 100%; }
svg { flex-shrink: 0; }
a { color: inherit; text-decoration: none; }
button { font: inherit; }
a, button { -webkit-tap-highlight-color: transparent; }
a:focus-visible, button:focus-visible { outline: 3px solid #91b6ff; outline-offset: 3px; }
::selection { background: #bcd0ff; color: var(--navy); }
.container { width: min(calc(100% - 72px), var(--max-width)); margin-inline: auto; }
.icon { width: 19px; height: 19px; stroke: currentColor; stroke-width: 1.8; fill: none; stroke-linecap: round; stroke-linejoin: round; }
.icon--small { width: 15px; height: 15px; }
.icon--large { width: 24px; height: 24px; }
.icon--xlarge { width: 30px; height: 30px; }
.section { padding: 92px 0; border-bottom: 1px solid var(--line); }
.section--tint { background: var(--surface); }
.section-kicker { display: inline-flex; align-items: center; gap: 10px; color: var(--blue); font-weight: 850; font-size: 10px; letter-spacing: 1.8px; text-transform: uppercase; }
.section-kicker::before { content: ''; display: block; width: 19px; height: 2px; border-radius: 3px; background: var(--blue); }
.section-head { display: flex; justify-content: space-between; align-items: end; gap: 28px; margin-bottom: 32px; }
.section-head h2 { font-size: clamp(27px, 3vw, 36px); line-height: 1.25; letter-spacing: -.95px; font-weight: 820; margin: 12px 0 0; }
.section-head__aside { font-size: 13px; line-height: 1.8; color: var(--muted); text-align: right; margin: 0 0 3px; max-width: 430px; }
.eyebrow-dot { display: inline-block; width: 7px; height: 7px; background: var(--blue); border-radius: 50%; vertical-align: middle; margin-left: 5px; }
.txt-blue { color: var(--blue); }
.muted { color: var(--muted); }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 11px; border: 1px solid transparent; border-radius: 10px; padding: 0 20px; min-height: 47px; background: transparent; font-size: 12px; font-weight: 800; letter-spacing: .05px; cursor: pointer; white-space: nowrap; transition: border-color .22s ease, background .22s ease, transform .22s ease, box-shadow .22s ease; }
.btn:hover { transform: translateY(-2px); }
.btn--primary { color: white; background: var(--blue); box-shadow: 0 8px 18px rgba(36, 94, 255, .17); }
.btn--primary:hover { background: var(--blue-deep); box-shadow: 0 13px 24px rgba(36, 94, 255, .21); }
.btn--outline { background: var(--white); color: var(--blue); border-color: #c0d0fd; }
.btn--outline:hover { background: #f4f7ff; }
.btn--small { min-height: 39px; padding: 0 14px; font-size: 11px; }
.tag { display: inline-flex; align-items: center; width: fit-content; white-space: nowrap; border: 1px solid #e4eaf8; border-radius: 7px; padding: 6px 8px; color: #566c9c; background: #f7f9fe; font-size: 10px; font-weight: 700; line-height: 1.1; }
.tag-cloud { display: flex; flex-wrap: wrap; gap: 7px; }
.skip-link { position: fixed; z-index: 500; left: 15px; top: -90px; background: var(--blue); color: white; padding: 10px 14px; border-radius: 8px; }
.skip-link:focus { top: 12px; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; } }