:root {
    --bi-ink: #202329;
    --bi-muted: #67717d;
    --bi-paper: #f4f5f7;
    --bi-surface: #ffffff;
    --bi-night: #171a20;
    --bi-night-raised: #22262e;
    --bi-night-text: #f3f5f8;
    --bi-night-muted: #b3bdca;
    --bi-line: #dfe3e8;
    --bi-line-dark: #3b424c;
    --bi-accent: #6d36d9;
    --bi-accent-hover: #5828b8;
    --bi-action-fill: #6d36d9;
    --bi-action-hover: #5828b8;
    --bi-action-active: #492195;
    --bi-accent-soft: #f0e9ff;
    --bi-focus: #8b4dff;
    --bi-anchor-offset: 92px;
    --bi-error: #b52c3c;
    --bi-success: #176542;
    --bi-space-1: 4px;
    --bi-space-2: 8px;
    --bi-space-3: 12px;
    --bi-space-4: 16px;
    --bi-space-6: 24px;
    --bi-space-8: 32px;
    --bi-space-12: 48px;
    --bi-space-16: 64px;
    --bi-radius-control: 8px;
    --bi-radius-card: 12px;
    --bi-shadow: 0 16px 48px rgb(25 23 32 / 12%);
    --bi-font: Inter, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}
html { scroll-padding-top: var(--bi-anchor-offset); }
body .bi-page :is(.bi-section[id],.bi-value[id],.bim-faq[id]) {
    scroll-margin-top: calc(0px - var(--bi-anchor-inset,0px));
}
body #bi-guide .bg-article section[id] {
    scroll-margin-top: calc(var(--bg-section-offset,120px) - var(--bi-anchor-offset) - var(--bi-anchor-inset,0px));
}
@media (max-width: 768px) { :root { --bi-anchor-offset: 76px; } }
body { font-family: var(--bi-font); color: var(--bi-ink); }
body :is(button, input, select, textarea) { font-family: inherit; }
::selection { color: #fff; background: #6d36d9; }
:where(input,textarea) { caret-color: var(--bi-accent); }
:where(a,button,input,select,textarea,summary):focus-visible { outline: 3px solid var(--bi-focus); outline-offset: 4px; }
:where(a) { text-underline-offset: .2em; }
:where(button:disabled,input:disabled) { cursor: not-allowed; }
.bim-ui-button { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 48px; padding: 12px 24px; background: var(--bi-accent); border: 1px solid transparent; border-radius: var(--bi-radius-control); color: #fff; font: 650 15px/1.4 var(--bi-font); text-decoration: none; cursor: pointer; transition: background-color .18s; }
.bim-ui-button:hover { background: var(--bi-accent-hover); color: #fff; }
.bim-ui-button--secondary { background: var(--bi-surface); border-color: var(--bi-line); color: var(--bi-ink); }
.bim-ui-button--secondary:hover { background: var(--bi-accent-soft); color: var(--bi-ink); }
.bim-ui-button--ghost { background: transparent; color: var(--bi-accent); }
.bim-ui-button:disabled { opacity: .5; }
.bim-ui-badge { display: inline-flex; padding: 4px 8px; border-radius: 6px; background: var(--bi-accent-soft); color: var(--bi-accent); font-size: 12px; font-weight: 650; }
.bim-ui-card { padding: var(--bi-space-6); border: 1px solid var(--bi-line); border-radius: var(--bi-radius-card); background: var(--bi-surface); }
.bim-ui-alert { padding: 16px 20px; border: 1px solid var(--bi-line); border-radius: 10px; background: var(--bi-accent-soft); color: var(--bi-ink); line-height: 1.6; }
.bim-skip-link { position: fixed; left: 16px; top: -100px; z-index: 100001; padding: 12px 20px; border-radius: 8px; background: #fff; color: var(--bi-accent); }
.bim-skip-link:focus { top: 12px; }