:root {
    --public-bg: #f6f8fb;
    --public-surface: #ffffff;
    --public-surface-muted: #f8fafc;
    --public-text: #172033;
    --public-muted: #657087;
    --public-subtle: #8793a8;
    --public-border: #dce3ee;
    --public-accent: #155eef;
    --public-accent-soft: #edf4ff;
    --public-success: #1f9d68;
    --public-code: #132238;
}

* { box-sizing: border-box; }
html { background: var(--public-bg); scroll-behavior: smooth; }
body { margin: 0; color: var(--public-text); background: var(--public-bg); font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; -webkit-font-smoothing: antialiased; }
a { color: var(--public-accent); text-decoration: none; }
a:hover { color: #0d4fd7; }
button, input, select, textarea { font: inherit; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }

/* Shared public navigation */
.public-doc-shell, .landing-shell, .landing-nav { width: min(100% - 48px, 1180px); margin-inline: auto; }
.public-doc-header, .landing-nav { display: flex; align-items: center; justify-content: space-between; gap: 24px; min-height: 76px; }
.public-doc-header { width: min(100% - 48px, 1180px); margin-inline: auto; border-bottom: 1px solid var(--public-border); }
.public-brand, .auth-brand { display: inline-flex; align-items: center; gap: 10px; color: var(--public-text); font-weight: 800; letter-spacing: -.03em; }
.public-brand img, .auth-brand img { width: 32px; height: 32px; object-fit: contain; }
.public-brand small { display: block; margin-top: 2px; color: var(--public-subtle); font-size: .69rem; font-weight: 700; letter-spacing: .02em; }
.public-doc-nav, .landing-nav nav, .landing-footer span:last-child { display: flex; align-items: center; gap: 22px; }
.public-doc-nav a, .landing-nav nav a:not(.button-link), .landing-footer a { color: #536078; font-size: .83rem; font-weight: 650; }
.public-doc-nav a[aria-current="page"] { color: var(--public-accent); }
.public-doc-nav .public-doc-cta, .button-link { display: inline-flex; align-items: center; justify-content: center; min-height: 40px; padding: 0 15px; border: 1px solid var(--public-border); border-radius: 9px; background: var(--public-surface); color: #536078; font-size: .8rem; font-weight: 750; }
.public-doc-nav .public-doc-cta, .landing-primary { border-color: var(--public-accent); background: var(--public-accent); color: #fff !important; box-shadow: 0 8px 18px rgba(21, 94, 239, .16); }
.public-doc-nav .public-doc-cta:hover, .landing-primary:hover { background: #0d4fd7; color: #fff; }

/* Public landing page */
.landing-page { background: var(--public-bg); color: var(--public-text); }
.landing-page .landing-nav { width: min(100% - 48px, 1180px); }
.landing-page .landing-nav nav a:not(.button-link) { color: #536078; }
.landing-page .landing-nav nav a:not(.button-link):hover { color: var(--public-accent); }
.landing-shell { padding: 0 0 76px; }
.landing-hero { display: grid; grid-template-columns: minmax(0, .93fr) minmax(360px, 1.07fr); align-items: center; gap: 72px; padding: 104px 0 112px; }
.landing-eyebrow { margin: 0 0 17px; color: var(--public-accent); font-size: .72rem; font-weight: 850; letter-spacing: .13em; text-transform: uppercase; }
.landing-hero h1 { max-width: 680px; margin: 0; color: var(--public-text); font-family: "Avenir Next", "SF Pro Display", "Segoe UI", sans-serif; font-size: clamp(3rem, 6.2vw, 6rem); font-weight: 800; line-height: .98; letter-spacing: -.075em; }
.landing-hero-copy > p:not(.landing-eyebrow) { max-width: 590px; margin: 26px 0 0; color: var(--public-muted); font-size: 1.08rem; line-height: 1.7; }
.landing-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
.landing-actions > .button-link:not(.landing-primary) { background: transparent; }
.landing-note { margin-top: 16px !important; color: var(--public-subtle) !important; font-size: .82rem !important; }
.landing-visual { position: relative; }
.visual-window { overflow: hidden; border: 1px solid #cfdbea; border-radius: 22px; background: var(--public-surface); box-shadow: 0 28px 70px rgba(29, 62, 110, .12); transform: rotate(1.2deg); }
.visual-bar { display: flex; align-items: center; gap: 7px; padding: 16px; border-bottom: 1px solid #e6ebf2; color: var(--public-subtle); }
.visual-bar span { width: 8px; height: 8px; border-radius: 50%; background: #c8d2e1; }
.visual-bar b { margin-left: 12px; color: #647188; font-size: .7rem; letter-spacing: .08em; text-transform: uppercase; }
.visual-body { display: grid; grid-template-columns: 62px 1fr; min-height: 340px; }
.visual-sidebar { display: grid; align-content: start; gap: 18px; padding: 22px 20px; border-right: 1px solid #e8edf4; }
.visual-sidebar i { width: 20px; height: 4px; border-radius: 99px; background: #d8e0eb; }
.visual-sidebar i:first-child, .visual-sidebar-active { background: #7ea9f4 !important; }
.visual-content { padding: 30px; }
.visual-content small { color: var(--public-subtle); font-size: .66rem; letter-spacing: .14em; }
.visual-content > strong { display: block; margin: 18px 0 24px; color: var(--public-text); font-size: 1.7rem; letter-spacing: -.04em; }
.visual-post { display: grid; grid-template-columns: 10px 1fr auto; align-items: center; gap: 11px; margin-top: 14px; padding: 13px 0; border-top: 1px solid #e8edf4; }
.visual-post b { display: block; color: var(--public-text); font-size: .78rem; }
.visual-post small { display: block; margin-top: 4px; color: var(--public-subtle); font-size: .65rem; letter-spacing: 0; text-transform: none; }
.visual-post em { color: var(--public-accent); font-size: .63rem; font-style: normal; font-weight: 850; text-transform: uppercase; }
.visual-post-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--public-accent); box-shadow: 0 0 0 4px var(--public-accent-soft); }
.visual-post-dot-mint { background: var(--public-success); box-shadow: 0 0 0 4px #e7f7ef; }
.landing-proof { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 18px; padding: 20px 0; border-top: 1px solid var(--public-border); border-bottom: 1px solid var(--public-border); color: #758299; font-size: .76rem; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; }
.landing-developer, .landing-inbox { display: grid; grid-template-columns: minmax(0, .86fr) minmax(0, 1.14fr); align-items: center; gap: 72px; padding: 96px 0; border-bottom: 1px solid var(--public-border); }
.landing-developer-intro h2, .landing-section-intro h2, .landing-inbox h2, .landing-cta h2 { max-width: 650px; margin: 0; color: var(--public-text); font-family: "Avenir Next", "SF Pro Display", "Segoe UI", sans-serif; font-size: clamp(2.2rem, 4vw, 4rem); font-weight: 800; line-height: 1; letter-spacing: -.06em; }
.landing-developer-intro > p:last-child, .landing-inbox-copy > p:not(.landing-eyebrow), .landing-section-intro > p:last-child, .landing-feature-list p, .landing-steps p, .landing-band-points p, .landing-section-lead { color: var(--public-muted); line-height: 1.65; }
.landing-developer-intro > p:last-child { max-width: 470px; margin: 22px 0 0; }
.landing-developer-links { display: grid; gap: 12px; }
.landing-developer-card { display: grid; grid-template-columns: 46px 1fr; gap: 16px; align-items: start; padding: 22px; border: 1px solid var(--public-border); border-radius: 16px; background: var(--public-surface); color: var(--public-text); box-shadow: 0 8px 22px rgba(31, 52, 83, .045); transition: border-color .2s ease, transform .2s ease, box-shadow .2s ease; }
.landing-developer-card:hover { border-color: #9bb9f5; box-shadow: 0 12px 26px rgba(31, 75, 150, .09); transform: translateY(-2px); }
.landing-developer-card b { display: block; font-size: 1.08rem; }
.landing-developer-card small { display: block; margin-top: 7px; color: var(--public-muted); font-size: .86rem; line-height: 1.55; }
.landing-developer-card strong { display: block; margin-top: 14px; color: var(--public-accent); font-size: .8rem; }
.landing-developer-card strong span { margin-left: 6px; }
.landing-developer-icon { display: grid; place-items: center; width: 42px; height: 42px; border-radius: 12px; background: var(--public-accent-soft); color: var(--public-accent); font-size: 1.3rem; font-weight: 800; }
.landing-developer-icon-api { background: #e8f7f2; color: #16805d; font-size: .85rem; letter-spacing: -.08em; }
.landing-inbox { grid-template-columns: minmax(0, 1fr) minmax(360px, .95fr); }
.landing-inbox-copy > p:not(.landing-eyebrow) { max-width: 560px; margin: 22px 0 0; }
.landing-inbox-copy .button-link { margin-top: 28px; }
.landing-inbox-panel { display: grid; gap: 12px; padding: 20px; border: 1px solid #cfdbea; border-radius: 20px; background: var(--public-surface); box-shadow: 0 24px 60px rgba(29, 62, 110, .09); }
.landing-inbox-panel > div { display: flex; align-items: center; gap: 10px; padding: 4px 4px 12px; color: #647188; }
.inbox-panel-label { color: var(--public-accent); font-size: .68rem; font-weight: 850; letter-spacing: .14em; }
.inbox-count { margin-left: auto; padding: 5px 9px; border-radius: 999px; background: var(--public-accent-soft); color: var(--public-accent); font-size: .72rem; font-weight: 800; }
.landing-inbox-panel article { display: grid; grid-template-columns: 32px 1fr auto; align-items: center; gap: 12px; padding: 14px; border: 1px solid #e2e8f1; border-radius: 12px; background: var(--public-surface-muted); }
.landing-inbox-panel article b { color: var(--public-text); }
.landing-inbox-panel article p { margin: 4px 0 0; color: var(--public-subtle); font-size: .78rem; }
.landing-inbox-panel article em { padding: 5px 8px; border-radius: 999px; background: #eaf1ff; color: var(--public-accent); font-size: .68rem; font-style: normal; font-weight: 800; white-space: nowrap; }
.inbox-channel { display: grid; place-items: center; width: 30px; height: 30px; border-radius: 9px; background: #f1eaff; color: #7553cb; font-size: .7rem; font-weight: 900; }
.inbox-channel-blue { background: #e4f0ff; color: #236bbf; }
.inbox-channel-mint { background: #e3f7ef; color: #16805d; }
.landing-section { display: grid; gap: 48px; padding: 112px 0; }
.landing-section-intro { display: grid; grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr); column-gap: 60px; align-items: end; }
.landing-section-intro .landing-eyebrow { grid-column: 1 / -1; }
.landing-section-intro > p:last-child { max-width: 390px; margin: 0 0 4px; }
.landing-feature-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0 54px; }
.landing-feature-list article { display: grid; grid-template-columns: 34px 1fr; gap: 16px; padding: 28px 0; border-top: 1px solid var(--public-border); }
.landing-feature-list article > span, .landing-steps b { color: var(--public-accent); font-size: .78rem; font-weight: 850; letter-spacing: .1em; }
.landing-feature-list h3, .landing-steps h3 { margin: 0 0 9px; color: var(--public-text); font-size: 1.22rem; letter-spacing: -.02em; }
.landing-feature-list a { display: inline-flex; gap: 8px; margin-top: 15px; color: var(--public-accent); font-size: .82rem; font-weight: 800; }
.landing-band { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr); gap: 80px; padding: 78px 0; border-top: 1px solid var(--public-border); border-bottom: 1px solid var(--public-border); }
.landing-band h2 { max-width: 520px; margin: 0; color: var(--public-text); font-size: clamp(2.1rem, 4vw, 3.5rem); line-height: 1; letter-spacing: -.055em; }
.landing-band-points { display: grid; gap: 20px; }
.landing-band-points p { margin: 0; padding-left: 20px; border-left: 2px solid var(--public-accent); }
.landing-band-points b { display: block; margin-bottom: 4px; color: var(--public-text); }
.landing-steps { display: grid; gap: 0; margin: 0; padding: 0; list-style: none; }
.landing-steps li { display: grid; grid-template-columns: 52px 1fr; gap: 18px; padding: 0 0 28px; margin-bottom: 28px; border-bottom: 1px solid var(--public-border); }
.landing-cta { display: grid; justify-items: center; gap: 16px; padding: 108px 24px; border-top: 1px solid var(--public-border); text-align: center; }
.landing-cta p { margin: 0; color: var(--public-muted); }
.landing-footer { display: flex; justify-content: space-between; gap: 18px; width: min(100% - 48px, 1180px); margin: 0 auto; padding: 24px 0 40px; color: var(--public-subtle); font-size: .8rem; }

/* Unified Help Center / MCP / API documentation */
.public-doc-page { background: var(--public-bg); }
.public-doc-main { width: min(100% - 48px, 1180px); margin: 0 auto; padding: 66px 0 92px; }
.help-center-hero { max-width: 820px; padding-bottom: 48px; }
.help-center-eyebrow, .help-center-kicker, .docs-kicker { margin: 0 0 12px; color: var(--public-accent); font-size: .7rem; font-weight: 850; letter-spacing: .13em; text-transform: uppercase; }
.help-center-hero h1, .docs-hero h1 { max-width: 780px; margin: 0; color: var(--public-text); font-family: "Avenir Next", "SF Pro Display", "Segoe UI", sans-serif; font-size: clamp(2.5rem, 5vw, 4.7rem); font-weight: 800; line-height: .99; letter-spacing: -.065em; }
.help-center-hero > p:not(.help-center-eyebrow):not(.help-center-search-result), .docs-hero .docs-lead { max-width: 700px; margin: 22px 0 0; color: var(--public-muted); font-size: 1.08rem; line-height: 1.7; }
.help-center-search { display: flex; gap: 10px; max-width: 720px; margin-top: 28px; }
.help-center-search input { flex: 1; min-width: 0; min-height: 48px; padding: 0 16px; border: 1px solid var(--public-border); border-radius: 10px; background: #fff; color: var(--public-text); box-shadow: 0 8px 20px rgba(34, 70, 99, .06); }
.help-center-search button { min-height: 48px; padding: 0 20px; border: 1px solid var(--public-accent); border-radius: 10px; background: var(--public-accent); color: #fff; font-weight: 800; cursor: pointer; }
.help-center-search-result { color: var(--public-muted); font-size: .88rem; }
.help-center-layout { display: grid; grid-template-columns: 200px minmax(0, 1fr); gap: 58px; align-items: start; }
.help-center-toc { position: sticky; top: 22px; display: grid; gap: 4px; padding-right: 18px; }
.help-center-toc-title { margin: 0 0 10px; color: var(--public-text); font-size: .74rem; font-weight: 850; letter-spacing: .1em; text-transform: uppercase; }
.help-center-toc a { padding: 8px 10px; border-radius: 8px; color: #617087; font-size: .84rem; }
.help-center-toc a:hover, .help-center-toc a:focus-visible { background: var(--public-accent-soft); color: var(--public-accent); outline: 0; }
.help-center-content { min-width: 0; }
.help-center-section { padding: 0 0 54px; margin-bottom: 54px; border-bottom: 1px solid var(--public-border); scroll-margin-top: 24px; }
.help-center-section-heading { display: flex; justify-content: space-between; gap: 32px; align-items: end; margin-bottom: 22px; }
.help-center-section-heading h2 { margin: 0; color: var(--public-text); font-size: 1.65rem; letter-spacing: -.04em; }
.help-center-section-heading > p { max-width: 360px; margin: 0; color: var(--public-muted); font-size: .88rem; line-height: 1.55; text-align: right; }
.help-guide-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.help-guide, .help-article-link, .help-center-link-card { padding: 21px; border: 1px solid var(--public-border); border-radius: 14px; background: rgba(255,255,255,.86); box-shadow: 0 8px 22px rgba(31, 52, 83, .04); }
.help-guide { transition: border-color .2s ease, transform .2s ease, box-shadow .2s ease; }
.help-guide-link { display: block; color: var(--public-text); }
.help-guide h3 { margin: 0 0 9px; color: var(--public-text); font-size: 1.02rem; }
.help-guide p { margin: 0; color: var(--public-muted); line-height: 1.55; }
.help-guide-read-more { display: block; margin-top: 17px; color: var(--public-accent); font-size: .82rem; font-weight: 800; }
.help-guide:hover, .help-guide:focus-visible, .help-article-link:hover, .help-article-link:focus-visible, .help-center-link-card:hover { border-color: #9bb9f5; box-shadow: 0 12px 26px rgba(31, 75, 150, .09); outline: 0; transform: translateY(-2px); }
.help-article-list { display: grid; gap: 10px; }
.help-article-link { display: flex; align-items: center; justify-content: space-between; gap: 16px; color: var(--public-text); }
.help-article-link span:first-child { display: grid; gap: 5px; }
.help-article-link small { color: var(--public-subtle); }
.help-article-link > span:last-child { color: var(--public-accent); font-size: 1.2rem; }
.help-center-link-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; margin: 0 0 54px; }
.help-center-link-card { display: block; color: var(--public-text); }
.help-center-link-card strong { display: block; font-size: 1rem; }
.help-center-link-card p { margin: 8px 0 0; color: var(--public-muted); font-size: .88rem; line-height: 1.5; }
.help-center-link-card span { display: block; margin-top: 16px; color: var(--public-accent); font-size: .82rem; font-weight: 800; }
.help-center-empty { padding: 32px 0; color: var(--public-muted); }

.docs-page .public-doc-main { padding-top: 54px; }
.docs-hero { max-width: 820px; padding-bottom: 42px; }
.docs-layout { display: grid; grid-template-columns: 200px minmax(0, 760px); gap: 58px; align-items: start; }
.docs-sidebar { position: sticky; top: 22px; display: grid; gap: 5px; padding-right: 18px; }
.docs-sidebar strong { margin-bottom: 8px; color: var(--public-text); font-size: .75rem; letter-spacing: .08em; text-transform: uppercase; }
.docs-sidebar a { padding: 7px 9px; border-radius: 8px; color: #617087; font-size: .84rem; }
.docs-sidebar a:hover { background: var(--public-accent-soft); color: var(--public-accent); }
.docs-content { min-width: 0; }
.docs-content h2 { padding-top: 28px; margin: 40px 0 14px; border-top: 1px solid var(--public-border); color: var(--public-text); font-size: 1.55rem; letter-spacing: -.035em; scroll-margin-top: 24px; }
.docs-content h2:first-of-type { margin-top: 0; }
.docs-content p, .docs-content li { color: #46566d; line-height: 1.7; }
.docs-content code { padding: 2px 5px; border-radius: 5px; background: #eaf0f7; color: #29476d; font: .88em ui-monospace, SFMono-Regular, Menlo, monospace; }
.docs-code { overflow: auto; padding: 16px 18px; border: 1px solid #223a5b; border-radius: 10px; background: var(--public-code); color: #e7efff; font: 13px/1.6 ui-monospace, SFMono-Regular, Menlo, monospace; white-space: pre-wrap; }
.docs-note { padding: 14px 17px; border: 1px solid #c4dcff; border-left: 4px solid var(--public-accent); border-radius: 8px; background: #f0f6ff; color: #3e5774; }
.docs-card-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.docs-card { padding: 22px; border: 1px solid var(--public-border); border-radius: 14px; background: #fff; box-shadow: 0 8px 22px rgba(31, 52, 83, .04); }
.docs-card h2 { padding: 0; margin: 0 0 16px; border: 0; font-size: 1.1rem; }
.docs-step { display: flex; gap: 13px; margin: 17px 0; }
.docs-step-number { display: grid; place-items: center; flex: 0 0 28px; height: 28px; border-radius: 50%; background: var(--public-accent-soft); color: var(--public-accent); font-weight: 800; }
.docs-muted { color: var(--public-muted); }
.docs-footer { margin-top: 42px; color: var(--public-muted); font-size: .88rem; }
.help-article-page { max-width: 820px; }
.help-article-detail { max-width: 760px; padding: 14px 0 44px; }
.help-article-detail h1 { margin: 0; color: var(--public-text); font-family: "Avenir Next", "SF Pro Display", "Segoe UI", sans-serif; font-size: clamp(2.4rem, 5vw, 4.5rem); line-height: 1; letter-spacing: -.06em; }
.help-article-summary { margin: 24px 0 0; color: var(--public-muted); font-size: 1.1rem; line-height: 1.65; }
.help-article-body { margin-top: 42px; padding: 28px; border: 1px solid var(--public-border); border-radius: 16px; background: #fff; box-shadow: 0 10px 24px rgba(40, 72, 98, .045); }
.help-article-body h2 { margin: 0; color: var(--public-text); font-size: 1.15rem; }
.help-article-body ol { display: grid; gap: 16px; margin: 22px 0 0; padding-left: 24px; color: #30475c; line-height: 1.6; }
.help-article-body li::marker { color: var(--public-accent); font-weight: 800; }
.help-article-footer { margin: 0; font-weight: 800; }

@media (max-width: 820px) {
    .landing-hero, .landing-developer, .landing-inbox, .landing-section-intro, .landing-band { grid-template-columns: 1fr; gap: 42px; }
    .landing-hero { padding: 78px 0 90px; }
    .landing-feature-list, .help-guide-list, .help-center-link-grid, .docs-card-grid { grid-template-columns: 1fr; }
    .landing-section { padding: 78px 0; }
    .help-center-layout, .docs-layout { display: block; }
    .help-center-toc, .docs-sidebar { position: static; display: flex; gap: 7px; overflow-x: auto; margin: 0 0 42px; padding: 0 0 7px; white-space: nowrap; }
    .help-center-toc-title, .docs-sidebar strong { display: none; }
    .help-center-section-heading { display: block; }
    .help-center-section-heading > p { margin-top: 12px; text-align: left; }
}
@media (max-width: 620px) {
    .public-doc-shell, .landing-shell, .landing-nav, .public-doc-header, .public-doc-main { width: min(100% - 28px, 1180px); }
    .public-doc-header, .landing-nav { align-items: flex-start; flex-direction: column; padding: 14px 0; }
    .public-doc-nav, .landing-nav nav { width: 100%; gap: 14px; overflow-x: auto; padding-bottom: 2px; }
    .public-doc-nav a, .landing-nav nav a:not(.button-link) { flex: 0 0 auto; }
    .landing-page .landing-nav nav a[href="#social-inbox"] { display: none; }
    .landing-hero h1 { font-size: clamp(3rem, 15vw, 4.8rem); }
    .visual-body { grid-template-columns: 48px 1fr; }
    .visual-sidebar { padding-inline: 14px; }
    .visual-content { padding: 22px 18px; }
    .visual-content > strong { font-size: 1.35rem; }
    .landing-inbox-panel article { grid-template-columns: 30px 1fr; }
    .landing-inbox-panel article em { grid-column: 2; justify-self: start; }
    .help-center-search { display: grid; grid-template-columns: 1fr; }
    .help-center-search button { width: 100%; }
    .landing-footer { width: min(100% - 28px, 1180px); align-items: flex-start; flex-direction: column; }
}