:root {
  background: var(--bg);
  color: var(--text);
  font: 14px/1.75 var(--mono);
  scrollbar-color: var(--scrollbar-thumb) var(--scrollbar-track);
}

*, *::before, *::after { box-sizing: border-box; }
body { margin: 0; min-height: 100dvh; padding: 80px 28px; }
::selection { background: var(--green); color: var(--bg); }
a { color: var(--green); text-decoration: none; text-underline-offset: 4px; }
a:hover { text-decoration: underline; }
:focus-visible { outline: 2px solid var(--green); outline-offset: 5px; }
.signin-selection { padding: 18px; border: 1px solid var(--green-dark); background: var(--bg-code); margin: 24px 0; }
.signin-selection strong { color: var(--green); }
.signin-selection p { margin: 8px 0; }
.signin-selection span { font-size: 12px; color: var(--muted); }
.signin-error { padding: 14px 16px; border-left: 2px solid #ffadad; background: var(--bg-code); color: #ffadad; }
#signin-code { letter-spacing: .2em; font-size: 21px; }
.signin-form .signin-fine { margin: 10px 0 18px; }
main { width: 100%; max-width: 720px; margin: 0 auto; }
.brand { display: inline-flex; align-items: center; gap: 12px; font-weight: 700; letter-spacing: .04em; }
.brand span { color: var(--green); }
body:not(.invite-page) .brand { margin-bottom: 48px; }
.eyebrow { margin: 0 0 18px; color: var(--muted); font-size: 12px; }
h1 { margin: 0 0 20px; color: var(--green); font-size: clamp(30px, 5vw, 44px); font-weight: 700; line-height: 1.2; letter-spacing: -.045em; }
p { margin: 0 0 24px; }
.actions { display: flex; align-items: center; flex-wrap: wrap; gap: 20px; margin: 32px 0; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 20px; min-height: 46px; padding: 10px 18px; border: 1px solid var(--green-dim); border-radius: 0; background: transparent; color: var(--green); font: inherit; font-size: 13px; font-weight: 700; cursor: pointer; }
.button:hover { border-color: var(--green); background: var(--bg-code); color: var(--green); text-decoration: none; }
.button.secondary { border-color: var(--border); color: var(--muted); }
.button.secondary:hover { border-color: var(--green-dim); color: var(--green); }
.note { margin: 0; color: var(--muted); font-size: 12px; overflow-wrap: anywhere; }
.signin-form { display: grid; gap: 12px; max-width: 480px; margin: 32px 0 20px; }
.signin-form label { color: var(--heading); font-weight: 700; }
.signin-form input { width: 100%; min-height: 52px; padding: 12px 14px; border: 1px solid var(--border); border-radius: 0; background: var(--bg-code); color: var(--heading); font: inherit; font-size: 16px; }
.signin-form .button { min-height: 50px; }
#passkey-signin-button { margin-bottom: 16px; }
.signin-fine { max-width: 540px; color: var(--muted); font-size: 12px; }

/* The invite page follows the blog's masthead and open article layout. */
.invite-page { display: flex; flex-direction: column; padding: 0; }
.auth-header { border-bottom: 1px solid var(--border); }
.auth-header-inner, .auth-footer-inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; width: min(100% - 56px, 852px); margin: 0 auto; }
.auth-header-inner { min-height: 88px; }
.auth-header .brand { font-size: 16px; }
.auth-header .brand::after { content: ''; width: 8px; height: 17px; margin-left: -6px; background: var(--green); }
.blog-link { color: var(--muted); font-size: 12px; white-space: nowrap; }
.blog-link:hover { color: var(--green); }
.invite-main { flex: 1; width: min(100% - 56px, 720px); padding: clamp(56px, 9vh, 88px) 0 64px; }
.invite-form { margin: 36px 0 0; padding: 28px 0 32px; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.invite-form label { display: block; margin-bottom: 12px; color: var(--heading); font-size: 13px; font-weight: 700; }
.code-entry { display: flex; align-items: center; gap: 14px; border-left: 2px solid var(--green-dim); border-bottom: 1px solid var(--green-dark); background: var(--bg-code); padding: 0 16px; }
.code-prompt { color: var(--green); font-size: 18px; }
.code-entry:focus-within { border-color: var(--green); outline: 1px solid var(--green); outline-offset: 3px; }
.code-entry input { width: 100%; min-width: 0; min-height: 56px; padding: 14px 0; border: 0; border-radius: 0; outline: none; background: transparent; color: var(--heading); font: inherit; font-size: 16px; caret-color: var(--green); }
.code-entry input::placeholder { color: var(--muted); opacity: 1; font-size: 13px; }
.invite-help { margin: 14px 0 24px; color: var(--muted); font-size: 12px; }
.invite-error { margin: 14px 0 0; color: #ffadad; font-size: 13px; }
.code-entry:has([aria-invalid="true"]) { border-color: #ffadad; }
.invite-request { margin: 24px 0 0; color: var(--muted); font-size: 12px; }
.invite-request a { display: inline-block; overflow-wrap: anywhere; }
.auth-footer { border-top: 1px solid var(--border); }
.auth-footer-inner { min-height: 78px; color: var(--muted); font-size: 11px; }
.auth-footer nav { display: flex; gap: 24px; }
.auth-footer a { color: var(--muted); }
.auth-footer a:hover { color: var(--green); }

@media (max-width: 520px) {
  body { padding: 40px 22px; }
  .invite-page { padding: 0; }
  .auth-header-inner, .auth-footer-inner { width: calc(100% - 44px); gap: 16px; }
  .auth-header-inner { min-height: 74px; }
  .auth-header .brand { font-size: 13px; letter-spacing: 0; }
  .blog-link { font-size: 11px; }
  .invite-main { width: calc(100% - 44px); padding: 48px 0 64px; }
  .invite-form { margin-top: 28px; }
  .invite-form .button { width: 100%; justify-content: space-between; padding: 12px 14px; gap: 10px; }
  .auth-footer-inner { flex-wrap: wrap; padding: 20px 0; }
  .auth-footer nav { gap: 20px; }
  .actions { align-items: stretch; flex-direction: column; }
}

@media (forced-colors: active) {
  .code-entry:focus-within { outline-color: Highlight; }
  .code-entry input { outline: revert; }
}

/* Sign-in links and disclosures share the same mobile rhythm as the funnel. */
@media (max-width: 650px) {
  .invite-main { padding-block: 40px 48px; }
  .invite-main .button { width: 100%; max-width: 100%; min-height: 48px; gap: 10px; white-space: normal; overflow-wrap: anywhere; text-align: center; }
  .invite-main > form { margin: 24px 0 16px; }
  .signin-form { max-width: none; }
  .invite-main > a:not(.button), .invite-main .actions > a:not(.button), .invite-main > details > a:not(.button) { display: flex; align-items: center; min-height: 44px; padding-block: 8px; line-height: 1.6; }
  .invite-main > a:not(.button) { margin-block: 4px; }
  .invite-main > details { margin-top: 16px; padding: 0; border-top: 1px solid var(--border); }
  .invite-main > details > summary { min-height: 52px; padding-block: 14px; cursor: pointer; font-size: 13px; line-height: 1.6; }
  .invite-main > details > p { margin: 0 0 16px; font-size: 13px; color: var(--muted); }
  .invite-main > details > a { margin-bottom: 16px; }
  .invite-main .actions { align-items: stretch; flex-direction: column; gap: 8px; }
  .invite-main [role="alert"] { padding: 12px 14px; border-left: 2px solid #ffadad; background: var(--bg-code); color: #ffadad; font-size: 13px; overflow-wrap: anywhere; }
  .auth-header :is(.brand, .blog-link) { min-height: 44px; display: inline-flex; align-items: center; }
  .auth-footer-inner { gap: 8px 24px; }
  .auth-footer nav { flex-wrap: wrap; align-items: center; gap: 4px 20px; }
  .auth-footer nav :is(a, button) { display: inline-flex; align-items: center; min-height: 44px; }
  .auth-footer [data-pwa-install] { padding: 8px 0; border: 0; background: transparent; color: var(--muted); font-size: 11px; font-weight: 400; }
  .auth-footer [hidden] { display: none !important; }
}