/* Hallmark · macrostructure: Split Statement (login) · tone: technical-editorial · anchor hue: 40 */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html, body { overflow-x: clip; }
body {
  font-family: var(--font-body); color: var(--color-ink); background: var(--color-paper);
  -webkit-font-smoothing: antialiased; line-height: 1.55;
}
a { color: var(--color-ink); }

.login { min-height: 100dvh; display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); }

.login-brand {
  position: relative; overflow: hidden; background: var(--color-paper-2); border-right: var(--rule-1);
  padding: var(--space-10) clamp(var(--space-6), 6vw, var(--space-16));
  display: flex; flex-direction: column; justify-content: center; gap: var(--space-6);
}
.wordmark {
  position: absolute; top: var(--space-8); left: clamp(var(--space-6), 6vw, var(--space-16));
  display: inline-flex; align-items: center; gap: var(--space-2); text-decoration: none;
  font-family: var(--font-display); font-weight: 700; font-size: var(--text-lg); letter-spacing: -0.01em;
}
.login-statement {
  font-family: var(--font-display); font-weight: 600; font-size: var(--text-display);
  line-height: 1.04; letter-spacing: -0.03em; max-width: 13ch; position: relative; z-index: 1;
  overflow-wrap: anywhere; min-width: 0;
}
.u-grad {
  background: var(--grad); -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.login-sub { color: var(--color-ink-2); max-width: 38ch; font-size: var(--text-lg); position: relative; z-index: 1; }
.tree {
  position: absolute; right: -14%; bottom: -30%; width: min(40vw, 460px); height: auto;
  stroke: var(--color-rule-2); pointer-events: none;
}

.login-panel { display: grid; place-items: center; padding: var(--space-10) var(--space-6); }
.login-form { width: 100%; max-width: 360px; display: flex; flex-direction: column; gap: var(--space-4); }
.login-kicker { font-family: var(--font-mono); font-size: var(--text-xs); color: var(--color-brand-ink); letter-spacing: 0.04em; }
.login-title { font-family: var(--font-display); font-weight: 600; font-size: var(--text-xl); letter-spacing: -0.02em; margin-bottom: var(--space-2); }

.field { display: flex; flex-direction: column; gap: var(--space-1); font-size: var(--text-sm); font-weight: 500; color: var(--color-ink-2); }
.field input {
  font: inherit; font-size: var(--text-md); font-weight: 400; color: var(--color-ink);
  padding: 11px var(--space-3); border: 1px solid var(--color-rule-2); border-radius: var(--radius-sm);
  background: var(--color-paper);
  transition: border-color var(--dur-fast) var(--ease-out);
}
.field input:hover { border-color: var(--color-muted); }
.field input:focus-visible { outline: 2px solid var(--color-focus); outline-offset: 1px; border-color: var(--color-ink); }
.field input[aria-invalid="true"] { border-color: var(--color-danger); }

.form-error { font-size: var(--text-sm); color: var(--color-danger); }
.form-note { font-size: var(--text-sm); color: var(--color-ink-2); }

.btn-primary {
  font: inherit; font-weight: 600; font-size: var(--text-md); white-space: nowrap;
  background: var(--color-ink); color: var(--color-on-ink); border: 0; border-radius: var(--radius-sm);
  padding: 12px var(--space-4); cursor: pointer; margin-top: var(--space-2);
  transition: background-color var(--dur-fast) var(--ease-out), transform var(--dur-fast) var(--ease-out);
}
.btn-primary:hover { background: var(--color-ink-2); }
.btn-primary:active { transform: translateY(1px); }
.btn-primary:focus-visible { outline: 2px solid var(--color-focus); outline-offset: 2px; }
.btn-primary:disabled { opacity: 0.55; cursor: not-allowed; }
.btn-primary[data-state="loading"] .btn-label::after { content: "…"; }

.link-btn {
  align-self: flex-start; font: inherit; font-size: var(--text-sm); color: var(--color-ink-2);
  background: none; border: 0; padding: 0; cursor: pointer; text-decoration: underline; text-underline-offset: 3px;
}
.link-btn:hover { color: var(--color-ink); }
.link-btn:focus-visible { outline: 2px solid var(--color-focus); outline-offset: 2px; border-radius: 2px; }
.login-foot { font-size: var(--text-sm); color: var(--color-muted); margin-top: var(--space-6); }
.login-legal { font-size: var(--text-xs); color: var(--color-muted); text-align: center; }
.login-legal a { color: inherit; text-decoration: underline; text-underline-offset: 2px; }
.login-legal a:hover { color: var(--color-ink); }

@media (max-width: 820px) {
  .login { grid-template-columns: minmax(0, 1fr); }
  .login-brand { min-height: 42dvh; border-right: 0; border-bottom: var(--rule-1); padding-top: var(--space-16); }
  .tree { width: 60vw; right: -10%; bottom: -20%; }
}

/* the invitation link's own screen (login.js): the form and it take turns */
[hidden] { display: none !important; }
a.btn-primary { display: block; text-align: center; text-decoration: none; }

/* Sign in / Sign up switch (signup.js); the invitation link's screen stands alone */
.auth { width: 100%; max-width: 360px; display: flex; flex-direction: column; gap: var(--space-6); }
.auth-tabs { display: grid; grid-template-columns: 1fr 1fr; padding: 3px; gap: 3px; background: var(--color-paper-3); border-radius: var(--radius-sm); }
.auth-tab {
  font: inherit; font-size: var(--text-sm); font-weight: 600; color: var(--color-ink-2); background: none; border: 0;
  padding: 8px var(--space-3); border-radius: calc(var(--radius-sm) - 2px); cursor: pointer;
  transition: background-color var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out);
}
.auth-tab[aria-selected="true"] { background: var(--color-paper); color: var(--color-ink); box-shadow: 0 1px 2px oklch(17% 0.006 285 / 0.12); }
.auth-tab:focus-visible { outline: 2px solid var(--color-focus); outline-offset: 1px; }
.auth:has(#link-state:not([hidden])) .auth-tabs { display: none; }
.login-foot .link-btn { font-size: inherit; }

/* What Ipsion is, and the three role demos (the same clips as /alpha); the sign-up form carries the 1:28 walk-through */
.login-what { color: var(--color-ink-2); max-width: 46ch; font-size: var(--text-md); position: relative; z-index: 1; }
.demos { display: flex; flex-direction: column; gap: var(--space-2); position: relative; z-index: 1; max-width: 640px; }
.demo-strip { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--space-3); }
.demo { display: flex; flex-direction: column; gap: var(--space-1); min-width: 0; }
.demo video { width: 100%; height: auto; aspect-ratio: 16 / 9; border-radius: var(--radius-sm); background: var(--color-ink); border: var(--rule-1); }
.demo figcaption { font-size: var(--text-xs); color: var(--color-ink-2); }
@media (max-width: 520px) {
  .demo-strip { grid-template-columns: none; grid-auto-flow: column; grid-auto-columns: 72%; overflow-x: auto; scroll-snap-type: x mandatory; padding-bottom: var(--space-1); }
  .demo-strip .demo { scroll-snap-align: start; }
}