/* whirlpool — login.
 *
 * This page is the seam between two visual languages: the marketing site
 * (Space Mono, ink on paper, hard edges) and the canvas (Inter, cards,
 * chrome). It takes the marketing site's, because it is the continuation of a
 * click that happened there. Tokens are copied from website/style.css rather
 * than shared, since the two are separate deploys with no build step between
 * them — if you change a colour there, change it here. */

:root {
  --cyan: #00c0e8;
  --ink: #000000;
  --paper: #ffffff;
  --muted: #6b6b6b;
  --error: #b00020;
  --mono: 'Necto Mono', 'Space Mono', ui-monospace, 'SFMono-Regular', Menlo, monospace;
  --edge: clamp(14px, 3.2vw, 36px);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  min-height: 100%;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--mono);
}

.chrome {
  position: fixed;
  top: var(--edge);
  left: var(--edge);
}

/* Mirrors website/style.css's .wordmark exactly, because this is the same
   wordmark: no weight and no tracking of its own, so it inherits 400 with
   default spacing the way the marketing site's does. color/text-decoration are
   here because it is an <a> - a link home, as it is on every marketing page. */
.wordmark {
  color: inherit;
  text-decoration: none;
  font-size: clamp(0.85rem, 2.2vw, 1.9rem);
  line-height: 1;
}

.login {
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  /* Vertical padding via padding-block so the horizontal gutter is never
     zeroed by a shorthand. */
  padding-inline: var(--edge);
  padding-block: calc(var(--edge) * 3);
}

/* Author styles beat the user-agent sheet, so `.step { display: flex }` would
   otherwise override the `display: none` that the hidden attribute relies on,
   and both steps would render at once. This has to come first and carry the
   !important, or `hidden` is decorative on any element given a display. */
[hidden] {
  display: none !important;
}

.step {
  width: 100%;
  max-width: 26rem;
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
  text-align: center;
}

.step__title {
  margin: 0;
  font-size: clamp(1.4rem, 4vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.step__lead {
  margin: 0;
  font-size: clamp(0.85rem, 1.5vw, 1.05rem);
  line-height: 1.5;
}

.step__aside {
  margin: 0;
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--muted);
}

.step__aside a,
.linkish {
  color: var(--muted);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.dot { margin: 0 .4em; }

/* A button that reads as a link: resend and change-number are actions, not
   navigation, so they must be buttons for a screen reader and the keyboard,
   but they should not compete with the real submit button. */
.linkish {
  padding: 0;
  border: 0;
  background: none;
  font: inherit;
  font-size: inherit;
  cursor: pointer;
}

.linkish:disabled {
  cursor: default;
  opacity: .5;
  text-decoration: none;
}

.field {
  display: flex;
  flex-direction: column;
  gap: .4rem;
  text-align: left;
}

.field__label {
  font-size: .75rem;
  text-transform: lowercase;
  letter-spacing: .04em;
  color: var(--muted);
}

.field__input {
  width: 100%;
  padding: .7em .8em;
  border: 1px solid var(--ink);
  border-radius: 6px; /* the 6px the marketing site's .btn established */
  background: none;
  color: var(--ink);
  font-family: var(--mono);
  font-size: 1rem; /* never below 16px: iOS zooms the viewport on a smaller one */
}

.field__input:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 1px;
}

/* The code is six characters read back one at a time, so it gets tracking and
   size the phone number does not need. */
.field__input--code {
  font-size: 1.5rem;
  letter-spacing: .5em;
  text-align: center;
  padding-inline: .4em;
}

.btn {
  padding: .7em .9em;
  border: 1px solid var(--ink);
  border-radius: 6px;
  background: none;
  color: var(--ink);
  font-family: var(--mono);
  font-size: 1rem;
  line-height: 1;
  cursor: pointer;
  transition: background-color .25s ease, border-color .25s ease, color .25s ease;
}

.btn:hover,
.btn:focus-visible {
  background: var(--cyan);
  color: var(--ink);
  border-color: transparent; /* transparent, not border:0, so the box keeps its size */
}

.btn:disabled {
  cursor: default;
  opacity: .45;
  background: none;
  border-color: var(--ink);
}

.error {
  max-width: 26rem;
  margin: 1.2rem 0 0;
  color: var(--error);
  font-size: .85rem;
  line-height: 1.5;
  text-align: center;
}

@media (prefers-reduced-motion: reduce) {
  .btn { transition: none; }
}