/* Sign-in page: one card on a light field with the brand's red and orange
   moving through it.

   Loaded only by login.html, so none of this is parsed on a working screen.
   Nothing here animates anything but transform, so the whole field
   composites on the GPU. */

.signin {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  display: grid;
  grid-template-rows: 1fr auto;
  justify-items: center;
  gap: var(--sp-6);
  padding: var(--sp-8) var(--sp-5);
  background: #F2F3F5;
}

/* ---- the field ----------------------------------------------------------
   Fixed rather than absolute, so a short window scrolls the card without
   the field scrolling out from behind it. */

.sky { position: fixed; inset: 0; overflow: hidden; pointer-events: none; }
.sky > * { position: absolute; }

/* The palette lives here and nowhere else, so the whole field can be
   re-coloured by changing these six lines. The card carries the brand red;
   the field is its quiet counterpart. */
:root {
  --sky-ground: linear-gradient(168deg, #FAFAFB 0%, #ECEEF3 52%, #F1F0F6 100%);
  --sky-a: radial-gradient(circle, rgba(64, 64, 126, .58) 0%, rgba(64, 64, 126, .22) 42%, transparent 70%);
  --sky-b: radial-gradient(circle, rgba(90, 107, 140, .62) 0%, rgba(64, 64, 126, .24) 44%, transparent 70%);
  --sky-c: radial-gradient(circle, rgba(122, 138, 168, .44) 0%, transparent 64%);
  --sky-d: radial-gradient(circle, rgba(44, 44, 92, .34) 0%, transparent 62%);
  --sky-e: radial-gradient(circle, rgba(245, 137, 32, .30) 0%, transparent 62%);
}

.sky-base {
  inset: 0;
  background:
    radial-gradient(120% 85% at 50% -12%, #FFFFFF 0%, transparent 58%),
    var(--sky-ground);
}

/* Large fields of brand colour, drifting and swelling past each other.

   Everything here is big on purpose. Earlier versions added a dot
   grid, travelling lines and rings spreading from the middle; each of those
   is a shape, and shapes on top of one another read as clutter. This is one
   field with no edge to it, drifting and turning. */
.sky-glow {
  inset: -30%;
  will-change: transform;
  animation: sky-turn 40s linear infinite;
}
@keyframes sky-turn {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}
.sky-glow i { position: absolute; border-radius: 50%; will-change: transform; }

.sky-glow i:nth-child(1) {
  width: 86vmax; height: 86vmax; left: -22%; top: -26%;
  background: var(--sky-a);
  animation: sky-drift-a 13s ease-in-out infinite;
}
.sky-glow i:nth-child(2) {
  width: 78vmax; height: 78vmax; right: -24%; bottom: -28%;
  background: var(--sky-b);
  animation: sky-drift-b 16s ease-in-out infinite;
}
.sky-glow i:nth-child(3) {
  width: 66vmax; height: 66vmax; left: 38%; top: 34%;
  background: var(--sky-c);
  animation: sky-drift-c 11s ease-in-out infinite;
}
.sky-glow i:nth-child(4) {
  width: 72vmax; height: 72vmax; right: -10%; top: -22%;
  background: var(--sky-d);
  animation: sky-drift-d 18s ease-in-out infinite;
}
.sky-glow i:nth-child(5) {
  width: 58vmax; height: 58vmax; left: -12%; bottom: -24%;
  background: var(--sky-e);
  animation: sky-drift-e 10s ease-in-out infinite;
}

@keyframes sky-drift-a {
  0%, 100% { transform: translate3d(0, 0, 0) scale(1); }
  50%      { transform: translate3d(22vw, 15vh, 0) scale(1.34); }
}
@keyframes sky-drift-b {
  0%, 100% { transform: translate3d(0, 0, 0) scale(1.24); }
  50%      { transform: translate3d(-23vw, -17vh, 0) scale(.96); }
}
@keyframes sky-drift-c {
  0%, 100% { transform: translate3d(-14vw, 10vh, 0) scale(.82); }
  50%      { transform: translate3d(15vw, -12vh, 0) scale(1.30); }
}
@keyframes sky-drift-d {
  0%, 100% { transform: translate3d(0, 0, 0) scale(1.10); }
  50%      { transform: translate3d(-18vw, 20vh, 0) scale(.84); }
}
@keyframes sky-drift-e {
  0%, 100% { transform: translate3d(0, 0, 0) scale(.90); }
  50%      { transform: translate3d(17vw, -14vh, 0) scale(1.28); }
}

/* Lifts the middle so the card sits on a calm ground, and settles the edges. */
.sky-veil {
  inset: 0;
  background:
    radial-gradient(30% 26% at 50% 46%, rgba(255, 255, 255, .30) 0%, rgba(255, 255, 255, .08) 58%, transparent 84%),
    radial-gradient(80% 70% at 50% 46%, transparent 58%, rgba(62, 24, 27, .08) 100%);
}

/* ---- the card ----------------------------------------------------------- */

.signin-card {
  position: relative;
  z-index: 1;
  place-self: center;
  width: 100%;
  max-width: 372px;
  padding: var(--sp-8) var(--sp-6) var(--sp-6);
  background-color: var(--thsti-surface);
  background-image: var(--thsti-gradient);
  background-repeat: no-repeat;
  background-size: 100% 3px;
  background-position: top left;
  border-radius: var(--r-1);
  box-shadow: 0 18px 44px rgba(62, 24, 27, .14), 0 2px 8px rgba(62, 24, 27, .08);
}

.signin-fields { display: grid; gap: var(--sp-3); }
.signin-fields .input { height: 46px; }
.signin-card .btn-primary { width: 100%; height: 46px; margin-top: var(--sp-2); }

/* The label is in the placeholder; kept here for anyone using a screen reader. */
.vh {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}

.signin-reveal {
  position: absolute;
  right: 5px; top: 50%;
  transform: translateY(-50%);
  display: grid; place-items: center;
  width: 34px; height: 34px;
  background: none;
  border: 0;
  border-radius: var(--r-1);
  color: var(--thsti-muted);
  cursor: pointer;
  transition: color var(--dur-1) var(--ease), background var(--dur-1) var(--ease);
}
.signin-reveal:hover { color: var(--thsti-maroon); background: var(--thsti-panel); }
.signin-reveal .icon { width: 17px; height: 17px; }
.signin-reveal .when-shown { display: none; }
.signin-reveal.is-shown .when-hidden { display: none; }
.signin-reveal.is-shown .when-shown { display: block; }
.input-icon .input.has-reveal { padding-right: 44px; }

.signin-msg {
  margin-bottom: var(--sp-4);
  padding: 10px 12px;
  border-left: 3px solid var(--thsti-error);
  border-radius: var(--r-1);
  background: var(--thsti-error-bg);
  color: #96201F;
  font-size: var(--fs-xs);
}
.signin-msg.is-ok {
  border-left-color: var(--thsti-success);
  background: var(--thsti-success-bg);
  color: #1F5C32;
}

.signin-foot {
  position: relative;
  z-index: 1;
  font-size: var(--fs-xs);
  color: var(--thsti-text-2nd);
  text-align: center;
}

/* ---- signing in ---------------------------------------------------------
   Over the card rather than instead of it, so the field carries on behind
   and the page does not appear to jump somewhere else. */

.signing {
  position: fixed;
  inset: 0;
  z-index: 5;
  display: none;
  justify-items: center;
  align-content: center;
  gap: var(--sp-4);
  background: rgba(244, 245, 248, .94);
  -webkit-backdrop-filter: blur(10px);
          backdrop-filter: blur(10px);
}
.signing.is-on { display: grid; animation: signing-in var(--dur-3) var(--ease) both; }
@keyframes signing-in { from { opacity: 0; } to { opacity: 1; } }

.signing img { height: 48px; width: auto; display: block; }
.signing p { margin: 0; font-size: var(--fs-sm); color: var(--thsti-text-2nd); }

/* A bar rather than beating dots: it says how far along, and it is the same
   cover MEGA shows, so the two applications wait the same way. */
.signing-bar {
  width: min(320px, 72vw);
  height: 6px;
  background: var(--thsti-divider);
  border-radius: var(--r-pill);
  overflow: hidden;
}
.signing-bar i {
  display: block;
  width: 0;
  height: 100%;
  background: var(--thsti-gradient);
  /* laid over the whole bar, not stretched across the fill */
  background-size: 320px 100%;
  border-radius: var(--r-pill);
  transition: width .12s linear;
}
.signing-pct {
  font-family: var(--thsti-font-heading);
  font-weight: 600;
  font-size: var(--fs-sm);
  color: var(--thsti-text-2nd);
  font-variant-numeric: tabular-nums;
}

@media (prefers-reduced-motion: reduce) {
  .signing.is-on { animation: none; }
  .signing-bar i { transition: none; }
}

@media (max-width: 560px) {
  .signin { padding: var(--sp-6) var(--sp-4); }
  .signin-card { padding: var(--sp-6) var(--sp-5) var(--sp-5); }
}

/* Motion is decoration here: none of it carries meaning, so it can all go. */
@media (prefers-reduced-motion: reduce) {
  .sky-glow, .sky-glow i { animation: none; }
}

/* ============================================================================
   Two panels in one card: what this is on the left, in the graphite of the
   navigation panel; the form on the right. The same composition MEGA uses,
   so the two applications are signed into the same way.
   ========================================================================= */

.signin-card.signin-split {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1fr);
  max-width: 880px;
  padding: 0;
  overflow: hidden;
  background-color: var(--thsti-surface);
}

/* ---- what this is --------------------------------------------------------- */

.signin-brand {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: var(--sp-8);
  padding: 44px 40px 32px;
  overflow: hidden;
  color: #fff;
  /* the navigation panel's graphite, with a soft glow of the brand orange
     from the lower corner and the maroon from the upper one */
  background:
    radial-gradient(90% 60% at 100% 110%, rgba(245, 137, 32, 0.16), transparent 70%),
    radial-gradient(70% 55% at -10% -10%, rgba(168, 37, 43, 0.20), transparent 70%),
    linear-gradient(180deg, rgba(245, 137, 32, 0.022), rgba(168, 37, 43, 0.038)),
    #2A2C2F;
}

/* the mark again, large and very faint, cropped by the corner */
.signin-brand-mark {
  position: absolute;
  right: -70px; bottom: -70px;
  width: 260px; height: auto;
  opacity: 0.06;
  pointer-events: none;
  user-select: none;
}
.signin-brand-top { position: relative; }
.signin-brand-logo { display: block; width: 52px; height: auto; margin-bottom: 26px; }
.signin-eyebrow {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: #F6A55E;                       /* the brand orange, lifted for a dark panel */
}
.signin-title {
  margin: 8px 0 14px;
  font-family: var(--thsti-font-heading);
  font-weight: 700;
  font-size: 34px;
  line-height: 1.15;
  letter-spacing: 0.01em;
  color: #fff;
}
.signin-tag {
  margin: 0;
  max-width: 34ch;
  font-size: 15px;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.74);
}
.signin-brand-foot {
  position: relative;
  padding-top: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  font-size: 13px;
  letter-spacing: 0.02em;
  color: rgba(255, 255, 255, 0.60);
}

/* ---- the form ------------------------------------------------------------- */

.signin-form {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 48px 44px 32px;
}
.signin-heading {
  margin: 0 0 6px;
  font-family: var(--thsti-font-heading);
  font-weight: 700;
  font-size: 26px;
  color: var(--thsti-text);
}
.signin-note { margin: 0 0 26px; font-size: 15px; color: var(--thsti-text-2nd); }

.signin-split .signin-msg {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  margin-bottom: 18px;
}
.signin-split .signin-msg .icon { flex: 0 0 auto; width: 16px; height: 16px; margin-top: 2px; }

.signin-split .signin-fields { gap: 14px; }
.signin-split .btn-primary { display: flex; align-items: center; justify-content: center; gap: 8px; }
.signin-split .btn-primary .icon { width: 17px; height: 17px; transition: transform var(--dur-2) var(--ease); }
.signin-split .btn-primary:hover .icon { transform: translateX(3px); }

.signin-form-foot {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-top: 30px;
  padding-top: 16px;
  border-top: 1px solid var(--thsti-rule);
  font-size: 13px;
  color: var(--thsti-text-2nd);
}
.signin-form-foot .icon { width: 15px; height: 15px; color: var(--thsti-maroon); }

/* ---- narrow screens: what this is stacks above the form ------------------- */

@media (max-width: 760px) {
  .signin-card.signin-split { grid-template-columns: minmax(0, 1fr); max-width: 440px; }
  .signin-brand { gap: var(--sp-5); padding: 28px 26px 22px; }
  .signin-brand-logo { width: 42px; margin-bottom: 16px; }
  .signin-title { font-size: 26px; margin-bottom: 10px; }
  .signin-tag { font-size: 14px; }
  .signin-brand-mark { width: 180px; height: auto; right: -50px; bottom: -50px; }
  .signin-form { padding: 30px 26px 24px; }
  .signin-form-foot { margin-top: 24px; }
}