/* --------------------------------------------------------------------------
   The entry page: dark, animated, one card.

   Three stacked backgrounds, cheapest first:
     1. a static radial gradient wash          (paints instantly)
     2. two blurred CSS "aurora" blobs, drifting
     3. #fx, a canvas carrying a curl-noise particle flow (js/fx.js)
   If the canvas never starts -- reduced motion, tiny device, no 2d context --
   layers 1 and 2 still look deliberate.
   -------------------------------------------------------------------------- */

body.dark {
  background: var(--d-bg);
  color: var(--d-ink);
  min-height: 100vh;
  overflow-x: hidden;
}

.bg-wash {
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background:
    radial-gradient(1100px 700px at 12% 8%,  rgba(23, 127, 143, .28), transparent 62%),
    radial-gradient(900px 620px at 88% 92%,  rgba(243, 111, 33, .16), transparent 60%),
    radial-gradient(700px 700px at 78% 12%,  rgba(99, 102, 241, .13), transparent 65%),
    linear-gradient(180deg, var(--d-bg-2), var(--d-bg) 55%);
}

/* width/height are explicit: a canvas is a replaced element, so `inset: 0`
   alone leaves it at its intrinsic 300x150 rather than stretching. */
#fx {
  position: fixed; inset: 0; width: 100%; height: 100%;
  z-index: 1; pointer-events: none; opacity: .95;
}

.aurora {
  position: fixed; z-index: 0; border-radius: 50%;
  filter: blur(90px); opacity: .38; pointer-events: none;
  will-change: transform;
}
.aurora-a {
  width: 46vw; height: 46vw; left: -10vw; top: -12vw;
  background: radial-gradient(circle, var(--teal), transparent 68%);
  animation: drift-a 26s var(--e-in-out) infinite alternate;
}
.aurora-b {
  width: 40vw; height: 40vw; right: -12vw; bottom: -14vw;
  background: radial-gradient(circle, var(--orange), transparent 66%);
  animation: drift-b 32s var(--e-in-out) infinite alternate;
}
@keyframes drift-a { to { transform: translate3d(9vw, 7vh, 0) scale(1.16); } }
@keyframes drift-b { to { transform: translate3d(-8vw, -6vh, 0) scale(1.1); } }

/* Fine grid, for the "instrument" feel. Masked so it fades out at the edges. */
.grid-lines {
  position: fixed; inset: 0; z-index: 1; pointer-events: none; opacity: .25;
  background-image:
    linear-gradient(rgba(255, 255, 255, .045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .045) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: radial-gradient(circle at 50% 40%, #000 20%, transparent 78%);
          mask-image: radial-gradient(circle at 50% 40%, #000 20%, transparent 78%);
}

/* ==========================================================================
   Layout
   ========================================================================== */

.entry {
  position: relative; z-index: 2;
  min-height: 100vh;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  gap: var(--sp-8);
  align-items: center;
  max-width: 1240px;
  margin: 0 auto;
  padding: var(--sp-7) var(--sp-5) var(--sp-6);
}
@media (max-width: 940px) {
  .entry { grid-template-columns: 1fr; gap: var(--sp-6); padding-top: var(--sp-6); }
  .pitch { text-align: center; }
  .pitch .feats { justify-content: center; }
}

/* ---- left: the pitch --------------------------------------------------- */

.brandmark {
  display: inline-flex; align-items: center; gap: 14px;
  margin-bottom: var(--sp-6);
}
.brandmark img {
  height: 46px; width: auto;
  /* The logo is dark teal on white; on a dark field it needs lifting. */
  filter: brightness(1.5) saturate(1.15) drop-shadow(0 2px 14px rgba(23, 127, 143, .45));
}
.brandmark .divider { width: 1px; height: 30px; background: var(--d-line); }
.brandmark .product {
  font-size: var(--t-lg); font-weight: 700; letter-spacing: .22em;
  color: var(--d-ink); text-transform: uppercase;
}

.pitch h1 {
  font-size: clamp(2.1rem, 5vw, var(--t-3xl));
  line-height: 1.12;
  font-weight: 700;
  letter-spacing: -.03em;
  margin-bottom: var(--sp-4);
}
.pitch h1 .grad {
  background: linear-gradient(100deg, var(--teal-300) 8%, #7fd6de 40%, var(--orange) 92%);
  -webkit-background-clip: text; background-clip: text;
  color: transparent;
  background-size: 220% 100%;
  animation: grad-slide 9s ease-in-out infinite alternate;
}
@keyframes grad-slide { to { background-position: 100% 0; } }

.pitch .lede {
  font-size: var(--t-lg); color: var(--d-muted); max-width: 46ch;
  margin-bottom: var(--sp-5);
}
@media (max-width: 940px) { .pitch .lede { margin-inline: auto; } }

.feats { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: var(--sp-5); }
.feat {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 7px 13px;
  border: 1px solid var(--d-line);
  border-radius: var(--r-pill);
  background: var(--d-glass);
  font-size: var(--t-sm); color: var(--d-ink);
  backdrop-filter: blur(8px);
  transition: transform var(--dur-2) var(--e-spring),
              background var(--dur-2) ease, border-color var(--dur-2) ease;
}
.feat:hover { transform: translateY(-2px); background: var(--d-glass-2); border-color: rgba(255,255,255,.2); }
.feat .sw { width: 9px; height: 9px; border-radius: 3px; flex: none; }

/* The promo strip, dark variant. */
.promo-dark {
  position: relative; overflow: hidden;
  display: flex; align-items: center; gap: 14px;
  max-width: 480px;
  padding: 14px 18px;
  border: 1px solid rgba(243, 111, 33, .35);
  border-radius: var(--r-md);
  background: linear-gradient(100deg, rgba(243, 111, 33, .16), rgba(23, 127, 143, .12));
}
@media (max-width: 940px) { .promo-dark { margin-inline: auto; } }
.promo-dark::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(100deg, transparent 40%, rgba(255,255,255,.14) 50%, transparent 60%);
  transform: translateX(-100%);
  animation: shimmer 5.5s var(--e-in-out) infinite;
}
@keyframes shimmer { 0%, 55% { transform: translateX(-100%); } 100% { transform: translateX(100%); } }
.promo-dark .tag {
  flex: none; padding: 3px 9px; border-radius: var(--r-pill);
  background: var(--orange); color: #fff;
  font-size: var(--t-xs); font-weight: 700; letter-spacing: .04em;
}
.promo-dark b { display: block; font-size: var(--t-md); }
.promo-dark span { font-size: var(--t-sm); color: var(--d-muted); }

/* ---- right: the card --------------------------------------------------- */

.auth-card {
  position: relative;
  padding: var(--sp-6);
  border-radius: var(--r-lg);
  background: rgba(9, 24, 32, .72);
  border: 1px solid var(--d-line);
  box-shadow: 0 30px 80px rgba(0, 0, 0, .5);
  backdrop-filter: blur(18px) saturate(1.2);
  animation: pop-in var(--dur-4) var(--e-out) both;
}
/* Gradient hairline that rotates slowly around the card edge. */
.auth-card::before {
  content: ""; position: absolute; inset: -1px; border-radius: inherit;
  padding: 1px;
  background: conic-gradient(from var(--a, 0deg), transparent 0deg,
              rgba(23, 127, 143, .85) 60deg, transparent 130deg,
              transparent 220deg, rgba(243, 111, 33, .7) 290deg, transparent 350deg);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor; mask-composite: exclude;
  pointer-events: none;
  animation: edge 12s linear infinite;
}
@property --a { syntax: '<angle>'; inherits: false; initial-value: 0deg; }
@keyframes edge { to { --a: 360deg; } }

.auth-card h2 { font-size: var(--t-xl); font-weight: 700; letter-spacing: -.02em; }
.auth-card .sub { color: var(--d-muted); font-size: var(--t-sm); margin-top: 4px; }

/* Segmented sign-in / create-account control with a sliding thumb. */
.segs {
  position: relative; display: grid; grid-template-columns: 1fr 1fr;
  padding: 4px; margin-bottom: var(--sp-5);
  border: 1px solid var(--d-line); border-radius: var(--r-sm);
  background: rgba(0, 0, 0, .25);
}
.segs .thumb {
  position: absolute; top: 4px; left: 4px; bottom: 4px;
  width: calc(50% - 4px);
  border-radius: 6px;
  background: linear-gradient(100deg, var(--teal), var(--teal-600));
  box-shadow: 0 4px 14px rgba(23, 127, 143, .45);
  transition: transform var(--dur-3) var(--e-spring);
}
.segs[data-tab="up"] .thumb { transform: translateX(100%); }
.segs button {
  position: relative; z-index: 1;
  padding: 9px 0; border: 0; background: none; cursor: pointer;
  color: var(--d-muted); font-size: var(--t-md); font-weight: 600;
  transition: color var(--dur-2) ease;
}
.segs button[aria-selected="true"] { color: #fff; }

/* Panels cross-fade; the card height animates to the taller of the two. */
.panes { position: relative; }
.pane { display: none; }
.pane.on { display: block; animation: pane-in var(--dur-3) var(--e-out); }
@keyframes pane-in { from { opacity: 0; transform: translateY(8px); } }

/* Dark skin for the shared field component. */
.dark .field input, .dark .field select, .dark .field textarea {
  background: rgba(255, 255, 255, .05);
  border-color: var(--d-line);
  color: var(--d-ink);
}
.dark .field label { color: var(--d-muted); }
.dark .field input:focus, .dark .field textarea:focus, .dark .field select:focus {
  border-color: var(--teal-300);
  background: rgba(255, 255, 255, .08);
  box-shadow: 0 0 0 4px rgba(74, 168, 182, .18);
}
.dark .field input:focus + label,
.dark .field input:not(:placeholder-shown) + label { color: var(--teal-300); }
.dark .field .peek:hover { background: rgba(255, 255, 255, .08); color: var(--d-ink); }
.dark .field-hint { color: var(--d-muted); }
.dark .btn-ghost { --btn-fg: var(--d-muted); --btn-bg-hover: rgba(255,255,255,.07); }
.dark .btn-light {
  --btn-bg: rgba(255,255,255,.07); --btn-bg-hover: rgba(255,255,255,.12);
  --btn-fg: var(--d-ink); --btn-border: var(--d-line);
}
.dark a { color: var(--teal-300); }

/* Password strength: four segments that fill and take the meter's colour. */
.strength { display: flex; gap: 5px; margin: -8px 0 6px; }
.strength i {
  height: 3px; flex: 1; border-radius: 2px;
  background: rgba(255, 255, 255, .12);
  transition: background var(--dur-3) var(--e-out);
}
.strength[data-score="1"] i:nth-child(-n+1) { background: var(--danger); }
.strength[data-score="2"] i:nth-child(-n+2) { background: var(--amber); }
.strength[data-score="3"] i:nth-child(-n+3) { background: #3ddc84; }
.strength[data-score="4"] i                 { background: var(--success); }
.strength-txt { font-size: var(--t-xs); color: var(--d-muted); margin-bottom: 10px; }

/* Six-box verification code entry. */
.code-boxes { display: flex; gap: 10px; justify-content: space-between; margin: var(--sp-4) 0; }
.code-boxes input {
  width: 100%; height: 58px; padding: 0;
  text-align: center; font-size: var(--t-xl); font-weight: 700;
  font-family: var(--mono);
  border: 1px solid var(--d-line); border-radius: var(--r-sm);
  background: rgba(255, 255, 255, .05); color: var(--d-ink);
  transition: border-color var(--dur-1) ease, transform var(--dur-2) var(--e-spring),
              box-shadow var(--dur-2) var(--e-out), background var(--dur-1) ease;
}
.code-boxes input:focus {
  outline: none; border-color: var(--teal-300); background: rgba(255,255,255,.09);
  transform: translateY(-2px);
  box-shadow: 0 0 0 4px rgba(74, 168, 182, .18);
}
.code-boxes input.filled { border-color: rgba(74, 168, 182, .55); }

/* The mock backend cannot send email, so it prints the code here instead. */
.devnote {
  display: flex; align-items: center; gap: 10px;
  margin-top: var(--sp-3); padding: 10px 14px;
  border: 1px dashed rgba(255, 193, 7, .5);
  border-radius: var(--r-sm);
  background: rgba(255, 193, 7, .08);
  font-size: var(--t-sm); color: #ffe08a;
}
.devnote code {
  font-family: var(--mono); font-size: var(--t-lg); font-weight: 700;
  letter-spacing: .18em; color: #fff;
}

.alert {
  display: flex; align-items: flex-start; gap: 10px;
  padding: 11px 14px; margin-bottom: var(--sp-4);
  border-radius: var(--r-sm);
  font-size: var(--t-sm);
  animation: pop-in var(--dur-2) var(--e-out);
}
.dark .alert-bad  { background: rgba(220, 53, 69, .14); border: 1px solid rgba(220,53,69,.4); color: #ffb3ba; }
.dark .alert-ok   { background: rgba(25, 135, 84, .14); border: 1px solid rgba(25,135,84,.4);  color: #9fe0bd; }
.dark .alert-info { background: rgba(13, 110, 253, .12); border: 1px solid rgba(13,110,253,.35); color: #a9c9ff; }

.entry-foot {
  position: relative; z-index: 2;
  display: flex; flex-wrap: wrap; gap: var(--sp-3) var(--sp-5);
  justify-content: center; align-items: center;
  padding: var(--sp-5) var(--sp-5) var(--sp-6);
  color: var(--d-muted); font-size: var(--t-sm);
  border-top: 1px solid var(--d-line-soft);
  margin: 0 auto; max-width: 1240px;
}
.entry-foot a { color: var(--d-muted); }
.entry-foot a:hover { color: var(--d-ink); }