/* ============================================================
   Rakeen Login Lab — Example 2 "Lumen"  (Centered Card)
   ============================================================ */

/* ── Theme tokens ─────────────────────────────────────────── */
.lu-body {
  --lu-bg:           var(--paper);
  --lu-bg-elev:      var(--paper-2);
  --lu-text:         var(--rk-ink);
  --lu-text-soft:    var(--ink-65);
  /* Bumped from --ink-50 to ensure WCAG AA contrast on 12px body text */
  --lu-text-mute:    rgba(22, 29, 54, 0.62);
  --lu-line:         var(--ink-12);
  --lu-line-strong:  var(--ink-20);
  --lu-cta:          var(--rk-blue);
  --lu-cta-hover:    var(--blue-80);
  --lu-grid-color:   rgba(22,29,54,0.04);
  --lu-shadow:       0 24px 64px rgba(22,29,54,0.10), 0 6px 16px rgba(22,29,54,0.06);
  --lu-shadow-lift:  0 40px 100px rgba(22,29,54,0.18), 0 12px 28px rgba(22,29,54,0.10);
  --lu-red:          #FF4D6D;
}
.lu-body.is-dark {
  --lu-bg:           #0B1024;
  --lu-bg-elev:      #1A2244;
  --lu-text:         var(--paper);
  --lu-text-soft:    rgba(243,248,248,0.74);
  --lu-text-mute:    rgba(243,248,248,0.48);
  --lu-line:         rgba(243,248,248,0.10);
  --lu-line-strong:  rgba(243,248,248,0.20);
  --lu-cta:          #6586DC;
  --lu-cta-hover:    #7E9CE4;
  --lu-grid-color:   rgba(255,77,109,0.06);
  --lu-shadow:       0 24px 64px rgba(0,0,0,0.48), 0 6px 16px rgba(0,0,0,0.30);
  --lu-shadow-lift:  0 40px 100px rgba(0,0,0,0.62), 0 12px 28px rgba(0,0,0,0.40);
}

/* ── Base ─────────────────────────────────────────────────── */
.lu-body {
  margin: 0;
  min-height: 100vh;
  background: var(--lu-bg);
  color: var(--lu-text);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  transition:
    background-color 480ms cubic-bezier(0.65,0,0.35,1),
    color 480ms cubic-bezier(0.65,0,0.35,1);
}

.lu-skip {
  position: fixed; top: -100px; left: 16px;
  background: var(--rk-blue); color: var(--paper);
  padding: 10px 16px; border-radius: var(--r-sm);
  text-decoration: none; z-index: 9999;
  transition: top var(--dur-2) var(--ease-out);
}
.lu-skip:focus { top: 16px; }

/* ── Background layers ────────────────────────────────────── */
.lu-bg {
  position: fixed; inset: 0; pointer-events: none; z-index: 0;
  overflow: hidden;
}
.lu-bg__grid {
  position: absolute; inset: -10%;
  background-image:
    linear-gradient(var(--lu-grid-color) 1px, transparent 1px),
    linear-gradient(90deg, var(--lu-grid-color) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: radial-gradient(ellipse at center, #000 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse at center, #000 30%, transparent 75%);
  transition: opacity 480ms;
  opacity: 1;
}
.lu-body.is-dark .lu-bg__grid {
  opacity: 1.6;
  background-image:
    linear-gradient(rgba(255,77,109,0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,77,109,0.07) 1px, transparent 1px);
}
.lu-bg__bloom {
  position: absolute;
  top: 6%; left: 50%;
  width: 1100px; height: 1100px;
  margin-left: -550px;
  background: radial-gradient(circle, rgba(255,233,168,0.55) 0%, transparent 55%);
  opacity: 0;
  /* GSAP owns opacity — no CSS transition */
}
.lu-bg__bloom-red {
  position: absolute;
  top: 6%; left: 50%;
  width: 900px; height: 900px;
  margin-left: -450px;
  background: radial-gradient(circle, rgba(255,77,109,0.32) 0%, transparent 60%);
  opacity: 0;
}

/* concentric pulse rings emanating from the bulb */
.lu-bg__ring {
  position: absolute;
  top: 18%; left: 50%;
  width: 200px; height: 200px;
  margin-left: -100px;
  margin-top: -100px;
  border-radius: 50%;
  border: 1px solid rgba(58,93,192,0.30);
  opacity: 0;
  transform: scale(1);
  pointer-events: none;
}
.lu-bg__ring--1 { transition-delay: 0ms; }
.lu-bg__ring--2 { transition-delay: 200ms; }
.lu-bg__ring--3 { transition-delay: 400ms; }
.lu-bg__ring.is-pulse {
  animation: luRingPulse 2200ms cubic-bezier(0.16, 1, 0.3, 1) forwards;
}
@keyframes luRingPulse {
  0%   { opacity: 0;    transform: scale(0.4); }
  10%  { opacity: 0.7; }
  100% { opacity: 0;    transform: scale(5.5); border-color: rgba(58,93,192,0.05); }
}

/* ── Layout ───────────────────────────────────────────────── */
.lu {
  position: relative; z-index: 2;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 48px 24px 40px;
  gap: 24px;
}

.lu-brand {
  text-align: center;
  display: flex;
  justify-content: center;
}
.lu-brand .eyebrow {
  font-size: 12px;
  letter-spacing: 0.32em;
  font-weight: 700;
  color: var(--lu-text-soft);
  transition: color 480ms;
}
.lu-brand__wordmark {
  display: block;
  height: 22px;
  width: auto;
  fill: var(--lu-text-soft);
  transition: fill 480ms;
}

/* ── Bulb scene ───────────────────────────────────────────── */
.lu-scene {
  position: relative;
  margin: 8px 0 -28px; /* tucks bulb slightly into card */
}
.lu-bulb {
  width: 220px; height: auto;
  filter: drop-shadow(0 30px 50px rgba(22,29,54,0.18));
  transition: filter 480ms;
}
.lu-body.is-dark .lu-bulb {
  filter: drop-shadow(0 30px 50px rgba(0,0,0,0.55)) drop-shadow(0 0 24px rgba(255,77,109,0.28));
}

/* face — theme-aware so smile/frown stay visible */
.lu-face__eye   { fill: var(--rk-ink); transition: fill 480ms; }
.lu-face__mouth { stroke: var(--rk-ink); transition: stroke 480ms; }
.lu-body.is-dark .lu-face__eye   { fill: var(--paper); }
.lu-body.is-dark .lu-face__mouth { stroke: var(--paper); }
.lu-body.is-dark #lu-bulb-red-tint { fill: #FF6B85; }

@media (max-width: 520px) {
  .lu-bulb { width: 180px; }
}

/* ── Card ─────────────────────────────────────────────────── */
.lu-card {
  position: relative;
  width: 100%;
  max-width: 420px;
  background: var(--lu-bg-elev);
  border-radius: var(--r-xl);
  padding: 56px 36px 36px;
  box-shadow: var(--lu-shadow);
  transition: background-color 480ms, box-shadow 480ms;
}

.lu-card__head {
  text-align: center;
  margin-bottom: 28px;
}
.lu-title {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 600;
  letter-spacing: -0.018em;
  margin: 0 0 6px;
  color: var(--lu-text);
  transition: color 480ms;
}
.lu-sub {
  margin: 0;
  font-size: 14px;
  color: var(--lu-text-soft);
  transition: color 480ms;
}

/* ── Form ─────────────────────────────────────────────────── */
.lu-form {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.lu-field {
  position: relative;
  height: 52px;
  display: flex;
  align-items: center;
  background: var(--lu-bg);
  border: 1.5px solid var(--lu-line);
  border-radius: var(--r-md);
  padding: 0 16px 0 44px;
  transition: all var(--dur-2) var(--ease-out);
}
.lu-field:focus-within {
  border-color: var(--lu-cta);
  background: var(--lu-bg-elev);
  box-shadow: 0 0 0 4px var(--blue-glow);
}
.lu-body.is-dark .lu-field:focus-within {
  box-shadow: 0 0 0 4px rgba(101,134,220,0.28);
}
.lu-field--error { border-color: var(--lu-red); box-shadow: 0 0 0 4px rgba(255,77,109,0.20); }
.lu-field--error:focus-within { border-color: var(--lu-red); box-shadow: 0 0 0 4px rgba(255,77,109,0.28); }

.lu-field__icon {
  position: absolute;
  left: 14px; top: 50%;
  transform: translateY(-50%);
  display: inline-grid; place-items: center;
  color: var(--lu-text-mute);
  transition: color var(--dur-2);
}
.lu-field__icon svg { width: 18px; height: 18px; }
.lu-field:focus-within .lu-field__icon { color: var(--lu-cta); }
.lu-field--error .lu-field__icon { color: var(--lu-red); }

.lu-field input {
  width: 100%;
  background: transparent;
  border: none;
  outline: none;
  font: inherit;
  font-size: 15px;
  font-weight: 500;
  color: var(--lu-text);
  padding: 0;
  transition: color 480ms;
}
.lu-field input::placeholder { color: var(--lu-text-mute); }

.lu-field--password { padding-right: 44px; }
.lu-eye {
  position: absolute;
  right: 6px; top: 6px;
  width: 40px; height: 40px;
  background: transparent;
  border: none;
  border-radius: var(--r-sm);
  color: var(--lu-text-mute);
  cursor: pointer;
  display: grid; place-items: center;
  transition: all var(--dur-2);
}
.lu-eye:hover { color: var(--lu-text); background: var(--ink-5); }
.lu-body.is-dark .lu-eye:hover { background: rgba(243,248,248,0.08); }
.lu-eye svg { width: 18px; height: 18px; }
.lu-eye .lu-eye__shut { display: none; }
.lu-eye[aria-pressed="true"] .lu-eye__open { display: none; }
.lu-eye[aria-pressed="true"] .lu-eye__shut { display: block; }

/* row */
.lu-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin: 2px 4px;
}
.lu-check {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  font-weight: 500;
  color: var(--lu-text-soft);
  cursor: pointer;
  user-select: none;
}
.lu-check input { position: absolute; opacity: 0; pointer-events: none; }
.lu-check__box {
  width: 18px; height: 18px;
  border: 1.5px solid var(--lu-line-strong);
  border-radius: 5px;
  display: grid; place-items: center;
  color: transparent;
  transition: all var(--dur-2);
}
.lu-check__box svg { width: 12px; height: 12px; }
.lu-check input:checked + .lu-check__box {
  background: var(--lu-cta);
  border-color: var(--lu-cta);
  color: var(--paper);
}
.lu-link {
  color: var(--lu-cta);
  text-decoration: none;
  font-size: 13px;
  font-weight: 600;
  transition: color var(--dur-2);
}
.lu-link:hover { color: var(--lu-cta-hover); }

/* submit */
.lu-submit {
  position: relative;
  height: 50px;
  background: var(--lu-cta);
  color: var(--paper);
  border: none;
  border-radius: var(--r-md);
  font-family: inherit;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -0.005em;
  cursor: pointer;
  overflow: hidden;
  margin-top: 6px;
  box-shadow: 0 8px 24px rgba(58,93,192,0.28);
  transition: background-color var(--dur-2), box-shadow var(--dur-3), transform var(--dur-2);
}
.lu-submit:hover { background: var(--lu-cta-hover); box-shadow: var(--shadow-blue-lg); transform: translateY(-1px); }
.lu-submit:active { transform: translateY(0); }
.lu-submit:focus-visible { outline: none; box-shadow: var(--shadow-blue-lg), 0 0 0 4px var(--blue-glow); }
.lu-submit.is-loading { pointer-events: none; }

.lu-submit__label,
.lu-submit__spinner,
.lu-submit__check {
  position: absolute; inset: 0;
  display: grid; place-items: center;
  transition: opacity var(--dur-2);
}
.lu-submit__spinner {
  width: 22px; height: 22px;
  inset: auto; top: 50%; left: 50%;
  margin: -11px 0 0 -11px;
  border: 2.5px solid rgba(255,255,255,0.30);
  border-top-color: var(--paper);
  border-radius: 50%;
  opacity: 0;
  animation: luSpin 800ms linear infinite;
}
@keyframes luSpin { to { transform: rotate(360deg); } }

.lu-submit__check { opacity: 0; }
.lu-submit__check svg { width: 22px; height: 22px; color: var(--paper); }

.lu-submit.is-loading .lu-submit__label { opacity: 0; }
.lu-submit.is-loading .lu-submit__spinner { opacity: 1; }
.lu-submit.is-success .lu-submit__label,
.lu-submit.is-success .lu-submit__spinner { opacity: 0; }
.lu-submit.is-success .lu-submit__check { opacity: 1; }
.lu-submit.is-success { background: #2EBF8A; box-shadow: 0 12px 32px rgba(46,191,138,0.40); }

/* divider */
.lu-divider {
  display: flex; align-items: center; gap: 12px;
  margin: 6px 0 -2px;
  color: var(--lu-text-mute);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}
.lu-divider::before,
.lu-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--lu-line);
}

/* SSO */
.lu-sso {
  height: 46px;
  background: transparent;
  color: var(--lu-text);
  border: 1.5px solid var(--lu-line-strong);
  border-radius: var(--r-md);
  font-family: inherit;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  transition: all var(--dur-2);
}
.lu-sso:hover { background: var(--ink-5); border-color: var(--lu-cta); color: var(--lu-cta); }
.lu-body.is-dark .lu-sso:hover { background: rgba(243,248,248,0.06); }
.lu-sso svg { width: 16px; height: 16px; }

.lu-welcome {
  position: absolute;
  bottom: 16px; left: 0; right: 0;
  text-align: center;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--lu-cta);
  opacity: 0;
  transform: translateY(6px);
  margin: 0;
}

.lu-foot {
  margin-top: 16px;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.lu-foot code {
  font-family: var(--font-mono);
  background: var(--ink-5);
  padding: 2px 8px;
  border-radius: var(--r-xs);
  font-size: 11px;
  color: var(--lu-text);
}
.lu-body.is-dark .lu-foot code { background: rgba(243,248,248,0.08); }

/* ── Toast ───────────────────────────────────────────────── */
.lu-toast {
  position: fixed;
  top: 24px; right: 24px;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px 14px 14px;
  background: var(--lu-bg-elev);
  color: var(--lu-text);
  border: 1px solid var(--lu-line);
  border-left: 3px solid var(--lu-red);
  border-radius: var(--r-md);
  box-shadow: var(--lu-shadow);
  z-index: 1000;
  min-width: 280px; max-width: 380px;
  transform: translateX(120%);
  opacity: 0;
  pointer-events: none;
  transition: transform var(--dur-3) var(--ease-out), opacity var(--dur-2);
  font-size: 14px;
  font-weight: 500;
}
.lu-toast.is-on { transform: translateX(0); opacity: 1; pointer-events: auto; }
.lu-toast__icon { color: var(--lu-red); display: inline-grid; place-items: center; flex-shrink: 0; }
.lu-toast__icon svg { width: 22px; height: 22px; }
.lu-toast__msg { flex: 1; }
.lu-toast__close {
  background: transparent; border: none; cursor: pointer;
  color: var(--lu-text-mute);
  font-size: 20px; line-height: 1; padding: 0; width: 24px; height: 24px;
}
.lu-toast__close:hover { color: var(--lu-text); }

/* ── Reduced motion ──────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
}