:root {
  --auth-blue: #0c6f9f;
  --auth-blue-deep: #082f49;
  --auth-green: #74cf54;
  --auth-ink: #183040;
  --auth-line: rgba(255, 255, 255, .22);
}

body.unified-signin-shell {
  min-height: 100vh;
  margin: 0;
  color: #fff;
  background:
    linear-gradient(112deg, rgba(10, 24, 38, .76), rgba(20, 56, 76, .54) 48%, rgba(83, 47, 31, .5)),
    url('/static/btb/images/premium-corporate-lounge.webp') center / cover no-repeat fixed;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

body.unified-signin-shell::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(rgba(7, 22, 36, .24), rgba(7, 22, 36, .24)),
    url('/static/btb/images/premium-corporate-lounge.webp') center / cover no-repeat fixed;
  filter: blur(10px) saturate(.95);
  transform: scale(1.04);
}

.unified-auth-page {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  box-sizing: border-box;
  padding: 16px 20px;
  background: linear-gradient(180deg, rgba(0, 38, 61, .18), rgba(0, 25, 42, .42));
  backdrop-filter: saturate(1.06);
}

.unified-auth-nav {
  width: min(100%, 1080px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 10px;
}

.unified-auth-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #fff;
  text-decoration: none;
}

.unified-auth-brand img {
  width: 38px;
  height: 38px;
  border-radius: 8px;
  padding: 4px;
  background: rgba(255, 255, 255, .96);
  box-shadow: 0 12px 28px rgba(4, 40, 66, .24);
}

.unified-auth-brand strong {
  display: block;
  font-size: 16px;
  line-height: 1.05;
}

.unified-auth-brand span span {
  display: block;
  margin-top: 4px;
  color: rgba(255, 255, 255, .72);
  font-size: 13px;
  font-weight: 700;
}

.unified-auth-badge {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  border: 1px solid var(--auth-line);
  border-radius: 8px;
  padding: 0 14px;
  background: rgba(255, 255, 255, .11);
  color: #fff;
  font-size: 13px;
  font-weight: 800;
  box-shadow: 0 10px 24px rgba(4, 35, 58, .18);
  backdrop-filter: blur(14px);
}

.auth-surface-tabs {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  border: 1px solid rgba(255, 255, 255, .22);
  border-radius: 8px;
  background: rgba(7, 32, 50, .28);
  padding: 4px;
  box-shadow: 0 12px 26px rgba(3, 25, 43, .16);
  backdrop-filter: blur(14px);
}

.auth-surface-tab {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 32px;
  border: 0;
  border-radius: 6px;
  padding: 0 12px;
  background: transparent;
  color: rgba(255, 255, 255, .78);
  cursor: pointer;
  font-size: 13px;
  font-weight: 850;
  font-family: inherit;
  text-decoration: none;
  white-space: nowrap;
  transition: background .16s ease, color .16s ease, transform .16s ease;
}

.auth-surface-tab:hover {
  color: #fff;
  background: rgba(255, 255, 255, .1);
  transform: translateY(-1px);
}

.auth-surface-tab.is-active {
  background: #fff;
  color: var(--auth-blue-deep);
  box-shadow: 0 8px 18px rgba(3, 25, 43, .12);
}

.unified-auth-card {
  display: grid;
  grid-template-columns: minmax(330px, .82fr) minmax(430px, 1fr);
  width: min(90vw, 1080px);
  min-height: clamp(460px, 60vh, 560px);
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, .42);
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 28px 70px rgba(3, 25, 43, .34);
  color: var(--auth-ink);
  text-align: left;
  animation: authFadeUp .55s ease both;
}

.unified-auth-media {
  position: relative;
  min-height: 100%;
  background:
    linear-gradient(180deg, rgba(5, 28, 45, .06), rgba(5, 28, 45, .16)),
    url('/static/btb/images/premium-corporate-lounge.webp') center / cover no-repeat;
}

.unified-auth-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 42%, rgba(5, 28, 45, .16));
}

.unified-auth-panel {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: clamp(28px, 3.4vw, 44px);
  background: #fff;
}

.unified-auth-logo {
  display: block;
  width: 96px;
  height: auto;
  margin: 0 auto 20px;
  object-fit: contain;
}

.unified-auth-eyebrow {
  margin: 0;
  color: var(--auth-blue);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: .16em;
  text-transform: uppercase;
  text-align: center;
}

.unified-auth-title {
  margin: 0;
  color: #1d2d3b;
  font-size: 36px;
  font-weight: 750;
  line-height: 1.08;
  letter-spacing: 0;
  text-align: center;
}

.unified-auth-copy {
  max-width: 460px;
  margin: 12px auto 0;
  color: #5d6c79;
  font-size: 14px;
  font-weight: 650;
  line-height: 1.55;
  text-align: center;
}

.unified-auth-alert {
  margin: 20px auto 0;
  border-radius: 8px;
  padding: 11px 13px;
  background: #fff1f2;
  border: 1px solid #fecaca;
  color: #b91c1c;
  font-size: 13px;
  font-weight: 800;
  text-align: left;
}

.unified-auth-alert.is-success {
  border-color: #bbf7d0;
  background: #f0fdf4;
  color: #15803d;
}

.unified-auth-form {
  margin: 24px auto 0;
  width: 100%;
  max-width: 530px;
}

.unified-auth-field-stack {
  display: grid;
  gap: 16px;
  text-align: left;
}

.unified-auth-field {
  display: block;
  position: relative;
}

.unified-auth-field:last-child {
  border-bottom: 0;
}

.unified-auth-label {
  display: block;
  margin-bottom: 8px;
  color: #5a6878;
  font-size: 15px;
  font-weight: 650;
}

.unified-auth-input {
  width: 100%;
  height: 56px;
  border: 1px solid #cad6df;
  border-radius: 8px;
  outline: 0;
  box-sizing: border-box;
  padding: 0 17px;
  background: #fff;
  color: var(--auth-ink);
  font-size: 16px;
  letter-spacing: 0;
  transition: border-color .16s ease, box-shadow .16s ease;
}

.unified-auth-input::placeholder {
  color: #a0acb7;
  opacity: 1;
}

.unified-auth-input:focus {
  border-color: var(--auth-blue);
  box-shadow: 0 0 0 4px rgba(12, 111, 159, .13);
}

.unified-auth-password {
  padding-right: 58px;
}

.unified-auth-toggle {
  position: absolute;
  right: 10px;
  bottom: 10px;
  border: 0;
  border-radius: 8px;
  width: 40px;
  height: 40px;
  padding: 0;
  background: transparent;
  color: #8a99a7;
  cursor: pointer;
  font-size: 0;
  font-weight: 800;
}

.unified-auth-toggle::before {
  content: "";
  display: block;
  width: 21px;
  height: 21px;
  margin: 0 auto;
  background: currentColor;
  mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' fill='none' stroke='black' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M2 12s3.5-7 10-7 10 7 10 7-3.5 7-10 7S2 12 2 12Z'/%3E%3Ccircle cx='12' cy='12' r='3'/%3E%3C/svg%3E") center / contain no-repeat;
}

.unified-auth-toggle:hover {
  background: #eef5f8;
  color: var(--auth-blue-deep);
}

.unified-auth-submit,
.unified-auth-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-height: 54px;
  border-radius: 8px;
  font-size: 18px;
  font-weight: 750;
  line-height: 1;
  text-align: center;
  transition: transform .16s ease, box-shadow .16s ease, background .16s ease;
}

.unified-auth-submit {
  margin-top: 22px;
  border: 0;
  background: #3b739d;
  color: #fff;
  box-shadow: 0 14px 28px rgba(37, 92, 130, .24);
}

.unified-auth-submit:hover {
  transform: translateY(-1px);
  background: #316789;
  box-shadow: 0 18px 36px rgba(37, 92, 130, .3);
}

.unified-auth-submit:disabled {
  cursor: not-allowed;
  opacity: .68;
  transform: none;
}

.unified-auth-links {
  margin-top: 18px;
  display: grid;
  gap: 12px;
  color: #647485;
  text-align: right;
}

.unified-auth-links a {
  color: #4d5d6b;
  font-weight: 650;
  text-decoration: underline;
  text-underline-offset: 4px;
}

.unified-auth-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  border: 1px solid rgba(255, 255, 255, .42);
  background: rgba(255, 255, 255, .96);
  color: var(--auth-ink);
  font-size: 15px;
  font-weight: 800;
  box-shadow: 0 14px 28px rgba(5, 34, 56, .16);
}

.unified-auth-secondary img {
  width: 24px;
  height: 24px;
  object-fit: contain;
}

.unified-auth-secondary:hover {
  transform: translateY(-1px);
}

@keyframes authFadeUp {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes authLightSweep {
  0%, 100% {
    opacity: .56;
    transform: translateX(-4%);
  }
  50% {
    opacity: .9;
    transform: translateX(4%);
  }
}

@media (max-height: 760px) and (min-width: 860px) {
  .unified-auth-page {
    padding-top: 14px;
    padding-bottom: 14px;
  }

  .unified-auth-card {
    min-height: 500px;
  }

  .unified-auth-panel {
    padding-top: 26px;
    padding-bottom: 26px;
  }

  .unified-auth-logo {
    width: 90px;
    margin-bottom: 18px;
  }
}

@media (max-width: 920px) {
  .unified-auth-page {
    justify-content: flex-start;
  }

  .unified-auth-nav {
    align-items: flex-start;
    flex-direction: column;
  }

  .auth-surface-tabs {
    width: 100%;
    overflow-x: auto;
  }

  .auth-surface-tab {
    flex: 1 0 auto;
  }

  .unified-auth-card {
    grid-template-columns: 1fr;
    width: min(94vw, 560px);
    min-height: auto;
  }

  .unified-auth-media {
    min-height: 132px;
  }
}

@media (max-width: 640px) {
  .unified-auth-page {
    padding: 16px;
  }

  .unified-auth-brand strong {
    font-size: 16px;
  }

  .unified-auth-brand span span {
    font-size: 12px;
  }

  .unified-auth-badge {
    min-height: 38px;
    padding: 0 12px;
    font-size: 13px;
  }

  .unified-auth-card {
    width: 100%;
  }

  .unified-auth-panel {
    padding: 22px 18px;
  }

  .unified-auth-logo {
    width: 82px;
    margin-bottom: 16px;
  }

  .unified-auth-title {
    font-size: 28px;
  }

  .unified-auth-copy {
    font-size: 13px;
  }

  .unified-auth-input {
    height: 54px;
  }

  .unified-auth-submit,
  .unified-auth-secondary {
    min-height: 50px;
    font-size: 16px;
  }
}

/* Final platform density layer */
html {
  font-size: 16px;
}

@media (min-width: 1180px) {
  html {
    font-size: 17px;
  }

  .unified-auth-nav {
    width: min(100%, 1220px);
  }

  .unified-auth-card {
    width: min(92vw, 1220px);
    grid-template-columns: minmax(390px, .86fr) minmax(470px, 1fr);
    min-height: clamp(520px, 65vh, 640px);
  }

  .unified-auth-input {
    height: 58px;
  }

  .unified-auth-submit {
    min-height: 58px;
  }
}

@media (min-width: 1536px) {
  html {
    font-size: 18px;
  }
}