/* Sign In page — premium dark theme */
:root {
  --si-bg-deep: var(--dvc-bg-dark);
  --si-navy: var(--dvc-bg-secondary);
  --si-navy-mid: var(--dvc-card-bg);
  --si-card-bg: rgba(33, 21, 44, 0.96);
  --si-gold: var(--dvc-soft-purple);
  --si-gold-light: var(--dvc-soft-purple);
  --si-gold-dark: var(--dvc-primary);
  --si-gold-border: rgba(168, 85, 247, 0.50);
  --si-white: var(--dvc-text-light);
  --si-muted: var(--dvc-text-muted);
  --si-input-bg: rgba(13, 7, 18, 0.74);
  --si-input-border: rgba(168, 85, 247, 0.38);
  --si-radius: 14px;
  --si-card-radius: 16px;
}

html.si-page-root,
body.si-page {
  margin: 0;
  padding: 0;
  min-height: 100vh;
  font-family: Arial, Helvetica, sans-serif;
  color: var(--si-white);
  background: var(--si-bg-deep);
  overflow-x: hidden;
}

/* Background */
.si-bg {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(ellipse 68% 52% at 50% 46%, rgba(33, 21, 44, 0.88) 0%, transparent 70%),
    linear-gradient(180deg, var(--dvc-bg-dark) 0%, var(--dvc-bg-secondary) 46%, var(--dvc-card-bg) 72%, var(--dvc-bg-dark) 100%);
  opacity: 0;
  transition: opacity 1s ease;
}

.si-bg.is-visible {
  opacity: 1;
}

.si-deco {
  position: absolute;
  pointer-events: none;
}

.si-deco--glow {
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: min(520px, 88vw);
  height: 420px;
  background: radial-gradient(ellipse, rgba(33, 21, 44, 0.75) 0%, transparent 72%);
  opacity: 0.9;
}

.si-deco--curve-tl {
  top: 0;
  left: 0;
  width: 340px;
  height: 260px;
  opacity: 0;
  transition: opacity 1.1s ease 0.15s;
}

.si-deco--curve-br {
  bottom: 0;
  right: 0;
  width: 360px;
  height: 280px;
  opacity: 0;
  transition: opacity 1.1s ease 0.25s;
}

.si-bg.is-visible .si-deco--curve-tl,
.si-bg.is-visible .si-deco--curve-br {
  opacity: 1;
}

.si-deco--curve-tl svg,
.si-deco--curve-br svg {
  width: 100%;
  height: 100%;
}

.si-deco--dots-tl {
  top: 36px;
  left: 42px;
  width: 72px;
  height: 72px;
  background-image: radial-gradient(rgba(168, 85, 247, 0.5) 1.5px, transparent 1.5px);
  background-size: 9px 9px;
  opacity: 0;
  transition: opacity 1s ease 0.35s;
}

.si-deco--dots-br {
  bottom: 48px;
  right: 52px;
  width: 64px;
  height: 64px;
  background-image: radial-gradient(rgba(168, 85, 247, 0.42) 1.5px, transparent 1.5px);
  background-size: 8px 8px;
  opacity: 0;
  transition: opacity 1s ease 0.45s;
}

.si-bg.is-visible .si-deco--dots-tl,
.si-bg.is-visible .si-deco--dots-br {
  opacity: 0.38;
}

.si-deco--spark {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--si-gold-light);
  box-shadow: 0 0 8px rgba(168, 85, 247, 0.85);
  opacity: 0;
  transition: opacity 0.8s ease;
}

.si-bg.is-visible .si-deco--spark {
  opacity: 0.75;
}

.si-deco--spark-1 { top: 18%; left: 12%; transition-delay: 0.5s; }
.si-deco--spark-2 { top: 28%; left: 8%; transition-delay: 0.65s; }
.si-deco--spark-3 { bottom: 22%; right: 14%; transition-delay: 0.55s; }
.si-deco--spark-4 { bottom: 32%; right: 9%; transition-delay: 0.7s; }

/* Shell */
.si-shell {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 24px 20px;
  box-sizing: border-box;
}

/* Card */
.si-card {
  width: 100%;
  max-width: 440px;
  padding: 32px 34px 28px;
  background: var(--si-card-bg);
  border: 1px solid var(--si-gold-border);
  border-radius: var(--si-card-radius);
  box-shadow:
    0 18px 48px rgba(13, 7, 18, 0.55),
    0 0 36px rgba(168, 85, 247, 0.08),
    inset 0 1px 0 rgba(255, 255, 255, 0.04);
  position: relative;
  overflow: hidden;
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s ease 0.1s, transform 0.7s ease 0.1s;
}

.si-card,
.si-card *,
.si-card *::before,
.si-card *::after {
  box-sizing: border-box;
}

.si-card.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.si-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 8%;
  right: 8%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(168, 85, 247, 0.65), transparent);
  pointer-events: none;
}

/* Logo */
.si-logo {
  display: block;
  height: 52px;
  width: auto;
  margin: 0 auto 18px;
  opacity: 0;
  transform: translateY(-10px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

.si-logo.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Heading */
.si-title {
  margin: 0 0 14px;
  font-size: clamp(1.35rem, 3.2vw, 1.55rem);
  font-weight: 600;
  line-height: 1.25;
  text-align: center;
  color: var(--si-white);
  letter-spacing: 0.01em;
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

.si-title.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.si-divider {
  display: flex;
  align-items: center;
  margin-bottom: 14px;
  opacity: 0;
  transition: opacity 0.5s ease;
}

.si-divider.is-visible {
  opacity: 1;
}

.si-divider::before,
.si-divider::after {
  content: "";
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(168, 85, 247, 0.55));
}

.si-divider::after {
  background: linear-gradient(90deg, rgba(168, 85, 247, 0.55), transparent);
}

.si-divider span {
  width: 5px;
  height: 5px;
  margin: 0 10px;
  background: var(--si-gold);
  transform: rotate(45deg);
  flex-shrink: 0;
  box-shadow: 0 0 6px rgba(168, 85, 247, 0.5);
}

.si-subtitle {
  margin: 0 0 24px;
  font-size: 0.875rem;
  line-height: 1.55;
  text-align: center;
  color: var(--si-muted);
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

.si-subtitle.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Alerts */
.si-alert {
  border-radius: 10px;
  padding: 11px 14px;
  margin-bottom: 18px;
  font-size: 0.8125rem;
  line-height: 1.45;
  display: flex;
  align-items: flex-start;
  gap: 8px;
  animation: siSlideDown 0.35s ease-out;
}

@keyframes siSlideDown {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.si-alert i {
  margin-top: 2px;
  flex-shrink: 0;
}

.si-alert--danger {
  background: rgba(225, 29, 72, 0.18);
  color: #FDA4AF;
  border: 1px solid rgba(225, 29, 72, 0.35);
}

.si-alert--warning {
  background: rgba(180, 120, 20, 0.15);
  color: var(--dvc-soft-purple);
  border: 1px solid rgba(168, 85, 247, 0.35);
}

/* Form */
#signinForm {
  width: 100%;
  margin: 0;
  padding: 0;
}

.si-form-group {
  width: 100%;
  margin-bottom: 20px;
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.si-form-group.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.si-label {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
  font-size: 0.875rem;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.94);
}

.si-label i {
  font-size: 0.8rem;
  color: var(--si-gold);
  width: 16px;
  text-align: center;
}

.si-input-wrap {
  position: relative;
  width: 100%;
  display: block;
}

.si-input {
  box-sizing: border-box;
  display: block;
  width: 100%;
  max-width: 100%;
  margin: 0;
  padding: 13px 16px;
  padding-left: 18px;
  border: 1px solid var(--si-input-border);
  border-left: 3px solid rgba(168, 85, 247, 0.75);
  border-radius: var(--si-radius);
  font-size: 0.9375rem;
  font-family: inherit;
  color: var(--si-white);
  background: var(--si-input-bg);
  transition: border-color 0.25s ease, box-shadow 0.25s ease, background 0.25s ease;
}

.si-input::placeholder {
  color: rgba(184, 175, 194, 0.65);
}

.si-input:focus {
  outline: none;
  border-color: rgba(168, 85, 247, 0.85);
  border-left-color: var(--si-gold-light);
  background: rgba(23, 16, 32, 0.82);
  box-shadow: 0 0 0 3px rgba(168, 85, 247, 0.12);
}

.si-input-wrap--password .si-input {
  padding-right: 46px;
}

.si-password-toggle {
  position: absolute;
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  padding: 0;
  border: none;
  border-radius: 50%;
  background: transparent;
  color: var(--si-gold);
  cursor: pointer;
  transition: color 0.25s ease, background 0.25s ease;
}

.si-password-toggle:hover {
  color: var(--si-gold-light);
  background: rgba(168, 85, 247, 0.1);
}

.si-password-toggle i {
  font-size: 0.95rem;
  pointer-events: none;
}

/* Login button */
.si-btn-login {
  box-sizing: border-box;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  max-width: 100%;
  margin: 6px 0 0;
  padding: 14px 18px;
  border: none;
  border-radius: var(--si-radius);
  font-family: inherit;
  font-size: 0.9375rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--dvc-bg-secondary);
  background: linear-gradient(180deg, var(--dvc-soft-purple) 0%, var(--dvc-soft-purple) 48%, var(--dvc-primary) 100%);
  box-shadow: 0 10px 26px rgba(109, 40, 217, 0.38);
  cursor: pointer;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  opacity: 0;
  transform: translateY(12px);
}

.si-btn-login.is-visible {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.5s ease, transform 0.5s ease, box-shadow 0.3s ease;
}

.si-btn-login:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 14px 32px rgba(109, 40, 217, 0.48);
}

.si-btn-login:hover:not(:disabled) .si-btn-icon {
  transform: translateX(3px);
}

.si-btn-login:active:not(:disabled) {
  transform: translateY(0);
}

.si-btn-login:disabled {
  opacity: 0.75;
  cursor: not-allowed;
}

.si-btn-icon {
  font-size: 0.9rem;
  transition: transform 0.3s ease;
}

/* Sign up link */
.si-signup-divider {
  display: flex;
  align-items: center;
  margin: 22px 0 16px;
  opacity: 0;
  transition: opacity 0.5s ease;
}

.si-signup-divider.is-visible {
  opacity: 1;
}

.si-signup-divider::before,
.si-signup-divider::after {
  content: "";
  flex: 1;
  height: 1px;
  background: rgba(184, 175, 194, 0.18);
}

.si-signup-divider span {
  width: 6px;
  height: 6px;
  margin: 0 12px;
  border-radius: 50%;
  background: var(--si-gold-light);
  box-shadow: 0 0 10px rgba(168, 85, 247, 0.65);
  flex-shrink: 0;
}

.si-signup-link {
  text-align: center;
  font-size: 0.875rem;
  color: var(--si-muted);
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.si-signup-link.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.si-signup-link a {
  color: var(--si-gold-light);
  font-weight: 600;
  text-decoration: none;
  transition: color 0.25s ease;
}

.si-signup-link a:hover {
  color: var(--si-gold);
  text-decoration: underline;
}

.si-signup-link .si-login-options {
  display: inline-block;
  margin-top: 12px;
  font-size: 0.8125rem;
  color: rgba(184, 175, 194, 0.75);
}

.si-signup-link .si-login-options:hover {
  color: var(--si-gold-light);
}

/* Product mismatch modal */
.si-modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 10000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
  background: rgba(13, 7, 18, 0.72);
  backdrop-filter: blur(4px);
  animation: siFadeIn 0.2s ease-in;
}

.si-modal-overlay.active {
  display: flex;
}

@keyframes siFadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.si-modal-box {
  width: 100%;
  max-width: 480px;
  padding: 28px 26px;
  text-align: center;
  background: var(--si-card-bg);
  border: 1px solid var(--si-gold-border);
  border-radius: var(--si-card-radius);
  box-shadow: 0 18px 48px rgba(13, 7, 18, 0.6);
  animation: siModalUp 0.3s ease-out;
}

@keyframes siModalUp {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.si-modal-header i {
  font-size: 2.4rem;
  color: var(--si-gold);
  margin-bottom: 12px;
}

.si-modal-header h4 {
  margin: 0 0 10px;
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--si-white);
}

.si-modal-body p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.55;
  color: var(--si-muted);
}

.si-modal-footer {
  margin-top: 22px;
}

.si-modal-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border: none;
  border-radius: var(--si-radius);
  font-family: inherit;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--dvc-bg-secondary);
  background: linear-gradient(180deg, var(--dvc-soft-purple) 0%, var(--dvc-primary) 100%);
  cursor: pointer;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.si-modal-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 20px rgba(109, 40, 217, 0.4);
}

/* Tablet */
@media (max-width: 991.98px) {
  .si-card {
    max-width: 420px;
    padding: 28px 28px 24px;
  }
}

/* Mobile */
@media (max-width: 767.98px) {
  .si-shell {
    min-height: 100vh;
    padding: 20px 16px;
    align-items: center;
  }

  .si-card {
    max-width: none;
    padding: 26px 22px 22px;
  }

  .si-logo {
    height: 46px;
  }

  .si-deco--curve-tl {
    width: 220px;
    height: 180px;
    opacity: 0.6;
  }

  .si-deco--curve-br {
    width: 240px;
    height: 190px;
    opacity: 0.55;
  }

  .si-deco--dots-tl,
  .si-deco--dots-br {
    opacity: 0.25;
  }

  .si-modal-footer .si-modal-btn {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .si-bg,
  .si-card,
  .si-logo,
  .si-title,
  .si-divider,
  .si-subtitle,
  .si-form-group,
  .si-btn-login,
  .si-signup-divider,
  .si-signup-link,
  .si-deco--curve-tl,
  .si-deco--curve-br,
  .si-deco--dots-tl,
  .si-deco--dots-br,
  .si-deco--spark {
    opacity: 1;
    transform: none;
    transition: none;
  }
}