:root {
  color-scheme: light;
  font-family: 'Inter', 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  line-height: 1.4;
}

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

body {
  margin: 0;
  background: radial-gradient(circle at top, rgba(233, 244, 241, 0.6), transparent 50%), #f7f7f7;
  min-height: 100vh;
  color: #0f172a;
}

a {
  color: inherit;
  text-decoration-color: #111;
  text-decoration-thickness: 2px;
}

site-header::part(root),
site-footer::part(root) {
  width: 100%;
}

.signin-shell {
  max-width: 560px;
  margin: 32px auto 140px;
  padding: 0 16px 80px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.signin-card {
  background: #fff;
  border-radius: 32px;
  border: 1px solid #e5e7eb;
  box-shadow: 0 25px 50px rgba(15, 23, 42, 0.08);
  padding: 32px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.card-header {
  text-align: left;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 2px;
  font-size: 12px;
  font-weight: 700;
  color: #10b981;
  margin-bottom: 4px;
}

#signin-heading {
  margin: 0 0 8px;
  font-size: clamp(28px, 5vw, 36px);
}

.subtitle {
  margin: 0;
  color: #4b5563;
}

.signin-form {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.field-control {
  position: relative;
  display: flex;
  align-items: center;
}

.field-control input {
  flex: 1;
  padding-right: 48px;
}

.field[data-invalid="true"] input {
  border-color: #b91c1c;
  box-shadow: 0 0 0 3px rgba(185, 28, 28, 0.12);
}

.toggle-visibility {
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  border: none;
  background: transparent;
  cursor: pointer;
  color: #4b5563;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 4px;
  border-radius: 999px;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.toggle-visibility:focus {
  outline: 2px solid rgba(15, 23, 42, 0.2);
}

.toggle-visibility:hover {
  background: rgba(15, 23, 42, 0.04);
  color: #111;
}

.toggle-visibility svg {
  width: 20px;
  height: 20px;
  pointer-events: none;
}

.toggle-visibility [data-icon="hide"] {
  display: none;
}

.toggle-visibility[data-visible="true"] [data-icon="show"] {
  display: none;
}

.toggle-visibility[data-visible="true"] [data-icon="hide"] {
  display: block;
}

.field-label {
  font-weight: 600;
}

.field input {
  height: 48px;
  border-radius: 14px;
  border: 1px solid #d1d5db;
  padding: 0 16px;
  font-size: 16px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.field input:focus {
  border-color: #111;
  box-shadow: 0 0 0 3px rgba(15, 23, 42, 0.1);
  outline: none;
}

.field-error {
  margin: 2px 0 0;
  font-size: 13px;
  color: #b91c1c;
  min-height: 1em;
  visibility: hidden;
}

.field-error[data-state="error"] {
  visibility: visible;
}

.form-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  font-size: 14px;
  color: #4b5563;
}

.forgot-row {
  margin: 6px 0 10px;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid #e5e7eb;
  background: #f9fafb;
}

.forgot-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.submit-button.ghost {
  background: #fff;
  color: #0f172a;
  border: 1px solid #e5e7eb;
  box-shadow: none;
}

.remember {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.remember input {
  width: 18px;
  height: 18px;
  border-radius: 6px;
  border: 1px solid #9ca3af;
}

.link.subtle {
  color: #0f172a;
  text-decoration-thickness: 1.5px;
}

.submit-button {
  border: none;
  border-radius: 16px;
  height: 52px;
  background: #111;
  color: #fff;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  transition: transform 0.2s ease, box-shadow 0.2s ease, opacity 0.2s ease;
}

.submit-button[disabled] {
  opacity: 0.6;
  cursor: wait;
}

.submit-button:hover:not([disabled]) {
  transform: translateY(-1px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

.signup-copy {
  margin: 0;
  text-align: center;
  color: #6b7280;
}

.form-feedback {
  min-height: 1.2em;
  font-size: 14px;
  text-align: center;
}

.form-feedback[data-state="error"] {
  color: #b91c1c;
}

.form-feedback[data-state="success"] {
  color: #059669;
}

.footer-spacer {
  height: 80px;
}

@media (max-width: 640px) {
  .signin-shell {
    margin-top: 16px;
    padding-bottom: 140px;
  }

  .signin-card {
    padding: 24px;
    border-radius: 24px;
  }

  .form-meta {
    flex-direction: column;
    align-items: flex-start;
  }
}