:root {
  color-scheme: dark;
  font-family: "Nunito", "Noto Sans JP", ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont,
    "Segoe UI", sans-serif;
  --auth-ink: var(--tsumu-text);
  --auth-muted: var(--tsumu-muted);
  --auth-primary: var(--tsumu-accent);
  --auth-primary-dark: var(--tsumu-accent-dark);
  --auth-border: var(--tsumu-border);
  --auth-danger: #FCA5A5;
  --auth-success: #86EFAC;
}

* {
  box-sizing: border-box;
}

body.tsumu-auth-page {
  margin: 0;
  min-height: 100vh;
  color: var(--auth-ink);
  background:
    radial-gradient(circle at 15% 15%, rgba(255, 194, 51, 0.12) 0, transparent 35%),
    linear-gradient(160deg, var(--tsumu-bg), var(--tsumu-surface-soft));
}

.tsumu-auth-shell {
  width: min(100% - 32px, 560px);
  margin: 0 auto;
  padding: 48px 0;
}

.tsumu-auth-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 22px;
  color: inherit;
  text-decoration: none;
}

.tsumu-auth-brand img {
  border-radius: 16px;
}

.tsumu-auth-brand span {
  display: grid;
}

.tsumu-auth-brand strong {
  font-size: 1.25rem;
}

.tsumu-auth-brand small,
.tsumu-auth-footer,
.tsumu-auth-intro,
.tsumu-auth-form small,
.tsumu-session-list small {
  color: var(--auth-muted);
}

.tsumu-auth-card {
  padding: clamp(24px, 6vw, 42px);
  border: 1px solid rgba(229, 226, 240, 0.9);
  border-radius: 28px;
  background: color-mix(in srgb, var(--tsumu-surface) 92%, transparent);
  box-shadow: 0 22px 70px rgba(15, 23, 42, 0.12);
}

.tsumu-auth-card h1 {
  margin: 6px 0 24px;
  font-size: clamp(1.8rem, 6vw, 2.45rem);
  line-height: 1.08;
}

.tsumu-auth-eyebrow {
  color: var(--auth-primary);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.tsumu-auth-form {
  display: grid;
  gap: 17px;
}

.tsumu-auth-form label {
  display: grid;
  gap: 7px;
  font-weight: 700;
}

.tsumu-auth-form input {
  width: 100%;
  min-height: 48px;
  padding: 11px 13px;
  border: 1px solid var(--auth-border);
  border-radius: 12px;
  color: var(--auth-ink);
  background: var(--tsumu-surface);
  font: inherit;
}

.tsumu-auth-form input:focus {
  border-color: var(--auth-primary);
  outline: 3px solid rgba(255, 194, 51, 0.16);
}

.tsumu-auth-form button,
.tsumu-auth-inline-form button,
.tsumu-session-list button {
  min-height: 46px;
  padding: 10px 18px;
  border: 0;
  border-radius: 12px;
  color: #fff;
  background: var(--auth-primary);
  font: inherit;
  font-weight: 800;
  cursor: pointer;
}

.tsumu-auth-form button:hover,
.tsumu-auth-inline-form button:hover {
  background: var(--auth-primary-dark);
}

.tsumu-auth-form button:disabled {
  cursor: not-allowed;
  opacity: 0.55;
}

.tsumu-auth-links,
.tsumu-auth-switch {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px;
  margin: 20px 0 0;
}

.tsumu-auth-card a {
  color: var(--auth-primary-dark);
  font-weight: 700;
}

.tsumu-auth-notice {
  margin: 0 0 18px;
  padding: 13px 15px;
  border-radius: 12px;
  color: var(--auth-ink);
  background: var(--tsumu-surface-soft);
}

.tsumu-auth-notice.is-error {
  color: var(--auth-danger);
  background: color-mix(in srgb, var(--tsumu-danger) 12%, var(--tsumu-surface));
}

.tsumu-auth-notice.is-success {
  color: var(--auth-success);
  background: #ebf8f2;
}

.tsumu-auth-inline-form {
  margin-top: 18px;
}

.tsumu-auth-footer {
  margin-top: 22px;
  text-align: center;
  font-size: 0.85rem;
}

.tsumu-account-summary {
  display: grid;
  gap: 3px;
  margin-bottom: 20px;
  padding: 15px;
  border-radius: 14px;
  background: var(--tsumu-surface-soft);
}

.tsumu-provider-actions {
  display: grid;
  gap: 10px;
  margin-bottom: 18px;
}

.tsumu-provider-button {
  display: flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  padding: 10px 16px;
  border: 1px solid var(--auth-border);
  border-radius: 12px;
  text-decoration: none;
  background: var(--tsumu-surface);
}

.tsumu-auth-divider {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 18px 0;
  color: var(--auth-muted);
  font-size: 0.82rem;
}

.tsumu-auth-divider::before,
.tsumu-auth-divider::after {
  height: 1px;
  flex: 1;
  content: "";
  background: var(--auth-border);
}

.tsumu-provider-settings {
  margin: 24px 0;
}

.tsumu-provider-settings h2 {
  font-size: 1.05rem;
}

.tsumu-provider-settings article {
  display: grid;
  gap: 12px;
  padding: 15px 0;
  border-top: 1px solid var(--auth-border);
}

.tsumu-provider-settings article > div {
  display: grid;
  gap: 3px;
}

.tsumu-provider-settings small {
  color: var(--auth-muted);
}

.tsumu-provider-connect,
.tsumu-provider-remove {
  display: grid;
  gap: 10px;
}

.tsumu-provider-connect {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--auth-border);
}

.tsumu-provider-connect label,
.tsumu-provider-remove label {
  display: grid;
  gap: 5px;
}

.tsumu-provider-connect input,
.tsumu-provider-remove input {
  min-height: 42px;
  padding: 9px 11px;
  border: 1px solid var(--auth-border);
  border-radius: 10px;
}

.tsumu-provider-remove button {
  color: var(--auth-danger);
  background: color-mix(in srgb, var(--tsumu-danger) 12%, var(--tsumu-surface));
}

.tsumu-account-summary span {
  color: var(--auth-muted);
}

.tsumu-auth-card details {
  margin: 16px 0;
  padding: 15px;
  border: 1px solid var(--auth-border);
  border-radius: 14px;
}

.tsumu-auth-card summary {
  cursor: pointer;
  font-weight: 800;
}

.tsumu-auth-card details .tsumu-auth-form {
  margin-top: 16px;
}

.tsumu-session-list {
  margin-top: 28px;
}

.tsumu-session-list article {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 13px 0;
  border-top: 1px solid var(--auth-border);
}

.tsumu-session-list article div {
  display: grid;
  gap: 3px;
}

.tsumu-session-list article button {
  min-height: 38px;
  color: var(--auth-danger);
  background: color-mix(in srgb, var(--tsumu-danger) 12%, var(--tsumu-surface));
}

@media (max-width: 560px) {
  .tsumu-auth-shell {
    width: min(100% - 20px, 560px);
    padding: 20px 0 32px;
  }

  .tsumu-auth-card {
    border-radius: 20px;
  }

  .tsumu-auth-links,
  .tsumu-auth-switch {
    display: grid;
  }
}