:root {
  --bg: #fafafa;
  --bg-soft: #f4f4f3;
  --surface: rgba(255, 255, 255, 0.96);
  --text: #141414;
  --text-muted: #6e6e73;
  --line: rgba(20, 20, 20, 0.08);
  --line-strong: rgba(20, 20, 20, 0.12);
  --shadow-soft: 0 18px 40px rgba(15, 15, 15, 0.04);
  --shadow-card: 0 10px 30px rgba(15, 15, 15, 0.035);
  --radius-xl: 18px;
  --radius-lg: 12px;
  --radius-md: 10px;
  --content-width: 1180px;
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100svh;
  background:
    radial-gradient(circle at top left, rgba(255, 255, 255, 0.82), transparent 34%),
    linear-gradient(180deg, #fbfbfa 0%, #f5f5f4 100%);
  color: var(--text);
  font-family: "Noto Sans JP", "Hiragino Sans", "Yu Gothic", sans-serif;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input {
  font: inherit;
}

.login-shell {
  width: min(calc(100% - 40px), var(--content-width));
  margin: 0 auto;
  min-height: 100vh;
  min-height: 100svh;
  padding: 0;
  display: grid;
  grid-template-rows: auto 1fr;
}

.login-header {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 18px;
  min-height: 60px;
  margin-bottom: 0;
  padding: 0 4px;
}

.login-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.login-brand-mark {
  width: 28px;
  height: 28px;
  border-radius: 6px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  border: 1px solid rgba(20, 20, 20, 0.12);
}

.login-brand-mark img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
}

.login-brand-name {
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.025em;
  color: rgba(20, 20, 20, 0.8);
}

.auth-google-button,
.auth-primary-button,
.login-primary-link,
.login-secondary-link {
  min-height: 44px;
  padding: 0 16px;
  border-radius: var(--radius-lg);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background-color 160ms ease, border-color 160ms ease, box-shadow 160ms ease, transform 160ms ease;
}

.auth-google-button,
.login-secondary-link {
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.96);
  color: var(--text);
  box-shadow: 0 1px 2px rgba(15, 15, 15, 0.03);
}

.auth-primary-button,
.login-primary-link {
  border: 1px solid #202020;
  background: #1c1c1e;
  color: #ffffff;
  box-shadow: 0 8px 20px rgba(15, 15, 15, 0.08);
}

.auth-google-button:hover,
.auth-google-button:focus-visible,
.auth-primary-button:hover,
.auth-primary-button:focus-visible,
.login-primary-link:hover,
.login-primary-link:focus-visible,
.login-secondary-link:hover,
.login-secondary-link:focus-visible {
  transform: translateY(-1px);
}

.auth-google-button:hover,
.login-secondary-link:hover {
  background: #ffffff;
  border-color: var(--line-strong);
}

.auth-primary-button:hover,
.login-primary-link:hover {
  background: #101010;
}

.auth-google-button:focus-visible,
.auth-primary-button:focus-visible,
.login-primary-link:focus-visible,
.login-secondary-link:focus-visible,
.login-mode-link:focus-visible,
.auth-field input:focus-visible {
  outline: none;
  box-shadow: 0 0 0 4px rgba(20, 20, 20, 0.08);
}

.login-main {
  display: grid;
}

.login-stage {
  min-height: 0;
  display: grid;
  place-items: center;
  align-content: center;
  gap: 14px;
  padding: 0 0 clamp(44px, 8vh, 76px);
}

.login-install-card {
  width: min(100%, 448px);
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 16px;
  border: 1px solid rgba(20, 20, 20, 0.09);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: 0 10px 28px rgba(15, 23, 42, 0.035);
}

.login-install-card:not([hidden]) {
  display: flex;
}

.login-install-title {
  margin: 0;
  color: #172033;
  font-size: 0.82rem;
  font-weight: 650;
}

.login-install-copy {
  margin: 5px 0 0;
  color: var(--text-muted);
  font-size: 0.72rem;
  line-height: 1.65;
}

.login-install-actions {
  display: grid;
  justify-items: end;
  flex: 0 0 auto;
  gap: 3px;
}

.login-install-actions button {
  border: 0;
  background: transparent;
  cursor: pointer;
}

.login-install-actions button:first-child {
  min-height: 34px;
  padding: 0 11px;
  border: 1px solid rgba(39, 77, 129, 0.18);
  border-radius: 9px;
  background: #fff;
  color: #203957;
  font-size: 0.72rem;
  font-weight: 650;
}

.login-install-actions button:last-child {
  padding: 5px 7px;
  color: var(--text-muted);
  font-size: 0.68rem;
}

.login-install-backdrop {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  background: rgba(15, 23, 42, 0.25);
}

.login-install-dialog {
  position: relative;
  width: 100%;
  max-height: min(88svh, 640px);
  overflow-y: auto;
  padding: 24px 20px calc(20px + env(safe-area-inset-bottom));
  border: 1px solid rgba(20, 20, 20, 0.1);
  border-radius: 24px 24px 0 0;
  background: #fff;
  box-shadow: 0 -18px 55px rgba(15, 23, 42, 0.16);
  outline: none;
}

.login-install-dialog-close {
  position: absolute;
  top: 14px;
  right: 14px;
  width: 32px;
  height: 32px;
  border: 0;
  border-radius: 9px;
  background: transparent;
  color: #7a7f89;
  font-size: 1.15rem;
  cursor: pointer;
}

.login-install-kicker {
  margin: 0 0 8px;
  color: #9095a0;
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.login-install-dialog h2 {
  margin: 0;
  padding-right: 34px;
  color: #172033;
  font-size: 1.12rem;
}

.login-install-dialog > p:not(.login-install-kicker) {
  margin: 8px 0 0;
  color: var(--text-muted);
  font-size: 0.8rem;
  line-height: 1.8;
}

.login-install-steps,
.login-install-panel {
  margin: 20px 0;
  padding: 15px;
  border: 1px solid rgba(20, 20, 20, 0.08);
  border-radius: 12px;
  background: #fafafa;
  color: #424956;
  font-size: 0.8rem;
  line-height: 1.7;
}

.login-install-steps {
  display: grid;
  gap: 10px;
  list-style: none;
}

.login-install-steps li {
  display: flex;
  gap: 10px;
}

.login-install-note {
  margin: -10px 0 18px;
  color: var(--text-muted);
  font-size: 0.7rem;
  line-height: 1.7;
}

.login-install-dialog-actions {
  display: grid;
  gap: 8px;
  margin-top: 20px;
}

.login-install-dialog-actions button {
  min-height: 42px;
  border-radius: 11px;
  font-size: 0.8rem;
  font-weight: 650;
  cursor: pointer;
}

.login-install-primary {
  border: 1px solid #172033;
  background: #172033;
  color: #fff;
}

.login-install-secondary {
  border: 1px solid var(--line-strong);
  background: #fff;
  color: #303743;
}

.login-install-tertiary {
  border: 0;
  background: transparent;
  color: var(--text-muted);
}

.login-install-actions button:focus-visible,
.login-install-dialog button:focus-visible {
  outline: none;
  box-shadow: 0 0 0 4px rgba(39, 77, 129, 0.12);
}

@media (min-width: 641px) {
  .login-install-card {
    display: none !important;
  }

  .login-install-backdrop {
    align-items: center;
    padding: 20px;
  }

  .login-install-dialog {
    max-width: 440px;
    padding: 24px;
    border-radius: 18px;
  }
}

.login-card {
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background: var(--surface);
  box-shadow: var(--shadow-card);
}

.login-kicker,
.login-card-kicker {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.login-card h1,
.login-card h2 {
  margin: 0;
  letter-spacing: -0.04em;
}

.login-card h1 {
  font-size: clamp(1.9rem, 3vw, 2.35rem);
  line-height: 1.08;
}

.login-card-head p,
.auth-helper,
.login-support-row,
.account-label,
.account-note,
.login-support-note {
  margin: 0;
  color: var(--text-muted);
  line-height: 1.7;
}

.login-card {
  width: min(100%, 448px);
  padding: 22px 22px 18px;
  display: grid;
  gap: 12px;
}

.login-card-head {
  display: grid;
  gap: 8px;
  text-align: center;
}

.auth-status {
  padding: 10px 12px;
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  line-height: 1.5;
}

.auth-status.is-error {
  background: rgba(191, 69, 69, 0.06);
  color: #9b3e3e;
  border: 1px solid rgba(191, 69, 69, 0.12);
}

.auth-status.is-success {
  background: rgba(38, 117, 72, 0.07);
  color: #2d6a48;
  border: 1px solid rgba(38, 117, 72, 0.12);
}

.auth-status.is-info {
  background: rgba(48, 93, 170, 0.07);
  color: #315487;
  border: 1px solid rgba(48, 93, 170, 0.13);
}

.login-auth-logged-in,
.login-auth-logged-out {
  display: grid;
  gap: 10px;
}

.login-google-button,
.login-submit-button,
.auth-logout-button {
  width: 100%;
}

.login-google-button {
  gap: 10px;
  font-weight: 600;
}

.login-google-icon {
  width: 18px;
  height: 18px;
  flex: 0 0 auto;
}

.login-divider {
  position: relative;
  display: grid;
  justify-items: center;
}

.login-divider::before {
  content: "";
  position: absolute;
  inset: 50% 0 auto;
  height: 1px;
  background: var(--line);
}

.login-divider span {
  position: relative;
  padding: 0 12px;
  background: rgba(255, 255, 255, 0.96);
  color: var(--text-muted);
  font-size: 0.82rem;
}

.auth-form {
  display: grid;
  gap: 9px;
}

.auth-field {
  display: grid;
  gap: 6px;
}

.auth-field span {
  font-size: 0.88rem;
  font-weight: 600;
  color: rgba(20, 20, 20, 0.82);
}

.auth-field input {
  width: 100%;
  min-height: 44px;
  padding: 0 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--bg-soft);
  color: var(--text);
  outline: none;
}

.auth-field input:focus {
  border-color: rgba(20, 20, 20, 0.16);
  background: #ffffff;
}

.auth-form-inline-action {
  display: flex;
  justify-content: flex-end;
  margin-top: -3px;
}

.login-forgot-link {
  color: var(--text-muted);
  font-size: 0.82rem;
}

.auth-google-button:disabled,
.auth-primary-button:disabled,
.login-mode-link:disabled,
.auth-field input:disabled {
  cursor: not-allowed;
  opacity: 0.58;
  transform: none;
}

.auth-google-button[aria-busy="true"],
.auth-form[aria-busy="true"] .auth-primary-button {
  position: relative;
}

.account-card {
  padding: 16px;
  border-radius: 14px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(249, 249, 248, 0.98));
  border: 1px solid var(--line);
}

.account-email {
  margin: 0;
  word-break: break-word;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
}

.account-note {
  font-size: 0.84rem;
}

.login-account-actions {
  display: grid;
  gap: 8px;
}

.login-mode-switch {
  margin: 0;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 6px;
  color: var(--text-muted);
  font-size: 0.84rem;
}

.login-mode-link {
  border: 0;
  padding: 0;
  background: transparent;
  color: var(--text);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

.login-support-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 6px;
  font-size: 0.82rem;
  text-align: center;
}

.login-support-link {
  color: var(--text-muted);
  font-weight: 500;
}

.login-support-note {
  text-align: center;
  font-size: 0.76rem;
}

@media (max-width: 899px) {
  .login-stage {
    min-height: auto;
    padding: 0 0 clamp(28px, 6vh, 52px);
  }
}

@media (max-width: 640px) {
  .login-shell {
    width: min(calc(100% - 24px), 720px);
  }

  .login-header {
    align-items: center;
    min-height: 52px;
  }

  .login-card {
    padding: 20px 18px 18px;
    border-radius: 16px;
  }

  .login-stage {
    padding: 0 0 clamp(20px, 5vh, 42px);
  }

  .auth-google-button,
  .auth-primary-button,
  .login-primary-link,
  .login-secondary-link {
    min-height: 44px;
  }
}