:root {
  --signin-bg: #14120b;
  --signin-surface: #1b1913;
  --signin-border: #2a2720;
  --signin-text: #edecec;
  --signin-muted: #8b8680;
  --signin-focus: #c4a574;
  --signin-btn: #26241e;
  --signin-btn-hover: #302d26;
  --signin-font: "Segoe UI", system-ui, -apple-system, sans-serif;
}

* { box-sizing: border-box; }

body.signin-page {
  margin: 0;
  min-height: 100vh;
  font-family: var(--signin-font);
  background: var(--signin-bg);
  color: var(--signin-text);
}

.signin-shell {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem 1.25rem;
}

.signin-card {
  width: 100%;
  max-width: 420px;
}

.signin-header {
  text-align: center;
  margin-bottom: 2rem;
}

.signin-title {
  margin: 0;
  font-size: 1.75rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.signin-subtitle {
  margin: 0.5rem 0 0;
  color: var(--signin-muted);
  font-size: 0.95rem;
}

.signin-oauth {
  display: grid;
  gap: 0.65rem;
  margin-bottom: 1.5rem;
}

.signin-oauth-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.65rem;
  width: 100%;
  padding: 0.85rem 1rem;
  border: 1px solid var(--signin-border);
  border-radius: 10px;
  background: var(--signin-btn);
  color: var(--signin-text);
  font: inherit;
  font-size: 0.92rem;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, opacity 0.15s;
}

.signin-oauth-btn:not(:disabled):hover {
  background: var(--signin-btn-hover);
  border-color: #3a3630;
}

.signin-oauth-btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.signin-oauth-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.signin-form {
  display: grid;
  gap: 0.5rem;
}

.signin-label {
  font-size: 0.82rem;
  color: var(--signin-muted);
  margin-top: 0.25rem;
}

.signin-input {
  width: 100%;
  padding: 0.85rem 0.95rem;
  border: 1px solid var(--signin-border);
  border-radius: 10px;
  background: var(--signin-surface);
  color: var(--signin-text);
  font: inherit;
  font-size: 0.92rem;
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.signin-input::placeholder {
  color: #5c5852;
}

.signin-input:focus {
  border-color: var(--signin-focus);
  box-shadow: 0 0 0 1px var(--signin-focus);
}

.signin-password-wrap {
  display: grid;
  gap: 0.5rem;
}

.signin-submit-wrap {
  position: relative;
  margin-top: 0.75rem;
}

.signin-submit {
  width: 100%;
  padding: 0.85rem 1rem;
  border: 1px solid var(--signin-border);
  border-radius: 10px;
  background: var(--signin-btn);
  color: var(--signin-text);
  font: inherit;
  font-size: 0.92rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}

.signin-submit:hover:not(:disabled) {
  background: var(--signin-btn-hover);
  border-color: #3a3630;
}

.signin-submit:disabled {
  opacity: 0.6;
  cursor: wait;
}

.signin-last-used {
  position: absolute;
  right: 0.65rem;
  bottom: -0.55rem;
  padding: 0.15rem 0.45rem;
  border-radius: 999px;
  background: #0a0908;
  border: 1px solid var(--signin-border);
  color: var(--signin-muted);
  font-size: 0.68rem;
  line-height: 1.2;
  pointer-events: none;
}

.signin-error {
  margin: 1rem 0 0;
  padding: 0.65rem 0.85rem;
  border-radius: 8px;
  background: rgba(240, 113, 120, 0.12);
  border: 1px solid rgba(240, 113, 120, 0.35);
  color: #f07178;
  font-size: 0.85rem;
  text-align: center;
}

.signin-warning {
  margin: 1rem 0 0;
  padding: 0.65rem 0.85rem;
  border-radius: 8px;
  background: rgba(245, 199, 110, 0.1);
  border: 1px solid rgba(245, 199, 110, 0.35);
  color: #f5c76e;
  font-size: 0.85rem;
  text-align: center;
}

.signin-footer {
  margin-top: 2rem;
  text-align: center;
  color: var(--signin-muted);
  font-size: 0.88rem;
}

.signin-link {
  margin-left: 0.35rem;
  padding: 0;
  border: 0;
  background: none;
  color: var(--signin-text);
  font: inherit;
  font-size: inherit;
  cursor: pointer;
  text-decoration: none;
}

.signin-link:hover {
  text-decoration: underline;
}

@media (max-width: 480px) {
  .signin-title {
    font-size: 1.5rem;
  }
}