:root {
  --global-bg: #f5f7fb;
  --global-bg-strong: #e7ecf4;
  --global-text: #17191f;
  --global-muted: #697386;
  --global-panel: rgba(255, 255, 255, 0.92);
  --global-panel-solid: #ffffff;
  --global-border: rgba(25, 30, 40, 0.12);
  --global-accent: #0ea5a4;
  --global-accent-strong: #0f766e;
  --global-danger: #dc2626;
  --global-shadow: 0 16px 48px rgba(15, 23, 42, 0.14);
  color-scheme: light;
}

[data-theme="dark"] {
  --global-bg: #111318;
  --global-bg-strong: #191d25;
  --global-text: #f3f5f7;
  --global-muted: #a8b0bf;
  --global-panel: rgba(28, 32, 41, 0.92);
  --global-panel-solid: #1c2029;
  --global-border: rgba(255, 255, 255, 0.14);
  --global-accent: #2dd4bf;
  --global-accent-strong: #5eead4;
  --global-danger: #fb7185;
  --global-shadow: 0 18px 60px rgba(0, 0, 0, 0.34);
  color-scheme: dark;
}

.global-header {
  position: fixed;
  top: 0;
  right: 0;
  left: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  padding: 12px clamp(16px, 4vw, 40px);
  background: color-mix(in srgb, var(--global-panel) 88%, transparent);
  border-bottom: 1px solid var(--global-border);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.global-brand {
  color: var(--global-text);
  font-size: 1rem;
  font-weight: 800;
  text-decoration: none;
}

.global-header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 38px;
}

.global-login-btn,
.global-logout-btn {
  border: 1px solid var(--global-border);
  border-radius: 8px;
  background: var(--global-panel-solid);
  color: var(--global-text);
  cursor: pointer;
  font: inherit;
  font-size: 0.9rem;
  font-weight: 700;
  min-height: 38px;
  padding: 0 14px;
}

.global-login-btn {
  align-items: center;
  display: inline-flex;
  gap: 6px;
}

.global-login-btn:disabled,
.global-logout-btn:disabled {
  cursor: wait;
  opacity: 0.72;
}

.global-login-error {
  color: var(--global-danger);
  font-size: 0.78rem;
  max-width: 220px;
}

.global-account {
  align-items: center;
  color: var(--global-text);
  display: inline-flex;
  font-size: 0.9rem;
  font-weight: 700;
  gap: 8px;
}

.global-account-avatar {
  border-radius: 50%;
  height: 30px;
  width: 30px;
}

.theme-toggle {
  align-items: center;
  background: var(--global-panel-solid);
  border: 1px solid var(--global-border);
  border-radius: 50%;
  bottom: 22px;
  box-shadow: var(--global-shadow);
  color: var(--global-text);
  cursor: pointer;
  display: flex;
  font: inherit;
  font-size: 1.2rem;
  height: 46px;
  justify-content: center;
  position: fixed;
  right: 22px;
  width: 46px;
  z-index: 60;
}

.theme-toggle:hover,
.global-login-btn:hover,
.global-logout-btn:hover {
  border-color: var(--global-accent);
}

@media (max-width: 640px) {
  .global-header {
    min-height: 58px;
    padding: 10px 14px;
  }

  .global-brand {
    font-size: 0.92rem;
  }

  .global-account span {
    display: none;
  }

  .global-login-error {
    display: none;
  }
}