/* ——— Site-wide banner (above navbar) + alert popup ——— */

:root {
  --site-banner-height: 0px;
  --site-banner-bg: linear-gradient(90deg, #4c1d95 0%, #6d28d9 48%, #7c3aed 100%);
  --site-banner-fg: #f5f3ff;
  --site-banner-border: rgba(255, 255, 255, 0.12);
  --site-banner-chip-bg: rgba(255, 255, 255, 0.14);
  --site-banner-chip-bg-hover: rgba(255, 255, 255, 0.22);
  --site-banner-chip-border: rgba(255, 255, 255, 0.55);
  --site-banner-chip-border-hover: rgba(255, 255, 255, 0.85);
  --site-banner-close-fg: rgba(245, 243, 255, 0.85);
  --site-banner-close-hover-bg: rgba(255, 255, 255, 0.14);
  --site-alert-accent: #7c3aed;
  --site-alert-accent-hover: #6d28d9;
  --site-alert-accent-glow: rgba(124, 58, 237, 0.18);
  --site-alert-accent-shadow: rgba(124, 58, 237, 0.28);
}

.site-banner {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 140;
  min-height: 2.75rem;
  display: flex;
  align-items: center;
  background: var(--site-banner-bg);
  color: var(--site-banner-fg);
  border-bottom: 1px solid var(--site-banner-border);
  box-shadow: 0 1px 0 rgba(15, 23, 42, 0.12);
}

.site-banner--info:not(.site-banner--colored) {
  --site-banner-bg: linear-gradient(90deg, #1e1b4b 0%, #312e81 55%, #4338ca 100%);
}

[data-theme="dark"] .site-banner:not(.site-banner--colored) {
  --site-banner-bg: linear-gradient(90deg, #1a0a2e 0%, #4c1d95 50%, #6d28d9 100%);
  --site-banner-border: rgba(196, 181, 253, 0.18);
}

[data-theme="dark"] .site-banner--info:not(.site-banner--colored) {
  --site-banner-bg: linear-gradient(90deg, #0c0716 0%, #1e1033 50%, #2e1065 100%);
}

.site-banner__inner {
  width: 100%;
  max-width: 1440px;
  margin: 0 auto;
  padding: 0.45rem 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  box-sizing: border-box;
}

.site-banner--dismissible .site-banner__inner {
  padding-right: 0.85rem;
}

.site-banner__content {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.55rem 0.75rem;
  min-width: 0;
  flex: 1;
  text-align: center;
}

.site-banner__text {
  margin: 0;
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  line-height: 1.35;
  color: inherit;
}

.site-banner__text--link {
  text-decoration: underline;
  text-underline-offset: 0.15em;
  color: inherit;
}

.site-banner__text--link:hover {
  opacity: 0.92;
}

.site-banner__code {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.5rem;
  padding: 0.35rem 0.85rem;
  border: 1px dashed var(--site-banner-chip-border);
  border-radius: 0.55rem;
  background: var(--site-banner-chip-bg);
  color: inherit;
  font: inherit;
  font-size: 0.88rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease, transform 0.15s ease;
  -webkit-tap-highlight-color: transparent;
}

.site-banner__code:hover {
  background: var(--site-banner-chip-bg-hover);
  border-color: var(--site-banner-chip-border-hover);
}

.site-banner__code:active {
  transform: scale(0.98);
}

.site-banner__code.is-copied {
  background: var(--site-banner-chip-bg-hover);
  border-style: solid;
  border-color: var(--site-banner-chip-border-hover);
  letter-spacing: 0.02em;
  text-transform: none;
}

.site-banner__code-feedback {
  font-weight: 700;
}

.site-banner__close {
  flex-shrink: 0;
  display: grid;
  place-items: center;
  width: 2.25rem;
  height: 2.25rem;
  border: none;
  border-radius: 0.5rem;
  background: transparent;
  color: var(--site-banner-close-fg);
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
}

.site-banner__close:hover {
  background: var(--site-banner-close-hover-bg);
  color: var(--site-banner-fg);
}

html.has-site-banner .navbar.is-nav-open .navbar__right {
  padding-top: calc(5.5rem + var(--site-banner-height, 0px));
}

/* ——— Alert modal ——— */
.site-alert {
  position: fixed;
  inset: 0;
  z-index: 1100;
  display: grid;
  place-items: center;
  padding: 1.5rem;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.22s ease, visibility 0.22s ease;
}

.site-alert.is-open {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.site-alert__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 42, 0.5);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.site-alert__dialog {
  position: relative;
  z-index: 1;
  overflow: hidden;
  width: min(100%, 28rem);
  padding: 2.15rem 2rem 1.85rem;
  border-radius: 22px;
  background: #fff;
  border: 1px solid #e2e8f0;
  box-shadow: 0 28px 70px rgba(15, 23, 42, 0.3);
  text-align: center;
  transform: translateY(14px) scale(0.97);
  transition: transform 0.24s ease;
}

.site-alert.is-open .site-alert__dialog {
  transform: translateY(0) scale(1);
}

.site-alert__glow {
  position: absolute;
  top: -40%;
  left: 50%;
  width: 22rem;
  height: 14rem;
  transform: translateX(-50%);
  background: radial-gradient(ellipse at center, var(--site-alert-accent-glow), transparent 70%);
  pointer-events: none;
}

.site-alert__close {
  position: absolute;
  top: 0.85rem;
  right: 0.85rem;
  z-index: 2;
  display: grid;
  place-items: center;
  width: 2.25rem;
  height: 2.25rem;
  border: none;
  border-radius: 10px;
  background: transparent;
  color: #64748b;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
}

.site-alert__close:hover {
  background: #f1f5f9;
  color: #0f172a;
}

.site-alert__title {
  position: relative;
  z-index: 1;
  margin: 0 0 0.75rem;
  padding-right: 1.5rem;
  font-size: clamp(1.25rem, 2.2vw, 1.5rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.25;
  color: #0f172a;
}

.site-alert__message {
  position: relative;
  z-index: 1;
  margin: 0 auto 1.45rem;
  max-width: 36ch;
  font-size: 0.98rem;
  line-height: 1.65;
  color: #64748b;
}

.site-alert__btn {
  position: relative;
  z-index: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 10rem;
  padding: 0.85rem 1.35rem;
  border: none;
  border-radius: 12px;
  background: var(--site-alert-accent);
  color: #fff;
  font: inherit;
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease;
  box-shadow: 0 10px 24px var(--site-alert-accent-shadow);
}

.site-alert__btn:hover {
  background: var(--site-alert-accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 14px 28px var(--site-alert-accent-shadow);
}

[data-theme="dark"] .site-alert__backdrop {
  background: rgba(7, 4, 15, 0.62);
}

[data-theme="dark"] .site-alert__dialog {
  background: #140c24;
  border-color: #2e2048;
}

[data-theme="dark"] .site-alert__close {
  color: #a89bbf;
}

[data-theme="dark"] .site-alert__close:hover {
  background: rgba(167, 139, 250, 0.12);
  color: #f5f3ff;
}

[data-theme="dark"] .site-alert__title {
  color: #f5f3ff;
}

[data-theme="dark"] .site-alert__message {
  color: #a89bbf;
}

html.is-site-alert-locked,
html.is-site-alert-locked body {
  overflow: hidden;
  overscroll-behavior: none;
}

body.is-site-alert-locked {
  position: fixed;
  left: 0;
  right: 0;
  width: 100%;
}

@media (max-width: 640px) {
  .site-banner__inner {
    padding: 0.5rem 1rem;
    gap: 0.45rem;
  }

  .site-banner--dismissible .site-banner__inner {
    padding-right: 0.35rem;
  }

  .site-banner__text {
    font-size: 0.84rem;
  }

  .site-banner__code {
    min-height: 2.75rem;
    font-size: 0.82rem;
  }

  .site-alert__dialog {
    padding: 1.85rem 1.35rem 1.5rem;
  }
}