/* Top / Bottom / buttons / forms — shared site chrome */

.site-top {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  height: var(--site-top-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--page-pad);
  background: rgba(10, 10, 10, 0.72);
  border-bottom: 1px solid transparent;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition:
    height var(--dur) var(--ease),
    background var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}

.site-top.is-compact {
  height: var(--site-top-h-compact);
  background: rgba(10, 10, 10, 0.88);
  border-bottom-color: var(--line-subtle);
}

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  min-height: 44px;
}

.site-brand img {
  width: 28px;
  height: 28px;
  border-radius: 6px;
}

.site-brand__name {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.01em;
}

.site-brand__name span {
  color: var(--text-muted);
  font-weight: 500;
  margin-left: 6px;
}

.site-nav {
  display: flex;
  align-items: center;
  flex-wrap: nowrap;
  gap: 8px;
  min-width: 0;
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.site-nav::-webkit-scrollbar {
  display: none;
}

.site-nav__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 44px;
  padding: 0 12px;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--text-body);
  white-space: nowrap;
  flex-shrink: 0;
  transition: color var(--dur-fast) var(--ease);
}

.site-nav__link:hover,
.site-nav__link[aria-current="page"] {
  color: var(--accent-hover);
}

/*
 * Nav presentation contract:
 * - PC / tablet (>720px): full TEXT labels — never show icons / short labels
 * - Phone (≤720px): short TEXT only（演示/文档/联系）— never show icons
 */
.site-nav__icon,
.site-nav__glyph {
  display: none !important;
}

.site-nav__label {
  display: inline !important;
}

.site-nav__short {
  display: none !important;
}

/* Language switch — same family as nav links, no capsule */
.site-lang {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  margin-left: 4px;
  margin-right: 2px;
  flex-shrink: 0;
  padding: 0;
  border: none;
  background: transparent;
}

.site-lang__link {
  position: relative;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  min-height: 44px;
  padding: 0 8px;
  display: inline-flex;
  align-items: center;
  transition: color 220ms var(--ease);
}

.site-lang__link:hover {
  color: var(--accent-hover);
}

.site-lang__link.is-active,
.site-lang__link[aria-current="true"] {
  color: var(--accent-hover);
  pointer-events: none;
}

.site-lang__link.is-active::after,
.site-lang__link[aria-current="true"]::after {
  content: '';
  position: absolute;
  left: 8px;
  right: 8px;
  bottom: 10px;
  height: 1px;
  background: currentColor;
  opacity: 0.55;
  border-radius: 1px;
}

.site-lang__sep {
  width: 1px;
  height: 10px;
  margin: 0 1px;
  background: rgba(255, 255, 255, 0.14);
  border-radius: 1px;
  font-size: 0;
  color: transparent;
  user-select: none;
}

.site-lang__link:focus-visible,
.site-nav__link:focus-visible {
  outline: 1px solid var(--accent);
  outline-offset: 2px;
}

html.lang-leaving body {
  cursor: progress;
}

@media (prefers-reduced-motion: reduce) {
  .site-lang__link {
    transition: none;
  }
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 10px 18px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition:
    background var(--dur-fast) var(--ease),
    border-color var(--dur-fast) var(--ease),
    color var(--dur-fast) var(--ease),
    opacity var(--dur-fast) var(--ease),
    transform var(--dur-fast) var(--ease);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn--primary {
  background: #ececec;
  color: #0a0a0a;
}

.btn--primary:hover:not(:disabled) {
  background: #ffffff;
}

.btn--ghost {
  background: transparent;
  border-color: var(--line);
  color: var(--text);
}

.btn--ghost:hover:not(:disabled) {
  border-color: rgba(255, 255, 255, 0.22);
  background: rgba(255, 255, 255, 0.03);
}

.btn--sm {
  min-height: 40px;
  padding: 8px 14px;
  font-size: 13px;
}

.site-main {
  padding-top: var(--site-top-h);
}

.site-bottom {
  border-top: 1px solid var(--line-subtle);
  background: var(--bg-elevated);
  padding: 40px var(--page-pad) 32px;
}

.site-bottom__inner {
  max-width: var(--content-max);
  margin: 0 auto;
  display: grid;
  gap: 16px;
}

.site-bottom__trust {
  margin: 0;
  font-size: 14px;
  color: var(--text-body);
}

.site-bottom__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 20px;
  font-size: 13px;
  color: var(--text-muted);
}

.site-bottom__meta a:hover {
  color: var(--accent-hover);
}

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

.field label {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
}

.field input,
.field textarea {
  width: 100%;
  background: var(--bg-elevated);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 12px 14px;
  color: var(--text);
  transition: border-color var(--dur-fast) var(--ease), box-shadow var(--dur-fast) var(--ease);
}

.field input:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.field textarea {
  min-height: 120px;
  resize: vertical;
}

.field__error {
  font-size: 12px;
  color: var(--danger);
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(16, 163, 127, 0.35);
  background: var(--accent-soft);
  color: var(--accent-hover);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

@media (max-width: 720px) {
  :root {
    /* Keep in sync with responsive.css — single chrome height site-wide */
    --page-pad: 16px;
    --site-top-h: 56px;
    --site-top-h-compact: 52px;
  }

  .site-top {
    flex-wrap: nowrap;
    gap: 8px;
    padding: 0 12px;
  }

  .site-brand {
    min-width: 0;
    flex-shrink: 0;
    gap: 0;
    min-height: 40px;
  }

  .site-brand img {
    width: 26px;
    height: 26px;
  }

  .site-brand__name {
    display: none;
  }

  .site-nav {
    gap: 0;
    margin-left: auto;
    overflow: visible;
    flex: 0 0 auto;
  }

  /* Phone menu: short text 演示 / 文档 / 联系 (+ login) — home·compare·faq → footer */
  .site-nav__link:not([data-nav-mobile="1"]) {
    display: none !important;
  }

  .site-nav__link[data-nav-mobile="1"] {
    width: auto;
    min-width: 0;
    min-height: 40px;
    padding: 0 8px;
    justify-content: center;
    gap: 0;
    font-size: 13px;
  }

  /* Phone: never icons — short text only */
  .site-nav__link[data-nav-mobile="1"] .site-nav__icon,
  .site-nav__link[data-nav-mobile="1"] .site-nav__glyph,
  .site-nav__login .site-nav__icon,
  .site-nav__login .site-nav__glyph {
    display: none !important;
  }

  .site-nav__link[data-nav-mobile="1"] .site-nav__label {
    display: none !important;
  }

  .site-nav__link[data-nav-mobile="1"] .site-nav__short {
    display: inline !important;
  }

  .site-lang {
    margin: 0 2px 0 4px;
    gap: 0;
  }

  .site-lang__sep,
  .site-lang__link.is-active,
  .site-lang__link[aria-current="true"] {
    display: none;
  }

  .site-lang__link:not(.is-active):not([aria-current="true"]) {
    min-height: 40px;
    padding: 0 6px;
    font-size: 12px;
    letter-spacing: 0.04em;
  }

  .site-nav__login {
    width: auto;
    min-width: 0;
    min-height: 36px;
    max-height: 36px;
    padding: 0 12px;
    border-radius: var(--radius-pill);
    gap: 0;
    justify-content: center;
    font-size: 13px;
  }

  .site-nav__login .site-nav__label {
    display: inline !important;
  }

  .site-bottom__meta {
    flex-wrap: wrap;
    gap: 10px 14px;
  }
}

/* Explicit PC/tablet guard: full labels, no icons / short labels */
@media (min-width: 721px) {
  .site-nav__icon,
  .site-nav__glyph,
  .site-nav__login .site-nav__icon,
  .site-nav__login .site-nav__glyph,
  .site-nav__short {
    display: none !important;
  }

  .site-nav__label,
  .site-nav__login .site-nav__label {
    display: inline !important;
  }

  .site-nav__link:not([data-nav-mobile="1"]) {
    display: inline-flex !important;
  }
}

/*
 * Locked left nav (Showcase / Docs / FAQ)
 * html/body overflow-x:clip breaks position:sticky — use slot + fixed (site.js).
 */
.pin-nav-slot {
  position: relative;
  align-self: start;
  min-width: 0;
  box-sizing: border-box;
}

.pin-nav-slot > [data-pin-nav] {
  top: calc(var(--site-top-h, 64px) + 16px);
  max-height: calc(100dvh - var(--site-top-h, 64px) - 32px);
  overflow: hidden;
  overscroll-behavior: none;
  box-sizing: border-box;
  z-index: 40;
}

@media (max-width: 900px) {
  .pin-nav-slot > [data-pin-nav] {
    position: static !important;
    left: auto !important;
    width: auto !important;
    top: auto !important;
    max-height: none;
    overflow: visible;
    z-index: auto;
  }
}