/* 公共组件：提供文字品牌、导航、按钮、卡片、表单与折叠问答。 */
.brand-link {
  display: inline-flex;
  min-width: 0;
  flex: 0 0 auto;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  text-decoration: none;
}

.brand-mark {
  position: relative;
  display: block;
  width: 30px;
  height: 30px;
  flex: 0 0 auto;
  border: 4px solid var(--ink);
  border-right-color: transparent;
  border-radius: 50%;
}

.brand-mark::after {
  position: absolute;
  inset: 4px;
  border: 1px solid var(--line);
  border-right-color: transparent;
  border-radius: 50%;
  content: "";
}

.footer-brand .brand-mark {
  width: 34px;
  height: 34px;
}

.brand-copy {
  display: grid;
  min-width: 0;
  line-height: 1.05;
}

.brand-copy strong {
  font-size: 0.96rem;
  font-weight: 850;
  letter-spacing: -0.025em;
}

.brand-copy small {
  margin-top: 4px;
  color: var(--ink-muted);
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.04em;
}

.site-nav-link,
.utility-link,
.workspace-nav a {
  min-width: 0;
  border: 1px solid transparent;
  color: var(--ink-soft);
  font-size: 0.84rem;
  font-weight: 700;
  line-height: 1.2;
  overflow-wrap: anywhere;
  text-decoration: none;
  transition: border-color 140ms ease, background-color 140ms ease, color 140ms ease;
}

.site-nav-link,
.utility-link {
  display: inline-flex;
  min-height: 42px;
  align-items: center;
  padding: 9px 10px;
}

.site-nav-link:hover,
.utility-link:hover,
.site-nav-link[aria-current="page"],
.utility-link[aria-current="page"] {
  border-color: var(--line);
  background: var(--paper-alt);
  color: var(--ink);
}

.site-nav-link[aria-current="page"] {
  border-bottom-color: var(--accent);
  box-shadow: inset 0 -3px 0 var(--accent);
}

.button,
.menu-button {
  min-height: 44px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line-strong);
  border-radius: 0;
  cursor: pointer;
  font-weight: 760;
  line-height: 1.1;
  overflow-wrap: anywhere;
  text-align: center;
  text-decoration: none;
  transition: border-color 140ms ease, background-color 140ms ease, color 140ms ease;
}

.button {
  display: inline-flex;
  padding: 11px 18px;
}

.button-compact {
  min-height: 38px;
  padding: 8px 13px;
  font-size: 0.82rem;
}

.button-primary {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--accent-ink);
}

.button-primary:hover {
  border-color: var(--inverse);
  background: var(--inverse);
  color: var(--inverse-ink);
}

.button-secondary,
.menu-button {
  background: var(--paper-raised);
  color: var(--ink);
}

.button-secondary:hover,
.menu-button:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
  color: var(--accent-text);
}

.button:active,
.menu-button:active {
  background: var(--paper-deep);
}

.button-full {
  width: 100%;
}

.button:disabled {
  cursor: not-allowed;
  filter: saturate(0.45);
  opacity: 0.58;
}

.menu-button {
  padding: 9px 13px;
}

.text-link {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  color: var(--accent-text);
  font-weight: 740;
  text-decoration-color: var(--accent);
  text-underline-offset: 4px;
}

.text-link:hover {
  color: var(--ink);
  text-decoration-thickness: 2px;
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: var(--space-3);
  color: var(--accent-text);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 760;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.eyebrow::before {
  width: 16px;
  height: 2px;
  flex: 0 0 auto;
  background: var(--accent);
  content: "";
}

.action-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  align-items: center;
  margin-top: var(--space-5);
}

.metric-grid {
  display: grid;
  min-width: 0;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: 1px solid var(--line-strong);
  border-left: 1px solid var(--line-strong);
}

.metric-item {
  min-width: 0;
  padding: var(--space-5);
  border-right: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
  background: var(--paper-raised);
}

.metric-item strong,
.metric-item span {
  display: block;
}

.metric-item strong {
  color: var(--accent-text);
  font-family: var(--font-mono);
  font-size: 1.22rem;
  font-variant-numeric: tabular-nums;
  font-weight: 760;
}

.metric-item span {
  margin-top: 3px;
  color: var(--ink);
  font-size: 0.9rem;
  font-weight: 740;
}

.metric-item p {
  margin: var(--space-2) 0 0;
  color: var(--ink-muted);
  font-size: 0.8rem;
}

.card-grid {
  display: grid;
  min-width: 0;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: 1px solid var(--line-strong);
  border-left: 1px solid var(--line-strong);
}

.content-card {
  min-width: 0;
  padding: var(--space-5);
  border-right: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
  background: var(--paper-raised);
}

a.content-card:hover {
  background: var(--accent-soft);
}

.content-card p {
  color: var(--ink-soft);
  font-size: 0.89rem;
}

.content-card small {
  color: var(--ink-muted);
  font-size: 0.76rem;
  font-weight: 650;
}

.card-badge {
  display: inline-block;
  max-width: 100%;
  margin-bottom: var(--space-4);
  padding: 4px 8px;
  overflow-wrap: anywhere;
  border: 1px solid var(--accent);
  background: var(--accent-soft);
  color: var(--accent-text);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 760;
}

.field-label {
  display: grid;
  min-width: 0;
  gap: var(--space-2);
  color: var(--ink-soft);
  font-size: 0.83rem;
  font-weight: 700;
}

.field-label input {
  width: 100%;
  min-height: 46px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 0;
  background: var(--paper-raised);
  color: var(--ink);
  caret-color: var(--accent-text);
  transition: border-color 140ms ease, background-color 140ms ease;
}

.field-label input::placeholder {
  color: var(--ink-muted);
  opacity: 1;
}

.field-label input:hover {
  border-color: var(--line-strong);
}

.field-label input:focus-visible {
  border-color: var(--accent);
  background: #ffffff;
}

.faq-item {
  border-top: 1px solid var(--line-strong);
}

.faq-item:last-child {
  border-bottom: 1px solid var(--line-strong);
}

.faq-item summary {
  min-height: 64px;
  padding: var(--space-5) var(--space-6) var(--space-5) 0;
  cursor: pointer;
  color: var(--ink);
  font-size: 0.98rem;
  font-weight: 740;
}

.faq-item summary::marker {
  color: var(--accent);
}

.faq-item summary:hover {
  color: var(--accent-text);
}

.faq-item p {
  max-width: var(--text-width);
  padding: 0 var(--space-6) var(--space-5) 0;
  color: var(--ink-soft);
}

@media (max-width: 1200px) {
  .site-nav-link,
  .utility-link {
    justify-content: center;
    text-align: center;
  }
}

@media (max-width: 960px) {
  .card-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .metric-grid,
  .card-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 420px) {
  .brand-copy small {
    display: none;
  }

  .action-row .button,
  .action-row .text-link {
    width: 100%;
  }
}