/* —— Sections —— */


.section {
  position: relative;
  padding: 72px 0;
}

.section + .section {
  border-top: 1px solid transparent;
  border-image: linear-gradient(
      to right,
      transparent,
      var(--line-strong),
      transparent
    )
    1;
}

.section-soft {
  background: linear-gradient(
    180deg,
    color-mix(in oklab, var(--bg-section) 55%, var(--bg)) 0%,
    var(--bg) 100%
  );
}

#settings-preview.section-soft {
  padding-top: 80px;
  padding-bottom: 64px;
  background:
    radial-gradient(ellipse 70% 45% at 50% 0%, color-mix(in oklab, var(--vh-amber) 14%, transparent), transparent 72%),
    color-mix(in oklab, var(--vh-paper-warm) 82%, var(--bg-section));
}

html[data-theme="dark"] #settings-preview.section-soft {
  background:
    radial-gradient(ellipse 70% 45% at 50% 0%, color-mix(in oklab, var(--vh-amber) 8%, transparent), transparent 72%),
    #0e0d0b;
}

.section-head {
  margin-bottom: 28px;
}

.section-head.narrow {
  width: min(var(--max), 100%);
  margin-left: auto;
  margin-right: auto;
  margin-bottom: 28px;
}

.section-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 10px;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: none;
  color: var(--vh-brand);
}

.section-kicker::before,
.section-kicker::after {
  content: "";
  width: 18px;
  height: 1px;
  background: linear-gradient(
    to right,
    transparent,
    color-mix(in oklab, var(--accent) 55%, transparent)
  );
}

.section-kicker::before {
  background: linear-gradient(
    to left,
    transparent,
    color-mix(in oklab, var(--accent) 55%, transparent)
  );
}

.section h2 {
  margin: 0 0 10px;
  font-size: 26px;
  letter-spacing: -0.01em;
  font-weight: 650;
  line-height: 1.2;
}

.section .intro {
  margin: 0;
  color: var(--vh-ink-2);
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.6;
}

.section-head + .how-list,
.section-head + .facts,
.section-head + .engines,
.section-head + .engine-block,
.section-head + .faq,
.section-head ~ .plans {
  margin-top: 8px;
}

/* —— How —— */
#how {
  padding-top: 40px;
}

.how-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.how-list li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px 18px 18px;
  border: 1px solid var(--vh-line);
  border-radius: var(--vh-r-card);
  background: var(--vh-paper);
  box-shadow: var(--vh-shadow-card);
}

.how-list .n {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--faint);
}

.how-list strong {
  font-weight: 600;
  letter-spacing: -0.01em;
}

.how-list p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.5;
}

@media (max-width: 720px) {
  .how-list {
    grid-template-columns: 1fr;
  }
}

/* —— Feature cards: 2×2, equal cell size —— */
.facts {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-auto-rows: 1fr;
  gap: 16px;
  align-items: stretch;
}

@media (max-width: 560px) {
  .facts {
    grid-template-columns: 1fr;
    grid-auto-rows: auto;
  }
}

.fact {
  display: flex;
  flex-direction: column;
  height: 100%;
  min-height: 0;
  padding: 26px 26px 24px;
  border: 1px solid var(--vh-line);
  border-radius: var(--vh-r-card);
  background: var(--vh-paper);
  box-shadow: var(--vh-shadow-card);
  transition: transform 0.15s ease, border-color 0.15s ease;
}

.fact:hover {
  border-color: var(--vh-line-strong);
  transform: translateY(-2px);
}

.fact-icon {
  width: 28px;
  height: 28px;
  border-radius: var(--vh-r-btn);
  display: grid;
  place-items: center;
  margin-bottom: 14px;
  color: var(--vh-ink-2);
  background: none;
  border: none;
}

.fact-icon svg {
  width: 24px;
  height: 24px;
}

.fact h3 {
  margin: 0 0 8px;
  font-size: 1.05rem;
  font-weight: 650;
  letter-spacing: -0.015em;
}

.fact p {
  margin: 0;
  flex: 1;
  color: var(--muted);
  font-size: 0.9rem;
}

.fact p + p {
  margin-top: 8px;
}

/* —— Engines —— */
.engines {
  display: flex;
  flex-direction: column;
  gap: 22px;
}

.engine-block {
  padding: 18px 18px 16px;
  border: 1px solid var(--vh-line);
  border-radius: var(--vh-r-card);
  background: var(--vh-paper);
  box-shadow: var(--vh-shadow-card);
}

.engine-block h3 {
  margin: 0 0 6px;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--muted);
  text-transform: none;
  letter-spacing: 0;
}

.engine-block--compact {
  padding: 20px 20px 18px;
}

.engine-footnote {
  display: flex;
  gap: 10px;
  align-items: baseline;
  margin: 14px 2px 0;
  color: var(--muted);
  font-size: 0.875rem;
  line-height: 1.5;
}

.engine-footnote-kicker {
  flex-shrink: 0;
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--vh-ink-3, var(--muted));
}

.engine-lead {
  margin: 0 0 14px;
  color: var(--ink-2);
  font-size: 0.9rem;
  line-height: 1.55;
  max-width: 40em;
}

.chip {
  display: inline-flex;
  align-items: center;
  padding: 5px 10px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--bg-soft);
  color: var(--ink-2);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  line-height: 1.3;
  white-space: nowrap;
}

.chip-muted {
  color: var(--muted);
  border-style: dashed;
}

/* —— Plans —— */
.plans {
  display: grid;
  grid-template-columns: 1fr 1.16fr 1fr;
  gap: 12px;
  align-items: stretch;
}

.plan {
  position: relative;
  padding: 24px 22px 22px;
  border: 1px solid var(--vh-line);
  border-radius: var(--vh-r-card);
  background: var(--vh-paper);
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow);
  transition: transform 0.16s ease, box-shadow 0.16s ease;
}

.plan:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.plan.highlight {
  border-color: var(--plan-highlight-border);
  background: linear-gradient(180deg, var(--plan-highlight-bg) 0%, var(--bg-elevated) 72%);
  box-shadow:
    var(--shadow-lg),
    0 0 0 1px color-mix(in oklab, var(--accent) 12%, transparent);
}

.plan-badge {
  position: absolute;
  top: 14px;
  right: 14px;
  padding: 4px 9px;
  border-radius: 999px;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: #fff;
  background: var(--accent);
}

.plan .label {
  font-size: 0.8125rem;
  font-weight: 650;
  color: var(--muted);
  margin-bottom: 4px;
}

.plan .name {
  margin: 0 0 4px;
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.plan .price {
  margin: 0 0 14px;
  font-size: 1.65rem;
  font-weight: 700;
  letter-spacing: -0.03em;
}

.plan .price span {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--muted);
}

.plan ul {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  flex: 1;
}

.plan li {
  position: relative;
  padding: 6px 0 6px 22px;
  font-size: 0.9rem;
  color: var(--ink-2);
}

.plan li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background-color: color-mix(in oklab, var(--vh-brand) 16%, transparent);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='none' stroke='%23ff6b0d' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M3.5 8.5 6.5 11.5 12.5 4.5'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: center;
  background-size: 10px 10px;
}

html[data-theme="dark"] .plan li::before {
  background-color: color-mix(in oklab, var(--vh-brand) 18%, transparent);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='none' stroke='%23ff8c14' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M3.5 8.5 6.5 11.5 12.5 4.5'/%3E%3C/svg%3E");
}

.plan li.muted {
  color: var(--faint);
}

.plan li.muted::before {
  opacity: 0.45;
}

.plan .btn {
  width: 100%;
}

.plan-note {
  margin: 16px 0 0;
  font-size: 0.8125rem;
  color: var(--muted);
}

/* —— FAQ —— */
.faq {
  border: 1px solid var(--vh-line);
  border-radius: var(--vh-r-card);
  background: var(--vh-paper);
  box-shadow: var(--vh-shadow-card);
  overflow: hidden;
}

.faq details {
  border-bottom: 1px solid var(--line);
}

.faq details:last-child {
  border-bottom: 0;
}

.faq summary {
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 18px;
  font-weight: 550;
  font-size: 0.95rem;
  list-style: none;
  letter-spacing: -0.01em;
  transition: background 0.12s ease;
}

.faq summary:hover {
  background: var(--bg-soft);
}

.faq summary::-webkit-details-marker {
  display: none;
}

.faq summary::after {
  content: "";
  flex: none;
  width: 10px;
  height: 10px;
  margin-top: -2px;
  border-right: 1.5px solid var(--faint);
  border-bottom: 1.5px solid var(--faint);
  transform: rotate(45deg);
  transition: transform 0.16s ease;
}

.faq details[open] summary::after {
  transform: rotate(225deg);
  margin-top: 4px;
}

.faq .answer {
  padding: 0 18px 16px;
  color: var(--muted);
  font-size: 0.9rem;
}

.faq .answer p {
  margin: 0 0 8px;
}

.faq .answer p:last-child {
  margin-bottom: 0;
}

/* —— Bottom CTA —— */
.bottom-cta {
  padding: 28px 0 calc(64px + env(safe-area-inset-bottom, 0px));
  text-align: center;
}

.bottom-cta-card {
  position: relative;
  overflow: hidden;
  padding: 44px 32px 36px;
  border: 1px solid var(--vh-line);
  border-radius: var(--vh-r-card);
  background:
    radial-gradient(ellipse 80% 80% at 50% -20%, var(--glow), transparent 60%),
    linear-gradient(180deg, var(--plan-highlight-bg) 0%, var(--vh-paper) 70%);
  box-shadow: var(--vh-shadow-hero);
}

.bottom-cta-card::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, color-mix(in oklab, var(--ink) 4%, transparent) 1px, transparent 1px),
    linear-gradient(to bottom, color-mix(in oklab, var(--ink) 4%, transparent) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: radial-gradient(ellipse 70% 70% at 50% 0%, #000 10%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 70% 70% at 50% 0%, #000 10%, transparent 75%);
  opacity: 0.5;
}

.bottom-cta-card > * {
  position: relative;
  z-index: 1;
}

.bottom-cta h2 {
  margin: 0 0 8px;
  font-size: 1.35rem;
  letter-spacing: -0.02em;
}

.bottom-cta p {
  margin: 0 auto 20px;
  color: var(--muted);
  max-width: 28em;
  font-size: 0.95rem;
}

.bottom-cta .hero-actions {
  margin-bottom: 0;
}

/* —— Footer —— */
.site-footer {
  border-top: 1px solid var(--vh-line);
  padding: 28px 0 calc(40px + env(safe-area-inset-bottom, 0px));
  color: var(--vh-ink-3);
  font-size: 13px;
}

.footer-cols {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 24px;
  align-items: start;
}
@media (max-width: 720px) {
  .footer-cols {
    grid-template-columns: 1fr 1fr;
    gap: 20px;
  }
  .footer-brand {
    grid-column: 1 / -1;
  }
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.footer-brand img {
  width: 18px;
  height: 18px;
  opacity: 0.85;
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-col h4 {
  margin: 0 0 4px;
  font-size: 13px;
  font-weight: 650;
  color: var(--vh-ink-2);
}

.footer-col a {
  color: var(--vh-ink-3);
  text-decoration: none;
  font-size: 13px;
}

.footer-col a:hover {
  color: var(--vh-ink);
}
.vh-providers {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
}
.vh-providers img {
  width: 22px;
  height: 22px;
  object-fit: contain;
  filter: grayscale(1);
  opacity: 0.6;
  transition: filter 0.15s ease, opacity 0.15s ease;
}
.vh-providers img:hover,
.vh-providers img:focus-visible {
  filter: none;
  opacity: 1;
}
.vh-providers .chip {
  align-self: center;
}

/* —— Section entrance (唯一入场动效) —— */
.vh-reveal {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.2s ease-out, transform 0.2s ease-out;
}
.vh-reveal.is-in {
  opacity: 1;
  transform: none;
}
@media (prefers-reduced-motion: reduce) {
  .vh-reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}