:root {
  --paper: #f6f1ea;
  --ink: #2f2a4a;
  --ink-soft: #5a5278;
  --wash-blue: #7eb6e6;
  --wash-violet: #b39ad6;
  --wash-lilac: #c9b8e8;
  --wash-sky: #9ec8ef;
  --rose: #d8b4d4;
  --card: rgba(255, 252, 248, 0.62);
  --card-strong: rgba(255, 252, 248, 0.82);
  --line: rgba(90, 82, 120, 0.16);
  --cta: #5a4f9a;
  --cta-ink: #fffaf4;
  --focus: #4d46a8;
  --shadow: 0 18px 40px rgba(72, 62, 120, 0.1);
  --radius: 1.5rem;
  --wrap: 72rem;
  --header-h: 4.5rem;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.7;
  background:
    radial-gradient(ellipse 70% 55% at 8% 12%, rgba(126, 182, 230, 0.55) 0%, transparent 58%),
    radial-gradient(ellipse 60% 50% at 92% 8%, rgba(179, 154, 214, 0.5) 0%, transparent 55%),
    radial-gradient(ellipse 55% 60% at 78% 88%, rgba(158, 200, 239, 0.42) 0%, transparent 60%),
    radial-gradient(ellipse 50% 45% at 14% 86%, rgba(216, 180, 212, 0.38) 0%, transparent 52%),
    radial-gradient(ellipse 40% 35% at 48% 42%, rgba(201, 184, 232, 0.28) 0%, transparent 62%),
    linear-gradient(180deg, #f8f3ec 0%, #efe8f6 46%, #e8eef8 100%);
  background-attachment: fixed;
}

body::before,
body::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
}

body::before {
  background:
    radial-gradient(closest-side at 22% 28%, rgba(255, 255, 255, 0.42), transparent 72%),
    radial-gradient(closest-side at 70% 22%, rgba(255, 255, 255, 0.28), transparent 70%),
    radial-gradient(closest-side at 60% 70%, rgba(255, 255, 255, 0.2), transparent 74%);
  animation: wash-drift 18s ease-in-out infinite;
}

body::after {
  opacity: 0.22;
  mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.8' numOctaves='4' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 .38 0 0 0 0 .34 0 0 0 0 .42 0 0 0 .55 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

@keyframes wash-drift {
  0%,
  100% { transform: translate3d(0, 0, 0) scale(1); }
  50% { transform: translate3d(1.4%, -1.2%, 0) scale(1.04); }
}

img {
  max-width: 100%;
  height: auto;
}

a {
  color: var(--cta);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

a:hover {
  color: #433c86;
}

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
}

.skip {
  position: absolute;
  left: 0.8rem;
  top: -3rem;
  z-index: 80;
  padding: 0.55rem 0.9rem;
  background: var(--card-strong);
  border-radius: 999px;
}

.skip:focus {
  top: 0.8rem;
}

.wrap {
  width: min(calc(100% - 2rem), var(--wrap));
  margin-inline: auto;
}

.topbar {
  padding: 0.45rem 0;
  font-size: 0.82rem;
  color: var(--ink-soft);
  background: rgba(255, 250, 245, 0.38);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(10px);
}

.topbar-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.4rem 1rem;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(246, 241, 234, 0.72);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(16px);
}

.site-header.is-scrolled {
  box-shadow: 0 10px 28px rgba(72, 62, 120, 0.08);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-h);
  gap: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  color: inherit;
  text-decoration: none;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.brand img {
  width: 2.5rem;
  height: 2.5rem;
  object-fit: cover;
  border-radius: 50%;
  box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.7), 0 8px 16px rgba(90, 79, 154, 0.16);
}

.brand small {
  display: block;
  font-weight: 500;
  font-size: 0.72rem;
  color: var(--ink-soft);
}

.nav-toggle {
  display: none;
  width: 2.6rem;
  height: 2.6rem;
  border: 1px solid var(--line);
  border-radius: 0.9rem;
  background: var(--card);
  color: var(--ink);
  cursor: pointer;
}

.nav-panel ul {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.25rem 0.15rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-panel a {
  display: inline-flex;
  align-items: center;
  min-height: 2.4rem;
  padding: 0.25rem 0.8rem;
  border-radius: 999px;
  color: var(--ink);
  text-decoration: none;
}

.nav-panel a:hover,
.nav-panel a[aria-current="page"] {
  background: rgba(255, 255, 255, 0.62);
}

.nav-panel a.cta {
  background: var(--cta);
  color: var(--cta-ink);
  box-shadow: var(--shadow);
}

.nav-panel a.cta:hover {
  color: var(--cta-ink);
  filter: brightness(1.06);
}

.hero,
.page-hero,
section {
  padding: 3.4rem 0;
}

.hero {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 2.4rem;
  align-items: center;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.75rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.55);
  border: 1px solid rgba(255, 255, 255, 0.8);
  color: var(--ink-soft);
  font-size: 0.8rem;
}

h1,
h2,
h3 {
  margin: 0 0 0.7rem;
  line-height: 1.25;
  font-family: Georgia, "Palatino Linotype", "Songti SC", "STSong", serif;
  font-weight: 650;
}

h1 {
  font-size: clamp(2.1rem, 4vw, 3.4rem);
}

h2 {
  font-size: clamp(1.5rem, 2.6vw, 2rem);
}

h3 {
  font-size: 1.12rem;
}

.lead,
.hero p,
.page-hero p {
  color: var(--ink-soft);
  font-size: 1.05rem;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 1.4rem 0 1.6rem;
}

.button,
.button-alt {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.9rem;
  padding: 0.45rem 1.2rem;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 650;
}

.button {
  background: var(--cta);
  color: var(--cta-ink);
  box-shadow: var(--shadow);
}

.button:hover {
  color: var(--cta-ink);
}

.button-alt {
  background: rgba(255, 255, 255, 0.58);
  color: var(--ink);
  border: 1px solid rgba(255, 255, 255, 0.85);
}

.metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.75rem;
}

.metric,
.card,
.seo-card,
.platform,
.faq details,
.note,
.warn,
.step {
  background: var(--card);
  border: 1px solid rgba(255, 255, 255, 0.78);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
}

.metric {
  padding: 0.9rem 1rem;
}

.metric b,
.metric strong {
  display: block;
  font-size: 1.15rem;
}

.metric span {
  color: var(--ink-soft);
  font-size: 0.86rem;
}

.hero-art {
  position: relative;
}

.hero-art img,
.detail img,
.figure img {
  display: block;
  width: 100%;
  border-radius: 1.8rem;
  box-shadow: var(--shadow);
  background: rgba(255, 255, 255, 0.4);
}

.wash-label {
  position: absolute;
  left: 1rem;
  bottom: 1rem;
  padding: 0.35rem 0.8rem;
  border-radius: 999px;
  background: rgba(255, 252, 248, 0.82);
  font-size: 0.8rem;
}

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 1rem;
  margin-bottom: 1.4rem;
}

.section-head p {
  max-width: 36rem;
  margin: 0;
  color: var(--ink-soft);
}

.grid-4,
.grid-3,
.grid-2 {
  display: grid;
  gap: 1rem;
}

.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }

.card,
.seo-card,
.platform,
.step {
  padding: 1.2rem 1.25rem;
}

.seo-card,
.platform,
.card {
  color: inherit;
  text-decoration: none;
}

.seo-card:hover,
.platform:hover,
a.card:hover {
  transform: translateY(-3px);
  background: var(--card-strong);
}

.kicker {
  display: block;
  margin-bottom: 0.4rem;
  color: #6b5ea8;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.detail {
  display: grid;
  grid-template-columns: 0.95fr 1.05fr;
  gap: 2rem;
  align-items: center;
}

.checklist {
  margin: 0;
  padding: 0;
  list-style: none;
}

.checklist li {
  position: relative;
  padding: 0.45rem 0 0.45rem 1.5rem;
}

.checklist li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.8rem;
  width: 0.7rem;
  height: 0.7rem;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, #fff, var(--wash-violet));
}

.faq details {
  padding: 0.2rem 1.1rem 0.85rem;
  margin-bottom: 0.75rem;
}

.faq summary {
  cursor: pointer;
  list-style: none;
  padding: 0.85rem 0;
  font-weight: 650;
}

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

.faq summary::after {
  content: "展开";
  float: right;
  font-weight: 500;
  color: var(--ink-soft);
  font-size: 0.82rem;
}

.faq details[open] summary::after {
  content: "收起";
}

.note,
.warn {
  padding: 0.95rem 1.1rem;
  margin-top: 1rem;
}

.warn {
  background: rgba(255, 244, 232, 0.72);
}

.page-hero {
  padding-bottom: 1.2rem;
}

.crumbs {
  margin: 0 0 0.8rem;
  color: var(--ink-soft);
}

footer {
  padding: 2.6rem 0 1.6rem;
  border-top: 1px solid var(--line);
  background: rgba(255, 250, 245, 0.36);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 1.4rem;
}

.footer-grid h3 {
  font-size: 1rem;
}

.footer-grid ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-grid li {
  margin: 0.35rem 0;
}

.footer-grid p,
.legal {
  color: var(--ink-soft);
}

.legal {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5rem;
  margin-top: 1.6rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  font-size: 0.88rem;
}

.logo-block img {
  width: 2.4rem;
  height: 2.4rem;
}

@media (max-width: 960px) {
  .hero,
  .detail,
  .footer-grid,
  .grid-4,
  .grid-3 {
    grid-template-columns: 1fr 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 760px) {
  .nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .nav-panel {
    position: absolute;
    left: 1rem;
    right: 1rem;
    top: calc(var(--header-h) + 0.4rem);
    display: none;
    padding: 0.7rem;
    background: var(--card-strong);
    border: 1px solid rgba(255, 255, 255, 0.85);
    border-radius: 1.2rem;
    box-shadow: var(--shadow);
  }

  .nav-panel.is-open {
    display: block;
  }

  .nav-panel ul {
    flex-direction: column;
    align-items: stretch;
  }

  .hero,
  .detail,
  .footer-grid,
  .grid-4,
  .grid-3,
  .grid-2,
  .metrics {
    grid-template-columns: 1fr;
  }

  .section-head {
    flex-direction: column;
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  body::before,
  .seo-card,
  .platform,
  a.card {
    animation: none;
    transition: none;
  }

  .seo-card:hover,
  .platform:hover,
  a.card:hover {
    transform: none;
  }
}