@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:ital,wght@0,400;0,500;0,700;1,400&display=swap');

:root {
  --plum: #56228b;
  --plum-soft: #7b45a8;
  --clay: #8b4513;
  --clay-soft: #b8733f;
  --ink: #1f1726;
  --cream: #faf5ef;
  --card: #fffdfa;
  --line: rgba(139, 69, 19, 0.16);
  --muted: #5d5064;
  --shadow-soft: 0 22px 46px -34px rgba(31, 23, 38, 0.55);
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background-color: var(--cream);
  background-image:
    radial-gradient(circle at 10% 6%, rgba(86, 34, 139, 0.09), transparent 40%),
    radial-gradient(circle at 92% 3%, rgba(139, 69, 19, 0.11), transparent 36%),
    radial-gradient(circle at 78% 88%, rgba(86, 34, 139, 0.06), transparent 44%);
  background-attachment: fixed;
  color: var(--ink);
  font-family: 'Plus Jakarta Sans', system-ui, -apple-system, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  font-size: 17px;
  line-height: 1.72;
  overflow-x: hidden;
}

img,
svg {
  max-width: 100%;
}

a {
  color: var(--plum);
  text-decoration: none;
}

a:hover {
  color: var(--clay);
}

:focus-visible {
  outline: 3px solid var(--clay-soft);
  outline-offset: 3px;
  border-radius: 6px;
}

/* 页头 */
.masthead {
  position: sticky;
  top: 0;
  z-index: 30;
  background: rgba(250, 245, 239, 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  gap: 6px;
  max-width: 1180px;
  margin: 0 auto;
  padding: 8px 22px;
}

.wing {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 2px;
  margin: 0;
  min-width: 0;
}

.wing-r {
  justify-content: flex-end;
}

.wing a {
  display: inline-block;
  padding: 12px 9px;
  font-size: 16px;
  font-weight: 500;
  color: var(--ink);
  line-height: 1.4;
  border-radius: 999px;
  transition: background-color 0.25s ease, color 0.25s ease;
}

.wing a:hover,
.wing a.on {
  background: rgba(86, 34, 139, 0.11);
  color: var(--plum);
}

.brandbar {
  margin: 0;
  text-align: center;
}

.brandbar .brand {
  display: inline-block;
  padding: 10px 18px;
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--plum);
  border: 1px solid rgba(86, 34, 139, 0.24);
  border-radius: 40px 22px 40px 22px;
  background: rgba(86, 34, 139, 0.06);
  white-space: nowrap;
}

/* 首屏 */
.hero {
  display: flex;
  align-items: center;
  gap: 30px;
  max-width: 1180px;
  margin: 0 auto;
  padding: 40px 22px 30px;
  min-height: 42vh;
}

.hero-copy {
  flex: 1 1 auto;
  min-width: 0;
}

.badge {
  display: inline-block;
  margin: 0 0 16px;
  padding: 7px 16px;
  border-radius: 999px;
  border: 1px solid rgba(86, 34, 139, 0.22);
  background: rgba(86, 34, 139, 0.08);
  color: var(--plum);
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.05em;
  transform: rotate(-1.6deg);
}

.hero-title {
  margin: 0;
  font-size: clamp(2.05rem, 6.4vw, 4.05rem);
  line-height: 1.06;
  letter-spacing: -0.032em;
  font-weight: 700;
  color: var(--ink);
}

.lede {
  max-width: 48ch;
  margin: 18px 0 0;
  font-size: 18px;
  line-height: 1.75;
  color: var(--muted);
}

.hero-art {
  flex: 0 0 258px;
  margin: 0;
  animation: drift 11s ease-in-out infinite;
}

.hero-art .blob {
  width: 100%;
  height: auto;
  filter: drop-shadow(0 26px 34px rgba(86, 34, 139, 0.24));
}

@keyframes drift {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-13px) rotate(-2deg); }
}

/* 主体两栏 */
.stage {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 286px;
  gap: 30px;
  align-items: start;
  max-width: 1180px;
  margin: 0 auto;
  padding: 8px 22px 72px;
}

.content-col {
  display: flex;
  flex-direction: column;
  gap: 24px;
  min-width: 0;
}

.content-col > div {
  position: relative;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 28px 26px 30px;
  box-shadow: var(--shadow-soft);
  scroll-margin-top: 104px;
  transition: transform 0.38s ease, box-shadow 0.38s ease, border-color 0.38s ease;
}

.content-col > div::before {
  content: "";
  position: absolute;
  left: -1px;
  top: 26px;
  width: 5px;
  height: 34px;
  border-radius: 0 4px 4px 0;
  background: linear-gradient(180deg, var(--plum), var(--clay));
  opacity: 0.55;
}

.content-col > div:hover {
  transform: translateY(-4px);
  box-shadow: 0 30px 58px -34px rgba(31, 23, 38, 0.6);
  border-color: rgba(86, 34, 139, 0.28);
}

/* 正文排版 */
.content-col h2 {
  margin: 26px 0 12px;
  font-size: clamp(1.35rem, 2.7vw, 1.78rem);
  line-height: 1.28;
  letter-spacing: -0.018em;
  color: var(--plum);
}

.content-col h3 {
  margin: 22px 0 10px;
  font-size: 1.16rem;
  line-height: 1.35;
  color: var(--clay);
}

.content-col h2:first-child,
.content-col h3:first-child {
  margin-top: 0;
}

.content-col p {
  margin: 0 0 15px;
  line-height: 1.82;
}

.content-col ul,
.content-col ol {
  margin: 0 0 16px;
  padding-left: 22px;
}

.content-col li {
  margin-bottom: 8px;
  line-height: 1.75;
}

.content-col blockquote {
  margin: 18px 0;
  padding: 16px 20px;
  border-radius: 18px 6px 18px 6px;
  background: rgba(139, 69, 19, 0.07);
  border-left: 4px solid var(--clay-soft);
  color: #4a3f52;
}

.content-col blockquote p:last-child {
  margin-bottom: 0;
}

.content-col img {
  height: auto;
  border-radius: 4px;
  box-shadow: var(--shadow-soft);
}

.content-col figure {
  margin: 18px 0;
}

.content-col table {
  display: block;
  width: 100%;
  overflow-x: auto;
  border-collapse: collapse;
  margin: 18px 0;
  font-size: 16px;
}

.content-col th,
.content-col td {
  border: 1px solid var(--line);
  padding: 9px 12px;
  text-align: left;
}

.content-col th {
  background: rgba(86, 34, 139, 0.07);
  color: var(--plum);
}

.content-col code {
  background: rgba(31, 23, 38, 0.07);
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 0.94em;
}

/* 侧栏 */
.rail {
  position: sticky;
  top: 96px;
  padding: 22px 18px 24px;
  background: #f3ece2;
  border: 1px solid var(--line);
  border-radius: 30px 14px 30px 14px;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.7);
}

.rail-h {
  display: flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 10px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--clay);
}

.rail-h-2 {
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px dashed rgba(139, 69, 19, 0.3);
}

.rail-h .dot {
  flex: 0 0 auto;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--clay);
}

.rail-h-2 .dot {
  background: var(--plum);
}

.rail-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.rail-list a {
  display: block;
  padding: 10px 12px;
  min-height: 42px;
  font-size: 16px;
  color: #3c3243;
  border-radius: 14px;
  transition: background-color 0.25s ease, color 0.25s ease, padding-left 0.25s ease;
}

.rail-list a:hover,
.rail-list a.on {
  background: rgba(86, 34, 139, 0.12);
  color: var(--plum);
  padding-left: 16px;
}

.rail-note {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: #55485c;
}

/* 页脚 */
.site-foot {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  column-gap: 32px;
  row-gap: 22px;
  background: var(--ink);
  color: #efe6f3;
  padding: 52px max(22px, calc((100% - 1140px) / 2)) 26px;
}

.site-foot a {
  color: #e2d4ec;
}

.site-foot a:hover {
  color: #fff;
}

.foot-cta {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 22px;
  margin: 0;
  padding-bottom: 26px;
  border-bottom: 1px solid rgba(239, 230, 243, 0.18);
}

.cta-word {
  font-size: clamp(1.55rem, 4vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: #fff;
}

.cta-link {
  display: inline-block;
  padding: 12px 22px;
  min-height: 44px;
  border: 1px solid rgba(239, 230, 243, 0.42);
  border-radius: 999px;
  font-size: 16px;
  font-weight: 500;
  transition: background-color 0.25s ease, border-color 0.25s ease;
}

.cta-link:hover {
  background: rgba(239, 230, 243, 0.14);
  border-color: #fff;
}

.foot-desc {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(239, 230, 243, 0.72);
}

.foot-links {
  display: flex;
  flex-wrap: wrap;
  align-content: flex-start;
  gap: 2px 4px;
  margin: 0;
}

.foot-links a {
  display: inline-block;
  padding: 11px 11px;
  min-height: 42px;
  font-size: 16px;
  border-radius: 12px;
  transition: background-color 0.25s ease;
}

.foot-links a:hover {
  background: rgba(239, 230, 243, 0.13);
}

.foot-copy {
  grid-column: 1 / -1;
  padding-top: 18px;
  border-top: 1px solid rgba(239, 230, 243, 0.14);
  font-size: 14px;
  color: rgba(239, 230, 243, 0.58);
}

/* 滚动渐显 */
.rv {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.6s ease, transform 0.6s cubic-bezier(0.2, 0.7, 0.3, 1);
}

.rv.rv-in {
  opacity: 1;
  transform: none;
}

@media (max-width: 980px) {
  .stage {
    grid-template-columns: minmax(0, 1fr);
    padding-bottom: 56px;
  }

  .rail {
    position: static;
    border-radius: 22px;
  }

  .rail-list {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 4px;
  }

  .rail-list a {
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.6);
  }

  .rail-list a:hover,
  .rail-list a.on {
    padding-left: 12px;
  }
}

@media (max-width: 760px) {
  .masthead {
    position: static;
  }

  .split {
    grid-template-columns: minmax(0, 1fr);
    padding: 10px 14px 12px;
    gap: 4px;
  }

  .brandbar {
    order: -1;
    text-align: left;
  }

  .brandbar .brand {
    padding: 9px 16px;
    font-size: 18px;
  }

  .wing,
  .wing-r {
    justify-content: flex-start;
  }

  .wing a {
    padding: 11px 9px;
    font-size: 16px;
    background: rgba(255, 255, 255, 0.62);
    border-radius: 14px;
  }

  .hero {
    display: block;
    min-height: 0;
    padding: 26px 14px 22px;
  }

  .hero-art {
    display: none;
  }

  .lede {
    font-size: 17px;
    margin-top: 14px;
  }

  .stage {
    padding: 6px 14px 48px;
  }

  .content-col {
    gap: 18px;
  }

  .content-col > div {
    padding: 22px 18px 24px;
    scroll-margin-top: 16px;
  }

  .site-foot {
    grid-template-columns: minmax(0, 1fr);
    padding: 40px 16px 22px;
    row-gap: 18px;
  }

  .foot-links {
    repeat: wrap;
  }
}

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

  .hero-art {
    animation: none;
  }

  .content-col > div,
  .rv {
    transition: none;
  }

  .rv {
    opacity: 1;
    transform: none;
  }
}

button[aria-expanded]{min-width:44px;min-height:44px}