@import url('https://fonts.googleapis.com/css2?family=Be+Vietnam+Pro:wght@300;400;500;600;700&family=Noto+Sans:wght@300;400;500;600;700&display=swap');

:root {
  --purple: #56228b;
  --purple-deep: #3d1566;
  --purple-soft: #efe6f8;
  --brown: #8b4513;
  --brown-soft: #f3e7db;
  --ink: #1f1726;
  --ink-soft: #4c4056;
  --paper: #f8f4ee;
  --surface: #fffdfa;
  --line: rgba(31, 23, 38, 0.12);
  --shadow-soft: 0 18px 42px -26px rgba(31, 23, 38, 0.5);
  --r-xl: 34px;
  --r-lg: 24px;
  --r-md: 18px;
}

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

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

body {
  margin: 0;
  font-family: "Be Vietnam Pro", "Noto Sans", -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 17px;
  line-height: 1.75;
  color: var(--ink);
  background-color: var(--paper);
  background-image:
    radial-gradient(circle at 10% 6%, rgba(86, 34, 139, 0.1), transparent 44%),
    radial-gradient(circle at 90% 20%, rgba(139, 69, 19, 0.1), transparent 42%),
    radial-gradient(circle at 60% 98%, rgba(86, 34, 139, 0.07), transparent 50%);
  background-attachment: fixed;
}

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

a {
  color: var(--purple);
  text-decoration: none;
  transition: color 0.22s ease, background-color 0.22s ease;
}

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

p {
  margin: 0 0 1em;
}

:focus-visible {
  outline: 3px solid var(--purple);
  outline-offset: 3px;
  border-radius: 10px;
}

/* 顶部 */
.site-head {
  position: relative;
  z-index: 30;
  padding: 10px clamp(12px, 4vw, 40px) 14px;
  background: rgba(248, 244, 238, 0.93);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(10px);
}

.ticker {
  margin: 0 0 10px;
  text-align: center;
  font-size: 16px;
  letter-spacing: 0.22em;
  color: var(--brown);
}

.nav {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 14px;
  max-width: 1180px;
  margin: 0 auto;
}

.nav-side {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 2px;
  margin: 0;
}

.nav-side.is-right {
  justify-content: flex-end;
}

.nav-side a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 8px 11px;
  font-size: 16px;
  color: var(--ink-soft);
  border-radius: 14px;
}

.nav-side a:hover {
  background: var(--purple-soft);
  color: var(--purple-deep);
}

.brand {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 8px 20px;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--purple-deep);
  white-space: nowrap;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 999px;
  box-shadow: var(--shadow-soft);
}

.nav-group {
  position: relative;
  display: inline-flex;
  align-items: center;
}

.nav-group > a {
  padding-right: 24px;
}

.nav-group::after {
  content: "";
  position: absolute;
  right: 10px;
  top: 50%;
  width: 6px;
  height: 6px;
  border-right: 2px solid var(--brown);
  border-bottom: 2px solid var(--brown);
  transform: translateY(-70%) rotate(45deg);
  pointer-events: none;
}

.submenu {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  display: none;
  flex-direction: column;
  gap: 2px;
  min-width: 168px;
  padding: 8px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  box-shadow: var(--shadow-soft);
}

.nav-group:hover .submenu,
.nav-group:focus-within .submenu {
  display: flex;
}

/* 头部下方主视觉 */
.hero {
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 22px;
  min-height: 70vh;
  padding: 46px clamp(16px, 5vw, 40px) 44px;
  text-align: center;
  background: linear-gradient(180deg, rgba(239, 230, 248, 0.8), rgba(248, 244, 238, 0) 72%);
}

.blob {
  position: absolute;
  z-index: 0;
  fill: rgba(86, 34, 139, 0.1);
}

.blob-a {
  top: -70px;
  left: -80px;
}

.blob-b {
  right: -90px;
  bottom: -70px;
  fill: rgba(139, 69, 19, 0.1);
}

.hero-copy {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
}

.badge {
  display: inline-flex;
  align-items: center;
  min-height: 42px;
  padding: 6px 20px;
  font-size: 16px;
  letter-spacing: 0.14em;
  color: var(--purple-deep);
  background: var(--surface);
  border: 1px solid rgba(86, 34, 139, 0.26);
  border-radius: 999px;
  box-shadow: var(--shadow-soft);
}

.hero h1 {
  margin: 0;
  max-width: 15em;
  font-size: clamp(28px, 5.6vw, 50px);
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: var(--ink);
  text-wrap: balance;
}

.hero-media {
  position: relative;
  z-index: 1;
  width: min(760px, 100%);
}

.hero-media img {
  width: 100%;
  border-radius: 36px 22px 36px 22px / 26px 38px 22px 38px;
  box-shadow: 0 32px 64px -36px rgba(31, 23, 38, 0.62);
  object-fit: cover;
}

/* 主体 */
main {
  padding: clamp(24px, 5vw, 58px) clamp(12px, 4vw, 40px) 10px;
}

.wrap {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 30px);
  max-width: 1180px;
  margin: 0 auto;
}

.content-sec {
  min-width: 0;
}

.prose {
  padding: clamp(20px, 3.6vw, 44px);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-xl);
  box-shadow: var(--shadow-soft);
  overflow-wrap: break-word;
}

.prose div {
  scroll-margin-top: 124px;
}

.prose div + div {
  margin-top: 42px;
  padding-top: 38px;
  border-top: 1px dashed rgba(139, 69, 19, 0.3);
}

.prose small {
  display: block;
  margin-bottom: 6px;
  font-size: 16px;
  letter-spacing: 0.16em;
  color: var(--brown);
}

.prose h2 {
  margin: 0.2em 0 0.7em;
  font-size: clamp(21px, 2.9vw, 27px);
  line-height: 1.36;
  color: var(--purple-deep);
}

.prose small + h2 {
  margin-top: 0;
}

.prose h3 {
  margin: 1.4em 0 0.5em;
  font-size: 19px;
  line-height: 1.5;
  color: var(--brown);
}

.prose ul,
.prose ol {
  margin: 0 0 1.1em;
  padding-left: 1.3em;
}

.prose li {
  margin: 0.35em 0;
}

.prose li::marker {
  color: var(--purple);
}

.prose a {
  border-bottom: 1px solid rgba(86, 34, 139, 0.34);
}

.prose img {
  margin: 1.2em 0;
  border-radius: var(--r-md);
  box-shadow: var(--shadow-soft);
}

.prose blockquote {
  margin: 1.4em 0;
  padding: 14px 20px;
  color: var(--ink-soft);
  background: var(--purple-soft);
  border-left: 4px solid var(--purple);
  border-radius: 0 var(--r-md) var(--r-md) 0;
}

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

.prose table {
  width: 100%;
  margin: 1.2em 0;
  border-collapse: collapse;
  font-size: 16px;
}

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

.prose th {
  color: var(--purple-deep);
  background: var(--purple-soft);
}

/* 侧栏 */
.side {
  padding: 22px;
  background: linear-gradient(180deg, var(--brown-soft), var(--surface) 62%);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-soft);
}

.side small {
  display: block;
  font-size: 16px;
  letter-spacing: 0.16em;
  color: var(--brown);
}

.side h2 {
  margin: 0.1em 0 0.8em;
  font-size: 20px;
  color: var(--purple-deep);
}

.side ul {
  display: grid;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.side li a {
  display: flex;
  align-items: center;
  min-height: 42px;
  padding: 9px 13px;
  font-size: 16px;
  color: var(--ink-soft);
  background: var(--surface);
  border: 1px solid rgba(139, 69, 19, 0.18);
  border-radius: var(--r-md);
}

.side li a:hover {
  color: #fff;
  background: var(--purple);
  border-color: var(--purple);
}

/* 页脚 */
.site-foot {
  margin-top: 46px;
  padding: clamp(30px, 5vw, 58px) clamp(16px, 4vw, 40px) 26px;
  color: #ece2f4;
  background: linear-gradient(180deg, #251b30, #1f1726);
  border-radius: 44px 44px 0 0;
}

.foot-top,
.foot-cols,
.foot-copy {
  max-width: 1180px;
  margin-left: auto;
  margin-right: auto;
}

.foot-mark {
  margin: 0 0 24px;
  font-size: clamp(36px, 9.5vw, 84px);
  font-weight: 700;
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: rgba(255, 255, 255, 0.15);
  overflow-wrap: break-word;
}

.foot-cols {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.foot-cols address {
  font-size: 16px;
  font-style: normal;
  line-height: 1.85;
  color: #d8cbe6;
}

.foot-cols ul {
  display: grid;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.foot-cols ul a {
  display: inline-flex;
  align-items: center;
  min-height: 42px;
  padding: 2px 0;
  font-size: 16px;
  color: #e9dff2;
}

.foot-cols ul a:hover {
  color: var(--brown-soft);
}

.to-top {
  display: inline-flex;
  align-items: center;
  min-height: 42px;
  margin-top: 12px;
  padding: 4px 16px;
  font-size: 16px;
  color: #e9dff2;
  border: 1px solid rgba(255, 255, 255, 0.24);
  border-radius: 999px;
}

.to-top:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.12);
}

.foot-copy {
  margin-top: 30px;
  padding-top: 18px;
  text-align: center;
  font-size: 16px;
  color: #b6a7c6;
  border-top: 1px solid rgba(255, 255, 255, 0.13);
}

/* 动效 */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.is-in {
  opacity: 1;
  transform: none;
}

/* 响应式 */
@media (max-width: 900px) {
  .nav {
    display: flex;
    flex-direction: column;
    gap: 6px;
  }

  .brand {
    order: -1;
  }

  .nav-side {
    justify-content: center;
  }

  .nav-side.is-right {
    justify-content: center;
  }

  .submenu {
    display: none !important;
  }

  .nav-group::after {
    display: none;
  }

  .nav-group > a {
    padding-right: 11px;
  }
}

@media (min-width: 900px) {
  .site-head {
    position: sticky;
    top: 0;
  }

  .wrap {
    grid-template-columns: minmax(0, 1fr) 292px;
    align-items: start;
  }

  .side {
    position: sticky;
    top: 18px;
  }

  .foot-cols {
    grid-template-columns: 1fr 1fr 1fr;
    gap: 32px;
  }
}

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

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

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