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

:root {
  --blue: #c8e0f4;
  --pink: #f5e0e8;
  --ink: #171f26;
  --muted: #4d5a66;
  --up: -6px -6px 14px rgba(255, 255, 255, 0.95);
  --dn: 7px 7px 18px rgba(23, 31, 38, 0.13);
  --in: inset 3px 3px 8px rgba(23, 31, 38, 0.11), inset -3px -3px 8px rgba(255, 255, 255, 0.92);
  --r: 16px;
}

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

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

body {
  margin: 0;
  overflow-x: hidden;
  font-size: 17px;
  line-height: 1.75;
  color: var(--ink);
  font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'PingFang SC',
    'Hiragino Sans GB', 'Microsoft YaHei', 'Segoe UI', sans-serif;
  background:
    radial-gradient(720px 400px at 92% -8%, rgba(245, 224, 232, 0.78), transparent 62%),
    radial-gradient(620px 380px at 2% 8%, rgba(200, 224, 244, 0.85), transparent 58%),
    linear-gradient(168deg, #eef4fa 0%, #e6edf6 68%, #e9eff6 100%);
}

img {
  max-width: 100%;
}

a {
  color: var(--ink);
}

article[id] {
  scroll-margin-top: 24px;
}

.topstrip {
  position: relative;
  z-index: 4;
  padding: 5px 0;
  background: linear-gradient(145deg, #e2edf8, #f3f8fd);
  box-shadow: 0 8px 16px rgba(23, 31, 38, 0.06);
}

.topstrip .wrap {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 46px;
  padding: 0 6px;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-decoration: none;
  color: var(--ink);
}

.brand .mark {
  width: 28px;
  height: 28px;
  border-radius: 9px;
  object-fit: cover;
  box-shadow: var(--up), var(--dn);
}

.shell {
  max-width: 1180px;
  margin: 0 auto;
  padding: 20px 16px 60px;
  display: grid;
  grid-template-columns: 248px minmax(0, 1fr);
  gap: 26px;
  align-items: start;
}

/* 左侧栏 */
.side {
  position: sticky;
  top: 14px;
  padding: 16px 14px 18px;
  border-radius: var(--r);
  background: linear-gradient(150deg, #eef5fb, #e4ecf6);
  box-shadow: var(--up), var(--dn);
}

.side-h {
  display: flex;
  align-items: center;
  margin: 0 0 10px;
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--muted);
}

.side-h > span {
  position: relative;
  padding-left: 14px;
}

.side-h > span::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  width: 7px;
  height: 7px;
  margin-top: -4px;
  border-radius: 50%;
  background: var(--blue);
  box-shadow: 1px 1px 3px rgba(23, 31, 38, 0.2);
}

.side-h2 {
  margin-top: 18px;
}

.side-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 9px;
}

.side-nav a {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 4px 14px;
  font-size: 16px;
  font-weight: 500;
  text-decoration: none;
  color: var(--ink);
  border-radius: 12px;
  background: linear-gradient(145deg, #f3f8fd, #e4ecf6);
  box-shadow: var(--up), var(--dn);
  transition: transform 150ms ease, box-shadow 150ms ease;
}

.side-nav a:hover {
  transform: translateY(-1px);
}

.side-nav a:active {
  box-shadow: var(--in);
  transform: scale(0.985);
}

.side-nav a:focus-visible,
.totop:focus-visible,
.brand:focus-visible {
  outline: 2px solid #6e9fc4;
  outline-offset: 2px;
}

.nv-i.has-menu > a::after {
  content: '＋';
  margin-left: auto;
  font-size: 14px;
  color: var(--muted);
  opacity: 0.7;
}

.nv-sub {
  list-style: none;
  margin: 0;
  padding: 6px 0 0 10px;
  display: grid;
  gap: 8px;
}

.totop {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 14px;
  font-size: 16px;
  text-decoration: none;
  color: var(--muted);
  border-radius: 12px;
  background: linear-gradient(145deg, #f3f8fd, #e4ecf6);
  box-shadow: var(--up), var(--dn);
}

.totop:active {
  box-shadow: var(--in);
}

/* 主区 */
main {
  min-width: 0;
}

.hero {
  position: relative;
  min-height: 70vh;
  display: flex;
  align-items: flex-end;
  justify-content: flex-end;
  overflow: hidden;
  border-radius: 20px 20px 50% 50% / 20px 20px 88px 88px;
  background: linear-gradient(145deg, #d8e9f7, #eef5fb 52%, #f7e6ee);
  box-shadow: var(--up), var(--dn);
}

.hero-media {
  position: absolute;
  inset: 0;
}

.hero-media::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(234, 241, 248, 0.94), rgba(234, 241, 248, 0.08) 72%);
}

.hero-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transform: scale(1.18);
  will-change: transform;
}

.hero-copy {
  position: relative;
  z-index: 1;
  max-width: 720px;
  padding: 30px 26px 84px;
  text-align: right;
}

.hero h1 {
  margin: 0;
  font-size: clamp(28px, 4.6vw, 50px);
  line-height: 1.24;
  font-weight: 700;
  letter-spacing: -0.01em;
}

/* 正文 */
.doc {
  display: grid;
  gap: 22px;
  margin-top: 26px;
}

.doc > article {
  padding: 26px 22px;
  border-radius: 4px;
  border-bottom: 3px solid var(--blue);
  background: linear-gradient(148deg, #f5f9fd, #e7eef8);
  box-shadow: var(--up), var(--dn);
}

.doc > article:nth-child(even) {
  border-bottom-color: var(--pink);
}

.doc h2 {
  margin: 0 0 12px;
  font-size: clamp(21px, 2.4vw, 28px);
  line-height: 1.35;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.doc h2 > span {
  position: relative;
  display: inline-block;
  padding-bottom: 7px;
}

.doc h2 > span::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 2.4em;
  height: 4px;
  border-radius: 4px;
  background: linear-gradient(90deg, var(--blue), var(--pink));
}

.doc h3 {
  margin: 22px 0 8px;
  font-size: 19px;
  line-height: 1.4;
  font-weight: 600;
}

.doc p {
  margin: 0 0 14px;
}

.doc ul,
.doc ol {
  margin: 0 0 14px;
  padding-left: 22px;
}

.doc li {
  margin-bottom: 6px;
}

.doc a {
  color: #17567f;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.doc blockquote {
  margin: 16px 0;
  padding: 14px 16px;
  border-radius: 12px;
  background: #e9f0f8;
  box-shadow: var(--in);
}

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

.doc img {
  border-radius: 12px;
  box-shadow: var(--up), var(--dn);
}

.doc table {
  width: 100%;
  border-collapse: collapse;
  font-size: 16px;
}

.doc th,
.doc td {
  padding: 10px;
  text-align: left;
  border-bottom: 1px solid rgba(23, 31, 38, 0.12);
}

.doc time {
  font-size: 16px;
  color: var(--muted);
}

/* 页脚 */
.foot {
  max-width: 1180px;
  margin: 0 auto;
  padding: 26px 16px 42px;
}

.footmark {
  display: inline-block;
  text-decoration: none;
}

.footmark h2 {
  margin: 0;
  font-size: clamp(38px, 10vw, 104px);
  line-height: 1;
  font-weight: 700;
  letter-spacing: -0.035em;
  background: linear-gradient(118deg, #1b587f, #a9788f);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.footcols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin: 22px 0 18px;
  padding: 20px 18px;
  border-radius: var(--r);
  background: linear-gradient(150deg, #eef5fb, #e3ebf5);
  box-shadow: var(--up), var(--dn);
}

.footcols dl {
  margin: 0;
}

.footcols dt {
  margin-bottom: 6px;
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.footcols dd {
  margin: 0;
}

.footcols dd a {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 2px 0;
  font-size: 16px;
  text-decoration: none;
}

.footcols dd a:hover {
  text-decoration: underline;
}

.copy {
  margin: 0;
  font-size: 16px;
  color: var(--muted);
}

/* 入场动画 */
.st {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.st.in {
  opacity: 1;
  transform: none;
}

@media (min-width: 881px) {
  .nv-i.has-menu {
    position: relative;
  }

  .nv-sub {
    position: absolute;
    left: 0;
    top: calc(100% + 6px);
    z-index: 6;
    min-width: 196px;
    padding: 10px;
    border-radius: 12px;
    background: #eef4fa;
    box-shadow: var(--up), var(--dn);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-6px);
    transition: opacity 180ms ease, transform 180ms ease, visibility 180ms;
  }

  .nv-i.has-menu:hover .nv-sub,
  .nv-i.has-menu:focus-within .nv-sub {
    opacity: 1;
    visibility: visible;
    transform: none;
  }
}

@media (max-width: 880px) {
  .shell {
    grid-template-columns: 1fr;
    gap: 20px;
    padding-top: 16px;
  }

  .side {
    position: static;
    order: 2;
  }

  main {
    order: 1;
  }

  .hero {
    min-height: 44vh;
    border-radius: 16px 16px 50% 50% / 16px 16px 60px 60px;
  }

  .hero-copy {
    padding: 24px 20px 56px;
  }

  .side-nav ul {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .nv-sub {
    grid-column: 1 / -1;
    padding-left: 12px;
  }

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

@media (max-width: 420px) {
  body {
    font-size: 16px;
  }

  .doc > article {
    padding: 22px 16px;
  }

  .hero h1 {
    font-size: 27px;
  }
}

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

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

  .hero-img {
    transform: none;
  }
}

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