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

:root {
  --ink: #26171a;
  --rose: #eb879c;
  --pink: #ffb6c1;
  --bg: #fff7f8;
  --card: #fffdfd;
  --line: #f1ccd4;
  --muted: #6c5058;
  --link: #a13b52;
  --radius: 28px;
  --shadow: 0 2px 4px rgba(38, 23, 26, 0.05), 0 14px 30px -14px rgba(235, 135, 156, 0.35);
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  overflow-x: clip;
  font-family: 'Space Grotesk', 'Archivo', system-ui, -apple-system, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  font-size: 17px;
  line-height: 1.75;
  color: var(--ink);
  background-color: var(--bg);
  background-image: radial-gradient(rgba(235, 135, 156, 0.14) 1px, transparent 1px);
  background-size: 26px 26px;
}

a {
  color: inherit;
}

:focus-visible {
  outline: 3px solid var(--rose);
  outline-offset: 3px;
  border-radius: 8px;
}

/* 顶部细条与品牌行 */
.ticker {
  margin: 0;
  padding: 10px 20px;
  text-align: center;
  font-size: 16px;
  line-height: 1.4;
  letter-spacing: 0.02em;
  color: #ffe1e8;
  background-color: var(--ink);
  background-image: repeating-linear-gradient(115deg, rgba(255, 182, 193, 0.16) 0 8px, transparent 8px 16px);
}

.masthead {
  display: flex;
  align-items: center;
  max-width: 1180px;
  margin: 0 auto;
  padding: 14px 24px 10px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  padding: 4px 6px 4px 2px;
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.01em;
  text-decoration: none;
  color: var(--ink);
}

.brand-logo {
  width: 36px;
  height: 36px;
  border-radius: 12px;
  object-fit: cover;
}

.mark {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 12px;
  font-size: 16px;
  color: #fff;
  background: linear-gradient(140deg, var(--rose), var(--pink));
  box-shadow: var(--shadow);
}

/* 粘性锚点条 */
.rail {
  position: sticky;
  top: 0;
  z-index: 30;
  background: rgba(255, 247, 248, 0.93);
  backdrop-filter: blur(10px);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.rail > p {
  display: flex;
  gap: 4px;
  max-width: 1180px;
  margin: 0 auto;
  padding: 8px 16px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.rail a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 10px 15px;
  border-radius: 999px;
  font-size: 16px;
  white-space: nowrap;
  text-decoration: none;
  color: var(--ink);
  transition: background-color 0.22s ease, box-shadow 0.22s ease;
}

.rail a:hover {
  background: var(--card);
  box-shadow: var(--shadow);
}

.ic {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--rose);
  box-shadow: 0 0 0 3px rgba(235, 135, 156, 0.22);
}

/* 首屏 */
.hero {
  position: relative;
  display: flex;
  align-items: flex-end;
  justify-content: flex-end;
  min-height: 100vh;
  min-height: 100svh;
  padding: 150px 30px 62px;
  overflow: hidden;
  border-radius: 0 0 64px 64px;
  background-color: #ffe7ec;
  background-image: radial-gradient(rgba(235, 135, 156, 0.42) 1.4px, transparent 1.4px),
    linear-gradient(158deg, #ffffff 0%, #ffe7ec 46%, #ffc9d5 100%);
  background-size: 22px 22px, auto;
}

.hero-img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 118%;
  object-fit: cover;
  will-change: transform;
}

.hero-mask {
  position: absolute;
  inset: 0;
  display: block;
  background: linear-gradient(202deg, rgba(38, 23, 26, 0.14) 0%, rgba(38, 23, 26, 0.56) 58%, rgba(38, 23, 26, 0.84) 100%);
}

.hero-body {
  position: relative;
  max-width: 880px;
  text-align: right;
  color: #fff;
}

.hero-tag {
  margin: 0 0 14px;
  font-size: 16px;
  letter-spacing: 0.34em;
  color: #ffd8e1;
}

.hero h1 {
  margin: 0;
  font-size: clamp(34px, 6.2vw, 68px);
  line-height: 1.14;
  letter-spacing: -0.02em;
  font-weight: 700;
  text-shadow: 0 3px 20px rgba(38, 23, 26, 0.4);
}

/* 主体骨架 */
main {
  display: grid;
  grid-template-columns: 252px minmax(0, 1fr);
  gap: 44px;
  align-items: start;
  max-width: 1180px;
  margin: 0 auto;
  padding: 56px 24px 92px;
}

.side {
  position: sticky;
  top: 86px;
  padding: 22px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--card);
}

.side small {
  display: block;
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--rose);
}

.side h2 {
  margin: 2px 0 14px;
  font-size: 22px;
  line-height: 1.3;
}

.side ol {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: sec;
}

.side li {
  counter-increment: sec;
}

.side li a {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 40px;
  padding: 8px 0;
  font-size: 16px;
  text-decoration: none;
  border-bottom: 1px solid #f8e6ea;
}

.side li a::before {
  content: counter(sec, decimal-leading-zero);
  font-size: 14px;
  color: var(--rose);
  font-variant-numeric: tabular-nums;
}

.side li a:hover {
  color: var(--link);
}

.totop {
  margin: 18px 0 0;
}

.totop a {
  display: inline-flex;
  align-items: center;
  min-height: 42px;
  padding: 8px 16px;
  border-radius: 999px;
  font-size: 16px;
  color: #fff;
  text-decoration: none;
  background: var(--ink);
  transition: transform 0.22s ease;
}

.totop a:hover {
  transform: translateY(-2px);
}

/* 正文 */
.prose {
  min-width: 0;
}

.prose > div {
  padding: 40px 0;
  border-top: 1px solid var(--line);
  scroll-margin-top: 96px;
}

.prose > div:first-child {
  padding-top: 0;
  border-top: 0;
}

.lead {
  padding: 26px 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--card);
}

.lead small {
  display: block;
  margin-bottom: 8px;
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--rose);
}

.lead-text {
  margin: 0;
  font-size: 18px;
  line-height: 1.72;
  color: var(--muted);
}

.prose h2 {
  margin: 0 0 14px;
  font-size: clamp(24px, 3.3vw, 34px);
  line-height: 1.26;
  letter-spacing: -0.01em;
}

.prose h3 {
  margin: 26px 0 10px;
  font-size: 22px;
  line-height: 1.35;
}

.prose p {
  max-width: 68ch;
  margin: 0 0 16px;
}

.prose ul,
.prose ol {
  margin: 0 0 18px;
  padding-left: 1.25em;
}

.prose li {
  margin: 6px 0;
}

.prose strong {
  color: #180d10;
}

.prose a {
  color: var(--link);
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

.prose img {
  max-width: 100%;
  height: auto;
  border-radius: 18px;
}

.prose blockquote {
  margin: 24px 0;
  padding: 18px 22px;
  border-left: 4px solid var(--pink);
  border-radius: 0 18px 18px 0;
  background: var(--card);
}

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

/* 页脚 */
footer {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 28px;
  margin-top: 28px;
  padding: 64px 24px 30px;
  border-radius: 64px 64px 0 0;
  color: #ffe7ec;
  background-color: var(--ink);
  background-image: radial-gradient(rgba(255, 182, 193, 0.18) 1.3px, transparent 1.3px);
  background-size: 22px 22px;
}

.foot-cta {
  grid-column: 1 / -1;
  max-width: 22ch;
  margin: 0;
  font-size: clamp(28px, 5vw, 54px);
  font-weight: 700;
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: #fff;
}

.foot-col {
  margin: 0;
  font-size: 16px;
  line-height: 1.65;
  color: #ffd2db;
}

footer small {
  grid-column: 1 / -1;
  margin-top: 6px;
  padding-top: 20px;
  text-align: center;
  font-size: 16px;
  color: #cfacb4;
  border-top: 1px solid rgba(255, 255, 255, 0.14);
}

/* 滚动进入 */
.js .rv {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.28s ease, transform 0.28s ease;
}

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

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  .js .rv {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .hero-img {
    transform: none !important;
  }
  .totop a {
    transition: none;
  }
}

@media (max-width: 900px) {
  main {
    grid-template-columns: minmax(0, 1fr);
    gap: 30px;
    padding: 38px 18px 68px;
  }
  .side {
    position: static;
    padding: 18px 18px 20px;
  }
  .side ol {
    display: flex;
    flex-wrap: wrap;
    gap: 6px 8px;
  }
  .side li a {
    padding: 8px 12px;
    border: 1px solid var(--line);
    border-radius: 999px;
  }
  .hero {
    padding: 130px 20px 50px;
    border-radius: 0 0 40px 40px;
  }
  .hero-body {
    max-width: 100%;
  }
  footer {
    padding: 48px 20px 26px;
    border-radius: 40px 40px 0 0;
  }
}

@media (max-width: 600px) {
  body {
    font-size: 16px;
  }
  footer {
    grid-template-columns: minmax(0, 1fr);
    gap: 16px;
  }
  .lead {
    padding: 22px 20px;
  }
}

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