@import url('https://fonts.googleapis.com/css2?family=Abril+Fatface&family=Merriweather:wght@300;400;700&display=swap');

:root {
  --paper: #fdfbf7;
  --paper-2: #f5f5f5;
  --ink: #1a1a1a;
  --ink-soft: #4a4742;
  --rule: #e0ded6;
  --dot: rgba(26, 26, 26, 0.16);
  --serif: "Merriweather", Georgia, "Songti SC", "SimSun", "Noto Serif SC", serif;
  --display: "Abril Fatface", "Songti SC", "SimSun", Georgia, serif;
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  padding: 0 0 6.5rem;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1.85;
  overflow-x: clip;
  text-rendering: optimizeLegibility;
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 30;
  pointer-events: none;
  opacity: 0.05;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)' opacity='0.55'/%3E%3C/svg%3E");
}

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

a {
  color: var(--ink);
  text-underline-offset: 3px;
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 3px;
}

/* 底部胶囊导航条 */
.dock {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.5rem 0.7rem calc(0.5rem + env(safe-area-inset-bottom, 0px));
  background: var(--paper);
  border-top: 1px solid var(--ink);
}

.brand {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 0.65rem 0 0.2rem;
  font-family: var(--display);
  font-size: 1.05rem;
  letter-spacing: 0.05em;
  text-decoration: none;
  border-right: 1px dotted var(--rule);
}

.dock-nav {
  flex: 1 1 auto;
  min-width: 0;
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.dock-nav::-webkit-scrollbar {
  display: none;
}

.dock-nav p {
  display: flex;
  gap: 0.35rem;
  margin: 0;
  padding: 0;
}

.dock-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0.3rem 0.95rem;
  border: 1px solid var(--ink);
  border-radius: 999px;
  font-size: 1rem;
  line-height: 1.2;
  white-space: nowrap;
  text-decoration: none;
  background: var(--paper);
}

.dock-nav a.on {
  background: var(--ink);
  color: var(--paper);
}

/* 首屏 */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  align-items: flex-end;
  overflow: hidden;
  background-color: var(--ink);
  background-image: radial-gradient(rgba(253, 251, 247, 0.18) 1px, transparent 1px);
  background-size: 18px 18px;
  border-bottom: 1px solid var(--ink);
}

.hero-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(1) contrast(1.08);
  z-index: 0;
}

.hero-mask {
  position: absolute;
  inset: 0;
  z-index: 1;
  background: rgba(26, 26, 26, 0.6);
}

.hero-inner {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: 1140px;
  margin: 0 auto;
  padding: 5rem 1.15rem 7.5rem;
  color: var(--paper);
}

.hero h1 {
  margin: 0 0 1rem;
  font-family: var(--display);
  font-weight: 400;
  font-size: clamp(2rem, 6.6vw, 4.1rem);
  line-height: 1.18;
  letter-spacing: 0.01em;
  max-width: 22ch;
}

.lede {
  margin: 0 0 1.6rem;
  max-width: 34rem;
  font-size: 1.02rem;
  line-height: 1.8;
  color: #f0ede6;
}

.jump {
  display: inline-flex;
  align-items: center;
  min-height: 46px;
  padding: 0.45rem 1.4rem;
  border: 1px solid var(--paper);
  border-radius: 999px;
  color: var(--paper);
  text-decoration: none;
  font-size: 1rem;
}

.jump:hover {
  background: var(--paper);
  color: var(--ink);
}

/* 正文与右栏 */
main {
  display: block;
}

.wrap {
  max-width: 1160px;
  margin: 0 auto;
  padding: 3.2rem 1.15rem 4rem;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 250px;
  gap: 2.6rem;
  align-items: start;
}

.stage {
  min-width: 0;
}

.prose {
  max-width: 72ch;
}

.prose > article {
  padding: 2.6rem 0;
  border-top: 1px dotted var(--rule);
}

.prose > article:first-child {
  border-top: 0;
  padding-top: 0.2rem;
}

.prose h2 {
  margin: 0.1rem 0 0.9rem;
  font-family: var(--display);
  font-weight: 400;
  font-size: clamp(1.5rem, 3.4vw, 2.05rem);
  line-height: 1.34;
}

.prose h3 {
  margin: 1.6rem 0 0.6rem;
  font-family: var(--display);
  font-weight: 400;
  font-size: 1.28rem;
  line-height: 1.45;
}

.prose p {
  margin: 0 0 1.05rem;
}

.prose small {
  display: block;
  margin-bottom: 0.35rem;
  font-family: var(--serif);
  font-size: 0.98rem;
  letter-spacing: 0.26em;
  color: var(--ink-soft);
}

.prose ul,
.prose ol {
  margin: 0 0 1.1rem;
  padding-left: 1.25rem;
}

.prose li {
  margin-bottom: 0.4rem;
}

.prose blockquote {
  margin: 1.4rem 0;
  padding: 0.15rem 0 0.15rem 1rem;
  border-left: 3px solid var(--ink);
  color: var(--ink-soft);
}

.prose img {
  filter: grayscale(1);
  border: 1px solid var(--rule);
}

.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.2rem 0;
  font-size: 1rem;
}

.prose th,
.prose td {
  border: 1px solid var(--rule);
  padding: 0.5rem 0.65rem;
  text-align: left;
}

.side {
  position: sticky;
  top: 2rem;
  padding-left: 1.1rem;
  border-left: 1px solid var(--rule);
}

.side small {
  display: block;
  font-size: 0.98rem;
  letter-spacing: 0.28em;
  color: var(--ink-soft);
}

.side h2 {
  margin: 0.2rem 0 1rem;
  font-family: var(--display);
  font-weight: 400;
  font-size: 1.22rem;
}

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

.side-list li + li {
  border-top: 1px dotted var(--rule);
}

.side-list a {
  display: flex;
  gap: 0.6rem;
  align-items: center;
  min-height: 44px;
  padding: 0.25rem 0;
  font-size: 1rem;
  text-decoration: none;
}

.side-list a:hover {
  text-decoration: underline;
}

.num {
  font-family: var(--display);
  font-size: 0.92rem;
  color: var(--ink-soft);
}

/* 页脚 */
.foot {
  background: var(--ink);
  color: var(--paper);
  padding: 3.2rem 1.15rem 3rem;
}

.foot-cta {
  max-width: 1160px;
  margin: 0 auto 2.6rem;
  padding-bottom: 2.2rem;
  border-bottom: 1px solid rgba(253, 251, 247, 0.25);
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1.2rem;
}

.cta-big {
  margin: 0;
  font-family: var(--display);
  font-size: clamp(1.8rem, 6vw, 3rem);
  line-height: 1.2;
  color: var(--paper);
}

.cta-btn {
  display: inline-flex;
  align-items: center;
  min-height: 46px;
  padding: 0.4rem 1.3rem;
  border: 1px solid var(--paper);
  border-radius: 999px;
  color: var(--paper);
  text-decoration: none;
  font-size: 1rem;
}

.cta-btn:hover {
  background: var(--paper);
  color: var(--ink);
}

.foot-grid {
  max-width: 1160px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 1.5rem;
}

.fcol address {
  font-style: normal;
  font-family: var(--display);
  font-size: 1.15rem;
  letter-spacing: 0.04em;
  color: var(--paper);
}

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

.fcol a {
  display: inline-flex;
  align-items: center;
  min-height: 42px;
  color: #e9e5dd;
  text-decoration: none;
  font-size: 1rem;
}

.fcol a:hover {
  color: var(--paper);
  text-decoration: underline;
}

.copy {
  max-width: 1160px;
  margin: 2.4rem auto 0;
  padding-top: 1.1rem;
  border-top: 1px solid rgba(253, 251, 247, 0.25);
  font-size: 1rem;
  color: #d9d4cb;
}

/* 入场 */
.rv {
  opacity: 0;
  transform: translateY(9px);
  transition: opacity 0.24s linear, transform 0.24s linear;
}

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

@media (max-width: 900px) {
  .wrap {
    grid-template-columns: minmax(0, 1fr);
    gap: 2.2rem;
    padding: 2.4rem 1.1rem 3rem;
  }

  .side {
    position: static;
    padding: 1.2rem 0 0;
    border-left: 0;
    border-top: 1px solid var(--ink);
  }

  .prose {
    max-width: none;
  }

  .foot-grid {
    grid-template-columns: 1fr 1fr;
    gap: 1.2rem 1.4rem;
  }

  .hero-inner {
    padding: 4.5rem 1.1rem 6.6rem;
  }
}

@media (max-width: 420px) {
  body {
    font-size: 17px;
  }

  .brand {
    font-size: 0.98rem;
    padding-right: 0.45rem;
  }

  .dock-nav a {
    padding: 0.3rem 0.8rem;
  }

  .hero h1 {
    font-size: clamp(1.85rem, 8.4vw, 2.4rem);
  }
}

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

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

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