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

:root {
  --mint: #b4fde1;
  --sky: #add8e6;
  --ink: #172620;
  --paper: #f4fdf9;
  --glass: rgba(255, 255, 255, 0.74);
  --edge: 3px solid var(--ink);
  --shadow-out: 7px 9px 22px rgba(23, 38, 32, 0.17);
  --shadow-in: inset -3px -3px 12px rgba(23, 38, 32, 0.1);
  --radius: 24px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 168px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  padding-top: 92px;
  font-family: 'Public Sans', system-ui, -apple-system, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  font-size: 17px;
  line-height: 1.78;
  color: var(--ink);
  overflow-x: hidden;
  background-color: var(--paper);
  background-image:
    radial-gradient(58vw 58vw at 90% 4%, rgba(173, 216, 230, 0.55), transparent 62%),
    radial-gradient(52vw 52vw at 4% 28%, rgba(180, 253, 225, 0.7), transparent 60%),
    radial-gradient(74vw 54vw at 52% 102%, rgba(180, 253, 225, 0.55), transparent 66%),
    linear-gradient(180deg, #f8fffc 0%, #eef8f5 55%, #f4fdf9 100%);
  background-attachment: fixed;
}

body.has-menu {
  overflow: hidden;
}

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

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

h1,
h2,
h3 {
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.01em;
}

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

/* ---------- 顶栏 ---------- */
.topbar {
  position: fixed;
  z-index: 60;
  top: 14px;
  left: 14px;
  right: 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 7px 10px;
  border: var(--edge);
  border-radius: 999px;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.95), rgba(180, 253, 225, 0.8));
  box-shadow: inset -2px -2px 8px rgba(23, 38, 32, 0.1), 6px 7px 16px rgba(23, 38, 32, 0.18);
  backdrop-filter: blur(8px);
}

.brand-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  border: var(--edge);
  border-radius: 15px;
  background: linear-gradient(160deg, var(--mint), var(--sky));
  box-shadow: inset -2px -2px 7px rgba(23, 38, 32, 0.14), 3px 3px 8px rgba(23, 38, 32, 0.16);
  text-decoration: none;
  transition: transform 0.2s ease-out;
}

.brand-icon:active {
  transform: translateY(2px);
}

.mark {
  width: 100%;
  height: 100%;
  object-fit: contain;
  border-radius: 12px;
}

.mark-text {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  font-weight: 700;
  border-radius: 12px;
  background: transparent;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.cta {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 18px;
  border: var(--edge);
  border-radius: 999px;
  background: linear-gradient(140deg, var(--mint), var(--sky));
  box-shadow: inset -2px -2px 8px rgba(23, 38, 32, 0.12), 4px 4px 10px rgba(23, 38, 32, 0.18);
  font-size: 16px;
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
  transition: transform 0.2s ease-out, box-shadow 0.2s ease-out;
}

.cta:active {
  transform: translateY(2px);
  box-shadow: inset -2px -2px 6px rgba(23, 38, 32, 0.18), 2px 2px 5px rgba(23, 38, 32, 0.16);
}

.burger {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 16px;
  border: var(--edge);
  border-radius: 999px;
  background: #fff;
  color: var(--ink);
  font-family: inherit;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  box-shadow: inset -2px -2px 8px rgba(23, 38, 32, 0.08), 4px 4px 10px rgba(23, 38, 32, 0.14);
  transition: transform 0.2s ease-out;
}

.burger:active {
  transform: translateY(2px);
}

.bars {
  display: grid;
  gap: 3px;
}

.bars i {
  display: block;
  width: 16px;
  height: 3px;
  border-radius: 2px;
  background: var(--ink);
}

.bt-close {
  display: none;
}

.burger[aria-expanded='true'] .bt-open {
  display: none;
}

.burger[aria-expanded='true'] .bt-close {
  display: inline;
}

/* ---------- 全屏菜单 ---------- */
.site-menu {
  position: fixed;
  z-index: 55;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 104px 20px 32px;
  overflow-y: auto;
  background: linear-gradient(160deg, #ddfff2 0%, #d9edf8 58%, #effbf6 100%);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-14px) scale(0.985);
  transition: opacity 0.26s ease-out, transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1), visibility 0.26s linear;
}

.site-menu.is-open {
  opacity: 1;
  visibility: visible;
  transform: none;
}

.site-menu nav {
  width: min(560px, 100%);
}

.site-menu ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.site-menu a {
  display: flex;
  align-items: center;
  min-height: 56px;
  padding: 12px 22px;
  border: var(--edge);
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.86);
  box-shadow: inset -2px -2px 9px rgba(23, 38, 32, 0.09), 5px 5px 12px rgba(23, 38, 32, 0.16);
  font-size: 18px;
  font-weight: 600;
  text-decoration: none;
  transition: transform 0.2s ease-out, background 0.2s ease-out;
}

.site-menu a:hover {
  transform: translateX(4px);
  background: var(--mint);
}

/* ---------- 粘性锚点条 ---------- */
.chips {
  position: sticky;
  top: 86px;
  z-index: 50;
  max-width: 1180px;
  margin: 0 auto 18px;
  padding: 0 clamp(14px, 4vw, 40px);
}

.chips-track {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 7px;
  border: var(--edge);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.78);
  box-shadow: inset -2px -2px 9px rgba(23, 38, 32, 0.09), 4px 4px 12px rgba(23, 38, 32, 0.14);
  backdrop-filter: blur(9px);
  scrollbar-width: thin;
}

.chips-track a {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 6px 14px;
  border: 2px solid rgba(23, 38, 32, 0.45);
  border-radius: 999px;
  background: #fff;
  font-size: 16px;
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
}

.chips-track a:active {
  background: var(--mint);
}

/* ---------- 首屏 ---------- */
.hero {
  position: relative;
  display: grid;
  grid-template-columns: 1.02fr 1fr;
  gap: clamp(18px, 4vw, 52px);
  align-items: center;
  min-height: 70vh;
  max-width: 1240px;
  margin: 0 auto;
  padding: 26px clamp(16px, 4vw, 48px) 46px;
  overflow: hidden;
}

.hero-watermark {
  position: absolute;
  right: -0.04em;
  top: 8%;
  z-index: 0;
  font-family: 'Libre Bodoni', 'Songti SC', serif;
  font-size: clamp(96px, 19vw, 230px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.02em;
  white-space: nowrap;
  color: transparent;
  -webkit-text-stroke: 2px rgba(23, 38, 32, 0.16);
  pointer-events: none;
  user-select: none;
}

.hero-art {
  position: relative;
  z-index: 1;
  margin: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  aspect-ratio: 4 / 3.4;
  overflow: hidden;
  border: 4px solid var(--ink);
  border-radius: 32px;
  background: linear-gradient(150deg, var(--mint), var(--sky));
  box-shadow: inset -7px -7px 20px rgba(23, 38, 32, 0.15), 13px 15px 30px rgba(23, 38, 32, 0.2);
}

.hero-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  transition: opacity 0.9s ease;
}

.hero-img.is-active {
  opacity: 1;
}

.hero-blob {
  width: 60%;
  aspect-ratio: 1;
  border-radius: 50%;
  background:
    radial-gradient(circle at 34% 28%, rgba(255, 255, 255, 0.95), rgba(255, 255, 255, 0.15) 56%, transparent 72%),
    linear-gradient(150deg, var(--mint), var(--sky));
  box-shadow: inset -6px -6px 18px rgba(23, 38, 32, 0.16), 10px 12px 24px rgba(23, 38, 32, 0.18);
  animation: float 7s ease-in-out infinite;
}

@keyframes float {
  50% {
    transform: translateY(-12px);
  }
}

.hero-copy {
  position: relative;
  z-index: 1;
  text-align: right;
}

.hero-copy h1 {
  margin: 0 0 14px;
  font-size: clamp(30px, 4.6vw, 54px);
  line-height: 1.16;
}

.hero-copy .subtitle {
  margin: 0 0 0 auto;
  max-width: 44ch;
  font-size: 17px;
  color: rgba(23, 38, 32, 0.82);
}

/* ---------- 主体 ---------- */
.body-wrap {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 302px;
  gap: clamp(18px, 3vw, 36px);
  align-items: start;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 clamp(14px, 4vw, 40px) 72px;
}

.prose {
  min-width: 0;
}

.prose article {
  position: relative;
  margin: 0 0 22px;
  padding: clamp(20px, 3vw, 34px);
  border: var(--edge);
  border-radius: 28px;
  background: rgba(255, 255, 255, 0.8);
  box-shadow: var(--shadow-in), var(--shadow-out);
  backdrop-filter: blur(5px);
}

.prose article[id] {
  scroll-margin-top: 168px;
}

.prose article:nth-child(even) {
  background: linear-gradient(158deg, rgba(255, 255, 255, 0.9), rgba(180, 253, 225, 0.42));
}

.prose h2 {
  margin: 0 0 10px;
  font-size: clamp(21px, 2.6vw, 28px);
}

.prose h3 {
  margin: 24px 0 8px;
  font-size: 19px;
}

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

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

.prose a {
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

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

.prose li {
  margin-bottom: 8px;
}

.prose figure,
.prose aside {
  margin: 18px 0;
  padding: 16px 18px;
  border: 2px solid rgba(23, 38, 32, 0.35);
  border-radius: 20px;
  background: rgba(173, 216, 230, 0.28);
}

.prose figcaption {
  margin-top: 8px;
  font-size: 16px;
  color: rgba(23, 38, 32, 0.72);
}

.prose blockquote {
  margin: 18px 0;
  padding: 14px 20px;
  border-left: 5px solid var(--ink);
  border-radius: 0 18px 18px 0;
  background: rgba(180, 253, 225, 0.45);
}

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

.prose img {
  border: 3px solid var(--ink);
  border-radius: 20px;
}

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

.prose th,
.prose td {
  padding: 10px 12px;
  border: 2px solid rgba(23, 38, 32, 0.4);
  text-align: left;
}

.prose th {
  background: rgba(180, 253, 225, 0.6);
}

.prose code {
  padding: 2px 6px;
  border-radius: 8px;
  background: rgba(23, 38, 32, 0.08);
  font-size: 16px;
}

/* ---------- 侧栏 ---------- */
.rail {
  position: sticky;
  top: 152px;
  padding: 20px 18px;
  border: var(--edge);
  border-radius: 28px;
  background: var(--glass);
  box-shadow: inset -3px -3px 12px rgba(23, 38, 32, 0.1), 7px 9px 22px rgba(23, 38, 32, 0.16);
  backdrop-filter: blur(8px);
}

.rail h2 {
  margin: 0;
  font-size: 19px;
}

.rail .subtitle {
  margin: 2px 0 14px;
  font-size: 16px;
  color: rgba(23, 38, 32, 0.66);
}

.rail-list {
  list-style: none;
  margin: 0 0 14px;
  padding: 0;
  display: grid;
  gap: 7px;
}

.rail-list a {
  display: flex;
  align-items: center;
  min-height: 40px;
  padding: 5px 12px;
  border: 2px solid rgba(23, 38, 32, 0.4);
  border-radius: 14px;
  background: #fff;
  font-size: 16px;
  font-weight: 600;
  text-decoration: none;
  transition: background 0.18s ease-out, transform 0.18s ease-out;
}

.rail-list a:hover {
  background: var(--mint);
  transform: translateX(3px);
}

.to-top {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  border: var(--edge);
  border-radius: 999px;
  background: linear-gradient(140deg, var(--sky), var(--mint));
  box-shadow: inset -2px -2px 8px rgba(23, 38, 32, 0.12), 4px 4px 10px rgba(23, 38, 32, 0.16);
  font-size: 16px;
  font-weight: 700;
  text-decoration: none;
}

/* ---------- 页脚 ---------- */
footer {
  display: grid;
  gap: 20px;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 clamp(16px, 4vw, 40px) 48px;
}

.foot-cta {
  display: flex;
  justify-content: center;
  padding: clamp(22px, 4vw, 38px) 20px;
  border: 4px solid var(--ink);
  border-radius: 32px;
  background: linear-gradient(140deg, var(--mint), var(--sky));
  box-shadow: inset -6px -6px 18px rgba(23, 38, 32, 0.14), 12px 14px 28px rgba(23, 38, 32, 0.2);
}

.big-cta {
  display: inline-flex;
  align-items: center;
  min-height: 54px;
  padding: 0 34px;
  border: var(--edge);
  border-radius: 999px;
  background: #fff;
  box-shadow: inset -2px -2px 8px rgba(23, 38, 32, 0.1), 5px 5px 12px rgba(23, 38, 32, 0.18);
  font-size: 18px;
  font-weight: 700;
  text-decoration: none;
  transition: transform 0.2s ease-out;
}

.big-cta:active {
  transform: translateY(2px);
}

.foot-row {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 12px 18px;
  align-items: center;
  padding-top: 16px;
  border-top: 3px dashed rgba(23, 38, 32, 0.35);
}

.foot-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border: var(--edge);
  border-radius: 14px;
  background: #fff;
  text-decoration: none;
}

.foot-copy {
  margin: 0;
  font-size: 16px;
  text-align: center;
  color: rgba(23, 38, 32, 0.78);
}

footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 2px;
  justify-content: flex-end;
}

footer nav a {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 4px 9px;
  border-radius: 999px;
  font-size: 16px;
  text-decoration: none;
}

footer nav a:hover {
  background: rgba(180, 253, 225, 0.8);
}

/* ---------- 断点 ---------- */
@media (max-width: 900px) {
  .body-wrap {
    grid-template-columns: minmax(0, 1fr);
  }

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

  .foot-row {
    grid-template-columns: 1fr;
    justify-items: center;
    text-align: center;
  }

  footer nav {
    justify-content: center;
  }
}

@media (max-width: 720px) {
  body {
    padding-top: 84px;
    font-size: 16px;
  }

  .topbar {
    top: 10px;
    left: 10px;
    right: 10px;
    padding: 6px 8px;
  }

  .brand-icon {
    width: 42px;
    height: 42px;
    border-radius: 13px;
  }

  .burger {
    padding: 0 13px;
  }

  .cta {
    padding: 0 13px;
  }

  .chips {
    top: 76px;
    margin-bottom: 14px;
  }

  .hero {
    grid-template-columns: minmax(0, 1fr);
    min-height: 0;
    padding: 14px 14px 34px;
    gap: 18px;
  }

  .hero-copy {
    order: -1;
  }

  .hero-copy .subtitle {
    margin-left: 0;
  }

  .hero-watermark {
    top: 34%;
    font-size: clamp(78px, 26vw, 130px);
  }

  .hero-art {
    aspect-ratio: 4 / 3;
    border-radius: 26px;
  }

  .prose article {
    border-radius: 24px;
  }
}

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

  .hero-blob {
    animation: none;
  }

  * {
    transition-duration: 0.01ms !important;
  }
}

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