:root {
  --ink: #171f26;
  --ink-2: #3d4b57;
  --ink-3: #6d7d89;
  --blue: #c8e0f4;
  --pink: #f5e0e8;
  --bg-a: #dfeaf5;
  --bg-b: #f3e6ec;
  --surf: #e9f0f8;
  --up: -6px -6px 14px rgba(255, 255, 255, 0.92), 7px 7px 16px rgba(23, 31, 38, 0.14);
  --up-s: -3px -3px 8px rgba(255, 255, 255, 0.92), 4px 4px 10px rgba(23, 31, 38, 0.12);
  --in: inset -4px -4px 10px rgba(255, 255, 255, 0.85), inset 5px 5px 12px rgba(23, 31, 38, 0.14);
  --r: 14px;
}

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

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

body {
  margin: 0;
  font-family: 'Outfit', 'Work Sans', system-ui, -apple-system, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  font-size: 17px;
  line-height: 1.75;
  color: var(--ink);
  background: linear-gradient(160deg, var(--bg-a) 0%, #eef0f6 48%, var(--bg-b) 100%);
  background-attachment: fixed;
  overflow-x: hidden;
}

a {
  color: var(--ink);
  text-decoration: none;
}

img {
  max-width: 100%;
}

h1,
h2,
h3 {
  margin: 0 0 0.6em;
  line-height: 1.3;
  font-weight: 600;
  letter-spacing: 0.01em;
}

p {
  margin: 0 0 1em;
}

:focus-visible {
  outline: 2px solid #356a92;
  outline-offset: 3px;
  border-radius: 6px;
}

.announce {
  padding: 8px 16px;
  font-size: 16px;
  line-height: 1.5;
  text-align: center;
  color: var(--ink-2);
  background: var(--pink);
  box-shadow: 0 6px 14px rgba(23, 31, 38, 0.08);
}

.announce b {
  color: var(--ink);
  font-weight: 600;
}

.top {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  max-width: 1180px;
  margin: 0 auto;
  padding: 14px 18px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 46px;
  padding: 0 16px 0 7px;
  border-radius: var(--r);
  font-size: 19px;
  font-weight: 600;
  letter-spacing: 0.05em;
  box-shadow: var(--up-s);
  transition: box-shadow 0.15s ease, transform 0.15s ease;
}

.brand:hover {
  transform: translateY(-1px);
}

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

.brand img {
  display: block;
  width: 32px;
  height: 32px;
  border-radius: 9px;
}

.mark {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border-radius: 9px;
  font-size: 15px;
  color: var(--ink);
  background: linear-gradient(145deg, var(--blue), var(--pink));
  box-shadow: var(--in);
}

.top nav {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.top nav a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 13px;
  border-radius: var(--r);
  font-size: 16px;
  color: var(--ink-2);
  transition: box-shadow 0.15s ease, transform 0.15s ease, color 0.15s ease;
}

.top nav a:hover,
.top nav a:focus-visible {
  color: var(--ink);
  box-shadow: var(--up-s);
  transform: translateY(-1px);
}

.rail {
  position: sticky;
  top: 0;
  z-index: 30;
  padding: 8px 12px;
  background: rgba(233, 240, 248, 0.88);
  backdrop-filter: blur(8px);
  box-shadow: 0 8px 18px rgba(23, 31, 38, 0.1);
}

.rail-in {
  display: flex;
  gap: 8px;
  max-width: 1180px;
  margin: 0 auto;
  overflow-x: auto;
  scrollbar-width: none;
}

.rail-in::-webkit-scrollbar {
  display: none;
}

.chip {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 14px;
  border-radius: var(--r);
  font-size: 16px;
  color: var(--ink-2);
  background: var(--surf);
  box-shadow: var(--up-s);
  transition: transform 0.15s ease, box-shadow 0.15s ease, color 0.15s ease;
}

.chip:hover {
  color: var(--ink);
  transform: translateY(-1px);
}

.chip:active {
  box-shadow: var(--in);
  transform: scale(0.97);
}

.hero {
  position: relative;
  display: grid;
  grid-template-columns: 38% minmax(0, 1fr);
  align-items: center;
  gap: 16px;
  min-height: 100vh;
  max-width: 1180px;
  margin: 0 auto;
  padding: 22px 18px 40px;
  overflow: clip;
}

.hero-num {
  position: absolute;
  right: 4px;
  bottom: 4px;
  z-index: 0;
  font-size: clamp(96px, 30vw, 290px);
  font-weight: 700;
  line-height: 0.8;
  letter-spacing: -0.04em;
  color: #e8f0f8;
  text-shadow: -4px -4px 10px #ffffff, 6px 6px 14px rgba(23, 31, 38, 0.16);
  pointer-events: none;
  will-change: transform;
}

.hero-visual {
  position: relative;
  z-index: 1;
  aspect-ratio: 3 / 4;
  padding: 10px;
  border-radius: var(--r);
  background: linear-gradient(145deg, #e6eff8, #f7ebf0);
  box-shadow: var(--up);
}

.hero-visual img {
  display: block;
  width: 100%;
  height: 100%;
  border-radius: 10px;
  object-fit: cover;
}

.hero-fallback {
  display: grid;
  place-items: center;
  width: 100%;
  height: 100%;
  padding: 8px;
  border-radius: 10px;
  font-size: clamp(17px, 4vw, 26px);
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--ink-2);
  writing-mode: vertical-rl;
  background: linear-gradient(150deg, var(--blue), var(--pink));
  box-shadow: var(--in);
}

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

.eyebrow {
  display: inline-block;
  margin: 0 0 12px;
  padding: 4px 12px;
  border-radius: 999px;
  font-size: 16px;
  letter-spacing: 0.06em;
  color: var(--ink-2);
  background: var(--pink);
  box-shadow: var(--in);
}

.hero h1 {
  margin-bottom: 0.4em;
  font-size: clamp(24px, 6.2vw, 52px);
  font-weight: 700;
  letter-spacing: -0.01em;
}

.hero .lede {
  max-width: 34em;
  margin-left: auto;
  font-size: 17px;
  color: var(--ink-2);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: flex-end;
  margin-top: 18px;
}

.btn {
  display: inline-flex;
  align-items: center;
  min-height: 46px;
  padding: 0 20px;
  border-radius: var(--r);
  font-size: 16px;
  font-weight: 500;
  background: linear-gradient(145deg, #dcebf7, #f4e6ec);
  box-shadow: var(--up);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

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

.btn:active {
  box-shadow: var(--in);
  transform: scale(0.98);
}

.btn-ghost {
  color: var(--ink-2);
  background: transparent;
  box-shadow: var(--in);
}

.shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 18px 56px;
}

main {
  grid-area: main;
  min-width: 0;
}

.content {
  padding-top: 6px;
}

.content > article {
  margin-bottom: 18px;
  padding: 26px 20px;
  border-radius: 4px;
  background: linear-gradient(145deg, #e9f1fa, #f6ebf0);
  box-shadow: var(--up-s);
  scroll-margin-top: 78px;
}

.content h2 {
  font-size: clamp(21px, 3.6vw, 29px);
  letter-spacing: 0.01em;
}

.content h2 span,
.content h3 span {
  display: inline-block;
  padding-bottom: 4px;
  box-shadow: inset 0 -8px 0 rgba(200, 224, 244, 0.9);
}

.content h3 {
  font-size: 19px;
  color: var(--ink);
}

.content p {
  color: var(--ink-2);
}

.content ul,
.content ol {
  margin: 0 0 1em;
  padding-left: 1.3em;
  color: var(--ink-2);
}

.content li {
  margin-bottom: 0.5em;
}

.content li::marker {
  color: #8fa6b8;
}

.content a {
  color: #24506e;
  box-shadow: inset 0 -1px 0 rgba(36, 80, 110, 0.45);
}

.content strong {
  color: var(--ink);
}

.content blockquote {
  margin: 0 0 1em;
  padding: 16px 18px;
  border-radius: 4px;
  color: var(--ink);
  background: var(--pink);
  box-shadow: var(--in);
}

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

.content img {
  display: block;
  height: auto;
  border-radius: 8px;
  box-shadow: var(--up-s);
}

aside {
  grid-area: side;
  min-width: 0;
}

.side-card {
  margin-bottom: 16px;
  padding: 20px 16px;
  border-radius: 4px;
  background: linear-gradient(145deg, #e7f0f9, #f6eaf0);
  box-shadow: var(--up-s);
}

.side-card h2 {
  margin-bottom: 12px;
  font-size: 18px;
}

.side-card h2 span {
  display: inline-block;
  padding-bottom: 4px;
  box-shadow: inset 0 -7px 0 rgba(245, 224, 232, 0.95);
}

.side-card p {
  margin: 0;
  font-size: 16px;
  color: var(--ink-2);
}

.toc {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: t;
}

.toc li {
  counter-increment: t;
}

.toc a {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 42px;
  padding: 0 10px;
  border-radius: 10px;
  font-size: 16px;
  color: var(--ink-2);
  transition: box-shadow 0.15s ease, color 0.15s ease;
}

.toc a::before {
  content: counter(t, decimal-leading-zero);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--ink-3);
}

.toc a:hover {
  color: var(--ink);
  box-shadow: var(--in);
}

footer {
  margin-top: 24px;
  padding: 30px 18px 22px;
  background: linear-gradient(180deg, #e6eef7, #f2e7ee);
  box-shadow: inset 0 10px 22px rgba(255, 255, 255, 0.9), 0 -6px 16px rgba(23, 31, 38, 0.07);
}

.foot-cols {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  max-width: 1180px;
  margin: 0 auto 18px;
}

dl {
  margin: 0;
}

dt {
  margin-bottom: 6px;
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--ink);
}

dd {
  margin: 0 0 0.4em;
  font-size: 16px;
  color: var(--ink-2);
}

.foot-cols dd a {
  display: flex;
  align-items: center;
  min-height: 40px;
  font-size: 16px;
  color: var(--ink-2);
}

.foot-cols dd a:hover {
  color: var(--ink);
  box-shadow: inset 0 -1px 0 rgba(23, 31, 38, 0.35);
}

.copyright {
  max-width: 1180px;
  margin: 0 auto;
  padding-top: 16px;
  font-size: 16px;
  text-align: center;
  color: var(--ink-3);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.9);
}

@media (min-width: 880px) {
  .top {
    padding: 18px 40px;
  }

  .rail {
    padding: 10px 40px;
  }

  .hero {
    grid-template-columns: 46% minmax(0, 1fr);
    gap: 44px;
    padding: 40px 40px 60px;
  }

  .hero-visual {
    aspect-ratio: 4 / 5;
    padding: 12px;
  }

  .shell {
    grid-template-columns: 290px minmax(0, 1fr);
    grid-template-areas: "side main";
    gap: 30px;
    padding: 0 40px 80px;
  }

  .content > article {
    margin-bottom: 22px;
    padding: 34px 32px;
  }

  .side-card:first-child {
    position: sticky;
    top: 74px;
  }

  footer {
    padding: 42px 40px 28px;
  }

  .foot-cols {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 28px;
  }
}

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

  *,
  *::before,
  *::after {
    transition: none !important;
  }

  .hero-num {
    transform: none !important;
  }
}

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