:root {
  --violet: #56228b;
  --violet-deep: #3b1463;
  --violet-soft: #b98ce8;
  --ochre: #8b4513;
  --ochre-soft: #d9a878;
  --ink: #1f1726;
  --ink-soft: #2c2233;
  --cream: #f6eee3;
  --sand: #e9dac7;
  --sand-deep: #dfcbb3;
  --moss: #3f6b45;
  --line: rgba(31, 23, 38, 0.14);
  --shadow: 0 18px 40px -26px rgba(31, 23, 38, 0.55);
  --font: "Roboto", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.75;
  color: var(--ink);
  background-color: var(--cream);
  background-image:
    radial-gradient(circle at 12% 6%, rgba(86, 34, 139, 0.09), transparent 42%),
    radial-gradient(circle at 88% 22%, rgba(139, 69, 19, 0.11), transparent 40%),
    repeating-linear-gradient(115deg, rgba(31, 23, 38, 0.026) 0 1px, transparent 1px 7px);
  overflow-x: clip;
}

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

a {
  color: inherit;
}

:focus-visible {
  outline: 3px solid var(--ochre);
  outline-offset: 3px;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 90;
  background: rgba(246, 238, 227, 0.93);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.brandrow {
  padding: 14px 20px 2px;
  padding-inline: max(20px, calc((100vw - 1200px) / 2));
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  padding: 4px 2px;
  text-decoration: none;
  color: var(--ink);
  font-weight: 700;
  font-size: 1.2rem;
  letter-spacing: 0.02em;
}

.brandmark {
  font-size: 1.35rem;
  line-height: 1;
}

.brandtext {
  border-bottom: 3px solid var(--ochre-soft);
  padding-bottom: 1px;
}

.menurow {
  padding: 2px 20px 14px;
  padding-inline: max(20px, calc((100vw - 1200px) / 2));
}

.burger {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 46px;
  padding: 11px 20px;
  border: 0;
  border-radius: 999px;
  background: var(--violet);
  color: #fff;
  font-family: inherit;
  font-size: 1rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  cursor: pointer;
  box-shadow: 0 12px 24px -16px rgba(86, 34, 139, 0.9);
  transition: background 0.25s ease, transform 0.25s ease;
}

.burger:hover {
  background: var(--violet-deep);
  transform: translateY(-1px);
}

.burgerbars {
  width: 18px;
  height: 2px;
  background: currentColor;
  box-shadow: 0 -5px 0 currentColor, 0 5px 0 currentColor;
}

body.menu-open {
  overflow: hidden;
}

.rail {
  position: fixed;
  inset: 0;
  z-index: 120;
  padding: 26px 20px 44px;
  color: var(--cream);
  background-color: var(--ink);
  background-image:
    radial-gradient(circle at 82% 12%, rgba(86, 34, 139, 0.55), transparent 46%),
    radial-gradient(circle at 8% 82%, rgba(139, 69, 19, 0.45), transparent 44%);
  transform: translateX(-103%);
  visibility: hidden;
  overflow-y: auto;
  transition: transform 0.42s cubic-bezier(0.2, 0.7, 0.2, 1), visibility 0.42s;
}

body.menu-open .rail {
  transform: none;
  visibility: visible;
}

.railhead {
  position: relative;
  padding-right: 76px;
}

.railhead small {
  display: block;
  font-size: 0.82rem;
  letter-spacing: 0.28em;
  color: var(--ochre-soft);
}

.railtitle {
  margin: 2px 0 0;
  font-size: 1.5rem;
  line-height: 1.3;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.railclose {
  position: absolute;
  top: 0;
  right: 0;
  min-height: 42px;
  padding: 8px 16px;
  border: 1px solid currentColor;
  border-radius: 999px;
  background: transparent;
  color: inherit;
  font-family: inherit;
  font-size: 0.95rem;
  cursor: pointer;
}

.navlist {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
  counter-reset: nav;
}

.navlist li {
  counter-increment: nav;
}

.navlist a {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 48px;
  padding: 12px 16px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.08);
  color: inherit;
  text-decoration: none;
  font-size: 1.12rem;
  font-weight: 500;
  transition: background 0.24s ease, color 0.24s ease, transform 0.24s ease;
}

.navlist a::before {
  content: counter(nav, decimal-leading-zero);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  opacity: 0.55;
}

.navlist a:hover {
  background: var(--violet);
  color: #fff;
  transform: translateX(4px);
}

body.menu-open .navlist li {
  animation: navIn 0.5s cubic-bezier(0.2, 0.7, 0.2, 1) both;
}

body.menu-open .navlist li:nth-child(1) { animation-delay: 0.05s; }
body.menu-open .navlist li:nth-child(2) { animation-delay: 0.1s; }
body.menu-open .navlist li:nth-child(3) { animation-delay: 0.15s; }
body.menu-open .navlist li:nth-child(4) { animation-delay: 0.2s; }
body.menu-open .navlist li:nth-child(5) { animation-delay: 0.25s; }
body.menu-open .navlist li:nth-child(6) { animation-delay: 0.3s; }
body.menu-open .navlist li:nth-child(7) { animation-delay: 0.35s; }

@keyframes navIn {
  from {
    opacity: 0;
    transform: translateX(-16px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.layout {
  display: block;
  padding: 0 18px 56px;
}

.main {
  min-width: 0;
}

.paper {
  min-width: 0;
}

.paper > div {
  scroll-margin-top: 132px;
}

.hero {
  position: relative;
  min-height: 70vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  padding: 36px 0 58px;
  overflow: hidden;
}

.blob {
  position: absolute;
  z-index: 0;
  display: block;
  filter: blur(0.4px);
  opacity: 0.9;
  pointer-events: none;
}

.b1 {
  right: -14vw;
  top: 8vh;
  width: 62vw;
  max-width: 440px;
  height: 62vw;
  max-height: 440px;
  background: radial-gradient(circle at 34% 28%, rgba(86, 34, 139, 0.42), rgba(86, 34, 139, 0.14) 62%, transparent 72%);
  border-radius: 58% 42% 46% 54% / 48% 56% 44% 52%;
  animation: morph 17s ease-in-out infinite alternate, drift 26s linear infinite;
}

.b2 {
  left: -16vw;
  bottom: -4vh;
  width: 54vw;
  max-width: 360px;
  height: 54vw;
  max-height: 360px;
  background: radial-gradient(circle at 60% 40%, rgba(139, 69, 19, 0.38), rgba(139, 69, 19, 0.12) 60%, transparent 72%);
  border-radius: 44% 56% 60% 40% / 56% 44% 56% 44%;
  animation: morph 21s ease-in-out infinite alternate-reverse, drift 32s linear infinite reverse;
}

@keyframes morph {
  0% { border-radius: 58% 42% 46% 54% / 48% 56% 44% 52%; }
  50% { border-radius: 42% 58% 62% 38% / 58% 42% 58% 42%; }
  100% { border-radius: 62% 38% 40% 60% / 40% 62% 38% 62%; }
}

@keyframes drift {
  from { transform: rotate(0deg) translateY(0); }
  to { transform: rotate(360deg) translateY(-10px); }
}

.badge {
  position: relative;
  z-index: 1;
  margin: 0 0 18px;
  padding: 8px 18px;
  border-radius: 999px;
  background: var(--ochre);
  color: #fff8ef;
  font-size: 0.98rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  transform: rotate(-4deg);
  box-shadow: 0 14px 26px -20px rgba(31, 23, 38, 0.9);
}

.hero h1 {
  position: relative;
  z-index: 1;
  margin: 0;
  max-width: 15em;
  font-size: clamp(2.4rem, 9vw, 5rem);
  line-height: 1.12;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--ink);
  text-wrap: balance;
}

.paper > div:not(.hero) {
  padding: 32px 0 26px;
  border-top: 1px solid var(--line);
}

.paper > div:not(.hero):nth-child(even) {
  background: linear-gradient(160deg, rgba(233, 218, 199, 0.62), rgba(233, 218, 199, 0.2));
  border-radius: 26px 18px 30px 16px;
  padding: 28px 20px;
  margin: 10px 0;
  border-top-color: transparent;
}

.paper small {
  display: block;
  font-size: 0.84rem;
  letter-spacing: 0.26em;
  color: var(--ochre);
  margin-bottom: 4px;
}

.paper h2 {
  margin: 0 0 16px;
  font-size: clamp(1.45rem, 3.6vw, 2.05rem);
  line-height: 1.32;
  color: var(--violet-deep);
  letter-spacing: 0.01em;
}

.paper h3 {
  margin: 24px 0 10px;
  font-size: 1.18rem;
  line-height: 1.5;
  color: var(--moss);
}

.paper p {
  margin: 0 0 16px;
  max-width: 68ch;
  font-size: 1.06rem;
  line-height: 1.85;
}

.paper ul,
.paper ol {
  margin: 0 0 20px;
  padding-left: 1.3em;
  max-width: 66ch;
}

.paper li {
  margin-bottom: 9px;
  line-height: 1.8;
}

.paper li::marker {
  color: var(--ochre);
}

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

.paper a:hover {
  color: var(--violet);
}

.paper strong {
  color: var(--violet-deep);
}

.paper blockquote {
  margin: 22px 0;
  padding: 16px 22px;
  background: var(--sand-deep);
  border-left: 6px solid var(--violet);
  border-radius: 18px 14px 22px 12px;
  max-width: 66ch;
}

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

.paper img {
  display: block;
  margin: 22px 0;
  border-radius: 24px 16px 26px 18px;
  box-shadow: var(--shadow);
}

.paper figure {
  margin: 22px 0;
}

.paper figcaption {
  font-size: 0.9rem;
  color: rgba(31, 23, 38, 0.7);
  margin-top: 8px;
}

.paper code {
  font-size: 0.94em;
  background: rgba(86, 34, 139, 0.1);
  padding: 2px 6px;
  border-radius: 6px;
}

.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

.foot {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  padding: 48px 22px 28px;
  padding-inline: max(22px, calc((100vw - 1200px) / 2));
  background: var(--ink);
  color: var(--cream);
  background-image: radial-gradient(circle at 88% 8%, rgba(86, 34, 139, 0.55), transparent 46%);
}

.foot div {
  min-width: 0;
}

.giant {
  margin: 0;
  font-size: clamp(2rem, 8vw, 3.2rem);
  line-height: 1.1;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--violet-soft);
  word-break: break-word;
}

.foot h3 {
  margin: 0 0 10px;
  font-size: 0.92rem;
  letter-spacing: 0.24em;
  font-weight: 500;
  color: var(--ochre-soft);
}

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

.foot li a {
  display: flex;
  align-items: center;
  min-height: 40px;
  padding: 8px 0;
  color: #ece1d3;
  text-decoration: none;
  font-size: 1rem;
  border-bottom: 1px solid rgba(246, 238, 227, 0.14);
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.foot li a:hover {
  color: var(--violet-soft);
  padding-left: 6px;
}

.footlegal {
  display: flex;
  align-items: flex-end;
  font-size: 0.9rem;
  color: #c2b2cc;
}

.footlegal p {
  margin: 0;
}

@media (min-width: 700px) {
  .foot {
    grid-template-columns: 1.3fr 1fr 1fr;
    gap: 32px;
  }

  .footlegal {
    grid-column: 1 / -1;
    padding-top: 6px;
    border-top: 1px solid rgba(246, 238, 227, 0.18);
  }
}

@media (min-width: 980px) {
  .layout {
    display: grid;
    grid-template-columns: 252px minmax(0, 1fr);
    gap: 36px;
    max-width: 1240px;
    margin: 0 auto;
    padding: 0 26px 72px;
  }

  .rail {
    position: sticky;
    top: 150px;
    inset: auto;
    transform: none;
    visibility: visible;
    height: auto;
    max-height: calc(100dvh - 182px);
    overflow: auto;
    padding: 22px 16px;
    color: var(--ink);
    background-color: rgba(233, 218, 199, 0.72);
    background-image: radial-gradient(circle at 80% 6%, rgba(139, 69, 19, 0.18), transparent 60%);
    border-radius: 26px 18px 28px 16px;
    box-shadow: var(--shadow);
    transition: none;
  }

  .railhead small {
    color: var(--ochre);
  }

  .railtitle {
    font-size: 1.25rem;
  }

  .railclose {
    display: none;
  }

  .navlist {
    margin-top: 16px;
    gap: 7px;
  }

  .navlist a {
    min-height: 44px;
    padding: 9px 12px;
    font-size: 0.99rem;
    background: rgba(86, 34, 139, 0.08);
  }

  .navlist a:hover {
    transform: translateX(3px);
  }

  body.menu-open .rail {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    height: 100dvh;
    max-height: none;
    width: auto;
    border-radius: 0;
    padding: 28px 24px 46px;
    overflow-y: auto;
    color: var(--cream);
    background-color: var(--ink);
    background-image:
      radial-gradient(circle at 82% 12%, rgba(86, 34, 139, 0.55), transparent 46%),
      radial-gradient(circle at 8% 82%, rgba(139, 69, 19, 0.45), transparent 44%);
    z-index: 130;
  }

  body.menu-open .railhead small {
    color: var(--ochre-soft);
  }

  body.menu-open .railtitle {
    font-size: 1.5rem;
  }

  body.menu-open .railclose {
    display: inline-block;
  }

  body.menu-open .navlist {
    margin-top: 24px;
    gap: 10px;
  }

  body.menu-open .navlist a {
    min-height: 48px;
    padding: 12px 16px;
    font-size: 1.12rem;
    background: rgba(255, 255, 255, 0.08);
    color: var(--cream);
  }

  .hero {
    padding: 54px 0 72px;
  }

  .foot {
    grid-template-columns: 1.6fr 1fr 1fr 1.2fr;
    padding: 58px 32px 30px;
    padding-inline: max(32px, calc((100vw - 1200px) / 2));
    gap: 34px;
  }

  .footlegal {
    grid-column: auto;
    border-top: 0;
    padding-top: 0;
  }

  .giant {
    font-size: clamp(2.2rem, 4.4vw, 3.4rem);
  }

  .paper p {
    font-size: 1.09rem;
  }
}

@media (min-width: 1240px) {
  .hero h1 {
    max-width: 13em;
  }
}

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

  .blob {
    animation: none;
  }

  .rail,
  .burger,
  .navlist a {
    transition: none;
  }

  body.menu-open .navlist li {
    animation: none;
  }

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

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