@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;600;700;800&display=swap');

:root {
  --ink: #0E1116;
  --amber: #E8A33D;
  --cream: #F4F1EA;
  --line: rgba(244, 241, 234, .13);
  --dim: rgba(244, 241, 234, .64);
  --panel: rgba(244, 241, 234, .045);
  --r: 18px;
  --pad: clamp(16px, 4vw, 40px);
}

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

html {
  scroll-behavior: smooth;
  background: var(--ink);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', 'Noto Sans SC', sans-serif;
  font-size: 17px;
  line-height: 1.72;
  color: var(--cream);
  background:
    radial-gradient(90% 55% at 88% -8%, rgba(232, 163, 61, .14), transparent 62%),
    radial-gradient(70% 45% at 2% 26%, rgba(232, 163, 61, .07), transparent 60%),
    var(--ink);
  background-attachment: fixed, fixed, scroll;
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; }
menu { list-style: none; }

/* ---------- 顶栏 ---------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 12px;
  padding: 10px var(--pad);
  background: rgba(14, 17, 22, .88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}

.mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  min-height: 44px;
  text-decoration: none;
}

.mk {
  width: 38px;
  height: 38px;
  border-radius: 12px;
  object-fit: cover;
  background: #1a2028;
}

.mk-alt {
  display: grid;
  place-items: center;
  font-weight: 800;
  font-size: 1rem;
  color: #14181e;
  background: linear-gradient(140deg, var(--amber), #b87c23);
}

.navbox { position: relative; min-width: 0; }

.navbox > summary {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: .9rem;
  font-weight: 600;
  color: var(--cream);
  cursor: pointer;
  list-style: none;
  user-select: none;
}

.navbox > summary::-webkit-details-marker { display: none; }

.bars {
  width: 14px;
  height: 10px;
  border-top: 2px solid var(--amber);
  border-bottom: 2px solid var(--amber);
  position: relative;
}

.bars::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  top: 3px;
  height: 2px;
  background: var(--amber);
}

.topmenu {
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 2px;
}

.topmenu a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 42px;
  padding: 0 13px;
  border-radius: 999px;
  font-size: .93rem;
  font-weight: 600;
  color: var(--dim);
  text-decoration: none;
}

.topmenu a:hover,
.topmenu a:focus-visible {
  color: var(--cream);
  background: rgba(244, 241, 234, .08);
}

.dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--amber);
  opacity: .8;
  flex: none;
}

.find input {
  width: 100%;
  max-width: 190px;
  height: 42px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(244, 241, 234, .06);
  color: var(--cream);
  font: inherit;
  font-size: .9rem;
}

.find input::placeholder { color: rgba(244, 241, 234, .45); }
.find input:focus { outline: 2px solid rgba(232, 163, 61, .6); outline-offset: 1px; }

/* ---------- 骨架 ---------- */
.wrap {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 var(--pad);
  display: grid;
  grid-template-columns: 216px minmax(0, 1fr);
  gap: clamp(20px, 4vw, 56px);
  align-items: start;
}

.stage,
.story { grid-column: 2; }

/* ---------- 侧栏 ---------- */
.rail {
  grid-column: 1;
  grid-row: 1 / span 2;
  position: sticky;
  top: 86px;
  padding-top: clamp(40px, 9vh, 92px);
}

.rail-h {
  margin: 0 0 14px;
  font-size: .82rem;
  font-weight: 700;
  letter-spacing: .16em;
  color: var(--dim);
}

.rail-h > span { color: var(--amber); }

.rail-menu {
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.rail-menu a {
  display: flex;
  align-items: center;
  min-height: 40px;
  padding: 0 10px;
  border-left: 1px solid var(--line);
  font-size: .92rem;
  color: var(--dim);
  text-decoration: none;
  transition: color .2s ease, border-color .2s ease, padding-left .2s ease;
}

.rail-menu a:hover {
  color: var(--cream);
  border-left-color: var(--amber);
  padding-left: 14px;
}

/* ---------- 首屏 ---------- */
.stage {
  min-height: 45vh;
  display: flex;
  align-items: flex-end;
  justify-content: flex-end;
  padding-top: clamp(30px, 9vh, 104px);
  text-align: right;
}

.lede { will-change: transform; }
.lede h1 {
  margin: 0 0 16px;
  font-size: clamp(2.1rem, 7.2vw, 4.9rem);
  font-weight: 800;
  line-height: 1.03;
  letter-spacing: -.035em;
  background: linear-gradient(160deg, var(--cream) 55%, #cbbfa7);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.lede .sub {
  margin: 0 0 0 auto;
  max-width: 46ch;
  font-size: .98rem;
  color: var(--dim);
}

/* ---------- 正文 ---------- */
.story { padding-top: clamp(40px, 9vh, 104px); }

.prose {
  display: grid;
  gap: clamp(20px, 3.4vh, 34px);
}

.prose > section {
  padding: clamp(20px, 3.4vw, 40px);
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: var(--panel);
  box-shadow: 0 44px 90px -66px #000, inset 0 1px 0 rgba(244, 241, 234, .05);
  scroll-margin-top: 100px;
}

.prose > section:nth-child(even) { margin-left: clamp(0px, 2vw, 26px); }

.prose h2,
.prose h3 {
  margin: 0 0 .7em;
  letter-spacing: -.02em;
  line-height: 1.16;
  font-weight: 700;
}

.prose h2 { font-size: clamp(1.4rem, 3.2vw, 2.2rem); }
.prose h3 { font-size: clamp(1.15rem, 2.2vw, 1.45rem); }

.prose h2 > span,
.prose h3 > span {
  background: linear-gradient(transparent 66%, rgba(232, 163, 61, .32) 66%);
  padding-bottom: .06em;
}

.prose p { margin: 0 0 1.05em; color: rgba(244, 241, 234, .87); }
.prose p:last-child { margin-bottom: 0; }
.prose ul,
.prose ol { margin: 0 0 1.05em; padding-left: 1.25em; }
.prose li { margin: .35em 0; }
.prose strong { color: var(--cream); }
.prose a { color: var(--amber); text-underline-offset: 3px; }
.prose blockquote {
  margin: 0 0 1em;
  padding: 2px 0 2px 16px;
  border-left: 2px solid var(--amber);
  color: var(--dim);
}
.prose table { width: 100%; border-collapse: collapse; display: block; overflow-x: auto; }
.prose th,
.prose td { padding: 8px 12px; border-bottom: 1px solid var(--line); text-align: left; }

.js .prose > section {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity .75s ease, transform .78s cubic-bezier(.2, .7, .25, 1);
  will-change: opacity, transform;
}

.js .prose > section.in {
  opacity: 1;
  transform: none;
}

/* ---------- 页脚 ---------- */
.foot {
  max-width: 1180px;
  margin: clamp(56px, 12vh, 140px) auto 0;
  padding: clamp(30px, 6vh, 64px) var(--pad) clamp(26px, 5vh, 52px);
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: 1.1fr 1fr 1fr 1.3fr;
  gap: clamp(16px, 3vw, 40px);
}

.f-h {
  margin: 0 0 12px;
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .18em;
  color: var(--dim);
}

.f-h > span { color: var(--cream); }

.f-mark .mk { width: 32px; height: 32px; border-radius: 10px; }

.f-menu { margin: 0; padding: 0; display: grid; gap: 2px; }

.f-menu a {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  font-size: .92rem;
  color: var(--dim);
  text-decoration: none;
}

.f-menu a:hover { color: var(--amber); }

.f-colophon { text-align: center; }
.f-copy { margin: 0; font-weight: 600; }
.f-note { margin: 4px 0 0; font-size: .82rem; color: var(--dim); }

/* ---------- 断点 ---------- */
@media (max-width: 899px) {
  .topbar { grid-template-columns: auto 1fr auto; }

  .navbox > summary { padding: 0 12px; }

  .navbox > .topmenu {
    display: none;
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    margin: 0;
    padding: 8px var(--pad) 18px;
    flex-direction: column;
    background: #12171F;
    border-bottom: 1px solid var(--line);
    box-shadow: 0 30px 50px -30px #000;
  }

  .navbox[open] > .topmenu { display: flex; }
  .topmenu a { min-height: 46px; border-radius: 12px; }

  .find input { max-width: 122px; }

  .wrap { grid-template-columns: minmax(0, 1fr); gap: 0; }

  .stage,
  .story,
  .rail { grid-column: 1; grid-row: auto; }

  .stage { order: 1; min-height: 40vh; padding-top: 42px; }
  .story { order: 3; padding-top: 36px; }
  .rail { order: 2; position: static; padding-top: 26px; }

  .rail-menu {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    padding-bottom: 6px;
    scrollbar-width: thin;
  }

  .rail-menu a {
    border: 1px solid var(--line);
    border-radius: 999px;
    padding: 0 14px;
    min-height: 42px;
    white-space: nowrap;
  }

  .rail-menu a:hover { padding-left: 14px; border-left-color: var(--amber); }

  .prose > section:nth-child(even) { margin-left: 0; }
  .prose > section { scroll-margin-top: 78px; }

  .foot { grid-template-columns: 1fr 1fr; }
  .f-colophon { grid-column: 1 / -1; }
}

@media (max-width: 420px) {
  body { font-size: 16.5px; }
  .find input { max-width: 96px; padding: 0 11px; }
  .topmenu a { font-size: .96rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .js .prose > section {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .lede { transform: none !important; }
  .rail-menu a { transition: none; }
}

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