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

:root {
  --bg: #171f26;
  --bg-hi: #1f2b35;
  --bg-lo: #131a20;
  --panel: #1c262f;
  --blue: #c8e0f4;
  --pink: #f5e0e8;
  --ink: #e3edf5;
  --soft: #b9cbd8;
  --muted: #93a6b4;
  --r: 18px;
  --r-sm: 14px;
  --head-h: 124px;
  --lift: -6px -6px 16px rgba(255, 255, 255, 0.05), 7px 7px 20px rgba(0, 0, 0, 0.58);
  --lift-sm: -3px -3px 9px rgba(255, 255, 255, 0.05), 4px 4px 11px rgba(0, 0, 0, 0.5);
  --press: inset -3px -3px 9px rgba(255, 255, 255, 0.05), inset 4px 4px 9px rgba(0, 0, 0, 0.6);
}

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

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

body {
  margin: 0;
  padding-top: var(--head-h);
  background: radial-gradient(1200px 600px at 90% -10%, rgba(200, 224, 244, 0.07), transparent 60%),
              radial-gradient(900px 500px at -10% 30%, rgba(245, 224, 232, 0.06), transparent 60%),
              var(--bg);
  color: var(--ink);
  font-family: "Be Vietnam Pro", "Noto Sans", system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 17px;
  line-height: 1.8;
  font-weight: 400;
  overflow-x: hidden;
}

body.locked { overflow: hidden; }

img { max-width: 100%; }

.skip {
  position: absolute;
  left: -999px;
  top: 0;
  z-index: 80;
  padding: 12px 18px;
  background: var(--pink);
  color: var(--bg);
  border-radius: 0 0 var(--r-sm) 0;
  text-decoration: none;
}
.skip:focus { left: 0; }

/* ---------- 页头：品牌独占一行 + 菜单行 ---------- */
.top {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(23, 31, 38, 0.9);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: 0 10px 26px rgba(0, 0, 0, 0.45);
}

.top-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 8px 18px 14px;
}

.brand-row { display: flex; align-items: center; }

.brand {
  display: inline-flex;
  align-items: center;
  min-height: 48px;
  padding: 4px 2px;
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--blue);
  text-decoration: none;
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.06);
}
.brand:hover { color: var(--pink); }

.menu-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 6px;
}

.burger {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 46px;
  padding: 10px 18px;
  border: 0;
  border-radius: var(--r-sm);
  background: linear-gradient(145deg, var(--bg-hi), var(--bg-lo));
  color: var(--ink);
  font: inherit;
  font-size: 16px;
  box-shadow: var(--lift-sm);
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.burger:hover { color: var(--pink); }
.burger:active { transform: scale(0.97); box-shadow: var(--press); }

.burger-lines { display: inline-flex; flex-direction: column; gap: 4px; }
.burger-lines i {
  display: block;
  width: 17px;
  height: 2px;
  border-radius: 2px;
  background: var(--blue);
}

.search {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 46px;
  padding: 4px 8px 4px 14px;
  border-radius: var(--r-sm);
  background: var(--bg-lo);
  box-shadow: var(--press);
}
.search input {
  flex: 1;
  min-width: 0;
  min-height: 36px;
  border: 0;
  background: transparent;
  color: var(--ink);
  font: inherit;
  font-size: 16px;
  outline: none;
}
.search input::placeholder { color: var(--muted); }

.search-go {
  min-height: 38px;
  min-width: 44px;
  padding: 0 12px;
  border: 0;
  border-radius: 11px;
  background: linear-gradient(145deg, #26343f, #182128);
  color: var(--blue);
  font: inherit;
  font-size: 16px;
  box-shadow: var(--lift-sm);
  cursor: pointer;
}
.search-go:active { transform: scale(0.96); box-shadow: var(--press); }

/* ---------- 全屏遮罩菜单 ---------- */
.drawer {
  position: fixed;
  inset: 0;
  z-index: 60;
  display: flex;
  flex-direction: column;
  gap: 18px;
  padding: 16px 18px 34px;
  overflow-y: auto;
  background: linear-gradient(160deg, #1c2731, #131a21 70%);
  transform: translateX(-102%);
  visibility: hidden;
  transition: transform 0.3s cubic-bezier(0.22, 0.7, 0.3, 1), visibility 0.3s;
}
.drawer.open { transform: none; visibility: visible; }

.drawer-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 14px;
  border-bottom: 1px solid rgba(200, 224, 244, 0.09);
}

.drawer-brand {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--blue);
}

.drawer-close {
  min-height: 44px;
  padding: 8px 18px;
  border: 0;
  border-radius: var(--r-sm);
  background: linear-gradient(145deg, var(--bg-hi), var(--bg-lo));
  color: var(--pink);
  font: inherit;
  font-size: 16px;
  box-shadow: var(--lift-sm);
  cursor: pointer;
}
.drawer-close:active { transform: scale(0.97); box-shadow: var(--press); }

.drawer-nav { flex: 1; }
.drawer-nav ul {
  list-style: none;
  margin: 6px 0 0;
  padding: 0;
}
.drawer-nav li { margin-bottom: 10px; }
.drawer-nav li.hide { display: none; }
.drawer-nav a {
  display: flex;
  align-items: center;
  min-height: 54px;
  padding: 12px 20px;
  border-radius: var(--r);
  background: linear-gradient(145deg, #1e2933, #151d24);
  box-shadow: var(--lift-sm);
  color: var(--ink);
  font-size: 20px;
  font-weight: 500;
  text-decoration: none;
  transition: transform 0.15s ease, box-shadow 0.15s ease, color 0.15s ease;
}
.drawer-nav a:hover { color: var(--pink); }
.drawer-nav a:active { transform: scale(0.985); box-shadow: var(--press); }

/* ---------- Hero ---------- */
.main { display: block; }

.hero {
  position: relative;
  max-width: 1120px;
  margin: 0 auto;
  min-height: 45vh;
  padding: 26px 22px 42px;
  display: flex;
  align-items: flex-end;
  justify-content: flex-end;
  overflow: hidden;
  border-radius: 0 0 46px 46px;
  background: linear-gradient(145deg, #1e2a34, #141b22);
  box-shadow: var(--lift);
}

.hero-media { position: absolute; inset: 0; }
.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.55;
}
.hero-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(100deg, rgba(23, 31, 38, 0.3), rgba(23, 31, 38, 0.9));
}

.hero-copy {
  position: relative;
  z-index: 1;
  max-width: 620px;
  text-align: right;
}

.badge {
  display: inline-block;
  margin: 0 0 12px;
  padding: 7px 16px;
  border-radius: 999px;
  background: linear-gradient(145deg, #26333e, #182028);
  color: var(--pink);
  font-size: 16px;
  letter-spacing: 0.06em;
  box-shadow: var(--lift-sm);
}

.hero h1 {
  margin: 0;
  font-size: clamp(26px, 4.6vw, 42px);
  line-height: 1.35;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--blue);
  text-shadow: 0 2px 18px rgba(0, 0, 0, 0.55);
}

/* ---------- 正文骨架 ---------- */
.wrap {
  max-width: 1120px;
  margin: 0 auto;
  padding: 38px 18px 10px;
}

.content {
  display: grid;
  grid-template-columns: 244px minmax(0, 1fr);
  gap: 30px;
  align-items: start;
}

.side {
  position: sticky;
  top: calc(var(--head-h) + 18px);
  padding: 18px 14px 16px;
  border-radius: var(--r);
  background: linear-gradient(145deg, #1d2832, #151d23);
  box-shadow: var(--lift);
}

.side-title {
  margin: 0 0 12px;
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--muted);
}
.side-title span { display: inline-block; }

.side-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
}
.side-nav li { margin-bottom: 8px; }
.side-nav a {
  display: flex;
  align-items: center;
  min-height: 42px;
  padding: 9px 14px;
  border-radius: 13px;
  background: linear-gradient(145deg, #202c36, #172028);
  box-shadow: var(--lift-sm);
  color: var(--soft);
  font-size: 16px;
  line-height: 1.5;
  text-decoration: none;
  transition: color 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease;
}
.side-nav a:hover { color: var(--pink); transform: translateX(2px); }
.side-nav a:active { box-shadow: var(--press); }

/* ---------- 正文 ---------- */
.prose { min-width: 0; }

.prose section {
  scroll-margin-top: calc(var(--head-h) + 18px);
  padding: 4px 0 6px;
}

.prose section + section {
  margin-top: 46px;
  padding-top: 40px;
  border-top: 1px solid rgba(200, 224, 244, 0.09);
}

.prose h2,
.prose h3 {
  color: var(--blue);
  line-height: 1.45;
  letter-spacing: 0.01em;
}
.prose h2 { font-size: clamp(21px, 2.6vw, 27px); margin: 0 0 16px; }
.prose h3 { font-size: 19px; margin: 26px 0 10px; }

.prose h2 > span,
.prose h3 > span {
  position: relative;
  display: inline-block;
  padding-left: 18px;
}
.prose h2 > span::before,
.prose h3 > span::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.42em;
  width: 7px;
  height: 0.72em;
  border-radius: 999px;
  background: linear-gradient(180deg, var(--pink), var(--blue));
  box-shadow: 0 0 10px rgba(245, 224, 232, 0.35);
}

.prose p { margin: 0 0 18px; color: #d2e0eb; }
.prose strong { color: var(--pink); font-weight: 600; }
.prose a { color: var(--pink); text-decoration: underline; text-underline-offset: 3px; }
.prose a:hover { color: var(--blue); }

.prose ul,
.prose ol { margin: 0 0 20px; padding-left: 1.3em; color: #d2e0eb; }
.prose li { margin-bottom: 8px; }

.prose blockquote {
  margin: 24px 0;
  padding: 18px 22px;
  border-radius: var(--r);
  background: var(--bg-lo);
  box-shadow: var(--press);
  color: var(--soft);
}
.prose blockquote p:last-child { margin-bottom: 0; }

.prose img {
  height: auto;
  border-radius: var(--r-sm);
  box-shadow: var(--lift);
}

.prose figure { margin: 24px 0; }

.prose table {
  width: 100%;
  margin: 22px 0;
  border-collapse: separate;
  border-spacing: 0 6px;
  font-size: 16px;
}
.prose th,
.prose td {
  padding: 10px 14px;
  text-align: left;
  background: var(--panel);
  border-radius: 10px;
}
.prose th { color: var(--blue); }

/* ---------- 页脚 ---------- */
footer {
  max-width: 1120px;
  margin: 62px auto 0;
  padding: 26px 18px 44px;
  text-align: center;
  color: var(--muted);
  font-size: 16px;
  border-top: 1px solid rgba(200, 224, 244, 0.08);
}
footer p { margin: 0 0 8px; }
footer small { display: inline-block; font-size: 16px; }
footer a {
  display: inline-flex;
  align-items: center;
  min-height: 42px;
  padding: 0 16px;
  border-radius: 12px;
  background: linear-gradient(145deg, #1d2832, #151d23);
  box-shadow: var(--lift-sm);
  color: var(--blue);
  text-decoration: none;
}
footer a:hover { color: var(--pink); }
footer a:active { box-shadow: var(--press); }

/* ---------- 窄屏 ---------- */
@media (max-width: 780px) {
  :root { --head-h: 118px; }
  body { font-size: 16px; }
  .top-inner { padding: 6px 14px 12px; }
  .brand { font-size: 19px; min-height: 44px; }
  .hero {
    min-height: 42vh;
    padding: 20px 16px 34px;
    border-radius: 0 0 30px 30px;
    margin: 0 10px;
  }
  .wrap { padding: 26px 14px 6px; }
  .content { grid-template-columns: minmax(0, 1fr); gap: 22px; }
  .side { position: static; padding: 14px; }
  .side-nav ul { display: flex; flex-wrap: wrap; gap: 8px; }
  .side-nav li { margin: 0; }
  .side-nav a { min-height: 42px; }
  .prose section + section { margin-top: 34px; padding-top: 28px; }
  .drawer-nav a { font-size: 18px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}

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