:root {
  --ink: #17211d;
  --muted: #65726b;
  --soft: #8c9891;
  --paper: #f6efe3;
  --paper-2: #fbf7ef;
  --surface: rgba(255, 253, 248, 0.84);
  --surface-strong: #fffdf8;
  --teal: #0d4746;
  --teal-2: #1e6b68;
  --sage: #87b6a2;
  --sand: #ead8bd;
  --brass: #c9893f;
  --copper: #9b5834;
  --line: rgba(23, 33, 29, 0.12);
  --line-strong: rgba(23, 33, 29, 0.2);
  --shadow: 0 28px 90px rgba(47, 39, 28, 0.14);
  --shadow-soft: 0 16px 48px rgba(47, 39, 28, 0.1);
  --mono: "Cascadia Code", "Fira Code", "Consolas", monospace;
  --serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "SimSun", serif;
  --sans: "LXGW WenKai Screen", "HarmonyOS Sans SC", "Microsoft YaHei", "PingFang SC", sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 118px; background: var(--paper); }
body {
  margin: 0;
  min-height: 100vh;
  overflow-x: hidden;
  color: var(--ink);
  font-family: var(--serif);
  background:
    radial-gradient(circle at 14% 5%, rgba(201, 137, 63, 0.18), transparent 28rem),
    radial-gradient(circle at 86% 8%, rgba(30, 107, 104, 0.16), transparent 30rem),
    linear-gradient(135deg, #fbf7ef 0%, #f6efe3 46%, #edf3ea 100%);
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(13, 71, 70, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(13, 71, 70, 0.035) 1px, transparent 1px),
    radial-gradient(circle at 15% 82%, rgba(135, 182, 162, 0.18), transparent 26rem);
  background-size: 56px 56px, 56px 56px, auto;
}
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background: linear-gradient(90deg, rgba(246, 239, 227, 0.84), transparent 18%, transparent 82%, rgba(246, 239, 227, 0.78));
}
a { color: inherit; text-decoration: none; }
a:hover { color: var(--teal); }
img { max-width: 100%; }
.read-progress { position: fixed; inset: 0 0 auto; height: 4px; z-index: 70; background: rgba(255, 253, 248, 0.58); }
.read-progress span { display: block; width: 0; height: 100%; background: linear-gradient(90deg, var(--brass), var(--teal-2), var(--sage)); box-shadow: 0 0 20px rgba(13, 71, 70, 0.28); }
.topbar {
  width: min(1180px, calc(100% - 40px));
  margin: 18px auto 0;
  padding: 10px 12px 10px 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  position: relative;
  z-index: 10;
  border: 1px solid rgba(255, 255, 255, 0.72);
  border-radius: 999px;
  background: rgba(255, 253, 248, 0.72);
  box-shadow: 0 18px 48px rgba(47, 39, 28, 0.08);
  backdrop-filter: blur(20px);
}
.topbar.compact { width: min(1320px, calc(100% - 40px)); margin-top: 10px; }
.brand { display: inline-flex; align-items: center; gap: 12px; font-family: var(--sans); font-weight: 900; letter-spacing: 0.01em; color: #18332f; }
.brand img { width: 38px; height: 38px; filter: drop-shadow(0 10px 16px rgba(13, 71, 70, 0.16)); }
.toplinks { display: flex; align-items: center; gap: 5px; color: #50615a; font-family: var(--sans); font-size: 14px; font-weight: 800; }
.toplinks a { padding: 9px 12px; border-radius: 999px; transition: background 0.18s ease, color 0.18s ease; }
.toplinks a:hover { color: var(--teal); background: rgba(13, 71, 70, 0.08); }
.hero { position: relative; min-height: 720px; overflow: hidden; padding-bottom: 76px; }
.hero::before,
.hero::after { content: ""; position: absolute; pointer-events: none; }
.hero::before {
  right: -12vw;
  top: 64px;
  width: min(780px, 58vw);
  aspect-ratio: 1;
  border-radius: 50%;
  background: repeating-radial-gradient(circle, rgba(13, 71, 70, 0.12) 0 1px, transparent 1px 34px);
  mask-image: linear-gradient(90deg, transparent, #000 24%, #000);
  opacity: 0.72;
}
.hero::after {
  left: -14vw;
  bottom: -30vw;
  width: 52vw;
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(201, 137, 63, 0.2), transparent 68%);
}
.hero-shell {
  width: min(1180px, calc(100% - 40px));
  margin: 54px auto 0;
  position: relative;
  z-index: 2;
}
.hero-banner {
  position: relative;
  min-height: clamp(560px, 64vw, 720px);
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.76);
  border-radius: 42px;
  background: linear-gradient(145deg, rgba(255, 253, 248, 0.96), rgba(233, 239, 230, 0.82));
  box-shadow: var(--shadow);
  isolation: isolate;
}
.hero-banner::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background:
    linear-gradient(90deg, rgba(251, 247, 239, 0.98) 0%, rgba(251, 247, 239, 0.94) 30%, rgba(251, 247, 239, 0.72) 64%, rgba(13, 71, 70, 0.08) 100%),
    linear-gradient(180deg, rgba(255, 253, 248, 0.1), rgba(12, 55, 54, 0.18));
}
.hero-banner::after {
  content: "";
  position: absolute;
  inset: 18px;
  z-index: 2;
  pointer-events: none;
  border: 1px solid rgba(255, 255, 255, 0.72);
  border-radius: 30px;
}
.hero-art { position: absolute; inset: 0; background: url("../design/hero/radar-hero-clean.png") center / cover no-repeat; transform: scale(1.02); }
.hero-copy { position: relative; z-index: 3; width: min(980px, 78%); padding: clamp(38px, 6vw, 76px); }
.hero-mark { display: inline-flex; align-items: center; gap: 12px; margin-bottom: 20px; }
.hero-mark img { width: 48px; height: 48px; border-radius: 16px; filter: drop-shadow(0 12px 20px rgba(13, 71, 70, 0.16)); }
.eyebrow { margin: 0; font-family: var(--sans); font-size: 12px; font-weight: 900; letter-spacing: 0.22em; text-transform: uppercase; color: var(--copper); }
h1 { margin: 0 0 24px; max-width: 980px; font-size: clamp(62px, 8.6vw, 118px); line-height: 1.04; letter-spacing: -0.07em; text-wrap: balance; }
.hero-copy p { margin: 0; color: #4f615a; font-size: clamp(24px, 2.3vw, 34px); line-height: 1.45; letter-spacing: -0.03em; }
.hero-actions,
.chapter-actions,
.article-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 11px 17px;
  border: 1px solid rgba(23, 33, 29, 0.14);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.68);
  color: #24413b;
  box-shadow: 0 10px 24px rgba(47, 39, 28, 0.08);
  font-family: var(--sans);
  font-size: 15px;
  font-weight: 900;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}
.btn:hover { transform: translateY(-2px); color: var(--teal); background: #fff; border-color: rgba(13, 71, 70, 0.2); box-shadow: 0 16px 34px rgba(47, 39, 28, 0.14); }
.btn.primary { color: #fffaf1; border-color: transparent; background: linear-gradient(135deg, #0d4746, #1e6b68); }
.btn.primary:hover { color: #fff; background: linear-gradient(135deg, #082f30, #185f5d); }
.btn.ghost { background: rgba(255, 255, 255, 0.34); }
.hero-proof { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; color: #55655e; font-family: var(--sans); }
.hero-proof span { display: inline-flex; align-items: baseline; gap: 6px; padding: 9px 12px; border: 1px solid rgba(13, 71, 70, 0.1); border-radius: 999px; background: rgba(255, 253, 248, 0.72); box-shadow: 0 10px 26px rgba(47, 39, 28, 0.08); backdrop-filter: blur(12px); }
.hero-proof strong { color: var(--teal); font-size: 22px; line-height: 1; }
main { width: min(1180px, calc(100% - 40px)); margin: 0 auto; position: relative; z-index: 4; }
.chapters { margin-top: 12px; }
.section-head { max-width: 780px; margin-bottom: 30px; }
h2 { margin: 8px 0 14px; font-size: clamp(34px, 4.2vw, 56px); line-height: 1.1; letter-spacing: -0.045em; text-wrap: balance; }
.section-head p { color: var(--muted); line-height: 1.8; }
.chapter-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 16px; }
.chapter-card {
  position: relative;
  min-height: 340px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  padding: 26px;
  border: 1px solid rgba(255, 255, 255, 0.74);
  border-radius: 30px;
  background: linear-gradient(180deg, rgba(255, 253, 248, 0.92), rgba(255, 253, 248, 0.64));
  box-shadow: 0 18px 46px rgba(47, 39, 28, 0.08);
  transition: transform 0.24s ease, box-shadow 0.24s ease, border-color 0.24s ease;
}
.chapter-card::before { content: ""; position: absolute; inset: 0 0 auto; height: 4px; background: linear-gradient(90deg, var(--brass), var(--sage), var(--teal-2)); }
.chapter-card::after { content: ""; position: absolute; right: -74px; top: -78px; width: 190px; height: 190px; border-radius: 50%; background: repeating-radial-gradient(circle, rgba(13, 71, 70, 0.1) 0 1px, transparent 1px 18px); opacity: 0.72; pointer-events: none; }
.chapter-card:hover { transform: translateY(-6px); border-color: rgba(13, 71, 70, 0.18); box-shadow: 0 28px 74px rgba(47, 39, 28, 0.14); }
.chapter-kicker { position: relative; z-index: 1; color: var(--copper); font-family: var(--sans); font-weight: 900; }
.chapter-kicker span { display: inline-flex; padding: 6px 10px; border-radius: 999px; background: rgba(201, 137, 63, 0.14); }
.chapter-card h3 { position: relative; z-index: 1; min-height: 66px; margin: 18px 0 12px; font-size: 25px; line-height: 1.28; letter-spacing: -0.03em; }
.chapter-card p { position: relative; z-index: 1; min-height: 88px; margin: 0 0 22px; color: #58665f; font-size: 16.5px; line-height: 1.78; }
.chapter-card .chapter-actions { position: relative; z-index: 1; min-height: 46px; align-content: flex-start; align-items: flex-start; margin-top: auto; }
.chapter-actions .btn { min-height: 40px; padding: 9px 13px; font-size: 14px; }
.author-card { position: relative; display: grid; grid-template-columns: minmax(0, 0.68fr) minmax(320px, 1.32fr); gap: 32px; align-items: center; margin-top: 76px; padding: clamp(24px, 4vw, 42px); border: 1px solid rgba(255, 255, 255, 0.76); border-radius: 36px; background: linear-gradient(145deg, rgba(255, 253, 248, 0.92), rgba(233, 239, 230, 0.74)); box-shadow: var(--shadow-soft); overflow: hidden; }
.author-card::before { content: ""; position: absolute; right: -110px; top: -130px; width: 360px; height: 360px; border-radius: 50%; background: repeating-radial-gradient(circle, rgba(13, 71, 70, 0.1) 0 2px, transparent 2px 24px); pointer-events: none; }
.author-card-copy { position: relative; z-index: 1; margin-bottom: 0; }
.personal-card-frame { position: relative; z-index: 1; margin: 0; }
.personal-card-frame img { display: block; width: 100%; height: auto; margin: 0 auto; border-radius: 26px; background: #fff; box-shadow: 0 26px 72px rgba(47, 39, 28, 0.16); }
.site-footer { width: min(1180px, calc(100% - 40px)); margin: 84px auto 34px; padding-top: 24px; border-top: 1px solid var(--line); color: var(--muted); font-family: var(--sans); line-height: 1.75; }
.article-top { position: sticky; top: 0; z-index: 60; padding-bottom: 10px; border-bottom: 1px solid rgba(23, 33, 29, 0.1); background: rgba(246, 239, 227, 0.76); backdrop-filter: blur(18px); }
.article-layout { width: min(1380px, calc(100% - 32px)); margin: 28px auto 0; display: grid; grid-template-columns: 318px minmax(0, 1fr); gap: 38px; align-items: start; }
.sidebar { position: sticky; top: 92px; max-height: calc(100vh - 112px); overflow: auto; padding: 18px 16px 24px; border: 1px solid rgba(255, 255, 255, 0.76); border-radius: 30px; background: rgba(255, 253, 248, 0.78); box-shadow: 0 18px 46px rgba(47, 39, 28, 0.08); backdrop-filter: blur(14px); font-family: var(--sans); scrollbar-width: thin; }
.back-home { display: inline-flex; margin: 0 0 16px; padding: 9px 12px; border-radius: 999px; color: var(--copper); font-weight: 900; background: rgba(201, 137, 63, 0.12); }
.book-toc { display: grid; gap: 9px; }
.book-toc-group { display: grid; gap: 6px; }
.chapter-toc-link { display: block; padding: 11px 12px; border-radius: 17px; color: #58655f; font-weight: 900; line-height: 1.35; transition: background 0.18s ease, color 0.18s ease, transform 0.18s ease; }
.chapter-toc-link:hover { color: var(--teal); background: rgba(13, 71, 70, 0.07); transform: translateX(2px); }
.chapter-toc-link.active { color: var(--copper); background: linear-gradient(90deg, rgba(201, 137, 63, 0.2), rgba(135, 182, 162, 0.12)); }
.chapter-subtoc { display: grid; gap: 4px; margin: 0 0 10px 16px; padding-left: 14px; border-left: 2px solid rgba(201, 137, 63, 0.28); }
.toc-link { display: block; padding: 9px 11px; border-radius: 14px; color: #57645e; line-height: 1.4; font-size: 15px; }
.toc-link:hover { color: var(--teal); background: rgba(13, 71, 70, 0.06); }
.toc-link.active { color: var(--copper); background: #f0ddc4; font-weight: 900; box-shadow: inset 0 0 0 1px rgba(201, 137, 63, 0.24); }
.toc-section { display: grid; gap: 4px; }
.toc-subitems { display: none; gap: 3px; margin: 2px 0 10px 18px; padding-left: 12px; border-left: 1px solid rgba(201, 137, 63, 0.28); }
.toc-section.open .toc-subitems { display: grid; }
.subtoc-link { display: block; padding: 7px 10px; border-radius: 12px; color: #6a756f; line-height: 1.45; font-size: 14px; }
.subtoc-link:hover { color: var(--teal); background: rgba(13, 71, 70, 0.06); }
.subtoc-link.active { color: var(--copper); background: rgba(201, 137, 63, 0.17); font-weight: 900; }
.article-main { min-width: 0; padding: 0 0 84px; }
.article-meta { display: flex; flex-wrap: wrap; gap: 10px; margin: 0 auto 18px; max-width: 920px; }
.article-meta span { padding: 7px 11px; border-radius: 999px; background: rgba(201, 137, 63, 0.14); color: var(--copper); font-family: var(--sans); font-size: 13px; font-weight: 900; }
.prose { max-width: 920px; margin: 0 auto; padding: clamp(28px, 4.6vw, 64px); overflow: hidden; border: 1px solid rgba(255, 255, 255, 0.78); border-radius: 34px; background: rgba(255, 253, 248, 0.9); box-shadow: var(--shadow); }
.prose h1 { margin: 0 0 38px; font-size: clamp(36px, 5vw, 62px); line-height: 1.12; letter-spacing: -0.045em; text-wrap: balance; }
.section-title { margin: 76px 0 28px; padding-top: 32px; border-top: 1px solid rgba(23, 33, 29, 0.12); font-size: clamp(30px, 3.6vw, 44px); line-height: 1.25; letter-spacing: -0.035em; text-wrap: balance; }
.chapter-section:first-of-type .section-title { margin-top: 10px; padding-top: 0; border-top: 0; }
.prose h3 { margin: 42px 0 14px; font-size: 25px; letter-spacing: -0.02em; }
.prose h4 { margin: 32px 0 12px; font-size: 22px; }
.prose p,
.prose li,
.prose blockquote { font-size: 18px; line-height: 2.04; }
.prose p { margin: 18px 0; }
.prose ul,
.prose ol { margin: 18px 0; padding-left: 1.5em; }
.prose li { margin: 8px 0; }
.prose a { color: var(--copper); border-bottom: 1px solid rgba(155, 88, 52, 0.34); }
.prose code { padding: 0.12em 0.38em; border: 1px solid rgba(13, 71, 70, 0.08); border-radius: 7px; background: rgba(13, 71, 70, 0.08); font-family: var(--mono); font-size: 0.92em; }
.inline-code-link { border-bottom: none !important; }
.prose pre { overflow: auto; padding: 20px; border-radius: 20px; color: #f7ead6; background: linear-gradient(145deg, #102f33, #183b3f); box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.08), 0 18px 38px rgba(13, 71, 70, 0.12); }
.prose pre code { padding: 0; border: 0; color: inherit; background: transparent; }
.prose blockquote { margin: 28px 0; padding: 18px 22px; border-left: 5px solid var(--brass); border-radius: 0 20px 20px 0; color: #4d5c55; background: linear-gradient(90deg, rgba(201, 137, 63, 0.14), rgba(135, 182, 162, 0.08)); }
.math-block,
.table-wrap { overflow-x: auto; }
.prose mjx-container[jax="SVG"][display="true"] { max-width: 100%; overflow-x: auto; overflow-y: hidden; }
table { width: 100%; border-collapse: collapse; overflow: hidden; border-radius: 16px; background: rgba(255, 255, 255, 0.56); font-size: 16px; }
th,
td { padding: 12px 14px; border: 1px solid rgba(23, 33, 29, 0.12); text-align: left; vertical-align: top; }
th { background: rgba(13, 71, 70, 0.08); font-family: var(--sans); }
figure { margin: 34px 0; }
figure img { display: block; max-width: 100%; height: auto; margin: 0 auto; border-radius: 22px; background: #fff; box-shadow: 0 20px 52px rgba(47, 39, 28, 0.16); }
figcaption { margin-top: 12px; color: var(--muted); text-align: center; font-family: var(--sans); font-size: 14px; }
.article-actions { max-width: 920px; margin: 26px auto 0; }
.reveal { animation: lift 0.65s ease both; }
@keyframes lift { from { opacity: 0; transform: translateY(16px); } to { opacity: 1; transform: translateY(0); } }
@media (max-width: 1080px) {
  .hero-copy { width: min(860px, 86%); }
  .chapter-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .article-layout { grid-template-columns: 1fr; }
  .sidebar { position: relative; top: auto; max-height: none; }
  .prose,
  .article-meta,
  .article-actions { max-width: none; }
}
@media (max-width: 820px) {
  .author-card { grid-template-columns: 1fr; }
}
@media (max-width: 720px) {
  html { scroll-padding-top: 92px; }
  .topbar,
  .topbar.compact { width: min(100% - 24px, 760px); align-items: flex-start; flex-direction: column; border-radius: 26px; }
  .toplinks { max-width: 100%; overflow-x: auto; padding-bottom: 2px; }
  .hero { min-height: auto; padding-bottom: 72px; }
  .hero-shell { width: min(100% - 28px, 760px); margin-top: 34px; }
  .hero-banner { min-height: 620px; border-radius: 30px; }
  .hero-banner::before { background: linear-gradient(180deg, rgba(251, 247, 239, 0.96) 0%, rgba(251, 247, 239, 0.9) 46%, rgba(13, 71, 70, 0.08) 100%); }
  .hero-banner::after { inset: 12px; border-radius: 22px; }
  .hero-art { background-position: 58% center; }
  .hero-copy { width: 100%; padding: 30px 26px; }
  .hero-mark img { width: 42px; height: 42px; border-radius: 14px; }
  .hero-proof { margin-top: 16px; }
  h1 { font-size: clamp(50px, 14vw, 78px); line-height: 1.06; letter-spacing: -0.055em; }
  main { width: min(100% - 28px, 760px); }
  .chapter-grid { grid-template-columns: 1fr; }
  .chapter-card { min-height: auto; padding: 22px; }
  .chapter-card h3,
  .chapter-card p { min-height: auto; }
  .author-card { gap: 20px; }
  .article-layout { width: min(100% - 20px, 760px); gap: 22px; }
  .prose { padding: 24px; border-radius: 24px; }
  .prose p,
  .prose li,
  .prose blockquote { font-size: 17px; line-height: 1.92; }
  .chapter-card h3 { font-size: 26px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; scroll-behavior: auto !important; transition: none !important; }
}