:root {
  --ink: #eaf3ff;
  --muted: #94a6bf;
  --muted-2: #697a91;
  --line: rgba(152, 183, 222, .15);
  --line-strong: rgba(152, 183, 222, .28);
  --surface: rgba(8, 20, 37, .78);
  --surface-strong: rgba(12, 29, 51, .92);
  --surface-light: rgba(20, 42, 70, .72);
  --page: #050d18;
  --cyan: #8ad8ff;
  --cyan-strong: #4db6ec;
  --violet: #b9a7ff;
  --violet-strong: #8f7bdf;
  --blue: #80a9ff;
  --danger: #ff8694;
  --success: #84ddb5;
  --amber: #f6c86f;
  --shadow: 0 24px 80px rgba(0, 0, 0, .3);
  --radius-xl: 28px;
  --radius-lg: 20px;
  --radius-md: 14px;
  --radius-sm: 10px;
  --max: 1220px;
  color-scheme: dark;
}

* { box-sizing: border-box; }

html { min-height: 100%; scroll-behavior: smooth; }

body {
  min-height: 100vh;
  margin: 0;
  overflow-x: hidden;
  color: var(--ink);
  background:
    radial-gradient(circle at 16% 2%, rgba(59, 117, 178, .20), transparent 29rem),
    radial-gradient(circle at 95% 28%, rgba(104, 76, 179, .16), transparent 31rem),
    var(--page);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
  line-height: 1.68;
}

button, input, textarea, select { font: inherit; }
button { color: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; }

#starfield {
  position: fixed;
  inset: 0;
  z-index: -4;
  width: 100%;
  height: 100%;
  pointer-events: none;
  opacity: .92;
}

.background-noise {
  position: fixed;
  inset: 0;
  z-index: -3;
  pointer-events: none;
  opacity: .18;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 160 160' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.95' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.45'/%3E%3C/svg%3E");
  mix-blend-mode: soft-light;
}

.site-shell { min-height: 100vh; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 26px;
  max-width: var(--max);
  margin: 0 auto;
  padding: 16px 24px;
  border: 1px solid transparent;
  transition: background .25s ease, border-color .25s ease, backdrop-filter .25s ease;
}

.site-header.is-scrolled {
  margin-top: 8px;
  border-color: var(--line);
  border-radius: 18px;
  background: rgba(5, 14, 27, .76);
  backdrop-filter: blur(18px);
}

.brand { display: inline-flex; align-items: center; gap: 10px; min-width: 0; }
.brand-mark { width: 35px; height: 35px; flex: 0 0 auto; }
.brand-text { display: grid; line-height: 1.15; white-space: nowrap; }
.brand-text strong { font-family: Georgia, "Noto Serif SC", serif; font-size: 1.08rem; letter-spacing: .07em; }
.brand-text small { color: var(--muted); margin-top: 3px; font-size: .67rem; letter-spacing: .12em; text-transform: uppercase; }

.desktop-nav { display: flex; align-items: center; gap: 4px; }
.desktop-nav a, .admin-link {
  position: relative;
  padding: 8px 10px;
  border-radius: 9px;
  color: var(--muted);
  font-size: .91rem;
  transition: color .2s ease, background .2s ease;
}
.desktop-nav a:hover, .desktop-nav a.is-active, .admin-link:hover { color: var(--ink); background: rgba(138, 216, 255, .08); }
.desktop-nav a.is-active::after {
  position: absolute;
  right: 10px;
  bottom: 3px;
  left: 10px;
  height: 1px;
  content: "";
  background: linear-gradient(90deg, transparent, var(--cyan), transparent);
}

.header-actions { justify-self: end; display: flex; align-items: center; gap: 5px; }
.icon-button, .menu-button {
  display: inline-grid;
  width: 36px;
  height: 36px;
  place-items: center;
  padding: 0;
  border: 1px solid transparent;
  border-radius: 10px;
  color: var(--muted);
  background: transparent;
  cursor: pointer;
  transition: .2s ease;
}
.icon-button:hover, .menu-button:hover { border-color: var(--line); color: var(--ink); background: rgba(138, 216, 255, .08); }
.icon-button span { font-size: 1.5rem; line-height: 1; }
.menu-button { display: none; gap: 4px; align-content: center; }
.menu-button span { width: 16px; height: 1px; background: currentColor; transition: .2s; }

.mobile-menu {
  position: fixed;
  top: 72px;
  right: 16px;
  z-index: 35;
  display: none;
  width: min(250px, calc(100vw - 32px));
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(7, 18, 33, .95);
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
}
.mobile-menu.is-open { display: grid; }
.mobile-menu a { padding: 11px 12px; color: var(--muted); border-radius: 8px; }
.mobile-menu a:hover { color: var(--ink); background: rgba(138, 216, 255, .08); }

main { max-width: var(--max); min-height: calc(100vh - 210px); margin: 0 auto; padding: 20px 24px 64px; }

.page { animation: page-in .34s ease both; }
@keyframes page-in { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }

.hero { position: relative; padding: 60px 0 28px; overflow: hidden; }
.hero::before {
  position: absolute;
  top: -170px;
  right: -110px;
  width: 520px;
  height: 520px;
  border: 1px solid rgba(138,216,255,.15);
  border-radius: 50%;
  content: "";
  box-shadow: 0 0 0 62px rgba(138,216,255,.025), 0 0 0 123px rgba(185,167,255,.02);
  pointer-events: none;
}
.hero-grid { position: relative; display: grid; grid-template-columns: minmax(0, 1.35fr) minmax(280px, .65fr); gap: 30px; align-items: end; }
.eyebrow { margin: 0 0 10px; color: var(--cyan); font-size: .72rem; font-weight: 700; letter-spacing: .18em; text-transform: uppercase; }
.hero h1, .page-heading h1 { max-width: 880px; margin: 0; font-family: Georgia, "Noto Serif SC", serif; font-weight: 500; letter-spacing: .025em; line-height: 1.18; }
.hero h1 { font-size: clamp(2.5rem, 6vw, 5.35rem); }
.hero h1 em { color: var(--cyan); font-style: normal; text-shadow: 0 0 38px rgba(138,216,255,.25); }
.hero-description { max-width: 720px; margin: 22px 0 0; color: var(--muted); font-size: 1.04rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }

.orbit-card {
  position: relative;
  min-height: 260px;
  padding: 20px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background: linear-gradient(135deg, rgba(18, 39, 66, .82), rgba(8, 19, 36, .75));
  box-shadow: var(--shadow);
}
.orbit-core { position: absolute; top: 50%; left: 50%; display: grid; width: 60px; height: 60px; place-items: center; border-radius: 50%; transform: translate(-50%, -50%); color: #06111e; background: var(--cyan); box-shadow: 0 0 42px rgba(138,216,255,.68); font-family: Georgia, serif; font-size: 1.5rem; }
.orbit { position: absolute; top: 50%; left: 50%; border: 1px solid rgba(138,216,255,.25); border-radius: 50%; transform: translate(-50%, -50%); }
.orbit.a { width: 138px; height: 86px; transform: translate(-50%, -50%) rotate(-25deg); animation: orbit-turn 15s linear infinite; }
.orbit.b { width: 210px; height: 142px; border-color: rgba(185,167,255,.22); transform: translate(-50%, -50%) rotate(42deg); animation: orbit-turn 20s linear infinite reverse; }
.orbit.c { width: 305px; height: 189px; border-color: rgba(128,169,255,.14); transform: translate(-50%, -50%) rotate(10deg); animation: orbit-turn 25s linear infinite; }
.orbit i { position: absolute; width: 8px; height: 8px; border-radius: 50%; background: var(--violet); box-shadow: 0 0 14px currentColor; }
.orbit.a i { top: 0; left: 48%; color: var(--cyan); background: currentColor; }
.orbit.b i { right: 13%; bottom: 5%; color: var(--violet); background: currentColor; }
.orbit.c i { top: 13%; left: 7%; color: var(--blue); background: currentColor; }
@keyframes orbit-turn { to { transform: translate(-50%, -50%) rotate(335deg); } }
.orbit-caption { position: absolute; right: 20px; bottom: 18px; left: 20px; display: flex; align-items: end; justify-content: space-between; gap: 12px; color: var(--muted); font-size: .82rem; }
.orbit-caption strong { color: var(--ink); font-size: .93rem; }

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 40px;
  padding: 10px 16px;
  border: 1px solid transparent;
  border-radius: 10px;
  color: #07121f;
  background: var(--cyan);
  box-shadow: 0 8px 26px rgba(79, 182, 236, .16);
  cursor: pointer;
  font-weight: 700;
  font-size: .89rem;
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}
.button:hover { transform: translateY(-2px); box-shadow: 0 12px 30px rgba(79, 182, 236, .27); }
.button.secondary { color: var(--ink); background: rgba(138,216,255,.07); border-color: var(--line-strong); box-shadow: none; }
.button.ghost { color: var(--muted); background: transparent; box-shadow: none; }
.button.ghost:hover { color: var(--ink); background: rgba(138,216,255,.06); }
.button.danger { color: #fff; background: #9e3948; box-shadow: none; }
.button.small { min-height: 33px; padding: 6px 10px; font-size: .79rem; }

.search-box {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 12px;
  color: var(--muted);
  background: rgba(6, 17, 32, .68);
  transition: .2s ease;
}
.search-box:focus-within { border-color: rgba(138,216,255,.6); box-shadow: 0 0 0 3px rgba(138,216,255,.09); }
.search-box input { width: 100%; min-width: 0; border: 0; outline: 0; color: var(--ink); background: transparent; }
.search-box input::placeholder { color: var(--muted-2); }
kbd { padding: 2px 5px; border: 1px solid var(--line); border-radius: 4px; color: var(--muted-2); font-size: .68rem; font-family: inherit; }

.stats-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; margin: 32px 0 54px; }
.stat-card { padding: 18px; border: 1px solid var(--line); border-radius: var(--radius-md); background: rgba(9, 22, 40, .58); }
.stat-card strong { display: block; color: var(--cyan); font-family: Georgia, serif; font-size: 1.7rem; font-weight: 500; }
.stat-card span { color: var(--muted); font-size: .82rem; }

.section { margin-top: 54px; }
.section-head { display: flex; align-items: end; justify-content: space-between; gap: 20px; margin-bottom: 18px; }
.section-head h2 { margin: 0; font-family: Georgia, "Noto Serif SC", serif; font-size: clamp(1.42rem, 3vw, 2rem); font-weight: 500; letter-spacing: .035em; }
.section-head p { max-width: 560px; margin: 7px 0 0; color: var(--muted); font-size: .91rem; }
.text-link { color: var(--cyan); font-size: .9rem; white-space: nowrap; }
.text-link:hover { text-decoration: underline; }

.module-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
.module-card, .article-card, .resource-card, .knowledge-card, .typing-card, .panel {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: linear-gradient(145deg, rgba(13, 30, 52, .72), rgba(6, 17, 32, .7));
  box-shadow: 0 16px 45px rgba(0, 0, 0, .12);
}
.module-card { position: relative; min-height: 202px; padding: 20px; overflow: hidden; transition: transform .25s ease, border-color .25s ease, background .25s ease; }
.module-card:hover { transform: translateY(-4px); border-color: rgba(138,216,255,.42); background: linear-gradient(145deg, rgba(18, 42, 70, .84), rgba(7, 19, 34, .78)); }
.module-card .module-icon { display: grid; width: 42px; height: 42px; place-items: center; border: 1px solid rgba(138,216,255,.25); border-radius: 13px; color: var(--cyan); background: rgba(138,216,255,.07); font-size: 1.25rem; }
.module-card h3 { margin: 19px 0 6px; font-size: 1.08rem; }
.module-card p { margin: 0; color: var(--muted); font-size: .87rem; }
.module-card .arrow { position: absolute; right: 18px; bottom: 16px; color: var(--cyan); }

.content-grid { display: grid; grid-template-columns: minmax(0, 1fr) 310px; gap: 20px; align-items: start; }
.article-list { display: grid; gap: 14px; }
.article-card { position: relative; display: grid; grid-template-columns: 118px 1fr; gap: 17px; padding: 14px; transition: transform .25s ease, border-color .25s ease; }
.article-card:hover { transform: translateY(-3px); border-color: rgba(138,216,255,.40); }
.article-cover { position: relative; min-height: 124px; overflow: hidden; border-radius: 13px; background: linear-gradient(135deg, #0d2944, #19244d); }
.article-cover::before, .article-cover::after { position: absolute; content: ""; border-radius: 50%; }
.article-cover.java::before { width: 120px; height: 120px; top: -36px; left: -20px; background: radial-gradient(circle at 40% 40%, rgba(138,216,255,.95) 0 4%, rgba(138,216,255,.18) 6% 30%, transparent 31%); box-shadow: 55px 55px 0 -18px rgba(185,167,255,.58); }
.article-cover.algorithm::before { width: 93px; height: 93px; top: 18px; left: 14px; border: 1px solid rgba(138,216,255,.6); box-shadow: 72px -32px 0 -23px rgba(185,167,255,.75), 84px 65px 0 -27px rgba(128,169,255,.65); }
.article-cover.agent::before { width: 130px; height: 130px; top: -42px; right: -44px; border: 1px solid rgba(185,167,255,.63); box-shadow: -60px 70px 0 -29px rgba(138,216,255,.72); }
.article-cover.english::before { width: 78px; height: 78px; top: 20px; left: 20px; border: 1px dashed rgba(138,216,255,.6); }
.article-cover.english::after { width: 34px; height: 34px; right: 20px; bottom: 20px; background: rgba(185,167,255,.45); }
.article-cover.web::before { width: 170px; height: 70px; top: 29px; left: -22px; border: 1px solid rgba(138,216,255,.65); border-radius: 50%; transform: rotate(-24deg); }
.article-cover .cover-symbol { position: absolute; right: 11px; bottom: 8px; color: rgba(234,243,255,.72); font-family: Georgia, serif; font-size: 1.55rem; }
.article-card-body { min-width: 0; }
.article-card-meta { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; color: var(--muted-2); font-size: .73rem; }
.article-card h3 { margin: 7px 0 7px; line-height: 1.4; font-size: 1.08rem; }
.article-card h3 a:hover { color: var(--cyan); }
.article-card p { margin: 0; color: var(--muted); font-size: .86rem; display: -webkit-box; overflow: hidden; -webkit-box-orient: vertical; -webkit-line-clamp: 2; }
.tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 11px; }
.tag { padding: 3px 7px; border: 1px solid rgba(138,216,255,.12); border-radius: 99px; color: #b9c9dd; background: rgba(138,216,255,.04); font-size: .69rem; }

.side-stack { display: grid; gap: 14px; }
.panel { padding: 18px; }
.panel h3 { margin: 0 0 13px; font-family: Georgia, "Noto Serif SC", serif; font-weight: 500; font-size: 1.12rem; }
.panel p { color: var(--muted); font-size: .85rem; }
.roadmap { display: grid; gap: 13px; }
.roadmap-item { position: relative; padding-left: 20px; }
.roadmap-item::before { position: absolute; top: 8px; left: 0; width: 7px; height: 7px; border: 2px solid var(--cyan); border-radius: 50%; content: ""; box-shadow: 0 0 12px rgba(138,216,255,.45); }
.roadmap-item:not(:last-child)::after { position: absolute; top: 18px; bottom: -13px; left: 4px; width: 1px; content: ""; background: var(--line); }
.roadmap-item strong { display: block; font-size: .86rem; }
.roadmap-item span { color: var(--muted); font-size: .76rem; }
.quote-panel { border-color: rgba(185,167,255,.24); background: linear-gradient(145deg, rgba(39, 31, 72, .54), rgba(8, 20, 38, .78)); }
.quote-panel blockquote { margin: 0; font-family: Georgia, "Noto Serif SC", serif; color: #e2ddff; line-height: 1.8; font-size: 1rem; }
.quote-panel cite { display: block; margin-top: 13px; color: var(--muted); font-size: .75rem; font-style: normal; }

.page-heading { margin: 34px 0 26px; }
.page-heading h1 { font-size: clamp(2rem, 4.3vw, 3.5rem); }
.page-heading p { max-width: 690px; margin: 14px 0 0; color: var(--muted); }
.breadcrumb { display: flex; flex-wrap: wrap; gap: 7px; align-items: center; margin-bottom: 15px; color: var(--muted); font-size: .82rem; }
.breadcrumb a:hover { color: var(--cyan); }

.toolbar { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-bottom: 18px; }
.toolbar .search-box { flex: 1 1 260px; }
.filter-chips { display: flex; flex-wrap: wrap; gap: 7px; }
.chip { padding: 7px 10px; border: 1px solid var(--line); border-radius: 99px; color: var(--muted); background: rgba(9,22,40,.5); cursor: pointer; font-size: .77rem; transition: .2s; }
.chip:hover, .chip.is-active { border-color: rgba(138,216,255,.45); color: var(--ink); background: rgba(138,216,255,.1); }

.knowledge-layout { display: grid; grid-template-columns: minmax(0, 1.45fr) minmax(310px, .55fr); gap: 18px; align-items: start; }
.knowledge-map { position: relative; min-height: 600px; overflow: hidden; padding: 28px; border: 1px solid var(--line); border-radius: var(--radius-xl); background: radial-gradient(circle at center, rgba(138,216,255,.13), transparent 20%), linear-gradient(145deg, rgba(13,30,52,.78), rgba(6,17,32,.75)); }
.knowledge-map::before { position: absolute; inset: 12%; border: 1px solid rgba(138,216,255,.12); border-radius: 50%; content: ""; box-shadow: 0 0 0 76px rgba(138,216,255,.024), 0 0 0 150px rgba(185,167,255,.015); }
.map-core { position: absolute; top: 50%; left: 50%; z-index: 2; display: grid; width: 118px; height: 118px; place-items: center; border: 1px solid rgba(138,216,255,.65); border-radius: 50%; transform: translate(-50%, -50%); color: var(--cyan); background: rgba(7,19,34,.88); box-shadow: 0 0 44px rgba(138,216,255,.2); text-align: center; font-family: Georgia, "Noto Serif SC", serif; line-height: 1.2; }
.map-core small { display: block; margin-top: 5px; color: var(--muted); font-family: inherit; font-size: .61rem; letter-spacing: .1em; text-transform: uppercase; }
.map-node { position: absolute; z-index: 3; display: grid; width: 126px; min-height: 68px; place-items: center; padding: 9px; border: 1px solid var(--line); border-radius: 14px; color: var(--ink); background: rgba(9,22,40,.82); box-shadow: 0 10px 30px rgba(0,0,0,.18); text-align: center; font-size: .79rem; transition: .2s; }
.map-node:hover { border-color: rgba(138,216,255,.66); color: var(--cyan); transform: scale(1.04); }
.map-node small { display: block; color: var(--muted); font-size: .64rem; }
.map-node.node-1 { top: 11%; left: 8%; }
.map-node.node-2 { top: 9%; left: 42%; }
.map-node.node-3 { top: 18%; right: 7%; }
.map-node.node-4 { top: 62%; right: 5%; }
.map-node.node-5 { bottom: 7%; left: 43%; }
.map-node.node-6 { top: 62%; left: 5%; }
.map-lines { position: absolute; inset: 0; width: 100%; height: 100%; opacity: .5; }
.map-lines line { stroke: rgba(138,216,255,.30); stroke-width: 1; stroke-dasharray: 3 7; animation: dash 12s linear infinite; }
@keyframes dash { to { stroke-dashoffset: -100; } }
.knowledge-list { display: grid; gap: 9px; }
.knowledge-card { padding: 15px; }
.knowledge-card summary { display: flex; align-items: center; gap: 10px; cursor: pointer; list-style: none; }
.knowledge-card summary::-webkit-details-marker { display: none; }
.knowledge-card summary .node-icon { display: grid; width: 33px; height: 33px; place-items: center; border-radius: 9px; color: var(--cyan); background: rgba(138,216,255,.09); }
.knowledge-card summary strong { flex: 1; font-size: .91rem; }
.knowledge-card summary span { color: var(--muted); font-size: .76rem; }
.child-list { display: grid; gap: 7px; margin: 13px 0 0 43px; }
.child-list a { display: flex; align-items: center; justify-content: space-between; color: var(--muted); font-size: .81rem; }
.child-list a:hover { color: var(--cyan); }
.child-list a small { color: var(--muted-2); }

.article-page { max-width: 920px; margin: 0 auto; }
.article-header { padding: 36px 0 24px; }
.article-header h1 { max-width: 860px; margin: 10px 0 15px; font-family: Georgia, "Noto Serif SC", serif; font-size: clamp(2rem, 5vw, 3.9rem); font-weight: 500; line-height: 1.26; letter-spacing: .02em; }
.article-summary { max-width: 760px; color: var(--muted); font-size: 1.04rem; }
.article-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-top: 21px; }
.article-layout { display: grid; grid-template-columns: minmax(0, 1fr) 220px; gap: 34px; align-items: start; }
.article-content { min-width: 0; padding: 30px; border: 1px solid var(--line); border-radius: var(--radius-xl); background: rgba(7,19,34,.68); box-shadow: var(--shadow); }
.article-content h2 { margin: 2.2em 0 .6em; color: #ecf6ff; font-family: Georgia, "Noto Serif SC", serif; font-size: 1.58rem; font-weight: 500; line-height: 1.45; }
.article-content h2:first-child { margin-top: 0; }
.article-content h3 { margin: 1.7em 0 .5em; font-size: 1.12rem; }
.article-content p, .article-content li { color: #cbd9e9; }
.article-content p { margin: .86em 0; }
.article-content ul, .article-content ol { padding-left: 1.45em; }
.article-content li + li { margin-top: .35em; }
.article-content blockquote { margin: 1.35em 0; padding: 14px 17px; border-left: 2px solid var(--violet); border-radius: 0 12px 12px 0; color: #ded9ff; background: rgba(185,167,255,.07); }
.article-content code { padding: .14em .36em; border: 1px solid rgba(138,216,255,.12); border-radius: 5px; color: #b6e6ff; background: rgba(138,216,255,.08); font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace; font-size: .9em; }
.article-content pre { margin: 1.25em 0; padding: 16px; overflow: auto; border: 1px solid var(--line); border-radius: 14px; background: #06101d; }
.article-content pre code { padding: 0; border: 0; color: #d1e8ff; background: transparent; font-size: .86rem; line-height: 1.7; }
.article-content table { width: 100%; margin: 1.25em 0; overflow: hidden; border-collapse: separate; border-spacing: 0; border: 1px solid var(--line); border-radius: 12px; }
.article-content th, .article-content td { padding: 10px 12px; border-bottom: 1px solid var(--line); color: #cbd9e9; text-align: left; font-size: .88rem; }
.article-content th { color: var(--cyan); background: rgba(138,216,255,.06); }
.article-content tr:last-child td { border-bottom: 0; }
.article-content a { color: var(--cyan); text-decoration: underline; text-decoration-color: rgba(138,216,255,.36); text-underline-offset: 3px; }
.article-diagram { display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: 9px; margin: 1.5em 0; padding: 18px; border: 1px solid var(--line); border-radius: 14px; background: radial-gradient(circle at center, rgba(138,216,255,.10), transparent 60%); }
.article-diagram div { padding: 7px 10px; border: 1px solid rgba(138,216,255,.24); border-radius: 9px; color: #d5ecff; background: rgba(138,216,255,.05); font-size: .78rem; }
.article-diagram span { color: var(--cyan); }
.article-diagram.vertical { flex-direction: column; }
.article-toc { position: sticky; top: 100px; padding: 15px; border-left: 1px solid var(--line); }
.article-toc h3 { margin: 0 0 9px; color: var(--muted); font-size: .75rem; letter-spacing: .1em; text-transform: uppercase; }
.article-toc a { display: block; padding: 5px 0; color: var(--muted); font-size: .78rem; line-height: 1.45; }
.article-toc a:hover { color: var(--cyan); }

.resource-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.resource-card { display: flex; flex-direction: column; min-height: 202px; padding: 19px; }
.resource-type { color: var(--cyan); font-size: .74rem; letter-spacing: .1em; text-transform: uppercase; }
.resource-card h3 { margin: 11px 0 7px; font-size: 1.06rem; }
.resource-card p { flex: 1; margin: 0; color: var(--muted); font-size: .85rem; }
.resource-footer { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-top: 20px; }
.resource-footer a { color: var(--cyan); font-size: .84rem; }
.upload-zone { display: grid; place-items: center; min-height: 178px; padding: 20px; border: 1px dashed rgba(138,216,255,.34); border-radius: var(--radius-lg); background: rgba(138,216,255,.025); text-align: center; }
.upload-zone strong { color: var(--cyan); }
.upload-zone p { max-width: 430px; margin: 7px 0 0; color: var(--muted); font-size: .84rem; }
.upload-zone input { display: none; }
.file-preview { margin-top: 12px; color: #cbe7ff; font-size: .82rem; }

.typing-layout { display: grid; grid-template-columns: 310px minmax(0, 1fr); gap: 18px; align-items: start; }
.typing-card { padding: 18px; }
.typing-card h3 { margin: 0 0 10px; font-family: Georgia, "Noto Serif SC", serif; font-weight: 500; }
.typing-set-list { display: grid; gap: 7px; }
.typing-set { width: 100%; padding: 11px; border: 1px solid transparent; border-radius: 10px; color: var(--muted); background: transparent; text-align: left; cursor: pointer; }
.typing-set:hover, .typing-set.is-active { border-color: var(--line); color: var(--ink); background: rgba(138,216,255,.07); }
.typing-set strong { display: block; font-size: .87rem; }
.typing-set span { display: block; margin-top: 3px; color: var(--muted-2); font-size: .72rem; }
.typing-workspace { padding: 24px; }
.typing-meta { display: flex; flex-wrap: wrap; gap: 18px; margin-bottom: 18px; }
.metric { color: var(--muted); font-size: .78rem; }
.metric strong { display: block; color: var(--cyan); font-family: Georgia, serif; font-size: 1.55rem; font-weight: 500; }
.typing-source { min-height: 190px; padding: 17px; overflow: auto; border: 1px solid var(--line); border-radius: 14px; color: #aec1d6; background: #060f1b; white-space: pre-wrap; font-family: "SFMono-Regular", Consolas, monospace; font-size: .92rem; line-height: 1.9; }
.typing-source .correct { color: var(--success); }
.typing-source .incorrect { color: var(--danger); text-decoration: underline; }
.typing-source .current { border-bottom: 2px solid var(--cyan); color: #fff; }
.typing-input { width: 100%; min-height: 138px; margin-top: 14px; padding: 15px; resize: vertical; border: 1px solid var(--line); border-radius: 14px; outline: 0; color: var(--ink); background: rgba(6,16,29,.8); font-family: "SFMono-Regular", Consolas, monospace; font-size: .91rem; line-height: 1.7; }
.typing-input:focus { border-color: rgba(138,216,255,.62); box-shadow: 0 0 0 3px rgba(138,216,255,.08); }
.typing-actions { display: flex; gap: 9px; margin-top: 12px; }

.profile-layout { display: grid; grid-template-columns: minmax(0, 1fr) 360px; gap: 18px; align-items: start; }
.profile-intro { padding: 28px; }
.profile-intro h2 { margin: 0 0 13px; font-family: Georgia, "Noto Serif SC", serif; font-size: 1.7rem; font-weight: 500; }
.profile-intro p { color: var(--muted); }
.skill-stack { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 22px; }
.skill-badge { padding: 7px 10px; border: 1px solid var(--line); border-radius: 99px; color: #cbe2f7; background: rgba(138,216,255,.05); font-size: .78rem; }
.principles { display: grid; gap: 9px; margin-top: 22px; }
.principle { display: grid; grid-template-columns: 26px 1fr; gap: 10px; padding: 12px; border-left: 1px solid var(--line-strong); background: rgba(138,216,255,.025); }
.principle b { color: var(--cyan); }
.principle p { margin: 0; font-size: .84rem; }

.admin-note { padding: 17px; border: 1px solid rgba(246,200,111,.30); border-radius: 13px; color: #f9dfae; background: rgba(246,200,111,.07); font-size: .86rem; }
.admin-layout { display: grid; grid-template-columns: 230px minmax(0, 1fr); gap: 18px; }
.admin-nav { display: grid; gap: 5px; padding: 10px; }
.admin-nav button { padding: 10px; border: 0; border-radius: 9px; color: var(--muted); background: transparent; text-align: left; cursor: pointer; }
.admin-nav button:hover, .admin-nav button.is-active { color: var(--ink); background: rgba(138,216,255,.08); }
.admin-workspace { min-width: 0; }
.admin-header { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 16px; }
.admin-header h2 { margin: 0; font-family: Georgia, "Noto Serif SC", serif; font-weight: 500; }
.admin-table-wrap { overflow: auto; border: 1px solid var(--line); border-radius: 14px; }
.admin-table { width: 100%; min-width: 680px; border-collapse: collapse; }
.admin-table th, .admin-table td { padding: 12px; border-bottom: 1px solid var(--line); text-align: left; font-size: .82rem; }
.admin-table th { color: var(--muted); background: rgba(138,216,255,.045); font-size: .72rem; letter-spacing: .08em; text-transform: uppercase; }
.admin-table tr:last-child td { border-bottom: 0; }
.admin-table td { color: #cbd9e9; }
.admin-table td.title-cell { max-width: 360px; color: var(--ink); }
.action-group { display: flex; gap: 6px; }
.form-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 13px; }
.form-field { display: grid; gap: 6px; }
.form-field.full { grid-column: 1 / -1; }
.form-field label { color: var(--muted); font-size: .78rem; }
.form-field input, .form-field textarea, .form-field select { width: 100%; padding: 10px 11px; border: 1px solid var(--line); border-radius: 9px; outline: none; color: var(--ink); background: rgba(6,16,29,.78); }
.form-field textarea { min-height: 260px; resize: vertical; font-family: "SFMono-Regular", Consolas, monospace; line-height: 1.58; }
.form-field input:focus, .form-field textarea:focus, .form-field select:focus { border-color: rgba(138,216,255,.62); box-shadow: 0 0 0 3px rgba(138,216,255,.07); }
.form-help { margin: 5px 0 0; color: var(--muted-2); font-size: .73rem; }
.admin-tabs { display: flex; gap: 7px; margin-bottom: 16px; overflow-x: auto; }
.admin-tab { padding: 8px 11px; border: 1px solid var(--line); border-radius: 8px; color: var(--muted); background: transparent; cursor: pointer; white-space: nowrap; font-size: .78rem; }
.admin-tab.is-active { border-color: rgba(138,216,255,.5); color: var(--ink); background: rgba(138,216,255,.08); }
.status-dot { display: inline-block; width: 7px; height: 7px; margin-right: 5px; border-radius: 50%; background: var(--success); box-shadow: 0 0 10px rgba(132,221,181,.45); }

.empty-state { display: grid; min-height: 250px; place-items: center; padding: 30px; border: 1px dashed var(--line-strong); border-radius: var(--radius-lg); color: var(--muted); text-align: center; }
.empty-state strong { display: block; margin-bottom: 6px; color: var(--ink); }

.site-footer { display: flex; max-width: var(--max); margin: 0 auto; padding: 28px 24px 40px; border-top: 1px solid var(--line); color: var(--muted); gap: 20px; justify-content: space-between; font-size: .8rem; }
.site-footer p { max-width: 500px; margin: 6px 0 0; }
.footer-meta { display: grid; align-content: end; gap: 5px; color: var(--muted-2); text-align: right; }
.footer-meta a { color: var(--muted-2); text-decoration: none; transition: color .15s; }
.footer-meta a:hover { color: var(--accent); }

.search-dialog, .modal { width: min(760px, calc(100vw - 28px)); padding: 0; border: 1px solid var(--line-strong); border-radius: 20px; color: var(--ink); background: rgba(7,18,33,.97); box-shadow: 0 24px 80px rgba(0,0,0,.55); backdrop-filter: blur(20px); }
.search-dialog::backdrop, .modal::backdrop { background: rgba(0, 7, 15, .68); backdrop-filter: blur(4px); }
.search-dialog > *, .modal > * { margin-right: 20px; margin-left: 20px; }
.search-dialog { padding-bottom: 20px; }
.dialog-heading { display: flex; align-items: start; justify-content: space-between; gap: 15px; margin-top: 20px; margin-bottom: 17px; }
.dialog-heading h2 { margin: 0; font-family: Georgia, "Noto Serif SC", serif; font-weight: 500; }
.large-search-box { margin-bottom: 10px; }
.search-hint { margin-bottom: 13px; color: var(--muted-2); font-size: .75rem; }
.search-results { display: grid; max-height: min(54vh, 520px); gap: 8px; overflow: auto; }
.search-result { display: grid; grid-template-columns: 34px 1fr auto; gap: 10px; align-items: center; padding: 11px; border: 1px solid transparent; border-radius: 10px; }
.search-result:hover { border-color: var(--line); background: rgba(138,216,255,.05); }
.search-result .search-icon { display: grid; width: 30px; height: 30px; place-items: center; border-radius: 8px; color: var(--cyan); background: rgba(138,216,255,.08); }
.search-result strong { display: block; font-size: .87rem; }
.search-result span { display: block; overflow: hidden; color: var(--muted); font-size: .75rem; text-overflow: ellipsis; white-space: nowrap; }
.search-result small { color: var(--muted-2); font-size: .7rem; }
.modal { padding-bottom: 20px; }
.modal > p { color: var(--muted); }
.dialog-actions { display: flex; justify-content: end; gap: 9px; margin-top: 20px; }
.toast-region { position: fixed; right: 18px; bottom: 18px; z-index: 100; display: grid; width: min(360px, calc(100vw - 36px)); gap: 9px; }
.toast { padding: 12px 14px; border: 1px solid var(--line-strong); border-radius: 12px; color: #d9ebfc; background: rgba(8,23,40,.94); box-shadow: var(--shadow); font-size: .85rem; animation: toast-in .25s ease; }
.toast.success { border-color: rgba(132,221,181,.36); }
.toast.error { border-color: rgba(255,134,148,.36); }
@keyframes toast-in { from { opacity: 0; transform: translateY(9px); } to { opacity: 1; transform: none; } }

@media (max-width: 990px) {
  .site-header { grid-template-columns: 1fr auto; }
  .desktop-nav { display: none; }
  .menu-button { display: inline-grid; }
  .content-grid, .knowledge-layout, .typing-layout, .profile-layout, .admin-layout { grid-template-columns: 1fr; }
  .article-layout { grid-template-columns: 1fr; }
  .article-toc { display: none; }
  .knowledge-map { min-height: 500px; }
  .admin-nav { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .admin-nav button { text-align: center; }
}

/* ===== 题库Tab切换 ===== */
.exam-tabs {
  display: flex;
  gap: 0;
  margin-bottom: 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--surface);
}

.exam-tab {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 20px;
  border: none;
  background: transparent;
  color: var(--muted);
  font-size: .95rem;
  font-weight: 500;
  cursor: pointer;
  transition: all .2s;
  position: relative;
}

.exam-tab:first-child {
  border-right: 1px solid var(--line);
}

.exam-tab:hover {
  background: var(--surface-light);
  color: var(--text);
}

.exam-tab.is-active {
  background: var(--surface-light);
  color: var(--cyan);
  font-weight: 600;
}

.exam-tab .tab-icon {
  font-size: 1.1rem;
}

.wrong-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 22px;
  height: 22px;
  padding: 0 6px;
  border-radius: 11px;
  background: var(--red, #e0556a);
  color: #fff;
  font-size: .72rem;
  font-weight: 700;
}

/* ===== 错题本布局 ===== */
.wrong-book-layout {
  max-width: 900px;
}

.wrong-book-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  padding: 16px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
}

.wrong-book-stats {
  display: flex;
  gap: 16px;
}

.wrong-book-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 80px 20px;
  text-align: center;
}

.wrong-book-empty .empty-icon {
  font-size: 4rem;
  margin-bottom: 20px;
}

.wrong-book-empty h2 {
  font-size: 1.4rem;
  margin-bottom: 12px;
  color: var(--text);
}

.wrong-book-empty p {
  color: var(--muted);
  margin-bottom: 24px;
  font-size: .95rem;
}

/* ===== 错题标记 ===== */
.wrong-mark {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border-radius: 6px;
  background: rgba(224, 85, 106, .15);
  color: var(--red, #e0556a);
  font-size: .72rem;
  font-weight: 600;
  letter-spacing: .03em;
}

.question-card.wrong-book-card {
  border-color: rgba(224, 85, 106, .2);
}

.question-card.wrong-book-card:hover {
  border-color: rgba(224, 85, 106, .35);
}

/* ===== 题目操作按钮 ===== */
.question-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 14px;
}

.remove-btn {
  color: var(--muted);
}

.remove-btn:hover {
  color: var(--red, #e0556a);
}

.chapter-wrong-count {
  font-size: .82rem;
  font-weight: 400;
  color: var(--muted);
  margin-left: 8px;
}

.exam-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 24px;
}

.exam-sidebar {
  position: sticky;
  top: 100px;
  height: fit-content;
}

.chapter-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.chapter-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: transparent;
  cursor: pointer;
  transition: all .15s;
  text-align: left;
}

.chapter-item:hover {
  border-color: var(--muted-2);
  background: var(--surface-light);
}

.chapter-number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--surface-light);
  font-size: .78rem;
  font-weight: 600;
}

.chapter-name {
  flex: 1;
  font-size: .9rem;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.chapter-count {
  color: var(--muted);
  font-size: .78rem;
}

.exam-content {
  width: 100%;
}

.chapter-block {
  margin-bottom: 40px;
}

.chapter-block h2 {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
  font-size: 1.35rem;
}

.question-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.question-card {
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
}

.question-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}

.question-type {
  padding: 4px 10px;
  border-radius: 6px;
  font-size: .75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .05em;
}

.question-type.single {
  background: rgba(128, 169, 255, .15);
  color: var(--blue);
}

.question-type.multiple {
  background: rgba(185, 167, 255, .15);
  color: var(--violet);
}

.question-number {
  color: var(--muted);
  font-size: .82rem;
}

.question-title {
  margin: 0 0 16px;
  font-size: 1.08rem;
  line-height: 1.7;
}

.options-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 18px;
}

.option-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all .15s;
}

.option-item:hover {
  border-color: var(--muted-2);
  background: var(--surface-light);
}

.option-item input {
  flex: 0 0 auto;
  margin-top: 4px;
  accent-color: var(--cyan);
}

.option-key {
  flex: 0 0 20px;
  font-weight: 600;
  color: var(--muted);
}

.option-text {
  flex: 1;
  font-size: .94rem;
  line-height: 1.6;
}

.option-item.correct-option {
  border-color: rgba(132, 221, 181, .4);
  background: rgba(132, 221, 181, .08);
}

.option-item.correct-option .option-key {
  color: var(--success);
}

.option-item.incorrect-option {
  border-color: rgba(255, 134, 148, .4);
  background: rgba(255, 134, 148, .08);
}

.option-item.incorrect-option .option-key {
  color: var(--danger);
}

.submit-btn {
  margin-bottom: 16px;
}

.submit-btn.disabled {
  opacity: .5;
  cursor: not-allowed;
}

.answer-result {
  padding: 16px;
  border-radius: var(--radius-md);
  margin-top: 16px;
}

.answer-result.correct {
  background: rgba(132, 221, 181, .1);
  border: 1px solid rgba(132, 221, 181, .3);
}

.answer-result.incorrect {
  background: rgba(255, 134, 148, .1);
  border: 1px solid rgba(255, 134, 148, .3);
}

.result-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.result-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  font-weight: 700;
  font-size: 1.1rem;
}

.answer-result.correct .result-icon {
  background: var(--success);
  color: #050d18;
}

.answer-result.incorrect .result-icon {
  background: var(--danger);
  color: #050d18;
}

.result-content p {
  margin: 8px 0;
  font-size: .92rem;
  line-height: 1.7;
}

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

@media (max-width: 960px) {
  .exam-layout {
    grid-template-columns: 1fr;
  }

  .exam-sidebar {
    position: static;
    order: 2;
  }

  .exam-content {
    order: 1;
  }

  .chapter-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  }

  .exam-tabs {
    flex-direction: column;
  }

  .exam-tab:first-child {
    border-right: none;
    border-bottom: 1px solid var(--line);
  }

  .wrong-book-header {
    flex-direction: column;
    gap: 12px;
  }
}

@media (max-width: 640px) {
  .question-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .question-actions .button {
    text-align: center;
  }

  .wrong-book-empty {
    padding: 40px 16px;
  }

  .wrong-book-empty .empty-icon {
    font-size: 3rem;
  }
}

@media (max-width: 720px) {
  .site-header { padding: 13px 16px; }
  .site-header.is-scrolled { margin: 0 8px; }
  .brand-text small { display: none; }
  main { padding: 12px 16px 46px; }
  .hero { padding-top: 36px; }
  .hero-grid { grid-template-columns: 1fr; }
  .orbit-card { min-height: 220px; }
  .stats-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); margin-bottom: 44px; }
  .module-grid, .resource-grid { grid-template-columns: 1fr; }
  .section { margin-top: 42px; }
  .section-head { align-items: start; flex-direction: column; gap: 8px; }
  .article-card { grid-template-columns: 90px 1fr; gap: 12px; padding: 11px; }
  .article-cover { min-height: 107px; }
  .article-card h3 { margin-top: 4px; font-size: .98rem; }
  .article-card p { -webkit-line-clamp: 2; font-size: .8rem; }
  .tags { display: none; }
  .article-content { padding: 20px; border-radius: 18px; }
  .article-header { padding-top: 22px; }
  .knowledge-map { min-height: 420px; padding: 12px; }
  .map-node { width: 95px; min-height: 57px; font-size: .67rem; }
  .map-node.node-1 { top: 5%; left: 2%; }
  .map-node.node-2 { top: 4%; left: 38%; }
  .map-node.node-3 { top: 21%; right: 1%; }
  .map-node.node-4 { top: 66%; right: 0; }
  .map-node.node-5 { bottom: 2%; left: 38%; }
  .map-node.node-6 { top: 66%; left: 0; }
  .map-core { width: 92px; height: 92px; font-size: .89rem; }
  .page-heading { margin: 22px 0; }
  .form-grid { grid-template-columns: 1fr; }
  .form-field.full { grid-column: auto; }
  .admin-nav { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .site-footer { padding: 22px 16px 30px; flex-direction: column; }
  .footer-meta { text-align: left; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; scroll-behavior: auto !important; }
}