:root {
  color-scheme: light;
  --paper: #f5f7f2;
  --surface: #ffffff;
  --surface-soft: #fbfcf9;
  --ink: #152a26;
  --ink-soft: #344b45;
  --muted: #5d6f68;
  --muted-light: #788a82;
  --line: #e2e9e3;
  --line-strong: #d3ded6;
  --green: #2f7d6c;
  --green-deep: #24604f;
  --green-soft: #e7f3ee;
  --blue: #3f6d84;
  --blue-soft: #eaf2f6;
  --rust: #9a5b3a;
  --rust-soft: #f7ede6;
  --amber: #8a6420;
  --amber-soft: #fdf6e7;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --shadow-sm: 0 1px 2px rgba(21, 42, 38, .04), 0 5px 16px rgba(21, 42, 38, .05);
  --shadow-md: 0 2px 4px rgba(21, 42, 38, .03), 0 18px 40px -14px rgba(21, 42, 38, .16);
  --shadow-lg: 0 4px 8px rgba(21, 42, 38, .04), 0 30px 60px -20px rgba(21, 42, 38, .22);
  --font-sans: Inter, "SF Pro Display", "Segoe UI", system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-serif: Georgia, "Songti SC", "Noto Serif SC", serif;
  --font-mono: "SFMono-Regular", "JetBrains Mono", "Cascadia Code", Consolas, "Liberation Mono", monospace;
  font-family: var(--font-sans);
  font-synthesis: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

* { box-sizing: border-box; }

html { overflow-x: clip; scroll-behavior: smooth; }

body {
  min-width: 320px;
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(1100px 620px at 12% -14%, rgba(64, 140, 120, .115), transparent 62%),
    radial-gradient(900px 520px at 98% -6%, rgba(84, 128, 154, .10), transparent 58%),
    radial-gradient(760px 560px at 50% 112%, rgba(190, 148, 110, .075), transparent 64%),
    var(--paper);
}

body::before {
  position: fixed;
  z-index: 0;
  inset: 0;
  content: "";
  background-image: radial-gradient(rgba(21, 42, 38, .10) .75px, transparent .75px);
  background-size: 22px 22px;
  pointer-events: none;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, .62), rgba(0, 0, 0, .16) 46%, transparent 82%);
}

::selection { color: var(--green-deep); background: rgba(96, 177, 154, .26); }

.page-shell {
  position: relative;
  z-index: 1;
  width: min(1320px, calc(100% - 64px));
  margin: 0 auto;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  z-index: 30;
  top: 14px;
  min-height: 62px;
  margin-top: 14px;
  padding: 0 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  border: 1px solid rgba(255, 255, 255, .72);
  border-radius: 16px;
  background: rgba(252, 253, 250, .78);
  box-shadow: 0 1px 0 rgba(255, 255, 255, .9) inset, var(--shadow-sm);
  backdrop-filter: blur(16px) saturate(1.3);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  color: var(--ink);
  text-decoration: none;
  font-size: 11px;
  font-weight: 760;
  letter-spacing: .16em;
}
.brand-mark {
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  border-radius: 9px;
  color: #fff;
  background: linear-gradient(140deg, #3b8d7b, #245f50);
  box-shadow: 0 4px 10px rgba(38, 105, 89, .28), 0 1px 0 rgba(255, 255, 255, .28) inset;
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 500;
  letter-spacing: 0;
}
.header-note {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 11px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  background: rgba(255, 255, 255, .65);
  font-size: 11px;
  letter-spacing: .03em;
  white-space: nowrap;
}
.header-pulse {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #5ba98c;
  box-shadow: 0 0 0 3px rgba(91, 169, 140, .14);
  animation: soft-pulse 3.2s ease-in-out infinite;
}

@keyframes soft-pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(91, 169, 140, .32); }
  50% { box-shadow: 0 0 0 5px rgba(91, 169, 140, 0); }
}

/* ---------- Intro ---------- */
.intro { padding: 68px 0 38px; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 22px;
  padding: 7px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: #566b62;
  background: rgba(255, 255, 255, .66);
  box-shadow: 0 1px 0 rgba(255, 255, 255, .8) inset;
  font-size: 9.5px;
  font-weight: 720;
  letter-spacing: .17em;
}
.eyebrow-dot,
.status-dot {
  width: 7px;
  height: 7px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: #5b9a83;
  box-shadow: 0 0 0 3px rgba(91, 154, 131, .14);
}
.eyebrow-line { width: 32px; height: 1px; background: linear-gradient(90deg, #c3d2c9, #e2e9e3); }

.intro-row {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 32px;
}
.intro-main { min-width: 0; }

h1 {
  margin: 0;
  font-size: clamp(40px, 5.2vw, 64px);
  line-height: 1.04;
  letter-spacing: -.058em;
  font-weight: 700;
}
h1 span {
  background: linear-gradient(112deg, #2f7d6c 8%, #3f7e93 92%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.intro-copy {
  max-width: 34em;
  margin: 17px 0 0;
  color: var(--muted);
  font-size: 14.5px;
  line-height: 1.75;
}
.version-note {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  margin: 10px 0 0;
  color: #6a7c74;
  font-size: 10.5px;
}
.version-note::before {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  content: "";
  background: #9db3a8;
}

.intro-aside {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 12px;
  padding-bottom: 4px;
  flex: 0 0 auto;
}
.version-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  color: #5d7169;
  background: rgba(255, 255, 255, .86);
  box-shadow: 0 1px 0 rgba(255, 255, 255, .9) inset, var(--shadow-sm);
  font-size: 11px;
  white-space: nowrap;
}
.version-pill strong { color: var(--ink); font-size: 12.5px; font-weight: 720; }
.version-pill > span:last-child { color: var(--muted-light); font-size: 10px; letter-spacing: .04em; }

.stack-chips { display: inline-flex; flex-wrap: wrap; gap: 6px; }
.stack-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, .6);
  color: var(--muted);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
}
.stack-chip::before {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  content: "";
  background: currentColor;
  opacity: .7;
}
.chip-rust { color: var(--rust); border-color: #ecdcd2; background: #fcf7f3; }
.chip-mcp { color: var(--blue); border-color: #dce8ee; background: #f6fafc; }
.chip-vue { color: var(--green); border-color: #d6e9e1; background: #f4faf7; }
.chip-go { color: #2f6f8f; border-color: #d7e6ee; background: #f2f9fc; }
.chip-python { color: #8a6a24; border-color: #eaddc2; background: #fdf9ee; }

/* ---------- Architecture ---------- */
.architecture { position: relative; padding-top: 4px; }

.root-node {
  position: relative;
  z-index: 1;
  width: min(350px, 100%);
  min-height: 92px;
  margin: 0 auto;
  padding: 16px 20px 16px 76px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  border: 1px solid #cbdcd2;
  border-radius: 18px;
  background:
    radial-gradient(120% 160% at 0% 0%, rgba(58, 141, 121, .07), transparent 52%),
    linear-gradient(180deg, #ffffff, #fbfdfb);
  box-shadow: 0 2px 4px rgba(21, 42, 38, .03), 0 18px 40px -12px rgba(35, 86, 70, .22);
}
.root-node::after {
  position: absolute;
  inset: 5px;
  border: 1px solid rgba(255, 255, 255, .9);
  border-radius: 14px;
  content: "";
  pointer-events: none;
}
.root-symbol {
  position: absolute;
  z-index: 1;
  top: 50%;
  left: 20px;
  width: 42px;
  height: 42px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 3.5px;
  border-radius: 12px;
  background: linear-gradient(145deg, #e5f4ee, #d5ebe2);
  box-shadow: 0 1px 0 rgba(255, 255, 255, .9) inset, 0 5px 12px rgba(44, 122, 103, .14);
  transform: translateY(-50%);
}
.root-symbol i { width: 4px; height: 14px; border-radius: 3px; background: linear-gradient(180deg, #3f9783, #2a6f5d); }
.root-symbol i:nth-child(2) { height: 21px; }
.root-symbol i:nth-child(3) { height: 10px; }
.root-label { color: #63766d; font-size: 8.5px; font-weight: 760; letter-spacing: .18em; }
.root-node strong { margin-top: 3px; font-size: 19px; line-height: 1.3; letter-spacing: -.02em; }
.root-version {
  position: absolute;
  top: 50%;
  right: 18px;
  padding: 4px 8px;
  border: 1px solid #dfe9e3;
  border-radius: 999px;
  color: #5c7168;
  background: rgba(255, 255, 255, .8);
  font-family: var(--font-mono);
  font-size: 9px;
  transform: translateY(-50%);
  white-space: nowrap;
}

.trunk {
  width: 1px;
  height: 24px;
  margin: 0 auto;
  background: linear-gradient(180deg, #c9d8d0, #b9ccc2);
}
.trunk-lower { height: 18px; background: linear-gradient(180deg, #b9ccc2, #c9d8d0); }

.flow-caption {
  margin: 0 0 9px;
  color: #73867d;
  font-size: 8.5px;
  font-weight: 740;
  letter-spacing: .2em;
  text-align: center;
}
.flow-ribbon {
  width: fit-content;
  max-width: 100%;
  min-height: 50px;
  margin: 0 auto;
  padding: 9px 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  overflow-x: auto;
  border: 1px solid rgba(255, 255, 255, .8);
  border-radius: 14px;
  background: rgba(255, 255, 255, .82);
  box-shadow: 0 1px 0 rgba(255, 255, 255, .9) inset, 0 10px 26px -12px rgba(35, 86, 70, .22);
  backdrop-filter: blur(8px);
  scrollbar-width: thin;
}
.flow-step {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 10px;
  border: 1px solid #e5ece7;
  border-radius: 9px;
  color: #435a51;
  background: #fafcfa;
  font-size: 9.5px;
  font-weight: 700;
  letter-spacing: .01em;
  white-space: nowrap;
}
.flow-step::before {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  content: "";
  background: currentColor;
  opacity: .45;
}
.flow-ui { color: #286e5c; border-color: #d2e7dd; background: #f0f8f4; }
.flow-core { color: #925338; border-color: #ecdcd2; background: #fbf4ef; }
.flow-mcp { color: #406a7e; border-color: #d9e7ed; background: #f2f8fa; }
.flow-link { flex: 0 0 auto; color: #9aac9f; font-size: 11px; }

.branch-connector {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1.13fr .92fr;
  gap: 18px;
  height: 22px;
  margin: 0 0 0;
}
.branch-connector::before {
  position: absolute;
  top: 0;
  right: calc(16.66% + 9px);
  left: calc(16.66% + 9px);
  height: 1px;
  content: "";
  background: linear-gradient(90deg, transparent, #c4d4cb 10%, #c4d4cb 90%, transparent);
}
.branch-connector span {
  position: relative;
  justify-self: center;
  width: 1px;
  height: 22px;
  background: #c4d4cb;
}
.branch-connector span::after {
  position: absolute;
  bottom: -2.5px;
  left: 50%;
  width: 5px;
  height: 5px;
  border: 1px solid #b7cbc1;
  border-radius: 50%;
  content: "";
  background: var(--paper);
  transform: translateX(-50%);
}

.branch-grid {
  position: relative;
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  align-items: start;
  gap: 18px;
}

.branch {
  position: relative;
  min-width: 0;
  overflow: visible;
  border: 1px solid #dbe4dd;
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, #ffffff, #fdfefd);
  box-shadow: 0 1px 0 rgba(255, 255, 255, .9) inset, var(--shadow-md);
  transition: transform .22s ease, box-shadow .22s ease, border-color .22s ease;
}
.branch:hover,
.branch:focus-within {
  z-index: 5;
  border-color: var(--accent-border);
  box-shadow: 0 1px 0 rgba(255, 255, 255, .9) inset, var(--shadow-lg);
  transform: translateY(-4px);
}
.branch::before {
  position: absolute;
  top: 0;
  right: 24px;
  left: 24px;
  height: 3px;
  border-radius: 0 0 4px 4px;
  content: "";
  background: linear-gradient(90deg, transparent, var(--accent) 18%, var(--accent) 82%, transparent);
  opacity: .8;
}
.branch-rust {
  --accent: #9a5b3a;
  --accent-soft: var(--rust-soft);
  --accent-border: rgba(154, 91, 58, .28);
}
.branch-mcp {
  --accent: #3f6d84;
  --accent-soft: var(--blue-soft);
  --accent-border: rgba(63, 109, 132, .28);
}
.branch-vue {
  --accent: #2c7a67;
  --accent-soft: var(--green-soft);
  --accent-border: rgba(44, 122, 103, .28);
}
.branch-go {
  --accent: #2f6f8f;
  --accent-soft: #e9f3f8;
  --accent-border: rgba(47, 111, 143, .28);
}
.branch-python {
  --accent: #8a6a24;
  --accent-soft: #f8f0dc;
  --accent-border: rgba(138, 106, 36, .28);
}
.branch-rust,
.branch-mcp,
.branch-vue { grid-column: span 2; }
.branch-go,
.branch-python { grid-column: span 3; }

.branch-heading {
  position: relative;
  min-height: 132px;
  padding: 22px 58px 18px 20px;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  border-bottom: 1px solid #edf1ee;
  border-radius: 20px 20px 0 0;
  background: linear-gradient(180deg, rgba(250, 252, 249, .7), transparent);
}
.branch-index {
  align-self: flex-start;
  width: 24px;
  height: 24px;
  margin-top: 1px;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  border: 1px solid var(--accent-border);
  border-radius: 7px;
  color: var(--accent);
  background: var(--accent-soft);
  font-family: var(--font-mono);
  font-size: 9.5px;
  font-weight: 800;
  letter-spacing: .04em;
}
.branch-kicker {
  margin: 1px 0 7px;
  color: var(--accent);
  font-size: 8.5px;
  font-weight: 780;
  letter-spacing: .17em;
  opacity: .82;
}
.branch-heading h2 {
  margin: 0;
  color: var(--ink);
  font-size: 20px;
  line-height: 1.3;
  letter-spacing: -.03em;
}
.branch-description {
  max-width: 39em;
  margin: 8px 0 0 !important;
  color: #5a6d65 !important;
  font-size: 11px !important;
  line-height: 1.62 !important;
}
.version-inline {
  display: block;
  margin-top: 5px;
  color: #63766d;
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 560;
  letter-spacing: 0;
}
.branch-glyph {
  position: absolute;
  top: 20px;
  right: 16px;
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  border: 1px solid var(--accent-border);
  border-radius: 10px;
  color: var(--accent);
  background: var(--accent-soft);
  box-shadow: 0 1px 0 rgba(255, 255, 255, .8) inset;
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 700;
}
.glyph-mcp { font-family: var(--font-sans); font-size: 11px; letter-spacing: .04em; }
.glyph-vue { font-family: var(--font-sans); font-size: 12px; }
.glyph-go,
.glyph-python { font-family: var(--font-sans); font-size: 10.5px; letter-spacing: .04em; }

.module-list {
  display: grid;
  gap: 8px;
  padding: 14px 16px 18px;
}
.module {
  padding: 14px 14px 15px;
  border: 1px solid #e8ede9;
  border-radius: var(--radius-md);
  background: linear-gradient(180deg, #fbfcfa, #f8faf7);
  transition: border-color .18s ease, background-color .18s ease, box-shadow .18s ease;
}
.module:hover {
  border-color: #d8e6dd;
  background: #fff;
  box-shadow: 0 6px 18px -10px rgba(21, 42, 38, .22);
}
.module h3 {
  display: flex;
  align-items: center;
  gap: 7px;
  margin: 0 0 9px;
  color: #2d433d;
  font-size: 12.5px;
  font-weight: 720;
  line-height: 1.45;
  letter-spacing: -.01em;
}
.module h3::before {
  width: 5px;
  height: 5px;
  flex: 0 0 auto;
  border-radius: 2px;
  content: "";
  background: var(--accent);
  opacity: .8;
}
.module p { margin: 0; color: #5c6e67; font-size: 11px; line-height: 1.68; }

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.tag-list li {
  position: relative;
  padding: 6px 10px;
  border: 1px solid #e4ebe6;
  border-radius: 8px;
  color: #4b6058;
  background: #fff;
  font-size: 11px;
  line-height: 1.35;
  transition: border-color .16s ease, color .16s ease, transform .16s ease, box-shadow .16s ease;
}
.tag-list li:hover {
  border-color: var(--accent-border);
  color: var(--accent);
  box-shadow: 0 4px 10px -6px rgba(21, 42, 38, .3);
  transform: translateY(-1px);
}
.tag-list li.versioned { padding-right: 12px; }

.module-compact { padding-top: 12px; padding-bottom: 13px; }
.module-title-row { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.module-title-row h3 { margin-bottom: 10px; }
.mini-badge {
  margin-top: -8px;
  padding: 3px 7px;
  border: 1px solid #d9e8ee;
  border-radius: 999px;
  color: #416779;
  background: #eff6f8;
  font-family: var(--font-mono);
  font-size: 8px;
  font-weight: 750;
  white-space: nowrap;
}

.sdk-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.sdk-card {
  min-width: 0;
  padding: 11px 11px 10px;
  border: 1px solid #e4ebea;
  border-radius: 10px;
  background: linear-gradient(180deg, #fff, #f8fbfa);
  transition: border-color .18s ease, box-shadow .18s ease;
}
.sdk-card:hover {
  border-color: #d3e3e9;
  box-shadow: 0 6px 16px -10px rgba(21, 42, 38, .24);
}
.sdk-kind {
  display: inline-block;
  padding: 2px 6px;
  border-radius: 5px;
  color: #4c6f7e;
  background: #eef5f7;
  font-size: 7.5px;
  font-weight: 800;
  letter-spacing: .12em;
}
.sdk-card h4 {
  min-height: 30px;
  overflow-wrap: anywhere;
  margin: 7px 0 5px;
  color: #294047;
  font-size: 10px;
  line-height: 1.45;
  letter-spacing: -.005em;
}
.sdk-version {
  display: inline-block;
  padding: 2px 6px;
  border: 1px solid #dce9ee;
  border-radius: 999px;
  color: #406a7e;
  background: #f3f9fb;
  font-family: var(--font-mono);
  font-size: 8px;
  font-weight: 700;
}
.sdk-name { min-height: 15px; margin-top: 5px !important; color: #5f706a !important; font-size: 9px !important; }
.plain-list { display: grid; gap: 5px; margin: 9px 0 0; padding: 0; list-style: none; }
.plain-list li {
  position: relative;
  padding-left: 10px;
  color: #5d6d68;
  font-size: 9px;
  line-height: 1.4;
  overflow-wrap: anywhere;
}
.plain-list li::before {
  position: absolute;
  top: .48em;
  left: 0;
  width: 3px;
  height: 3px;
  border-radius: 50%;
  content: "";
  background: #85a79d;
}

.stack-list { display: grid; gap: 0; margin: 0; padding: 0; list-style: none; }
.stack-list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin: 0 -7px;
  padding: 8px 7px;
  border-top: 1px solid #edf1ee;
  border-radius: 7px;
  color: #53645e;
  font-size: 11px;
  transition: background-color .16s ease;
}
.stack-list li:first-child { border-top: 0; padding-top: 4px; }
.stack-list li:hover { background: #fff; }
.stack-list strong {
  padding: 2px 7px;
  border: 1px solid #e3ebe6;
  border-radius: 999px;
  color: #314a43;
  background: #fff;
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 700;
  white-space: nowrap;
}
.optional-note { margin-top: 8px !important; color: #6c7d75 !important; font-size: 9px !important; }

.protocol-module { padding-bottom: 16px; }
.protocol-summary {
  margin: 2px 0 12px;
  padding: 13px 14px;
  border: 1px solid #d8e7ec;
  border-radius: 10px;
  background:
    radial-gradient(120% 160% at 0% 0%, rgba(74, 125, 148, .08), transparent 60%),
    linear-gradient(135deg, #f4f9fa, #f8fbf8);
}
.protocol-label { display: block; margin-bottom: 4px; color: #607c83; font-size: 8px; font-weight: 800; letter-spacing: .14em; }
.protocol-title-row { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.protocol-summary strong { display: block; color: #2d5666; font-size: 15px; letter-spacing: -.02em; }
.protocol-version {
  flex: 0 0 auto;
  padding: 3px 8px;
  border: 1px solid #cfe4da;
  border-radius: 999px;
  color: #2f6b5c;
  background: #eef7f2;
  box-shadow: 0 1px 0 rgba(255, 255, 255, .8) inset;
  font-family: var(--font-mono);
  font-size: 8.5px;
  font-weight: 700;
  letter-spacing: .01em;
  white-space: nowrap;
}
.protocol-summary p { margin: 4px 0 0; color: #536c70; font-size: 10px; }
.protocol-summary a {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  margin-top: 8px;
  color: #2f6b5c;
  font-size: 9.5px;
  font-weight: 700;
  text-decoration-color: rgba(47, 107, 92, .35);
  text-underline-offset: 3px;
  transition: gap .18s ease, color .18s ease;
}
.protocol-summary a:hover { gap: 6px; color: #245d4f; }
.transport-label { margin: 0 0 8px; color: #42544e; font-size: 10px; font-weight: 700; }
.transport-hint { display: block; margin-top: 3px; color: #6a7c74; font-size: 8.5px; }
.legacy-note {
  margin-top: 10px !important;
  padding: 7px 10px;
  border-left: 3px solid #dfc68c;
  border-radius: 0 7px 7px 0;
  color: #66593d !important;
  background: rgba(253, 246, 231, .8);
  font-size: 9.5px !important;
  line-height: 1.6 !important;
}

/* ---------- Footer ---------- */
.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-top: 26px;
  padding: 24px 2px 38px;
  border-top: 1px solid rgba(205, 216, 209, .65);
  color: #6a7c74;
  font-size: 9px;
  font-weight: 700;
  letter-spacing: .14em;
}
.footer-links { display: inline-flex; align-items: center; gap: 2px; }
.site-footer b { padding: 0 5px; color: #5e7b70; font-weight: 600; }

/* ---------- Tooltips ---------- */
.tech-tip { position: relative; cursor: help; outline: none; }
.tech-tip::after {
  position: absolute;
  z-index: 60;
  right: 0;
  bottom: calc(100% + 9px);
  width: max-content;
  max-width: min(320px, calc(100vw - 40px));
  padding: 10px 12px;
  border: 1px solid rgba(255, 255, 255, .08);
  border-radius: 10px;
  color: #eef5f1;
  background: #16261f;
  box-shadow: 0 16px 34px -8px rgba(12, 28, 22, .42);
  content: attr(data-tip);
  font-size: 11.5px;
  font-weight: 450;
  line-height: 1.6;
  letter-spacing: 0;
  text-align: left;
  white-space: normal;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(4px);
  transition: opacity .15s ease, transform .15s ease, visibility .15s;
}
.tech-tip:hover::after,
.tech-tip:focus-visible::after { opacity: 1; visibility: visible; transform: translateY(0); }
.tech-tip:focus-visible { outline: 2px solid var(--green); outline-offset: 3px; border-radius: 4px; }
.tech-tip.tip-start::after { right: auto; left: 0; }
.tech-tip.tip-below::after { top: calc(100% + 9px); bottom: auto; transform: translateY(-4px); }
.tech-tip.tip-below:hover::after,
.tech-tip.tip-below:focus-visible::after { transform: translateY(0); }

.versioned { position: relative; }
.version-value {
  display: inline-block;
  margin-left: 5px;
  color: #65776f;
  font-family: var(--font-mono);
  font-size: 8.5px;
  font-weight: 700;
  white-space: nowrap;
}
.new-version {
  display: inline-block;
  margin-left: 6px;
  padding: 2px 6px;
  border: 1px solid #f0d5a9;
  border-radius: 999px;
  color: #6d4a14;
  background: #fff4df;
  font-family: var(--font-sans);
  font-size: 8px;
  font-weight: 750;
  vertical-align: middle;
  white-space: nowrap;
}
.version-inline .new-version { margin-top: 4px; }

/* ---------- Version notice ---------- */
.version-notice {
  margin-top: 26px;
  padding: 16px 18px;
  border: 1px solid #e8dabb;
  border-radius: 16px;
  background:
    radial-gradient(100% 180% at 0% 0%, rgba(197, 153, 69, .08), transparent 60%),
    linear-gradient(180deg, #fffbf2, #fff9ec);
  box-shadow: 0 12px 30px -16px rgba(83, 66, 33, .28);
}
.version-notice[hidden] { display: none; }
.notice-heading { display: flex; align-items: center; gap: 10px; color: #493d27; font-size: 13.5px; }
.notice-icon {
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  border: 1px solid #efd9a8;
  border-radius: 8px;
  color: #7a5a19;
  background: linear-gradient(145deg, #fbecc8, #f7e3b5);
  font-size: 13px;
}
.notice-meta { margin: 7px 0 0; color: #5c4c2d; font-size: 10.5px; line-height: 1.6; }
.version-update-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 7px; margin: 11px 0 0; padding: 0; list-style: none; }
.version-update-list li {
  flex: 1 1 100%;
  min-width: 0;
  padding: 10px 12px;
  border: 1px solid #f0dfbf;
  border-radius: 10px;
  color: #4d422f;
  background: rgba(255, 255, 255, .72);
  font-size: 10.5px;
}
.version-update-list a { color: #294f44; font-weight: 700; text-decoration-thickness: 1px; text-underline-offset: 2px; }
.version-update-list a:focus-visible { outline: 2px solid var(--green); outline-offset: 2px; }
.version-update-list .version-arrow {
  padding: 2px 7px;
  border: 1px solid #ede0c9;
  border-radius: 999px;
  color: #6f5d3c;
  background: rgba(255, 255, 255, .7);
  font-family: var(--font-mono);
  font-size: 9px;
  white-space: nowrap;
}
.version-update-top { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.version-compare { margin-top: 9px; border-top: 1px solid #ede3d0; }
.version-compare summary {
  width: fit-content;
  padding: 8px 0 2px;
  color: #4d5b4f;
  cursor: pointer;
  font-size: 9.5px;
  font-weight: 700;
}
.version-compare summary:focus-visible { outline: 2px solid var(--green); outline-offset: 2px; border-radius: 3px; }
.release-compare-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; padding-top: 8px; }
.release-card { min-width: 0; padding: 10px 11px; border: 1px solid #e8e7dd; border-radius: 8px; background: #fff; }
.release-card h4 { margin: 0 0 6px; color: #30453b; font-size: 9.5px; }
.release-card p { margin: 0; color: #58635a; font-size: 9.5px; line-height: 1.6; white-space: pre-line; overflow-wrap: anywhere; }
.release-card a { display: inline-block; margin-top: 7px; color: #2f6b5c; font-size: 9.5px; font-weight: 650; }
.version-status-error { border-color: #e4c7c1; background: #fff4f1; }
.version-status-error .notice-heading,
.version-status-error .notice-meta { color: #713b31; }
.version-status-current { border-color: #cfe0d5; background: #f4faf5; }
.version-status-current .notice-heading,
.version-status-current .notice-meta { color: #315543; }
.version-status-current .notice-icon { border-color: #cfe4d8; color: #2f6b58; background: linear-gradient(145deg, #e4f4ec, #d6ede2); }

a:focus-visible { outline: 3px solid var(--green); outline-offset: 4px; border-radius: 4px; }

/* ---------- Responsive ---------- */
@media (max-width: 1080px) {
  .branch-heading { min-height: 142px; }
  .sdk-grid { grid-template-columns: 1fr; }
  .sdk-card h4 { min-height: 0; }
}

@media (max-width: 960px) {
  .page-shell { width: min(730px, calc(100% - 40px)); }
  .site-header { top: 10px; margin-top: 10px; }
  .intro { padding: 52px 0 32px; }
  .intro-row { align-items: flex-start; flex-direction: column; gap: 22px; }
  .intro-aside { width: 100%; align-items: flex-start; flex-direction: row; flex-wrap: wrap; padding-bottom: 0; }
  .stack-chips { max-width: 100%; }
  .branch-connector { display: none; }
  .trunk-lower { height: 20px; }
  .branch-grid { grid-template-columns: 1fr 1fr; gap: 16px; }
  .branch-mcp { grid-column: 1 / -1; grid-row: 1; }
  .branch-rust { grid-column: 1; grid-row: 2; }
  .branch-vue { grid-column: 2; grid-row: 2; }
  .branch-go,
  .branch-python { grid-column: 1 / -1; }
  .branch-heading { min-height: 132px; }
  .sdk-grid { grid-template-columns: 1fr 1fr; }
  .sdk-card h4 { min-height: 30px; }
  .version-update-list { grid-template-columns: 1fr; }
}

@media (max-width: 700px) {
  .intro-row { align-items: flex-start; flex-direction: column; gap: 22px; }
  .intro-aside { width: 100%; align-items: flex-start; flex-direction: row; flex-wrap: wrap; padding-bottom: 0; }
  .stack-chips { max-width: 100%; }
  .branch-grid { grid-template-columns: 1fr; }
  .branch-mcp,
  .branch-rust,
  .branch-vue,
  .branch-go,
  .branch-python { grid-column: 1; grid-row: auto; }
  .branch { transform: none; }
  .branch:hover,
  .branch:focus-within { transform: none; }
  .flow-ribbon { width: 100%; flex-wrap: wrap; justify-content: flex-start; overflow-x: visible; }
}

@media (max-width: 620px) {
  .page-shell { width: calc(100% - 32px); }
  .site-header { min-height: 56px; padding: 0 12px 0 14px; border-radius: 14px; }
  .brand { font-size: 10px; gap: 9px; }
  .brand-mark { width: 27px; height: 27px; font-size: 16px; }
  .header-note { font-size: 9.5px; padding: 5px 9px; }
  .intro { padding: 40px 0 26px; }
  .eyebrow { gap: 7px; margin-bottom: 18px; padding: 6px 10px; font-size: 8px; letter-spacing: .13em; }
  .eyebrow-line { width: 18px; }
  h1 { font-size: 36px; }
  .intro-copy { font-size: 13px; }
  .root-node { width: 100%; min-height: 86px; padding: 14px 16px 14px 68px; }
  .root-symbol { left: 16px; width: 38px; height: 38px; }
  .root-version { position: static; width: fit-content; margin-top: 5px; padding: 0; border: 0; background: none; transform: none; }
  .flow-caption { text-align: left; }
  .flow-ribbon { width: 100%; justify-content: flex-start; }
  .branch-heading { min-height: 124px; padding: 20px 52px 16px 16px; }
  .branch-heading h2 { font-size: 19px; }
  .branch-index { width: 22px; height: 22px; }
  .branch-glyph { top: 18px; right: 14px; width: 29px; height: 29px; }
  .module-list { padding: 12px 12px 14px; }
  .module { padding: 12px 12px 13px; }
  .sdk-grid { grid-template-columns: 1fr; }
  .sdk-card h4 { min-height: 0; }
  .site-footer { margin-top: 20px; padding: 20px 0 30px; font-size: 8px; letter-spacing: .09em; }
  .footer-links { gap: 0; }
  .tech-tip::after { max-width: min(280px, calc(100vw - 36px)); }
  .version-notice { padding: 13px 14px; border-radius: 14px; }
  .version-update-list { grid-template-columns: 1fr; }
  .version-update-top { align-items: flex-start; flex-direction: column; gap: 6px; }
  .release-compare-grid { grid-template-columns: 1fr; }
}

@media (max-width: 380px) {
  .header-note { display: none; }
  .stack-chips { flex-wrap: wrap; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
}

/* ---------- Editorial polish ---------- */
:root {
  --paper: #f1f5f2;
  --surface: #fffefa;
  --line: #dce6df;
  --line-strong: #cbd9d0;
  --shadow-sm: 0 2px 8px rgba(25, 54, 43, .045), 0 12px 28px -20px rgba(25, 54, 43, .2);
  --shadow-md: 0 4px 10px rgba(25, 54, 43, .04), 0 24px 54px -30px rgba(25, 54, 43, .3);
}

body {
  background:
    radial-gradient(ellipse 65% 42% at 50% -8%, rgba(73, 139, 116, .13), transparent 72%),
    radial-gradient(ellipse 42% 34% at 100% 32%, rgba(91, 135, 159, .09), transparent 72%),
    linear-gradient(180deg, #f7f9f5 0%, #eef3ef 100%);
}

body::before {
  opacity: .48;
  background-size: 28px 28px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, .38), transparent 68%);
}

.page-shell { width: min(1400px, calc(100% - 80px)); }
.site-header {
  min-height: 66px;
  border-color: rgba(255, 255, 255, .88);
  border-radius: 18px;
  background: rgba(255, 255, 252, .82);
  box-shadow: 0 1px 0 #fff inset, 0 10px 32px -24px rgba(25, 54, 43, .38);
}
.intro { padding-top: 76px; padding-bottom: 44px; }
.eyebrow { color: #48665a; background: rgba(255, 255, 252, .82); }
h1 { font-size: clamp(44px, 5.4vw, 70px); letter-spacing: -.065em; }
.intro-copy { color: #4e655b; font-size: 15px; }
.version-note { color: #60766b; font-size: 11px; }
.root-node {
  width: min(390px, 100%);
  min-height: 102px;
  border-color: #c4d9cd;
  border-radius: 22px;
  box-shadow: 0 2px 5px rgba(21, 42, 38, .035), 0 24px 50px -26px rgba(35, 86, 70, .38);
}
.root-node strong { font-size: 22px; }
.root-label, .flow-caption { font-size: 9px; }
.flow-caption { margin-top: 25px; color: #637a6e; letter-spacing: .17em; }
.flow-ribbon {
  gap: 5px;
  padding: 8px;
  border-color: #dce7df;
  border-radius: 16px;
  background: rgba(255, 255, 252, .76);
  box-shadow: 0 8px 22px -20px rgba(21, 42, 38, .3);
}
.flow-step { padding: 9px 13px; color: #425a50; font-size: 10.5px; }
.flow-link { color: #8ba497; }
.branch-grid { gap: 22px; }
.branch {
  border-color: #dce6df;
  border-radius: 22px;
  background: rgba(255, 255, 252, .94);
  box-shadow: 0 2px 5px rgba(21, 42, 38, .025), 0 18px 42px -28px rgba(21, 42, 38, .32);
}
.branch:hover, .branch:focus-within {
  box-shadow: 0 5px 12px rgba(21, 42, 38, .045), 0 26px 52px -28px rgba(21, 42, 38, .36);
}
.branch-heading { min-height: 158px; padding: 27px 62px 22px 26px; }
.branch-index { width: 27px; height: 27px; font-size: 10px; }
.branch-heading h2 { font-size: 22px; }
.branch-description { max-width: 38em; color: #526a5f; font-size: 12px !important; line-height: 1.75 !important; }
.branch-glyph { top: 24px; right: 22px; width: 35px; height: 35px; }
.module-list { gap: 10px; padding: 17px 18px 20px; }
.module {
  padding: 15px 16px 16px;
  border-color: #e5ebe5;
  border-radius: 14px;
  background: linear-gradient(145deg, #fff 0%, #fbfcf9 100%);
}
.module h3 { font-size: 13px; }
.module p { color: #586e63; font-size: 12px; }
.tag-list { gap: 7px; margin-top: 11px; }
.tag-list li { padding: 7px 10px; font-size: 11px; }
.sdk-card { border-radius: 13px; }
.sdk-card h4 { font-size: 11px; }
.plain-list li { font-size: 10px; }
.protocol-summary { border-radius: 15px; }
.site-footer { color: #61766c; }

@media (max-width: 960px) {
  .page-shell { width: min(760px, calc(100% - 40px)); }
  .branch-grid { gap: 16px; }
  .branch-heading { min-height: 148px; padding: 24px 56px 20px 20px; }
}

@media (max-width: 620px) {
  .page-shell { width: calc(100% - 32px); }
  .intro { padding-top: 44px; }
  h1 { font-size: 38px; }
  .branch-heading { min-height: 132px; padding: 20px 52px 16px 16px; }
  .module-list { padding: 12px 12px 14px; }
}

/* ---------- Enriched architecture: call paths, cross-cutting, delivery ---------- */
.chip-ops { color: var(--amber); border-color: #ecdfc2; background: #fdf8ec; }

.flow-paths {
  display: grid;
  gap: 7px;
  width: 100%;
  margin: 0 auto;
}
.flow-path { display: flex; align-items: center; gap: 12px; }
.flow-path-label {
  flex: 0 0 96px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: #5c7267;
  font-size: 9px;
  font-weight: 700;
  letter-spacing: .06em;
  white-space: nowrap;
}
.flow-path-label b {
  padding: 2px 5px;
  border: 1px solid var(--line);
  border-radius: 5px;
  color: var(--green-deep);
  background: #fff;
  font-family: var(--font-mono);
  font-size: 8px;
  letter-spacing: .04em;
}
.flow-path .flow-ribbon {
  flex: 1 1 auto;
  width: auto;
  margin: 0;
  justify-content: flex-start;
}

.crosscut,
.delivery {
  margin-top: 32px;
  padding-top: 28px;
  border-top: 1px solid rgba(205, 216, 209, .7);
}
.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 28px;
  margin-bottom: 17px;
}
.section-kicker {
  margin: 0 0 6px;
  color: #60766b;
  font-size: 9px;
  font-weight: 760;
  letter-spacing: .17em;
}
.section-head h2 {
  margin: 0;
  color: var(--ink);
  font-size: 21px;
  line-height: 1.3;
  letter-spacing: -.03em;
}
.section-intro {
  max-width: 42em;
  margin: 0;
  color: #5c6f66;
  font-size: 11.5px;
  line-height: 1.7;
  text-align: right;
}

.crosscut-grid {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 10px;
}
.crosscut-item {
  min-width: 0;
  padding: 13px 13px 14px;
  border: 1px solid #e2ebe4;
  border-radius: 13px;
  background: linear-gradient(160deg, #fff, #f8fbf8);
  box-shadow: 0 1px 0 #fff inset;
  transition: border-color .18s ease, box-shadow .18s ease, transform .18s ease;
}
.crosscut-item:hover,
.crosscut-item:focus-visible {
  border-color: #cfe0d5;
  box-shadow: 0 10px 24px -16px rgba(21, 42, 38, .38);
  transform: translateY(-2px);
}
.crosscut-tag {
  display: inline-block;
  padding: 2px 6px;
  border-radius: 5px;
  color: #47685d;
  background: #edf5f0;
  font-family: var(--font-mono);
  font-size: 7.5px;
  font-weight: 800;
  letter-spacing: .12em;
}
.crosscut-item h3 {
  margin: 8px 0 5px;
  color: #2d433d;
  font-size: 12px;
  line-height: 1.4;
  letter-spacing: -.01em;
}
.crosscut-item p {
  margin: 0;
  color: #5c6e67;
  font-size: 10px;
  line-height: 1.62;
}

.pipeline-track {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.pipeline-stage {
  position: relative;
  min-width: 0;
  padding: 13px 13px 14px;
  border: 1px solid #e2ebe4;
  border-radius: 13px;
  background: rgba(255, 255, 252, .86);
  box-shadow: 0 1px 0 #fff inset;
  transition: border-color .18s ease, box-shadow .18s ease, transform .18s ease;
}
.pipeline-stage::before {
  position: absolute;
  top: 0;
  right: 13px;
  left: 13px;
  height: 2px;
  border-radius: 2px;
  content: "";
  background: linear-gradient(90deg, var(--green), transparent);
  opacity: .5;
}
.pipeline-stage::after {
  position: absolute;
  top: 50%;
  right: -8px;
  content: "→";
  color: #a3b6aa;
  font-size: 11px;
  transform: translateY(-50%);
}
.pipeline-stage:last-child::after { content: none; }
.pipeline-stage:hover,
.pipeline-stage:focus-visible {
  border-color: #cfe0d5;
  box-shadow: 0 10px 24px -16px rgba(21, 42, 38, .38);
  transform: translateY(-2px);
}
.pipeline-index {
  color: #6d8378;
  font-family: var(--font-mono);
  font-size: 8.5px;
  font-weight: 800;
  letter-spacing: .08em;
}
.pipeline-stage h3 {
  margin: 6px 0 5px;
  color: #2d433d;
  font-size: 12px;
  line-height: 1.4;
}
.pipeline-stage p {
  margin: 0;
  color: #5c6e67;
  font-size: 10px;
  line-height: 1.62;
}

.module-note {
  margin: 9px 0 0 !important;
  color: #6c7d75 !important;
  font-size: 9px !important;
  line-height: 1.55 !important;
}

.protocol-lifecycle {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: protocol-step;
}
.protocol-lifecycle li {
  position: relative;
  padding: 5px 8px 5px 19px;
  border: 1px solid #dce9ee;
  border-radius: 7px;
  color: #4b6670;
  background: #f7fbfc;
  font-family: var(--font-mono);
  font-size: 8.5px;
  line-height: 1.3;
  white-space: nowrap;
}
.protocol-lifecycle li::before {
  position: absolute;
  top: 50%;
  left: 7px;
  color: #7d9aa3;
  counter-increment: protocol-step;
  content: counter(protocol-step);
  font-size: 7.5px;
  transform: translateY(-50%);
}

@media (max-width: 1080px) {
  .crosscut-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .pipeline-track { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .pipeline-stage::after { content: none; }
}

@media (max-width: 960px) {
  .flow-path { align-items: flex-start; flex-direction: column; gap: 6px; }
  .flow-path-label { flex-basis: auto; }
  .flow-path .flow-ribbon { width: 100%; }
  .section-head { align-items: flex-start; flex-direction: column; gap: 8px; }
  .section-intro { max-width: none; text-align: left; }
}

@media (max-width: 700px) {
  .crosscut-grid,
  .pipeline-track { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .crosscut,
  .delivery { margin-top: 26px; padding-top: 22px; }
  .section-head h2 { font-size: 19px; }
}

@media (max-width: 460px) {
  .crosscut-grid,
  .pipeline-track { grid-template-columns: 1fr; }
  .flow-path-label { font-size: 8.5px; }
}

@media (max-width: 960px) {
  .flow-path .flow-ribbon {
    flex-wrap: wrap;
    justify-content: flex-start;
    overflow-x: visible;
    counter-reset: flow-step;
  }
  .flow-path .flow-link { display: none; }
  .flow-path .flow-step { counter-increment: flow-step; }
  .flow-path .flow-step::before {
    width: auto;
    height: auto;
    border-radius: 0;
    content: counter(flow-step);
    color: currentColor;
    background: none;
    font-family: var(--font-mono);
    font-size: 8px;
    opacity: .72;
  }
}

.branch-grid { align-items: stretch; }
.branch { display: flex; flex-direction: column; }
.branch .module-list { flex: 1 1 auto; align-content: start; }