:root {
  --ink: #24121b;
  --paper: #f7efef;
  --accent: #ffc4d6;
  --accent-2: #c9e4ff;
  --signal: #d6006e;
  --kicker: #a3124f;
}

/* Shared project-page system for github.com/teddashh repositories.
   Per-project colors are injected as :root variables above this file's rules. */

:root {
  --ink-soft: color-mix(in srgb, var(--ink) 76%, var(--paper));
  --ink-faint: color-mix(in srgb, var(--ink) 52%, var(--paper));
  --paper-strong: color-mix(in srgb, var(--paper) 35%, #ffffff);
  --line: color-mix(in srgb, var(--ink) 14%, transparent);
  --shadow: 0 24px 80px color-mix(in srgb, var(--ink) 12%, transparent);
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  --serif: Georgia, "Times New Roman", "Noto Serif TC", "Songti TC", serif;
  --max: 1180px;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 92px;
}

html[data-lang="en"] .lang-zh,
html[data-lang="zh"] .lang-en {
  display: none !important;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 7% 3%, color-mix(in srgb, var(--accent) 40%, transparent), transparent 24rem),
    radial-gradient(circle at 97% 26%, color-mix(in srgb, var(--accent-2) 30%, transparent), transparent 31rem),
    var(--paper);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

html[data-lang="zh"] body { line-height: 1.75; }

/* Keep Chinese headings and quotes from splitting a word across lines: break at
   spaces, punctuation, and the word boundaries app.js marks, balance the
   lines, and only fall back to any point if a single word cannot fit. */
html[data-lang="zh"] h1,
html[data-lang="zh"] h2,
html[data-lang="zh"] .quote {
  word-break: keep-all;
  overflow-wrap: anywhere;
  text-wrap: balance;
}

/* Keep a lone character or word off the last line of body copy. */
p, li { text-wrap: pretty; }

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

button, a { -webkit-tap-highlight-color: transparent; }

button:focus-visible,
a:focus-visible {
  outline: 3px solid var(--signal);
  outline-offset: 4px;
}

code {
  font-family: var(--mono);
  font-size: 0.9em;
}

code.nowrap { white-space: nowrap; }

.skip-link {
  position: fixed;
  z-index: 100;
  top: 12px;
  left: 12px;
  transform: translateY(-150%);
  padding: 10px 14px;
  border-radius: 8px;
  background: var(--ink);
  color: #fff;
}

.skip-link:focus { transform: none; }

/* ---------- header ---------- */

.site-header {
  position: sticky;
  z-index: 20;
  top: 0;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--paper) 86%, transparent);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.header-inner {
  width: min(calc(100% - 40px), var(--max));
  height: 76px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 28px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  font-size: 1.05rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  text-decoration: none;
  white-space: nowrap;
}

.brand img {
  width: 36px;
  height: 36px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 24px;
  margin-left: auto;
}

.site-nav a {
  color: var(--ink-soft);
  font-size: 0.9rem;
  font-weight: 700;
  text-decoration: none;
}

.site-nav a:hover { color: var(--ink); }

.language-switch {
  display: flex;
  padding: 3px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: color-mix(in srgb, #ffffff 48%, transparent);
}

.language-switch button {
  min-width: 42px;
  border: 0;
  border-radius: 999px;
  padding: 6px 9px;
  color: var(--ink-soft);
  background: transparent;
  cursor: pointer;
  font: inherit;
  font-size: 0.75rem;
  font-weight: 800;
}

.language-switch button[aria-pressed="true"] {
  color: #fff;
  background: var(--ink);
}

.github-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 13px;
  border: 1px solid var(--ink);
  border-radius: 999px;
}

.site-nav .github-link { color: var(--ink); }

.github-link svg { width: 16px; height: 16px; }

.menu-button {
  display: none;
  margin-left: auto;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 8px 12px;
  background: var(--paper-strong);
  color: var(--ink);
  font: inherit;
  font-size: 0.82rem;
  font-weight: 800;
}

main { overflow: hidden; }

.hero,
.section,
.footer-inner {
  width: min(calc(100% - 40px), var(--max));
  margin-inline: auto;
}

/* ---------- hero ---------- */

.hero {
  min-height: 680px;
  padding: 100px 0 90px;
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(360px, 0.92fr);
  align-items: center;
  gap: clamp(48px, 7vw, 96px);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 22px;
  font-size: 0.76rem;
  font-weight: 900;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.eyebrow::before {
  flex: none;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--signal);
  box-shadow: 0 0 0 5px color-mix(in srgb, var(--signal) 14%, transparent);
  content: "";
}

h1, h2, h3, p { margin-top: 0; }

h1 {
  max-width: 760px;
  margin-bottom: 25px;
  font-size: clamp(3.1rem, 6.6vw, 6.3rem);
  line-height: 0.95;
  letter-spacing: -0.07em;
}

.hero-copy h1.lang-zh {
  font-size: clamp(2.6rem, 4.7vw, 4.5rem);
  line-height: 1.08;
  letter-spacing: -0.04em;
}

h1 em {
  position: relative;
  z-index: 0;
  display: inline-block;
  font-family: var(--serif);
  font-weight: 400;
}

h1.lang-zh em { font-weight: 700; font-style: normal; }

h1 em::after {
  position: absolute;
  z-index: -1;
  right: -0.05em;
  bottom: 0.05em;
  left: 0;
  height: 0.28em;
  border-radius: 999px;
  background: var(--accent);
  content: "";
  transform: rotate(-1.5deg);
}

.hero-copy > p {
  max-width: 630px;
  margin-bottom: 31px;
  color: var(--ink-soft);
  font-size: clamp(1.05rem, 1.8vw, 1.22rem);
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.button {
  display: inline-flex;
  min-height: 50px;
  align-items: center;
  justify-content: center;
  gap: 9px;
  border: 1px solid var(--ink);
  border-radius: 999px;
  padding: 12px 20px;
  font-size: 0.9rem;
  font-weight: 850;
  text-decoration: none;
  transition: transform 160ms ease, box-shadow 160ms ease;
}

.button:hover { transform: translateY(-2px); }

.button-primary {
  color: #fff;
  background: var(--ink);
  box-shadow: 0 8px 24px color-mix(in srgb, var(--ink) 18%, transparent);
}

.button-secondary { background: color-mix(in srgb, #ffffff 40%, transparent); }

.hero-notes {
  display: flex;
  flex-wrap: wrap;
  gap: 9px 20px;
  margin-top: 25px;
  color: var(--ink-soft);
  font-size: 0.78rem;
  font-weight: 750;
}

.hero-notes > span::before {
  margin-right: 7px;
  color: var(--kicker);
  content: "●";
}

/* ---------- hero visuals ---------- */

.visual-wrap {
  position: relative;
  padding: 20px;
}

.visual-wrap::before {
  position: absolute;
  inset: -9% -7% 15% 12%;
  border-radius: 48% 52% 40% 60%;
  background: var(--accent-2);
  content: "";
  transform: rotate(4deg);
}

.visual-wrap.is-image::before { inset: 4% -6% -6% 10%; }

.panel {
  position: relative;
  overflow: hidden;
  border: 1px solid color-mix(in srgb, #ffffff 9%, transparent);
  border-radius: 24px;
  color: #eef3f0;
  background: var(--ink);
  box-shadow: 0 36px 90px color-mix(in srgb, var(--ink) 28%, transparent);
  transform: rotate(-1.8deg);
}

.panel-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 17px 20px;
  border-bottom: 1px solid color-mix(in srgb, #ffffff 10%, transparent);
  color: color-mix(in srgb, #eef3f0 72%, transparent);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* a long file name in the panel title wraps instead of widening the hero */
.panel-top > span:first-child { min-width: 0; overflow-wrap: anywhere; }

.live-dot {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--accent);
  white-space: nowrap;
}

.live-dot::before {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: currentColor;
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 12%, transparent);
  content: "";
}

.panel-body { padding: 24px; }

.panel-name {
  margin-bottom: 4px;
  font-family: var(--mono);
  font-size: 1.22rem;
  font-weight: 800;
  overflow-wrap: anywhere;
}

.panel-meta {
  margin-bottom: 22px;
  color: color-mix(in srgb, #eef3f0 55%, transparent);
  font-size: 0.78rem;
}

.check-list {
  position: relative;
  display: grid;
  gap: 3px;
}

.check-list::before {
  position: absolute;
  top: 17px;
  bottom: 17px;
  left: 12px;
  width: 1px;
  background: color-mix(in srgb, #ffffff 15%, transparent);
  content: "";
}

.check-row {
  position: relative;
  display: grid;
  grid-template-columns: 25px 1fr auto;
  align-items: center;
  gap: 12px;
  min-height: 52px;
  font-size: 0.82rem;
}

.check-mark {
  z-index: 1;
  display: grid;
  width: 25px;
  height: 25px;
  place-items: center;
  border: 3px solid var(--ink);
  border-radius: 50%;
  color: var(--ink);
  background: var(--accent);
  font-size: 0.66rem;
  font-weight: 950;
}

.check-mark.is-wait { background: color-mix(in srgb, #ffffff 22%, transparent); color: #eef3f0; }
.check-mark.is-warn { background: #ffc46b; }
.check-mark.is-fail { background: #ff8a7a; }

.check-row strong { display: block; }

.check-row small,
.check-side {
  display: block;
  color: color-mix(in srgb, #eef3f0 52%, transparent);
  font-family: var(--mono);
  font-size: 0.72rem;
  overflow-wrap: anywhere;
}

.panel-footer {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin: 24px -24px -24px;
  padding: 16px 24px;
  color: var(--ink);
  background: var(--accent);
  font-size: 0.78rem;
  font-weight: 900;
}

/* terminal */
.term {
  margin: 0;
  padding: 22px 24px 26px;
  font-family: var(--mono);
  font-size: 0.8rem;
  line-height: 1.75;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.term .t-cmd { color: #ffffff; }
.term .t-cmd::before { color: var(--accent); content: "$ "; }
.term .t-out { color: color-mix(in srgb, #eef3f0 70%, transparent); }
.term .t-dim { color: color-mix(in srgb, #eef3f0 42%, transparent); }
.term .t-ok { color: var(--accent); }
.term .t-warn { color: #ffc46b; }
.term .t-err { color: #ff8a7a; }
.term span { display: block; }

.dots { display: inline-flex; gap: 6px; }
.dots i {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: color-mix(in srgb, #ffffff 22%, transparent);
}

/* report (light card) */
.panel.is-light {
  color: var(--ink);
  background: var(--paper-strong);
  border-color: var(--line);
}

.panel.is-light .panel-top {
  color: var(--ink-faint);
  border-bottom-color: var(--line);
}

.panel.is-light .panel-meta { color: var(--ink-faint); }

.report-title {
  margin-bottom: 4px;
  font-size: 1.45rem;
  font-weight: 850;
  letter-spacing: -0.03em;
}

.report-row {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 14px;
  padding: 14px 0;
  border-top: 1px solid var(--line);
}

.report-row strong { display: block; font-size: 0.95rem; line-height: 1.3; }
.report-row small { color: var(--ink-faint); font-family: var(--mono); font-size: 0.72rem; }

.pill {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 850;
  white-space: nowrap;
}

.pill-critical { color: #8a1c12; background: #ffd8d2; }
.pill-high { color: #7a4300; background: #ffe6b3; }
.pill-medium { color: #5c4a00; background: #fff2b8; }
.pill-ok { color: #135a3d; background: #c9f0dc; }
.pill-info { color: #1d3f7a; background: #d6e4ff; }
.pill-muted { color: var(--ink-soft); background: color-mix(in srgb, var(--ink) 8%, transparent); }

.panel.is-light .panel-footer {
  margin-top: 18px;
}

/* chat */
.chat {
  display: grid;
  gap: 12px;
  padding: 22px;
}

.bubble {
  max-width: 88%;
  padding: 12px 15px;
  border-radius: 16px;
  font-size: 0.85rem;
  line-height: 1.5;
}

.bubble small {
  display: block;
  margin-bottom: 4px;
  font-size: 0.68rem;
  font-weight: 850;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  opacity: 0.7;
}

.bubble-user {
  justify-self: end;
  color: var(--ink);
  background: var(--accent);
  border-bottom-right-radius: 5px;
}

.bubble-ai {
  justify-self: start;
  color: #eef3f0;
  background: color-mix(in srgb, #ffffff 8%, transparent);
  border: 1px solid color-mix(in srgb, #ffffff 12%, transparent);
  border-bottom-left-radius: 5px;
}

.bubble-system {
  justify-self: center;
  max-width: 100%;
  color: color-mix(in srgb, #eef3f0 60%, transparent);
  background: transparent;
  font-family: var(--mono);
  font-size: 0.72rem;
  text-align: center;
}

.bubble .cite {
  display: inline-block;
  margin-top: 8px;
  padding: 3px 8px;
  border-radius: 999px;
  background: color-mix(in srgb, #ffffff 10%, transparent);
  font-family: var(--mono);
  font-size: 0.68rem;
}

/* stack */
.stack {
  display: grid;
  gap: 10px;
  padding: 20px;
}

.stack-card {
  display: grid;
  grid-template-columns: 42px 1fr auto;
  align-items: center;
  gap: 13px;
  padding: 13px;
  border: 1px solid color-mix(in srgb, #ffffff 12%, transparent);
  border-radius: 14px;
  background: color-mix(in srgb, #ffffff 5%, transparent);
}

.stack-icon {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  border-radius: 11px;
  color: var(--ink);
  background: var(--accent);
  font-family: var(--mono);
  font-weight: 900;
}

.stack-card strong, .stack-card small { display: block; }
.stack-card small { color: color-mix(in srgb, #eef3f0 55%, transparent); font-family: var(--mono); font-size: 0.72rem; }

.stack-status {
  padding: 5px 8px;
  border-radius: 999px;
  color: var(--ink);
  background: color-mix(in srgb, var(--accent) 85%, #ffffff);
  font-size: 0.66rem;
  font-weight: 900;
  text-transform: uppercase;
  white-space: nowrap;
}

/* framed screenshot */
.shot {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--paper-strong);
  box-shadow: 0 36px 90px color-mix(in srgb, var(--ink) 22%, transparent);
}

.visual-wrap .shot { transform: rotate(-1.4deg); }

.shot img {
  display: block;
  width: 100%;
  height: auto;
}

.shot figcaption {
  padding: 12px 16px;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 0.8rem;
}

/* ---------- stats ---------- */

.stats {
  width: min(calc(100% - 40px), var(--max));
  margin: -30px auto 0;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.stats.n2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.stats.n3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.stat {
  padding: 26px 24px 28px 0;
}

.stat + .stat {
  padding-left: 24px;
  border-left: 1px solid var(--line);
}

.stat-value {
  display: block;
  margin-bottom: 6px;
  font-family: var(--serif);
  font-size: clamp(2.2rem, 4vw, 3.2rem);
  line-height: 1;
  letter-spacing: -0.03em;
}

.stat-label {
  color: var(--ink-soft);
  font-size: 0.86rem;
  font-weight: 700;
}

/* ---------- sections ---------- */

.section { padding: 105px 0; }

.section-kicker {
  margin-bottom: 13px;
  color: var(--kicker);
  font-size: 0.76rem;
  font-weight: 900;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.section-heading {
  display: grid;
  grid-template-columns: 1fr 0.72fr;
  gap: 70px;
  align-items: end;
  margin-bottom: 55px;
}

h2 {
  margin-bottom: 0;
  font-size: clamp(2.3rem, 4.8vw, 4.5rem);
  line-height: 1;
  letter-spacing: -0.055em;
}

h2.lang-zh {
  font-size: clamp(2.1rem, 4.2vw, 3.8rem);
  line-height: 1.12;
  letter-spacing: -0.03em;
}

.section-heading p {
  margin-bottom: 3px;
  color: var(--ink-soft);
  font-size: 1rem;
}

/* dark problem band */
.band {
  width: 100%;
  color: #f7f4eb;
  background: var(--ink);
}

.band .section-kicker { color: var(--accent); }

.problem-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: clamp(50px, 10vw, 135px);
  align-items: center;
}

.band h2 { margin-bottom: 24px; }

.band p { color: color-mix(in srgb, #f7f4eb 68%, transparent); }

.quote {
  position: relative;
  margin: 0;
  padding: 38px;
  border: 1px solid color-mix(in srgb, #ffffff 13%, transparent);
  border-radius: 24px;
  background: color-mix(in srgb, #ffffff 4.5%, transparent);
  font-family: var(--serif);
  font-size: clamp(1.45rem, 2.8vw, 2.35rem);
  line-height: 1.25;
  letter-spacing: -0.02em;
}

.quote.lang-zh {
  font-family: inherit;
  font-weight: 700;
  line-height: 1.5;
  letter-spacing: 0;
}

.quote::before {
  position: absolute;
  top: -32px;
  left: 20px;
  color: var(--signal);
  content: "\201C";
  font-family: var(--serif);
  font-size: 6rem;
  line-height: 1;
}

/* numbered flow */
.flow-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.flow-grid.n3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.flow-grid.n2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }

.flow-card {
  position: relative;
  padding: 30px 28px 34px 0;
}

.flow-card + .flow-card {
  padding-left: 28px;
  border-left: 1px solid var(--line);
}

.flow-number {
  display: grid;
  width: 35px;
  height: 35px;
  margin-bottom: 30px;
  place-items: center;
  border-radius: 50%;
  color: #fff;
  background: var(--ink);
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 900;
}

.flow-card h3 {
  margin-bottom: 11px;
  font-size: 1.16rem;
  letter-spacing: -0.025em;
}

.flow-card p {
  margin-bottom: 0;
  color: var(--ink-soft);
  font-size: 0.92rem;
}

/* capability cards */
.tinted { background: color-mix(in srgb, var(--paper-strong) 64%, transparent); }

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 15px;
}

.card {
  min-height: 270px;
  padding: 29px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--paper-strong);
  transition: transform 180ms ease, box-shadow 180ms ease;
}

.card:hover {
  box-shadow: var(--shadow);
  transform: translateY(-4px);
}

.card-icon {
  display: grid;
  width: 46px;
  height: 46px;
  margin-bottom: 36px;
  place-items: center;
  border-radius: 13px;
  background: var(--accent);
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 950;
}

.card:nth-child(3n + 2) .card-icon { background: var(--accent-2); }
.card:nth-child(3n) .card-icon { background: color-mix(in srgb, var(--signal) 30%, var(--paper-strong)); }

.card h3 {
  margin-bottom: 10px;
  font-size: 1.2rem;
  letter-spacing: -0.03em;
}

.card p {
  margin-bottom: 0;
  color: var(--ink-soft);
  font-size: 0.92rem;
}

.card .tag {
  display: inline-block;
  margin-top: 16px;
  color: var(--kicker);
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 700;
}

/* showcase */
.showcase-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  align-items: start;
}

.showcase-grid.n2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.showcase-grid.n3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

/* architecture */
.arch-shell {
  display: grid;
  grid-template-columns: 1fr 0.82fr;
  gap: 16px;
}

.arch-map,
.principles {
  border-radius: 24px;
}

.arch-map {
  position: relative;
  overflow: hidden;
  min-height: 460px;
  padding: 38px;
  color: #fff;
  background: var(--ink);
}

.arch-map::after {
  position: absolute;
  right: -100px;
  bottom: -150px;
  width: 350px;
  height: 350px;
  border: 90px solid color-mix(in srgb, var(--accent) 8%, transparent);
  border-radius: 50%;
  content: "";
}

.map-label {
  margin-bottom: 36px;
  color: color-mix(in srgb, #ffffff 55%, transparent);
  font-size: 0.72rem;
  font-weight: 900;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.map-flow {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 0.8fr 36px 1fr 36px 0.8fr;
  align-items: center;
  gap: 8px;
}

.map-flow.n2 { grid-template-columns: 1fr 36px 1fr; }
.map-flow.n4 { grid-template-columns: 1fr 28px 1fr 28px 1fr 28px 1fr; }
.arch-shell.is-solo { grid-template-columns: 1fr; }

.map-node {
  min-height: 128px;
  padding: 18px;
  border: 1px solid color-mix(in srgb, #ffffff 14%, transparent);
  border-radius: 16px;
  background: color-mix(in srgb, #ffffff 5.5%, transparent);
}

.map-node.is-core {
  min-height: 200px;
  border-color: color-mix(in srgb, var(--accent) 50%, transparent);
  background: color-mix(in srgb, var(--accent) 9%, transparent);
}

.map-node strong {
  display: block;
  margin-bottom: 11px;
  font-size: 0.98rem;
  overflow-wrap: anywhere;
}

.map-node span {
  display: block;
  margin-top: 6px;
  color: color-mix(in srgb, #ffffff 58%, transparent);
  font-size: 0.74rem;
  line-height: 1.45;
}

.map-arrow {
  color: var(--accent);
  font-family: var(--mono);
  text-align: center;
}

.map-return {
  position: relative;
  z-index: 1;
  margin: 34px auto 0;
  padding-top: 20px;
  border-top: 1px dashed color-mix(in srgb, #ffffff 17%, transparent);
  color: color-mix(in srgb, #ffffff 62%, transparent);
  font-family: var(--mono);
  font-size: 0.72rem;
  text-align: center;
}

.principles {
  padding: 38px;
  background: var(--accent);
}

.principles h3 {
  max-width: 380px;
  margin-bottom: 30px;
  font-size: 1.9rem;
  line-height: 1.08;
  letter-spacing: -0.04em;
}

.principles h3.lang-zh { line-height: 1.3; letter-spacing: -0.01em; }

.tick-list {
  display: grid;
  margin: 0;
  padding: 0;
  list-style: none;
}

.tick-list li {
  display: grid;
  grid-template-columns: 23px 1fr;
  gap: 13px;
  padding: 16px 0;
  border-top: 1px solid color-mix(in srgb, var(--ink) 20%, transparent);
  font-size: 0.9rem;
  font-weight: 750;
}

.tick-list li::before {
  content: "\2713";
  font-weight: 950;
}

/* decisions */
.decision-list {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.decision {
  display: grid;
  grid-template-columns: 90px minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 30px;
  padding: 30px 0;
  border-bottom: 1px solid var(--line);
}

.decision-num {
  color: var(--kicker);
  font-family: var(--mono);
  font-size: 0.8rem;
  font-weight: 900;
}

.decision h3 {
  margin: 0;
  font-size: 1.35rem;
  line-height: 1.2;
  letter-spacing: -0.03em;
}

.decision p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.95rem;
}

/* quick start */
.dark-band {
  color: #fff;
  background: color-mix(in srgb, var(--ink) 92%, #1a2a26);
}

.dark-band .section-kicker { color: var(--accent); }

.qs-grid {
  display: grid;
  grid-template-columns: 0.75fr 1.25fr;
  gap: clamp(50px, 9vw, 110px);
  align-items: start;
}

/* let long code lines scroll inside their block instead of widening the grid */
.qs-grid > * { min-width: 0; }

.dark-band h2 { margin-bottom: 24px; }

.dark-band p { color: color-mix(in srgb, #ffffff 64%, transparent); }

.dark-band .button {
  border-color: color-mix(in srgb, #ffffff 50%, transparent);
  color: #fff;
  background: transparent;
  box-shadow: none;
}

.dark-band .button-primary {
  color: var(--ink);
  background: var(--accent);
  border-color: var(--accent);
}

.steps {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  counter-reset: setup;
}

.step {
  position: relative;
  padding: 24px 24px 24px 72px;
  border: 1px solid color-mix(in srgb, #ffffff 12%, transparent);
  border-radius: 16px;
  background: color-mix(in srgb, #ffffff 4.5%, transparent);
  counter-increment: setup;
}

.step::before {
  position: absolute;
  top: 22px;
  left: 24px;
  display: grid;
  width: 30px;
  height: 30px;
  place-items: center;
  border-radius: 50%;
  color: var(--ink);
  background: var(--accent);
  content: counter(setup);
  font-size: 0.72rem;
  font-weight: 950;
}

.step h3 {
  margin-bottom: 7px;
  font-size: 1rem;
}

.step p {
  margin-bottom: 10px;
  font-size: 0.88rem;
}

.step p:last-child { margin-bottom: 0; }

.code {
  position: relative;
  margin: 10px 0 0;
  padding: 14px 58px 14px 16px;
  overflow-x: auto;
  border-radius: 10px;
  color: var(--accent);
  background: color-mix(in srgb, #000000 28%, transparent);
  font-family: var(--mono);
  font-size: 0.8rem;
  line-height: 1.7;
  white-space: pre;
}

.copy {
  position: absolute;
  top: 8px;
  right: 8px;
  border: 1px solid color-mix(in srgb, #ffffff 22%, transparent);
  border-radius: 8px;
  padding: 4px 8px;
  color: color-mix(in srgb, #ffffff 80%, transparent);
  background: transparent;
  cursor: pointer;
  font: inherit;
  font-family: var(--mono);
  font-size: 0.68rem;
}

.copy .done { display: none; }
.copy.is-done .idle { display: none; }
.copy.is-done .done { display: inline; }

.code-wrap { position: relative; }

/* status + facts */
.status-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.status-col {
  padding: 32px;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: var(--paper-strong);
}

.status-col h3 {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 18px;
  font-size: 1.15rem;
}

.status-col h3::before {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #2f9e6d;
  content: "";
}

.status-col.is-limits h3::before { background: #e39a2d; }

.status-col ul {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.status-col li {
  padding: 12px 0;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 0.92rem;
}

.facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 0;
  margin: 40px 0 0;
  border-top: 1px solid var(--line);
}

.fact {
  padding: 20px 20px 20px 0;
  border-bottom: 1px solid var(--line);
}

.fact dt {
  margin-bottom: 6px;
  color: var(--ink-faint);
  font-size: 0.72rem;
  font-weight: 900;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.fact dd {
  margin: 0;
  font-size: 0.92rem;
  font-weight: 750;
  overflow-wrap: anywhere;
}

/* more by the author */
.more {
  padding: 60px 0;
  border-top: 1px solid var(--line);
}

.more-inner {
  width: min(calc(100% - 40px), var(--max));
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.more-inner p {
  max-width: 640px;
  margin: 0;
  color: var(--ink-soft);
}

.more-inner strong { color: var(--ink); }

/* ---------- footer ---------- */

.site-footer { border-top: 1px solid var(--line); }

.footer-inner {
  display: grid;
  /* a long row of links wraps instead of squeezing the brand column */
  grid-template-columns: minmax(16rem, 1fr) auto;
  align-items: end;
  gap: 30px;
  padding: 48px 0;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
  font-weight: 900;
}

.footer-brand img { width: 32px; height: 32px; }

.footer-inner p {
  margin-bottom: 0;
  color: var(--ink-soft);
  font-size: 0.8rem;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 18px;
  font-size: 0.82rem;
  font-weight: 800;
}

/* 404 */
.notfound {
  min-height: 70vh;
  display: grid;
  place-content: center;
  gap: 18px;
  padding: 60px 20px;
  text-align: center;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}

@media (max-width: 980px) {
  .menu-button { display: inline-flex; }

  .site-nav {
    position: absolute;
    top: 66px;
    right: 20px;
    display: none;
    width: min(330px, calc(100vw - 40px));
    align-items: stretch;
    padding: 18px;
    border: 1px solid var(--line);
    border-radius: 16px;
    background: var(--paper-strong);
    box-shadow: var(--shadow);
  }

  .site-nav.is-open { display: grid; }
  .site-nav a { padding: 6px 3px; }
  .language-switch, .github-link { width: max-content; }

  .hero {
    grid-template-columns: minmax(0, 1fr);
    padding-top: 76px;
  }

  .hero-copy { max-width: 760px; }

  .visual-wrap {
    width: min(100%, 600px);
    margin-inline: auto;
  }

  .section-heading,
  .problem-grid,
  .arch-shell,
  .qs-grid,
  .status-grid {
    grid-template-columns: 1fr;
  }

  .stats { grid-template-columns: repeat(2, minmax(0, 1fr)); margin-top: 0; }
  .stats:not(.n3) .stat:nth-child(3) { padding-left: 0; border-left: 0; }
  .stats:not(.n3) .stat:nth-child(n + 3) { border-top: 1px solid var(--line); }

  .flow-grid,
  .card-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .flow-grid:not(.n3) .flow-card:nth-child(3) { padding-left: 0; border-left: 0; }
  .flow-grid:not(.n3) .flow-card:nth-child(n + 3) { border-top: 1px solid var(--line); }

  .showcase-grid { grid-template-columns: 1fr; }
  .showcase-grid.n3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }

  .map-flow { grid-template-columns: 1fr !important; }
  .map-arrow { transform: rotate(90deg); }

  .decision { grid-template-columns: 70px 1fr; }
  .decision p { grid-column: 2; }
}

@media (max-width: 620px) {
  .header-inner,
  .hero,
  .section,
  .footer-inner,
  .stats,
  .more-inner {
    width: min(calc(100% - 28px), var(--max));
  }

  .header-inner { height: 66px; }

  .hero {
    min-height: 0;
    padding: 58px 0 64px;
    gap: 50px;
  }

  h1 { font-size: clamp(2.7rem, 13.5vw, 4.4rem); }
  .hero-copy h1.lang-zh { font-size: clamp(2.3rem, 11vw, 3.6rem); }

  .button-row, .button { width: 100%; }

  .visual-wrap { padding: 6px; }
  .panel-body { padding: 20px; }
  .check-side { display: none; }
  .panel-footer { margin: 20px -20px -20px; padding-inline: 20px; }

  .stats { grid-template-columns: 1fr 1fr; }
  .stats.n3 .stat { padding-right: 10px; }
  .stats.n3 .stat + .stat { padding-left: 12px; }
  .showcase-grid.n2,
  .showcase-grid.n3 { grid-template-columns: 1fr; }

  .section { padding: 72px 0; }

  .section-heading {
    gap: 22px;
    margin-bottom: 36px;
  }

  .quote { padding: 30px 24px; }

  .flow-grid,
  .flow-grid.n2,
  .flow-grid.n3,
  .card-grid {
    grid-template-columns: 1fr;
  }

  .flow-card,
  .flow-card + .flow-card {
    padding: 26px 0;
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .flow-card:first-child { border-top: 0; }
  .flow-number { margin-bottom: 16px; }

  .card { min-height: 0; }
  .card-icon { margin-bottom: 20px; }

  .arch-map, .principles, .status-col { padding: 26px; }

  .decision { grid-template-columns: 1fr; gap: 10px; }
  .decision p { grid-column: auto; }

  .step { padding: 64px 20px 22px; }
  .step::before { top: 20px; left: 20px; }

  .footer-inner {
    grid-template-columns: 1fr;
    align-items: start;
  }

  .footer-links { justify-content: flex-start; }
}

.fd {
  --fd-surface: #fcf9f9;
  --fd-edge: rgb(36 18 27 / 0.14);
  --fd-text: #24121b;
  --fd-faint: #897c81;
  --fd-accent: #d6006e;
  --fd-accent-ink: #8f074d;
  --fd-warn: #a3124f;
  --fd-info: #666676;
  --fd-font: inherit;
  --fd-mono: var(--mono);
}