:root {
  color-scheme: light;
  --paper: #f7f3eb;
  --surface: #fffdf8;
  --ink: #202a30;
  --ink-soft: #5d6668;
  --line: #d8d0c3;
  --brand: #754226;
  --teal: #176b75;
  --sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --serif: "Songti SC", "STSong", "Noto Serif CJK SC", Georgia, serif;
}

* { box-sizing: border-box; }

html {
  background: var(--paper);
  font-family: var(--sans);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body {
  min-width: 320px;
  margin: 0;
  color: var(--ink);
  background-color: var(--paper);
  background-image:
    linear-gradient(rgba(117, 66, 38, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(117, 66, 38, 0.045) 1px, transparent 1px);
  background-size: 36px 36px;
}

a { color: inherit; text-decoration: none; }

.page-shell {
  width: min(1180px, calc(100% - 48px));
  min-height: 100vh;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
}

.site-header {
  min-height: 104px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  border-bottom: 1px solid var(--line);
}

.brand { display: inline-flex; align-items: center; gap: 13px; }
.brand img { display: block; border-radius: 10px; box-shadow: 0 5px 18px rgba(88, 49, 29, 0.14); }
.brand-copy { display: grid; gap: 2px; }
.brand-copy strong { font-family: var(--serif); font-size: 20px; letter-spacing: 0.08em; }
.brand-copy span { color: var(--ink-soft); font-size: 10px; font-weight: 700; letter-spacing: 0.22em; }

.build-status {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 253, 248, 0.68);
  color: var(--ink-soft);
  font-size: 12px;
  font-weight: 650;
  letter-spacing: 0.06em;
}

.build-status span {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--teal);
  box-shadow: 0 0 0 5px rgba(23, 107, 117, 0.1);
  animation: breathe 2.4s ease-in-out infinite;
}

main { flex: 1; }

.hero {
  min-height: 590px;
  display: grid;
  grid-template-columns: minmax(0, 1.22fr) minmax(330px, 0.78fr);
  gap: clamp(54px, 8vw, 108px);
  align-items: center;
  padding: 80px 0 88px;
}

.eyebrow {
  margin: 0 0 22px;
  color: var(--brand);
  font-size: 12px;
  font-weight: 750;
  letter-spacing: 0.2em;
}

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

h1 {
  max-width: 760px;
  margin-bottom: 30px;
  font-family: var(--serif);
  font-size: clamp(44px, 6.2vw, 78px);
  font-weight: 700;
  line-height: 1.14;
  letter-spacing: -0.035em;
}

h1 em { display: block; color: var(--brand); font-style: normal; }

.hero-lead {
  max-width: 680px;
  margin-bottom: 34px;
  color: var(--ink-soft);
  font-size: clamp(16px, 1.7vw, 19px);
  line-height: 1.9;
}

.launch-note {
  width: fit-content;
  max-width: 100%;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 11px 15px;
  border-left: 3px solid var(--teal);
  background: rgba(255, 253, 248, 0.66);
  color: var(--ink-soft);
  font-size: 13px;
  line-height: 1.6;
}

.launch-label { flex: none; color: var(--teal); font-weight: 750; }

.signal-board {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255, 253, 248, 0.86);
  box-shadow: 0 24px 70px rgba(88, 49, 29, 0.08);
}

.signal-board::before { content: ""; position: absolute; inset: 0 auto 0 0; width: 4px; background: var(--brand); }

.signal-head {
  display: flex;
  justify-content: space-between;
  padding: 19px 22px 17px 25px;
  border-bottom: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 11px;
  font-weight: 750;
  letter-spacing: 0.16em;
}

.signal-board ol { margin: 0; padding: 0; list-style: none; }
.signal-board li {
  min-height: 96px;
  display: grid;
  grid-template-columns: 38px 1fr;
  align-content: center;
  padding: 18px 24px 18px 25px;
  border-bottom: 1px solid var(--line);
}
.signal-board li:last-child { border-bottom: 0; }
.signal-board li > span {
  grid-row: 1 / 3;
  align-self: start;
  padding-top: 2px;
  color: var(--brand);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 11px;
}
.signal-board strong { margin-bottom: 5px; font-family: var(--serif); font-size: 17px; letter-spacing: 0.025em; }
.signal-board small { color: var(--ink-soft); font-size: 12px; line-height: 1.5; }

.principles { padding: 74px 0 82px; border-top: 1px solid var(--line); }
.section-intro {
  display: grid;
  grid-template-columns: 1fr 2fr;
  align-items: end;
  gap: 24px;
  margin-bottom: 36px;
}
.section-intro .eyebrow { margin: 0 0 7px; }
h2 { margin-bottom: 0; font-family: var(--serif); font-size: clamp(30px, 4vw, 46px); line-height: 1.25; }

.principle-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.principle-grid article {
  min-height: 230px;
  padding: 31px 30px 28px;
  border-right: 1px solid var(--line);
  background: rgba(255, 253, 248, 0.42);
}
.principle-grid article:first-child { padding-left: 0; background: transparent; }
.principle-grid article:last-child { padding-right: 0; border-right: 0; background: transparent; }
.principle-index {
  display: inline-grid;
  width: 28px;
  height: 28px;
  margin-bottom: 32px;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 50%;
  color: var(--brand);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 11px;
}
h3 { margin-bottom: 12px; font-family: var(--serif); font-size: 21px; }
.principle-grid p { margin-bottom: 0; color: var(--ink-soft); font-size: 14px; line-height: 1.8; }

footer {
  min-height: 116px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 28px 0;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 12px;
}
footer p { margin: 0; }
footer strong { margin-right: 12px; color: var(--ink); font-family: var(--serif); font-size: 15px; }
.footer-meta { text-align: right; letter-spacing: 0.04em; }

.error-page {
  width: min(680px, calc(100% - 40px));
  min-height: 100vh;
  margin: 0 auto;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  flex-direction: column;
}
.error-page img { margin-bottom: 38px; border-radius: 12px; }
.error-page h1 { margin-bottom: 18px; font-size: clamp(42px, 8vw, 68px); }
.error-page > p:not(.eyebrow) { margin-bottom: 28px; color: var(--ink-soft); font-size: 16px; }
.error-page a { padding-bottom: 4px; border-bottom: 1px solid var(--brand); color: var(--brand); font-weight: 700; }

@keyframes breathe {
  0%, 100% { box-shadow: 0 0 0 5px rgba(23, 107, 117, 0.08); }
  50% { box-shadow: 0 0 0 8px rgba(23, 107, 117, 0.03); }
}

@media (max-width: 860px) {
  .page-shell { width: min(100% - 36px, 680px); }
  .hero { min-height: auto; grid-template-columns: 1fr; gap: 54px; padding: 68px 0 72px; }
  h1 { max-width: 640px; }
  .signal-board { max-width: 600px; }
  .section-intro { grid-template-columns: 1fr; }
  .principle-grid { grid-template-columns: 1fr; }
  .principle-grid article,
  .principle-grid article:first-child,
  .principle-grid article:last-child {
    min-height: auto;
    padding: 28px 0;
    border-right: 0;
    border-bottom: 1px solid var(--line);
    background: transparent;
  }
  .principle-grid article:last-child { border-bottom: 0; }
  .principle-index { margin-bottom: 20px; }
}

@media (max-width: 560px) {
  .page-shell { width: calc(100% - 32px); }
  .site-header { min-height: 88px; }
  .brand img { width: 38px; height: 38px; }
  .brand-copy strong { font-size: 18px; }
  .build-status { padding: 7px 10px; font-size: 11px; }
  .hero { gap: 42px; padding: 54px 0 62px; }
  .eyebrow { margin-bottom: 18px; }
  h1 { margin-bottom: 24px; font-size: clamp(40px, 13vw, 56px); }
  .hero-lead { font-size: 16px; line-height: 1.8; }
  .launch-note { align-items: flex-start; flex-direction: column; gap: 4px; }
  .signal-board li { padding-right: 17px; padding-left: 20px; }
  .principles { padding: 58px 0 64px; }
  footer { align-items: flex-start; flex-direction: column; }
  .footer-meta { text-align: left; }
}

@media (prefers-reduced-motion: reduce) {
  .build-status span { animation: none; }
}