:root {
  --bg: #060606;
  --bg-soft: #0e0f10;
  --panel: rgba(17, 18, 20, 0.9);
  --panel-strong: #17191d;
  --line: rgba(255,255,255,0.08);
  --line-strong: rgba(255,255,255,0.12);
  --text: #f3efe9;
  --muted: #a9a49d;
  --muted-strong: #d3d0ca;
  --accent: #d9c9aa;
  --accent-soft: rgba(217, 201, 170, 0.12);
  --shadow: 0 22px 48px rgba(0, 0, 0, 0.45);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at top, rgba(217, 201, 170, 0.14), transparent 30%),
    linear-gradient(180deg, #050505 0%, #0a0b0d 100%);
  font: 13px/1.6 "Segoe UI", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}
button, a { font: inherit; }
button { cursor: pointer; }
a { text-decoration: none; color: inherit; }

.topbar {
  height: 64px;
  padding: 0 4vw;
  display: flex;
  align-items: center;
  gap: 26px;
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  background: rgba(7, 7, 8, 0.82);
  backdrop-filter: blur(12px);
  z-index: 30;
}
.brand {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.04em;
  white-space: nowrap;
}
.brand span { color: var(--accent); }
nav {
  display: flex;
  gap: 4px;
  flex: 1;
}
nav button {
  border: 0;
  background: transparent;
  padding: 21px 12px 18px;
  border-bottom: 2px solid transparent;
  font-size: 11px;
  letter-spacing: 0.02em;
  color: var(--muted);
  transition: color 160ms ease, border-color 160ms ease, background 160ms ease;
}
nav button:hover { color: var(--text); }
nav button.active {
  color: var(--text);
  border-bottom-color: var(--accent);
  font-weight: 700;
}
.version {
  font-size: 9px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  border: 1px solid var(--line);
  padding: 5px 10px;
  border-radius: 999px;
  color: var(--muted);
  background: rgba(255,255,255,0.01);
}

main { min-height: calc(100vh - 100px); }
.page {
  display: none;
  max-width: 1380px;
  margin: 0 auto;
  padding: 62px 5vw 90px;
}
.page.active { display: block; }
.eyebrow {
  font-size: 9px;
  letter-spacing: 0.18em;
  color: var(--accent);
  font-weight: 800;
  text-transform: uppercase;
}
.hero { padding: 36px 0 18px; }
.hero h1,
.method-head h1,
.placeholder h1 {
  font: 400 clamp(42px, 5vw, 74px)/1 Georgia, "Times New Roman", serif;
  letter-spacing: -0.05em;
  margin: 18px 0 22px;
  color: var(--text);
}
.hero h1 span { color: var(--accent); }
.lead {
  max-width: 760px;
  color: var(--muted);
  font-size: 15px;
  letter-spacing: 0.01em;
}
.hero-rule {
  margin-top: 46px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  display: flex;
  align-items: center;
  gap: 24px;
  color: var(--muted-strong);
}
.hero-rule strong {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--accent);
}
.hero-rule span {
  font: 20px Georgia, "Times New Roman", serif;
  color: var(--text);
}

.method-head {
  display: grid;
  grid-template-columns: 1.4fr 0.6fr;
  gap: 52px;
  padding-bottom: 34px;
  border-bottom: 1px solid var(--line);
  align-items: end;
}
.method-head h1 { font-size: clamp(34px, 4vw, 54px); }
.principle-card {
  background: linear-gradient(180deg, rgba(255,255,255,0.02), rgba(217,201,170,0.04));
  border: 1px solid var(--line);
  border-left: 2px solid var(--accent);
  border-radius: 18px;
  padding: 18px 18px 16px;
  box-shadow: var(--shadow);
}
.principle-card small {
  display: block;
  font-size: 9px;
  letter-spacing: 0.18em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 18px;
}
.principle-card strong {
  display: block;
  font-size: 19px;
  line-height: 1.3;
  margin-bottom: 10px;
  color: var(--text);
}
.principle-card p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}

.method-layout {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 32px;
  align-items: start;
  margin-top: 28px;
}
.method-nav {
  position: sticky;
  top: 82px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.method-nav button {
  width: 100%;
  background: rgba(255,255,255,0.02);
  border: 1px solid var(--line);
  color: var(--muted);
  padding: 12px 14px;
  border-radius: 999px;
  text-align: left;
  transition: 160ms ease;
}
.method-nav button.active {
  border-color: var(--line-strong);
  background: rgba(217, 201, 170, 0.05);
  color: var(--text);
}
.method-content {
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.method-section {
  background: rgba(255,255,255,0.012);
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 30px 28px 26px;
  box-shadow: var(--shadow);
}
.section-no {
  margin: 0 0 16px;
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--accent);
  font-weight: 700;
}
.method-section h2 {
  margin: 0 0 14px;
  font: 400 clamp(25px, 2vw, 38px)/1.1 Georgia, "Times New Roman", serif;
  letter-spacing: -0.04em;
  color: var(--text);
}
.method-section p {
  margin: 0 0 18px;
  color: var(--muted);
  max-width: 72ch;
  font-size: 14px;
}
.method-section strong {
  color: var(--muted-strong);
}
blockquote {
  margin: 22px 0 18px;
  padding-left: 18px;
  border-left: 1px solid var(--accent);
  color: var(--text);
  font: 400 18px/1.5 Georgia, "Times New Roman", serif;
  letter-spacing: -0.03em;
}

.principles-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 28px;
}
.principles-grid div {
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: rgba(255,255,255,0.018);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 16px 16px 15px;
}
.principles-grid b {
  font-size: 14px;
  color: var(--text);
}
.principles-grid span {
  color: var(--muted);
  font-size: 13px;
}

.example {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  margin-top: 18px;
  padding: 18px 18px 16px;
  background: linear-gradient(180deg, rgba(255,255,255,0.01), rgba(217,201,170,0.03));
  border-radius: 16px;
  border: 1px solid var(--line);
}
.example span {
  color: var(--accent);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  font-weight: 700;
}
.example strong {
  font-size: 18px;
  color: var(--text);
  letter-spacing: -0.03em;
}
.example p {
  margin: 0;
}

.request-flow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: 18px;
  color: var(--muted);
}
.request-flow span {
  background: rgba(255,255,255,0.02);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 8px 12px;
  font-size: 12px;
}
.request-flow i {
  color: var(--accent);
  font-style: normal;
  opacity: 0.8;
}

.loop-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-top: 10px;
}
.loop-step {
  background: rgba(255,255,255,0.018);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 18px 18px 16px;
}
.loop-step h3 {
  margin: 14px 0 8px;
  color: var(--text);
  font-size: 18px;
  letter-spacing: -0.03em;
}
.loop-step p {
  margin: 0 0 10px;
  color: var(--muted);
  font-size: 13px;
}
.loop-step small {
  color: var(--accent);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 34px;
  height: 28px;
  padding: 0 8px;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--accent);
  font-size: 10px;
  letter-spacing: 0.1em;
  font-weight: 700;
}

.doc-track {
  display: grid;
  grid-template-columns: repeat(10, minmax(0, 1fr));
  gap: 7px;
  margin-top: 18px;
}
.doc-phase {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 30px;
  padding: 0 4px;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--muted);
  font-size: 9px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: rgba(255,255,255,0.012);
}
.doc-phase.active {
  background: rgba(217, 201, 170, 0.08);
  border-color: rgba(217, 201, 170, 0.2);
  color: var(--text);
}
.doc-phase.muted { opacity: 0.55; }
.track-label {
  margin-top: 12px;
  color: var(--accent);
  font-size: 9px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.doc-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-top: 20px;
}
.doc-grid article {
  background: rgba(255,255,255,0.018);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 16px 16px 14px;
}
.doc-grid small {
  color: var(--accent);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  font-size: 9px;
}
.doc-grid h3 {
  margin: 10px 0 8px;
  color: var(--text);
  font-size: 18px;
  letter-spacing: -0.02em;
}
.doc-grid p {
  margin: 0;
}

.gate-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-top: 18px;
}
.gate-grid div {
  background: rgba(255,255,255,0.018);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 16px 16px 14px;
}
.gate-grid span {
  display: inline-block;
  color: var(--accent);
  margin-bottom: 10px;
  font-size: 9px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}
.gate-grid b {
  display: block;
  color: var(--text);
  font-size: 18px;
  margin-bottom: 8px;
  letter-spacing: -0.03em;
}
.gate-grid p { margin: 0; }

.output-table {
  margin-top: 14px;
  border: 1px solid var(--line);
  border-radius: 16px;
  overflow: hidden;
}
.row {
  display: grid;
  grid-template-columns: 1fr 1.1fr 1.2fr;
  gap: 12px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
  background: rgba(255,255,255,0.01);
}
.row:last-child { border-bottom: 0; }
.row.head {
  background: rgba(217, 201, 170, 0.05);
  color: var(--text);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.row:not(.head) span:first-child {
  color: var(--text);
  font-weight: 600;
}
.row span {
  color: var(--muted);
  font-size: 13px;
}

.placeholder {
  padding-top: 100px;
  min-height: 40vh;
}
.placeholder h1 {
  margin-bottom: 16px;
}
.placeholder p {
  margin: 0;
  color: var(--muted);
  max-width: 620px;
}

footer {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 5vw 34px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 12px;
  background: rgba(0,0,0,0.08);
}

@media (max-width: 980px) {
  .method-head,
  .method-layout {
    grid-template-columns: 1fr;
  }
  .method-nav {
    position: static;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .loop-grid,
  .doc-grid,
  .gate-grid,
  .principles-grid {
    grid-template-columns: 1fr 1fr;
  }
  .doc-track {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .topbar {
    gap: 12px;
    padding: 0 18px;
  }
  nav {
    gap: 0;
    overflow-x: auto;
    scrollbar-width: none;
  }
  nav::-webkit-scrollbar { display: none; }
  nav button {
    white-space: nowrap;
    padding-left: 10px;
    padding-right: 10px;
  }
  .page { padding-left: 20px; padding-right: 20px; }
  .loop-grid,
  .doc-grid,
  .gate-grid,
  .principles-grid,
  .method-nav {
    grid-template-columns: 1fr;
  }
  .row {
    grid-template-columns: 1fr;
  }
  .hero-rule,
  footer {
    display: block;
  }
  footer span + span { margin-top: 8px; display: block; }
}