/* =========================================================
   观复智策
   Operating Intelligence — website stylesheet
   ========================================================= */

/* ---------- 1. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body, h1, h2, h3, h4, p, figure, blockquote, dl, dd, ul, ol { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }

/* ---------- 2. Tokens ---------- */
:root {
  --c-ink:        #0E1512;
  --c-ink-soft:   #17211C;
  --c-jade:       #2B4438;
  --c-jade-mid:   #3D5C4C;
  --c-copper:     #A9713C;
  --c-copper-deep:#8A5A2B;
  --c-copper-lite:#C89A62;
  --c-paper:      #FAF8F3;
  --c-paper-warm: #F2EDE2;
  --c-paper-deep: #E9E2D2;
  --c-muted:      #6E6B62;
  --c-muted-lite: #918D82;

  --line:      rgba(14, 21, 18, 0.10);
  --line-mid:  rgba(14, 21, 18, 0.18);
  --line-bold: rgba(14, 21, 18, 0.34);
  --line-dark: rgba(250, 248, 243, 0.14);
  --line-dark-mid: rgba(250, 248, 243, 0.24);

  --font-serif: "Songti SC", "Source Han Serif SC", "Noto Serif CJK SC", "STSong", "SimSun", Georgia, "Times New Roman", serif;
  --font-sans:  "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;

  --container: 1200px;
  --gutter: 32px;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

/* ---------- 3. Base ---------- */
body {
  background: var(--c-paper);
  color: var(--c-ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

::selection { background: var(--c-copper); color: #fff; }

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.container--narrow { max-width: 880px; }

.section { padding-block: 128px; position: relative; }
.section--tight { padding-block: 88px; }
.section--paper { background: var(--c-paper); }
.section--warm  { background: var(--c-paper-warm); }
.section--ink   { background: var(--c-ink); color: var(--c-paper); }
.section--ink .lead { color: rgba(250, 248, 243, 0.62); }
.section--ink .h2   { color: var(--c-paper); }

/* ---------- 4. Typography ---------- */
h1, h2, h3, h4, .serif { font-family: var(--font-serif); font-weight: 400; }

.h1 {
  font-family: var(--font-serif);
  font-size: clamp(34px, 4.6vw, 62px);
  line-height: 1.34;
  letter-spacing: 0.01em;
}
.h2 {
  font-family: var(--font-serif);
  font-size: clamp(26px, 3.2vw, 42px);
  line-height: 1.42;
  letter-spacing: 0.01em;
}
.h3 {
  font-family: var(--font-serif);
  font-size: clamp(19px, 1.7vw, 24px);
  line-height: 1.5;
}
.h4 {
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 500;
  line-height: 1.6;
}

.lead {
  font-size: 17px;
  line-height: 1.95;
  color: var(--c-muted);
  font-weight: 400;
}
.body-sm { font-size: 14.5px; line-height: 1.85; color: var(--c-muted); }
.body-xs { font-size: 13px; line-height: 1.8; color: var(--c-muted-lite); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--c-copper);
  margin-bottom: 26px;
}
.eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background: currentColor;
  flex: none;
}
.section--ink .eyebrow { color: var(--c-copper-lite); }

.section-head { max-width: 780px; margin-bottom: 68px; }
.section-head .lead { margin-top: 24px; max-width: 660px; }

.hl { color: var(--c-copper-deep); }
.section--ink .hl { color: var(--c-copper-lite); }

/* ---------- 5. Navigation ---------- */
.nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  padding-block: 22px;
  transition: background 0.45s var(--ease), padding 0.45s var(--ease), border-color 0.45s var(--ease);
  border-bottom: 1px solid transparent;
}
.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}
.nav.is-scrolled {
  padding-block: 14px;
  background: rgba(250, 248, 243, 0.92);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  backdrop-filter: saturate(180%) blur(14px);
  border-bottom-color: var(--line);
}
.nav.on-dark { color: var(--c-paper); }
.nav.on-dark.is-scrolled { color: var(--c-ink); }

.brand { display: flex; align-items: center; gap: 12px; flex: none; }
.brand__mark {
  width: 26px; height: 26px;
  border: 1px solid currentColor;
  display: grid;
  place-items: center;
  font-family: var(--font-serif);
  font-size: 13px;
  line-height: 1;
  opacity: 0.9;
}
.brand__text { display: flex; flex-direction: column; line-height: 1.1; }
.brand__cn {
  font-family: var(--font-serif);
  font-size: 19px;
  letter-spacing: 0.14em;
}
.brand__en {
  font-size: 9px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  opacity: 0.55;
  margin-top: 4px;
}

.nav__links { display: flex; align-items: center; gap: 34px; }
.nav__link {
  font-size: 14px;
  letter-spacing: 0.04em;
  opacity: 0.72;
  transition: opacity 0.3s, color 0.3s;
  position: relative;
  padding-block: 4px;
}
.nav__link:hover { opacity: 1; }
.nav__link.is-active { opacity: 1; color: var(--c-copper-deep); }
.nav.on-dark .nav__link.is-active { color: var(--c-copper-lite); }
.nav__link.is-active::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -2px;
  height: 1px;
  background: currentColor;
  opacity: 0.6;
}
.nav__cta {
  flex: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13.5px;
  letter-spacing: 0.06em;
  padding: 11px 20px;
  border: 1px solid currentColor;
  transition: background 0.35s, color 0.35s, border-color 0.35s;
}
.nav__cta:hover { background: var(--c-copper-deep); border-color: var(--c-copper-deep); color: #fff; }

.nav__toggle {
  display: none;
  width: 40px; height: 40px;
  align-items: center;
  justify-content: center;
  border: 1px solid currentColor;
  opacity: 0.8;
}
.nav__toggle span {
  display: block;
  width: 16px; height: 1px;
  background: currentColor;
  position: relative;
}
.nav__toggle span::before,
.nav__toggle span::after {
  content: "";
  position: absolute; left: 0;
  width: 16px; height: 1px;
  background: currentColor;
}
.nav__toggle span::before { top: -5px; }
.nav__toggle span::after  { top: 5px; }

/* ---------- 6. Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 15px 28px;
  font-size: 14px;
  letter-spacing: 0.06em;
  border: 1px solid transparent;
  transition: background 0.4s var(--ease), color 0.4s var(--ease), border-color 0.4s var(--ease), transform 0.4s var(--ease);
  text-align: center;
}
.btn__arrow { display: inline-block; transition: transform 0.4s var(--ease); }
.btn:hover .btn__arrow { transform: translateX(4px); }

.btn--solid { background: var(--c-copper-deep); color: #fff; border-color: var(--c-copper-deep); }
.btn--solid:hover { background: var(--c-ink); border-color: var(--c-ink); }
.btn--line { border-color: var(--line-bold); color: var(--c-ink); }
.btn--line:hover { border-color: var(--c-ink); background: var(--c-ink); color: var(--c-paper); }
.btn--ghost { border-color: var(--line-dark-mid); color: var(--c-paper); }
.btn--ghost:hover { background: var(--c-paper); color: var(--c-ink); border-color: var(--c-paper); }

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--c-copper-deep);
  border-bottom: 1px solid currentColor;
  padding-bottom: 3px;
  transition: gap 0.35s var(--ease), opacity 0.3s;
}
.link-arrow:hover { gap: 14px; }
.section--ink .link-arrow { color: var(--c-copper-lite); }

/* ---------- 7. Hero ---------- */
.hero {
  position: relative;
  background: var(--c-ink);
  color: var(--c-paper);
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-top: 168px;
  padding-bottom: 124px;
  overflow: hidden;
}
.hero__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(250, 248, 243, 0.048) 1px, transparent 1px),
    linear-gradient(90deg, rgba(250, 248, 243, 0.048) 1px, transparent 1px);
  background-size: 80px 80px;
  background-position: center top;
  pointer-events: none;
  -webkit-mask-image: radial-gradient(ellipse 90% 70% at 50% 32%, #000 35%, transparent 100%);
  mask-image: radial-gradient(ellipse 90% 70% at 50% 32%, #000 35%, transparent 100%);
}
.hero__glow {
  position: absolute;
  width: 780px; height: 780px;
  right: -220px; top: -280px;
  background: radial-gradient(circle, rgba(169, 113, 60, 0.20) 0%, transparent 62%);
  pointer-events: none;
}
.hero__inner { position: relative; z-index: 2; }

.hero__tagline {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: rgba(250, 248, 243, 0.55);
  margin-bottom: 40px;
}
.hero__tagline::before {
  content: "";
  width: 34px; height: 1px;
  background: var(--c-copper-lite);
}

.hero__title {
  font-family: var(--font-serif);
  font-size: clamp(36px, 5.4vw, 72px);
  line-height: 1.32;
  letter-spacing: 0.02em;
  max-width: 15em;
}
.hero__title em {
  font-style: normal;
  color: var(--c-copper-lite);
  position: relative;
}
.hero__sub {
  margin-top: 38px;
  max-width: 600px;
  font-size: 16.5px;
  line-height: 2;
  color: rgba(250, 248, 243, 0.6);
}
.hero__actions { margin-top: 48px; display: flex; flex-wrap: wrap; gap: 16px; }

.hero__verse {
  position: absolute;
  right: 48px;
  top: 96px;
  writing-mode: vertical-rl;
  font-family: var(--font-serif);
  font-size: 15px;
  letter-spacing: 0.5em;
  color: rgba(250, 248, 243, 0.22);
  z-index: 2;
}

.hero__stats {
  position: relative;
  z-index: 2;
  margin-top: 104px;
  border-top: 1px solid var(--line-dark);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}
.hero__stat {
  padding: 34px 28px 38px;
  border-right: 1px solid var(--line-dark);
}
.hero__stat:last-child { border-right: 0; }
.hero__stat-num {
  font-family: var(--font-serif);
  font-size: clamp(26px, 2.6vw, 36px);
  line-height: 1.2;
  color: var(--c-copper-lite);
  letter-spacing: 0.01em;
}
.hero__stat-label {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.6;
  color: rgba(250, 248, 243, 0.5);
}
.hero__stat-note {
  display: block;
  margin-top: 6px;
  font-size: 10.5px;
  letter-spacing: 0.06em;
  color: rgba(250, 248, 243, 0.3);
}

/* ---------- 8. Grids ---------- */
.grid { display: grid; gap: 40px; }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid--gap-sm { gap: 24px; }
.grid--gap-lg { gap: 64px; }

/* ---------- 9. Numbered question cards ---------- */
.qcard {
  position: relative;
  padding-top: 30px;
  border-top: 1px solid var(--line-mid);
}
.qcard__num {
  font-family: var(--font-serif);
  font-size: 13px;
  letter-spacing: 0.2em;
  color: var(--c-copper);
  display: block;
  margin-bottom: 22px;
}
.qcard__title {
  font-family: var(--font-serif);
  font-size: 21px;
  line-height: 1.55;
  margin-bottom: 14px;
}
.qcard__body { font-size: 14px; line-height: 1.85; color: var(--c-muted); }

/* ---------- 10. Split block ---------- */
.split {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 80px;
  align-items: start;
}
.split--rev { grid-template-columns: 1.1fr 0.9fr; }

/* ---------- 11. Three-layer diagram ---------- */
.layers { display: grid; gap: 0; margin-top: 12px; }
.layer {
  display: grid;
  grid-template-columns: 132px 1fr;
  gap: 28px;
  align-items: baseline;
  padding-block: 26px;
  border-top: 1px solid var(--line-dark);
}
.layer:last-child { border-bottom: 1px solid var(--line-dark); }
.layer__tag {
  font-family: var(--font-serif);
  font-size: 15px;
  letter-spacing: 0.12em;
  color: var(--c-copper-lite);
}
.layer__body { font-size: 14.5px; line-height: 1.85; color: rgba(250, 248, 243, 0.6); }
.layer__body strong { color: var(--c-paper); font-weight: 500; display: block; margin-bottom: 4px; font-size: 15.5px; }

/* ---------- 12. Ladder ---------- */
.ladder { display: grid; gap: 2px; }
.rung {
  display: grid;
  grid-template-columns: 96px 1fr 1.05fr;
  gap: 32px;
  align-items: center;
  padding: 30px 34px;
  background: var(--c-paper);
  border: 1px solid var(--line);
  transition: background 0.4s var(--ease), border-color 0.4s var(--ease), transform 0.4s var(--ease);
}
.rung:hover { background: #fff; border-color: var(--line-mid); transform: translateX(6px); }
.rung__lv {
  font-family: var(--font-serif);
  font-size: 22px;
  color: var(--c-copper);
  letter-spacing: 0.04em;
}
.rung__name { font-family: var(--font-serif); font-size: 22px; line-height: 1.4; }
.rung__name small { display: block; font-family: var(--font-sans); font-size: 13px; color: var(--c-muted-lite); letter-spacing: 0.04em; margin-top: 6px; }
.rung__desc { font-size: 14px; line-height: 1.85; color: var(--c-muted); }
.rung--hl { background: var(--c-ink); border-color: var(--c-ink); }
.rung--hl .rung__name { color: var(--c-paper); }
.rung--hl .rung__name small { color: rgba(250,248,243,.45); }
.rung--hl .rung__desc { color: rgba(250, 248, 243, 0.6); }
.rung--hl .rung__lv { color: var(--c-copper-lite); }

/* ---------- 13. Path columns ---------- */
.path {
  padding: 44px 40px 48px;
  border: 1px solid var(--line);
  background: var(--c-paper);
  position: relative;
  transition: border-color 0.4s, box-shadow 0.5s var(--ease);
}
.path:hover { border-color: var(--line-mid); box-shadow: 0 24px 60px -40px rgba(14,21,18,.4); }
.path__label {
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--c-copper);
  margin-bottom: 20px;
}
.path__title { font-family: var(--font-serif); font-size: 26px; margin-bottom: 8px; }
.path__sub { font-size: 13.5px; color: var(--c-muted); margin-bottom: 30px; }
.flow { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-bottom: 30px; }
.flow__node {
  font-size: 12.5px;
  letter-spacing: 0.04em;
  padding: 6px 11px;
  border: 1px solid var(--line-mid);
  color: var(--c-ink);
  background: var(--c-paper-warm);
}
.flow__sep { color: var(--c-muted-lite); font-size: 12px; }
.path__list { display: grid; gap: 12px; }
.path__list li {
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-muted);
  padding-left: 18px;
  position: relative;
}
.path__list li::before {
  content: "";
  position: absolute;
  left: 0; top: 11px;
  width: 5px; height: 1px;
  background: var(--c-copper);
}

/* ---------- 14. Capability triad ---------- */
.triad {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--line-dark);
}
.triad__item {
  padding: 40px 34px 44px;
  border-right: 1px solid var(--line-dark);
  border-bottom: 1px solid var(--line-dark);
}
.triad__item:last-child { border-right: 0; }
.triad__num {
  font-family: var(--font-serif);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--c-copper-lite);
  display: block;
  margin-bottom: 26px;
}
.triad__title { font-family: var(--font-serif); font-size: 23px; color: var(--c-paper); margin-bottom: 10px; }
.triad__role { font-size: 13px; letter-spacing: 0.06em; color: var(--c-copper-lite); margin-bottom: 22px; }
.triad__list { display: grid; gap: 9px; }
.triad__list li { font-size: 13.5px; line-height: 1.75; color: rgba(250, 248, 243, 0.55); }

/* ---------- 15. Case cards ---------- */
.case {
  display: grid;
  grid-template-columns: 322px 1fr;
  gap: 56px;
  padding-block: 56px;
  border-top: 1px solid var(--line);
  transition: background 0.4s;
}
.case:last-of-type { border-bottom: 1px solid var(--line); }
.case__side { position: sticky; top: 120px; align-self: start; }
.case__tag {
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--c-copper);
  margin-bottom: 16px;
  display: block;
}
.case__title { font-family: var(--font-serif); font-size: 25px; line-height: 1.5; margin-bottom: 14px; text-wrap: balance; }
.case__meta { font-size: 13px; line-height: 1.8; color: var(--c-muted-lite); }
.case__body { display: grid; gap: 30px; }
.case__block { display: grid; grid-template-columns: 120px 1fr; gap: 28px; }
.case__block dt {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--c-copper);
  padding-top: 4px;
}
.case__block dd { font-size: 15px; line-height: 1.9; color: var(--c-muted); }
.case__block dd strong { color: var(--c-ink); font-weight: 500; }
.case__result {
  display: flex;
  flex-wrap: wrap;
  gap: 40px;
  padding: 26px 30px;
  background: var(--c-paper-warm);
  border-left: 2px solid var(--c-copper);
}
.case__result-item strong {
  display: block;
  font-family: var(--font-serif);
  font-size: 28px;
  color: var(--c-copper-deep);
  line-height: 1.2;
}
.case__result-item span { font-size: 12px; color: var(--c-muted); letter-spacing: 0.04em; }

/* ---------- 16. Service steps ---------- */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; border-top: 1px solid var(--line-mid); }
.step {
  padding: 36px 28px 40px 0;
  border-right: 1px solid var(--line);
  padding-right: 28px;
  transition: background 0.4s;
}
.step:last-child { border-right: 0; }
.step__idx {
  font-family: var(--font-serif);
  font-size: 13px;
  color: var(--c-copper);
  letter-spacing: 0.16em;
  display: block;
  margin-bottom: 28px;
}
.step__title { font-family: var(--font-serif); font-size: 24px; margin-bottom: 12px; }
.step__desc { font-size: 14px; line-height: 1.85; color: var(--c-muted); }
.step__out {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px dashed var(--line-mid);
  font-size: 12.5px;
  color: var(--c-muted-lite);
  line-height: 1.7;
}
.step__out b { color: var(--c-ink); font-weight: 500; }

/* ---------- 17. Quote / statement ---------- */
.statement {
  font-family: var(--font-serif);
  font-size: clamp(24px, 2.8vw, 38px);
  line-height: 1.65;
  letter-spacing: 0.01em;
  max-width: 20em;
}
.statement--center { margin-inline: auto; text-align: center; max-width: 22em; }

.quote {
  border-left: 2px solid var(--c-copper);
  padding: 6px 0 6px 32px;
  font-family: var(--font-serif);
  font-size: 19px;
  line-height: 1.85;
  color: var(--c-ink-soft);
}
.quote cite {
  display: block;
  margin-top: 20px;
  font-family: var(--font-sans);
  font-style: normal;
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--c-muted-lite);
  line-height: 1.7;
}

/* ---------- 18. Tag list ---------- */
.tags { display: flex; flex-wrap: wrap; gap: 10px; }
.tag {
  font-size: 12.5px;
  letter-spacing: 0.04em;
  padding: 7px 14px;
  border: 1px solid var(--line-mid);
  color: var(--c-muted);
}
.section--ink .tag { border-color: var(--line-dark-mid); color: rgba(250,248,243,.6); }

/* ---------- 19. Table ---------- */
.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }
.tbl { width: 100%; border-collapse: collapse; min-width: 640px; }
.tbl th, .tbl td {
  text-align: left;
  padding: 18px 20px 18px 0;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
  line-height: 1.75;
  vertical-align: top;
}
.tbl th {
  font-weight: 500;
  font-size: 11.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-copper);
  border-bottom-color: var(--line-mid);
  white-space: nowrap;
}
.tbl td:first-child { font-weight: 500; color: var(--c-ink); width: 22%; }
.tbl td { color: var(--c-muted); }
.tbl tr:hover td { background: rgba(14,21,18,.015); }

/* ---------- 20. Phase roadmap ---------- */
.phase {
  display: grid;
  grid-template-columns: 128px 1fr;
  gap: 40px;
  padding-block: 40px;
  border-top: 1px solid var(--line);
}
.phase:last-child { border-bottom: 1px solid var(--line); }
.phase__label { font-family: var(--font-serif); font-size: 20px; color: var(--c-copper-deep); }
.phase__label small { display: block; font-family: var(--font-sans); font-size: 11.5px; letter-spacing: 0.12em; color: var(--c-muted-lite); margin-top: 8px; }
.phase__items { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.phase__item h4 { font-size: 15.5px; font-weight: 500; margin-bottom: 8px; }
.phase__item p { font-size: 13.5px; line-height: 1.8; color: var(--c-muted); }
.phase__item span {
  display: inline-block;
  margin-top: 10px;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--c-copper);
  border: 1px solid currentColor;
  padding: 2px 7px;
}

/* ---------- 21. CTA band ---------- */
.cta-band {
  background: var(--c-ink);
  color: var(--c-paper);
  padding-block: 120px;
  position: relative;
  overflow: hidden;
  border-top: 1px solid var(--line-dark);
}
.cta-band__glow {
  position: absolute;
  width: 620px; height: 620px;
  left: 50%; bottom: -400px;
  transform: translateX(-50%);
  background: radial-gradient(circle, rgba(169,113,60,.22) 0%, transparent 65%);
  pointer-events: none;
}
.cta-band__inner { position: relative; z-index: 2; text-align: center; }
.cta-band .h2 { max-width: 22em; margin-inline: auto; }
.cta-band__sub { margin: 28px auto 0; max-width: 560px; font-size: 15.5px; line-height: 1.95; color: rgba(250,248,243,.58); }
.cta-band__actions { margin-top: 44px; display: flex; justify-content: center; flex-wrap: wrap; gap: 16px; }

/* ---------- 22. Footer ---------- */
.footer {
  background: var(--c-ink);
  color: rgba(250, 248, 243, 0.55);
  padding-block: 76px 36px;
  border-top: 1px solid var(--line-dark);
  font-size: 13.5px;
}
.footer__top {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 56px;
  padding-bottom: 56px;
  border-bottom: 1px solid var(--line-dark);
}
.footer .brand { color: var(--c-paper); margin-bottom: 22px; }
.footer__desc { font-size: 13px; line-height: 1.9; max-width: 300px; color: rgba(250,248,243,.45); }
.footer__col h5 {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(250,248,243,.4);
  margin-bottom: 20px;
}
.footer__col ul { display: grid; gap: 11px; }
.footer__col a { font-size: 13.5px; transition: color 0.3s; }
.footer__col a:hover { color: var(--c-copper-lite); }
.footer__bottom {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  padding-top: 28px;
  font-size: 12px;
  color: rgba(250,248,243,.32);
  letter-spacing: 0.02em;
}

/* ---------- 23. Page header (inner pages) ---------- */
.page-head {
  background: var(--c-ink);
  color: var(--c-paper);
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-top: 168px;
  padding-bottom: 88px;
  position: relative;
  overflow: hidden;
}
.page-head__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(250,248,243,.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(250,248,243,.03) 1px, transparent 1px);
  background-size: 80px 80px;
  -webkit-mask-image: radial-gradient(ellipse 80% 90% at 30% 50%, #000, transparent 85%);
  mask-image: radial-gradient(ellipse 80% 90% at 30% 50%, #000, transparent 85%);
  pointer-events: none;
}
.page-head__inner { position: relative; z-index: 2; }
.page-head__path {
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: rgba(250,248,243,.35);
  margin-bottom: 34px;
  display: flex;
  gap: 10px;
  align-items: center;
}
.page-head__path a:hover { color: var(--c-copper-lite); }
.page-head h1 {
  font-family: var(--font-serif);
  font-size: clamp(32px, 4.2vw, 56px);
  line-height: 1.36;
  max-width: 18em;
}
.page-head__sub {
  margin-top: 28px;
  max-width: 640px;
  font-size: 15.5px;
  line-height: 1.95;
  color: rgba(250,248,243,.58);
}

/* ---------- 24. Misc ---------- */
.rule { height: 1px; background: var(--line); border: 0; margin-block: 0; }
.rule--dark { background: var(--line-dark); }

.note {
  font-size: 12.5px;
  line-height: 1.8;
  color: var(--c-muted-lite);
  padding-left: 16px;
  border-left: 1px solid var(--line-mid);
  margin-top: 28px;
}
.section--ink .note { color: rgba(250,248,243,.4); border-left-color: var(--line-dark-mid); }

.badge {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 0.1em;
  padding: 4px 10px;
  border: 1px solid var(--line-mid);
  color: var(--c-muted);
}
.section--ink .badge { border-color: var(--line-dark-mid); color: rgba(250,248,243,.55); }

.mt-s { margin-top: 16px; }
.mt-m { margin-top: 32px; }
.mt-l { margin-top: 56px; }
.mb-m { margin-bottom: 32px; }
.tc { text-align: center; }

/* ---------- 25. Reveal animation ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.9s var(--ease), transform 0.9s var(--ease);
  will-change: opacity, transform;
}
[data-reveal].is-in { opacity: 1; transform: none; }
[data-reveal][data-delay="1"] { transition-delay: 0.08s; }
[data-reveal][data-delay="2"] { transition-delay: 0.16s; }
[data-reveal][data-delay="3"] { transition-delay: 0.24s; }
[data-reveal][data-delay="4"] { transition-delay: 0.32s; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  [data-reveal] { opacity: 1 !important; transform: none !important; transition: none !important; }
}

/* ---------- 26. Responsive ---------- */
@media (max-width: 1080px) {
  :root { --gutter: 26px; }
  .section { padding-block: 96px; }
  .split { grid-template-columns: 1fr; gap: 48px; }
  .split--rev { grid-template-columns: 1fr; }
  .case { grid-template-columns: 1fr; gap: 32px; }
  .case__side { position: static; }
  .phase__items { grid-template-columns: repeat(2, 1fr); }
  .footer__top { grid-template-columns: 1fr 1fr; gap: 40px; }
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 860px) {
  .nav__links { display: none; }
  .nav__cta { display: none; }
  .nav__toggle { display: flex; }
  .hero { padding-top: 130px; padding-bottom: 88px; }
  .hero__verse { display: none; }
  .hero__stats { grid-template-columns: repeat(2, 1fr); margin-top: 72px; }
  .hero__stat { padding: 26px 18px 30px; }
  .hero__stat:nth-child(2) { border-right: 0; }
  .hero__stat:nth-child(1), .hero__stat:nth-child(2) { border-bottom: 1px solid var(--line-dark); }
  .grid--3 { grid-template-columns: 1fr; gap: 32px; }
  .grid--2 { grid-template-columns: 1fr; gap: 32px; }
  .triad { grid-template-columns: 1fr; }
  .triad__item { border-right: 0; padding: 32px 22px 36px; }
  .steps { grid-template-columns: 1fr; }
  .step { border-right: 0; border-bottom: 1px solid var(--line); padding: 28px 0 32px; }
  .step:last-child { border-bottom: 0; }
  .rung { grid-template-columns: 1fr; gap: 14px; padding: 26px 22px; }
  .phase { grid-template-columns: 1fr; gap: 22px; }
  .phase__items { grid-template-columns: 1fr; }
  .case__block { grid-template-columns: 1fr; gap: 8px; }
  .layer { grid-template-columns: 1fr; gap: 10px; }
  .page-head { padding-top: 132px; padding-bottom: 64px; }
  .cta-band { padding-block: 84px; }
  .section-head { margin-bottom: 44px; }
  .footer__top { grid-template-columns: 1fr; gap: 36px; }
  .qcard__title { font-size: 19px; }
}

@media (max-width: 560px) {
  :root { --gutter: 20px; }
  .section { padding-block: 72px; }
  .hero__title { font-size: 32px; line-height: 1.42; }
  .hero__sub { font-size: 15px; }
  .hero__actions { flex-direction: column; align-items: stretch; }
  .btn { justify-content: center; }
  .case__result { gap: 24px; }
  .grid--4 { grid-template-columns: 1fr; }
  .path { padding: 32px 24px 36px; }
  .statement { font-size: 22px; }
}

/* ---------- 27. Mobile menu panel ---------- */
.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: 99;
  background: var(--c-ink);
  color: var(--c-paper);
  padding: 120px var(--gutter) 48px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: opacity 0.4s var(--ease), transform 0.4s var(--ease), visibility 0.4s;
}
.mobile-menu.is-open { opacity: 1; visibility: visible; transform: none; }
.mobile-menu a {
  font-family: var(--font-serif);
  font-size: 26px;
  padding-block: 18px;
  border-bottom: 1px solid var(--line-dark);
}
.mobile-menu__foot {
  margin-top: auto;
  font-size: 12.5px;
  color: rgba(250,248,243,.4);
  line-height: 1.9;
}
body.is-locked { overflow: hidden; }
body.is-locked .nav { background: transparent; border-bottom-color: transparent; color: var(--c-paper); }
body.is-locked .nav .brand__en { opacity: 0.55; }
body.is-locked .nav .nav__cta { color: var(--c-paper); }

/* ---------- 28. Nav state corrections ---------- */
.nav.on-dark.is-scrolled .nav__link.is-active { color: var(--c-copper-deep); }
.nav.on-dark.is-scrolled .brand__en { opacity: 0.45; }
.nav.on-dark.is-scrolled .nav__cta { color: var(--c-ink); }
.nav.on-dark.is-scrolled .nav__cta:hover { color: #fff; }
.nav:not(.on-dark) .nav__link.is-active { color: var(--c-copper-deep); }


/* ---------- 29. Brand logo ---------- */
.brand__logo {
  height: 38px;
  width: auto;
  display: block;
  flex: none;
}
.brand__logo--white { display: none; }
.nav.on-dark .brand__logo--color { display: none; }
.nav.on-dark .brand__logo--white { display: block; }
.nav.on-dark.is-scrolled .brand__logo--color { display: block; }
.nav.on-dark.is-scrolled .brand__logo--white { display: none; }
.footer .brand__logo--color { display: none; }
.footer .brand__logo--white { display: block; }

/* ---------- 30. Contact QR ---------- */
.contact-qr {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-top: 38px;
}
.contact-qr img {
  width: 116px;
  height: auto;
  background: #fff;
  padding: 7px;
  border-radius: 2px;
  flex: none;
}
.contact-qr p {
  font-size: 12.5px;
  line-height: 1.9;
  color: rgba(250, 248, 243, 0.5);
  letter-spacing: 0.02em;
}
.contact-qr p strong {
  display: block;
  font-weight: 500;
  color: var(--c-copper-lite);
  margin-bottom: 4px;
  font-size: 13px;
}

@media (max-width: 860px) {
  .brand__logo { height: 29px; }
}
@media (max-width: 560px) {
  .brand__logo { height: 27px; }
  .contact-qr img { width: 100px; }
}


/* ---------- 31. Flow figure ---------- */
.flow-figure {
  margin: 0 0 76px;
  max-width: 1060px;
}
.flow-figure img {
  display: block;
  width: 100%;
  height: auto;
  background: #fff;
  border: 1px solid var(--line);
}
@media (max-width: 860px) {
  .flow-figure { margin-bottom: 48px; }
}


/* ---------- 32. Case figure ---------- */
.case__figure {
  margin: 0 0 40px;
  max-width: 700px;
}
.case__figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line-mid);
}
@media (max-width: 860px) {
  .case__figure { margin-bottom: 28px; }
}


/* ---------- 33. Footer ICP ---------- */
.footer__link {
  color: inherit;
  transition: color 0.2s ease;
}
.footer__link:hover { color: var(--c-copper-lite); }

@media (max-width: 640px) {
  .footer__bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }
}

@media (max-width: 640px) {
  .footer__bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }
}