:root {
  --china-red: #e42027;
  --crimson: #8d3d4a;
  --crimson-deep: #712f3a;
  --crimson-ink: #3f1b21;
  --gold: #fdd100;
  --gold-deep: #c9a000;
  --khaki: #f7e8d5;
  --paper: #fbf3ea;
  --ivory: #fefbf6;
  --ink: #2a1619;
  --ink-soft: #5c3d43;
  --line: rgba(141, 61, 74, 0.18);
  --line-strong: rgba(141, 61, 74, 0.38);
  --shadow: 0 18px 40px rgba(63, 27, 33, 0.08);
  --font-serif: "Songti SC", "STSong", "Noto Serif SC", "SimSun", serif;
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-en: "Cormorant Garamond", Palatino, "Palatino Linotype", "Times New Roman", serif;
  --header-h: 84px;
  --rail: 10px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body::before {
  content: "";
  position: fixed;
  inset: 0 auto 0 0;
  width: var(--rail);
  z-index: 80;
  pointer-events: none;
  background:
    url("../assets/pattern-cloud.svg") center / 180px auto repeat-y,
    linear-gradient(180deg, var(--crimson-deep), var(--crimson) 40%, var(--crimson-ink));
  box-shadow: inset -1px 0 0 var(--gold-deep);
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.22;
  background: url("../assets/paper-grain.svg");
}

main,
.site-footer {
  position: relative;
  z-index: 1;
}

img {
  max-width: 100%;
  display: block;
}

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

button {
  font-family: inherit;
  cursor: pointer;
}

.skip {
  position: absolute;
  left: -999px;
  top: 8px;
}

.skip:focus {
  left: 16px;
  z-index: 100;
  background: var(--ivory);
  padding: 8px 14px;
  border: 1px solid var(--crimson);
}

.wrap {
  width: min(1180px, calc(100% - 56px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 70;
  background: rgba(254, 251, 246, 0.92);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.35s var(--ease), box-shadow 0.35s var(--ease);
}

.site-header::before {
  content: "";
  display: block;
  height: 3px;
  background: linear-gradient(90deg, var(--crimson), var(--china-red) 35%, var(--gold) 70%, var(--crimson));
}

.site-header.is-scrolled {
  border-bottom-color: var(--line);
  box-shadow: 0 8px 30px rgba(63, 27, 33, 0.06);
}

.header-inner {
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding-left: 12px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
}

.brand-logo {
  height: 52px;
  width: auto;
  max-width: min(340px, 42vw);
  object-fit: contain;
  object-position: left center;
}

.brand-seal {
  display: none;
  width: 46px;
  height: 46px;
}

.nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav a {
  position: relative;
  padding: 10px 14px;
  color: var(--ink-soft);
  font-size: 15px;
  letter-spacing: 0.06em;
  transition: color 0.25s var(--ease);
}

.nav a::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 6px;
  height: 1.5px;
  background: var(--gold-deep);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 0.3s var(--ease);
}

.nav a:hover,
.nav a.is-active {
  color: var(--crimson);
}

.nav a.is-active::after,
.nav a:hover::after {
  transform: scaleX(1);
}

.nav-toggle {
  display: none;
  position: relative;
  z-index: 76;
  width: 44px;
  height: 44px;
  border: 1px solid var(--line-strong);
  background: var(--ivory);
  color: var(--crimson);
  padding: 0;
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 1.5px;
  margin: 5px auto;
  background: currentColor;
  transition: 0.25s var(--ease);
}

.nav-backdrop {
  display: none;
}

.hero {
  position: relative;
  min-height: 78vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  color: var(--ivory);
  background: #8eb8d4;
}

.hero-media {
  position: absolute;
  inset: 0;
}

.hero-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(105deg, rgba(63, 27, 33, 0.42) 0%, rgba(141, 61, 74, 0.26) 48%, rgba(141, 61, 74, 0.1) 100%),
    linear-gradient(to top, rgba(63, 27, 33, 0.22), transparent 42%);
  pointer-events: none;
}

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 42%;
  transform: scale(1.04);
  animation: heroZoom 18s var(--ease) both;
}

@keyframes heroZoom {
  from { transform: scale(1.1); }
  to { transform: scale(1.04); }
}

.hero-frame {
  position: absolute;
  inset: 22px 22px 22px 28px;
  border: 1px solid rgba(248, 208, 0, 0.28);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 2;
  padding: 120px 0 88px;
  text-shadow: 0 2px 14px rgba(0, 0, 0, 0.45);
}

.hero .btn {
  text-shadow: none;
}

.hero .btn-ghost {
  background: rgba(254, 251, 246, 0.94);
  color: var(--crimson);
  border-color: transparent;
}

.hero .btn-ghost:hover {
  background: #fff;
}

.kicker {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--gold);
  font-family: var(--font-en);
  font-size: 13px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
}

.kicker::before,
.kicker::after {
  content: "";
  width: 22px;
  height: 1px;
  background: currentColor;
}

.hero h1 {
  margin: 18px 0 16px;
  max-width: 16em;
  font-family: var(--font-serif);
  font-size: clamp(34px, 4.6vw, 58px);
  font-weight: 700;
  line-height: 1.22;
  letter-spacing: 0.08em;
}

.hero-lead {
  max-width: 38em;
  margin: 0 0 36px;
  color: rgba(254, 251, 246, 0.9);
  font-size: 17px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 46px;
  padding: 0 22px;
  border: 1px solid transparent;
  font-size: 15px;
  letter-spacing: 0.12em;
  transition: transform 0.3s var(--ease), background 0.3s var(--ease), color 0.3s var(--ease), border-color 0.3s var(--ease);
}

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

.btn-primary {
  background: var(--china-red);
  color: #fff;
  box-shadow: 0 8px 20px rgba(228, 32, 39, 0.28);
}

.btn-primary:hover {
  background: #c41c22;
}

.btn-ghost {
  border-color: rgba(248, 208, 0, 0.55);
  color: var(--ivory);
  background: rgba(255, 253, 248, 0.06);
}

.btn-ghost:hover {
  background: rgba(248, 208, 0, 0.16);
}

.btn-line {
  border-color: var(--crimson);
  color: var(--crimson);
  background: transparent;
}

.btn-line:hover {
  background: var(--crimson);
  color: var(--ivory);
}

.section {
  position: relative;
  z-index: 1;
  padding: 96px 0;
}

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 48px;
}

.eyebrow {
  color: var(--gold-deep);
  font-family: var(--font-en);
  font-size: 13px;
  letter-spacing: 0.32em;
  text-transform: uppercase;
}

.section h2 {
  margin: 8px 0 0;
  font-family: var(--font-serif);
  font-size: clamp(28px, 3vw, 40px);
  font-weight: 700;
  letter-spacing: 0.12em;
  line-height: 1.3;
}

.section h2 span {
  display: block;
  margin-top: 6px;
  color: var(--ink-soft);
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 400;
  letter-spacing: 0.04em;
}

.rule {
  width: 56px;
  height: 2px;
  margin: 16px 0 0;
  background: linear-gradient(90deg, var(--china-red), var(--gold));
}

.intro-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 56px;
  align-items: center;
}

.intro-copy p {
  margin: 0 0 18px;
  color: var(--ink-soft);
  font-size: 16px;
}

.stat-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-top: 32px;
}

.stat {
  padding: 18px 8px 8px 0;
  border-top: 1px solid var(--line-strong);
}

.stat b {
  display: block;
  font-family: var(--font-en);
  font-size: 36px;
  font-weight: 600;
  color: var(--crimson);
  line-height: 1.1;
}

.stat span {
  color: var(--ink-soft);
  font-size: 13px;
  letter-spacing: 0.08em;
}

.frame-photo {
  position: relative;
}

.frame-photo img {
  width: 100%;
  height: 460px;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.04);
}

.frame-photo::before {
  content: "";
  position: absolute;
  inset: 14px -14px -14px 14px;
  border: 1px solid var(--gold-deep);
  z-index: -1;
}

.frame-caption {
  position: absolute;
  right: 16px;
  bottom: 16px;
  padding: 8px 12px;
  background: rgba(63, 27, 33, 0.78);
  color: var(--khaki);
  font-size: 12px;
  letter-spacing: 0.16em;
}

.pillars {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.pillar {
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: 280px;
  padding: 28px 22px 22px;
  background: var(--ivory);
  border: 1px solid var(--line);
  overflow: hidden;
  transition: transform 0.4s var(--ease), box-shadow 0.4s var(--ease), border-color 0.4s var(--ease);
}

.pillar::after {
  content: "";
  position: absolute;
  inset: 10px;
  border: 1px solid transparent;
  pointer-events: none;
  transition: border-color 0.4s var(--ease);
}

.pillar:hover {
  transform: translateY(-6px);
  border-color: var(--crimson);
  box-shadow: var(--shadow);
}

.pillar:hover::after {
  border-color: rgba(201, 160, 0, 0.45);
}

.pillar-index {
  font-family: var(--font-en);
  color: var(--gold-deep);
  letter-spacing: 0.18em;
}

.pillar h3 {
  margin: 16px 0 12px;
  font-family: var(--font-serif);
  font-size: 24px;
  letter-spacing: 0.1em;
}

.pillar p {
  margin: 0 0 20px;
  color: var(--ink-soft);
  flex: 1;
  font-size: 14px;
  line-height: 1.7;
}

.more {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--crimson);
  letter-spacing: 0.16em;
  font-size: 13px;
}

.more svg {
  transition: transform 0.3s var(--ease);
}

.pillar:hover .more svg,
.tool:hover .more svg {
  transform: translateX(5px);
}

.tools {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  overflow: visible;
  padding-top: 14px;
  margin-top: -14px;
}

.tool {
  position: relative;
  top: 0;
  display: block;
  padding: 28px 24px 24px;
  background: var(--ivory);
  border: 1px solid var(--line);
  z-index: 0;
  opacity: 1;
  animation: none;
  transition:
    top 0.28s var(--ease),
    box-shadow 0.28s var(--ease),
    border-color 0.28s var(--ease);
}

.tool::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--crimson), var(--gold));
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.28s var(--ease);
}

.tool::after {
  content: "";
  position: absolute;
  inset: 10px;
  border: 1px solid transparent;
  pointer-events: none;
  transition: border-color 0.28s var(--ease);
}

.tool:hover,
.tool:focus-visible {
  top: -12px;
  z-index: 3;
  border-color: var(--crimson);
  box-shadow:
    0 20px 36px rgba(141, 61, 74, 0.22),
    0 8px 14px rgba(63, 27, 33, 0.1);
}

.tool:hover::before,
.tool:focus-visible::before {
  transform: scaleX(1);
}

.tool:hover::after,
.tool:focus-visible::after {
  border-color: rgba(201, 160, 0, 0.4);
}

.tool-icon {
  width: 42px;
  height: 42px;
  color: var(--crimson);
  transition: transform 0.28s var(--ease);
}

.tool:hover .tool-icon,
.tool:focus-visible .tool-icon {
  transform: translateY(-3px);
}

.tool-icon svg {
  width: 42px;
  height: 42px;
}

.tool h3 {
  margin: 18px 0 8px;
  font-family: var(--font-serif);
  font-size: 22px;
  letter-spacing: 0.08em;
}

.tool p {
  margin: 0 0 22px;
  color: var(--ink-soft);
  font-size: 14px;
  min-height: 4.6em;
}

.page-hero {
  position: relative;
  padding: 72px 0 56px;
  background:
    linear-gradient(180deg, rgba(247, 232, 213, 0.55), rgba(251, 243, 234, 0.2)),
    var(--paper);
  overflow: hidden;
}

.page-hero::before {
  content: "";
  position: absolute;
  right: -40px;
  top: -80px;
  width: 280px;
  height: 280px;
  background: url("../assets/seal.webp") center / contain no-repeat;
  opacity: 0.07;
  pointer-events: none;
}

.crumbs {
  margin-bottom: 18px;
  color: var(--ink-soft);
  font-size: 13px;
  letter-spacing: 0.08em;
}

.crumbs a:hover {
  color: var(--crimson);
}

.page-hero h1 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(32px, 4vw, 48px);
  letter-spacing: 0.14em;
}

.page-hero p {
  max-width: 40em;
  margin: 14px 0 0;
  color: var(--ink-soft);
}

.cta-banner {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  min-height: 420px;
  background: var(--crimson);
  color: var(--ivory);
  overflow: hidden;
}

.cta-copy {
  padding: 64px 56px;
}

.cta-copy h2 {
  margin: 12px 0 16px;
  font-family: var(--font-serif);
  font-size: 36px;
  letter-spacing: 0.12em;
}

.cta-copy p {
  color: rgba(255, 253, 248, 0.8);
  margin: 0 0 28px;
}

.cta-visual {
  position: relative;
}

.cta-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  min-height: 420px;
}

.cta-visual.is-preview {
  background: #12141c;
  display: flex;
  align-items: stretch;
}

.cta-visual.is-preview img {
  object-fit: cover;
  object-position: center;
}

.links {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.link-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 168px;
  padding: 22px 20px;
  border: 1px solid var(--line);
  background: var(--ivory);
  transition: 0.35s var(--ease);
}

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

.link-card strong {
  font-family: var(--font-serif);
  font-size: 18px;
  letter-spacing: 0.06em;
  line-height: 1.5;
}

.link-card span {
  color: var(--gold-deep);
  font-size: 12px;
  letter-spacing: 0.18em;
}

.site-footer {
  position: relative;
  z-index: 1;
  background: var(--crimson);
  color: rgba(255, 253, 248, 0.78);
  padding: 56px 0 28px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 36px;
  border-bottom: 1px solid rgba(247, 232, 213, 0.12);
}

.footer-brand {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.footer-brand img {
  width: 64px;
  height: 64px;
  background: var(--ivory);
  border-radius: 50%;
}

.footer-brand h3 {
  margin: 0 0 8px;
  color: var(--ivory);
  font-family: var(--font-serif);
  font-size: 20px;
  letter-spacing: 0.1em;
}

.footer-brand p {
  margin: 0;
  font-size: 13px;
}

.site-footer h4 {
  margin: 0 0 14px;
  color: var(--gold);
  font-size: 13px;
  letter-spacing: 0.22em;
}

.site-footer ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-footer li {
  margin: 8px 0;
}

.site-footer a:hover {
  color: var(--gold);
}

.copyright {
  padding-top: 22px;
  font-size: 13px;
  letter-spacing: 0.06em;
  text-align: center;
}

.reveal {
  opacity: 0;
  animation: rise 0.9s var(--ease) forwards;
}

.tool.reveal {
  opacity: 1;
  animation: none;
}

.delay-1 { animation-delay: 0.08s; }
.delay-2 { animation-delay: 0.16s; }
.delay-3 { animation-delay: 0.24s; }
.delay-4 { animation-delay: 0.32s; }

@keyframes rise {
  to {
    opacity: 1;
  }
}

.loop-board {
  max-width: 980px;
  margin: 0 auto;
}

.loop-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 72px minmax(0, 1fr);
  grid-template-rows: auto 64px auto;
  grid-template-areas:
    "learn east decide"
    "north hub south"
    "drill west research";
  gap: 16px 12px;
  align-items: stretch;
}

.loop-box.is-learn { grid-area: learn; }
.loop-arrow.is-right { grid-area: east; }
.loop-box.is-decide { grid-area: decide; }
.loop-arrow.is-up { grid-area: north; }
.loop-hub { grid-area: hub; }
.loop-arrow.is-down { grid-area: south; }
.loop-box.is-drill { grid-area: drill; }
.loop-arrow.is-left { grid-area: west; }
.loop-box.is-research { grid-area: research; }

.loop-box {
  min-height: 188px;
  padding: 26px 28px 24px;
  background: var(--ivory);
  border: 1px solid var(--line);
}

.loop-box span {
  display: inline-block;
  min-width: 32px;
  padding: 3px 10px;
  margin-bottom: 10px;
  background: var(--crimson);
  color: var(--khaki);
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-align: center;
}

.loop-box.is-decide span,
.loop-box.is-research span {
  background: var(--china-red);
}

.loop-box h3 {
  margin: 0 0 10px;
  font-family: var(--font-sans);
  font-size: 22px;
  font-weight: 600;
  letter-spacing: 0.06em;
}

.loop-box p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.7;
}

.loop-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
}

.loop-arrow i {
  position: relative;
  display: block;
  background: var(--gold-deep);
}

.loop-arrow.is-right i,
.loop-arrow.is-left i {
  width: 40px;
  height: 2px;
}

.loop-arrow.is-up i,
.loop-arrow.is-down i {
  width: 2px;
  height: 32px;
}

.loop-arrow i::after {
  content: "";
  position: absolute;
  width: 9px;
  height: 9px;
  border-top: 2px solid var(--crimson);
  border-right: 2px solid var(--crimson);
}

.loop-arrow.is-right i::after {
  right: -1px;
  top: 50%;
  transform: translateY(-50%) rotate(45deg);
}

.loop-arrow.is-down i::after {
  bottom: -1px;
  left: 50%;
  transform: translateX(-50%) rotate(135deg);
}

.loop-arrow.is-left i::after {
  left: -1px;
  top: 50%;
  transform: translateY(-50%) rotate(-135deg);
}

.loop-arrow.is-up i::after {
  top: -1px;
  left: 50%;
  transform: translateX(-50%) rotate(-45deg);
}

.loop-hub {
  display: flex;
  align-items: center;
  justify-content: center;
  margin: auto;
  width: 56px;
  height: 56px;
  background: var(--crimson-ink);
  color: var(--khaki);
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.12em;
}

.cycle-gate {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 14px;
  padding: 10px 14px;
  background: var(--crimson-ink);
  color: rgba(254, 251, 246, 0.88);
  font-size: 13px;
  line-height: 1.55;
}

.cycle-gate span {
  flex: none;
  padding: 4px 10px;
  border: 1px solid var(--gold);
  color: var(--gold);
  letter-spacing: 0.18em;
  font-size: 12px;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0 0 28px;
}

.tag {
  padding: 6px 14px;
  border: 1px solid var(--line-strong);
  background: var(--ivory);
  color: var(--crimson);
  font-size: 13px;
  letter-spacing: 0.12em;
}

.agv-intro,
.page-intro {
  max-width: 760px;
}

.agv-intro p,
.page-intro p {
  color: var(--ink-soft);
}

.agv-blocks {
  display: flex;
  flex-direction: row;
  flex-wrap: nowrap;
  align-items: stretch;
  gap: 12px;
}

.agv-blocks .tool {
  flex: 1 1 0;
  min-width: 0;
  width: auto;
  padding: 20px 14px 16px;
}

.feature-blocks {
  grid-template-columns: repeat(2, 1fr);
}

.agv-blocks .tool p {
  min-height: 0;
  font-size: 13px;
}

.agv-blocks .tool,
.feature-blocks .tool {
  cursor: default;
}

.agv-blocks .tool:hover,
.feature-blocks .tool:hover {
  top: 0;
  z-index: 0;
  border-color: var(--line-strong);
  box-shadow: none;
}

.agv-blocks .tool:hover::before,
.agv-blocks .tool:hover::after,
.feature-blocks .tool:hover::before,
.feature-blocks .tool:hover::after {
  transform: none;
  border-color: transparent;
}

.article h3 {
  margin: 32px 0 10px;
  font-family: var(--font-serif);
  letter-spacing: 0.1em;
}

.article p,
.article li {
  color: var(--ink-soft);
}

.bg-ivory {
  background: linear-gradient(180deg, var(--khaki) 0%, var(--paper) 18%, var(--paper) 100%);
}

.bg-paper {
  background: var(--paper);
}

@media (max-width: 980px) {
  .intro-grid,
  .cta-banner,
  .footer-grid,
  .tools,
  .links {
    grid-template-columns: 1fr;
  }

  .pillars {
    grid-template-columns: 1fr 1fr;
  }

  .tools {
    grid-template-columns: 1fr 1fr;
  }

  .nav-toggle {
    display: block;
  }

  .nav {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: min(80vw, 320px);
    flex-direction: column;
    align-items: stretch;
    padding: 88px 24px 32px;
    background: var(--crimson-ink);
    transform: translateX(100%);
    transition: transform 0.4s var(--ease);
    z-index: 75;
  }

  .nav.is-open {
    transform: none;
  }

  .nav-backdrop {
    display: block;
    position: fixed;
    inset: 0;
    background: rgba(63, 27, 33, 0.45);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.35s var(--ease);
    z-index: 74;
  }

  .nav-backdrop.is-open {
    opacity: 1;
    pointer-events: auto;
  }

  .nav a {
    color: var(--khaki);
    padding: 14px 8px;
    border-bottom: 1px solid rgba(247, 232, 213, 0.12);
  }

  .nav a.is-active,
  .nav a:hover {
    color: var(--gold);
  }

  .brand-logo {
    display: none;
  }

  .brand-seal {
    display: block;
  }

  .stat-row,
  .links {
    grid-template-columns: 1fr 1fr;
  }

  .hero-frame {
    inset: 12px;
  }

  .loop-grid {
    grid-template-columns: minmax(0, 1fr) 56px minmax(0, 1fr);
    grid-template-rows: auto 56px auto;
  }

  .loop-box {
    min-height: 160px;
    padding: 20px 18px 18px;
  }
}

@media (max-width: 640px) {
  .wrap {
    width: min(100% - 32px, 1180px);
  }

  body::before {
    width: 4px;
  }

  .tools,
  .stat-row,
  .links,
  .pillars,
  .feature-blocks,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .agv-blocks {
    flex-wrap: nowrap;
  }

  .agv-blocks .tool h3 {
    font-size: 16px;
  }

  .loop-grid {
    grid-template-columns: minmax(0, 1fr) 24px minmax(0, 1fr);
    grid-template-rows: auto 32px auto;
    gap: 8px 4px;
  }

  .loop-box {
    min-height: 0;
    padding: 14px 12px 12px;
  }

  .loop-box h3 {
    font-size: 14px;
  }

  .loop-box p {
    font-size: 12px;
    line-height: 1.5;
  }

  .loop-arrow.is-right i,
  .loop-arrow.is-left i {
    width: 14px;
  }

  .loop-arrow.is-up i,
  .loop-arrow.is-down i {
    height: 14px;
  }

  .loop-hub {
    width: 32px;
    height: 32px;
    font-size: 11px;
    letter-spacing: 0.08em;
  }

  .cycle-gate {
    flex-direction: column;
    align-items: flex-start;
  }

  .hero {
    min-height: 88vh;
  }

  .cta-copy {
    padding: 40px 24px;
  }

  .section {
    padding: 72px 0;
  }
}