:root {
  color-scheme: light;
  --ink: #151515;
  --muted: #6f6b64;
  --paper: #f4f0e7;
  --panel: #fffaf0;
  --line: #ded2bd;
  --red: #c8111a;
  --gold: #c7a059;
  --charcoal: #12110f;
  --shadow: 0 24px 80px rgba(32, 22, 10, 0.18);
  --max-w: 1200px;
  --page-gutter: clamp(24px, 5vw, 64px);
  --content-side: max(var(--page-gutter), calc((100vw - var(--max-w)) / 2));
  --section-y: clamp(72px, 8vw, 96px);
  --section-gap: clamp(34px, 5vw, 64px);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    linear-gradient(90deg, rgba(199, 160, 89, 0.08) 1px, transparent 1px),
    linear-gradient(180deg, #f8f4ea 0, var(--paper) 460px);
  background-size: 78px 78px, auto;
  color: var(--ink);
  font-family: Inter, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.68;
  font-weight: 400;
  overflow-x: hidden;
}

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

a {
  color: inherit;
}

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

/* ── Header ── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: grid;
  grid-template-columns: auto 1fr auto auto;
  gap: 28px;
  align-items: center;
  min-height: 76px;
  padding: 14px var(--content-side);
  background: rgba(18, 17, 15, 0.9);
  border-bottom: 1px solid rgba(222, 210, 189, 0.32);
  backdrop-filter: blur(16px);
}

.brand {
  display: grid;
  color: #fff;
  text-decoration: none;
}

.brand span {
  font-size: 21px;
  font-weight: 800;
  line-height: 1;
}

.brand small {
  margin-top: 5px;
  color: var(--gold);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.nav {
  display: flex;
  justify-content: center;
  gap: 24px;
}

.nav a,
.header-cta,
.footer a {
  text-decoration: none;
}

.nav a {
  color: rgba(255, 255, 255, 0.76);
  font-size: 14px;
  font-weight: 700;
}

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

.language-switcher {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  width: 150px;
  padding: 3px;
  border: 1px solid rgba(255, 255, 255, 0.24);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  position: relative;
  z-index: 2;
}

.language-switcher button {
  flex: 1 1 0;
  min-width: 0;
  min-height: 32px;
  padding: 5px 10px;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: rgba(255, 255, 255, 0.66);
  cursor: pointer;
  font: inherit;
  font-size: 12px;
  font-weight: 800;
}

.language-switcher button.is-active {
  background: #fff;
  color: var(--ink);
}

/* Hamburger toggle - hidden on desktop */
.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  padding: 6px;
  background: none;
  border: 1px solid rgba(255,255,255,0.28);
  border-radius: 6px;
  cursor: pointer;
}

.menu-toggle span {
  display: block;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: transform 0.25s, opacity 0.25s;
}

.menu-toggle.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.menu-toggle.open span:nth-child(2) {
  opacity: 0;
}

.menu-toggle.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.header-cta,
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  font-weight: 700;
  text-decoration: none;
}

.header-cta {
  min-height: 40px;
  padding: 8px 14px;
  background: #fff;
  color: var(--ink);
  font-size: 13px;
}

/* ── Hero ── */
.hero {
  position: relative;
  min-height: calc(100vh - 76px);
  display: grid;
  align-items: end;
  overflow: hidden;
  background: #050505;
}

.hero > img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 52% 46%;
}

.hero-shade {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(0, 0, 0, 0.9), rgba(0, 0, 0, 0.58) 42%, rgba(0, 0, 0, 0.16)),
    linear-gradient(0deg, rgba(0, 0, 0, 0.72), rgba(0, 0, 0, 0.06) 48%);
}

.hero-content {
  position: relative;
  width: min(var(--max-w), calc(100% - (var(--page-gutter) * 2)));
  margin: 0 auto;
  padding: 9vh 0 11vh;
  color: #fff;
}

.hero-kicker {
  display: inline-flex;
  margin-bottom: 18px;
  padding: 7px 11px;
  border: 1px solid rgba(199, 160, 89, 0.58);
  border-radius: 999px;
  background: rgba(0, 0, 0, 0.28);
  color: rgba(255, 255, 255, 0.84);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--gold);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero h1 {
  max-width: 880px;
  margin: 0;
  font-size: clamp(38px, 6.5vw, 72px);
  font-weight: 800;
  line-height: 1.08;
}

.mobile-title {
  display: none;
}

.hero-copy {
  max-width: 760px;
  margin: 24px 0 0;
  color: rgba(255, 255, 255, 0.88);
  font-size: clamp(17px, 2vw, 20px);
  font-weight: 400;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

.button {
  min-height: 50px;
  padding: 12px 18px;
}

.button.primary {
  background: var(--red);
  color: #fff;
}

.button.secondary {
  border: 1px solid rgba(255, 255, 255, 0.48);
  color: #fff;
}

/* ── Proof Strip ── */
.proof-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  padding-right: var(--content-side);
  padding-left: var(--content-side);
  background: #15130f;
  border-bottom: 1px solid rgba(222, 210, 189, 0.28);
}

.proof-strip article {
  padding: 34px clamp(18px, 3vw, 34px);
  border-right: 1px solid rgba(255, 255, 255, 0.12);
}

.proof-strip article:last-child {
  border-right: 0;
}

.proof-strip strong {
  display: block;
  color: var(--gold);
  font-size: clamp(34px, 5vw, 52px);
  font-weight: 800;
  line-height: 1;
}

.proof-strip span {
  display: block;
  margin-top: 9px;
  color: rgba(255, 255, 255, 0.7);
  font-weight: 500;
}

/* ── Sections - global ── */
/* 优化4: 不同 section 使用不同间距，形成阅读节奏 */
.section {
  width: min(var(--max-w), calc(100% - (var(--page-gutter) * 2)));
  max-width: none;
  margin-left: auto;
  margin-right: auto;
  padding: var(--section-y) 0;
}

/* 需要全宽背景的 section 恢复 */
.dark,
.split-proof,
.model,
.tiers,
.growth,
.value-add {
  max-width: none;
}

.dark > .section-heading,
.dark > .asset-grid,
.model > .section-heading,
.model > .model-grid,
.tiers > .section-heading,
.tiers > .tier-table,
.growth > img,
.growth > div,
.value-add > .section-heading,
.value-add > .value-grid {
  max-width: var(--max-w);
}

.dark,
.model,
.tiers,
.value-add {
  width: 100%;
  padding-left: var(--page-gutter);
  padding-right: var(--page-gutter);
}

.dark > .section-heading,
.dark > .asset-grid,
.model > .section-heading,
.model > .model-grid,
.tiers > .section-heading,
.tiers > .tier-table,
.value-add > .section-heading,
.value-add > .value-grid {
  margin-left: auto;
  margin-right: auto;
}

/* 优化4: 节奏变化 */
.conclusion {
  padding-top: 72px;
  padding-bottom: 48px;
}

.media-band {
  padding-top: 0;
  padding-bottom: 48px;
}

.portfolio {
  padding-top: 24px;
  padding-bottom: 80px;
}

.dark {
  padding-top: 88px;
  padding-bottom: 88px;
}

.split-proof {
  padding-top: 72px;
  padding-bottom: 72px;
}

.model {
  padding-top: 80px;
  padding-bottom: 80px;
}

.funding {
  padding-top: 72px;
  padding-bottom: 72px;
}

.tiers {
  padding-top: 88px;
  padding-bottom: 88px;
}

.growth {
  padding-top: 80px;
  padding-bottom: 80px;
}

.value-add {
  padding-top: 72px;
  padding-bottom: 72px;
}

.section-heading {
  max-width: 900px;
  margin-bottom: 34px;
}

.section h2,
.closing h2 {
  margin: 0;
  font-size: clamp(28px, 4.8vw, 50px);
  font-weight: 800;
  line-height: 1.14;
}

.section h3 {
  margin: 0;
  font-size: 20px;
  font-weight: 800;
  line-height: 1.25;
}

/* 优化3: 正文字重降低 */
.section p {
  color: var(--muted);
  font-weight: 400;
  line-height: 1.72;
}

.conclusion {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: var(--section-gap);
  align-items: center;
}

.conclusion > p {
  margin: 0;
  color: #3f3b36;
  font-size: clamp(18px, 2.1vw, 22px);
  font-weight: 500;
  line-height: 1.7;
}

/* ── Media Band ── */
/* 优化2: 用 aspect-ratio 替代固定高度 */
.media-band {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.media-band img {
  width: 100%;
  aspect-ratio: 4 / 3;
  border: 1px solid rgba(222, 210, 189, 0.86);
  border-radius: 8px;
  object-fit: cover;
  box-shadow: var(--shadow);
}

/* ── Art Wall ── */
.art-wall {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.art-wall figure {
  position: relative;
  aspect-ratio: 4 / 3;
  min-height: 0;
  margin: 0;
  overflow: hidden;
  border: 1px solid rgba(222, 210, 189, 0.88);
  border-radius: 8px;
  background: #0e0d0b;
  box-shadow: var(--shadow);
}

.art-wall .feature-art {
  aspect-ratio: 4 / 3;
}

.art-wall img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.art-wall .feature-art img {
  object-fit: contain;
}

.art-wall figure::after {
  position: absolute;
  inset: auto 0 0;
  height: 46%;
  content: "";
  background: linear-gradient(180deg, transparent, rgba(0, 0, 0, 0.74));
}

.art-wall figcaption {
  position: absolute;
  z-index: 1;
  right: 18px;
  bottom: 16px;
  left: 18px;
  color: #fff;
  font-size: 14px;
  font-weight: 700;
}

.art-wall figcaption strong,
.art-wall figcaption span {
  display: block;
}

.art-wall figcaption strong {
  font-size: 18px;
  font-weight: 900;
}

.art-wall figcaption span {
  margin-top: 6px;
  color: rgba(255, 255, 255, 0.74);
  font-weight: 500;
}

/* ── Two-col ── */
.two-col {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: var(--section-gap);
  align-items: start;
}

.reason-grid,
.asset-grid,
.comparison,
.model-grid,
.value-grid {
  display: grid;
  gap: 18px;
}

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

.reason-grid article,
.comparison article,
.asset-grid article,
.model-grid article,
.value-grid article,
.use-of-funds,
.closing {
  background: rgba(255, 250, 240, 0.94);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.reason-grid article,
.comparison article {
  padding: 26px;
}

.reason-grid p,
.comparison p,
.asset-grid p {
  margin-bottom: 0;
}

.comparison p + p {
  margin-top: 18px;
}

.comparison strong {
  color: var(--ink);
  font-weight: 800;
}

/* ── Dark section ── */
.dark {
  background:
    radial-gradient(circle at 16% 12%, rgba(199, 160, 89, 0.16), transparent 30%),
    var(--charcoal);
  color: #fff;
}

.dark p {
  color: rgba(255, 255, 255, 0.72);
}

/* ── Asset Grid ── */
.asset-grid {
  grid-template-columns: repeat(4, 1fr);
}

.asset-grid article {
  min-height: auto;
  overflow: hidden;
  padding: 0 0 24px;
  background: #211f1c;
  border-color: rgba(255, 255, 255, 0.12);
  box-shadow: none;
}

/* 优化2: aspect-ratio */
.asset-grid article img {
  width: 100%;
  aspect-ratio: 4 / 3;
  margin-bottom: 22px;
  background: #090807;
  object-fit: contain;
}

.asset-grid .asset-card-tall img {
  aspect-ratio: 4 / 3;
  object-fit: contain;
}

.asset-grid article span,
.asset-grid article h3,
.asset-grid article p {
  margin-right: 24px;
  margin-left: 24px;
}

.asset-grid span {
  display: block;
  margin-bottom: 18px;
  color: var(--gold);
  font-weight: 800;
}

/* ── Split Proof ── */
.split-proof {
  display: grid;
  grid-template-columns: minmax(0, 520px) minmax(0, 600px);
  gap: var(--section-gap);
  justify-content: center;
  align-items: center;
  background: #fffaf0;
  width: 100%;
  padding-left: var(--page-gutter);
  padding-right: var(--page-gutter);
}

.image-stack {
  display: grid;
  grid-template-columns: 1fr 0.72fr;
  gap: 16px;
  align-items: end;
}

/* 优化2: aspect-ratio */
.image-stack img {
  width: 100%;
  border-radius: 8px;
  object-fit: cover;
  box-shadow: var(--shadow);
}

.image-stack img:first-child {
  aspect-ratio: 3 / 4;
}

.image-stack img:last-child {
  aspect-ratio: 3 / 3.5;
}

.check-list {
  display: grid;
  gap: 14px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.check-list li {
  padding: 16px 18px;
  background: #f8f1e6;
  border-left: 4px solid var(--red);
  border-radius: 6px;
  color: #3e3934;
  font-weight: 400;
  line-height: 1.6;
}

.check-list li strong {
  font-weight: 800;
}

/* ── Business Model ── */
.model {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.82), rgba(255, 250, 240, 0.92)),
    #fff;
}

.model-grid {
  grid-template-columns: repeat(3, 1fr);
}

.model-grid article {
  min-height: 180px;
  padding: 26px;
  background: #fff;
  box-shadow: none;
}

.model-grid small {
  color: var(--red);
  font-weight: 800;
}

.model-grid strong {
  display: block;
  margin-top: 18px;
  font-size: clamp(22px, 3vw, 32px);
  font-weight: 800;
  line-height: 1.1;
}

.model-grid span {
  display: block;
  margin-top: 12px;
  color: var(--muted);
  font-weight: 500;
}

.model-grid .highlight {
  background: var(--red);
  color: #fff;
  border-color: var(--red);
}

.model-grid .highlight small,
.model-grid .highlight span {
  color: rgba(255, 255, 255, 0.82);
}

/* ── Funding ── */
.funding,
.growth {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: var(--section-gap);
  align-items: center;
}

.use-of-funds {
  padding: 12px;
}

.use-of-funds h3 {
  margin: 0 14px 6px;
  color: var(--ink);
  font-size: 18px;
}

.use-of-funds div {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 14px;
  border-bottom: 1px solid var(--line);
}

.use-of-funds div:last-child {
  border-bottom: 0;
}

.use-of-funds span {
  color: #4c4740;
  font-weight: 500;
}

.use-of-funds strong {
  white-space: nowrap;
  color: var(--red);
  font-size: 20px;
  font-weight: 800;
}

/* ── Tiers ── */
.tiers {
  background:
    radial-gradient(circle at 84% 12%, rgba(199, 160, 89, 0.15), transparent 28%),
    #171511;
  color: #fff;
}

.tiers p {
  color: rgba(255, 255, 255, 0.72);
}

.tier-table {
  overflow: hidden;
  border: 1px solid rgba(222, 210, 189, 0.28);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.04);
}

.tier-row {
  display: grid;
  grid-template-columns: minmax(190px, 0.7fr) minmax(0, 1.5fr) minmax(260px, 1fr);
  border-bottom: 1px solid rgba(222, 210, 189, 0.22);
}

.tier-row:last-child {
  border-bottom: 0;
}

.tier-row > div {
  min-width: 0;
  padding: 18px 16px;
  border-right: 1px solid rgba(222, 210, 189, 0.18);
  color: rgba(255, 255, 255, 0.78);
  font-weight: 400;
}

.tier-row > div:last-child {
  border-right: 0;
}

.tier-head > div {
  background: rgba(199, 160, 89, 0.14);
  color: #fff;
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0.04em;
}

.tier-row strong {
  color: var(--gold);
  font-size: 22px;
  font-weight: 800;
}

.tier-row > div:first-child span {
  display: block;
  margin-top: 10px;
  color: rgba(255, 255, 255, 0.82);
  font-size: 16px;
  font-weight: 700;
}

.premium-tier {
  background: rgba(255, 255, 255, 0.035);
}

.tier-list {
  display: grid;
  gap: 8px;
  margin: 0;
  padding-left: 18px;
}

.tier-list li {
  color: rgba(255, 255, 255, 0.78);
  font-weight: 400;
  line-height: 1.55;
}

.compact-list {
  gap: 7px;
}

/* ── Growth ── */
.growth {
  background:
    linear-gradient(90deg, rgba(0, 0, 0, 0.1), transparent),
    var(--charcoal);
  color: #fff;
  grid-template-columns: minmax(0, 520px) minmax(0, 600px);
  justify-content: center;
  width: 100%;
  padding-left: var(--page-gutter);
  padding-right: var(--page-gutter);
}

/* 优化2: aspect-ratio */
.growth img {
  width: 100%;
  aspect-ratio: 3 / 4;
  border-radius: 8px;
  object-fit: cover;
  box-shadow: none;
}

.growth p,
.growth li {
  color: rgba(255, 255, 255, 0.76);
  font-weight: 400;
}

.growth ol {
  display: grid;
  gap: 16px;
  margin: 26px 0 0;
  padding-left: 24px;
}

.growth strong {
  color: #fff;
  font-weight: 800;
}

/* ── Value Grid ── */
.value-grid {
  grid-template-columns: repeat(3, 1fr);
}

.value-grid article {
  min-height: 220px;
  display: grid;
  align-content: start;
  gap: 16px;
  padding: 24px;
  background: #fff;
  color: #2d2924;
  box-shadow: none;
}

.value-grid span {
  display: inline-flex;
  width: 34px;
  height: 34px;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--red);
  color: #fff;
  font-weight: 800;
}

.value-grid h3 {
  margin: 0;
  font-size: 24px;
  font-weight: 900;
}

.value-grid p {
  margin: 0;
  color: var(--muted);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.65;
}

/* ── Closing CTA - 优化6: 更突出 ── */
.closing {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 32px;
  width: min(var(--max-w), calc(100% - (var(--page-gutter) * 2)));
  max-width: none;
  margin: 0 auto 64px;
  padding: clamp(36px, 6vw, 64px) clamp(24px, 5vw, 52px);
  background: linear-gradient(135deg, var(--charcoal) 0%, #1a1812 100%);
  border-color: rgba(199, 160, 89, 0.3);
  color: #fff;
}

.closing .eyebrow {
  color: var(--gold);
}

.closing h2 {
  color: #fff;
  font-size: clamp(28px, 4.5vw, 46px);
}

.closing p {
  margin-bottom: 0;
  color: rgba(255, 255, 255, 0.68);
  font-weight: 500;
}

.contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}

.contact-actions .button.primary {
  min-width: 240px;
  font-size: 16px;
}

.contact-actions span {
  display: flex;
  min-height: 50px;
  align-items: center;
  justify-content: center;
  padding: 12px 20px;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 6px;
  background: transparent;
  color: #fff;
  font-weight: 800;
}

/* ── Footer ── */
.footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 24px var(--content-side);
  background: #050505;
  color: rgba(255, 255, 255, 0.74);
  font-weight: 400;
}

/* ══════════════════════════════
   Responsive: Tablet (≤1080px)
   ══════════════════════════════ */
@media (max-width: 1080px) {
  .proof-strip,
  .asset-grid,
  .model-grid,
  .value-grid,
  .art-wall {
    grid-template-columns: repeat(2, 1fr);
  }

  .art-wall .feature-art {
    aspect-ratio: 4 / 3;
  }

  .conclusion,
  .two-col,
  .split-proof,
  .funding,
  .growth {
    grid-template-columns: 1fr;
  }

  .tier-row {
    grid-template-columns: 1fr;
  }

  .tier-head {
    display: none;
  }

  .tier-row > div {
    display: grid;
    grid-template-columns: 110px 1fr;
    gap: 14px;
    border-right: 0;
  }

  .tier-row > div::before {
    color: var(--gold);
    font-size: 13px;
    font-weight: 800;
  }

  .tier-row > div:nth-child(1)::before {
    content: "投资档位";
  }

  .tier-row > div:nth-child(2)::before {
    content: "核心权益";
  }

  .tier-row > div:nth-child(3)::before {
    content: "退出与消费机制";
  }

  html[lang="en"] .tier-row > div:nth-child(1)::before {
    content: "Tier";
  }

  html[lang="en"] .tier-row > div:nth-child(2)::before {
    content: "Core benefits";
  }

  html[lang="en"] .tier-row > div:nth-child(3)::before {
    content: "Exit / use";
  }
}

/* ══════════════════════════════
   Responsive: Mobile (≤760px)
   优化5: 汉堡菜单 + 全面手机优化
   ══════════════════════════════ */
@media (max-width: 760px) {
  .site-header {
    grid-template-columns: 1fr auto auto;
    gap: 10px;
    min-height: auto;
    padding: 12px 16px;
  }

  .language-switcher {
    justify-self: end;
    width: 116px;
  }

  .language-switcher button {
    min-height: 30px;
    padding: 4px 8px;
  }

  /* 优化5: 汉堡菜单 */
  .menu-toggle {
    display: flex;
  }

  .nav {
    display: flex;
    grid-column: 1 / -1;
    grid-row: 2;
    flex-direction: column;
    gap: 0;
    max-height: 0;
    padding: 0;
    border-top: 1px solid rgba(255,255,255,0.12);
    opacity: 0;
    overflow: hidden;
    pointer-events: none;
    transform: translateY(-6px);
    transition: max-height 0.28s ease, opacity 0.2s ease, padding 0.28s ease, transform 0.28s ease;
  }

  .nav.open {
    max-height: 360px;
    padding: 8px 0 4px;
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }

  .nav a {
    display: block;
    padding: 12px 0;
    font-size: 15px;
    border-bottom: 1px solid rgba(255,255,255,0.06);
  }

  .nav a:last-child {
    border-bottom: 0;
  }

  .header-cta {
    display: none;
  }

  .brand span {
    font-size: 18px;
  }

  .hero {
    min-height: calc(100svh - 62px);
  }

  .hero-shade {
    background: linear-gradient(180deg, rgba(0, 0, 0, 0.15), rgba(0, 0, 0, 0.88));
  }

  .hero-content {
    width: calc(100% - 32px);
    padding-top: 80px;
    padding-bottom: 48px;
  }

  .hero h1 {
    font-size: 28px;
    line-height: 1.18;
    word-break: normal;
    overflow-wrap: anywhere;
  }

  .desktop-title {
    display: none;
  }

  .mobile-title {
    display: inline;
  }

  .hero-copy {
    font-size: 15px;
    line-height: 1.65;
  }

  .hero-kicker {
    max-width: 100%;
    white-space: normal;
    line-height: 1.35;
    font-size: 11px;
  }

  .button {
    width: 100%;
    min-height: 48px;
    font-size: 15px;
  }

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

  .proof-strip article {
    padding: 22px 18px;
    border-right: 0;
  }

  .proof-strip article:nth-child(odd) {
    border-right: 1px solid rgba(255, 255, 255, 0.12);
  }

  .proof-strip article:nth-child(-n+2) {
    border-bottom: 1px solid rgba(255, 255, 255, 0.12);
  }

  .proof-strip strong {
    font-size: 32px;
  }

  .proof-strip span {
    font-size: 13px;
  }

  .section {
    padding: 52px 18px;
  }

  .section h2,
  .closing h2 {
    font-size: 24px;
    line-height: 1.2;
  }

  .section h3 {
    font-size: 18px;
  }

  .conclusion > p {
    font-size: 16px;
  }

  .reason-grid,
  .asset-grid,
  .model-grid,
  .value-grid,
  .media-band,
  .image-stack,
  .art-wall,
  .comparison {
    grid-template-columns: 1fr;
  }

  /* 优化2: 手机端也用 aspect-ratio */
  .media-band img {
    aspect-ratio: 16 / 10;
  }

  .image-stack img:first-child {
    aspect-ratio: 16 / 10;
  }

  .image-stack img:last-child {
    aspect-ratio: 16 / 10;
  }

  .art-wall figure {
    aspect-ratio: 4 / 3;
  }

  .art-wall .feature-art {
    aspect-ratio: 4 / 3;
  }

  .growth img {
    aspect-ratio: 16 / 10;
  }

  .asset-grid article {
    min-height: auto;
  }

  .asset-grid article img {
    aspect-ratio: 4 / 3;
    height: auto;
  }

  .reason-grid article,
  .comparison article {
    padding: 22px;
  }

  .model-grid article {
    min-height: auto;
    padding: 22px;
  }

  .model-grid strong {
    font-size: 22px;
  }

  .check-list li {
    padding: 14px 16px;
    font-size: 15px;
  }

  .use-of-funds div {
    flex-direction: row;
    align-items: center;
  }

  .use-of-funds span {
    font-size: 14px;
  }

  .use-of-funds strong {
    font-size: 18px;
  }

  .closing {
    margin: 0 16px 48px;
    padding: 36px 22px;
    border-radius: 12px;
  }

  .closing h2 {
    font-size: 24px;
  }

  .contact-actions {
    flex-direction: column;
    width: 100%;
  }

  .contact-actions .button.primary {
    min-width: auto;
    width: 100%;
  }

  .footer {
    flex-direction: column;
    align-items: center;
    gap: 12px;
    text-align: center;
    font-size: 14px;
  }

  .tier-row > div {
    grid-template-columns: 86px 1fr;
    padding: 14px;
  }

  .tier-row strong {
    font-size: 18px;
  }

  .tier-row > div:first-child span {
    font-size: 14px;
  }

  .value-grid article {
    min-height: auto;
    padding: 20px;
  }

  .value-grid h3 {
    font-size: 20px;
  }
}

/* ── Extra small (≤400px) ── */
@media (max-width: 400px) {
  .hero h1 {
    font-size: 24px;
  }

  .proof-strip strong {
    font-size: 28px;
  }

  .section h2,
  .closing h2 {
    font-size: 22px;
  }
}