:root {
  --brand: #d9461e;
  --brand-dark: #a83216;
  --brand-soft: #fff2ec;
  --sun: #f5a524;
  --forest: #20745f;
  --lake: #1673a7;
  --blue: #2f66d0;
  --violet: #6257c8;
  --ink: #121821;
  --text: #303846;
  --muted: #667487;
  --line: #dfe5ec;
  --paper: #ffffff;
  --soft: #f5f7fa;
  --night: #111923;
  --max: 1240px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
}

body {
  margin: 0;
  color: var(--text);
  background: var(--soft);
  font-family:
    "Microsoft YaHei",
    "PingFang SC",
    "Noto Sans CJK SC",
    Arial,
    sans-serif;
  line-height: 1.6;
}

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

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

button {
  font: inherit;
}

:focus-visible {
  outline: 3px solid rgba(245, 165, 36, 0.96);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 10px;
  left: 10px;
  padding: 10px 14px;
  color: white;
  border-radius: 6px;
  background: var(--brand-dark);
  transform: translateY(-160%);
}

.skip-link:focus {
  transform: translateY(0);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.site-header {
  position: fixed;
  z-index: 20;
  top: 0;
  left: 0;
  right: 0;
  height: 76px;
  padding: 0 max(20px, calc((100% - var(--max)) / 2));
  color: white;
  transition:
    background 180ms ease,
    color 180ms ease,
    border-color 180ms ease;
}

.site-header-inner {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 24px;
  height: 100%;
}

.site-header.is-scrolled {
  color: var(--ink);
  border-bottom: 1px solid rgba(223, 229, 236, 0.92);
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(16px);
}

.header-actions {
  display: flex;
  align-items: center;
  justify-self: end;
  gap: 10px;
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  padding: 9px;
  border: 1px solid rgba(255, 255, 255, 0.38);
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.08);
  cursor: pointer;
}

.nav-toggle > span:not(.sr-only) {
  display: block;
  width: 100%;
  height: 2px;
  margin: 4px 0;
  border-radius: 999px;
  background: currentColor;
}

.site-header.is-scrolled .nav-toggle {
  border-color: var(--line);
  background: white;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
  font-size: 17px;
  font-weight: 900;
}

.brand-mark {
  position: relative;
  flex: 0 0 auto;
  width: 36px;
  height: 36px;
  overflow: hidden;
  border-radius: 8px;
  background:
    linear-gradient(135deg, #ffb24d 0%, var(--brand) 48%, var(--brand-dark) 100%);
  box-shadow: 0 14px 30px rgba(217, 70, 30, 0.28);
}

.brand-mark::before,
.brand-mark::after {
  position: absolute;
  content: "";
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.86);
}

.brand-mark::before {
  left: 9px;
  top: 7px;
  width: 7px;
  height: 22px;
  box-shadow: 11px 0 0 rgba(255, 255, 255, 0.36);
}

.brand-mark::after {
  left: 7px;
  right: 7px;
  top: 15px;
  height: 7px;
  background: rgba(255, 255, 255, 0.46);
}

.site-nav {
  display: flex;
  gap: 24px;
  font-size: 14px;
  font-weight: 800;
}

.site-nav a,
.header-action {
  opacity: 0.88;
}

.site-nav a:hover,
.header-action:hover,
.site-nav a[aria-current="true"] {
  opacity: 1;
}

.site-nav a[aria-current="true"] {
  color: #ffb05e;
}

.site-header.is-scrolled .site-nav a[aria-current="true"] {
  color: var(--brand);
}

.header-action {
  justify-self: end;
  padding: 9px 15px;
  border: 1px solid rgba(255, 255, 255, 0.48);
  border-radius: 6px;
  font-size: 14px;
  font-weight: 900;
}

.site-header.is-scrolled .header-action {
  color: var(--brand);
  border-color: rgba(217, 70, 30, 0.24);
  background: var(--brand-soft);
}

.hero {
  position: relative;
  display: grid;
  align-items: center;
  min-height: 86svh;
  overflow: hidden;
  padding: 116px max(20px, calc((100% - var(--max)) / 2)) 54px;
  color: white;
  background: var(--night);
}

.hero-media,
.hero-shade {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.hero-media {
  object-fit: cover;
  object-position: center center;
  opacity: 0.96;
}

.hero-shade {
  background:
    linear-gradient(90deg, rgba(9, 14, 21, 0.96) 0%, rgba(9, 14, 21, 0.86) 38%, rgba(9, 14, 21, 0.24) 100%),
    linear-gradient(0deg, rgba(9, 14, 21, 0.78) 0%, rgba(9, 14, 21, 0.08) 50%);
}

.hero-inner {
  position: relative;
  width: min(790px, 100%);
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--brand);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0;
}

.hero .eyebrow,
.platform-band .eyebrow {
  color: #ffb05e;
}

.hero h1,
.section h2,
.intro-copy h2,
.value-band h2,
.platform-copy h2,
.dianyouxi-band h2,
.screen-band h2,
.roadmap h2 {
  margin: 0;
  color: inherit;
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: 0;
}

.intro-copy > p:not(.eyebrow) {
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 18px;
}

.hero h1 {
  max-width: 760px;
  font-size: 66px;
}

.hero-copy {
  max-width: 720px;
  margin: 24px 0 0;
  color: rgba(255, 255, 255, 0.84);
  font-size: 21px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.primary-action,
.secondary-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 12px 18px;
  border-radius: 6px;
  font-weight: 900;
}

.primary-action {
  color: white;
  background: var(--brand);
  box-shadow: 0 18px 34px rgba(217, 70, 30, 0.32);
}

.secondary-action {
  color: white;
  border: 1px solid rgba(255, 255, 255, 0.34);
  background: rgba(255, 255, 255, 0.09);
}

.signal-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0;
  width: min(820px, 100%);
  margin: 46px 0 0;
  border-top: 1px solid rgba(255, 255, 255, 0.24);
  border-bottom: 1px solid rgba(255, 255, 255, 0.24);
}

.signal-strip div {
  min-width: 0;
  padding: 16px 18px;
  border-left: 1px solid rgba(255, 255, 255, 0.18);
}

.signal-strip div:first-child {
  border-left: 0;
  padding-left: 0;
}

.signal-strip dt {
  color: rgba(255, 255, 255, 0.64);
  font-size: 13px;
  font-weight: 800;
}

.signal-strip dd {
  margin: 4px 0 0;
  color: white;
  font-family: Aptos, Arial, sans-serif;
  font-size: 30px;
  font-weight: 900;
  line-height: 1.08;
}

.intro-band,
.section,
.value-band,
.platform-band,
.dianyouxi-band,
.screen-band,
.roadmap {
  width: min(var(--max), calc(100% - 40px));
  margin: 0 auto;
}

.intro-band {
  display: grid;
  grid-template-columns: minmax(320px, 0.78fr) minmax(0, 1.22fr);
  gap: 36px;
  align-items: start;
  padding: 64px 0 84px;
}

.intro-copy h2,
.section h2,
.value-band h2,
.dianyouxi-band h2,
.screen-band h2 {
  color: var(--ink);
  font-size: 46px;
}

.section-heading {
  max-width: 860px;
  margin-bottom: 34px;
}

.section-heading > p:not(.eyebrow),
.platform-copy > p:not(.eyebrow),
.roadmap p {
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 18px;
}

.intro-flow {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.intro-flow article,
.source-grid article,
.decision-list article,
.loop-grid article,
.benefit-grid article {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
}

.intro-flow article {
  min-height: 246px;
  padding: 22px;
}

.intro-flow span,
.source-index {
  display: inline-block;
  color: var(--brand);
  font-family: Aptos, Arial, sans-serif;
  font-size: 34px;
  font-weight: 900;
  line-height: 1;
}

.intro-flow h3,
.source-grid h3,
.decision-list h3,
.loop-grid h3,
.benefit-grid h3,
.screen-stage h3 {
  margin: 0;
  color: var(--ink);
  font-weight: 900;
}

.intro-flow h3 {
  margin-top: 22px;
  font-size: 23px;
}

.intro-flow p,
.source-grid p,
.decision-list p,
.loop-grid p,
.benefit-grid p,
.screen-stage aside p:last-child {
  color: var(--muted);
}

.section {
  padding: 88px 0;
}

.sources {
  padding-top: 94px;
}

.source-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.source-grid article {
  min-height: 236px;
  padding: 24px;
  box-shadow: 0 20px 42px rgba(18, 24, 33, 0.06);
}

.source-grid article:nth-child(2) .source-index { color: var(--blue); }
.source-grid article:nth-child(3) .source-index { color: var(--forest); }
.source-grid article:nth-child(4) .source-index { color: var(--violet); }
.source-grid article:nth-child(5) .source-index { color: var(--sun); }
.source-grid article:nth-child(6) .source-index { color: #2f7d3c; }
.source-grid article:nth-child(7) .source-index { color: var(--brand-dark); }
.source-grid article:nth-child(8) .source-index { color: var(--lake); }

.source-grid h3,
.benefit-grid h3 {
  margin-top: 22px;
  font-size: 22px;
  line-height: 1.25;
}

.capability-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.capability-grid article {
  min-height: 250px;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
  box-shadow: 0 20px 42px rgba(18, 24, 33, 0.06);
}

.capability-grid h3 {
  margin: 24px 0 0;
  color: var(--ink);
  font-size: 24px;
  font-weight: 900;
  line-height: 1.25;
}

.capability-grid p {
  margin: 12px 0 0;
  color: var(--muted);
}

.capability-status {
  display: inline-flex;
  padding: 6px 9px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 900;
}

.capability-status.is-foundation {
  color: #17624f;
  background: #e6f5ef;
}

.capability-status.is-evolving {
  color: #a23a1b;
  background: var(--brand-soft);
}

.value-band {
  max-width: none;
  width: 100%;
  padding: 90px max(20px, calc((100% - var(--max)) / 2));
  background: white;
}

.value-table {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: white;
  box-shadow: 0 24px 52px rgba(18, 24, 33, 0.08);
}

.value-row {
  display: grid;
  grid-template-columns: 0.5fr 1.2fr 1.3fr;
  gap: 18px;
  padding: 20px 24px;
  border-top: 1px solid var(--line);
}

.value-row:first-child {
  border-top: 0;
}

.value-row span:first-child {
  color: var(--ink);
  font-weight: 900;
}

.value-head {
  color: white;
  background: var(--night);
  font-weight: 900;
}

.value-head span:first-child {
  color: white;
}

.platform-band {
  display: grid;
  grid-template-columns: minmax(320px, 0.9fr) minmax(0, 1.1fr);
  gap: 44px;
  align-items: center;
  max-width: none;
  width: 100%;
  padding: 94px max(20px, calc((100% - var(--max)) / 2));
  color: white;
  background:
    linear-gradient(135deg, rgba(17, 25, 35, 0.98), rgba(28, 40, 53, 0.98)),
    var(--night);
}

.platform-copy h2 {
  max-width: 700px;
  font-size: 48px;
}

.platform-copy > p:not(.eyebrow) {
  color: rgba(255, 255, 255, 0.75);
  font-size: 18px;
}

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

.platform-tags span {
  padding: 9px 12px;
  color: #ffd6c6;
  border: 1px solid rgba(217, 70, 30, 0.42);
  border-radius: 6px;
  background: rgba(217, 70, 30, 0.12);
  font-weight: 900;
}

.status-note {
  margin-top: 22px !important;
  padding: 14px 16px;
  color: rgba(255, 255, 255, 0.82) !important;
  border-left: 3px solid #ffb05e;
  background: rgba(255, 255, 255, 0.06);
  font-size: 14px !important;
}

.platform-visual,
.decision-visual,
.screen-stage figure {
  overflow: hidden;
  margin: 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: white;
  box-shadow: 0 28px 62px rgba(18, 24, 33, 0.14);
}

.platform-visual {
  border-color: rgba(255, 255, 255, 0.16);
}

.platform-visual img,
.decision-visual img {
  width: 100%;
}

.decision-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.12fr) minmax(340px, 0.88fr);
  gap: 26px;
  align-items: center;
}

.decision-list {
  display: grid;
  gap: 12px;
}

.decision-list article {
  padding: 22px;
}

.decision-list h3 {
  font-size: 22px;
}

.decision-list p {
  margin: 8px 0 0;
}

.dianyouxi-band {
  max-width: none;
  width: 100%;
  padding: 92px max(20px, calc((100% - var(--max)) / 2));
  background: #eef5f2;
}

.loop-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 14px;
}

.loop-grid article {
  min-height: 236px;
  padding: 24px;
}

.loop-grid span {
  display: inline-grid;
  place-items: center;
  width: 38px;
  height: 38px;
  margin-bottom: 18px;
  color: white;
  border-radius: 50%;
  background: var(--forest);
  font-weight: 900;
}

.loop-grid article:nth-child(2) span { background: var(--blue); }
.loop-grid article:nth-child(3) span { background: var(--sun); }
.loop-grid article:nth-child(4) span { background: var(--brand); }
.loop-grid article:nth-child(5) span { background: var(--lake); }

.delivery-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.loop-grid h3 {
  font-size: 23px;
}

.benefit-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.benefit-grid article {
  min-height: 178px;
  padding: 26px;
}

.screen-band {
  max-width: none;
  width: 100%;
  padding: 92px max(20px, calc((100% - var(--max)) / 2));
  background: white;
}

.screen-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 22px;
}

.screen-tabs button {
  min-height: 38px;
  padding: 8px 13px;
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 6px;
  background: white;
  font-size: 14px;
  font-weight: 900;
  cursor: pointer;
}

.screen-tabs button.is-active {
  color: white;
  border-color: var(--brand);
  background: var(--brand);
}

.screen-stage {
  display: grid;
  grid-template-columns: minmax(0, 1.42fr) minmax(280px, 0.58fr);
  gap: 22px;
  align-items: stretch;
}

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

.screen-stage aside {
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f8fafc;
}

.screen-stage h3 {
  font-size: 30px;
  line-height: 1.18;
}

.roadmap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  margin-top: 78px;
  margin-bottom: 60px;
  padding: 42px;
  border-radius: 8px;
  color: white;
  background:
    linear-gradient(135deg, rgba(217, 70, 30, 0.96), rgba(32, 116, 95, 0.94)),
    var(--brand);
}

.roadmap h2 {
  font-size: 38px;
}

.roadmap p {
  max-width: 850px;
  color: rgba(255, 255, 255, 0.84);
}

.roadmap .eyebrow {
  color: #ffe1c4;
}

.roadmap .primary-action {
  flex: 0 0 auto;
  color: var(--brand);
  background: white;
  box-shadow: none;
}

.roadmap-actions {
  display: flex;
  flex: 0 0 auto;
  flex-direction: column;
  gap: 10px;
  min-width: 156px;
}

.roadmap-actions .secondary-action {
  border-color: rgba(255, 255, 255, 0.5);
}

.site-footer {
  border-top: 1px solid var(--line);
  background: white;
}

.site-footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  width: min(var(--max), calc(100% - 40px));
  margin: 0 auto;
  padding: 28px 0;
  color: var(--muted);
}

.footer-brand,
.footer-links {
  display: flex;
  gap: 8px 18px;
}

.footer-brand {
  flex-direction: column;
}

.footer-brand strong {
  color: var(--ink);
}

.footer-links {
  align-items: center;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.footer-links a:hover {
  color: var(--brand);
}

@media (max-width: 1120px) {
  .intro-band,
  .platform-band,
  .decision-layout,
  .screen-stage {
    grid-template-columns: 1fr;
  }

  .intro-flow,
  .source-grid,
  .capability-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .loop-grid,
  .delivery-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 920px) {
  .site-header-inner {
    grid-template-columns: 1fr auto;
  }

  .site-nav {
    position: absolute;
    top: 66px;
    left: max(20px, calc((100% - var(--max)) / 2));
    right: max(20px, calc((100% - var(--max)) / 2));
    display: none;
    gap: 0;
    padding: 8px;
    color: var(--ink);
    border: 1px solid var(--line);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 22px 50px rgba(18, 24, 33, 0.18);
  }

  .site-nav.is-open {
    display: grid;
  }

  .site-nav a {
    padding: 11px 12px;
    border-radius: 5px;
  }

  .site-nav a:hover,
  .site-nav a[aria-current="true"] {
    color: var(--brand);
    background: var(--brand-soft);
  }

  .nav-toggle {
    display: block;
  }

  .hero {
    min-height: 84svh;
  }

  .hero h1 {
    font-size: 50px;
  }

  .intro-copy h2,
  .section h2,
  .value-band h2,
  .platform-copy h2,
  .dianyouxi-band h2,
  .screen-band h2 {
    font-size: 36px;
  }

  .benefit-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .value-row {
    grid-template-columns: 0.7fr 1.1fr 1.2fr;
  }

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

  .roadmap-actions {
    width: 100%;
    flex-direction: row;
  }

  .roadmap-actions a {
    flex: 1;
  }
}

@media (max-width: 640px) {
  .site-header {
    height: 64px;
    padding-left: 16px;
    padding-right: 16px;
  }

  .brand span:last-child {
    max-width: 9em;
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
  }

  .header-action {
    padding: 8px 10px;
    font-size: 13px;
  }

  .nav-toggle {
    width: 38px;
    height: 38px;
    padding: 8px;
  }

  .site-nav {
    top: 58px;
    left: 16px;
    right: 16px;
  }

  .hero {
    min-height: auto;
    padding: 92px 18px 42px;
  }

  .hero-media {
    object-position: 60% center;
  }

  .hero-shade {
    background:
      linear-gradient(90deg, rgba(9, 14, 21, 0.96) 0%, rgba(9, 14, 21, 0.85) 58%, rgba(9, 14, 21, 0.42) 100%),
      linear-gradient(0deg, rgba(9, 14, 21, 0.88) 0%, rgba(9, 14, 21, 0.18) 54%);
  }

  .hero h1 {
    font-size: 36px;
  }

  .hero-copy {
    font-size: 17px;
  }

  .hero-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .primary-action,
  .secondary-action {
    width: 100%;
  }

  .signal-strip {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    margin-top: 30px;
  }

  .signal-strip div {
    padding: 13px 10px;
  }

  .signal-strip div:nth-child(3) {
    border-left: 0;
  }

  .signal-strip dd {
    font-size: 24px;
  }

  .intro-band,
  .section,
  .value-band,
  .platform-band,
  .dianyouxi-band,
  .screen-band {
    width: 100%;
    padding: 64px 16px;
  }

  .intro-flow,
  .source-grid,
  .capability-grid,
  .loop-grid,
  .benefit-grid {
    grid-template-columns: 1fr;
  }

  .intro-copy h2,
  .section h2,
  .value-band h2,
  .platform-copy h2,
  .dianyouxi-band h2,
  .screen-band h2 {
    font-size: 30px;
  }

  .value-row {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .screen-tabs {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .screen-tabs button {
    width: 100%;
    padding-left: 8px;
    padding-right: 8px;
  }

  .screen-stage img {
    min-height: auto;
    aspect-ratio: 16 / 10;
  }

  .screen-stage aside,
  .roadmap {
    padding: 24px;
  }

  .roadmap {
    width: calc(100% - 32px);
    margin-top: 54px;
  }

  .roadmap h2 {
    font-size: 28px;
  }

  .site-footer-inner {
    flex-direction: column;
    width: calc(100% - 32px);
  }

  .footer-links {
    align-items: flex-start;
    flex-direction: column;
  }

  .roadmap-actions {
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}