:root {
  --bg: #0f1720;
  --bg-soft: #162332;
  --card: rgba(248, 241, 230, 0.08);
  --card-strong: rgba(248, 241, 230, 0.12);
  --text: #f8f1e6;
  --muted: #dccfb9;
  --line: rgba(248, 241, 230, 0.16);
  --gold: #d7b879;
  --jade: #83c5a3;
  --peach: #f0b58d;
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.28);
  --radius-xl: 28px;
  --radius-lg: 22px;
  --radius-md: 16px;
  --max-width: 1220px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  overflow-x: hidden;
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(131, 197, 163, 0.16), transparent 28%),
    radial-gradient(circle at top right, rgba(240, 181, 141, 0.16), transparent 24%),
    linear-gradient(180deg, #091018 0%, #0f1720 38%, #132235 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.3), black 30%, rgba(0, 0, 0, 0.4));
}

a {
  color: inherit;
  text-decoration: none;
  overflow-wrap: anywhere;
}

img,
svg {
  max-width: 100%;
}

button {
  font: inherit;
}

.page-shell {
  position: relative;
  width: min(calc(100% - 40px), var(--max-width));
  margin: 0 auto;
  padding-bottom: 56px;
}

.section {
  position: relative;
  z-index: 1;
}

.site-header {
  position: sticky;
  top: 18px;
  z-index: 10;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 20px;
  margin-top: 18px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(9, 16, 24, 0.66);
  backdrop-filter: blur(20px);
  box-shadow: var(--shadow);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
}

.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: 1px solid rgba(215, 184, 121, 0.28);
  color: var(--gold);
  font-weight: 800;
  letter-spacing: 0.08em;
  background: radial-gradient(circle, rgba(215, 184, 121, 0.15), transparent 68%);
}

.brand-copy {
  display: grid;
  gap: 2px;
}

.brand-copy strong {
  font-size: 0.98rem;
  font-weight: 800;
}

.brand-copy small {
  color: rgba(248, 241, 230, 0.72);
  font-size: 0.78rem;
}

.site-nav {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 18px;
}

.site-nav a {
  position: relative;
  color: rgba(248, 241, 230, 0.84);
  font-size: 0.92rem;
}

.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -5px;
  width: 100%;
  height: 1px;
  transform: scaleX(0);
  transform-origin: left;
  background: var(--gold);
  transition: transform 180ms ease;
}

.site-nav a:hover::after,
.site-nav a:focus-visible::after {
  transform: scaleX(1);
}

.header-cta,
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 18px;
  border-radius: 999px;
  font-weight: 700;
  transition:
    transform 180ms ease,
    background 180ms ease,
    color 180ms ease,
    border-color 180ms ease;
}

.header-cta,
.button-primary {
  color: #0d131c;
  background: linear-gradient(135deg, var(--gold), #f4d9a3);
}

.header-cta:hover,
.button:hover,
.header-cta:focus-visible,
.button:focus-visible {
  transform: translateY(-2px);
}

.button-secondary {
  border: 1px solid rgba(248, 241, 230, 0.2);
  background: rgba(248, 241, 230, 0.04);
  color: var(--text);
}

.hero {
  display: block;
  padding: 88px 0 32px;
}

.hero-visual,
.platform-card,
.materials-card,
.closing-card,
.stats-band article,
.roadmap-grid article,
.content-grid article,
.faq-item {
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(248, 241, 230, 0.08), rgba(248, 241, 230, 0.04));
  box-shadow: var(--shadow);
}

.eyebrow {
  margin: 0 0 18px;
  color: var(--gold);
  font-size: 0.84rem;
  font-weight: 800;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.hero h1,
.section-heading h2,
.closing-card h2 {
  margin: 0;
  font-family: "Songti SC", "STSong", "SimSun", serif;
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

.hero h1 {
  max-width: 12ch;
  font-size: clamp(2.8rem, 6vw, 5.4rem);
}

.hero-side-intro h2 {
  margin: 0;
  font-family: "Songti SC", "STSong", "SimSun", serif;
  font-size: clamp(1.9rem, 3vw, 3.1rem);
  line-height: 1.14;
  letter-spacing: -0.02em;
}

.hero-side-intro p {
  margin: 0;
  color: rgba(248, 241, 230, 0.76);
  line-height: 1.72;
}

.hero-text,
.section-heading p,
.platform-card p,
.platform-card li,
.roadmap-grid p,
.materials-card p,
.materials-card li,
.faq-content p,
.content-grid p,
.closing-card p {
  color: rgba(248, 241, 230, 0.78);
  line-height: 1.75;
  font-size: 1rem;
}

.hero-text {
  max-width: 58ch;
  margin: 26px 0 0;
  font-size: 1.06rem;
}

.hero-note {
  max-width: 52ch;
  margin: 18px 0 0;
  color: rgba(248, 241, 230, 0.62);
  line-height: 1.72;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 30px;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.hero-tags li {
  padding: 10px 14px;
  border: 1px solid rgba(248, 241, 230, 0.12);
  border-radius: 999px;
  color: var(--muted);
  background: rgba(248, 241, 230, 0.04);
}

.hero-proof span,
.roadmap-grid article > span {
  display: inline-grid;
  place-items: center;
  width: 52px;
  height: 52px;
  border-radius: 16px;
  color: #101821;
  font-weight: 800;
  background: linear-gradient(135deg, var(--jade), #c9eddb);
}

.hero-proof strong,
.roadmap-grid h3,
.materials-card h3,
.platform-card h3,
.content-grid h3 {
  display: block;
  margin-bottom: 8px;
  font-size: 1.08rem;
}

.hero-visual {
  display: grid;
  gap: 18px;
  align-content: start;
  padding: 28px;
  border-radius: var(--radius-xl);
  background:
    linear-gradient(180deg, rgba(15, 23, 32, 0.5), rgba(15, 23, 32, 0.84)),
    radial-gradient(circle at top right, rgba(215, 184, 121, 0.16), transparent 34%);
}

.hero-side-intro {
  display: grid;
  gap: 14px;
}

.hero-feature-row {
  display: grid;
  grid-template-columns: minmax(300px, 0.92fr) minmax(0, 1.28fr);
  gap: 22px;
  align-items: start;
}

.hero-feature-row > *,
.stats-band > *,
.platform-grid > *,
.roadmap-grid > *,
.materials-grid > * {
  min-width: 0;
}

.hero-feature-col {
  display: grid;
  gap: 14px;
  align-content: start;
}

.hero-proof {
  display: grid;
  gap: 12px;
}

.hero-proof article {
  display: grid;
  grid-template-columns: 52px 1fr;
  gap: 14px;
  align-items: start;
  padding: 16px;
  border-radius: 18px;
  border: 1px solid rgba(248, 241, 230, 0.08);
  background: rgba(248, 241, 230, 0.04);
}

.hero-proof p {
  margin: 0;
  color: rgba(248, 241, 230, 0.72);
  line-height: 1.65;
}

.hero-embed-frame {
  margin: 0;
  width: 100%;
  overflow: hidden;
  align-self: start;
  border: 1px solid rgba(248, 241, 230, 0.12);
  border-radius: 24px;
  background:
    radial-gradient(circle at top right, rgba(215, 184, 121, 0.16), transparent 36%),
    rgba(248, 241, 230, 0.03);
}

.hero-embed-image {
  display: block;
  width: 100%;
  height: auto;
}

.stats-band {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  margin-top: 10px;
}

.stats-band article {
  padding: 22px 20px;
  border-radius: var(--radius-md);
}

.stats-band span {
  display: block;
  margin-bottom: 12px;
  color: var(--gold);
  font-size: 0.84rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.stats-band strong {
  display: block;
  font-size: 1rem;
  line-height: 1.55;
}

.section-heading-block,
.roadmap,
.materials,
.warning-section,
.content-plan {
  padding-top: 80px;
}

.official-links-groups {
  display: grid;
  gap: 28px;
  margin-top: 28px;
}

.links-group {
  display: grid;
  gap: 18px;
}

.links-group-head {
  display: grid;
  gap: 10px;
}

.links-group-head h3 {
  margin: 0;
  font-size: 1.22rem;
}

.section-heading {
  display: grid;
  gap: 12px;
  max-width: 760px;
}

.section-heading-wide {
  max-width: 100%;
}

.section-heading-wide h2 {
  white-space: nowrap;
  font-size: clamp(1.9rem, 3vw, 3rem);
}

.section-heading-wide > p:not(.eyebrow) {
  max-width: 760px;
}

.section-heading h2,
.closing-card h2 {
  font-size: clamp(2rem, 3.5vw, 3.5rem);
}

.category-switch {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
  padding: 8px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(248, 241, 230, 0.04);
}

.category-switch button {
  min-height: 44px;
  padding: 0 18px;
  border: 0;
  border-radius: 999px;
  color: rgba(248, 241, 230, 0.76);
  background: transparent;
  cursor: pointer;
}

.category-switch button.is-active {
  color: #0f1720;
  background: linear-gradient(135deg, var(--gold), #f4d9a3);
}

.platform-panels {
  margin-top: 28px;
}

.platform-grid {
  display: none;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.platform-grid.is-visible {
  display: grid;
}

.platform-card {
  display: grid;
  gap: 18px;
  padding: 26px;
  border-radius: var(--radius-lg);
}

.card-head {
  display: grid;
  gap: 10px;
}

.label {
  display: inline-flex;
  width: fit-content;
  padding: 8px 12px;
  border-radius: 999px;
  color: var(--gold);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  border: 1px solid rgba(215, 184, 121, 0.22);
  background: rgba(215, 184, 121, 0.08);
}

.platform-card p,
.platform-card ul,
.platform-card footer {
  margin: 0;
}

.platform-card ul,
.materials-card ul,
.materials-card ol {
  padding-left: 1.1rem;
}

.platform-card footer {
  padding-top: 18px;
  color: var(--jade);
  border-top: 1px solid rgba(248, 241, 230, 0.1);
  font-weight: 700;
}

.link-actions {
  display: flex;
  margin-top: auto;
}

.link-list-card {
  grid-column: 1 / -1;
}

.platform-grid-triple {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  align-items: start;
}

.platform-grid-triple .link-list-card {
  grid-column: auto;
}

.link-stack {
  display: grid;
  gap: 14px;
}

.link-stack-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 16px 18px;
  border: 1px solid rgba(248, 241, 230, 0.1);
  border-radius: 18px;
  background: rgba(248, 241, 230, 0.04);
}

.link-stack-item strong {
  font-size: 1.02rem;
}

.link-stack-item .button {
  min-height: 42px;
  padding: 0 16px;
}

.roadmap-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 28px;
}

.roadmap-grid article,
.content-grid article {
  padding: 24px;
  border-radius: var(--radius-lg);
}

.roadmap-grid article > span {
  margin-bottom: 18px;
}

.roadmap-grid h3,
.materials-card h3,
.content-grid h3 {
  margin: 0 0 10px;
}

.materials-grid,
.content-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 28px;
}

.materials-card {
  padding: 24px;
  border-radius: var(--radius-lg);
}

.materials-card.accent {
  background:
    linear-gradient(180deg, rgba(131, 197, 163, 0.14), rgba(131, 197, 163, 0.05)),
    linear-gradient(180deg, rgba(248, 241, 230, 0.06), rgba(248, 241, 230, 0.04));
}

.materials-card ol {
  margin-top: 0;
}

.faq-list {
  display: grid;
  gap: 14px;
  margin-top: 28px;
}

.faq-item {
  overflow: hidden;
  border-radius: var(--radius-md);
}

.faq-trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  width: 100%;
  padding: 20px 24px;
  border: 0;
  color: var(--text);
  background: transparent;
  text-align: left;
  cursor: pointer;
}

.faq-trigger span:first-child {
  font-size: 1rem;
  font-weight: 700;
}

.faq-icon {
  position: relative;
  flex: none;
  width: 16px;
  height: 16px;
}

.faq-icon::before,
.faq-icon::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 16px;
  height: 2px;
  border-radius: 999px;
  background: var(--gold);
  transform: translate(-50%, -50%);
  transition: transform 180ms ease, opacity 180ms ease;
}

.faq-icon::after {
  transform: translate(-50%, -50%) rotate(90deg);
}

.faq-item.is-open .faq-icon::after {
  opacity: 0;
  transform: translate(-50%, -50%) rotate(0deg);
}

.faq-content {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 220ms ease;
}

.faq-content p {
  min-height: 0;
  margin: 0;
  padding: 0 24px 0;
}

.faq-item.is-open .faq-content {
  grid-template-rows: 1fr;
}

.faq-item.is-open .faq-content p {
  padding-bottom: 22px;
}

.closing-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 18px;
  margin-top: 80px;
  padding: 30px;
  border-radius: calc(var(--radius-xl) + 6px);
}

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition:
    opacity 420ms ease,
    transform 420ms ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 1080px) {
  .site-header {
    grid-template-columns: 1fr;
    justify-items: start;
    border-radius: 28px;
  }

  .site-nav {
    justify-content: flex-start;
  }

  .closing-card {
    grid-template-columns: 1fr;
  }

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

  .hero-embed-frame {
    max-width: 760px;
  }

  .stats-band,
  .roadmap-grid,
  .materials-grid,
  .content-grid,
  .platform-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 900px) {
  body::before {
    background-size: 48px 48px;
  }

  .page-shell {
    width: min(calc(100% - 28px), var(--max-width));
  }

  .hero {
    padding-top: 64px;
  }

  .hero-visual {
    padding: 22px;
  }

  .hero-side-intro h2 {
    font-size: clamp(1.7rem, 7vw, 2.5rem);
  }

  .hero-embed-frame {
    max-width: none;
  }

  .hero-side-intro p,
  .platform-card p,
  .platform-card li,
  .roadmap-grid p,
  .materials-card p,
  .materials-card li {
    font-size: 0.96rem;
    line-height: 1.7;
  }

  .hero-tags {
    margin: 0;
  }

  .hero-proof article {
    padding: 14px;
  }

  .platform-card,
  .materials-card,
  .roadmap-grid article,
  .stats-band article {
    padding: 22px;
  }

  .platform-grid-triple {
    grid-template-columns: 1fr;
  }

  .link-list-card {
    grid-column: auto;
  }

  .section-heading-wide h2 {
    white-space: normal;
  }
}

@media (max-width: 720px) {
  .page-shell {
    width: min(calc(100% - 24px), var(--max-width));
  }

  .site-header {
    top: 12px;
    margin-top: 12px;
    padding: 14px;
  }

  .brand {
    align-items: flex-start;
  }

  .hero {
    padding-top: 54px;
    padding-bottom: 24px;
  }

  .hero h1 {
    max-width: none;
    font-size: clamp(2.2rem, 15vw, 3.5rem);
  }

  .hero-side-intro h2 {
    font-size: clamp(1.5rem, 10vw, 2.1rem);
    line-height: 1.18;
  }

  .section-heading h2 {
    font-size: clamp(1.65rem, 8vw, 2.2rem);
  }

  .hero-visual,
  .platform-card,
  .materials-card,
  .closing-card,
  .stats-band article,
  .roadmap-grid article,
  .content-grid article,
  .faq-trigger {
    padding-left: 18px;
    padding-right: 18px;
  }

  .stats-band,
  .roadmap-grid,
  .materials-grid,
  .content-grid,
  .platform-grid {
    grid-template-columns: 1fr;
  }

  .link-stack-item {
    flex-direction: column;
    align-items: flex-start;
    padding: 14px;
  }

  .link-stack-item .button {
    width: 100%;
    justify-content: center;
  }

  .hero-tags {
    display: grid;
    gap: 10px;
    margin: 0;
  }

  .hero-tags li,
  .category-switch {
    width: 100%;
  }

  .category-switch {
    display: grid;
    border-radius: 22px;
  }

  .category-switch button {
    width: 100%;
    justify-content: center;
  }

  .hero-proof article {
    grid-template-columns: 44px 1fr;
    gap: 12px;
    padding: 14px;
  }

  .platform-card ul,
  .materials-card ul,
  .materials-card ol {
    padding-left: 1rem;
  }

  .hero-proof span,
  .roadmap-grid article > span {
    width: 44px;
    height: 44px;
    border-radius: 12px;
  }

  .closing-card {
    margin-top: 60px;
  }
}

@media (max-width: 480px) {
  body::before {
    background-size: 36px 36px;
  }

  .page-shell {
    width: min(calc(100% - 16px), var(--max-width));
    padding-bottom: 36px;
  }

  .hero {
    padding-top: 38px;
  }

  .hero-visual,
  .platform-card,
  .materials-card,
  .stats-band article,
  .roadmap-grid article {
    padding: 16px;
    border-radius: 18px;
  }

  .hero-side-intro p,
  .section-heading p,
  .platform-card p,
  .platform-card li,
  .roadmap-grid p,
  .materials-card p,
  .materials-card li {
    font-size: 0.92rem;
    line-height: 1.65;
  }

  .hero-proof article {
    grid-template-columns: 40px 1fr;
  }

  .hero-proof span,
  .roadmap-grid article > span {
    width: 40px;
    height: 40px;
    border-radius: 10px;
  }

  .hero-tags li {
    padding: 9px 12px;
    font-size: 0.92rem;
  }

  .hero-proof strong,
  .roadmap-grid h3,
  .materials-card h3,
  .platform-card h3 {
    font-size: 1rem;
  }

  .button,
  .button-primary,
  .button-secondary {
    min-height: 40px;
    padding: 0 14px;
    font-size: 0.95rem;
  }

  .category-switch {
    padding: 6px;
  }

  .category-switch button {
    min-height: 40px;
    padding: 0 12px;
    font-size: 0.94rem;
  }
}