:root {
  --ink: #111629;
  --ink-2: #1d2640;
  --panel: #f8f4ef;
  --paper: #fffaf4;
  --text: #253044;
  --muted: #657085;
  --line: rgba(37, 48, 68, 0.16);
  --violet: #6f4ec9;
  --teal: #18a6a0;
  --amber: #d99531;
  --rose: #cc5f86;
  --white: #ffffff;
  --shadow: 0 18px 50px rgba(17, 22, 41, 0.18);
  --radius: 8px;
  --container: 1160px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  background: var(--paper);
  font-family: "Microsoft YaHei", "PingFang SC", "Hiragino Sans GB", Arial, sans-serif;
  line-height: 1.75;
  text-rendering: optimizeLegibility;
}

body.nav-open {
  overflow: hidden;
}

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

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

p {
  margin: 0;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 100;
  padding: 8px 12px;
  color: var(--ink);
  background: var(--white);
  border: 1px solid var(--line);
  transform: translateY(-160%);
}

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

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  background: rgba(17, 22, 41, 0.66);
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(18px);
  transition: background 180ms ease, box-shadow 180ms ease;
}

.site-header.is-scrolled {
  background: rgba(17, 22, 41, 0.94);
  box-shadow: 0 8px 30px rgba(17, 22, 41, 0.24);
}

.nav {
  width: min(100% - 40px, var(--container));
  height: 72px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--white);
  font-weight: 800;
  letter-spacing: 0;
}

.brand img {
  width: 48px;
  height: 48px;
  object-fit: cover;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.72);
}

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

.nav-links a {
  position: relative;
  min-height: 40px;
  padding: 8px 14px;
  color: rgba(255, 255, 255, 0.82);
  border-radius: var(--radius);
  font-size: 15px;
  overflow: hidden;
  transition: color 180ms ease, background 180ms ease, transform 180ms ease;
}

.nav-links a::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 6px;
  height: 2px;
  background: var(--amber);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 180ms ease;
}

.nav-links a:hover,
.nav-links a:focus-visible,
.nav-links a.is-active {
  color: var(--white);
  background: rgba(255, 255, 255, 0.12);
  outline: none;
}

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

.nav-links .nav-download {
  margin-left: 8px;
  color: var(--ink);
  background: var(--amber);
  font-weight: 800;
  box-shadow: 0 10px 26px rgba(217, 149, 49, 0.24);
}

.nav-links .nav-download:hover,
.nav-links .nav-download:focus-visible {
  color: var(--ink);
  background: #efad4b;
  transform: translateY(-2px);
  box-shadow: 0 14px 34px rgba(217, 149, 49, 0.34);
}

.nav-links .nav-download::after {
  display: none;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 10px;
  color: var(--white);
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: var(--radius);
}

.nav-toggle span {
  display: block;
  height: 2px;
  margin: 5px 0;
  background: currentColor;
  transform-origin: center;
  transition: opacity 160ms ease, transform 160ms ease;
}

.nav-toggle b {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
}

.hero {
  position: relative;
  min-height: 92vh;
  display: grid;
  align-items: end;
  overflow: hidden;
  color: var(--white);
  background: var(--ink);
}

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

.hero-media img {
  object-fit: cover;
  object-position: center;
  transform: scale(1.02);
  animation: heroDrift 16s ease-in-out infinite alternate;
}

.hero-shade {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(17, 22, 41, 0.92) 0%, rgba(17, 22, 41, 0.64) 42%, rgba(17, 22, 41, 0.18) 100%),
    linear-gradient(0deg, rgba(17, 22, 41, 0.9) 0%, rgba(17, 22, 41, 0.12) 55%, rgba(17, 22, 41, 0.42) 100%);
}

.hero-inner {
  position: relative;
  z-index: 2;
  width: min(100% - 40px, var(--container));
  margin: 0 auto;
  padding: 150px 0 70px;
}

.eyebrow,
.section-kicker {
  margin-bottom: 12px;
  color: var(--amber);
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.2;
  color: inherit;
  letter-spacing: 0;
}

h1 {
  max-width: 760px;
  color: #f3c76e;
  font-size: clamp(36px, 5.6vw, 68px);
  font-weight: 900;
  text-shadow: 0 10px 32px rgba(0, 0, 0, 0.32);
}

.hero-copy {
  max-width: 670px;
  margin-top: 18px;
  color: rgba(255, 255, 255, 0.86);
  font-size: clamp(17px, 2.4vw, 22px);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 32px;
}

.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 12px 22px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-weight: 800;
  overflow: hidden;
  transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease, color 180ms ease, border-color 180ms ease;
}

.btn::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, transparent, rgba(255, 255, 255, 0.32), transparent);
  transform: translateX(-120%);
  transition: transform 520ms ease;
}

.btn:hover::before,
.btn:focus-visible::before {
  transform: translateX(120%);
}

.btn {
  isolation: isolate;
}

.btn::before {
  z-index: -1;
}

.btn:hover,
.btn:focus-visible {
  transform: translateY(-3px);
  outline: none;
}

.btn-primary {
  color: var(--ink);
  background: var(--amber);
  box-shadow: 0 12px 26px rgba(217, 149, 49, 0.28);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background: #efad4b;
}

.btn-secondary {
  color: var(--white);
  border-color: rgba(255, 255, 255, 0.42);
  background: rgba(255, 255, 255, 0.1);
}

.btn-secondary:hover,
.btn-secondary:focus-visible {
  background: rgba(255, 255, 255, 0.18);
  border-color: rgba(255, 255, 255, 0.68);
  box-shadow: 0 12px 30px rgba(255, 255, 255, 0.12);
}

.hero-meta {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  max-width: 560px;
  margin: 44px 0 0;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.13);
}

.hero-meta div {
  padding: 16px 18px;
  background: rgba(17, 22, 41, 0.34);
}

.hero-meta dt {
  color: rgba(255, 255, 255, 0.62);
  font-size: 13px;
}

.hero-meta dd {
  margin: 4px 0 0;
  color: var(--white);
  font-weight: 800;
}

.section-band {
  padding: 92px 0;
}

.container {
  width: min(100% - 40px, var(--container));
  margin: 0 auto;
}

.quick-facts {
  color: var(--white);
  background: var(--ink);
}

.quick-facts h2 {
  max-width: 760px;
  color: #f3c76e;
  font-size: clamp(24px, 3.2vw, 36px);
}

.facts-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 34px;
}

.facts-grid article,
.feature-card,
.guide-steps article,
.pillars article,
.timeline article,
.faq-list details {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
  box-shadow: 0 12px 36px rgba(17, 22, 41, 0.08);
  transition: transform 220ms ease, box-shadow 220ms ease, border-color 220ms ease, background 220ms ease;
}

.facts-grid article {
  min-height: 190px;
  padding: 26px;
  color: var(--white);
  background: rgba(255, 255, 255, 0.07);
  border-color: rgba(255, 255, 255, 0.14);
}

.facts-grid article:hover,
.facts-grid article:focus-within {
  transform: translateY(-6px);
  border-color: rgba(243, 199, 110, 0.58);
  background: rgba(255, 255, 255, 0.1);
  box-shadow: 0 20px 48px rgba(0, 0, 0, 0.22);
}

.facts-grid h3,
.feature-card h3,
.guide-steps h3,
.pillars h3,
.timeline h3 {
  margin-top: 12px;
  color: inherit;
  font-size: 20px;
}

.facts-grid p {
  margin-top: 10px;
  color: rgba(255, 255, 255, 0.72);
}

.sprite {
  width: 44px;
  height: 44px;
  display: inline-block;
  border-radius: 50%;
  background:
    linear-gradient(135deg, rgba(24, 166, 160, 0.95), rgba(111, 78, 201, 0.92));
  position: relative;
  box-shadow: 0 10px 24px rgba(24, 166, 160, 0.24);
  transition: transform 220ms ease, box-shadow 220ms ease;
}

.facts-grid article:hover .sprite,
.facts-grid article:focus-within .sprite {
  transform: rotate(8deg) scale(1.08);
  box-shadow: 0 14px 32px rgba(243, 199, 110, 0.24);
}

.sprite::before,
.sprite::after {
  content: "";
  position: absolute;
  inset: 12px;
  border: 2px solid rgba(255, 255, 255, 0.86);
}

.sprite-rune::before {
  transform: rotate(45deg);
}

.sprite-flask::before {
  inset: 10px 14px 8px;
  border-radius: 0 0 10px 10px;
  border-top: 0;
}

.sprite-flask::after {
  inset: 8px 17px 26px;
  border-radius: 2px;
}

.sprite-map::before {
  inset: 12px 10px;
  border-radius: 2px;
  transform: skewY(-8deg);
}

.intro-band,
.systems-band,
.faq-band {
  background: var(--paper);
}

.content-band,
.update-band {
  background: #eef6f4;
}

.guide-band {
  background: #f4eff8;
}

.two-column {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.86fr);
  gap: 48px;
  align-items: center;
}

.two-column.reverse {
  grid-template-columns: minmax(320px, 0.92fr) minmax(0, 1fr);
}

.copy-block h2,
.section-head h2,
.cta-inner h2 {
  color: var(--violet);
  font-size: clamp(26px, 3.6vw, 42px);
}

.copy-block p:not(.section-kicker),
.section-head p:not(.section-kicker),
.cta-inner p:not(.section-kicker) {
  margin-top: 18px;
  color: var(--muted);
  font-size: 17px;
}

.check-list {
  display: grid;
  gap: 12px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.check-list li {
  position: relative;
  padding-left: 28px;
  color: var(--text);
}

.check-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--teal);
  box-shadow: inset 0 0 0 3px rgba(255, 255, 255, 0.9);
}

.media-frame {
  margin: 0;
}

.media-frame img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: transform 260ms ease, box-shadow 260ms ease, filter 260ms ease;
}

.media-frame:hover img,
.media-frame:focus-within img {
  transform: translateY(-4px) scale(1.015);
  filter: saturate(1.07) contrast(1.03);
  box-shadow: 0 24px 64px rgba(17, 22, 41, 0.24);
}

.media-frame figcaption,
.gallery figcaption {
  margin-top: 12px;
  color: var(--muted);
  font-size: 14px;
}

.section-head {
  max-width: 820px;
  margin-bottom: 34px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.feature-card {
  position: relative;
  padding: 24px;
  overflow: hidden;
}

.feature-card::before,
.guide-steps article::before,
.pillars article::before {
  content: "";
  position: absolute;
  inset: 0;
  border-top: 3px solid var(--teal);
  opacity: 0;
  transition: opacity 220ms ease;
}

.feature-card:hover,
.feature-card:focus-within,
.guide-steps article:hover,
.guide-steps article:focus-within,
.pillars article:hover,
.pillars article:focus-within {
  transform: translateY(-6px);
  border-color: rgba(24, 166, 160, 0.32);
  box-shadow: 0 22px 52px rgba(17, 22, 41, 0.14);
}

.feature-card:hover::before,
.feature-card:focus-within::before,
.guide-steps article:hover::before,
.guide-steps article:focus-within::before,
.pillars article:hover::before,
.pillars article:focus-within::before {
  opacity: 1;
}

.feature-card p,
.guide-steps p,
.pillars p,
.timeline p,
.faq-list p {
  margin-top: 10px;
  color: var(--muted);
}

.gallery {
  display: grid;
  grid-template-columns: 1.15fr 0.92fr 0.92fr;
  gap: 18px;
  margin-top: 34px;
}

.gallery figure {
  margin: 0;
  overflow: hidden;
  border-radius: var(--radius);
}

.gallery img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border-radius: var(--radius);
  box-shadow: 0 14px 34px rgba(17, 22, 41, 0.14);
  transition: transform 320ms ease, filter 320ms ease, box-shadow 320ms ease;
}

.gallery figure:hover img,
.gallery figure:focus-within img {
  transform: scale(1.045);
  filter: saturate(1.08) contrast(1.04);
  box-shadow: 0 22px 52px rgba(17, 22, 41, 0.2);
}

.gallery figure:first-child img {
  aspect-ratio: 16 / 8.5;
}

.guide-steps {
  display: grid;
  gap: 14px;
  margin-top: 26px;
}

.guide-steps article {
  position: relative;
  padding: 20px;
  overflow: hidden;
}

.guide-steps strong {
  color: var(--rose);
  font-size: 15px;
}

.pillars {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 16px;
}

.pillars article {
  position: relative;
  padding: 22px;
  overflow: hidden;
}

.timeline {
  display: grid;
  gap: 18px;
  position: relative;
}

.timeline article {
  position: relative;
  padding: 26px 28px;
  border-left: 5px solid var(--teal);
}

.timeline article:hover,
.timeline article:focus-within {
  transform: translateX(6px);
  border-color: rgba(17, 22, 41, 0.16);
  box-shadow: 0 22px 52px rgba(17, 22, 41, 0.14);
}

.timeline article:nth-child(2) {
  border-left-color: var(--violet);
}

.timeline article:nth-child(3) {
  border-left-color: var(--amber);
}

.timeline time {
  color: var(--rose);
  font-weight: 900;
}

.faq-list {
  display: grid;
  gap: 14px;
  max-width: 900px;
}

.faq-list details {
  padding: 0 22px;
}

.faq-list details:hover,
.faq-list details:focus-within {
  border-color: rgba(111, 78, 201, 0.34);
  box-shadow: 0 18px 42px rgba(17, 22, 41, 0.12);
}

.faq-list summary {
  cursor: pointer;
  padding: 20px 0;
  color: var(--ink);
  font-weight: 800;
  transition: color 180ms ease;
}

.faq-list summary::marker {
  color: var(--teal);
}

.faq-list details:hover summary,
.faq-list details:focus-within summary {
  color: var(--violet);
}

.faq-list p {
  padding-bottom: 20px;
}

.cta-band {
  padding: 70px 0;
  color: var(--white);
  background:
    linear-gradient(90deg, rgba(17, 22, 41, 0.96), rgba(29, 38, 64, 0.95)),
    url("img/tu2.jpg") center / cover;
}

.cta-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

.cta-inner h2 {
  color: #f3c76e;
}

.cta-inner p:not(.section-kicker) {
  max-width: 720px;
  color: rgba(255, 255, 255, 0.74);
}

.site-footer {
  padding: 34px 0;
  color: rgba(255, 255, 255, 0.76);
  background: #0b0f1b;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 28px;
}

.site-footer strong {
  color: var(--white);
}

.site-footer p {
  max-width: 560px;
  margin-top: 8px;
}

.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-content: flex-start;
}

.site-footer a {
  color: rgba(255, 255, 255, 0.78);
}

.site-footer a:hover,
.site-footer a:focus-visible {
  color: var(--white);
}

@keyframes heroDrift {
  from {
    transform: scale(1.02) translate3d(0, 0, 0);
  }
  to {
    transform: scale(1.06) translate3d(-1.2%, -0.8%, 0);
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }

}

@media (max-width: 980px) {
  .nav-toggle {
    display: block;
  }

  .nav-links {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    display: none;
    padding: 14px 20px 22px;
    background: rgba(17, 22, 41, 0.98);
    border-bottom: 1px solid rgba(255, 255, 255, 0.14);
  }

  .nav-open .nav-links {
    display: grid;
  }

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

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

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

  .nav-links a {
    min-height: 46px;
    display: flex;
    align-items: center;
  }

  .nav-links .nav-download {
    justify-content: center;
    margin: 8px 0 0;
  }

  .two-column,
  .two-column.reverse {
    grid-template-columns: 1fr;
  }

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

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

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

  .gallery figure:first-child img {
    aspect-ratio: 16 / 10;
  }

  .cta-inner,
  .footer-inner {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 680px) {
  .nav,
  .container,
  .hero-inner {
    width: min(100% - 28px, var(--container));
  }

  .brand span {
    font-size: 15px;
  }

  .hero {
    min-height: 88vh;
  }

  .hero-shade {
    background:
      linear-gradient(0deg, rgba(17, 22, 41, 0.95) 0%, rgba(17, 22, 41, 0.62) 58%, rgba(17, 22, 41, 0.48) 100%);
  }

  .hero-inner {
    padding: 126px 0 48px;
  }

  .hero-actions,
  .hero-meta {
    width: 100%;
  }

  .btn {
    width: 100%;
  }

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

  .section-band {
    padding: 64px 0;
  }

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

  .facts-grid article,
  .feature-card,
  .pillars article,
  .timeline article {
    padding: 20px;
  }
}