:root {
  --color-bg: #070706;
  --color-surface: rgba(18, 16, 12, 0.82);
  --color-surface-soft: rgba(18, 16, 12, 0.68);
  --color-border: rgba(212, 176, 111, 0.18);
  --color-border-strong: rgba(212, 176, 111, 0.32);
  --color-text: #e7ddcb;
  --color-text-muted: #a89f8f;
  --color-highlight: #d9b46b;
  --color-highlight-strong: #f4c97e;
  --color-shadow: rgba(0, 0, 0, 0.55);
  --radius-large: 28px;
  --radius-medium: 20px;
  --max-width: 1080px;
  --font-body: "Microsoft YaHei", "Microsoft JhengHei", "PingFang SC", "Hiragino Sans GB", "Noto Sans CJK SC", "Source Han Sans CN", "Segoe UI", "Helvetica Neue", Arial, sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-text);
  background: var(--color-bg);
  background-image:
    linear-gradient(180deg, rgba(0, 0, 0, 0.9) 0%, rgba(7, 7, 6, 0.95) 15%, rgba(7, 7, 6, 0.9) 100%),
    url('bg.jpg');
  background-repeat: no-repeat;
  background-position: center top;
  background-size: cover;
}

body.no-scroll {
  overflow: hidden;
}

body::after {
  content: "";
  position: fixed;
  inset: auto 0 0 0;
  height: 300px;
  background: url('footer.jpg') no-repeat center bottom;
  background-size: cover;
  opacity: 0.45;
  pointer-events: none;
  z-index: 0;
}

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

main {
  position: relative;
  z-index: 1;
}

img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid rgba(217, 180, 107, 0.16);
  box-shadow: 0 18px 36px rgba(0, 0, 0, 0.32);
}

a {
  color: var(--color-highlight-strong);
  text-decoration: none;
  transition: color 0.2s ease, opacity 0.2s ease;
}

a:hover {
  color: var(--color-highlight);
}

.container {
  width: min(var(--max-width), calc(100% - 3rem));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  background: linear-gradient(180deg, rgba(9, 9, 8, 0.96) 0%, rgba(9, 9, 8, 0.82) 70%, rgba(9, 9, 8, 0));
  backdrop-filter: blur(12px);
}

.site-header__inner {
  display: flex;
  align-items: center;
  gap: 1.75rem;
  padding: 1.5rem 0;
  flex-wrap: wrap;
}

.logo {
  width: 190px;
  height: 72px;
  flex-shrink: 0;
  background: url('logo.png') no-repeat center;
  background-size: contain;
}

.site-nav {
  display: flex;
  gap: 1.1rem;
  flex: 1;
  flex-wrap: wrap;
  justify-content: center;
  font-size: 0.95rem;
}

.site-nav__link {
  color: var(--color-text);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 600;
  opacity: 0.86;
}

.site-nav__link:hover {
  opacity: 1;
  color: var(--color-highlight-strong);
}

.site-header__toggle {
  display: none;
  align-items: center;
  justify-content: center;
  margin-left: auto;
  width: 46px;
  height: 46px;
  border-radius: 999px;
  border: 1px solid var(--color-border-strong);
  background: rgba(20, 16, 12, 0.65);
  color: var(--color-highlight-strong);
  cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.site-header__toggle:hover {
  background: rgba(32, 24, 16, 0.82);
  border-color: var(--color-highlight-strong);
}

.site-header__toggle:focus-visible {
  outline: 2px solid var(--color-highlight-strong);
  outline-offset: 3px;
}

.site-header__toggle-bars,
.site-header__toggle-bars::before,
.site-header__toggle-bars::after {
  display: block;
  width: 18px;
  height: 2px;
  border-radius: 1px;
  background: var(--color-highlight-strong);
  transition: transform 0.25s ease, opacity 0.25s ease, background 0.25s ease;
}

.site-header__toggle-bars {
  position: relative;
}

.site-header__toggle-bars::before,
.site-header__toggle-bars::after {
  content: ;
  position: absolute;
  left: 0;
}

.site-header__toggle-bars::before {
  top: -6px;
}

.site-header__toggle-bars::after {
  top: 6px;
}

body.is-nav-open .site-header__toggle-bars {
  background: transparent;
}

body.is-nav-open .site-header__toggle-bars::before {
  transform: translateY(6px) rotate(45deg);
}

body.is-nav-open .site-header__toggle-bars::after {
  transform: translateY(-6px) rotate(-45deg);
}

.site-nav__backdrop {
  display: none;
}

body.is-nav-open .site-nav__backdrop {
  position: fixed;
  inset: 0;
  display: block;
  background: rgba(6, 5, 4, 0.6);
  backdrop-filter: blur(6px);
  z-index: 20;
}

.cta-download {
  width: 180px;
  height: 70px;
  display: inline-flex;
  justify-content: center;
  align-items: center;
  background: url('download.png') no-repeat center;
  background-size: contain;
  text-indent: -9999px;
  overflow: hidden;
  border-radius: 12px;
  filter: drop-shadow(0 15px 24px rgba(0, 0, 0, 0.3));
}

.cta-download:focus-visible,
.button-gold:focus-visible,
.button-ghost:focus-visible {
  outline: 2px solid var(--color-highlight-strong);
  outline-offset: 3px;
}

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

.hero {
  padding: clamp(3.5rem, 8vw, 6rem) 0 3rem;
}

.hero__layout {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(2.5rem, 6vw, 3.5rem);
  align-items: center;
}

.hero__eyebrow {
  letter-spacing: 0.38em;
  font-size: 0.75rem;
  text-transform: uppercase;
  color: var(--color-highlight);
  opacity: 0.88;
}

.hero__title {
  font-size: clamp(2.6rem, 5vw, 3.6rem);
  letter-spacing: 0.04em;
  margin: 0.75rem 0 1.25rem;
  color: #f4e9d6;
}

.hero__description {
  max-width: 32ch;
  color: var(--color-text-muted);
  margin: 0;
}

.hero__actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-top: 2.25rem;
}

.button-gold {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.9rem;
  border-radius: 999px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #211306;
  background: linear-gradient(120deg, var(--color-highlight-strong), #d7a856);
  box-shadow: 0 18px 32px rgba(16, 8, 0, 0.4);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.button-gold:hover {
  transform: translateY(-2px);
  box-shadow: 0 24px 40px rgba(16, 8, 0, 0.45);
}

.button-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.8rem;
  border-radius: 999px;
  border: 1px solid var(--color-border-strong);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-highlight-strong);
  background: transparent;
  box-shadow: 0 10px 22px rgba(0, 0, 0, 0.35);
}

.button-ghost:hover {
  border-color: var(--color-highlight-strong);
  color: #ffe9b5;
}

.hero__banner {
  margin: 0;
}

.hero__banner img {
  width: min(var(--max-width), calc(100% - 3rem));
  margin: 0 auto;
}

.hero__screens {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.2rem;
}

.panel {
  padding: clamp(3.5rem, 7vw, 6rem) 0;
}

.panel__surface {
  padding: clamp(2.5rem, 5vw, 3.5rem);
  border-radius: var(--radius-large);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  box-shadow: 0 28px 60px var(--color-shadow);
  position: relative;
}

.panel__surface--transparent {
  background: var(--color-surface-soft);
}

.panel__header {
  margin-bottom: 2rem;
}

.panel__eyebrow {
  display: inline-block;
  font-size: 0.78rem;
  letter-spacing: 0.38em;
  text-transform: uppercase;
  color: var(--color-highlight);
  opacity: 0.82;
}

.panel__title {
  margin: 0.75rem 0 0;
  font-size: clamp(1.9rem, 3vw, 2.4rem);
  letter-spacing: 0.06em;
}

.panel__body p {
  margin: 0 0 1.1rem;
  color: var(--color-text-muted);
}

.panel__body p strong {
  color: var(--color-highlight-strong);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: clamp(1.5rem, 4vw, 2.2rem);
}

.feature-card {
  padding: 1.9rem;
  border-radius: var(--radius-medium);
  background: rgba(10, 10, 10, 0.75);
  border: 1px solid rgba(212, 176, 111, 0.22);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04), 0 18px 34px rgba(0, 0, 0, 0.32);
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

/* Feature cards use a soft glow to echo the original gold UI finish. */
.feature-card h3 {
  margin: 0;
  font-size: 1.2rem;
  letter-spacing: 0.04em;
  color: #f1dfbd;
}

.feature-card p {
  margin: 0;
  color: var(--color-text-muted);
}

.feature-card__note {
  color: var(--color-highlight);
  font-size: 0.9rem;
}

.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.2rem;
}

.gallery img {
  border-radius: 18px;
  border: 1px solid rgba(212, 176, 111, 0.18);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
  cursor: zoom-in;
}

.gallery img:hover {
  transform: translateY(-6px);
  box-shadow: 0 24px 45px rgba(0, 0, 0, 0.45);
}

.community {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(2rem, 5vw, 3rem);
  align-items: center;
}

.community__text p {
  margin: 0 0 1.2rem;
  color: var(--color-text-muted);
}

.community__actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.community__media {
  display: grid;
  gap: 1.2rem;
}

.callout {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: clamp(2rem, 5vw, 3rem);
  border-radius: var(--radius-large);
  background: linear-gradient(135deg, rgba(23, 15, 6, 0.92), rgba(10, 10, 10, 0.85));
  border: 1px solid rgba(212, 176, 111, 0.4);
  box-shadow: 0 28px 58px rgba(0, 0, 0, 0.45);
}

.callout__title {
  margin: 0 0 0.5rem;
  font-size: clamp(1.6rem, 2.6vw, 2rem);
  letter-spacing: 0.05em;
}

.callout p {
  margin: 0;
  color: var(--color-text-muted);
}

.site-footer {
  padding: 3rem 0 4rem;
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

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

.lightbox {
  position: fixed;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 2rem clamp(1rem, 4vw, 3rem);
  z-index: 30;
}

.lightbox.is-open {
  display: flex;
}

.lightbox__backdrop {
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at center, rgba(38, 30, 20, 0.82), rgba(7, 6, 5, 0.95));
  backdrop-filter: blur(10px);
}

.lightbox__dialog {
  position: relative;
  z-index: 1;
  width: min(92vw, 1040px);
  max-height: 90vh;
  padding: clamp(1.5rem, 4vw, 2.5rem);
  background: rgba(14, 12, 9, 0.96);
  border: 1px solid rgba(212, 176, 111, 0.4);
  box-shadow: 0 48px 96px rgba(0, 0, 0, 0.65);
  display: flex;
  align-items: center;
  justify-content: center;
}

.lightbox__figure {
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: center;
  text-align: center;
}

.lightbox__image {
  width: min(80vw, 900px);
  max-height: 70vh;
  object-fit: contain;
}

.lightbox__caption {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
}

.lightbox__close,
.lightbox__nav {
  position: absolute;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  border: 1px solid rgba(212, 176, 111, 0.45);
  background: rgba(12, 10, 7, 0.72);
  color: var(--color-highlight-strong);
  cursor: pointer;
  transition: transform 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}

.lightbox__close {
  top: 1.2rem;
  right: 1.2rem;
  width: 2.75rem;
  height: 2.75rem;
  font-size: 1.4rem;
}

.lightbox__nav {
  top: 50%;
  width: 3.2rem;
  height: 3.2rem;
  font-size: 1.8rem;
  transform: translateY(-50%);
}

.lightbox__nav--prev {
  left: 1.2rem;
}

.lightbox__nav--next {
  right: 1.2rem;
}

.lightbox__close:hover,
.lightbox__nav:hover {
  background: rgba(39, 31, 18, 0.85);
  border-color: var(--color-highlight-strong);
  transform: translateY(-50%) scale(1.05);
}

.lightbox__close:hover {
  transform: scale(1.05);
}

.lightbox__nav:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  transform: translateY(-50%);
}

.lightbox__nav:disabled:hover {
  background: rgba(12, 10, 7, 0.72);
  border-color: rgba(212, 176, 111, 0.45);
}

.lightbox__close span,
.lightbox__nav span {
  pointer-events: none;
  line-height: 1;
}

@media (max-width: 1024px) {
  .hero__layout {
    grid-template-columns: 1fr;
  }

  .hero__description {
    max-width: none;
  }

  .hero__media {
    order: -1;
  }

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

  .callout {
    flex-direction: column;
    text-align: center;
  }

  .callout__text {
    text-align: center;
  }
}

@media (max-width: 720px) {
  .hero__banner img {
    width: 100%;
  }
  .site-header__inner {
    justify-content: space-between;
    align-items: center;
    gap: 0.75rem;
  }

  .site-header__toggle {
    display: inline-flex;
  }

  .site-nav {
    position: fixed;
    top: 78px;
    left: 0;
    right: 0;
    width: min(92vw, 420px);
    margin: 0 auto;
    background: rgba(16, 14, 11, 0.94);
    border: 1px solid rgba(212, 176, 111, 0.45);
    border-radius: 22px;
    padding: 1.6rem 1.5rem 1.8rem;
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.55);
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 1rem;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-12px);
    transition: opacity 0.2s ease, transform 0.25s ease;
    z-index: 32;
  }

  body.is-nav-open .site-nav {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateY(0);
  }

  .site-nav__link {
    font-size: 0.95rem;
    letter-spacing: 0.24em;
    text-align: center;
    padding: 0.35rem 0;
  }

  .cta-download {
    display: none;
  }

  .hero__layout {
    gap: 2rem;
  }

  .hero__media {
    order: -1;
  }

  .hero__screens {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.9rem;
  }



  .panel {
    padding: clamp(2.8rem, 10vw, 3.8rem) 0;
  }

  .panel__surface {
    padding: clamp(2rem, 6vw, 2.6rem);
  }

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

  .feature-card {
    padding: 1.6rem;
  }

  .gallery {
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
  }

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

  .callout {
    padding: 2.2rem 1.8rem;
  }
}

@media (max-width: 520px) {
  body {
    font-size: 15px;
  }

  .site-header__inner {
    padding: 0.8rem 0;
    gap: 0.6rem;
  }

  .site-nav {
    top: 64px;
    width: min(94vw, 360px);
    padding: 1.2rem 1.2rem 1.6rem;
    gap: 0.75rem;
  }

  .site-nav__link {
    font-size: 0.86rem;
    letter-spacing: 0.22em;
  }

  .logo {
    width: 150px;
    height: 56px;
  }

  .hero__title {
    font-size: clamp(2rem, 8vw, 2.5rem);
  }

  .hero__description {
    font-size: 0.95rem;
  }

  .hero__actions {
    width: 100%;
    flex-direction: column;
    gap: 0.85rem;
  }

  .hero__actions .button-gold,
  .hero__actions .button-ghost {
    width: 100%;
  }

  .panel__surface {
    padding: clamp(1.8rem, 7vw, 2.2rem);
  }

  .gallery {
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  }

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

  .callout {
    padding: 1.8rem 1.5rem;
  }
}