:root {
  color-scheme: dark;
  font-family: "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  color: #f3f5f9;
  background: #05080f;
}
* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}
body {
  margin: 0;
  min-height: 100%;
  background: #05080f;
}
.page-bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  background: radial-gradient(circle at top right, rgba(0, 212, 255, 0.18), transparent 24%), linear-gradient(180deg, rgba(10, 20, 44, 0.9), rgba(3, 7, 16, 0.98));
}
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(18px);
  background: rgba(3, 7, 16, 0.7);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}
.container {
  width: min(1120px, calc(100% - 2rem));
  margin: 0 auto;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 0;
}
.logo {
  color: #ffffff;
  font-size: 1.2rem;
  text-decoration: none;
  font-weight: 700;
}
.nav-links {
  display: flex;
  gap: 1.2rem;
}
.nav-links a {
  color: rgba(238, 242, 255, 0.85);
  text-decoration: none;
  font-weight: 500;
}
.nav-links a:hover {
  color: #6ee7ff;
}
.hero {
  min-height: 80vh;
  display: grid;
  place-items: center;
  padding: 5rem 0 3rem;
}
.hero-card {
  max-width: 720px;
  padding: 3rem;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 28px;
  background: rgba(5, 9, 22, 0.68);
  box-shadow: 0 40px 120px rgba(0, 0, 0, 0.35);
}
.eyebrow {
  margin: 0 0 1rem;
  color: #6ee7ff;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  font-size: 0.9rem;
}
.hero-card h1 {
  margin: 0;
  font-size: clamp(3rem, 5vw, 4.4rem);
  line-height: 0.95;
}
.hero-card p {
  max-width: 680px;
  line-height: 1.8;
  color: rgba(243, 245, 249, 0.86);
  margin: 1.5rem 0 2rem;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 1rem 1.75rem;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 600;
  transition: transform 0.22s ease, background-color 0.22s ease, color 0.22s ease;
}
.btn:hover {
  transform: translateY(-1px);
}
.btn-primary {
  background: linear-gradient(120deg, #38bdf8, #22c55e);
  color: #051116;
}
.btn-secondary {
  background: rgba(255, 255, 255, 0.08);
  color: #eef4ff;
  border: 1px solid rgba(255, 255, 255, 0.12);
}
.back-to-top {
  position: fixed;
  right: 1.5rem;
  bottom: 1.5rem;
  z-index: 20;
}
.fixed-actions {
  position: fixed;
  right: 1.5rem;
  bottom: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  z-index: 20;
}
.fixed-actions .btn {
  min-width: 140px;
}
.section-actions {
  margin: 1.5rem 0;
}
.section-actions .btn {
  min-width: 120px;
}
.section {
  padding: 5rem 0;
}
.section h2 {
  margin: 0 0 1rem;
  font-size: clamp(2rem, 3vw, 2.8rem);
}
.section p {
  max-width: 760px;
  line-height: 1.85;
  color: rgba(236, 239, 244, 0.82);
}
.log-list {
  display: grid;
  gap: 1.25rem;
  margin-top: 2rem;
}
.log-entry {
  padding: 1.5rem;
  border-radius: 22px;
  background: rgba(11, 19, 36, 0.75);
  border: 1px solid rgba(255, 255, 255, 0.06);
}
.log-entry time {
  display: block;
  margin-bottom: 0.75rem;
  color: #6ee7ff;
  font-size: 0.95rem;
}
.log-entry h3 {
  margin: 0 0 0.75rem;
  font-size: 1.2rem;
}
.log-entry p {
  margin: 0;
  color: rgba(226, 232, 240, 0.78);
  line-height: 1.75;
}
.team-grid,
.stats-grid,
.community-grid,
.contact-grid {
  display: grid;
  gap: 1.25rem;
  margin-top: 2rem;
}
.stats-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}
.team-grid {
  display: grid;
  gap: 1.25rem;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 2rem;
}
.team-card {
  padding: 1.5rem;
  border-radius: 22px;
  background: rgba(11, 19, 36, 0.75);
  border: 1px solid rgba(255, 255, 255, 0.06);
  text-align: center;
}
.team-avatar {
  width: 64px;
  height: 64px;
  margin: 0 auto 1rem;
  border-radius: 50%;
  background: linear-gradient(135deg, #38bdf8, #22c55e);
  display: grid;
  place-items: center;
  font-weight: 700;
  color: #051116;
  font-size: 1.2rem;
}
.team-card h3 {
  margin: 0 0 0.75rem;
  font-size: 1.1rem;
}
.team-card p {
  margin: 0;
  color: rgba(226, 232, 240, 0.78);
  line-height: 1.7;
}
.stat-card,
.community-card,
.contact-grid > div {
  padding: 1.5rem;
  border-radius: 22px;
  background: rgba(11, 19, 36, 0.75);
  border: 1px solid rgba(255, 255, 255, 0.06);
}
.stat-card strong,
.community-card h3,
.contact-grid strong {
  display: block;
  margin-bottom: 0.75rem;
  font-size: 1.05rem;
}
.stat-card span,
.community-card p,
.contact-grid span {
  color: rgba(226, 232, 240, 0.78);
  line-height: 1.7;
}
.carousel {
  position: relative;
  margin-top: 2rem;
}
.carousel-track {
  display: flex;
  gap: 1rem;
  overflow-x: auto;
  padding-bottom: 6px;
  -webkit-overflow-scrolling: touch;
  scroll-snap-type: x mandatory;
}
.carousel-track::-webkit-scrollbar { height: 10px; }
.carousel-track::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.08); border-radius: 10px; }
.gallery-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 2rem;
}
.gallery-grid .gallery-card {
  min-height: 260px;
  min-width: auto;
  width: 100%;
  border-radius: 24px;
  background-size: cover;
  background-position: center;
  position: relative;
  overflow: hidden;
}
.gallery-card {
  min-height: 260px;
  min-width: 320px;
  flex: 0 0 320px;
  border-radius: 16px;
  background-size: cover;
  background-position: center;
  position: relative;
  overflow: hidden;
  scroll-snap-align: start;
}
.gallery-card::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 25%, rgba(5, 9, 22, 0.86) 100%);
}
/* Lightbox styles */
.gallery-card { cursor: zoom-in; }
.lightbox {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(3,7,16,0.96);
  z-index: 50;
  opacity: 0;
  pointer-events: none;
  transition: opacity 200ms ease;
}
.lightbox[aria-hidden="false"] { opacity: 1; pointer-events: auto; }
.lightbox-inner { max-width: 92%; max-height: 92%; }
.lightbox img { max-width: 100%; max-height: 80vh; border-radius: 8px; display: block; margin: 0 auto; }
.lightbox-caption { margin-top: 0.75rem; color: rgba(236,239,244,0.9); text-align: center; }
.lightbox-close { position: absolute; top: 22px; right: 22px; background: rgba(0,0,0,0.35); color: #fff; border: 0; width: 40px; height: 40px; border-radius: 50%; cursor: pointer; font-size: 1.08rem; }

.carousel-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(3,7,16,0.6);
  border: 1px solid rgba(255,255,255,0.06);
  color: #fff;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 5;
}
.carousel-btn.prev { left: -12px; }
.carousel-btn.next { right: -12px; }
.carousel-track.dragging { cursor: grabbing; }
.gallery-label {
  position: absolute;
  left: 1.25rem;
  bottom: 1.25rem;
  color: #ffffff;
  font-size: 1.05rem;
  font-weight: 700;
}
.contact-card {
  max-width: 900px;
  margin: 0 auto;
  text-align: center;
}
.contact-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}
.contact-grid strong {
  color: #6ee7ff;
}
.site-footer {
  padding: 1.5rem 0 2.5rem;
  text-align: center;
  color: rgba(226, 232, 240, 0.72);
}
@media (max-width: 900px) {
  .stats-grid,
  .carousel-track,
  .community-grid,
  .contact-grid {
    grid-template-columns: 1fr;
  }
  .carousel-track { flex-direction: column; overflow: visible; }
  .carousel-btn { display: none; }
  .header-inner {
    flex-direction: column;
    gap: 1rem;
    align-items: flex-start;
  }
  .nav-links {
    flex-wrap: wrap;
  }
}
@media (max-width: 640px) {
  .hero-card {
    padding: 2rem;
  }
  .hero-card h1 {
    font-size: 2.8rem;
  }
}

/* ---- 媒体中心风格 lightbox 面板 ---- */
.lb-panel {
  width: min(1150px, 95vw);
  max-height: 92vh;
  display: flex;
  background: rgba(8,13,26,0.97);
  border: 1px solid rgba(255,255,255,0.10);
  border-radius: 14px;
  overflow: hidden;
  box-shadow: 0 24px 80px rgba(0,0,0,0.6);
  position: relative;
}
.lb-side {
  width: 320px;
  flex: 0 0 320px;
  padding: 52px 26px 22px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  background: linear-gradient(180deg, rgba(255,255,255,0.05), transparent);
  border-right: 1px solid rgba(255,255,255,0.08);
}
.lb-brand {
  letter-spacing: 0.32em;
  font-weight: 800;
  font-size: 0.82rem;
  color: rgba(255,255,255,0.5);
}
.lb-title { color: #fff; font-size: 1.75rem; font-weight: 800; margin: auto 0 12px; line-height: 1.35; }
.lb-size-label { color: rgba(255,255,255,0.55); font-size: 0.82rem; margin-top: auto; }
.lb-size-row { display: flex; gap: 10px; align-items: stretch; }
.lb-size-val {
  flex: 1;
  min-width: 0;
  padding: 11px 14px;
  border-radius: 10px;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.14);
  color: #fff;
  font-size: 0.95rem;
  font-family: inherit;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.lb-download {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 11px 20px;
  border-radius: 10px;
  cursor: pointer;
  background: linear-gradient(180deg, #ffb347, #ff8c00);
  color: #1a1206;
  font-weight: 800;
  font-size: 0.95rem;
  text-decoration: none;
  white-space: nowrap;
}
.lb-download:hover { filter: brightness(1.08); }
.lb-nav {
  margin-top: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding-top: 14px;
  border-top: 1px solid rgba(255,255,255,0.08);
}
.lb-nav-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.14);
  color: #fff;
  font-size: 1.25rem;
  line-height: 1;
  cursor: pointer;
}
.lb-nav-btn:hover { background: rgba(255,255,255,0.18); }
.lb-index { color: rgba(255,255,255,0.6); font-size: 0.9rem; }
.lightbox-inner {
  flex: 1;
  min-width: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 18px;
  background: rgba(0,0,0,0.5);
}
.lightbox img { max-width: 100%; max-height: calc(92vh - 36px); border-radius: 6px; display: block; }
@media (max-width: 760px) {
  .lb-panel { flex-direction: column-reverse; width: 96vw; max-height: 94vh; }
  .lb-side { width: 100%; flex: none; padding: 40px 18px 16px; border-right: 0; }
  .lightbox-inner { min-height: 40vh; }
}

/* 懒加载：占位底色与淡入 */
.gallery-card[data-bg] { background-color: #182236; }
.gallery-card { transition: background-image 0.25s ease, opacity 0.25s ease; }