/* =====================================================================
   导航栏
===================================================================== */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 18px 0;
  transition: all 0.35s;
}
.nav.scrolled {
  padding: 12px 0;
  background: rgba(8, 11, 28, 0.7);
  backdrop-filter: blur(20px) saturate(160%);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
}
.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 20px;
  color: var(--text-0);
  letter-spacing: 0.04em;
  cursor: pointer;
}
.logo-mark {
  width: 38px; height: 38px;
  position: relative;
  display: grid; place-items: center;
  flex-shrink: 0;
}
.logo-mark::before {
  content: "";
  position: absolute; inset: 0;
  background: var(--grad-primary);
  border-radius: 10px;
  transform: rotate(45deg);
  box-shadow: var(--glow-primary);
}
.logo-mark::after {
  content: "";
  position: absolute;
  width: 16px; height: 16px;
  background: var(--bg-0);
  border-radius: 4px;
  transform: rotate(45deg);
}
.logo span { background: var(--grad-text); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.nav-link {
  padding: 8px 16px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-1);
  border-radius: var(--radius-pill);
  transition: all 0.2s;
  position: relative;
}
.nav-link:hover { color: var(--text-0); background: var(--surface); }
.nav-link.active { color: var(--c-primary); }
.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: -2px; left: 50%;
  transform: translateX(-50%);
  width: 4px; height: 4px;
  background: var(--c-primary);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--c-primary);
}
.nav-cta { display: flex; align-items: center; gap: var(--space-3); }

.menu-toggle { display: none; }

.user-chip {
  display: flex; align-items: center; gap: 8px;
  padding: 6px 14px 6px 6px;
  border-radius: var(--radius-pill);
  background: var(--surface);
  border: 1px solid var(--border);
  cursor: pointer;
  transition: all 0.2s;
}
.user-chip:hover { border-color: var(--border-strong); }
.avatar {
  width: 28px; height: 28px;
  border-radius: 50%;
  background: var(--grad-accent);
  display: grid; place-items: center;
  font-size: 12px; font-weight: 700; color: #fff;
}

/* =====================================================================
   HERO
===================================================================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 120px 0 80px;
  overflow: hidden;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: var(--space-8);
  align-items: center;
}
.hero-copy h1 {
  font-size: clamp(40px, 5.8vw, 76px);
  line-height: 1.05;
  font-weight: 900;
  color: var(--text-0);
  letter-spacing: -0.03em;
  margin: var(--space-5) 0;
}
.hero-copy h1 .line { display: block; }
.hero-copy .sub {
  font-size: clamp(16px, 1.6vw, 19px);
  color: var(--text-2);
  max-width: 540px;
  margin-bottom: var(--space-6);
  line-height: 1.7;
}
.hero-cta { display: flex; gap: var(--space-4); flex-wrap: wrap; margin-bottom: var(--space-7); }

.hero-stats {
  display: flex; gap: var(--space-7);
  padding-top: var(--space-6);
  border-top: 1px solid var(--border);
}
.stat .num {
  font-family: var(--font-display);
  font-size: 30px;
  font-weight: 800;
  background: var(--grad-text); -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.stat .lbl { font-size: 13px; color: var(--text-2); margin-top: 2px; }

/* Hero 可视化：旋转的世界核心 */
.hero-viz {
  position: relative;
  aspect-ratio: 1;
  display: grid;
  place-items: center;
}
.orb-system {
  position: absolute;
  inset: 0;
  display: grid; place-items: center;
}
.orb-core {
  width: 38%;
  aspect-ratio: 1;
  border-radius: 50%;
  background:
    radial-gradient(circle at 35% 30%, #fff 0%, var(--c-primary) 18%, var(--c-accent-2) 55%, #2a0a5e 100%);
  box-shadow:
    0 0 80px var(--c-primary-glow),
    0 0 160px rgba(177, 75, 255, 0.4),
    inset -20px -30px 60px rgba(0,0,0,0.6);
  position: relative;
  animation: float 6s ease-in-out infinite;
}
.orb-core::after {
  content: "";
  position: absolute; inset: -8px;
  border-radius: 50%;
  border: 1px dashed rgba(255,255,255,0.18);
  animation: spin 30s linear infinite;
}

/* 轨道环 */
.orbit-ring {
  position: absolute;
  border: 1px solid var(--border);
  border-radius: 50%;
}
.orbit-ring.r1 { width: 56%; aspect-ratio: 1; }
.orbit-ring.r2 { width: 78%; aspect-ratio: 1; border-style: dashed; }
.orbit-ring.r3 { width: 100%; aspect-ratio: 1; border-color: rgba(120,140,220,0.1); }

/* 沿轨道运行的节点 */
.satellite {
  position: absolute;
  width: 14px; height: 14px;
  border-radius: 50%;
  top: 50%; left: 50%;
  margin: -7px 0 0 -7px;
  --orbit-r: 0px;
  animation: orbit linear infinite;
  background: var(--c-primary);
  box-shadow: 0 0 12px var(--c-primary);
}
.satellite.s1 { --orbit-r: 28%; animation-duration: 14s; background: var(--c-primary); }
.satellite.s2 { --orbit-r: 39%; animation-duration: 22s; animation-direction: reverse; background: var(--c-accent); box-shadow: 0 0 12px var(--c-accent); }
.satellite.s3 { --orbit-r: 50%; animation-duration: 32s; background: var(--c-gold); box-shadow: 0 0 12px var(--c-gold); }
.satellite.s4 { --orbit-r: 39%; animation-duration: 22s; background: var(--c-mint); box-shadow: 0 0 12px var(--c-mint); animation-delay: -11s; }
.satellite.s5 { --orbit-r: 28%; animation-duration: 14s; animation-direction: reverse; background: var(--c-accent-2); animation-delay: -7s; }

@supports not (animation: orbit 1s) {
  .satellite { display: none; }
}

/* 浮动信息卡 */
.float-card {
  position: absolute;
  padding: 12px 16px;
  background: var(--surface-strong);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  backdrop-filter: blur(20px);
  font-size: 12px;
  box-shadow: var(--shadow-pop);
  animation: float 5s ease-in-out infinite;
  z-index: 2;
}
.float-card .fc-title { color: var(--text-0); font-weight: 700; font-size: 13px; }
.float-card .fc-sub { color: var(--text-2); margin-top: 2px; }
.float-card.fc-a { top: 6%; left: -6%; animation-delay: -1s; }
.float-card.fc-b { bottom: 10%; left: -2%; animation-delay: -2.5s; }
.float-card.fc-c { top: 18%; right: -8%; animation-delay: -3.5s; }
.float-card .dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; margin-right: 6px; }

/* =====================================================================
   信任栏 / 滚动字幕
===================================================================== */
.marquee-band {
  padding: var(--space-6) 0;
  border-block: 1px solid var(--border);
  background: rgba(10, 14, 40, 0.4);
  overflow: hidden;
  position: relative;
}
.marquee {
  display: flex;
  gap: var(--space-7);
  white-space: nowrap;
  animation: marquee 28s linear infinite;
  width: max-content;
}
.marquee-item {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 600;
  color: var(--text-2);
  letter-spacing: 0.05em;
}
.marquee-item svg { color: var(--c-primary); }

/* =====================================================================
   特性卡片区
===================================================================== */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-5);
}
.feature-card {
  padding: var(--space-6);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(14px);
  transition: all 0.35s;
  position: relative;
  overflow: hidden;
}
.feature-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-strong);
  background: var(--surface-hover);
}
.feature-icon {
  width: 56px; height: 56px;
  border-radius: var(--radius);
  display: grid; place-items: center;
  background: linear-gradient(135deg, rgba(56,225,255,0.18), rgba(177,75,255,0.18));
  border: 1px solid var(--border-strong);
  margin-bottom: var(--space-5);
  color: var(--c-primary);
}
.feature-card h3 {
  font-size: 20px;
  color: var(--text-0);
  margin-bottom: var(--space-3);
  font-weight: 700;
}
.feature-card p { color: var(--text-2); font-size: 14.5px; line-height: 1.7; }

/* 不同色调 */
.feature-card.t2 .feature-icon { color: var(--c-accent); }
.feature-card.t3 .feature-icon { color: var(--c-gold); }
.feature-card.t4 .feature-icon { color: var(--c-mint); }
.feature-card.t5 .feature-icon { color: var(--c-coral); }
.feature-card.t6 .feature-icon { color: var(--c-accent-2); }

/* =====================================================================
   工作流程 / 时间线
===================================================================== */
.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-5);
  position: relative;
}
.steps::before {
  content: "";
  position: absolute;
  top: 32px; left: 8%; right: 8%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--c-primary), var(--c-accent), transparent);
  opacity: 0.4;
}
.step {
  text-align: center;
  position: relative;
}
.step-num {
  width: 64px; height: 64px;
  margin: 0 auto var(--space-5);
  border-radius: 50%;
  display: grid; place-items: center;
  background: var(--bg-1);
  border: 2px solid var(--border-strong);
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 800;
  color: var(--c-primary);
  position: relative;
  z-index: 1;
  transition: all 0.3s;
}
.step:hover .step-num {
  background: var(--grad-primary);
  color: #04122a;
  border-color: transparent;
  box-shadow: var(--glow-primary);
  transform: scale(1.08);
}
.step h4 { font-size: 17px; color: var(--text-0); margin-bottom: var(--space-2); font-weight: 700; }
.step p { font-size: 13.5px; color: var(--text-2); }

/* =====================================================================
   对比区：传统 vs 模拟
===================================================================== */
.vs-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-5);
}
.vs-card {
  padding: var(--space-6);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: var(--surface);
  backdrop-filter: blur(14px);
}
.vs-card.bad { border-color: rgba(255,126,107,0.25); }
.vs-card.good { border-color: rgba(88,245,176,0.3); background: linear-gradient(160deg, rgba(88,245,176,0.06), var(--surface)); }
.vs-card h3 {
  display: flex; align-items: center; gap: 10px;
  font-size: 20px; color: var(--text-0); margin-bottom: var(--space-5);
  font-weight: 700;
}
.vs-card.bad h3 { color: var(--c-coral); }
.vs-card.good h3 { color: var(--c-mint); }
.vs-list li {
  display: flex; align-items: flex-start; gap: 12px;
  padding: 10px 0;
  font-size: 14.5px;
  color: var(--text-1);
  border-bottom: 1px dashed var(--border);
}
.vs-list li:last-child { border-bottom: none; }
.vs-list .mark {
  flex-shrink: 0;
  width: 22px; height: 22px;
  border-radius: 50%;
  display: grid; place-items: center;
  font-size: 12px;
  margin-top: 1px;
}
.vs-card.bad .mark { background: rgba(255,126,107,0.15); color: var(--c-coral); }
.vs-card.good .mark { background: rgba(88,245,176,0.15); color: var(--c-mint); }

/* =====================================================================
   案例展示 / 世界画廊预览
===================================================================== */
.world-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-5);
}
.world-card {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--bg-1);
  cursor: pointer;
  transition: all 0.4s;
  aspect-ratio: 4/5;
}
.world-card:hover {
  transform: translateY(-8px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-pop);
}
.world-thumb {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  transition: transform 0.6s;
}
.world-card:hover .world-thumb { transform: scale(1.08); }
.world-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 30%, rgba(5,6,15,0.5) 60%, rgba(5,6,15,0.96) 100%);
}
.world-meta {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  padding: var(--space-5);
  z-index: 2;
}
.world-meta .genre {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-primary);
  margin-bottom: 8px;
}
.world-meta h3 {
  font-size: 21px;
  color: var(--text-0);
  font-weight: 700;
  margin-bottom: 6px;
}
.world-meta p { font-size: 13px; color: var(--text-2); }
.world-stats {
  display: flex; gap: var(--space-4);
  margin-top: var(--space-4);
  padding-top: var(--space-3);
  border-top: 1px solid rgba(255,255,255,0.1);
  font-size: 12px;
  color: var(--text-2);
}
.world-stats b { color: var(--text-0); font-weight: 600; }

/* 顶部右上角浮动数据 */
.world-trend {
  position: absolute;
  top: var(--space-4); right: var(--space-4);
  display: flex; align-items: center; gap: 6px;
  padding: 5px 10px;
  border-radius: var(--radius-pill);
  background: rgba(5,6,15,0.6);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border);
  font-size: 12px;
  font-weight: 600;
  color: var(--c-mint);
  z-index: 2;
}

/* =====================================================================
   CTA 大横幅
===================================================================== */
.cta-banner {
  position: relative;
  padding: var(--space-8) var(--space-7);
  border-radius: var(--radius-xl);
  background:
    radial-gradient(circle at 20% 30%, rgba(56,225,255,0.18), transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(255,93,200,0.18), transparent 50%),
    linear-gradient(135deg, rgba(26,33,74,0.9), rgba(10,14,40,0.9));
  border: 1px solid var(--border-strong);
  text-align: center;
  overflow: hidden;
}
.cta-banner::before {
  content: "";
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(56,225,255,0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(56,225,255,0.05) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: radial-gradient(circle at center, #000, transparent 70%);
  -webkit-mask-image: radial-gradient(circle at center, #000, transparent 70%);
}
.cta-banner h2 {
  font-size: clamp(28px, 4vw, 44px);
  color: var(--text-0);
  margin-bottom: var(--space-4);
  position: relative;
}
.cta-banner p {
  font-size: 17px;
  color: var(--text-2);
  margin-bottom: var(--space-6);
  max-width: 540px; margin-inline: auto;
  position: relative;
}
.cta-banner .btns {
  display: flex; gap: var(--space-4); justify-content: center; flex-wrap: wrap;
  position: relative;
}

/* =====================================================================
   响应式
===================================================================== */
@media (max-width: 980px) {
  .hero-grid { grid-template-columns: 1fr; gap: var(--space-8); }
  .hero-viz { max-width: 480px; margin-inline: auto; order: -1; }
  .feature-grid, .world-grid { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); gap: var(--space-6) var(--space-5); }
  .steps::before { display: none; }
}
@media (max-width: 720px) {
  .nav-links { display: none; }
  .nav-links.open {
    display: flex;
    position: absolute;
    top: 70px; left: 16px; right: 16px;
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-4);
    background: var(--surface-strong);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(20px);
    gap: var(--space-2);
  }
  .nav-links.open .nav-link { padding: 12px 16px; }
  .menu-toggle {
    display: grid; place-items: center;
    width: 42px; height: 42px;
    border-radius: var(--radius);
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--text-0);
  }
  .nav-cta .btn:not(.menu-toggle) { display: none; }
  .hero { padding: 110px 0 60px; }
  .hero-stats { gap: var(--space-5); flex-wrap: wrap; }
  .float-card { display: none; }
  .feature-grid, .world-grid, .vs-grid { grid-template-columns: 1fr; }
  .section { padding: var(--space-8) 0; }
}