/* ==========================================================================
   MYAI 优城市 (myai.city)
   组件样式表: 导航栏、3D首屏、业务卡片、AI控制台、模态框、页脚
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. 顶部滚动进度指示条 & 吸顶导航栏 (Header)
   -------------------------------------------------------------------------- */
.scroll-progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0%;
  background: linear-gradient(90deg, var(--cyan-primary), var(--purple-primary), var(--emerald-primary));
  z-index: 1000;
  transition: width 0.1s ease-out;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 76px;
  z-index: 900;
  transition: all 0.35s ease;
  background: transparent;
}

.site-header.scrolled {
  background: rgba(6, 8, 15, 0.82);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.6);
  height: 68px;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.brand-logo-link {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-logo-img {
  width: 40px;
  height: 40px;
  filter: drop-shadow(0 0 10px rgba(0, 240, 255, 0.45));
  transition: transform 0.3s ease;
}

.brand-logo-link:hover .brand-logo-img {
  transform: scale(1.08) rotate(5deg);
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: #FFFFFF;
}

.brand-sub {
  font-size: 0.68rem;
  font-family: var(--font-mono);
  color: var(--cyan-primary);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.nav-desktop {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: 6px 0;
}

.nav-link:hover,
.nav-link.active {
  color: #FFFFFF;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--cyan-primary);
  box-shadow: 0 0 8px var(--cyan-primary);
  transition: all 0.25s ease;
  transform: translateX(-50%);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

/* 移动端汉堡按钮 */
.menu-toggle {
  display: none;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 8px;
  color: #FFFFFF;
}

@media (max-width: 992px) {
  .nav-desktop {
    display: none;
  }
  .menu-toggle {
    display: block;
  }
}

/* 移动端全屏抽屉菜单 */
.mobile-nav-drawer {
  position: fixed;
  top: 76px;
  left: 0;
  width: 100%;
  height: calc(100vh - 76px);
  background: rgba(6, 8, 15, 0.96);
  backdrop-filter: blur(20px);
  z-index: 890;
  display: flex;
  flex-direction: column;
  padding: 30px 24px;
  gap: 20px;
  transform: translateY(-100%);
  opacity: 0;
  pointer-events: none;
  transition: all 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  border-bottom: 1px solid var(--border-light);
}

.mobile-nav-drawer.open {
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
}

.mobile-nav-link {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  padding: 12px 0;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.mobile-nav-link:hover {
  color: var(--cyan-primary);
  padding-left: 8px;
}

/* --------------------------------------------------------------------------
   2. 现代化按钮体系 (Buttons)
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-size: 0.95rem;
  font-weight: 600;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.25s ease;
  position: relative;
  overflow: hidden;
  white-space: nowrap;
  border: 1px solid transparent;
}

.btn-primary {
  background: linear-gradient(135deg, #00F0FF 0%, #0072FF 100%);
  color: #06080F;
  box-shadow: 0 0 25px rgba(0, 240, 255, 0.35);
}

.btn-primary:hover {
  box-shadow: 0 0 35px rgba(0, 240, 255, 0.65);
  transform: translateY(-2px);
  color: #000000;
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--border-light);
  color: #FFFFFF;
  backdrop-filter: blur(8px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: var(--cyan-primary);
  box-shadow: 0 0 20px rgba(0, 240, 255, 0.2);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.85rem;
}

.btn-lg {
  padding: 15px 32px;
  font-size: 1.05rem;
  border-radius: var(--radius-md);
}

/* --------------------------------------------------------------------------
   3. 首屏 Hero Section 与 3D WebGL 画布
   -------------------------------------------------------------------------- */
.hero-section {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding-top: 100px;
  padding-bottom: 60px;
  overflow: hidden;
}

#hero-webgl-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  pointer-events: auto;
  cursor: grab;
}

#hero-webgl-canvas:active {
  cursor: grabbing;
}

.hero-overlay-gradient {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 2;
  pointer-events: none;
  background: 
    radial-gradient(circle at 50% 40%, rgba(6, 8, 15, 0.2) 0%, rgba(6, 8, 15, 0.85) 85%),
    linear-gradient(to bottom, rgba(6, 8, 15, 0.4) 0%, transparent 40%, rgba(6, 8, 15, 0.95) 100%);
}

.hero-content {
  position: relative;
  z-index: 3;
  text-align: center;
  max-width: 900px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 20px;
  border-radius: var(--radius-full);
  background: rgba(13, 19, 33, 0.7);
  border: 1px solid rgba(0, 240, 255, 0.3);
  backdrop-filter: blur(12px);
  margin-bottom: 24px;
  box-shadow: 0 0 20px rgba(0, 240, 255, 0.15);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--cyan-primary);
}

.hero-badge .ping {
  position: relative;
  display: flex;
  height: 8px;
  width: 8px;
}

.hero-badge .ping-circle {
  animation: ping 1.5s cubic-bezier(0, 0, 0.2, 1) infinite;
  position: absolute;
  height: 100%;
  width: 100%;
  border-radius: 9999px;
  background-color: var(--cyan-primary);
  opacity: 0.75;
}

.hero-badge .ping-dot {
  position: relative;
  border-radius: 9999px;
  height: 8px;
  width: 8px;
  background-color: var(--cyan-primary);
}

@keyframes ping {
  75%, 100% {
    transform: scale(2.2);
    opacity: 0;
  }
}

.hero-title {
  font-size: clamp(2.5rem, 5.5vw, 4.2rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 20px;
  color: #FFFFFF;
}

.hero-title .glow-word {
  background: linear-gradient(135deg, #00F0FF 10%, #A855F7 90%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 0 25px rgba(0, 240, 255, 0.4));
}

.hero-subtitle {
  font-size: clamp(1rem, 1.8vw, 1.25rem);
  color: var(--text-secondary);
  max-width: 760px;
  margin: 0 auto 36px auto;
  line-height: 1.7;
}

.hero-domain-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--cyan-primary);
  background: rgba(0, 240, 255, 0.1);
  padding: 3px 10px;
  border-radius: 6px;
  border: 1px solid rgba(0, 240, 255, 0.25);
  margin-bottom: 12px;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  margin-bottom: 54px;
  flex-wrap: wrap;
}

/* 首屏关键数据指标条 */
.hero-metrics-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  background: rgba(13, 19, 33, 0.65);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px;
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow-card);
}

@media (max-width: 768px) {
  .hero-metrics-bar {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    padding: 18px;
  }
}

.metric-item {
  text-align: center;
}

.metric-value {
  font-size: clamp(1.6rem, 2.8vw, 2.2rem);
  font-weight: 800;
  font-family: var(--font-mono);
  background: linear-gradient(135deg, #FFFFFF, var(--cyan-primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 4px;
}

.metric-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* --------------------------------------------------------------------------
   4. 核心主营业务卡片 (Core Services - 3D微倾斜 & 极客光影)
   -------------------------------------------------------------------------- */
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

@media (max-width: 1024px) {
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .services-grid {
    grid-template-columns: 1fr;
  }
}

/* 跨列高亮特色卡片 (AI Agent 本地部署) */
.service-card-featured {
  grid-column: span 2;
  background: linear-gradient(135deg, rgba(168, 85, 247, 0.12) 0%, rgba(0, 240, 255, 0.08) 100%), var(--bg-card);
  border-color: rgba(0, 240, 255, 0.35);
  box-shadow: 0 0 30px rgba(0, 240, 255, 0.12);
}

@media (max-width: 1024px) {
  .service-card-featured {
    grid-column: span 2;
  }
}

@media (max-width: 640px) {
  .service-card-featured {
    grid-column: span 1;
  }
}

.service-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  backdrop-filter: blur(14px);
  box-shadow: var(--shadow-card);
  transition: all 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--cyan-primary), transparent);
  opacity: 0;
  transition: opacity 0.35s ease;
}

.service-card:hover {
  transform: translateY(-6px);
  border-color: rgba(0, 240, 255, 0.35);
  background: var(--bg-card-hover);
  box-shadow: 0 20px 40px -15px rgba(0, 240, 255, 0.2), var(--shadow-card);
}

.service-card:hover::before {
  opacity: 1;
}

.service-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 22px;
}

.service-icon-box {
  width: 58px;
  height: 58px;
  border-radius: var(--radius-md);
  background: rgba(0, 240, 255, 0.08);
  border: 1px solid rgba(0, 240, 255, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--cyan-primary);
  box-shadow: 0 0 18px rgba(0, 240, 255, 0.15);
  transition: all 0.3s ease;
}

.service-card:hover .service-icon-box {
  transform: scale(1.08);
  background: rgba(0, 240, 255, 0.15);
  box-shadow: 0 0 25px rgba(0, 240, 255, 0.3);
}

.service-icon-box.purple {
  background: rgba(168, 85, 247, 0.08);
  border-color: rgba(168, 85, 247, 0.25);
  color: var(--purple-primary);
  box-shadow: 0 0 18px rgba(168, 85, 247, 0.15);
}

.service-card:hover .service-icon-box.purple {
  background: rgba(168, 85, 247, 0.18);
  box-shadow: 0 0 25px rgba(168, 85, 247, 0.35);
}

.service-badge {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  background: rgba(0, 255, 178, 0.12);
  color: var(--emerald-primary);
  border: 1px solid rgba(0, 255, 178, 0.3);
  text-transform: uppercase;
}

.service-badge.hot {
  background: linear-gradient(135deg, rgba(244, 63, 94, 0.2), rgba(168, 85, 247, 0.25));
  color: #fb7185;
  border-color: rgba(244, 63, 94, 0.4);
}

.service-title {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: #FFFFFF;
}

.service-en {
  font-size: 0.78rem;
  font-family: var(--font-mono);
  color: var(--text-accent);
  letter-spacing: 0.05em;
  margin-bottom: 14px;
}

.service-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 24px;
}

.service-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 26px;
}

.service-tag-item {
  font-size: 0.78rem;
  padding: 4px 10px;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-muted);
  border: 1px solid var(--border-subtle);
}

.service-footer {
  border-top: 1px solid var(--border-subtle);
  padding-top: 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.service-action-link {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--cyan-primary);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
}

.service-action-link:hover {
  color: #FFFFFF;
  transform: translateX(4px);
}

/* --------------------------------------------------------------------------
   5. AI Agent 本地部署深度架构展示区 (Console Showcase)
   -------------------------------------------------------------------------- */
.ai-showcase-box {
  background: var(--bg-card);
  border: 1px solid rgba(0, 240, 255, 0.25);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: 0 0 50px rgba(0, 240, 255, 0.08);
  backdrop-filter: blur(16px);
}

@media (max-width: 768px) {
  .ai-showcase-box {
    padding: 24px 16px;
  }
}

.ai-terminal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 18px;
  margin-bottom: 28px;
}

.terminal-dots {
  display: flex;
  align-items: center;
  gap: 8px;
}

.terminal-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}
.dot-red { background: #ff5f56; }
.dot-yellow { background: #ffbd2e; }
.dot-green { background: #27c93f; }

.terminal-title {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.ai-arch-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 36px;
}

@media (max-width: 992px) {
  .ai-arch-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 560px) {
  .ai-arch-grid {
    grid-template-columns: 1fr;
  }
}

.arch-node-card {
  background: rgba(6, 8, 15, 0.7);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 22px;
  position: relative;
  transition: all 0.3s ease;
}

.arch-node-card:hover {
  border-color: var(--cyan-primary);
  transform: translateY(-4px);
  box-shadow: 0 10px 25px rgba(0, 240, 255, 0.15);
}

.arch-node-number {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--cyan-primary);
  margin-bottom: 10px;
}

.arch-node-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: #FFFFFF;
}

.arch-node-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.ai-code-mock {
  background: #030509;
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-md);
  padding: 20px;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  color: #e2e8f0;
  line-height: 1.7;
  overflow-x: auto;
}

.code-green { color: #00FFB2; }
.code-cyan { color: #00F0FF; }
.code-purple { color: #A855F7; }
.code-dim { color: #64748b; }

/* --------------------------------------------------------------------------
   6. 解决方案与实施保障 (Solutions & Guarantees)
   -------------------------------------------------------------------------- */
.guarantee-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

@media (max-width: 992px) {
  .guarantee-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 560px) {
  .guarantee-grid {
    grid-template-columns: 1fr;
  }
}

.guarantee-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 26px;
  text-align: center;
  transition: all 0.3s ease;
}

.guarantee-card:hover {
  border-color: var(--purple-primary);
  transform: translateY(-4px);
  box-shadow: 0 10px 25px rgba(168, 85, 247, 0.15);
}

.guarantee-icon {
  font-size: 2.2rem;
  margin-bottom: 16px;
  display: inline-block;
}

.guarantee-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 8px;
}

.guarantee-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* --------------------------------------------------------------------------
   7. 业务咨询表单与联系方式 (Contact Section)
   -------------------------------------------------------------------------- */
.contact-wrapper {
  display: grid;
  grid-template-columns: 1fr 1.3fr;
  gap: 40px;
}

@media (max-width: 992px) {
  .contact-wrapper {
    grid-template-columns: 1fr;
  }
}

.contact-info-panel {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 24px;
}

.contact-info-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px;
  backdrop-filter: blur(14px);
}

.company-title-full {
  font-size: 1.35rem;
  font-weight: 800;
  color: #FFFFFF;
  margin-bottom: 10px;
}

.company-domain-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--cyan-primary);
  margin-bottom: 24px;
}

.contact-detail-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.contact-detail-item {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.contact-detail-item .icon {
  width: 22px;
  height: 22px;
  color: var(--cyan-primary);
  flex-shrink: 0;
}

.contact-form-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 36px;
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow-card);
}

.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.form-label .required {
  color: #fb7185;
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 13px 16px;
  border-radius: var(--radius-sm);
  background: rgba(6, 8, 15, 0.7);
  border: 1px solid var(--border-light);
  color: #FFFFFF;
  font-family: inherit;
  font-size: 0.95rem;
  transition: all 0.25s ease;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--cyan-primary);
  box-shadow: 0 0 15px rgba(0, 240, 255, 0.25);
  background: rgba(11, 17, 32, 0.9);
}

.checkbox-group {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}

@media (max-width: 500px) {
  .checkbox-group {
    grid-template-columns: 1fr;
  }
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-subtle);
  transition: all 0.2s ease;
}

.checkbox-label:hover {
  background: rgba(0, 240, 255, 0.06);
  border-color: rgba(0, 240, 255, 0.25);
  color: #FFFFFF;
}

.checkbox-label input[type="checkbox"] {
  accent-color: var(--cyan-primary);
}

/* --------------------------------------------------------------------------
   8. 现代标准 Dialog 模态框 (HTML5 <dialog closedby="any">)
   -------------------------------------------------------------------------- */
dialog {
  border: 1px solid rgba(0, 240, 255, 0.35);
  border-radius: var(--radius-lg);
  background: rgba(11, 17, 32, 0.94);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  color: var(--text-primary);
  padding: 32px;
  max-width: 540px;
  width: 90%;
  margin: auto;
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.8), 0 0 40px rgba(0, 240, 255, 0.15);
}

dialog::backdrop {
  background: rgba(3, 5, 10, 0.82);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.dialog-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 14px;
}

.dialog-title {
  font-size: 1.3rem;
  font-weight: 700;
  color: #FFFFFF;
}

.dialog-close-btn {
  background: transparent;
  border: none;
  font-size: 1.5rem;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px;
  line-height: 1;
  transition: color 0.2s ease;
}

.dialog-close-btn:hover {
  color: #FFFFFF;
}

/* 二维码展示弹窗内容 */
.qrcode-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 16px;
  padding: 10px 0;
}

.qrcode-frame {
  width: 220px;
  height: 220px;
  background: #FFFFFF;
  padding: 12px;
  border-radius: var(--radius-md);
  box-shadow: 0 0 25px rgba(0, 240, 255, 0.3);
}

.qrcode-frame svg {
  width: 100%;
  height: 100%;
}

/* --------------------------------------------------------------------------
   9. 页脚规范 (Footer & ICP备案信息)
   -------------------------------------------------------------------------- */
.site-footer {
  background: #04060A;
  border-top: 1px solid var(--border-subtle);
  padding-top: 70px;
  padding-bottom: 40px;
  position: relative;
  z-index: 2;
}

.footer-top-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.2fr;
  gap: 40px;
  margin-bottom: 60px;
}

@media (max-width: 992px) {
  .footer-top-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .footer-top-grid {
    grid-template-columns: 1fr;
  }
}

.footer-brand-desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin: 16px 0 24px 0;
  max-width: 360px;
}

.footer-column-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 20px;
  position: relative;
}

.footer-nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-nav-item a {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.footer-nav-item a:hover {
  color: var(--cyan-primary);
  padding-left: 4px;
}

/* 备案与版权底部条 */
.footer-bottom-bar {
  border-top: 1px solid var(--border-subtle);
  padding-top: 30px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.88rem;
  color: var(--text-muted);
}

@media (max-width: 768px) {
  .footer-bottom-bar {
    flex-direction: column;
    text-align: center;
    gap: 12px;
  }
}

.footer-copyright {
  color: var(--text-secondary);
}

.footer-beian-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-secondary);
  transition: color 0.25s ease;
}

.footer-beian-link:hover {
  color: var(--cyan-primary);
  text-decoration: underline;
}

.footer-beian-icon {
  width: 16px;
  height: 16px;
  vertical-align: middle;
}