/* ==================== 科技蓝风格设计 ==================== */
    :root {
      --tech-blue: #0066ff;
      --tech-blue-light: #3385ff;
      --tech-blue-dark: #0052cc;
      --tech-cyan: #00d4ff;
      --tech-purple: #6b4cff;
      --tech-glow: rgba(0, 102, 255, 0.3);
      --text-dark: #1a1a2e;
      --text-gray: #6b7280;
      --bg-light: #f0f4f8;
      --bg-cream: #fafbfc;
      --transition-smooth: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    }

    /* 全局动画 */
    @keyframes fadeInUp {
      from { opacity: 0; transform: translateY(40px); }
      to { opacity: 1; transform: translateY(0); }
    }
    @keyframes fadeInDown {
      from { opacity: 0; transform: translateY(-40px); }
      to { opacity: 1; transform: translateY(0); }
    }
    @keyframes fadeInLeft {
      from { opacity: 0; transform: translateX(-50px); }
      to { opacity: 1; transform: translateX(0); }
    }
    @keyframes fadeInRight {
      from { opacity: 0; transform: translateX(50px); }
      to { opacity: 1; transform: translateX(0); }
    }
    @keyframes scaleIn {
      from { opacity: 0; transform: scale(0.8); }
      to { opacity: 1; transform: scale(1); }
    }
    @keyframes rotateIn {
      from { opacity: 0; transform: rotate(-180deg) scale(0.5); }
      to { opacity: 1; transform: rotate(0) scale(1); }
    }
    @keyframes pulse {
      0%, 100% { transform: scale(1); box-shadow: 0 0 0 0 rgba(0, 102, 255, 0.4); }
      50% { transform: scale(1.05); box-shadow: 0 0 20px 10px rgba(0, 102, 255, 0.1); }
    }
    @keyframes float {
      0%, 100% { transform: translateY(0) rotate(0deg); }
      25% { transform: translateY(-15px) rotate(2deg); }
      50% { transform: translateY(-5px) rotate(0deg); }
      75% { transform: translateY(-20px) rotate(-2deg); }
    }
    @keyframes shimmer {
      0% { background-position: -200% 0; }
      100% { background-position: 200% 0; }
    }
    @keyframes gradientShift {
      0% { background-position: 0 50%; }
      50% { background-position: 100% 50%; }
      100% { background-position: 0 50%; }
    }
    @keyframes bounce {
      0%, 100% { transform: translateY(0); }
      50% { transform: translateY(-20px); }
    }
    @keyframes swing {
      0%, 100% { transform: rotate(0deg); }
      25% { transform: rotate(5deg); }
      75% { transform: rotate(-5deg); }
    }
    @keyframes flip {
      0% { transform: perspective(400px) rotateY(0); }
      100% { transform: perspective(400px) rotateY(360deg); }
    }
    @keyframes rubberBand {
      0% { transform: scale3d(1, 1, 1); }
      30% { transform: scale3d(1.25, 0.75, 1); }
      40% { transform: scale3d(0.75, 1.25, 1); }
      50% { transform: scale3d(1.15, 0.85, 1); }
      65% { transform: scale3d(0.95, 1.05, 1); }
      75% { transform: scale3d(1.05, 0.95, 1); }
      100% { transform: scale3d(1, 1, 1); }
    }
    @keyframes jello {
      0%, 100% { transform: skewX(0deg); }
      25% { transform: skewX(-5deg) skewY(-5deg); }
      50% { transform: skewX(5deg) skewY(5deg); }
      75% { transform: skewX(-2deg) skewY(-2deg); }
    }
    @keyframes wobble {
      0% { transform: translateX(0); }
      15% { transform: translateX(-25px) rotate(-5deg); }
      30% { transform: translateX(20px) rotate(3deg); }
      45% { transform: translateX(-15px) rotate(-3deg); }
      60% { transform: translateX(10px) rotate(2deg); }
      75% { transform: translateX(-5px) rotate(-1deg); }
      100% { transform: translateX(0); }
    }
    @keyframes zoomIn {
      from { opacity: 0; transform: scale3d(0.3, 0.3, 0.3); }
      50% { opacity: 1; }
    }
    @keyframes slideInUp {
      from { transform: translate3d(0, 100%, 0); visibility: visible; }
      to { transform: translate3d(0, 0, 0); }
    }
    @keyframes heartbeat {
      0%, 100% { transform: scale(1); }
      14% { transform: scale(1.1); }
      28% { transform: scale(1); }
      42% { transform: scale(1.1); }
      70% { transform: scale(1); }
    }
    @keyframes typing {
      from { width: 0; }
      to { width: 100%; }
    }
    @keyframes blink {
      50% { border-color: transparent; }
    }
    @keyframes glow {
      0%, 100% { box-shadow: 0 0 5px var(--tech-blue), 0 0 10px var(--tech-blue), 0 0 15px var(--tech-blue); }
      50% { box-shadow: 0 0 10px var(--tech-cyan), 0 0 20px var(--tech-cyan), 0 0 30px var(--tech-cyan); }
    }
    @keyframes wave {
      0%, 100% { transform: translateY(0); }
      50% { transform: translateY(-20px); }
    }
    @keyframes morph {
      0%, 100% { border-radius: 60% 40% 30% 70% / 60% 30% 70% 40%; }
      50% { border-radius: 30% 60% 70% 40% / 50% 60% 30% 60%; }
    }
    @keyframes spin3d {
      0% { transform: rotateX(0) rotateY(0) rotateZ(0); }
      100% { transform: rotateX(360deg) rotateY(360deg) rotateZ(360deg); }
    }
    @keyframes elastic {
      0% { transform: scale(0); }
      50% { transform: scale(1.2); }
      100% { transform: scale(1); }
    }
    @keyframes slideRotate {
      0% { transform: translateX(-100%) rotate(-10deg); opacity: 0; }
      100% { transform: translateX(0) rotate(0); opacity: 1; }
    }
    @keyframes flipInX {
      from { transform: perspective(400px) rotate3d(1, 0, 0, 90deg); animation-timing-function: ease-in; opacity: 0; }
      40% { transform: perspective(400px) rotate3d(1, 0, 0, -20deg); animation-timing-function: ease-in; }
      60% { transform: perspective(400px) rotate3d(1, 0, 0, 10deg); opacity: 1; }
      80% { transform: perspective(400px) rotate3d(1, 0, 0, -5deg); }
      to { transform: perspective(400px); }
    }
    @keyframes lightSpeedIn {
      from { transform: translate3d(100%, 0, 0) skewX(-30deg); opacity: 0; }
      60% { transform: skewX(20deg); opacity: 1; }
      80% { transform: skewX(-5deg); }
      to { transform: translate3d(0, 0, 0); }
    }
    @keyframes rollIn {
      from { opacity: 0; transform: translate3d(-100%, 0, 0) rotate3d(0, 0, 1, -120deg); }
      to { opacity: 1; transform: translate3d(0, 0, 0); }
    }

    /* 滚动显示动画 */
    .reveal {
      opacity: 0;
      transform: translateY(50px);
      transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .reveal.active {
      opacity: 1;
      transform: translateY(0);
    }
    .reveal-left {
      opacity: 0;
      transform: translateX(-80px);
      transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .reveal-left.active {
      opacity: 1;
      transform: translateX(0);
    }
    .reveal-right {
      opacity: 0;
      transform: translateX(80px);
      transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .reveal-right.active {
      opacity: 1;
      transform: translateX(0);
    }
    .reveal-scale {
      opacity: 0;
      transform: scale(0.5);
      transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .reveal-scale.active {
      opacity: 1;
      transform: scale(1);
    }
    .reveal-rotate {
      opacity: 0;
      transform: rotate(-15deg) scale(0.8);
      transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .reveal-rotate.active {
      opacity: 1;
      transform: rotate(0) scale(1);
    }
    .reveal-flip {
      opacity: 0;
      transform: perspective(400px) rotateY(90deg);
      transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .reveal-flip.active {
      opacity: 1;
      transform: perspective(400px) rotateY(0);
    }
    .reveal-elastic {
      opacity: 0;
      transform: scale(0);
      transition: all 0.6s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    }
    .reveal-elastic.active {
      opacity: 1;
      transform: scale(1);
    }

    /* 延迟动画类 */
    .delay-100 { transition-delay: 0.1s; }
    .delay-200 { transition-delay: 0.2s; }
    .delay-300 { transition-delay: 0.3s; }
    .delay-400 { transition-delay: 0.4s; }
    .delay-500 { transition-delay: 0.5s; }
    .delay-600 { transition-delay: 0.6s; }
    .delay-700 { transition-delay: 0.7s; }
    .delay-800 { transition-delay: 0.8s; }

    /* 悬停动画类 */
    .hover-float:hover { animation: float 2s ease-in-out infinite; }
    .hover-pulse:hover { animation: pulse 1s ease-in-out infinite; }
    .hover-rubber:hover { animation: rubberBand 1s ease; }
    .hover-jello:hover { animation: jello 0.9s ease; }
    .hover-wobble:hover { animation: wobble 1s ease; }
    .hover-heartbeat:hover { animation: heartbeat 1.5s ease-in-out infinite; }
    .hover-flip:hover { animation: flip 0.6s ease; }
    .hover-swing:hover { animation: swing 1s ease; }
    .hover-bounce:hover { animation: bounce 1s ease infinite; }
    .hover-glow:hover { animation: glow 1.5s ease-in-out infinite; }
    .hover-morph:hover { animation: morph 2s ease-in-out infinite; }
    .hover-spin3d:hover { animation: spin3d 2s linear infinite; }

    /* ==================== 滚动吸顶导航栏 ==================== */
    .tech-header {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      z-index: 1000;
      background: linear-gradient(to bottom, rgba(0,0,0,0.55) 0%, rgba(0,0,0,0.3) 50%, transparent 100%);
      transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .tech-header.scrolled {
      background: rgba(255, 255, 255, 0.98);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    }
    /* 导航栏底部淡灰色阴影过渡 */
    .tech-header::after {
      content: '';
      position: absolute;
      bottom: -60px;
      left: 0;
      right: 0;
      height: 60px;
      background: linear-gradient(to bottom, rgba(0,0,0,0.15) 0%, rgba(0,0,0,0.05) 40%, transparent 100%);
      pointer-events: none;
      opacity: 0;
      transition: opacity 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .tech-header.scrolled::after {
      opacity: 1;
    }
    .tech-header-inner {
      max-width: 1400px;
      margin: 0 auto;
      padding: 0 5rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 100px;
      transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .tech-header.scrolled .tech-header-inner {
      height: 100px;
    }

    /* Logo 向左移动 */
    .tech-logo {
      margin-left: -8rem;
      display: flex;
      align-items: center;
      gap: 1rem;
      text-decoration: none;
      transition: all 0.4s ease;
    }

    /* 右侧工具 向右移动 */
    .tech-header-tools {
      margin-right: -8rem;
    }
    .tech-logo img {
      height: 60px;
      transition: all 0.4s ease;
    }
    .tech-header.scrolled .tech-logo img {
      height: 50px;
    }
    .tech-logo-text {
      display: flex;
      flex-direction: column;
    }
    .tech-logo-title {
      font-size: 1.6rem;
      font-weight: 700;
      color: white;
      letter-spacing: 1px;
      transition: all 0.4s ease;
    }
    .tech-header.scrolled .tech-logo-title {
      font-size: 1.4rem;
      background: linear-gradient(135deg, var(--tech-blue) 0%, var(--tech-cyan) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    /* 导航容器 */
    .tech-nav-container {
      display: flex;
      flex-direction: column;
      align-items: flex-start;
      gap: 0.3rem;
      margin-left: auto;
      margin-right: 2rem;
    }

    /* 上面一行：剩余栏目和搜索 */
    .tech-nav-top {
      width: 100%;
    }

    .tech-nav-secondary {
      display: flex;
      justify-content: flex-end;
      align-items: center;
      gap: 1rem;
      font-size: 0.85rem;
    }

    /* 下面一行：首页 + 前10个栏目 */
    .tech-nav-bottom {
      width: 100%;
    }

    .tech-nav-primary {
      display: flex;
      justify-content: flex-start;
      align-items: center;
      gap: 1rem;
      font-size: 1rem;
    }

    /* 主导航 - 居中 */
    .tech-nav {
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 1rem;
      position: absolute;
      left: 50%;
      transform: translateX(-50%);
    }
    .tech-nav-item {
      position: relative;
    }
    .tech-nav-link {
      display: block;
      padding: 0.3rem 0.8rem;
      color: white;
      text-decoration: none;
      font-size: 1rem;
      font-weight: 500;
      transition: all 0.3s ease;
      position: relative;
    }
    .tech-header.scrolled .tech-nav-link {
      color: var(--text-dark);
    }
    .tech-nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      width: 0;
      height: 2px;
      background: white;
      transition: all 0.3s ease;
      transform: translateX(-50%);
      border-radius: 1px;
    }
    .tech-header.scrolled .tech-nav-link::after {
      background: linear-gradient(90deg, var(--tech-blue), var(--tech-cyan));
    }
    .tech-nav-link:hover::after,
    .tech-nav-link.active::after {
      width: 50%;
    }
    .tech-nav-link:hover,
    .tech-nav-link.active {
      opacity: 0.9;
    }
    .tech-header.scrolled .tech-nav-link:hover,
    .tech-header.scrolled .tech-nav-link.active {
      color: var(--tech-blue);
    }

    /* 顶部导航栏特殊样式 */
    .tech-nav-secondary .tech-nav-link {
      font-size: 0.85rem;
      padding: 0.2rem 0.6rem;
    }

    /* 搜索框在顶部导航栏中的样式 */
    .tech-nav-secondary .tech-header-tools {
      margin-right: 0;
      display: flex;
      align-items: center;
    }
    .tech-nav-secondary .tech-search-box {
      display: flex;
      align-items: center;
    }
    .tech-nav-secondary .tech-search-input {
      width: 140px;
      padding: 0.3rem 1.8rem 0.3rem 0.8rem;
      border: 1px solid rgba(255, 255, 255, 0.3);
      border-radius: 15px;
      background: rgba(255, 255, 255, 0.1);
      color: white;
      font-size: 0.85rem;
    }
    .tech-nav-secondary .tech-search-input::placeholder {
      color: rgba(255, 255, 255, 0.7);
      font-size: 0.85rem;
    }
    .tech-header.scrolled .tech-nav-secondary .tech-search-input {
      border-color: rgba(0, 0, 0, 0.2);
      background: rgba(255, 255, 255, 0.9);
      color: var(--text-dark);
    }
    .tech-header.scrolled .tech-nav-secondary .tech-search-input::placeholder {
      color: var(--text-gray);
    }
    .tech-nav-secondary .tech-search-input:focus {
      width: 180px;
      outline: none;
      border-color: rgba(255, 255, 255, 0.6);
      background: rgba(255, 255, 255, 0.15);
    }
    .tech-header.scrolled .tech-nav-secondary .tech-search-input:focus {
      border-color: var(--tech-blue);
      box-shadow: 0 0 0 2px rgba(0, 102, 255, 0.1);
    }
    .tech-nav-secondary .tech-search-btn {
      position: absolute;
      right: 3px;
      background: transparent;
      color: white;
      border: none;
      width: 28px;
      height: 28px;
      border-radius: 50%;
      cursor: pointer;
      transition: all 0.3s ease;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 0.8rem;
    }
    .tech-header.scrolled .tech-nav-secondary .tech-search-btn {
      background: transparent;
      color: var(--text-gray);
    }
    .tech-nav-secondary .tech-search-btn:hover {
      transform: scale(1.1);
    }

    /* 右侧工具 */
    .tech-header-tools {
      display: flex;
      align-items: center;
      gap: 1.5rem;
    }
    .tech-search-box {
      position: relative;
      display: flex;
      align-items: center;
    }
    .tech-search-input {
      width: 220px;
      padding: 0.7rem 2.5rem 0.7rem 1.2rem;
      border: 1px solid rgba(255, 255, 255, 0.3);
      border-radius: 25px;
      background: rgba(255, 255, 255, 0.15);
      color: white;
      font-size: 1rem;
      transition: all 0.3s ease;
    }
    .tech-search-input::placeholder {
      color: rgba(255, 255, 255, 0.7);
    }
    .tech-header.scrolled .tech-search-input {
      border-color: rgba(0, 102, 255, 0.2);
      background: var(--bg-cream);
      color: var(--text-dark);
    }
    .tech-header.scrolled .tech-search-input::placeholder {
      color: var(--text-gray);
    }
    .tech-search-input:focus {
      width: 260px;
      outline: none;
      border-color: rgba(255, 255, 255, 0.6);
      background: rgba(255, 255, 255, 0.25);
    }
    .tech-header.scrolled .tech-search-input:focus {
      border-color: var(--tech-blue);
      box-shadow: 0 0 0 4px rgba(0, 102, 255, 0.1);
    }
    .tech-search-btn {
      position: absolute;
      right: 5px;
      background: white;
      color: var(--tech-blue);
      border: none;
      width: 36px;
      height: 36px;
      border-radius: 50%;
      cursor: pointer;
      transition: all 0.3s ease;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 0.9rem;
    }
    a {
      color: inherit;
      text-decoration: none;
    }
    .tech-header.scrolled .tech-search-btn {
      background: linear-gradient(135deg, var(--tech-blue) 0%, var(--tech-cyan) 100%);
      color: white;
    }
    .tech-search-btn:hover {
      transform: scale(1.1);
    }
    .tech-lang-switch {
      display: flex;
      gap: 0.5rem;
    }
    .tech-lang-btn {
      padding: 0.5rem 1rem;
      border: 1px solid rgba(255, 255, 255, 0.3);
      background: transparent;
      color: white;
      font-size: 0.95rem;
      border-radius: 20px;
      cursor: pointer;
      transition: all 0.3s ease;
    }
    .tech-header.scrolled .tech-lang-btn {
      border-color: rgba(0, 102, 255, 0.2);
      color: var(--text-gray);
    }
    .tech-lang-btn:hover, .tech-lang-btn.active {
      background: white;
      color: var(--tech-blue);
      border-color: white;
    }
    .tech-header.scrolled .tech-lang-btn:hover,
    .tech-header.scrolled .tech-lang-btn.active {
      background: linear-gradient(135deg, var(--tech-blue) 0%, var(--tech-cyan) 100%);
      color: white;
      border-color: transparent;
    }

    /* 移动端菜单按钮 */
    .tech-mobile-menu-btn {
      display: none;
      flex-direction: column;
      gap: 5px;
      padding: 8px;
      background: transparent;
      border: none;
      cursor: pointer;
      z-index: 1001;
    }
    .tech-mobile-menu-btn span {
      display: block;
      width: 24px;
      height: 2px;
      background: white;
      transition: all 0.3s ease;
      border-radius: 1px;
    }
    .tech-header.scrolled .tech-mobile-menu-btn span {
      background: var(--text-dark);
    }

    /* 下拉菜单 */
    .tech-dropdown {
      position: absolute;
      top: 100%;
      left: 50%;
      transform: translateX(-50%) translateY(10px);
      background: white;
      min-width: 220px;
      padding: 1rem 0;
      border-radius: 12px;
      box-shadow: 0 20px 50px rgba(0, 102, 255, 0.2);
      opacity: 0;
      visibility: hidden;
      transition: var(--transition-smooth);
      z-index: 1001;
      border: 1px solid rgba(0, 102, 255, 0.1);
    }
    .tech-nav-item:hover .tech-dropdown {
      opacity: 1;
      visibility: visible;
      transform: translateX(-50%) translateY(0);
    }
    .tech-dropdown-item {
      display: block;
      padding: 0.8rem 1.5rem;
      color: var(--text-dark);
      text-decoration: none;
      font-size: 0.95rem;
      transition: var(--transition-smooth);
      border-left: 3px solid transparent;
      position: relative;
      overflow: hidden;
    }
    .tech-dropdown-item::before {
      content: '';
      position: absolute;
      left: 0;
      top: 0;
      height: 100%;
      width: 0;
      background: linear-gradient(90deg, rgba(0, 102, 255, 0.1), transparent);
      transition: width 0.3s ease;
    }
    .tech-dropdown-item:hover::before {
      width: 100%;
    }
    .tech-dropdown-item:hover {
      color: var(--tech-blue);
      border-left-color: var(--tech-blue);
      padding-left: 1.8rem;
    }

    /* ==================== Hero轮播区 ==================== */
    .tech-hero {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      height: 100vh;
      min-height: 700px;
      z-index: 1;
    }
    .tech-hero-slider {
      position: relative;
      height: 100%;
    }
    .tech-hero-slide {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      opacity: 0;
      transition: opacity 1.5s ease-in-out;
    }
    .tech-hero-slide.active {
      opacity: 1;
    }
    .tech-hero-slide img,
    .tech-hero-slide video {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .tech-hero-link {
      display: block;
      width: 100%;
      height: 100%;
      position: absolute;
      top: 0;
      left: 0;
      z-index: 5;
    }
    .tech-hero-overlay {
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      background: linear-gradient(180deg,
        rgba(0, 20, 60, 0.4) 0%,
        rgba(0, 40, 100, 0.2) 40%,
        rgba(0, 60, 120, 0.3) 70%,
        rgba(0, 102, 255, 0.5) 100%);
    }
    .tech-hero-content {
      position: absolute;
      bottom: 3%;
      left: 2%;
      text-align: left;
      color: white;
      z-index: 10;
      width: 70%;
      max-width: 800px;
    }
    .tech-hero-title {
      font-size: clamp(1.2rem, 2vw, 1.8rem);
      font-weight: 600;
      margin-bottom: 0.5rem;
      text-shadow: 2px 2px 10px rgba(0, 0, 0, 0.6);
      color: white;
      line-height: 1.3;
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
    }

    .tech-hero-search input {
      flex: 1;
      padding: 1.2rem 1.5rem;
      border: none;
      border-radius: 50px 0 0 50px;
      font-size: 1rem;
      background: rgba(255,255,255,0.95);
      box-shadow: 0 10px 40px rgba(0, 102, 255, 0.2);
    }
    .tech-hero-search input:focus {
      outline: none;
    }
    .tech-hero-search button {
      padding: 1.2rem 2.5rem;
      background: linear-gradient(135deg, var(--tech-blue) 0%, var(--tech-cyan) 100%);
      color: white;
      border: none;
      border-radius: 0 50px 50px 0;
      font-size: 1rem;
      cursor: pointer;
      transition: var(--transition-smooth);
      font-weight: 600;
    }
    .tech-hero-search button:hover {
      background: linear-gradient(135deg, var(--tech-blue-dark) 0%, var(--tech-blue) 100%);
      transform: scale(1.02);
      box-shadow: 0 10px 30px rgba(0, 102, 255, 0.4);
    }

    /* 轮播指示器 */
    .tech-hero-indicators {
      position: absolute;
      bottom: 3%;
      right: 2%;
      display: flex;
      gap: 0.8rem;
      z-index: 10;
    }
    .tech-hero-dot {
      width: 14px;
      height: 14px;
      border-radius: 50%;
      background: rgba(255,255,255,0.4);
      cursor: pointer;
      transition: var(--transition-smooth);
      border: 2px solid transparent;
    }
    .tech-hero-dot.active {
      background: white;
      transform: scale(1.3);
      border-color: var(--tech-cyan);
      box-shadow: 0 0 15px var(--tech-cyan);
    }
    .tech-hero-dot:hover {
      background: white;
      transform: scale(1.2);
    }

    /* 滚动提示 */
    .tech-scroll-hint i {
      display: block;
      text-align: center;
      margin-top: 0.5rem;
      font-size: 1.2rem;
    }

    /* ==================== 快捷入口 ==================== */
    .tech-quick-access {
      background: linear-gradient(135deg, var(--tech-blue) 0%, var(--tech-purple) 50%, var(--tech-blue-dark) 100%);
      background-size: 200% 200%;
      animation: gradientShift 8s ease infinite;
      padding: 4rem 0;
      position: relative;
      z-index: 10;
      overflow: hidden;
    }
    .tech-quick-access::before {
      content: '';
      position: absolute;
      top: -50%;
      left: -50%;
      width: 200%;
      height: 200%;
      background: radial-gradient(circle, rgba(255,255,255,0.1) 1px, transparent 1px);
      background-size: 40px 40px;
      animation: shimmer 20s linear infinite;
    }
    .tech-quick-access::after {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 86.6"><polygon points="25,0 75,0 100,43.3 75,86.6 25,86.6 0,43.3" fill="none" stroke="rgba(255,255,255,0.08)" stroke-width="1"/><polygon points="75,0 125,0 150,43.3 125,86.6 75,86.6 50,43.3" fill="none" stroke="rgba(255,255,255,0.08)" stroke-width="1"/><polygon points="-25,0 25,0 50,43.3 25,86.6 -25,86.6 -50,43.3" fill="none" stroke="rgba(255,255,255,0.08)" stroke-width="1"/><polygon points="25,86.6 75,86.6 100,129.9 75,173.2 25,173.2 0,129.9" fill="none" stroke="rgba(255,255,255,0.08)" stroke-width="1"/><polygon points="25,-86.6 75,-86.6 100,-43.3 75,0 25,0 0,-43.3" fill="none" stroke="rgba(255,255,255,0.08)" stroke-width="1"/></svg>');
      background-size: 50px 43.3px;
      animation: moveBg 30s linear infinite;
    }
    .tech-quick-access-inner {
      max-width: 1400px;
      margin: 0 auto;
      padding: 0 2rem;
      position: relative;
      z-index: 1;
    }
    .tech-quick-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
      gap: 2rem;
    }
    .tech-quick-item {
      background: rgba(255,255,255,0.1);
      backdrop-filter: blur(10px);
      border: 1px solid rgba(255,255,255,0.2);
      border-radius: 16px;
      padding: 2rem 1rem;
      text-align: center;
      color: white;
      text-decoration: none;
      transition: var(--transition-smooth);
      position: relative;
      overflow: hidden;
    }
    .tech-quick-item::before {
      content: '';
      position: absolute;
      top: 0;
      left: -100%;
      width: 100%;
      height: 100%;
      background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
      transition: 0.6s;
    }
    .tech-quick-item:hover::before {
      left: 100%;
    }
    .tech-quick-item:hover {
      transform: translateY(-10px) scale(1.02);
      background: rgba(255,255,255,0.2);
      box-shadow: 0 20px 40px rgba(0,0,0,0.2), 0 0 30px rgba(0, 212, 255, 0.3);
      border-color: var(--tech-cyan);
    }
    .tech-quick-icon {
      width: 60px;
      height: 60px;
      background: rgba(255,255,255,0.2);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 1rem;
      font-size: 1.5rem;
      transition: var(--transition-smooth);
    }
    .tech-quick-item:hover .tech-quick-icon {
      background: white;
      color: var(--tech-blue);
      transform: scale(1.15) rotate(360deg);
      box-shadow: 0 0 20px rgba(255,255,255,0.5);
    }
    .tech-quick-title {
      font-size: 1.1rem;
      font-weight: 600;
      margin-bottom: 0.5rem;
    }
    .tech-quick-desc {
      font-size: 0.85rem;
      opacity: 0.9;
    }

    /* ==================== 新闻区域 ==================== */
    .tech-section {
      padding: 6rem 0;
      position: relative;
      z-index: 10;
      background: white;
      margin-top: 100vh;
    }
    .tech-section-inner {
      max-width: 1400px;
      margin: 0 auto;
      padding: 0 2rem;
    }
    .tech-section-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 3rem;
      position: relative;
    }
    .tech-section-header::after {
      content: '';
      position: absolute;
      bottom: -1rem;
      left: 0;
      width: 80px;
      height: 4px;
      background: linear-gradient(90deg, var(--tech-blue), var(--tech-cyan));
      border-radius: 2px;
    }
    .tech-section-title {
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--text-dark);
      display: flex;
      align-items: center;
      gap: 1rem;
    }
    .tech-section-title i {
      background: linear-gradient(135deg, var(--tech-blue) 0%, var(--tech-cyan) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .tech-section-more {
      color: var(--tech-blue);
      text-decoration: none;
      font-size: 1rem;
      font-weight: 500;
      display: flex;
      align-items: center;
      gap: 0.5rem;
      transition: var(--transition-smooth);
      padding: 0.5rem 1rem;
      border-radius: 25px;
    }
    .tech-section-more:hover {
      gap: 1rem;
      background: rgba(0, 102, 255, 0.1);
      transform: translateX(5px);
    }

    /* 新闻布局 */
    .tech-news-layout {
      display: grid;
      grid-template-columns: 1.2fr 1fr;
      gap: 2.5rem;
    }
    .tech-news-featured {
      position: relative;
      border-radius: 20px;
      overflow: hidden;
      box-shadow: 0 15px 50px rgba(0, 102, 255, 0.15);
      transition: var(--transition-smooth);
      height: 100%;
    }
    .tech-news-featured > a {
      display: block;
      height: 100%;
    }
    .tech-news-featured:hover {
      transform: translateY(-8px) scale(1.01);
      box-shadow: 0 25px 60px rgba(0, 102, 255, 0.25);
    }
    .tech-news-featured img {
      width: 100%;
      height: 100%;
      min-height: 420px;
      object-fit: cover;
      transition: transform 0.8s ease;
    }
    .tech-news-featured:hover img {
      transform: scale(1.08);
    }
    .tech-news-featured-overlay {
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      padding: 2.5rem;
      background: linear-gradient(transparent, rgba(0, 20, 60, 0.9));
      color: white;
    }
    .tech-news-featured-tag {
      display: inline-block;
      background: linear-gradient(135deg, var(--tech-blue) 0%, var(--tech-cyan) 100%);
      color: white;
      padding: 0.4rem 1rem;
      border-radius: 20px;
      font-size: 0.85rem;
      margin-bottom: 1rem;
      font-weight: 500;
    }
    .tech-news-featured-title {
      font-size: 1.5rem;
      font-weight: 600;
      margin-bottom: 0.8rem;
      line-height: 1.4;
    }
    .tech-news-featured-date {
      font-size: 0.95rem;
      opacity: 0.9;
    }

    /* 新闻列表 */
    .tech-news-list {
      display: flex;
      flex-direction: column;
      gap: 1.2rem;
    }
    .tech-news-item {
      display: flex;
      gap: 1.2rem;
      padding: 1.5rem;
      background: white;
      border-radius: 16px;
      box-shadow: 0 4px 15px rgba(0, 102, 255, 0.08);
      transition: var(--transition-smooth);
      text-decoration: none;
      color: var(--text-dark);
      border-left: 4px solid transparent;
      position: relative;
      overflow: hidden;
    }
    .tech-news-item::before {
      content: '';
      position: absolute;
      left: 0;
      top: 0;
      height: 100%;
      width: 0;
      background: linear-gradient(90deg, rgba(0, 102, 255, 0.1), transparent);
      transition: width 0.4s ease;
    }
    .tech-news-item:hover::before {
      width: 100%;
    }
    .tech-news-item:hover {
      transform: translateX(8px);
      box-shadow: 0 5px 20px rgba(0, 102, 255, 0.1);
      border-left-color: var(--tech-blue);
    }
    .tech-news-item-date {
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-width: 70px;
      padding: 0.8rem;
      background: linear-gradient(135deg, var(--bg-cream) 0%, #e8f0ff 100%);
      border-radius: 12px;
      color: var(--tech-blue);
      transition: var(--transition-smooth);
    }
    .tech-news-item:hover .tech-news-item-date {
      background: linear-gradient(135deg, var(--tech-blue) 0%, var(--tech-cyan) 100%);
      color: white;
      transform: scale(1.05);
    }
    .tech-news-item-day {
      font-size: 1.8rem;
      font-weight: 700;
      line-height: 1;
    }
    .tech-news-item-month {
      font-size: 0.8rem;
      opacity: 0.9;
    }
    .tech-news-item-content {
      flex: 1;
    }
    .tech-news-item-title {
      font-size: 1.1rem;
      font-weight: 600;
      margin-bottom: 0.6rem;
      line-height: 1.5;
      display: -webkit-box;
      -webkit-line-clamp: 2;
      -webkit-box-orient: vertical;
      overflow: hidden;
      transition: var(--transition-smooth);
    }
    .tech-news-item:hover .tech-news-item-title {
      color: var(--tech-blue);
    }
    .tech-news-item-meta {
      font-size: 0.9rem;
      color: var(--text-gray);
    }

    /* ==================== 三栏信息区 ==================== */
    .tech-info-section {
      background: var(--bg-light);
      padding: 6rem 0;
      position: relative;
      z-index: 10;
      overflow: hidden;
    }
    .tech-info-section::before {
      content: '';
      position: absolute;
      top: -100px;
      right: -100px;
      width: 400px;
      height: 400px;
      background: radial-gradient(circle, rgba(0, 102, 255, 0.05) 0%, transparent 70%);
      border-radius: 50%;
    }
    .tech-info-section::after {
      content: '';
      position: absolute;
      bottom: -100px;
      left: -100px;
      width: 300px;
      height: 300px;
      background: radial-gradient(circle, rgba(0, 212, 255, 0.05) 0%, transparent 70%);
      border-radius: 50%;
    }
    .tech-info-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2.5rem;
      position: relative;
      z-index: 1;
    }
    .tech-info-card {
      background: white;
      border-radius: 20px;
      padding: 2.5rem;
      box-shadow: 0 8px 30px rgba(0, 102, 255, 0.08);
      transition: var(--transition-smooth);
      position: relative;
      overflow: hidden;
    }
    .tech-info-card::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 5px;
      background: linear-gradient(90deg, var(--tech-blue), var(--tech-cyan));
      transform: scaleX(0);
      transform-origin: left;
      transition: transform 0.5s ease;
    }
    .tech-info-card:hover::before {
      transform: scaleX(1);
    }
    .tech-info-card:hover {
      transform: translateY(-10px) scale(1.02);
      box-shadow: 0 20px 50px rgba(0, 102, 255, 0.15);
    }
    .tech-info-card-header {
      display: flex;
      align-items: center;
      gap: 1.2rem;
      margin-bottom: 2rem;
      padding-bottom: 1.2rem;
      border-bottom: 2px solid #f0f0f0;
    }
    .tech-info-card-icon {
      width: 60px;
      height: 60px;
      background: linear-gradient(135deg, var(--tech-blue) 0%, var(--tech-cyan) 100%);
      border-radius: 16px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 1.5rem;
      transition: var(--transition-smooth);
      box-shadow: 0 8px 20px rgba(0, 102, 255, 0.3);
    }
    .tech-info-card:hover .tech-info-card-icon {
      transform: rotate(15deg) scale(1.1);
      box-shadow: 0 12px 30px rgba(0, 102, 255, 0.4);
    }
    .tech-info-card-title {
      font-size: 1.3rem;
      font-weight: 700;
      color: var(--text-dark);
    }
    .tech-info-list {
      list-style: none;
      padding: 0;
      margin: 0;
    }
    .tech-info-list-item {
      padding: 1rem 0;
      border-bottom: 1px solid #f0f0f0;
      transition: var(--transition-smooth);
      position: relative;
    }
    .tech-info-list-item:last-child {
      border-bottom: none;
    }
    .tech-info-list-item:hover {
      padding-left: 15px;
    }
    .tech-info-list-item a {
      color: var(--text-dark);
      text-decoration: none;
      font-size: 1rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      transition: var(--transition-smooth);
    }
    .tech-info-list-item:hover a {
      color: var(--tech-blue);
    }
    .tech-info-list-item a::after {
      content: '→';
      opacity: 0;
      transition: var(--transition-smooth);
      color: var(--tech-blue);
      font-weight: bold;
    }
    .tech-info-list-item:hover a::after {
      opacity: 1;
      transform: translateX(5px);
    }

    /* ==================== 校训区域 ==================== */
    .tech-motto-section {
      background: linear-gradient(180deg, var(--bg-light) 0%, white 50%, var(--bg-light) 100%);
      padding: 8rem 0;
      text-align: center;
      position: relative;
      z-index: 10;
      overflow: hidden;
    }
    .tech-motto-section::before {
      content: '';
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      width: 800px;
      height: 800px;
      background: radial-gradient(circle, rgba(0, 102, 255, 0.05) 0%, transparent 60%);
      border-radius: 50%;
    }
    .tech-motto-title {
      font-size: 3.5rem;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 4rem;
      position: relative;
      display: inline-block;
    }
    .tech-motto-title::after {
      content: '';
      position: absolute;
      bottom: -15px;
      left: 50%;
      transform: translateX(-50%);
      width: 80px;
      height: 4px;
      background: linear-gradient(90deg, var(--tech-blue), var(--tech-cyan));
      border-radius: 2px;
    }
    .tech-motto-content {
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 2rem;
      flex-wrap: wrap;
      position: relative;
      z-index: 1;
    }
    .tech-motto-group {
      text-align: center;
      transition: var(--transition-smooth);
    }
    .tech-motto-group:hover {
      transform: translateY(-10px);
    }
    .tech-motto-char {
      font-size: 4.5rem;
      font-weight: 800;
      background: linear-gradient(135deg, var(--tech-blue) 0%, var(--tech-cyan) 50%, var(--tech-purple) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      line-height: 1;
      text-shadow: none;
      transition: var(--transition-smooth);
      display: inline-block;
      margin: 0 0.3rem;
    }
    .tech-motto-group:hover .tech-motto-char {
      transform: scale(1.1);
    }
    .tech-motto-dot {
      font-size: 3rem;
      font-weight: 700;
      color: var(--tech-blue);
      opacity: 0.5;
      user-select: none;
      margin-top: -2rem;
    }
    .tech-motto-pinyin {
      font-size: 1rem;
      color: var(--text-gray);
      letter-spacing: 2px;
      font-weight: 500;
      margin-top: 0.5rem;
    }

    /* ==================== 学院设置 ==================== */
    .tech-college-section {
      padding: 5rem 0;
      background: #f8f9fa;
      position: relative;
      z-index: 10;
    }
    .tech-college-container {
      max-width: 1400px;
      margin: 0 auto;
      padding: 0 2rem;
    }
    .tech-section-desc {
      text-align: center;
      color: var(--text-gray);
      font-size: 0.95rem;
      margin-top: 0.5rem;
    }
    .tech-college-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1.5rem;
      margin-top: 3rem;
    }
    .tech-college-item {
      display: block;
      border-radius: 12px;
      overflow: hidden;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
      transition: var(--transition-smooth);
    }
    .tech-college-item:hover {
      transform: translateY(-8px);
      box-shadow: 0 12px 30px rgba(0, 102, 255, 0.2);
    }
    .tech-college-item img {
      width: 100%;
      height: auto;
      display: block;
      transition: transform 0.5s ease;
    }
    .tech-college-item:hover img {
      transform: scale(1.05);
    }
    @media (max-width: 992px) {
      .tech-college-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 576px) {
      .tech-college-grid {
        grid-template-columns: 1fr;
      }
    }

    /* ==================== 校园全景 ==================== */
    .tech-panorama-section {
      padding: 5rem 0;
      background: #f8f9fa;
      position: relative;
      z-index: 10;
    }
    .tech-panorama-container {
      max-width: 1400px;
      margin: 0 auto;
      padding: 0 2rem;
    }
    .tech-panorama-frame {
      width: 100%;
      height: 579px;
      border: none;
      border-radius: 12px;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
      transition: var(--transition-smooth);
      margin-top: 2rem;
    }
    .tech-panorama-frame:hover {
      box-shadow: 0 12px 30px rgba(0, 102, 255, 0.2);
    }
    @media (max-width: 768px) {
      .tech-panorama-frame {
        height: 350px;
      }
    }

    /* ==================== 底部 ==================== */
    .tech-footer {
      background: linear-gradient(180deg, #0a1628 0%, #050d18 100%);
      color: white;
      padding: 5rem 0 2rem;
      position: relative;
      z-index: 10;
      overflow: hidden;
    }
    .tech-footer-inner {
      max-width: 1400px;
      margin: 0 auto;
      padding: 0 2rem;
      position: relative;
      z-index: 1;
    }
    .tech-footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 4rem;
      margin-bottom: 4rem;
    }
    .tech-footer-brand img {
      height: 65px;
      margin-bottom: 1.5rem;
      transition: var(--transition-smooth);
    }
    .tech-footer-brand:hover img {
      transform: scale(1.05);
    }
    .tech-footer-desc {
      color: #8b9bb4;
      font-size: 0.95rem;
      line-height: 1.9;
      margin-bottom: 2rem;
    }

    .tech-footer-title {
      font-size: 1.2rem;
      font-weight: 600;
      margin-bottom: 2rem;
      color: white;
      position: relative;
      padding-bottom: 1rem;
    }
    .tech-footer-title::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 40px;
      height: 3px;
      background: linear-gradient(90deg, var(--tech-blue), var(--tech-cyan));
      border-radius: 2px;
    }
    .tech-footer-links {
      list-style: none;
      padding: 0;
      margin: 0;
    }
    .tech-footer-links li {
      margin-bottom: 1rem;
    }
    .tech-footer-links a {
      color: #8b9bb4;
      text-decoration: none;
      font-size: 0.95rem;
      transition: var(--transition-smooth);
      display: inline-block;
      position: relative;
    }
    .tech-footer-links a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0;
      height: 2px;
      background: linear-gradient(90deg, var(--tech-blue), var(--tech-cyan));
      transition: width 0.3s ease;
    }
    .tech-footer-links a:hover {
      color: white;
      transform: translateX(8px);
    }
    .tech-footer-links a:hover::after {
      width: 100%;
    }
    .tech-contact-info li {
      font-size: 0.95rem;
      line-height: 1.6;
      white-space: nowrap;
    }
    .tech-footer-bottom {
      border-top: 1px solid rgba(0, 102, 255, 0.2);
      padding-top: 2.5rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 1.5rem;
    }
    .tech-footer-copyright {
      color: #5a6a85;
      font-size: 0.9rem;
    }
    .tech-footer-copyright a {
      color: #8b9bb4;
      text-decoration: none;
      transition: color 0.3s ease;
    }
    .tech-footer-copyright a:hover {
      color: var(--tech-cyan);
    }

    /* 返回顶部 */
    /* 下拉菜单 */
    .tech-dropdown {
      position: absolute;
      top: 100%;
      left: 50%;
      transform: translateX(-50%) translateY(10px);
      background: white;
      min-width: 200px;
      padding: 0.8rem 0;
      border-radius: 12px;
      box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
      opacity: 0;
      visibility: hidden;
      transition: all 0.3s ease;
      z-index: 1001;
    }
    .tech-nav-item:hover .tech-dropdown {
      opacity: 1;
      visibility: visible;
      transform: translateX(-50%) translateY(0);
    }
    .tech-dropdown-item {
      display: block;
      padding: 0.7rem 1.2rem;
      color: var(--text-dark);
      text-decoration: none;
      font-size: 0.9rem;
      transition: all 0.3s ease;
    }
    .tech-dropdown-item:hover {
      color: var(--tech-blue);
      background: rgba(0, 102, 255, 0.05);
      padding-left: 1.5rem;
    }

    /* ==================== 响应式 ==================== */
    @media (max-width: 1200px) {
      .tech-info-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .tech-footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .tech-motto-content {
        gap: 1.5rem;
      }
      .tech-motto-char {
        font-size: 3.5rem;
      }
      .tech-motto-dot {
        font-size: 2.5rem;
        margin-top: -1.5rem;
      }
    }
    @media (max-width: 992px) {
      .tech-news-layout {
        grid-template-columns: 1fr;
      }

      .tech-motto-content {
        gap: 1.2rem;
      }
      .tech-motto-char {
        font-size: 3rem;
      }
      .tech-motto-dot {
        font-size: 2rem;
        margin-top: -1.2rem;
      }

      .tech-nav-item {
        width: 100%;
        border-bottom: 1px solid #eee;
      }
      .tech-nav-link {
        color: var(--text-dark) !important;
        padding: 1rem 0;
        font-size: 1.1rem;
      }
      .tech-mobile-menu-btn {
        display: flex;
      }
      .tech-header-tools .tech-search-box,
      .tech-header-tools .tech-lang-switch {
        display: none;
      }
    }
    @media (max-width: 768px) {
      .tech-header-inner {
        padding: 0 2rem;
        height: 90px;
      }
      .tech-header.scrolled .tech-header-inner {
        height: 70px;
      }
      .tech-logo {
        margin-left: -4rem;
      }
      .tech-header-tools {
        margin-right: -4rem;
      }
      .tech-logo img {
        height: 50px;
      }
      .tech-header.scrolled .tech-logo img {
        height: 40px;
      }
      .tech-logo-title {
        font-size: 1.3rem;
      }
      .tech-info-grid {
        grid-template-columns: 1fr;
      }

      .tech-footer-grid {
        grid-template-columns: 1fr;
        gap: 2.5rem;
      }
      .tech-quick-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .tech-motto-content {
        gap: 0.8rem;
      }
      .tech-motto-char {
        font-size: 2rem;
      }
      .tech-motto-dot {
        font-size: 1.5rem;
        margin-top: -0.8rem;
      }
      .tech-hero-title {
        font-size: 1.8rem;
      }
    }

    /* 加载动画 */
    .tech-loading {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      background: white;
      z-index: 9999;
      display: flex;
      align-items: center;
      justify-content: center;
      transition: opacity 0.5s ease, visibility 0.5s ease;
    }
    .tech-loading.hidden {
      opacity: 0;
      visibility: hidden;
    }
    .tech-loading-spinner {
      width: 70px;
      height: 70px;
      border: 4px solid #f0f0f0;
      border-top-color: var(--tech-blue);
      border-right-color: var(--tech-cyan);
      border-radius: 50%;
      animation: spin 1s linear infinite;
    }
    @keyframes spin {
      to { transform: rotate(360deg); }
    }