:root{
    --bg: #f5f7fb;
    --ink: #0b1020;
    --muted: #6b7280;
    --brand1: #4facfe;
    --brand2: #00f2fe;
    --accent: #8a5bfd;
    --divider: #e5e7eb;
  }

  /* 基础重置和无障碍设置 */
  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* 减少动画偏好支持 */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* 基础样式 */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #0a0a0a 0%, #1a1a2e 100%);
    color: #ffffff;
    line-height: 1.6;
    font-size: 16px;
    min-height: 100vh;
}

/* 跳转链接（屏幕阅读器） */
.skip-link {
    position: absolute;
    top: -40px;
    left: 6px;
    background: #16213e;
    color: #ffffff;
    padding: 8px;
    text-decoration: none;
    border-radius: 4px;
    z-index: 1000;
}

.skip-link:focus {
    top: 6px;
}

/* 头部导航 */
header {
    background: rgba(22, 33, 62, 0.95);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 2rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: bold;
    color: #ffffff;
}

.logo-icon {
    width: 30px;
    height: 30px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    color: #ffffff;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: background-color 0.3s ease;
}

.nav-links a:hover,
.nav-links a:focus {
    background-color: rgba(255, 255, 255, 0.1);
    outline: 2px solid #ffffff;
    outline-offset: 2px;
}


.floating-elements {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
}

.floating-card {
    position: absolute;
    background: rgba(22, 33, 62, 0.9);
    padding: 1rem;
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    animation: float 6s ease-in-out infinite;
}

.floating-card-1 {
    top: 10%;
    right: -10%;
    animation-delay: 0s;
}

.floating-card-2 {
    bottom: 20%;
    left: -15%;
    animation-delay: 2s;
}

.floating-card-3 {
    top: 60%;
    right: -5%;
    animation-delay: 4s;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

.cta-button {
    display: inline-block;
    background: linear-gradient(45deg, #16213e, #1a1a2e);
    color: #ffffff;
    padding: 1rem 2rem;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
    font-size: 1.1rem;
    border: 2px solid transparent;
    transition: all 0.3s ease;
    cursor: pointer;
}

.cta-button:hover,
.cta-button:focus {
    background: linear-gradient(45deg, #1a1a2e, #16213e);
    border-color: #ffffff;
    outline: 3px solid #ffffff;
    outline-offset: 2px;
    transform: translateY(-2px);
}

/* 主要内容区域 */
main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 4rem 2rem;
}

.section {
    margin-bottom: 6rem;
    padding: 3rem;
    background: rgba(26, 26, 46, 0.6);
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
}

.section h2 {
    font-size: 2.5rem;
    margin-bottom: 2rem;
    color: #ffffff;
    text-align: center;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 3rem;
    margin-top: 3rem;
}

.feature-card {
    background: rgba(22, 33, 62, 0.8);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    overflow: hidden;
}

.feature-card:hover,
.feature-card:focus-within {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(22, 33, 62, 0.5);
}

.feature-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.feature-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(45deg, #16213e, #1a1a2e);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    flex-shrink: 0;
}

.feature-card h3 {
    font-size: 1.5rem;
    color: #ffffff;
    margin: 0;
}

.feature-image {
    width: 100%;
    object-fit: cover;
    border-radius: 8px;
    margin-bottom: 1.5rem;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.feature-description,
.feature-usage,
.feature-feedback {
    margin-bottom: 1.5rem;
}

.feature-description h4,
.feature-usage h4,
.feature-feedback h4 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: #a8a8a8;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.section-icon {
    font-size: 1rem;
}

.usage-steps {
    display: grid;
    gap: 0.5rem;
    margin-top: 1rem;
}

.usage-step {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    padding: 0.5rem;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 6px;
}

.step-number {
    background: #16213e;
    color: #ffffff;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    font-weight: bold;
    flex-shrink: 0;
    margin-top: 0.1rem;
}

.testimonial {
    background: rgba(255, 255, 255, 0.05);
    padding: 1.5rem;
    border-radius: 8px;
    border-left: 4px solid #16213e;
    font-style: italic;
    margin-top: 1rem;
    position: relative;
}

.testimonial::before {
    content: '"';
    font-size: 3rem;
    color: rgba(255, 255, 255, 0.2);
    position: absolute;
    top: -10px;
    left: 10px;
    font-family: serif;
}

.testimonial-author {
    margin-top: 1rem;
    font-size: 0.9rem;
    color: #a8a8a8;
    font-style: normal;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.author-avatar {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    background: linear-gradient(45deg, #16213e, #1a1a2e);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
}

/* 统计数据展示 */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin: 3rem 0;
}

.stat-card {
    text-align: center;
    padding: 2rem;
    background: rgba(22, 33, 62, 0.6);
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.stat-number {
    font-size: 3rem;
    font-weight: bold;
    color: #ffffff;
    margin-bottom: 0.5rem;
    background: linear-gradient(45deg, #ffffff, #a8a8a8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    color: rgba(255, 255, 255, 0.8);
    font-size: 1rem;
}

/* 实时通知区域 */
.live-region {
    position: absolute;
    left: -10000px;
    width: 1px;
    height: 1px;
    overflow: hidden;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-links {
        flex-direction: column;
        gap: 1rem;
    }

    .section {
        padding: 2rem 1rem;
        margin-bottom: 3rem;
    }

    .feature-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }

    .floating-card {
        display: none;
    }
}

/* 焦点管理 */
*:focus {
    outline: 3px solid #ffffff;
    outline-offset: 2px;
}

/* 高对比度模式支持 */
@media (prefers-contrast: high) {
    body {
        background: #000000;
        color: #ffffff;
    }
    
    .section {
        background: #111111;
        border: 2px solid #ffffff;
    }
}

/* 图片无障碍样式 */
img {
    max-width: 100%;
    height: auto;
}

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

  .hero{
    position:relative;
    overflow:hidden;
    padding:72px 20px 32px;
    background: url('./../images/banner-2.png') no-repeat center center;
    background-size: cover;
  }
  /* 背景淡化的 UI 卡片感 */
  /* .hero::before,
  .hero::after{
    content:"";
    position:absolute;
    inset:auto;
    pointer-events:none;
    filter: blur(22px);
    opacity:.55;
  }
  .hero::before{
    top:-60px; right:-120px; width:560px; height:360px;
    background: linear-gradient(135deg, #eef2ff 0%, #ffffff 40%, #f5f7ff 100%);
    border-radius:28px;
    transform: rotate(-8deg);
  }
  .hero::after{
    bottom:-120px; left:-80px; width:420px; height:260px;
    background: linear-gradient(135deg, #f8fafc 0%, #eef2ff 50%, #ffffff 100%);
    border-radius:24px;
    transform: rotate(6deg);
  } */

  .container{max-width:1152px; margin:0 auto}

  .title{
    display:flex; align-items:baseline; justify-content:center; flex-wrap:wrap;
    gap:12px;
    font-weight:800;
    letter-spacing:.5px;
    color: #e0f2ff; /* 浅蓝色 */
    text-shadow: 0 0 8px rgba(224, 242, 255, 0.4);
  }
  .title .text{
    font-size:56px; line-height:1.05;
    color: #ffffff; /* 纯白色 */
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.3); /* 白色发光效果 */
  }
  .title .ai{
    position:relative;
    font-size:64px; line-height:1;
    background: linear-gradient(90deg, var(--brand1), var(--brand2) 50%, var(--accent) 100%);
    -webkit-background-clip:text; background-clip:text; color:transparent;
    display:inline-flex; align-items:center; gap:10px;
    color: #4facfe; /* 亮蓝色 */
    text-shadow: 0 0 15px rgba(79, 172, 254, 0.5); /* 蓝色发光效果 */
  }
  /* 星星装饰 */
  .title .ai::after{
    content:"✦";
    font-size:22px;
    transform: translateY(-10px) rotate(-10deg);
    color:#7cf3e6;
    text-shadow: 0 0 10px rgba(124,243,230,.6);
  }

  .subtitle{
    margin-top:20px;
    text-align:center;
    font-size:28px;
    font-weight:700;
    letter-spacing:.4px;
  }

  .stats{
    margin:56px auto 24px;
    padding:0 12px;
    display:grid;
    grid-template-columns: repeat(3, 1fr);
    gap:24px;
  }
  .stat{
    background: #EAEEFE;
    backdrop-filter: blur(6px);
    border:1px solid var(--divider);
    border-radius:16px;
    padding:26px 24px;
    text-align:center;
    position:relative;
  }
  .stat:not(:last-child)::after{
    content:"";
    position:absolute;
    top:18%; right:-12px; width:1px; height:64%;
    background: linear-gradient(to bottom, transparent, var(--divider), transparent);
  }
  .stat .num{
    font-size:40px; font-weight:800; letter-spacing:1px; color:var(--accent);
  }
  .stat .num .plus{font-weight:800; color:var(--accent)}
  .stat .label{
    margin-top:6px; font-size:16px; color:var(--ink);
  }
  .stat .desc{
    margin-top:12px; color:var(--muted); font-size:14px; line-height:1.6;
  }

  /* 响应式 */
  @media (max-width: 960px){
    .title .text{font-size:44px}
    .title .ai{font-size:52px}
    .subtitle{font-size:22px}
    .stat .num{font-size:34px}
  }
  @media (max-width: 720px){
    .stats{grid-template-columns:1fr; gap:14px}
    .stat:not(:last-child)::after{display:none}
    .title{gap:8px}
    .title .text{font-size:36px}
    .title .ai{font-size:44px}
    .subtitle{font-size:20px}
  }