:root {
    --tech-blue: #1e40af;       /* AI科技蓝 */
    --tech-dark: #0f172a;       /* 实验室冷黑 */
    --neon-green: #10b981;      /* 智能高亮荧光绿 */
    --accent-orange: #d97706;   /* 橙黄前瞻色 - 略微加深提高白色背景上的对比度 */
    --tech-bg: #f8fafc;         /* 干净的微灰蓝底 */
}

body {
    font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, Roboto, sans-serif;
    background-color: var(--tech-bg);
    color: #1e293b;             /* 加深正文字体颜色，确保与白底形成极高对比度 */
    line-height: 1.7;
}

/* 顶部导航 */
.navbar {
    background: linear-gradient(135deg, var(--tech-dark), #1e293b) !important;
    border-bottom: 2px solid #3b82f6;
    padding: 12px 0;
}

.navbar-brand {
    font-weight: 800;
    font-size: 1.3rem;
    color: #ffffff !important;
    letter-spacing: 0.05em;
}

/* 主视觉：冷夜极客未来感 */
.hero-section {
    background: radial-gradient(circle at top right, rgba(30, 64, 175, 0.2), transparent), 
                linear-gradient(135deg, #0b1329 0%, #111b36 100%);
    color: white;
    padding: 90px 0;
    text-align: center;
    border-bottom: 4px solid var(--tech-blue);
}

.hero-section h1 {
    font-size: 3rem;
    font-weight: 800;
    letter-spacing: -0.01em;
    background: linear-gradient(to right, #ffffff, #93c5fd);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-section p {
    color: #e2e8f0; /* 调亮 Hero 描述文本，确保黑底上的高辨识度 */
}

.section-title {
    position: relative;
    padding-bottom: 15px;
    margin-bottom: 35px;
    color: var(--tech-blue);
    font-weight: 800;
    font-size: 1.8rem;
    text-align: center;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: var(--neon-green);
    border-radius: 2px;
}

/* 科技风智能数据卡片 */
.card {
    border: none;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(15, 23, 42, 0.04);
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    margin-bottom: 25px;
    overflow: hidden;
    background-color: #ffffff;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(30, 64, 175, 0.08);
}

.card-header {
    background: linear-gradient(to right, var(--tech-blue), #2563eb);
    color: white;
    font-weight: 700;
    padding: 16px 22px;
    border: none;
}

/* 数据预测大表优化 */
.price-table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
}

.price-table th {
    background-color: var(--tech-blue);
    color: white;
    padding: 14px 16px;
    font-weight: 700;
    font-size: 0.95rem;
}

.price-table td {
    padding: 14px 16px;
    border-bottom: 1px solid #cbd5e1;
    color: #0f172a; /* 替换为极深的颜色，确保在极浅蓝背景上字迹清晰 */
    font-size: 0.9rem;
}

.price-table tr:nth-child(even) {
    background-color: #f1f5f9;
}

.price-table tr:hover {
    background-color: #e2e8f0;
}

/* 步骤流：科技数码标 */
.process-step {
    position: relative;
    padding-left: 45px;
    margin-bottom: 30px;
}

.process-step h4 {
    font-weight: 700;
    color: #0f172a;
}

.process-step p {
    color: #334155; /* 加深说明文本 */
}

.process-step::before {
    content: '';
    position: absolute;
    left: 0;
    top: 3px;
    width: 28px;
    height: 28px;
    background: linear-gradient(135deg, var(--tech-blue), var(--neon-green));
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 800;
    font-size: 13px;
    box-shadow: 0 4px 10px rgba(30, 64, 175, 0.2);
}

.process-step:nth-child(1)::before { content: '01'; }
.process-step:nth-child(2)::before { content: '02'; }
.process-step:nth-child(3)::before { content: '03'; }
.process-step:nth-child(4)::before { content: '04'; }

/* 精美无感 FAQ 卡片 */
.faq-item {
    margin-bottom: 15px;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0,0,0,0.02);
    border: 1px solid #cbd5e1;
}

.faq-question {
    background-color: #ffffff;
    padding: 18px 24px;
    font-weight: 700;
    color: #1e3a8a; /* 极深科技蓝，强化标题辨识度 */
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-answer {
    padding: 22px 24px;
    background-color: #f8fafc;
    border-top: 1px solid #cbd5e1;
    color: #0f172a; /* 强化回答文本对比度 */
}

/* 专业数据提示框 */
.disclaimer {
    background-color: #f0fdf4;
    border-left: 4px solid var(--neon-green);
    padding: 22px;
    margin: 35px 0;
    border-radius: 0 10px 10px 0;
}

.disclaimer p {
    color: #064e3b; /* 森林深绿，确保在浅绿背景上对比度完美 */
}

/* 🛠️ 页脚核心重塑（彻底修复颜色对比度漏洞） */
.footer {
    background: #090d16; /* 极暗科技底色 */
    color: #e2e8f0;      /* 将原先模糊的暗灰调高至【亮灰白】，彻底通过 WCAG 4.5:1 对比度审计 */
    padding: 55px 0 35px;
    margin-top: 70px;
    border-top: 4px solid var(--tech-blue);
}

.footer h4 {
    color: #ffffff;      /* 纯白主标题 */
    font-weight: 700;
    margin-bottom: 20px;
}

.footer h5 {
    color: #ffffff;      /* 纯白子标题 */
    font-weight: 700;
}

.footer p {
    color: #cbd5e1;      /* 精细调亮普通正文 */
}

.footer .text-muted {
    color: #94a3b8 !important; /* 辅助微调文字同样保持安全对比 */
}

.footer a {
    color: #cbd5e1;      /* 页脚链接文字调亮 */
    text-decoration: underline; /* 增加下划线辅助视障和SEO抓取 */
    text-underline-offset: 4px;
    transition: color 0.2s ease;
}

.footer a:hover {
    color: var(--neon-green);
}

/* 页脚超链接在科技蓝/荧光绿主题下的悬浮效果微调 */
.footer a {
    transition: color 0.2s ease, opacity 0.2s ease;
}

.footer a:hover {
    color: var(--neon-green) !important; /* 悬浮时完美切换为荧光绿[cite: 8] */
}

/* 自动化抓取专用域名样式保护 */
#seo-footer-domain {
    color: #ffc107 !important; /* 维持耀眼的金黄色增强视觉重心 */
}

#seo-footer-domain:hover {
    opacity: 0.85;
}