/* ===== 设计系统 ===== */
:root {
  --primary: #6C5CE7;
  --primary-dark: #5A4BD1;
  --primary-light: #A29BFE;
  --primary-bg: rgba(108,92,231,0.06);
  --accent: #00B4D8;
  --accent-light: rgba(0,180,216,0.08);
  --success: #00B894;
  --bg: #FFFFFF;
  --bg-soft: #F8F9FE;
  --bg-card: #FFFFFF;
  --text: #1A1A2E;
  --text-secondary: #6B7280;
  --text-light: #9CA3AF;
  --border: #E5E7EB;
  --border-light: #F3F4F6;
  --shadow-sm: 0 2px 8px rgba(108,92,231,0.06);
  --shadow: 0 4px 24px rgba(108,92,231,0.08);
  --shadow-lg: 0 12px 40px rgba(108,92,231,0.12);
  --radius: 16px;
  --radius-sm: 10px;
  --radius-xs: 6px;
  --transition: 0.3s cubic-bezier(0.4,0,0.2,1);
  --max-w: 1140px;
  --font: 'Inter','Noto Sans SC',system-ui,-apple-system,sans-serif;
}

/* ===== 重置 ===== */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:var(--font);color:var(--text);background:var(--bg);line-height:1.7;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
ul{list-style:none}
img{max-width:100%;display:block}
button{font-family:var(--font)}

/* ===== 容器 ===== */
.container{max-width:var(--max-w);margin:0 auto;padding:0 24px}

/* ===== 导航栏 ===== */
.navbar{position:fixed;top:0;left:0;right:0;z-index:1000;background:rgba(255,255,255,0.88);backdrop-filter:blur(18px);border-bottom:1px solid var(--border);transition:var(--transition)}
.navbar .container{display:flex;align-items:center;justify-content:space-between;height:64px}
.nav-brand{font-size:1.15rem;font-weight:700;background:linear-gradient(135deg,var(--primary),var(--accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;white-space:nowrap}
.nav-links{display:flex;gap:20px;align-items:center;flex-wrap:nowrap}
.nav-links a{font-size:0.82rem;color:var(--text-secondary);font-weight:500;transition:var(--transition);position:relative;white-space:nowrap}
.nav-links a::after{content:'';position:absolute;bottom:-3px;left:0;width:0;height:2px;background:var(--primary);border-radius:2px;transition:var(--transition)}
.nav-links a:hover{color:var(--primary)}
.nav-links a:hover::after{width:100%}
.nav-toggle{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:4px;background:none;border:none}
.nav-toggle span{width:22px;height:2px;background:var(--text);border-radius:2px;transition:var(--transition)}

/* ===== 首屏 ===== */
.hero{padding:140px 0 90px;background:linear-gradient(170deg,#F8F9FE 0%,#EDE9FE 40%,#E0F2FE 100%);position:relative;overflow:hidden}
.hero::before{content:'';position:absolute;top:-120px;right:-120px;width:400px;height:400px;border-radius:50%;background:radial-gradient(circle,rgba(108,92,231,0.1),transparent 70%)}
.hero::after{content:'';position:absolute;bottom:-80px;left:-80px;width:300px;height:300px;border-radius:50%;background:radial-gradient(circle,rgba(0,180,216,0.08),transparent 70%)}
.hero .container{position:relative;z-index:1;text-align:center}
.hero h1{font-size:2.8rem;font-weight:800;margin-bottom:18px;background:linear-gradient(135deg,var(--primary),var(--primary-dark));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero .hero-subtitle{font-size:1.12rem;color:var(--text-secondary);max-width:620px;margin:0 auto 20px;line-height:1.8}
.hero .hero-desc{font-size:0.92rem;color:var(--text-light);max-width:680px;margin:0 auto 36px;line-height:1.8;border-left:3px solid var(--primary-light);padding-left:16px;text-align:left}
.hero-btns{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}

/* ===== 按钮 ===== */
.btn{display:inline-flex;align-items:center;gap:8px;padding:13px 30px;border-radius:50px;font-size:0.92rem;font-weight:600;cursor:pointer;border:none;transition:var(--transition);text-align:center;justify-content:center}
.btn-primary{background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:#fff;box-shadow:0 4px 20px rgba(108,92,231,0.3)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 28px rgba(108,92,231,0.4)}
.btn-outline{background:transparent;color:var(--primary);border:2px solid var(--primary-light)}
.btn-outline:hover{background:var(--primary);color:#fff;border-color:var(--primary)}
.btn-sm{padding:10px 22px;font-size:0.85rem}
.btn-ghost{background:var(--primary-bg);color:var(--primary);border:none}
.btn-ghost:hover{background:var(--primary);color:#fff}

/* ===== 通用板块 ===== */
.section{padding:90px 0}
.section-alt{background:var(--bg-soft)}
.section-header{text-align:center;margin-bottom:56px}
.section-header h2{font-size:1.9rem;font-weight:700;margin-bottom:10px;color:var(--text)}
.section-header p{color:var(--text-secondary);font-size:1rem;max-width:520px;margin:0 auto}
.section-header .accent-line{width:44px;height:3px;border-radius:3px;margin:14px auto 0;background:linear-gradient(90deg,var(--primary),var(--accent))}

/* ===== 服务卡片 ===== */
.services-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.service-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:32px 26px;transition:var(--transition);position:relative;overflow:hidden;display:flex;flex-direction:column}
.service-card::before{content:'';position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--primary),var(--accent));transform:scaleX(0);transition:var(--transition);transform-origin:left}
.service-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}
.service-card:hover::before{transform:scaleX(1)}
.service-icon{width:52px;height:52px;border-radius:13px;margin-bottom:18px;background:linear-gradient(135deg,var(--primary-bg),var(--accent-light));display:flex;align-items:center;justify-content:center;color:var(--primary)}
.service-card h3{font-size:1.1rem;font-weight:700;margin-bottom:10px}
.service-card .service-desc{font-size:0.9rem;color:var(--text-secondary);line-height:1.7;margin-bottom:14px}
.service-meta{font-size:0.82rem;color:var(--text-light);margin-bottom:6px;display:flex;align-items:flex-start;gap:6px;line-height:1.6}
.service-meta strong{color:var(--text-secondary);white-space:nowrap;min-width:60px}
.service-bottom{margin-top:auto;padding-top:18px;border-top:1px solid var(--border-light);display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:10px}
.service-price{font-size:1.1rem;font-weight:700;background:linear-gradient(135deg,var(--primary),var(--accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.service-note{font-size:0.78rem;color:var(--text-light);margin-top:4px;width:100%;line-height:1.5}

/* ===== 流程步骤 ===== */
.steps-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:16px;position:relative}
.steps-grid::before{content:'';position:absolute;top:30px;left:60px;right:60px;height:2px;background:var(--border);z-index:0}
.step-card{text-align:center;position:relative;z-index:1;padding:0 8px}
.step-num{width:52px;height:52px;border-radius:50%;margin:0 auto 16px;background:linear-gradient(135deg,var(--primary),var(--accent));color:#fff;font-size:1.15rem;font-weight:700;display:flex;align-items:center;justify-content:center;box-shadow:0 4px 16px rgba(108,92,231,0.25)}
.step-card h3{font-size:0.95rem;font-weight:700;margin-bottom:6px}
.step-card p{font-size:0.82rem;color:var(--text-secondary);line-height:1.6}
.order-note{max-width:700px;margin:40px auto 0;text-align:center;padding:20px 28px;border-radius:var(--radius-sm);background:var(--primary-bg);border:1px solid rgba(108,92,231,0.1)}
.order-note p{font-size:0.88rem;color:var(--text-secondary);line-height:1.7;margin-bottom:6px}
.order-note p:last-child{margin-bottom:0}

/* ===== 付款方式 ===== */
.payment-block{max-width:720px;margin:0 auto}
.payment-desc{font-size:0.95rem;color:var(--text-secondary);line-height:1.9;text-align:center;margin-bottom:36px}
.payment-info{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;margin-bottom:32px}
.payment-item{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-sm);padding:20px;display:flex;align-items:center;gap:14px}
.payment-item .pi-icon{width:40px;height:40px;border-radius:10px;flex-shrink:0;background:linear-gradient(135deg,var(--primary-bg),var(--accent-light));display:flex;align-items:center;justify-content:center;color:var(--primary)}
.payment-item h4{font-size:0.8rem;color:var(--text-light);margin-bottom:2px}
.payment-item p{font-size:0.9rem;font-weight:600;color:var(--text)}
.payment-cta{text-align:center}

/* ===== 项目案例 ===== */
.cases-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:18px}
.case-card{display:flex;gap:14px;align-items:flex-start;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-sm);padding:22px 18px;transition:var(--transition)}
.case-card:hover{box-shadow:var(--shadow);transform:translateY(-2px)}
.case-icon{width:42px;height:42px;border-radius:11px;flex-shrink:0;background:linear-gradient(135deg,var(--primary-bg),var(--accent-light));display:flex;align-items:center;justify-content:center;color:var(--primary)}
.case-info h3{font-size:0.95rem;font-weight:700;margin-bottom:4px}
.case-tag{display:inline-block;font-size:0.7rem;font-weight:600;color:var(--primary);background:var(--primary-bg);padding:2px 10px;border-radius:20px;margin-bottom:8px}
.case-info p{font-size:0.85rem;color:var(--text-secondary);line-height:1.6;margin:0}

/* ===== 关于我们 ===== */
.about-content{max-width:720px;margin:0 auto;text-align:center;font-size:1rem;color:var(--text-secondary);line-height:2;margin-bottom:40px}
.about-details{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px;max-width:720px;margin:0 auto}
.about-item{display:flex;align-items:center;gap:12px;padding:14px 18px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-sm)}
.about-item .ai-icon{width:36px;height:36px;border-radius:9px;flex-shrink:0;background:linear-gradient(135deg,var(--primary-bg),var(--accent-light));display:flex;align-items:center;justify-content:center;color:var(--primary)}
.about-item h4{font-size:0.78rem;color:var(--text-light);margin-bottom:1px}
.about-item p{font-size:0.88rem;font-weight:500}
.about-item a{color:var(--primary)}

/* ===== FAQ ===== */
.faq-list{max-width:720px;margin:0 auto}
.faq-item{border:1px solid var(--border);border-radius:var(--radius-sm);margin-bottom:10px;overflow:hidden;transition:var(--transition)}
.faq-item:hover{border-color:var(--primary-light)}
.faq-question{width:100%;display:flex;align-items:center;justify-content:space-between;padding:18px 22px;background:none;border:none;cursor:pointer;font-size:0.95rem;font-weight:600;color:var(--text);font-family:var(--font);text-align:left;gap:12px}
.faq-question svg{flex-shrink:0;color:var(--text-light);transition:var(--transition)}
.faq-item.active .faq-question svg{transform:rotate(180deg);color:var(--primary)}
.faq-item.active .faq-question{color:var(--primary)}
.faq-answer{max-height:0;overflow:hidden;transition:max-height 0.35s ease,padding 0.35s ease;padding:0 22px}
.faq-item.active .faq-answer{max-height:300px;padding:0 22px 18px}
.faq-answer p{font-size:0.9rem;color:var(--text-secondary);line-height:1.8}

/* ===== 联系我们 ===== */
.contact-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:18px;max-width:820px;margin:0 auto 32px}
.contact-item{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-sm);padding:22px 20px;display:flex;align-items:flex-start;gap:14px;transition:var(--transition)}
.contact-item:hover{box-shadow:var(--shadow-sm)}
.contact-icon{width:40px;height:40px;border-radius:10px;flex-shrink:0;background:linear-gradient(135deg,var(--primary-bg),var(--accent-light));display:flex;align-items:center;justify-content:center;color:var(--primary)}
.contact-item h4{font-size:0.8rem;color:var(--text-light);margin-bottom:2px}
.contact-item p{font-size:0.9rem;font-weight:500}
.contact-item a{color:var(--primary)}
.contact-cta{text-align:center}

/* ===== 页脚 ===== */
.footer{padding:36px 0;border-top:1px solid var(--border);background:var(--bg-soft)}
.footer-inner{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:flex-start;gap:24px}
.footer-brand{font-size:1rem;font-weight:700;background:linear-gradient(135deg,var(--primary),var(--accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:6px}
.footer-left p{font-size:0.82rem;color:var(--text-light);line-height:1.7}
.footer-right{display:flex;gap:24px;flex-wrap:wrap}
.footer-right a{font-size:0.82rem;color:var(--text-light);transition:var(--transition)}
.footer-right a:hover{color:var(--primary)}
.footer-copy{text-align:center;margin-top:24px;padding-top:20px;border-top:1px solid var(--border);font-size:0.8rem;color:var(--text-light)}

/* ===== 策略页面 ===== */
.policy-page{padding:110px 0 70px}
.policy-page .container{max-width:760px}
.policy-page h1{font-size:1.9rem;font-weight:700;margin-bottom:10px;background:linear-gradient(135deg,var(--primary),var(--primary-dark));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.policy-page .update-date{color:var(--text-light);font-size:0.88rem;margin-bottom:36px}
.policy-page h2{font-size:1.2rem;font-weight:700;margin:28px 0 10px;color:var(--text)}
.policy-page p,.policy-page li{font-size:0.92rem;color:var(--text-secondary);line-height:1.9}
.policy-page ul{padding-left:20px;margin:8px 0 14px}
.policy-page li{list-style:disc;margin-bottom:5px}
.policy-page .back-link{display:inline-flex;align-items:center;gap:6px;color:var(--primary);font-weight:600;margin-top:36px;font-size:0.92rem}
.policy-page .back-link:hover{text-decoration:underline}

/* ===== 响应式 ===== */
@media(max-width:1024px){
  .nav-links{gap:14px}
  .nav-links a{font-size:0.78rem}
  .steps-grid{grid-template-columns:repeat(3,1fr)}
  .steps-grid::before{display:none}
}
@media(max-width:768px){
  .nav-links{display:none;position:fixed;top:64px;left:0;right:0;bottom:0;background:rgba(255,255,255,0.98);backdrop-filter:blur(20px);flex-direction:column;padding:32px 28px;gap:20px;overflow-y:auto}
  .nav-links.active{display:flex}
  .nav-toggle{display:flex}
  .hero{padding:120px 0 60px}
  .hero h1{font-size:2rem}
  .hero .hero-subtitle{font-size:1rem}
  .services-grid{grid-template-columns:1fr}
  .steps-grid{grid-template-columns:1fr;gap:20px}
  .steps-grid::before{display:none}
  .payment-info{grid-template-columns:1fr}
  .cases-grid{grid-template-columns:1fr}
  .about-details{grid-template-columns:1fr}
  .contact-grid{grid-template-columns:1fr}
  .section{padding:64px 0}
  .footer-inner{flex-direction:column;align-items:center;text-align:center}
  .footer-right{justify-content:center}
}
@media(max-width:480px){
  .hero h1{font-size:1.7rem}
  .btn{padding:11px 22px;font-size:0.85rem}
  .section-header h2{font-size:1.5rem}
}