/* ============ 全局重置 ============ */
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI','PingFang SC','Microsoft YaHei',sans-serif;background:var(--bg-primary,#f5f7fa);color:var(--text-primary,#333);line-height:1.6;-webkit-font-smoothing:antialiased}
a{color:var(--color-accent,#4361ee);text-decoration:none}
img{max-width:100%}

/* ============ 应用容器 ============ */
.app-container{min-height:100vh;display:flex;flex-direction:column}

/* ============ 顶部导航 ============ */
.app-header{background:var(--gradient-hero,linear-gradient(135deg,#4361ee,#3a56d4));color:#fff;position:sticky;top:0;z-index:100;box-shadow:0 2px 8px rgba(67,97,238,.15)}
.header-inner{max-width:1100px;margin:0 auto;padding:0 20px;height:52px;display:flex;align-items:center;justify-content:space-between}
.logo{font-size:18px;font-weight:700;color:#fff;text-decoration:none;letter-spacing:.5px}
.nav-links{display:flex;gap:20px}
.nav-links a{color:rgba(255,255,255,.85);font-size:14px;text-decoration:none;transition:color .2s;padding:4px 0;border-bottom:2px solid transparent}
.nav-links a:hover{color:#fff;border-bottom-color:#fff}
.nav-login-btn{background:rgba(255,255,255,.2);color:#fff !important;padding:6px 16px !important;border-radius:20px;font-weight:600}
.nav-user{color:rgba(255,255,255,.9) !important;font-size:13px !important}

/* ============ 主体 ============ */
.app-main{flex:1}

/* ============ 底部 ============ */
.app-footer{background:var(--bg-footer,#1a1a2e);color:rgba(255,255,255,.7);text-align:center;padding:32px 20px 20px;font-size:12px}
.footer-inner{max-width:600px;margin:0 auto}
.footer-links{display:flex;justify-content:center;gap:20px;margin-bottom:12px;flex-wrap:wrap}
.footer-links a{color:rgba(255,255,255,.6);text-decoration:none;font-size:13px;transition:color .2s}
.footer-links a:hover{color:#fff}
.footer-copy{margin-bottom:4px}
.footer-icp{font-size:11px;opacity:.5}

/* ============ 首页Banner ============ */
.home-banner{background:linear-gradient(135deg,#4361ee,#7209b7);color:#fff;padding:60px 20px;text-align:center}
.banner-content{max-width:600px;margin:0 auto}
.banner-content h1{font-size:32px;font-weight:800;margin-bottom:12px}
.banner-content p{font-size:16px;opacity:.9;margin-bottom:28px}
.banner-actions{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}

/* ============ 通用区块 ============ */
.section{padding:50px 20px;max-width:1100px;margin:0 auto}
.section-title{text-align:center;font-size:24px;font-weight:700;color:#1a1a2e;margin-bottom:32px}

/* ============ 功能卡片 ============ */
.features-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:20px}
.feature-card{background:#fff;border-radius:14px;padding:28px 20px;text-align:center;box-shadow:0 2px 12px rgba(0,0,0,.04);transition:transform .2s,box-shadow .2s}
.feature-card:hover{transform:translateY(-3px);box-shadow:0 6px 20px rgba(0,0,0,.08)}
.feature-icon{font-size:40px;margin-bottom:12px}
.feature-card h3{font-size:17px;font-weight:600;margin-bottom:8px;color:#1a1a2e}
.feature-card p{font-size:13px;color:#666;line-height:1.6}

/* ============ 套餐卡片 ============ */
.packages-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:16px}
.package-card{background:var(--bg-card,#fff);border-radius:var(--radius-lg,14px);padding:24px 16px;text-align:center;box-shadow:var(--shadow-md,0 2px 10px rgba(0,0,0,.04));border:2px solid transparent;transition:all .2s}
.package-card:hover{border-color:var(--color-accent,#4361ee);transform:translateY(-2px)}
.package-num{font-size:30px;font-weight:800;color:var(--color-accent,#4361ee)}
.package-price{font-size:22px;font-weight:700;color:var(--color-danger,#e74c3c);margin:8px 0 4px}
.package-per{font-size:12px;color:var(--text-muted,#999);margin-bottom:14px}

/* ============ 流程步骤 ============ */
.steps-horizontal{display:flex;align-items:flex-start;justify-content:center;gap:8px;flex-wrap:wrap}
.flow-step{background:var(--bg-card,#fff);border-radius:var(--radius-lg,14px);padding:24px 16px;text-align:center;box-shadow:var(--shadow-md,0 2px 10px rgba(0,0,0,.04));flex:1;min-width:140px;max-width:200px}
.flow-num{width:40px;height:40px;border-radius:50%;background:var(--color-accent,#4361ee);color:#fff;font-size:18px;font-weight:700;line-height:40px;margin:0 auto 12px}
.flow-step h4{font-size:15px;font-weight:600;margin-bottom:4px;color:var(--text-primary)}
.flow-step p{font-size:12px;color:var(--text-secondary,#666)}
.flow-arrow{font-size:24px;color:var(--border-light,#ccc);padding-top:30px}

/* ============ 按钮 ============ */
.btn{display:inline-block;padding:10px 24px;border:none;border-radius:var(--radius-md,10px);font-size:14px;font-weight:600;cursor:pointer;text-decoration:none;transition:all .15s}
.btn-primary{background:var(--color-accent,#4361ee);color:#fff}
.btn-primary:hover{background:var(--color-accent-hover,#3a56d4)}
.btn-outline{background:var(--bg-card,#fff);color:var(--color-accent,#4361ee);border:2px solid var(--color-accent,#4361ee)}
.btn-outline:hover{background:var(--bg-primary,#f0f3ff)}
.btn-success{background:var(--color-success,#06d6a0);color:#fff}
.btn-danger{background:var(--color-danger,#ef476f);color:#fff}
.btn-warning{background:var(--color-warning,#f7931e);color:#fff}
.btn-sm{padding:6px 16px;font-size:12px;border-radius:8px}
.btn-lg{padding:14px 36px;font-size:16px;border-radius:12px}
.btn-block{display:block;width:100%}
.btn:disabled,.btn[disabled]{opacity:.6;cursor:not-allowed}

/* ============ 加载 ============ */
.loading{position:fixed;top:0;left:0;right:0;bottom:0;background:rgba(255,255,255,.7);z-index:9999;display:flex;align-items:center;justify-content:center}
.loading-spinner{width:40px;height:40px;border:3px solid #e0e0e0;border-top-color:var(--color-accent,#4361ee);border-radius:50%;animation:spin .8s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}

/* ============ Toast ============ */
.toast{position:fixed;top:20px;left:50%;transform:translateX(-50%);background:var(--text-primary,#333);color:var(--text-inverse,#fff);padding:10px 24px;border-radius:10px;font-size:14px;z-index:10000;opacity:0;transition:opacity .3s}
.toast.show{opacity:1}

/* ============ 模态框 ============ */
.pay-modal{display:none;position:fixed;top:0;left:0;right:0;bottom:0;background:rgba(0,0,0,.5);z-index:1000;align-items:center;justify-content:center}
.pay-modal.show{display:flex}
.pay-dialog{background:var(--bg-card,#fff);border-radius:var(--radius-lg,16px);padding:28px 24px;width:90%;max-width:380px;box-shadow:var(--shadow-lg,0 10px 40px rgba(0,0,0,.15))}
.pay-dialog h3{text-align:center;margin-bottom:16px;font-size:18px;color:var(--text-primary)}

/* ============ 响应式 ============ */
@media (max-width:768px) {
    .home-banner{padding:40px 16px}
    .banner-content h1{font-size:24px}
    .banner-content p{font-size:14px}
    .banner-actions{flex-direction:column;align-items:center}
    .banner-actions .btn{width:80%}
    .features-grid{grid-template-columns:repeat(2,1fr);gap:12px}
    .feature-card{padding:20px 12px}
    .packages-grid{grid-template-columns:repeat(2,1fr);gap:12px}
    .steps-horizontal{flex-direction:column;align-items:center}
    .flow-arrow{transform:rotate(90deg);padding:0}
    .section{padding:32px 16px}
    .nav-links{gap:12px}
    .nav-links a{font-size:13px}
}

@media (max-width:480px) {
    .features-grid{grid-template-columns:1fr}
    .packages-grid{grid-template-columns:1fr}
}

/* ============ 底部导航栏 ============ */
.bottom-nav{position:fixed;bottom:0;left:0;right:0;height:60px;background:#fff;border-top:1px solid #f0f0f0;display:flex;align-items:center;justify-content:space-around;z-index:200;padding-bottom:env(safe-area-inset-bottom);box-shadow:0 -2px 10px rgba(0,0,0,0.03)}
.bn-item{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;text-decoration:none;color:#999;font-size:10px;flex:1;height:100%;transition:color .2s}
.bn-item svg{width:22px;height:22px;stroke-width:1.8}
.bn-item.active{color:#07c160}
.bn-item.active svg{stroke:#07c160}

/* 有底部导航时主内容区增加底部padding */
.app-main{padding-bottom:70px}

/* 桌面端隐藏底部导航 */
@media (min-width:769px) {
    .bottom-nav{display:none}
    .app-main{padding-bottom:0}
}

/* 移动端简化顶部导航 */
@media (max-width:768px) {
    .app-header .nav-links{display:none}
    .app-header .logo{font-size:16px}
    .header-inner{height:48px !important}
    .app-footer{padding-bottom:80px}
}