*{margin:0;padding:0;box-sizing:border-box}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;background:#F0F2F5;color:#1F2937;line-height:1.6;-webkit-font-smoothing:antialiased}
:root{--primary:#1D4ED8;--primary-light:#3B82F6;--primary-dark:#1E3A5F;--accent:#2563EB;--card:#FFF;--border:#E5E7EB;--text:#1F2937;--gray:#6B7280;--light:#9CA3AF;--bg:#F0F2F5}

.top-bar{background:linear-gradient(90deg,#1E3A5F,#2563EB);color:#fff;padding:0 16px;display:flex;align-items:center;justify-content:space-between;height:52px;position:sticky;top:0;z-index:100}
.top-bar .brand{display:flex;align-items:center;gap:8px;font-size:15px;font-weight:600}
.top-bar .brand i{font-size:18px;background:rgba(255,255,255,0.15);width:30px;height:30px;display:flex;align-items:center;justify-content:center;border-radius:8px}
.top-bar .phone{display:flex;align-items:center;gap:6px;font-size:14px;font-weight:600;color:#fff;text-decoration:none;background:rgba(255,255,255,0.1);padding:6px 14px;border-radius:20px}

.hero{padding:28px 16px 24px;text-align:center;background:#fff;border-bottom:1px solid var(--border)}
.hero h1{font-size:21px;font-weight:700;color:var(--primary-dark);margin-bottom:6px}
.hero .sub{font-size:14px;color:var(--gray);margin-bottom:14px}
.hero-badges{display:flex;justify-content:center;gap:10px;flex-wrap:wrap;max-width:520px;margin:0 auto}
.hero-badges span{display:flex;align-items:center;gap:4px;background:#EFF6FF;color:var(--primary);padding:4px 12px;border-radius:16px;font-size:12px;font-weight:500}

.container{max-width:800px;margin:0 auto;padding:0 16px}
.section-title{font-size:17px;font-weight:700;margin:20px 0 4px;color:var(--text)}
.section-sub{font-size:13px;color:var(--gray);margin-bottom:14px}

.isp-tabs{display:flex;gap:12px;margin-bottom:16px}
.isp-tab{flex:1;text-align:center;padding:14px 0;border-radius:12px;border:2px solid var(--border);background:#fff;font-size:14px;font-weight:600;color:var(--gray);cursor:pointer;transition:all .2s;line-height:1.3}
.isp-tab.active{border-color:var(--primary);background:#EFF6FF;color:var(--primary);box-shadow:0 2px 8px rgba(37,99,235,0.1)}

.price-table{display:none;margin-bottom:16px}
.price-table.active{display:block}
table{width:100%;border-collapse:collapse;background:#fff;border-radius:12px;overflow:hidden;box-shadow:0 1px 4px rgba(0,0,0,0.04);font-size:14px}
thead{background:#F8FAFC}
th{padding:11px 8px;font-size:13px;font-weight:600;color:var(--gray);text-align:center;border-bottom:1px solid var(--border)}
td{padding:11px 8px;text-align:center;color:var(--text);border-bottom:1px solid #F3F4F6;cursor:pointer;transition:background .15s}
td:active{background:#EFF6FF}
td .price{font-size:17px;font-weight:700;color:var(--primary);display:block}
td .label{font-size:11px;color:var(--light);margin-top:2px}
td .na{color:var(--light);font-weight:400}
.speed-label{font-weight:600;color:var(--text);background:#FAFBFC;text-align:left;padding-left:16px;font-size:14px}
tr:last-child td{border-bottom:none}
tr.selected td{background:#EFF6FF}
tr.selected td .price{color:var(--primary-dark)}
.plan-note{font-size:12px;color:var(--light);padding:10px 0;line-height:1.7}

.form-card{background:#fff;border-radius:14px;padding:22px 20px;margin-bottom:20px;box-shadow:0 1px 4px rgba(0,0,0,0.04)}
.form-group{margin-bottom:16px}
.form-group:last-child{margin-bottom:0}
.form-label{font-size:13px;font-weight:600;color:var(--text);margin-bottom:6px;display:block}
.form-label .required{color:#EF4444;margin-left:2px}
.form-input,.form-select{width:100%;padding:11px 14px;border:1.5px solid var(--border);border-radius:10px;font-size:15px;color:var(--text);background:#fff;outline:none;transition:border .2s;-webkit-appearance:none}
.form-input:focus,.form-select:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(37,99,235,0.08)}
.form-select{background-image:url("data:image/svg+xml,%3Csvg viewBox='0 0 12 8' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath fill='%236B7280' d='M1 1l5 5 5-5'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 12px center;padding-right:36px;background-size:12px}
.form-textarea{width:100%;padding:11px 14px;border:1.5px solid var(--border);border-radius:10px;font-size:15px;color:var(--text);outline:none;min-height:72px;transition:border .2s;resize:vertical}
.form-textarea:focus{border-color:var(--primary)}
.form-row{display:flex;gap:12px}
.form-row .form-group{flex:1}

/* 运营商选择卡片 */
.isp-selectors{display:flex;gap:12px}
.isp-card{flex:1;text-align:center;padding:14px 8px;border:2px solid var(--border);border-radius:12px;cursor:pointer;transition:all .2s;background:#fff}
.isp-card:active{transform:scale(0.98)}
.isp-card.active{border-color:var(--primary);background:#EFF6FF;box-shadow:0 2px 8px rgba(37,99,235,0.1)}
.isp-card .isp-logo-img{width:100%;display:flex;align-items:center;justify-content:center;margin:0 auto}
.isp-card .isp-logo-img img{height:32px;width:auto;object-fit:contain}
.isp-card .isp-name{font-weight:700;font-size:15px;color:var(--text);margin-bottom:2px}
.isp-card.active .isp-name{color:var(--primary)}
.isp-card .isp-sub{font-size:11px;color:var(--light);margin-top:0}

/* 速率单选框 */
.speed-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}
.speed-opt{text-align:center;padding:14px 8px;border:2px solid var(--border);border-radius:12px;cursor:pointer;transition:all .15s;font-weight:600;font-size:15px;color:var(--text);background:#fff}
.speed-opt:active{transform:scale(0.97)}
.speed-opt.selected{border-color:var(--primary);background:#EFF6FF;color:var(--primary)}
.speed-opt .speed-sub{font-size:11px;font-weight:400;color:var(--light);margin-top:2px;display:block}
.speed-opt.selected .speed-sub{color:rgba(37,99,235,0.6)}

/* 使用期限单选框 */
.year-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}
.year-grid .year-opt{text-align:center;padding:14px 8px;border:2px solid var(--border);border-radius:12px;cursor:pointer;transition:all .15s;font-weight:600;font-size:16px;color:var(--text);background:#fff}
.year-grid .year-opt:active{transform:scale(0.97)}
.year-grid .year-opt.selected{border-color:var(--primary);background:#EFF6FF;color:var(--primary)}

.submit-btn{width:100%;padding:14px;background:linear-gradient(90deg,#2563EB,#1D4ED8);color:#fff;border:none;border-radius:12px;font-size:16px;font-weight:600;cursor:pointer;box-shadow:0 4px 12px rgba(37,99,235,0.25);transition:opacity .2s}
.submit-btn:active{opacity:0.85}
.submit-btn:disabled{opacity:0.5;cursor:not-allowed;box-shadow:none}
.success-msg{display:none;text-align:center;padding:40px 20px}
.success-msg .icon{display:inline-flex;width:60px;height:60px;background:#D1FAE5;border-radius:50%;align-items:center;justify-content:center;font-size:28px;margin-bottom:16px;color:#059669}

/* 地区范围蓝色卡片 */
.region-card{background:linear-gradient(135deg,#EFF6FF,#DBEAFE);border:1px solid #BFDBFE;border-radius:12px;padding:14px 16px;margin-bottom:16px}
.region-card .title{display:flex;align-items:center;gap:8px;font-size:14px;font-weight:600;color:#1E40AF;margin-bottom:6px}
.region-card .cities{font-size:13px;color:#3B82F6;line-height:1.8}

/* 流程步骤 */
.steps{display:flex;gap:12px;margin-bottom:16px;overflow-x:auto;-webkit-overflow-scrolling:touch}
.step{flex-shrink:0;flex:1;background:#fff;border:1px solid var(--border);border-radius:12px;padding:14px 12px;text-align:center;min-width:120px}
.step .num{display:inline-flex;width:28px;height:28px;background:var(--primary);color:#fff;border-radius:50%;align-items:center;justify-content:center;font-size:13px;font-weight:700;margin-bottom:8px}
.step .title{font-size:13px;font-weight:600;color:var(--text);margin-bottom:4px}
.step .desc{font-size:12px;color:var(--light)}

/* 常见问题卡片 */
.tips-card{background:#fff;border-radius:14px;padding:18px 20px;margin-bottom:16px;border:1px solid var(--border);font-size:13px;line-height:1.9;color:var(--gray)}
.tips-card h4{font-size:14px;font-weight:600;color:var(--text);margin-bottom:8px;display:flex;align-items:center;gap:6px}
.tips-card ul{padding-left:18px}
.tips-card li{margin-bottom:4px}
.tips-card .highlight{color:var(--primary);font-weight:600}

/* AI悬浮 */
.ai-fab{position:fixed;bottom:80px;right:16px;z-index:1000;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif}
.ai-btn{width:56px;height:56px;background:linear-gradient(135deg,#2563EB,#1D4ED8);color:#fff;border:none;border-radius:50%;font-size:26px;cursor:pointer;box-shadow:0 4px 16px rgba(37,99,235,0.3);position:relative;transition:opacity .2s}
.ai-btn:active{opacity:0.8}
.ai-btn .dot{position:absolute;top:4px;right:4px;width:10px;height:10px;background:#10B981;border-radius:50%;border:2px solid #fff}
.ai-box{display:none;position:fixed;bottom:150px;right:16px;width:360px;max-width:92vw;background:#fff;border-radius:16px;box-shadow:0 8px 40px rgba(0,0,0,0.12);overflow:hidden;flex-direction:column}
.ai-box.open{display:flex}
.ai-box .ai-head{display:flex;align-items:center;justify-content:space-between;padding:14px 16px;background:linear-gradient(90deg,#2563EB,#1D4ED8);color:#fff;font-size:14px;font-weight:600}
.ai-box .ai-head .close{background:none;border:none;color:#fff;font-size:18px;cursor:pointer;opacity:0.7}
.ai-msgs{height:300px;overflow-y:auto;padding:12px 14px;background:#F8FAFC}
.ai-msg{padding:8px 14px;margin-bottom:8px;border-radius:14px;font-size:14px;max-width:85%;line-height:1.6}
.ai-msg.bot{background:#fff;color:var(--text);border-radius:14px 14px 14px 4px;margin-right:auto;box-shadow:0 1px 2px rgba(0,0,0,0.04)}
.ai-msg.user{background:#2563EB;color:#fff;border-radius:14px 14px 4px 14px;margin-left:auto}
.ai-foot{display:flex;padding:10px 12px;background:#fff;border-top:1px solid var(--border);gap:8px}
.ai-foot input{flex:1;padding:10px 14px;border:1.5px solid var(--border);border-radius:24px;font-size:14px;outline:none}
.ai-foot input:focus{border-color:#2563EB}
.ai-foot button{width:40px;height:40px;background:#2563EB;color:#fff;border:none;border-radius:50%;font-size:16px;cursor:pointer;flex-shrink:0}
.ai-typing{color:var(--light);font-size:13px;padding:8px 14px;margin-bottom:8px}

.footer{background:#1E3A5F;color:rgba(255,255,255,0.7);padding:28px 20px 32px;text-align:center;margin-top:24px;font-size:13px;line-height:1.8}
.footer .f-copy{font-size:12px;opacity:0.4;margin-top:6px}

.toast{position:fixed;top:20px;left:50%;transform:translateX(-50%);background:#1F2937;color:#fff;padding:10px 24px;border-radius:24px;font-size:14px;z-index:9999;opacity:0;transition:opacity .3s;pointer-events:none;white-space:nowrap}
.toast.show{opacity:1}

@media(max-width:420px){
  .hero h1{font-size:19px}
  .form-row{flex-direction:column;gap:0}
  td .price{font-size:15px}
  th,td{padding:9px 5px;font-size:12px}
  .speed-label{font-size:13px}
  .steps{gap:8px}
  .step{min-width:100px;padding:10px 8px}
}