/* 飞个活儿 · 低空经济服务与交易平台 —— 共享样式（自包含，无外部依赖）*/
:root{
  --brand:#2E6FE8;--brand-d:#1e4fb0;--accent:#f97316;
  --ink:#1f2937;--muted:#64748b;--line:#e6ecf4;--bg:#f6f8fc;--card:#ffffff;
  --radius:16px;--shadow:0 10px 30px -12px rgba(20,40,80,.15);
  --maxw:1140px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.6;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 20px}

/* ===== 顶部导航 ===== */
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.94);
  backdrop-filter:saturate(180%) blur(8px);border-bottom:1px solid var(--line)}
.nav-wrap{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:19px;color:var(--brand)}
.brand img{height:30px;width:auto}
.nav{display:flex;align-items:center;gap:4px}
.nav a{padding:8px 14px;border-radius:10px;font-size:15px;color:#334155;font-weight:500;transition:.15s}
.nav a:hover{background:#eef3fd;color:var(--brand)}
.nav a.active{color:var(--brand);font-weight:700}
.nav .nav-cta{background:var(--brand);color:#fff}
.nav .nav-cta:hover{background:var(--brand-d);color:#fff}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:8px}
.nav-toggle span{width:22px;height:2px;background:#334155;border-radius:2px}
@media(max-width:860px){
  .nav{position:absolute;top:64px;left:0;right:0;flex-direction:column;align-items:stretch;
    background:#fff;border-bottom:1px solid var(--line);padding:10px 16px 16px;gap:2px;
    box-shadow:var(--shadow);display:none}
  .nav.open{display:flex}
  .nav a{padding:12px 10px}
  .nav-toggle{display:flex}
}

/* ===== 通用区块 ===== */
.section{padding:56px 0}
.section-tint{background:#eef3fd}
.section-head{text-align:center;max-width:720px;margin:0 auto 36px}
.eyebrow{color:var(--brand);font-weight:700;letter-spacing:.08em;font-size:13px;text-transform:uppercase;margin-bottom:8px}
.section-head h2{font-size:30px;line-height:1.25;margin-bottom:10px}
.section-desc{color:var(--muted);font-size:16px}
.page-head{padding:44px 0 8px;text-align:center}
.page-head h1{font-size:30px}
.page-head p{color:var(--muted);margin-top:8px}
.breadcrumb{color:var(--muted);font-size:14px;padding:18px 0}
.breadcrumb a{color:var(--brand)}

/* ===== 按钮 ===== */
.btn{display:inline-block;border:0;cursor:pointer;font:inherit;font-weight:600;
  padding:11px 24px;border-radius:40px;transition:.15s;text-align:center}
.btn-primary{background:var(--brand);color:#fff}
.btn-primary:hover{background:var(--brand-d)}
.btn-accent{background:var(--accent);color:#fff}
.btn-accent:hover{background:#ea580c}
.btn-ghost{background:#fff;color:var(--brand);border:1px solid var(--brand)}
.btn-ghost:hover{background:#eef3fd}
.btn-lg{padding:14px 34px;font-size:16px}
.btn-block{display:block;width:100%}

/* ===== Hero ===== */
.hero{background:linear-gradient(120deg,#0b2f6e 0%,#2E6FE8 60%,#4d8bff 100%);color:#fff;
  padding:76px 0 84px;position:relative;overflow:hidden}
.hero::after{content:"";position:absolute;right:-120px;top:-120px;width:420px;height:420px;
  background:radial-gradient(circle,rgba(255,255,255,.16),transparent 70%);border-radius:50%}
.hero .eyebrow{color:#bcd3ff}
.hero h1{font-size:42px;line-height:1.2;margin:6px 0 16px;max-width:760px}
.hero h1 .hl{color:#ffd166}
.hero p{font-size:18px;color:#dbe6ff;max-width:640px}
.hero-actions{margin-top:28px;display:flex;gap:14px;flex-wrap:wrap}
.hero-stats{margin-top:40px;display:flex;gap:44px;flex-wrap:wrap}
.hero-stats div strong{font-size:32px;display:block}
.hero-stats div span{color:#bcd3ff;font-size:14px}
@media(max-width:640px){.hero h1{font-size:32px}}

/* ===== 卡片网格 ===== */
.grid{display:grid;gap:22px}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
@media(max-width:900px){.grid-3{grid-template-columns:repeat(2,1fr)}}
@media(max-width:600px){.grid-3,.grid-2{grid-template-columns:1fr}}

.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  box-shadow:var(--shadow);overflow:hidden;transition:.18s}
.card:hover{transform:translateY(-5px)}
.card-thumb{height:180px;display:flex;align-items:center;justify-content:center;font-size:56px;color:#fff}
.card-body{padding:18px 20px}
.card-body h3{font-size:17px;margin-bottom:6px}
.card-body p{color:var(--muted);font-size:14px;min-height:42px}
.price{color:var(--accent);font-weight:800;font-size:20px}
.price small{color:var(--muted);font-weight:500;font-size:13px}
.tag{display:inline-block;background:#eef3fd;color:var(--brand);font-size:12px;
  font-weight:600;padding:3px 10px;border-radius:20px;margin-top:6px}
.card-foot{display:flex;align-items:center;justify-content:space-between;margin-top:14px}

/* 主题渐变（给缩略图上色，无需图片）*/
.g1{background:linear-gradient(135deg,#3b82f6,#1e40af)}
.g2{background:linear-gradient(135deg,#10b981,#065f46)}
.g3{background:linear-gradient(135deg,#f97316,#c2410c)}
.g4{background:linear-gradient(135deg,#8b5cf6,#5b21b6)}
.g5{background:linear-gradient(135deg,#0ea5e9,#0369a1)}
.g6{background:linear-gradient(135deg,#ef4444,#991b1b)}

/* ===== 资讯列表 ===== */
.article{display:flex;gap:18px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:18px;box-shadow:var(--shadow);margin-bottom:18px}
.article .thumb{flex:0 0 150px;height:104px;border-radius:12px;display:flex;align-items:center;
  justify-content:center;font-size:40px;color:#fff}
.article .a-body{flex:1;min-width:0}
.article h3{font-size:18px;margin-bottom:6px}
.article p{color:var(--muted);font-size:14px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.article .meta{margin-top:10px;display:flex;align-items:center;gap:16px;font-size:13px;color:var(--muted)}
.article .pay-link{color:var(--accent);font-weight:700}
@media(max-width:600px){.article{flex-direction:column}.article .thumb{flex:auto;width:100%;height:150px}}

/* 侧栏 */
.side-list{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow)}
.side-list h3{font-size:16px;margin-bottom:14px;padding-bottom:10px;border-bottom:2px solid var(--brand);display:inline-block}
.side-item{display:flex;gap:12px;padding:10px 0;border-bottom:1px dashed var(--line);font-size:14px}
.side-item:last-child{border:0}
.side-item .n{color:var(--brand);font-weight:800}

/* ===== 步骤卡 ===== */
.step{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px 20px;
  text-align:center;box-shadow:var(--shadow)}
.step .num{width:48px;height:48px;line-height:48px;border-radius:50%;background:var(--brand);
  color:#fff;font-size:22px;font-weight:800;margin:0 auto 14px}
.step h3{font-size:17px;margin-bottom:6px}
.step p{color:var(--muted);font-size:14px}

/* ===== 表单 ===== */
.form-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  box-shadow:var(--shadow);padding:28px;max-width:640px;margin:0 auto}
.form-card h3{font-size:20px;margin-bottom:18px}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.form-grid .full{grid-column:1/-1}
label{display:block;font-size:14px;font-weight:600;margin-bottom:6px}
input,select,textarea{width:100%;padding:11px 13px;border:1px solid #d7dee8;border-radius:10px;
  font:inherit;color:var(--ink);background:#fff}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3px #2e6fe822}
.form-msg{margin-top:12px;font-size:14px;min-height:20px}
.form-msg[data-kind=ok]{color:#059669}
.form-msg[data-kind=err]{color:#dc2626}
@media(max-width:600px){.form-grid{grid-template-columns:1fr}}

/* tabs（登录注册）*/
.tabs{display:flex;gap:8px;justify-content:center;margin-bottom:22px}
.tabs button{flex:1;padding:10px;border-radius:30px;border:1px solid var(--line);background:#fff;
  font-weight:700;color:var(--muted);cursor:pointer}
.tabs button.active{background:var(--brand);color:#fff;border-color:var(--brand)}
.tab-pane{display:none}
.tab-pane.active{display:block}

/* ===== 支付页 ===== */
.pay-box{max-width:420px;margin:0 auto;background:#fff;border:1px solid var(--line);
  border-radius:var(--radius);box-shadow:var(--shadow);padding:30px;text-align:center}
.pay-box .amt{color:var(--accent);font-size:34px;font-weight:800;margin:6px 0 4px}
.pay-box .qr{width:230px;height:230px;margin:18px auto;padding:10px;border:1px solid var(--line);border-radius:14px}
.pay-box .qr img{width:100%;height:100%;object-fit:contain}
.pay-note{color:var(--muted);font-size:13px;margin-top:10px}

/* ===== 模态框（商品详情）===== */
.modal{position:fixed;inset:0;background:rgba(15,23,42,.55);display:none;align-items:center;
  justify-content:center;z-index:100;padding:20px}
.modal.open{display:flex}
.modal-card{background:#fff;border-radius:20px;max-width:760px;width:100%;overflow:hidden}
.modal-grid{display:grid;grid-template-columns:1fr 1fr}
.modal-grid .m-img{min-height:280px;display:flex;align-items:center;justify-content:center;font-size:88px;color:#fff}
.modal-grid .m-info{padding:28px}
.modal-grid .m-info h3{font-size:22px;margin-bottom:12px}
.modal-close{position:absolute;top:16px;right:20px;font-size:30px;color:#fff;cursor:pointer;background:none;border:0}
@media(max-width:640px){.modal-grid{grid-template-columns:1fr}.modal-grid .m-img{min-height:180px}}

/* ===== 页脚 ===== */
.site-footer{background:#0f1b33;color:#aab7cc;padding:34px 0;text-align:center;font-size:14px;margin-top:20px}
.site-footer a{color:#aab7cc}
.site-footer a:hover{color:#fff}
.site-footer .sep{margin:0 8px;color:#3a4a66}
.site-footer .row2{margin-top:8px;color:#7d8ba5;font-size:13px}

/* 回到顶部 */
.to-top{position:fixed;right:22px;bottom:22px;width:46px;height:46px;border-radius:50%;
  background:var(--brand);color:#fff;border:0;font-size:22px;cursor:pointer;display:none;z-index:60;box-shadow:var(--shadow)}