/* ═══════════ 秒算侠落地页 ═══════════ */
:root{
  --primary:#4f46e5;
  --primary-dark:#4338ca;
  --grad1:#4f46e5;
  --grad2:#2563eb;
  --accent:#f59e0b;
  --success:#16a34a;
  --red:#dc2626;
  --bg:#f0f4ff;
  --card:#fff;
  --text:#1e293b;
  --sub:#64748b;
  --border:#e2e8f0;
  --radius:16px;
  --shadow:0 2px 8px rgba(0,0,0,.06);
  --shadow-lg:0 12px 32px rgba(37,99,235,.18);
  --font-body:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Segoe UI",Roboto,sans-serif;
}
@font-face{
  font-family:"Smiley Sans";
  src:url("/assets/fonts/smiley-subset-v5.woff2") format("woff2");
  font-weight:normal;font-style:normal;font-display:swap;
}
.font-display{font-family:"Smiley Sans","PingFang SC",sans-serif;letter-spacing:.5px}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:72px}
body{font-family:var(--font-body);background:var(--bg);color:var(--text);line-height:1.6;font-size:16px;-webkit-font-smoothing:antialiased;overflow-x:hidden}
img{max-width:100%;display:block}
a{text-decoration:none;color:inherit}
.container{max-width:1080px;margin:0 auto;padding:0 20px}
.section{padding:64px 20px}
.section-alt{background:linear-gradient(180deg,#eef2ff 0%,#fff 100%)}
.section-title{font-size:34px;text-align:center;margin-bottom:8px;color:var(--text)}
.section-desc{text-align:center;color:var(--sub);margin-bottom:44px}

/* ── 按钮 ── */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border-radius:12px;padding:0 22px;height:46px;font-size:16px;font-weight:600;cursor:pointer;border:1.5px solid transparent;transition:transform .15s,box-shadow .15s,background .15s;white-space:nowrap}
.btn:active{transform:scale(.97)}
.btn-lg{height:52px;padding:0 28px;font-size:17px}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-dark);box-shadow:0 6px 16px rgba(79,70,229,.3)}
.btn-outline{border-color:var(--primary);color:var(--primary);background:transparent}
.btn-outline:hover{background:rgba(79,70,229,.06)}
.btn-gradient{background:linear-gradient(135deg,var(--grad1),var(--grad2));color:#fff;box-shadow:var(--shadow-lg)}
.btn-ghost{color:#fff;border-color:rgba(255,255,255,.5);background:transparent}
.btn-ghost:hover{background:rgba(255,255,255,.15)}
.btn-white{background:#fff;color:var(--primary);border-color:#fff;box-shadow:0 4px 14px rgba(0,0,0,.18)}
.btn-white:hover{background:#eef2ff;color:var(--primary-dark);box-shadow:0 6px 18px rgba(0,0,0,.22)}
.btn-disabled{background:#e2e8f0;color:#94a3b8;cursor:not-allowed}

/* ── 导航 ── */
.nav{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.85);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-bottom:1px solid var(--border)}
.nav-inner{max-width:1080px;margin:0 auto;padding:10px 20px;display:flex;align-items:center;gap:24px}
.brand{display:flex;align-items:center;gap:10px;font-size:22px;font-weight:700;color:var(--primary)}
.brand img{border-radius:10px}
.nav-links{display:flex;gap:28px;margin-left:12px;font-size:16px;color:var(--text)}
.nav-links a:hover{color:var(--primary)}
.nav-cta{margin-left:auto}
.nav-toggle{display:none;margin-left:auto;background:none;border:none;cursor:pointer;flex-direction:column;gap:5px;padding:8px}
.nav-toggle span{width:24px;height:2.5px;background:var(--text);border-radius:2px;transition:.25s}

/* ── Hero ── */
.hero{position:relative;overflow:hidden;background:linear-gradient(150deg,#4f46e5 0%,#2563eb 70%,#1d4ed8 100%);color:#fff;padding:72px 0 96px}
.hero-bg{position:absolute;inset:0;background:
  radial-gradient(600px 300px at 85% 10%,rgba(255,255,255,.12),transparent 60%),
  radial-gradient(500px 300px at 10% 90%,rgba(245,158,11,.18),transparent 60%);pointer-events:none}
.hero-inner{position:relative;display:flex;align-items:center;gap:56px}
.hero-text{flex:1.1}
.hero-tag{display:inline-block;padding:6px 14px;border-radius:999px;background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.3);font-size:14px;margin-bottom:20px}
.hero-title{font-size:64px;line-height:1.12;margin-bottom:20px;text-shadow:0 2px 20px rgba(0,0,0,.15)}
.hero-sub{font-size:18px;color:rgba(255,255,255,.92);margin-bottom:28px}
.hero-cta{display:flex;gap:16px;flex-wrap:wrap;margin-bottom:24px}
.hero-points{list-style:none;display:flex;gap:24px;flex-wrap:wrap;color:rgba(255,255,255,.9);font-size:15px}
.hero-phone{flex:0 0 300px;position:relative}
.phone-frame{position:relative;border-radius:30px;background:#0f172a;padding:10px;box-shadow:0 20px 60px rgba(0,0,0,.35);border:1px solid rgba(255,255,255,.2)}
.phone-frame img{border-radius:22px;width:100%}
.phone-shadow{position:absolute;inset:6% 8% -30px;background:radial-gradient(ellipse at center,rgba(0,0,0,.4),transparent 70%);z-index:-1;filter:blur(10px)}

/* ── 卡片通用 ── */
.card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:24px;transition:transform .2s,box-shadow .2s}
.card:hover{transform:translateY(-2px);box-shadow:0 8px 20px rgba(2,6,23,.08)}

/* ── 四大模式 ── */
.modes{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-bottom:56px}
.mode{text-align:center;padding:32px 22px}
.mode-icon{width:44px;height:44px;margin:0 auto 14px;display:block}
.mode-title{font-size:24px;margin-bottom:10px;color:var(--primary)}
.mode p{color:var(--sub);font-size:15px}

/* ── 六宫格特性 ── */
.features{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.feat{padding:26px}
.feat-icon{width:32px;height:32px;margin-bottom:12px}
.feat h3{font-size:18px;margin-bottom:8px}
.feat p{color:var(--sub);font-size:14.5px}

/* ── 画廊 ── */
.gallery{display:flex;gap:24px;overflow-x:auto;padding:12px 4px 20px;scroll-snap-type:x mandatory}
.gallery-item{flex:0 0 auto;scroll-snap-align:center;text-align:center}
.phone-frame.sm{width:230px;padding:7px;border-radius:24px;box-shadow:0 14px 34px rgba(37,99,235,.18)}
.phone-frame.sm img{border-radius:18px}
.gallery-item figcaption{margin-top:12px;color:var(--sub);font-size:14px;width:230px}

/* ── 下载 ── */
.download-wrap{display:grid;grid-template-columns:1.6fr 1fr;gap:20px;margin-bottom:24px}
.download-card{padding:28px}
.dl-android,.dl-ios{display:flex;align-items:center;gap:18px;padding:18px 0}
.dl-android{border-bottom:1px solid var(--border)}
.dl-icon{width:40px;height:40px}
.dl-info{flex:1}
.dl-info h3{font-size:20px;margin-bottom:4px}
.dl-meta{color:var(--sub);font-size:14px}
.dl-note{margin:14px 0 0;padding:12px 16px;background:#f0f4ff;border-radius:10px;color:var(--sub);font-size:13.5px}
.dl-note p{margin:0}
.download-qr{text-align:center;padding:28px;display:flex;flex-direction:column;align-items:center;gap:12px}
.download-qr img{border-radius:12px;border:1px solid var(--border)}
.download-qr p{color:var(--sub);font-size:14px}
.wechat-entry{display:flex;align-items:center;justify-content:space-between;gap:32px;padding:28px 32px;flex-wrap:wrap;background:linear-gradient(135deg,rgba(79,70,229,.04) 0%,#fff 100%)}
.wechat-info{flex:1 1 340px;min-width:0}
.wechat-badge{display:inline-block;padding:4px 12px;border-radius:999px;background:#07c160;color:#fff;font-size:13px;font-weight:600;margin-bottom:14px;letter-spacing:.5px}
.wechat-info h3{font-size:22px;margin-bottom:8px;color:var(--text)}
.wechat-desc{color:var(--sub);font-size:15px;margin-bottom:14px}
.wechat-features{list-style:none;padding:0;margin:0 0 18px}
.wechat-features li{padding:6px 0;color:var(--sub);font-size:14px}
.wechat-features strong{color:var(--text);font-weight:600}
.wechat-qr{flex:0 0 auto;text-align:center}
.wechat-qr img{width:180px;height:180px;border-radius:12px;border:1px solid var(--border)}
.wechat-qr p{color:var(--sub);font-size:13px;margin-top:8px}

/* ── VIP ── */
.plans{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-bottom:40px}
.plan{position:relative;text-align:center;padding:30px 20px;display:flex;flex-direction:column;align-items:center;gap:8px}
.plan h3{font-size:22px;color:var(--text)}
.plan-price{font-size:17px;margin:8px 0 12px}
.plan-price span{font-size:44px;color:var(--accent);font-weight:700}
.plan-price em{font-style:normal;color:var(--sub);font-size:14px}
.plan ul{list-style:none;color:var(--sub);font-size:14.5px;margin-bottom:18px;flex:1}
.plan ul li{padding:4px 0}
.plan .btn{width:100%}
.plan-hot{border:2px solid var(--primary);box-shadow:var(--shadow-lg)}
.plan-badge{position:absolute;top:-13px;left:50%;transform:translateX(-50%);background:var(--primary);color:#fff;font-size:12.5px;padding:4px 14px;border-radius:999px;white-space:nowrap}
.plan-lifetime{border:2px solid transparent;background:linear-gradient(var(--card),var(--card)) padding-box,linear-gradient(135deg,var(--grad1),var(--grad2)) border-box}
.vip-benefits{max-width:640px;margin:0 auto;text-align:center}
.vip-benefits h3{font-size:20px;margin-bottom:16px}
.vip-benefits ul{list-style:none;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin-bottom:18px}
.vip-benefits li{background:#fff;border:1px solid var(--border);border-radius:12px;padding:12px;font-size:14.5px}
.vip-list li{display:flex;flex-direction:column;align-items:center;gap:6px;text-align:center}
.plat{display:inline-block;padding:2px 10px;border-radius:999px;background:rgba(79,70,229,.08);color:var(--primary);font-size:12px;font-weight:600;letter-spacing:.3px;white-space:nowrap}
.vip-tip{color:var(--sub);font-size:13.5px}

/* ── 免费 vs VIP 对比（卡片网格） ── */
.compare-wrap{max-width:760px;margin:0 auto 48px;text-align:center}
.compare-title{font-size:20px;text-align:center;margin-bottom:16px}
.compare-grid{display:grid;gap:8px}
.cg-row{display:grid;grid-template-columns:1.5fr 1fr 1fr;align-items:center;background:#fff;border:1px solid var(--border);border-radius:12px;padding:11px 16px;box-shadow:var(--shadow);font-size:15px}
.cg-row.cg-head{background:linear-gradient(135deg,var(--grad1),var(--grad2));color:#fff;border:none;font-weight:600;font-size:15px;box-shadow:var(--shadow-lg)}
.cg-name{text-align:left;color:var(--text)}
.cg-head .cg-name{color:#fff}
.cg-cell{text-align:center;color:var(--sub)}
.cg-head .cg-cell{color:#fff}
.cg-row.cg-head .cg-cell{color:rgba(255,255,255,.95)}
.cg-cell.cg-yes{color:var(--success);font-weight:700}
.cg-cell.cg-no{color:#cbd5e1}
.cg-cell.cg-vip{color:var(--accent);font-weight:700}
.tag-soon{display:inline-block;background:#fef3c7;color:#b45309;font-size:11.5px;font-weight:600;padding:2px 8px;border-radius:999px;white-space:nowrap;vertical-align:middle}

/* ── 安全 ── */
.safes{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.safe{text-align:center;padding:30px 22px}
.safe-icon{width:38px;height:38px;margin-bottom:14px}
.safe h3{font-size:18px;margin-bottom:8px}
.safe p{color:var(--sub);font-size:14.5px}

/* ── 页脚 ── */
.footer{background:#0f172a;color:#94a3b8;padding:40px 20px;margin-top:0}
.footer-inner{display:flex;flex-direction:column;align-items:center;gap:10px;text-align:center}
.footer-brand{display:flex;align-items:center;gap:8px;color:#fff;font-size:18px;font-weight:700}
.footer-brand img{border-radius:8px}
.footer-links a{color:#cbd5e1;margin:0 6px}
.footer-links a:hover{color:#fff}
.footer-icp a{color:#94a3b8}
.footer-icp a:hover{color:#fff}
.footer-copy{font-size:13px}

/* ── 淡入动画 ── */
.reveal{opacity:0;transform:translateY(18px);transition:opacity .6s ease,transform .6s ease}
.reveal.visible{opacity:1;transform:none}

/* ── 应用介绍 / 文章板块 ── */
.story-article{max-width:760px;margin:0 auto;padding:40px 36px}

/* ── 响应式 ── */
@media (max-width:900px){
  .modes{grid-template-columns:repeat(2,1fr)}
  .features{grid-template-columns:repeat(2,1fr)}
  .safes{grid-template-columns:repeat(2,1fr)}
  .plans{grid-template-columns:repeat(2,1fr)}
  .hero-inner{flex-direction:column;text-align:center;gap:40px}
  .hero-phone{flex-basis:auto}
  .hero-cta,.hero-points{justify-content:center}
  .hero-title{font-size:48px}
}
@media (max-width:640px){
  .nav-links{display:none}
  .nav-cta{display:none}
  .nav-toggle{display:flex}
  .nav-links.open{display:flex;position:absolute;top:100%;left:0;right:0;background:#fff;flex-direction:column;padding:16px 20px;gap:16px;border-bottom:1px solid var(--border);box-shadow:var(--shadow)}
  .modes{grid-template-columns:1fr}
  .features{grid-template-columns:1fr}
  .safes{grid-template-columns:1fr}
  .plans{grid-template-columns:1fr}
  .download-wrap{grid-template-columns:1fr}
  /* 下载行：窄屏按钮换行整行，避免横向溢出 */
  .dl-android,.dl-ios{flex-wrap:wrap;gap:12px}
  .dl-info{flex:1 1 140px;min-width:0}
  .dl-android .btn,.dl-ios .btn{width:100%;height:46px;font-size:15px}
  .download-qr img{width:150px;height:150px}
  .wechat-entry{gap:20px;padding:22px}
  .wechat-qr{width:100%}
  .wechat-qr img{width:150px;height:150px}
  .wechat-info .btn{width:100%}
  .section-title{font-size:28px}
  .hero-title{font-size:40px}
  .vip-benefits ul{grid-template-columns:repeat(2,minmax(0,1fr))}
  .cg-row{grid-template-columns:1.3fr 1fr 1fr;padding:9px 10px;font-size:13.5px}
  .compare-wrap{margin-bottom:36px}
  .story-article{padding:28px 20px}
  .story-title{font-size:22px}
  .story-body{font-size:15px;line-height:1.8}
  .story-body h4{font-size:17px}
}

/* 文章封面（1200 宽 WebP，13-23KB；原 PNG 2.8-3.5MB 会拖慢加载并压缩 Bing 抓取配额） */
.article-cover{margin:0 0 30px}
.article-cover img{width:100%;height:auto;border-radius:14px;display:block}