/* ============================================================
   星链聚合 · 设计系统 v2
   字体：Inter + Noto Sans SC；图标：Font Awesome 6 (CDN)
   ============================================================ */
:root{
  --blue:#2563eb; --blue-2:#3b82f6; --cyan:#06b6d4; --violet:#7c3aed;
  --grad:linear-gradient(120deg,#2563eb,#06b6d4);
  --grad-v:linear-gradient(135deg,#7c3aed,#2563eb);
  --ink:#0f172a; --ink-2:#1e293b; --gray:#64748b; --gray-2:#94a3b8;
  --line:#e6ebf2; --bg:#ffffff; --bg-alt:#f6f9fe; --bg-soft:#eef4ff;
  --dark:#0b1120; --dark-2:#0f1b3d;
  --radius:18px; --radius-sm:12px;
  --shadow:0 12px 30px rgba(15,35,80,.08);
  --shadow-lg:0 24px 60px rgba(15,35,80,.16);
  --maxw:1200px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:84px}
body{
  font-family:"Inter","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.75;
  -webkit-font-smoothing:antialiased;overflow-x:hidden;
}
a{text-decoration:none;color:inherit}
img{max-width:100%;display:block}
ul{list-style:none}
::selection{background:rgba(37,99,235,.18);color:var(--ink)}
a:focus-visible,.btn:focus-visible,button:focus-visible{outline:2px solid var(--cyan);outline-offset:3px}
.container{width:min(var(--maxw),92%);margin:0 auto;position:relative;z-index:1}
.hl{color:var(--blue)}
.grad-text{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.muted{color:var(--gray)}

/* 按钮 */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 24px;border-radius:999px;font-weight:600;font-size:15px;
  border:1.6px solid transparent;cursor:pointer;transition:.28s;white-space:nowrap}
.btn-primary{background:var(--grad);color:#fff;box-shadow:0 10px 24px rgba(37,99,235,.3)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 16px 34px rgba(37,99,235,.42)}
.btn-ghost{background:rgba(255,255,255,.1);color:#fff;border-color:rgba(255,255,255,.55)}
.btn-ghost:hover{background:rgba(255,255,255,.22)}
.btn-outline{background:#fff;color:var(--blue);border-color:rgba(37,99,235,.35)}
.btn-outline:hover{border-color:var(--blue);background:var(--bg-soft);transform:translateY(-2px)}
.btn-lg{padding:15px 32px;font-size:16px}
.btn-block{width:100%}

/* ===== 导航 ===== */
.nav{position:fixed;top:0;left:0;right:0;z-index:200;transition:.35s;padding:16px 0}
.nav.scrolled{background:rgba(11,17,32,.9);backdrop-filter:blur(14px);box-shadow:0 6px 26px rgba(0,0,0,.25);padding:11px 0}
.nav-inner{display:flex;align-items:center;gap:22px}
.brand{display:flex;align-items:center;gap:11px}
.brand-logo{height:40px;width:auto;filter:drop-shadow(0 4px 10px rgba(37,99,235,.4))}
.brand-text{display:flex;flex-direction:column;line-height:1.05;color:#fff}
.brand-text strong{font-size:18px;letter-spacing:.5px}
.brand-text em{font-style:normal;font-size:12px;color:#7dd3fc;font-weight:500}
.nav-menu{display:flex;gap:6px;margin-left:auto}
.nav-menu a{color:rgba(255,255,255,.82);font-size:14.5px;font-weight:500;padding:8px 13px;border-radius:10px;transition:.22s}
.nav-menu a:hover,.nav-menu a.active{color:#fff;background:rgba(255,255,255,.1)}
.nav-cta{padding:10px 20px;font-size:14px;margin-left:6px}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:8px}
.nav-toggle span{width:24px;height:2.4px;background:#fff;border-radius:2px;transition:.3s}

/* ===== 通用区块 ===== */
.section{position:relative;padding:96px 0}
.section-alt{background:var(--bg-alt);position:relative;overflow:hidden}
.section-alt::before{content:"";position:absolute;top:-160px;right:-120px;width:460px;height:460px;border-radius:50%;background:radial-gradient(circle,rgba(37,99,235,.10),transparent 70%);z-index:0;pointer-events:none}
.section-dark{background:radial-gradient(1000px 500px at 80% -10%,rgba(6,182,212,.22),transparent),linear-gradient(160deg,var(--dark),var(--dark-2));color:#fff}
.sec-head{text-align:center;max-width:760px;margin:0 auto 56px}
.sec-kicker{display:inline-block;font-size:12.5px;letter-spacing:3px;font-weight:700;color:var(--blue);
  padding:6px 14px;border:1px solid rgba(37,99,235,.25);border-radius:999px;background:var(--bg-soft);margin-bottom:16px}
.section-dark .sec-kicker{color:#7dd3fc;border-color:rgba(125,211,252,.3);background:rgba(125,211,252,.08)}
.sec-title{font-size:36px;font-weight:800;margin-bottom:14px;letter-spacing:.3px}
.sec-desc{color:var(--gray);font-size:16.5px}
.section-dark .sec-desc{color:rgba(255,255,255,.78)}
.deco{position:absolute;pointer-events:none;z-index:0}
.deco-full{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.07;z-index:0;pointer-events:none}
#advantages .deco-full{opacity:.14}
.grid{display:grid;gap:26px;position:relative;z-index:1}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}

/* ===== 首屏 Hero ===== */
.hero{position:relative;padding:160px 0 100px;color:#fff;overflow:hidden;
  background:radial-gradient(1100px 620px at 82% -12%,rgba(6,182,212,.28),transparent),
             radial-gradient(800px 500px at 10% 10%,rgba(124,58,237,.22),transparent),
             linear-gradient(160deg,var(--dark),var(--dark-2))}
.hero-grid{position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.04) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.04) 1px,transparent 1px);background-size:54px 54px;mask-image:radial-gradient(circle at 50% 30%,#000,transparent 80%);z-index:0}
.hero-bg{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.45;mix-blend-mode:screen;z-index:0}
.glow{position:absolute;border-radius:50%;filter:blur(70px);opacity:.5;z-index:0}
.glow.a{width:380px;height:380px;background:#2563eb;top:-60px;right:8%}
.glow.b{width:320px;height:320px;background:#06b6d4;bottom:-80px;left:4%}
.hero-inner{position:relative;z-index:2;display:flex;align-items:center;gap:48px}
.hero-copy{flex:1.1}
.hero-tag{display:inline-flex;align-items:center;gap:8px;padding:7px 15px;border:1px solid rgba(255,255,255,.28);
  border-radius:999px;font-size:13px;color:#7dd3fc;margin-bottom:20px}
.hero-tag .dot{width:8px;height:8px;border-radius:50%;background:#34d399;box-shadow:0 0 0 4px rgba(52,211,153,.25)}
.hero-title{font-size:52px;line-height:1.18;font-weight:800;letter-spacing:.5px}
.hero-sub{margin:24px 0 32px;font-size:18px;color:rgba(255,255,255,.82);max-width:580px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap}
.hero-stats{list-style:none;display:flex;gap:14px;margin-top:46px;flex-wrap:wrap}
.hero-stats li{flex:1;min-width:120px;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12);
  border-radius:14px;padding:16px 18px;backdrop-filter:blur(6px)}
.hero-stats b{font-size:32px;font-weight:800;display:block;line-height:1}
.hero-stats b .suf{font-size:18px;color:#7dd3fc}
.hero-stats span{font-size:12.5px;color:rgba(255,255,255,.7);margin-top:6px;display:block}
.hero-art{flex:1;text-align:center;position:relative}
.hero-illust{max-width:100%;height:auto;filter:drop-shadow(0 26px 60px rgba(0,0,0,.4));animation:float 6s ease-in-out infinite}
.float-card{position:absolute;background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.18);
  backdrop-filter:blur(10px);border-radius:14px;padding:12px 16px;color:#fff;font-size:13px;box-shadow:var(--shadow-lg)}
.float-card.tl{top:8%;left:-4%;animation:float 5s ease-in-out infinite}
.float-card.br{bottom:10%;right:-2%;animation:float 6.5s ease-in-out infinite .8s}
.float-card b{color:#7dd3fc;font-size:17px}
.hero-scroll{position:absolute;left:50%;bottom:26px;transform:translateX(-50%);width:44px;height:44px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-size:26px;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.25);z-index:3;animation:bob 1.8s ease-in-out infinite;transition:.25s}
.hero-scroll:hover{color:#7dd3fc;border-color:#7dd3fc;background:rgba(255,255,255,.16)}
@keyframes bob{50%{transform:translate(-50%,8px)}}
@keyframes float{50%{transform:translateY(-14px)}}

/* ===== 数据带 ===== */
.stats-band{background:var(--grad);color:#fff;padding:46px 0}
.stats-band .container{display:flex;flex-wrap:wrap;justify-content:space-around;gap:24px;text-align:center}
.stat .num{font-size:40px;font-weight:800;line-height:1}
.stat .num .suf{font-size:22px}
.stat .lbl{font-size:14px;opacity:.92;margin-top:8px}

/* ===== 卡片通用 ===== */
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:32px 28px;
  box-shadow:var(--shadow);transition:.32s;position:relative;overflow:hidden}
.card:hover{transform:translateY(-8px);box-shadow:var(--shadow-lg);border-color:transparent}
.card::before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:var(--grad);transform:scaleX(0);transform-origin:left;transition:.32s;z-index:2}
.card:hover::before{transform:scaleX(1)}
.card .ico{width:60px;height:60px;border-radius:15px;display:flex;align-items:center;justify-content:center;
  margin-bottom:18px;color:#fff;font-size:24px}
.ico.blue{background:linear-gradient(135deg,#2563eb,#3b82f6)}
.ico.cyan{background:linear-gradient(135deg,#06b6d4,#22d3ee)}
.ico.violet{background:linear-gradient(135deg,#7c3aed,#a78bfa)}
.ico.rose{background:linear-gradient(135deg,#f43f5e,#fb7185)}
.ico.amber{background:linear-gradient(135deg,#f59e0b,#fbbf24)}
.card h3{font-size:20px;margin-bottom:10px}
.card p{color:var(--gray);font-size:15px}
.card .more{display:inline-flex;align-items:center;gap:6px;margin-top:14px;color:var(--blue);font-weight:600;font-size:14px}

/* ===== 图标列表 ===== */
.flist li{display:flex;gap:12px;align-items:flex-start;padding:9px 0;color:var(--ink-2);font-size:15px}
.flist li i{color:var(--blue);margin-top:4px}

/* ===== 解决方案 ===== */
.sol-ico{width:56px;height:56px;object-fit:contain;margin-bottom:16px}

/* ===== 广告样式 ===== */
.style-card{background:#fff;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:.32s;display:flex;flex-direction:column}
.style-card:hover{transform:translateY(-8px);box-shadow:var(--shadow-lg)}
.style-thumb{aspect-ratio:16/10;overflow:hidden;background:var(--bg-alt);position:relative}
.style-thumb img{width:100%;height:100%;object-fit:cover;transition:.45s}
.style-card:hover .style-thumb img{transform:scale(1.07)}
.style-thumb .badge{position:absolute;top:12px;left:12px;background:var(--grad);color:#fff;font-size:12px;font-weight:600;padding:5px 12px;border-radius:999px}
.style-card h3{font-size:18px;margin:16px 18px 6px}
.style-card p{color:var(--gray);font-size:14px;margin:0 18px;flex:1}
.style-ecpm{display:inline-block;margin:14px 18px 18px;font-size:13px;font-weight:600;color:var(--blue);
  background:var(--bg-soft);padding:6px 13px;border-radius:999px;align-self:flex-start}
.style-ecpm.hot{color:#e11d48;background:rgba(225,29,72,.08)}

/* ===== 竞价模式 ===== */
.bid-grid{margin-bottom:46px}
.bid-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px 28px;box-shadow:var(--shadow);position:relative;transition:.32s}
.bid-card:hover{transform:translateY(-8px);box-shadow:var(--shadow-lg)}
.bid-card h3{font-size:21px;margin-bottom:10px;display:flex;align-items:center;gap:10px}
.bid-desc{color:var(--gray);font-size:15px;margin-bottom:14px}
.bid-pros li{color:#059669;margin-bottom:7px;font-size:14.5px;display:flex;gap:8px}
.bid-cons li{color:var(--gray);margin-bottom:7px;font-size:14.5px;display:flex;gap:8px}
.bid-best{border:2px solid var(--blue);background:linear-gradient(180deg,rgba(37,99,235,.05),#fff)}
.bid-flag{position:absolute;top:-14px;right:24px;background:var(--grad);color:#fff;font-size:12px;font-weight:600;padding:6px 16px;border-radius:999px;box-shadow:var(--shadow)}
.vs-table{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);background:#fff;position:relative}
.vs-title{font-size:24px;margin-bottom:24px;text-align:center;font-weight:800;color:var(--ink)}
.vs-row{display:grid;grid-template-columns:1.1fr 1.5fr 1.5fr;padding:16px 22px;font-size:15px;transition:background .25s}
.vs-row+.vs-row{border-top:1px solid var(--line)}
.vs-row:hover{background:var(--bg-soft)}
.vs-head{background:var(--bg-alt);font-weight:700;color:var(--ink)}
.vs-row span:first-child{color:var(--ink);font-weight:600}
.vs-row span:nth-child(3){color:var(--gray)}
.vs-row:not(.vs-head) .vs-hl{font-weight:600;color:var(--ink-2)}
.vs-tag{display:inline-block;margin-left:8px;font-size:11px;font-weight:700;color:var(--blue);background:var(--bg-soft);border:1px solid rgba(37,99,235,.25);padding:2px 9px;border-radius:999px;vertical-align:middle}

/* ===== Logo 跑马灯 ===== */
.logo-marquee{overflow:hidden;-webkit-mask-image:linear-gradient(90deg,transparent,#000 10%,#000 90%,transparent);mask-image:linear-gradient(90deg,transparent,#000 10%,#000 90%,transparent)}
.logo-track{display:flex;gap:18px;width:max-content;animation:scroll 38s linear infinite}
.logo-marquee:hover .logo-track{animation-play-state:paused}
.logo-marquee{padding:6px 0}
.logo-track.reverse{animation-direction:reverse}
.logo-marquee .logo-track + .logo-track{margin-top:16px}
.logo-item{flex:0 0 auto;width:170px;height:96px;background:#fff;border:1px solid var(--line);border-radius:14px;
  display:flex;align-items:center;justify-content:center;padding:16px;box-shadow:var(--shadow)}
.logo-item img{max-height:100%;max-width:100%;object-fit:contain}
@keyframes scroll{to{transform:translateX(-50%)}}

/* ===== 合作媒体网格 ===== */
.media-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:16px}
.media-logo{background:#fff;border:1px solid var(--line);border-radius:14px;height:94px;display:flex;align-items:center;justify-content:center;padding:14px;transition:.3s;box-shadow:var(--shadow)}
.media-logo:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg);border-color:rgba(37,99,235,.4)}
.media-logo img{max-height:100%;max-width:100%;object-fit:contain}

/* ===== 客户案例 ===== */
.case-card{background:#fff;border-radius:var(--radius);padding:32px;box-shadow:var(--shadow);transition:.32s;border:1px solid var(--line)}
.case-card:hover{transform:translateY(-8px);box-shadow:var(--shadow-lg)}
.case-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:10px}
.case-tag{font-size:13px;font-weight:600;color:var(--blue);background:var(--bg-soft);padding:6px 13px;border-radius:999px}
.case-up{font-size:30px;font-weight:800;color:#e11d48}
.case-card h3{font-size:20px;margin-bottom:18px}
.case-bar-item{display:grid;grid-template-columns:96px 1fr 70px;align-items:center;gap:12px;margin-bottom:12px}
.cb-label{font-size:13px;color:var(--gray)}
.cb-track{height:13px;background:var(--bg-alt);border-radius:999px;overflow:hidden}
.cb-track i{display:block;height:100%;width:var(--w);background:#cbd5e1;border-radius:999px;transition:width 1.2s ease}
.cb-track.hl i{background:var(--grad)}
.cb-val{font-size:14px;font-weight:700;text-align:right}
.case-meta{display:flex;gap:18px;margin-top:18px;flex-wrap:wrap}
.case-meta div{font-size:13px;color:var(--gray)}
.case-meta b{display:block;color:var(--ink);font-size:16px}

/* ===== 数据图表 ===== */
.chart{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:38px 34px;box-shadow:var(--shadow);max-width:820px;margin:0 auto}
.chart-row{display:grid;grid-template-columns:100px 1fr 96px;align-items:center;gap:16px;margin-bottom:20px}
.chart-row:last-child{margin-bottom:0}
.chart-name{font-size:15px;font-weight:600}
.chart-track{height:20px;background:var(--bg-alt);border-radius:999px;overflow:hidden}
.chart-track i{display:block;height:100%;width:0;border-radius:999px;background:var(--grad);transition:width 1.3s cubic-bezier(.2,.8,.2,1)}
.chart.in-view .chart-track i{width:var(--w)}
.chart-val{font-size:14px;font-weight:700;text-align:right;color:var(--blue)}
.chart-note{text-align:center;color:var(--gray);font-size:14px;margin-top:18px}

/* ===== 评价 ===== */
.testi-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.testi-card{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.14);border-radius:var(--radius);padding:30px;backdrop-filter:blur(10px);position:relative}
.testi-card::before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,#7dd3fc,transparent);border-radius:var(--radius) var(--radius) 0 0}
.testi-card .quote{font-size:42px;color:rgba(125,211,252,.5);line-height:1;font-family:Georgia,serif}
.testi-card p{color:rgba(255,255,255,.88);font-size:15px;margin:14px 0 20px}
.testi-author{display:flex;align-items:center;gap:12px}
.testi-author b{color:#fff;font-size:15px;display:block}
.testi-author span{color:rgba(255,255,255,.6);font-size:13px}

/* ===== 时间线 ===== */
.timeline{position:relative;max-width:820px;margin:0 auto;padding-left:8px}
.timeline::before{content:"";position:absolute;left:19px;top:6px;bottom:6px;width:2px;background:linear-gradient(var(--blue),var(--cyan))}
.tl-item{position:relative;padding:0 0 34px 60px}
.tl-dot{position:absolute;left:10px;top:4px;width:20px;height:20px;border-radius:50%;background:var(--grad);border:4px solid #fff;box-shadow:0 0 0 3px rgba(37,99,235,.18)}
.tl-year{font-weight:800;color:var(--blue);font-size:17px}
.tl-item h4{font-size:18px;margin:4px 0 6px}
.tl-item p{color:var(--gray);font-size:15px}

/* ===== 价格 / 收费 ===== */
.price-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px;align-items:stretch}
.price-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:34px 30px;box-shadow:var(--shadow);display:flex;flex-direction:column;transition:.32s;position:relative}
.price-card:hover{transform:translateY(-8px);box-shadow:var(--shadow-lg)}
.price-card.featured{border:2px solid var(--blue);box-shadow:var(--shadow-lg)}
.price-flag{position:absolute;top:-14px;left:50%;transform:translateX(-50%);background:var(--grad);color:#fff;font-size:12px;font-weight:600;padding:6px 16px;border-radius:999px}
.price-card h3{font-size:21px;margin-bottom:6px}
.price-card .p-sub{color:var(--gray);font-size:14px;margin-bottom:18px}
.price-price{font-size:40px;font-weight:800;line-height:1;margin-bottom:4px}
.price-price .cur{font-size:20px;vertical-align:top}
.price-price .per{font-size:14px;color:var(--gray);font-weight:500}
.price-feat{margin:22px 0;flex:1}
.price-feat li{display:flex;gap:10px;padding:9px 0;font-size:14.5px;color:var(--ink-2);border-top:1px dashed var(--line)}
.price-feat li i{color:#059669;margin-top:4px}
.price-feat li.off{color:var(--gray-2)}
.price-feat li.off i{color:var(--gray-2)}

/* ===== FAQ ===== */
.faq-list{max-width:860px;margin:0 auto}
.faq-item{background:#fff;border:1px solid var(--line);border-radius:14px;margin-bottom:14px;padding:0 24px;box-shadow:var(--shadow);transition:.3s}
.faq-item:hover{box-shadow:var(--shadow-lg);border-color:rgba(37,99,235,.25);transform:translateY(-2px)}
.faq-item[open]{border-color:rgba(37,99,235,.4);box-shadow:var(--shadow-lg)}
.faq-item summary{cursor:pointer;font-weight:600;font-size:16.5px;padding:20px 0;list-style:none;display:flex;align-items:center;justify-content:space-between;gap:14px;transition:color .25s}
.faq-item summary:hover{color:var(--blue)}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";width:28px;height:28px;flex:0 0 auto;display:flex;align-items:center;justify-content:center;border-radius:50%;background:var(--bg-soft);color:var(--blue);font-size:20px;font-weight:600;transition:.3s}
.faq-item[open] summary::after{content:"−";background:var(--grad);color:#fff}
.faq-item p{padding:0 0 20px;color:var(--gray);font-size:15px}
.faq-cat{display:flex;align-items:center;gap:10px;font-size:14px;font-weight:800;color:var(--ink);letter-spacing:.5px;margin:38px 0 16px}
.faq-cat::before{content:"";width:4px;height:18px;border-radius:999px;background:var(--grad)}



/* ===== 内页 Hero ===== */
.page-hero{position:relative;padding:150px 0 70px;color:#fff;overflow:hidden;
  background:radial-gradient(900px 460px at 85% -10%,rgba(6,182,212,.28),transparent),
             linear-gradient(160deg,var(--dark),var(--dark-2))}
.page-hero .container{position:relative;z-index:2}
.crumb{font-size:13px;color:rgba(255,255,255,.6);margin-bottom:14px}
.crumb a:hover{color:#7dd3fc}
.page-hero h1{font-size:44px;font-weight:800;margin-bottom:12px}
.page-hero p{font-size:17px;color:rgba(255,255,255,.8);max-width:640px}

/* ===== 内容块 ===== */
.feature-row{display:grid;grid-template-columns:1fr 1fr;gap:50px;align-items:center;margin:30px 0}
.feature-row.rev{direction:rtl}
.feature-row.rev>*{direction:ltr}
.feature-row .fr-text h2{font-size:30px;font-weight:800;margin-bottom:14px}
.feature-row .fr-text p{color:var(--gray);margin-bottom:18px}
.feature-row .fr-media img{border-radius:var(--radius);box-shadow:var(--shadow-lg)}
.fr-photo{width:100%;height:auto;display:block;border-radius:var(--radius);box-shadow:var(--shadow-lg)}
.chip-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:8px}
.chip{font-size:13px;padding:7px 14px;border-radius:999px;background:var(--bg-soft);color:var(--blue);font-weight:500}
.callout{background:var(--bg-soft);border-left:4px solid var(--blue);border-radius:0 14px 14px 0;padding:20px 24px;margin:22px 0;color:var(--ink-2);font-size:15px}
.callout.dark{background:rgba(125,211,252,.1);border-left-color:#7dd3fc;color:rgba(255,255,255,.9)}

/* 步骤 */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;counter-reset:s}
.step{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px 24px;box-shadow:var(--shadow);position:relative}
.step .n{counter-increment:s;width:42px;height:42px;border-radius:12px;background:var(--grad);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:18px;margin-bottom:14px}
.step .n::before{content:counter(s)}
.step h4{font-size:17px;margin-bottom:6px}
.step p{color:var(--gray);font-size:14px}

/* ===== 联系表单 ===== */
.contact-wrap{display:grid;grid-template-columns:1.1fr 1fr;gap:40px;align-items:start}
.form{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:34px;box-shadow:var(--shadow)}
.field{margin-bottom:18px}
.field label{display:block;font-size:14px;font-weight:600;margin-bottom:8px}
.field input,.field textarea,.field select{width:100%;padding:13px 15px;border:1.6px solid var(--line);border-radius:12px;font-size:15px;font-family:inherit;transition:.2s;background:#fff;color:var(--ink)}
.field input:focus,.field textarea:focus,.field select:focus{outline:none;border-color:var(--blue);box-shadow:0 0 0 4px rgba(37,99,235,.12)}
.field textarea{resize:vertical;min-height:120px}
.form-note{font-size:13px;color:var(--gray);margin-top:10px}
.contact-info .info-item{display:flex;gap:14px;padding:18px 0;border-bottom:1px solid var(--line)}
.contact-info .info-item:last-child{border-bottom:0}
.contact-info .info-item .ic{width:46px;height:46px;border-radius:12px;background:var(--bg-soft);color:var(--blue);display:flex;align-items:center;justify-content:center;font-size:20px;flex:0 0 auto}
.contact-info .info-item b{display:block;font-size:16px}
.contact-info .info-item span{color:var(--gray);font-size:14px}
.map{margin-top:20px;border-radius:var(--radius);overflow:hidden;border:1px solid var(--line);height:220px;background:linear-gradient(135deg,#e0e7ff,#cffafe);display:flex;align-items:center;justify-content:center;color:var(--gray);font-size:14px}
.map img{width:100%;height:100%;object-fit:cover;display:block}

/* ===== CTA ===== */
.cta{position:relative;padding:100px 0;color:#fff;text-align:center;
  background:linear-gradient(135deg,rgba(11,17,32,.85),rgba(11,17,32,.68)),url(../images/fengfei__feature-bottom-left.png) center/cover no-repeat}
.cta-inner{position:relative;z-index:2}
.cta h2{font-size:38px;font-weight:800;margin-bottom:14px}
.cta p{font-size:17px;color:rgba(255,255,255,.85);margin-bottom:32px}
.cta-actions{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
.cta-contact{margin-top:36px;display:flex;gap:30px;justify-content:center;flex-wrap:wrap;font-size:14px;color:rgba(255,255,255,.85)}

/* ===== 页脚 ===== */
.footer{background:var(--dark);color:rgba(255,255,255,.68);padding:64px 0 0}
.footer-inner{display:grid;grid-template-columns:1.8fr 1fr 1fr 1fr;gap:34px}
.footer-logo{height:42px;margin-bottom:16px}
.footer-brand p{font-size:14px;line-height:1.7;max-width:320px}
.footer-col h4{color:#fff;font-size:15px;margin-bottom:16px}
.footer-col a{display:block;font-size:14px;color:rgba(255,255,255,.68);margin-bottom:11px;transition:.2s}
.footer-col a:hover{color:#7dd3fc;padding-left:4px}
.footer-social{display:flex;gap:12px;margin-top:18px}
.footer-social a{width:40px;height:40px;border-radius:50%;background:rgba(255,255,255,.08);display:flex;align-items:center;justify-content:center;color:#fff;font-size:16px;transition:.25s}
.footer-social a:hover{background:var(--blue);transform:translateY(-3px)}
.footer-bar{border-top:1px solid rgba(255,255,255,.1);margin-top:46px;padding:20px 0;font-size:13px;text-align:center;color:rgba(255,255,255,.5)}

/* ===== 返回顶部 ===== */
.to-top{position:fixed;right:24px;bottom:24px;width:48px;height:48px;border-radius:50%;background:var(--grad);color:#fff;border:0;font-size:20px;cursor:pointer;box-shadow:var(--shadow);opacity:0;visibility:hidden;transform:translateY(12px);transition:.3s;z-index:150}
.to-top.show{opacity:1;visibility:visible;transform:translateY(0)}
.to-top:hover{transform:translateY(-3px)}

/* ===== 滚动揭示 ===== */
.reveal{opacity:0;transform:translateY(34px);transition:.7s cubic-bezier(.2,.8,.2,1)}
.reveal.in-view{opacity:1;transform:none}
.reveal.d1{transition-delay:.08s}.reveal.d2{transition-delay:.16s}.reveal.d3{transition-delay:.24s}.reveal.d4{transition-delay:.32s}

/* ===== 响应式 ===== */
@media (max-width:1080px){
  .media-grid{grid-template-columns:repeat(4,1fr)}
  .footer-inner{grid-template-columns:1fr 1fr}
}
@media (max-width:920px){
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .grid-3{grid-template-columns:repeat(2,1fr)}
  .testi-grid,.price-grid{grid-template-columns:1fr}
  .feature-row{grid-template-columns:1fr;gap:26px}
  .feature-row.rev{direction:ltr}
  .contact-wrap{grid-template-columns:1fr}
  .steps{grid-template-columns:repeat(2,1fr)}
  .hero-inner{flex-direction:column;text-align:center}
  .hero-sub{margin-left:auto;margin-right:auto}
  .hero-stats{justify-content:center}
  .hero-art{order:-1;max-width:420px;margin:0 auto}
  .hero-title{font-size:40px}
}
@media (max-width:768px){
  .nav-menu{position:fixed;top:64px;left:0;right:0;flex-direction:column;gap:0;
    background:rgba(11,17,32,.97);backdrop-filter:blur(14px);padding:10px 0;
    transform:translateY(-130%);transition:.35s;box-shadow:0 14px 34px rgba(0,0,0,.34);max-height:calc(100vh - 64px);overflow:auto}
  .nav-menu.open{transform:translateY(0)}
  .nav-menu a{padding:15px 24px;width:100%;border-radius:0}
  .nav-menu a:hover,.nav-menu a.active{background:rgba(255,255,255,.08)}
  .nav-toggle{display:flex;margin-left:auto}
  .nav-cta{display:none}
  .section{padding:70px 0}
  .sec-title{font-size:28px}
  .page-hero h1{font-size:34px}
  .hero-title{font-size:33px}
  .grid-2{grid-template-columns:1fr}
  .grid-3,.grid-4{display:flex;gap:16px;overflow-x:auto;scroll-snap-type:x mandatory;-webkit-overflow-scrolling:touch;padding-bottom:6px;scrollbar-width:none}
  .grid-3::-webkit-scrollbar,.grid-4::-webkit-scrollbar{display:none}
  .grid-3>*,.grid-4>*{flex:0 0 80%;max-width:80%;scroll-snap-align:start}
  .media-grid{grid-template-columns:repeat(3,1fr)}
  .vs-row{grid-template-columns:1fr;gap:4px;padding:16px 18px}
  .vs-row:not(.vs-head) span:first-child{color:var(--blue)}
  .chart-row{grid-template-columns:80px 1fr 72px;gap:10px}
  .footer{padding:48px 0 0}
  .cta-contact{flex-direction:column;gap:10px}
  .footer-inner{grid-template-columns:1fr 1fr;gap:22px}
  .footer-brand{grid-column:1 / -1}
  .case-bar-item{grid-template-columns:84px 1fr 64px}
}
@media (max-width:460px){
  .media-grid{grid-template-columns:repeat(2,1fr)}
  .hero-stats li{min-width:calc(50% - 7px)}
}

/* ===== 手机样机 ===== */
.phone{position:relative;width:200px;max-width:62%;margin:0 auto;aspect-ratio:9/18.6;background:#0b1120;
  border-radius:34px;padding:9px;box-shadow:var(--shadow-lg);border:1px solid rgba(255,255,255,.12);flex:0 0 auto}
.phone::before{content:"";position:absolute;top:12px;left:50%;transform:translateX(-50%);width:48px;height:5px;border-radius:5px;background:#1f2937;z-index:3}
.phone .screen{width:100%;height:100%;border-radius:24px;overflow:hidden;background:#0f172a}
.phone .screen img{width:100%;height:100%;object-fit:cover;display:block}
.phone.tilt{transform:rotate(-3deg)}
.phone.float{animation:float 6s ease-in-out infinite}
.case-card{display:flex;gap:24px;align-items:center}
.case-media{flex:0 0 184px}
.case-body{flex:1;min-width:0}
.avatar{width:46px;height:46px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:16px;flex:0 0 auto}
.team-photo{aspect-ratio:16/10;overflow:hidden;background:linear-gradient(135deg,#2563eb,#06b6d4);border-radius:var(--radius-sm)}
.team-photo img{width:100%;height:100%;object-fit:cover;display:block}
.news-thumb.grad{display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#2563eb,#06b6d4);color:rgba(255,255,255,.88);font-size:46px}
.style-thumb.phone-wrap{aspect-ratio:auto;overflow:visible;padding:28px 0;background:var(--bg-alt)}
.style-thumb.phone-wrap .phone{width:178px}

/* 移动端广告样式滑动指示点 */
.styles-dots{display:none;justify-content:center;gap:8px;margin-top:18px}
.styles-dots .dot{width:9px;height:9px;border-radius:50%;border:0;background:rgba(37,99,235,.25);cursor:pointer;padding:0;transition:.25s}
.styles-dots .dot.active{background:var(--blue);width:22px;border-radius:999px}

/* 移动端广告样式横向滑动 */
@media (max-width:768px){
  .styles-grid{display:flex;gap:16px;overflow-x:auto;scroll-snap-type:x mandatory;-webkit-overflow-scrolling:touch;padding-bottom:6px;scrollbar-width:none}
  .styles-grid::-webkit-scrollbar{display:none}
  .styles-grid .style-card{flex:0 0 80%;max-width:80%;scroll-snap-align:start}
  .styles-dots{display:flex}
}
@media (max-width:600px){
  .case-card{flex-direction:column;text-align:center}
  .case-media{flex:none}
  .case-top{justify-content:center}
}