/* ============================================================
   SLY.PW 青岛上流文化传媒有限公司 — PC 官网样式
   设计语言：红白为主 + 黑色装饰 · 科技感 · 上升箭头母题
   ============================================================ */
:root{
  --red:#E4332B; --red-hi:#FF4A3D; --red-deep:#A80F18; --red-soft:#FCEDEB;
  --ink:#0A0A0C; --ink-2:#14141A; --ink-3:#23232B;
  --paper:#FFFFFF; --paper-2:#F7F5F2; --line:#ECEAE6;
  --gray:#8A8A94; --gray-2:#55555E;
  --font:-apple-system,BlinkMacSystemFont,"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei",sans-serif;
  --mono:"SF Mono",ui-monospace,Menlo,Consolas,monospace;
  --shadow-lg:0 24px 64px -24px rgba(168,15,24,.18),0 4px 16px rgba(10,10,12,.06);
  --ease:cubic-bezier(.22,1,.36,1);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:var(--font);background:var(--paper);color:var(--ink);line-height:1.6;overflow-x:hidden;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
::selection{background:var(--red);color:#fff}

/* ---------- 通用 ---------- */
.wrap{max-width:1280px;margin:0 auto;padding:0 48px}
.eyebrow{display:inline-flex;align-items:center;gap:10px;font-family:var(--mono);font-size:12px;letter-spacing:.28em;color:var(--red);text-transform:uppercase}
.eyebrow::before{content:"";width:26px;height:2px;background:var(--red)}
.h2{font-size:clamp(30px,3.4vw,46px);font-weight:800;line-height:1.18;letter-spacing:-.02em;margin:14px 0 12px}
.h2 .rd{color:var(--red)}
.lead{color:var(--gray-2);font-size:16px;max-width:640px}
.sec{padding:110px 0}
.sec-dark{background:var(--ink);color:#fff}
.sec-dark .lead{color:#A8A8B2}

/* 滚动显现 */
.rv{opacity:0;transform:translateY(34px);transition:opacity .8s var(--ease),transform .8s var(--ease)}
.rv.in{opacity:1;transform:none}
.rv-d1{transition-delay:.1s}.rv-d2{transition-delay:.2s}.rv-d3{transition-delay:.3s}.rv-d4{transition-delay:.4s}

/* ---------- 导航 ---------- */
.nav{position:fixed;top:0;left:0;right:0;z-index:100;background:rgba(255,255,255,.82);backdrop-filter:blur(18px) saturate(1.4);-webkit-backdrop-filter:blur(18px) saturate(1.4);border-bottom:1px solid transparent;transition:border-color .3s,background .3s}
.nav.scrolled{border-bottom-color:var(--line)}
.nav-in{max-width:1280px;margin:0 auto;padding:0 48px;height:74px;display:flex;align-items:center;gap:40px}
.brand{display:flex;align-items:center;gap:14px;font-weight:800;font-size:20px;letter-spacing:-.02em}
.brand svg{display:block}
.brand small{display:block;font-size:10.5px;font-weight:500;color:var(--gray);letter-spacing:.16em;font-family:var(--mono)}
.nav-links{display:flex;gap:34px;margin-left:auto}
.nav-links a{font-size:14.5px;font-weight:500;color:var(--ink-2);position:relative;padding:6px 0}
.nav-links a::after{content:"";position:absolute;left:0;bottom:0;width:0;height:2px;background:var(--red);transition:width .3s var(--ease)}
.nav-links a:hover::after{width:100%}
.btn{display:inline-flex;align-items:center;gap:8px;background:var(--red);color:#fff;font-weight:600;font-size:14.5px;padding:12px 26px;border-radius:999px;transition:transform .25s var(--ease),box-shadow .25s var(--ease),background .25s;box-shadow:0 10px 28px -10px rgba(228,51,43,.55)}
.btn:hover{transform:translateY(-2px);background:var(--red-hi);box-shadow:0 16px 36px -10px rgba(228,51,43,.6)}
.btn-ghost{background:transparent;color:var(--ink);box-shadow:inset 0 0 0 1.5px var(--ink)}
.btn-ghost:hover{background:var(--ink);color:#fff;box-shadow:none}
.nav .btn{padding:10px 22px;font-size:13.5px}

/* ---------- HERO ---------- */
.hero{position:relative;min-height:100vh;display:flex;align-items:center;padding:140px 0 90px;overflow:hidden;background:
  radial-gradient(900px 500px at 85% -10%,rgba(228,51,43,.10),transparent 60%),
  radial-gradient(700px 420px at -10% 110%,rgba(228,51,43,.07),transparent 60%),
  var(--paper)}
#hero-canvas{position:absolute;inset:0;width:100%;height:100%;pointer-events:none}
.hero-grid{position:absolute;inset:0;background-image:linear-gradient(var(--line) 1px,transparent 1px),linear-gradient(90deg,var(--line) 1px,transparent 1px);background-size:72px 72px;mask-image:radial-gradient(ellipse 90% 80% at 50% 40%,#000 30%,transparent 75%);-webkit-mask-image:radial-gradient(ellipse 90% 80% at 50% 40%,#000 30%,transparent 75%);opacity:.7}
.hero-in{position:relative;z-index:2;display:grid;grid-template-columns:1.15fr .85fr;gap:60px;align-items:center}
.hero-tag{display:inline-flex;align-items:center;gap:10px;background:var(--red-soft);color:var(--red);border:1px solid rgba(228,51,43,.22);font-size:13px;font-weight:600;padding:8px 18px;border-radius:999px;margin-bottom:28px}
.hero-tag .dot{width:8px;height:8px;border-radius:50%;background:var(--red);animation:pulse 1.8s infinite}
@keyframes pulse{0%,100%{box-shadow:0 0 0 0 rgba(228,51,43,.45)}55%{box-shadow:0 0 0 9px rgba(228,51,43,0)}}
.hero h1{font-size:clamp(44px,5.6vw,84px);line-height:1.06;font-weight:900;letter-spacing:-.03em}
.hero h1 .rd{color:var(--red)}
.hero h1 .stroke{color:transparent;-webkit-text-stroke:2px var(--ink)}
.hero-sub{margin:26px 0 38px;font-size:17.5px;color:var(--gray-2);max-width:560px}
.hero-cta{display:flex;gap:16px;flex-wrap:wrap}
.hero-stats{display:flex;gap:0;margin-top:66px;border-top:1px solid var(--line);padding-top:30px}
.stat{padding-right:44px;margin-right:44px;border-right:1px solid var(--line)}
.stat:last-child{border:none;margin:0;padding:0}
.stat b{display:flex;align-items:baseline;font-size:38px;font-weight:800;letter-spacing:-.02em;font-variant-numeric:tabular-nums}
.stat b i{font-style:normal;color:var(--red);font-size:22px;margin-left:2px}
.stat span{font-size:13px;color:var(--gray)}

/* hero 右侧：箭头装置 */
.hero-art{position:relative;display:flex;align-items:center;justify-content:center}
.ring{position:absolute;border-radius:50%;border:1.5px solid var(--line)}
.ring.r1{width:460px;height:460px;animation:spin 28s linear infinite}
.ring.r2{width:340px;height:340px;border-style:dashed;border-color:rgba(228,51,43,.35);animation:spin 20s linear infinite reverse}
@keyframes spin{to{transform:rotate(360deg)}}
.ring .sat{position:absolute;top:-7px;left:50%;width:14px;height:14px;border-radius:50%;background:var(--red);box-shadow:0 0 0 5px rgba(228,51,43,.15)}
.tri-arrows{position:relative;z-index:2;filter:drop-shadow(0 24px 48px rgba(168,15,24,.25))}
.tri-arrows .a{transform-origin:center bottom;animation:rise 3.2s var(--ease) infinite}
.tri-arrows .a2{animation-delay:.25s}.tri-arrows .a3{animation-delay:.5s}
@keyframes rise{0%,100%{transform:translateY(0)}18%{transform:translateY(-14px)}}

/* ---------- 跑马灯 ---------- */
.marquee{background:var(--ink);color:#fff;padding:20px 0;overflow:hidden;white-space:nowrap;position:relative}
.marquee-track{display:inline-flex;gap:56px;animation:mq 26s linear infinite;padding-right:56px}
.marquee-track span{font-family:var(--mono);font-size:14px;letter-spacing:.3em;color:#D8D8DE;display:inline-flex;align-items:center;gap:56px}
.marquee-track span::after{content:"";width:8px;height:8px;background:var(--red);transform:rotate(45deg)}
@keyframes mq{to{transform:translateX(-50%)}}

/* ---------- 平台矩阵 ---------- */
.plat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px;margin-top:56px}
.plat{position:relative;border:1px solid var(--line);border-radius:22px;padding:34px 30px 30px;background:var(--paper);overflow:hidden;transition:transform .45s var(--ease),box-shadow .45s var(--ease),border-color .45s}
.plat:hover{transform:translateY(-8px);box-shadow:var(--shadow-lg);border-color:rgba(228,51,43,.35)}
.plat::before{content:"";position:absolute;top:0;left:0;right:0;height:4px;background:linear-gradient(90deg,var(--red),var(--red-hi));transform:scaleX(0);transform-origin:left;transition:transform .5s var(--ease)}
.plat:hover::before{transform:scaleX(1)}
.plat-no{font-family:var(--mono);font-size:12px;color:var(--gray);letter-spacing:.2em}
.plat h3{font-size:23px;font-weight:800;margin:14px 0 6px;letter-spacing:-.01em}
.plat .purl{font-family:var(--mono);font-size:12.5px;color:var(--red);margin-bottom:14px;display:block}
.plat p{font-size:14.5px;color:var(--gray-2);min-height:96px}
.plat-tags{display:flex;flex-wrap:wrap;gap:8px;margin:18px 0 22px}
.plat-tags i{font-style:normal;font-size:12px;color:var(--gray-2);background:var(--paper-2);border:1px solid var(--line);padding:4px 12px;border-radius:999px}
.plat-go{display:inline-flex;align-items:center;gap:8px;font-weight:700;font-size:14.5px;color:var(--red)}
.plat-go .cir{width:30px;height:30px;border-radius:50%;background:var(--red-soft);display:grid;place-items:center;transition:transform .35s var(--ease),background .35s,color .35s}
.plat:hover .plat-go .cir{background:var(--red);color:#fff;transform:translateX(6px)}
.plat-shot{margin:0 0 26px;border-radius:14px;border:1px solid var(--line);overflow:hidden;background:var(--ink);aspect-ratio:16/9.6;position:relative}
.plat-shot.dark2{background:linear-gradient(135deg,#181820,#0A0A0C)}

/* mockup 通用 */
.shot-bar{height:30px;display:flex;align-items:center;gap:6px;padding:0 12px;background:rgba(255,255,255,.06);border-bottom:1px solid rgba(255,255,255,.08)}
.shot-bar i{width:9px;height:9px;border-radius:50%;background:#3A3A44}
.shot-bar i:first-child{background:var(--red)}
.shot-url{margin-left:8px;flex:1;height:16px;border-radius:8px;background:rgba(255,255,255,.08);font-family:var(--mono);font-size:9px;color:#8A8A94;display:flex;align-items:center;padding:0 10px}
.shot-body{padding:14px;display:flex;gap:10px;height:calc(100% - 30px)}
.sk{border-radius:6px;background:linear-gradient(100deg,rgba(255,255,255,.10) 30%,rgba(255,255,255,.16) 50%,rgba(255,255,255,.10) 70%);background-size:200% 100%;animation:shimmer 2.4s linear infinite}
@keyframes shimmer{to{background-position:-200% 0}}
.sk-rd{background:linear-gradient(100deg,rgba(228,51,43,.75) 30%,rgba(255,74,61,.9) 50%,rgba(228,51,43,.75) 70%);background-size:200% 100%;animation:shimmer 2.4s linear infinite}

/* ---------- 业务能力 ---------- */
.cap-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-top:56px}
.cap{border:1px solid var(--line);border-radius:20px;padding:30px 28px;position:relative;overflow:hidden;transition:transform .4s var(--ease),box-shadow .4s var(--ease);background:var(--paper)}
.cap:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg)}
.cap .no{font-family:var(--mono);font-size:12px;color:var(--red);letter-spacing:.18em}
.cap h3{font-size:19px;font-weight:800;margin:12px 0 8px}
.cap p{font-size:13.8px;color:var(--gray-2)}
.cap .arw{position:absolute;right:22px;bottom:20px;width:34px;height:34px;border-radius:50%;border:1.5px solid var(--line);display:grid;place-items:center;color:var(--ink);transition:all .35s var(--ease)}
.cap:hover .arw{background:var(--red);border-color:var(--red);color:#fff;transform:rotate(-45deg)}

/* ---------- 案例（黑色区） ---------- */
.case-head{display:flex;align-items:flex-end;justify-content:space-between;gap:30px}
.case-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:22px;margin-top:54px}
.case{grid-column:span 3;border-radius:22px;overflow:hidden;position:relative;background:var(--ink-2);border:1px solid rgba(255,255,255,.08);min-height:380px;display:flex;flex-direction:column;transition:transform .45s var(--ease),border-color .45s}
.case:hover{transform:translateY(-8px);border-color:rgba(255,74,61,.5)}
.case.big{grid-column:span 3;min-height:460px}
.case.sm{grid-column:span 2;min-height:330px}
.case-img{flex:1;position:relative;overflow:hidden}
.case-img img,.case-img .mockup{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:transform .8s var(--ease)}
.case:hover .case-img img{transform:scale(1.06)}
.case-img::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,transparent 40%,rgba(10,10,12,.92))}
.case-txt{position:relative;z-index:2;padding:26px 28px 28px;margin-top:-90px}
.case-kind{display:inline-block;font-family:var(--mono);font-size:11px;letter-spacing:.22em;color:var(--red-hi);border:1px solid rgba(255,74,61,.4);padding:4px 12px;border-radius:999px;margin-bottom:12px;background:rgba(228,51,43,.12)}
.case h3{font-size:21px;font-weight:800;letter-spacing:-.01em}
.case p{font-size:13.5px;color:#B4B4BE;margin-top:8px}
.case .anon{font-size:11.5px;color:#7A7A84;margin-top:10px;display:inline-flex;align-items:center;gap:6px}
.case .anon::before{content:"";width:14px;height:1.5px;background:#7A7A84}

/* ---------- 流程 ---------- */
.flow{display:grid;grid-template-columns:repeat(4,1fr);gap:0;margin-top:60px;position:relative}
.flow::before{content:"";position:absolute;top:27px;left:6%;right:6%;height:2px;background:repeating-linear-gradient(90deg,var(--red) 0 10px,transparent 10px 20px);opacity:.5}
.step{position:relative;padding:0 26px;text-align:left}
.step .ball{width:54px;height:54px;border-radius:50%;background:var(--paper);border:2px solid var(--red);color:var(--red);font-family:var(--mono);font-weight:700;font-size:15px;display:grid;place-items:center;margin-bottom:20px;position:relative;z-index:2;transition:all .35s var(--ease)}
.step:hover .ball{background:var(--red);color:#fff;transform:translateY(-6px);box-shadow:0 14px 30px -10px rgba(228,51,43,.5)}
.step h3{font-size:17.5px;font-weight:800;margin-bottom:8px}
.step p{font-size:13.5px;color:var(--gray-2)}

/* ---------- 关于 ---------- */
.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:70px;align-items:center;margin-top:20px}
.about-copy p{font-size:15.5px;color:var(--gray-2);margin:18px 0}
.vmv{display:grid;gap:16px;margin-top:34px}
.vmv li{list-style:none;display:flex;gap:16px;align-items:flex-start;background:var(--paper-2);border:1px solid var(--line);border-radius:16px;padding:18px 20px;transition:transform .35s var(--ease),border-color .35s}
.vmv li:hover{transform:translateX(8px);border-color:rgba(228,51,43,.35)}
.vmv b{font-size:15px;display:block}
.vmv span{font-size:13.5px;color:var(--gray-2)}
.vmv .k{font-family:var(--mono);font-size:11px;color:var(--red);letter-spacing:.2em;padding-top:3px;min-width:74px}
.about-visual{position:relative;border-radius:26px;overflow:hidden;box-shadow:var(--shadow-lg);aspect-ratio:4/4.6}
.about-visual img{width:100%;height:100%;object-fit:cover}
.about-badge{position:absolute;left:22px;bottom:22px;background:rgba(10,10,12,.82);backdrop-filter:blur(10px);color:#fff;border-radius:16px;padding:16px 20px;display:flex;gap:14px;align-items:center}
.about-badge .dot{width:9px;height:9px;border-radius:50%;background:#3AD65A;box-shadow:0 0 0 5px rgba(58,214,90,.18);animation:pulse 2s infinite}
.about-badge small{display:block;font-family:var(--mono);font-size:10px;color:#9A9AA4;letter-spacing:.2em}
.about-badge b{font-size:14px}

/* ---------- 联系 CTA ---------- */
.cta{position:relative;background:linear-gradient(135deg,var(--red-deep),var(--red) 55%,var(--red-hi));color:#fff;border-radius:30px;padding:74px 70px;overflow:hidden}
.cta::before{content:"";position:absolute;right:-70px;top:-70px;width:320px;height:320px;border:2px solid rgba(255,255,255,.16);border-radius:50%}
.cta::after{content:"";position:absolute;right:-30px;top:-30px;width:240px;height:240px;border:2px solid rgba(255,255,255,.12);border-radius:50%}
.cta .eyebrow{color:rgba(255,255,255,.85)}
.cta .eyebrow::before{background:#fff}
.cta h2{font-size:clamp(30px,3.6vw,50px);font-weight:900;letter-spacing:-.02em;line-height:1.15;margin:14px 0 12px}
.cta .tel{display:inline-flex;align-items:center;gap:16px;font-size:clamp(26px,3vw,42px);font-weight:900;letter-spacing:.02em;margin:22px 0 8px;font-variant-numeric:tabular-nums}
.cta .tel svg{flex:none}
.cta p.cta-sub{color:rgba(255,255,255,.85);font-size:15px}
.cta-row{display:flex;gap:16px;margin-top:34px;flex-wrap:wrap;align-items:center}
.cta .btn-inv{background:#fff;color:var(--red);box-shadow:0 12px 30px -10px rgba(0,0,0,.35)}
.cta .btn-inv:hover{background:var(--ink);color:#fff}
.cta .addr{font-size:13.5px;color:rgba(255,255,255,.8)}

/* ---------- FOOTER ---------- */
footer{background:var(--ink);color:#9A9AA4;padding:70px 0 36px}
.ft-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:40px;padding-bottom:44px;border-bottom:1px solid rgba(255,255,255,.09)}
.ft-brand .brand{color:#fff;margin-bottom:16px}
.ft-brand p{font-size:13.5px;max-width:300px}
.ft h4{color:#fff;font-size:14px;font-weight:700;margin-bottom:16px;letter-spacing:.04em}
.ft a{display:block;font-size:13.5px;padding:5px 0;transition:color .25s}
.ft a:hover{color:var(--red-hi)}
.ft-base{display:flex;justify-content:space-between;align-items:center;gap:20px;padding-top:26px;font-size:12.5px;flex-wrap:wrap}
.ft-base .mono{font-family:var(--mono);letter-spacing:.14em}

/* 响应式兜底（窄桌面） */
@media (max-width:1100px){
  .hero-in{grid-template-columns:1fr;gap:40px}
  .hero-art{display:none}
  .plat-grid,.cap-grid{grid-template-columns:repeat(2,1fr)}
  .case.sm{grid-column:span 3}
  .flow{grid-template-columns:repeat(2,1fr);gap:36px}
  .flow::before{display:none}
  .about-grid{grid-template-columns:1fr;gap:44px}
  .ft-grid{grid-template-columns:1fr 1fr}
}