/* ============================================================
   arcticad.com 全站重排 v3 · 设计系统（壳）
   北极圈影视 = 专注 IVD/医疗器械的影视内容供应商（B2B）
   原则：白为底 + 黑白灰搭层次；紫青渐变只做强调（≤10%）；
         H1 只给定位句；圆角 12 + 1px 细描边；动效 ≤300ms 克制
   ============================================================ */
:root{
  --purple:#6B0DD4; --teal:#01C0B3;
  --grad:linear-gradient(135deg,#6B0DD4,#01C0B3);
  --ink:#1b1c20; --ink2:#4a4a52; --ink3:#6f747d;
  --bg-soft:#f6f7f9; --line:#e8eaee;
  --radius:14px;
  --font:'Noto Sans SC','PingFang SC','Microsoft YaHei',Arial,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:var(--font);color:var(--ink);background:#fff;font-size:15px;line-height:1.7}
a{text-decoration:none;color:inherit}
img{max-width:100%}
.wrap{max-width:1200px;margin:0 auto;padding:0 24px}

/* （演示稿内部说明：本地版已移除页面可见的“预览/未上线”提示；正式上线前请删除各页 <meta name=robots content=noindex,nofollow> 并核对标题关键词。内部待办统一见 上线前收尾清单.md） */

/* ---------- 壳 · 吸顶导航（全站 5 项） ---------- */
.hd{background:rgba(15,17,23,.92);backdrop-filter:blur(10px);border-bottom:1px solid rgba(255,255,255,.08);position:sticky;top:0;z-index:100}
.hd .wrap{display:flex;align-items:center;justify-content:space-between;height:72px}
.hd .logo{display:flex;align-items:center;gap:12px;font-size:15px;font-weight:500;letter-spacing:1px;color:#fff}
.hd .logo img{height:40px;width:auto;display:block}
.hd nav{display:flex;gap:34px}
.hd nav a{font-size:15px;color:rgba(255,255,255,.82);padding:6px 2px;position:relative;transition:color .2s;white-space:nowrap}
.hd nav a.cur,.hd nav a:hover{color:#fff}
.hd nav a::after{content:'';position:absolute;left:0;right:100%;bottom:0;height:2px;background:var(--grad);transition:right .25s}
.hd nav a:hover::after,.hd nav a.cur::after{right:0}
.hd .nav-cta{display:inline-block;padding:9px 22px;border-radius:40px;background:var(--grad);color:#fff;font-size:14px;letter-spacing:1px;transition:transform .2s,box-shadow .2s;white-space:nowrap}
.hd .nav-cta:hover{transform:translateY(-1px);box-shadow:0 8px 20px rgba(107,13,212,.3)}
.hd .nav-cta.cur{background:#fff;color:var(--purple);box-shadow:inset 0 0 0 1.5px var(--purple)}

/* ---------- 首页 · 首屏 ---------- */
.banner{position:relative;height:86vh;min-height:560px;overflow:hidden;display:flex;align-items:center;justify-content:center}
.banner video,.banner .bg{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.banner .mask{position:absolute;inset:0;background:linear-gradient(180deg,rgba(10,12,16,.5),rgba(10,12,16,.32) 55%,rgba(10,12,16,.6))}
.banner .inner{position:relative;z-index:2;text-align:center;color:#fff;padding:0 20px;max-width:1000px}
.banner h1{font-size:34px;font-weight:500;letter-spacing:2px;margin:0 0 16px;text-shadow:0 2px 18px rgba(0,0,0,.3)}
.banner p.sub{font-size:15px;letter-spacing:4px;color:rgba(255,255,255,.88);margin:0 0 36px}
.banner .btns{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}
.btn-grad{display:inline-block;padding:14px 42px;border-radius:40px;background:var(--grad);color:#fff;font-size:15px;letter-spacing:2px;box-shadow:0 8px 24px rgba(107,13,212,.35);transition:transform .2s,box-shadow .2s}
.btn-grad:hover{transform:translateY(-2px);box-shadow:0 12px 30px rgba(1,192,179,.4)}
.btn-ghost{display:inline-block;padding:13px 40px;border-radius:40px;border:1px solid rgba(255,255,255,.65);color:#fff;font-size:15px;letter-spacing:2px;transition:border-color .2s,background .2s}
.btn-ghost:hover{border-color:#fff;background:rgba(255,255,255,.12)}
/* 首屏不放联系电话：询盘入口统一为 CTA → 联系页/页脚 */
.banner .down{position:absolute;bottom:26px;left:50%;transform:translateX(-50%);z-index:2;color:rgba(255,255,255,.8);font-size:12px;letter-spacing:2px;text-align:center}
.banner .down svg{display:block;margin:0 auto 6px;animation:bob 1.8s ease-in-out infinite}
@keyframes bob{0%,100%{transform:translateY(0)}50%{transform:translateY(6px)}}

/* ---------- 板块通用 ---------- */
.sec{padding:88px 0}
.sec.alt{background:var(--bg-soft)}
.sec-head{text-align:center;margin-bottom:52px}
.sec-head .eyebrow{display:inline-block;font-size:12px;letter-spacing:3px;color:var(--teal);margin-bottom:10px;font-weight:500}
.sec-head h2{font-size:30px;font-weight:500;margin:0 0 12px;letter-spacing:2px}
.sec-head h2 em{font-style:normal;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.sec-head p{color:var(--ink3);font-size:15px;margin:0;letter-spacing:.5px}
.grad-bar{width:56px;height:4px;border-radius:2px;background:var(--grad);margin:20px auto 0}

/* ---------- 信任条（纯数字条；客户证据由下方客户墙承接） ---------- */
.trust{background:#fff;border-bottom:1px solid var(--line);padding:46px 0}
.trust .wrap{display:flex;justify-content:center}
.trust .stats{display:flex;gap:80px;flex-wrap:wrap;justify-content:center}
.stat{text-align:center}
.stat b{display:block;font-size:28px;font-weight:600;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.stat>i{display:block;font-style:normal;font-size:12.5px;color:var(--ink2);letter-spacing:1px;margin-top:8px}
.stat b i{font-style:normal;font-size:16px}

/* ---------- 案例卡片（首页 + 作品页：16:9 全图可见，文案在图下） ---------- */
.types{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.tcard{display:block;background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:transform .28s,box-shadow .28s,border-color .28s}
.tcard:hover{transform:translateY(-4px);box-shadow:0 16px 34px rgba(107,13,212,.10);border-color:#dcccf6}
.tcard .cv{position:relative;display:block;aspect-ratio:16/9;overflow:hidden;background:#000}
.tcard .cv img{width:100%;height:100%;object-fit:cover;transition:transform .5s}
.tcard:hover .cv img{transform:scale(1.05)}
.tcard .cp{display:flex;flex-direction:column;gap:6px;padding:16px 18px 18px;border-top:1px solid var(--line);background:#fff}
.tcard .cp b{font-size:17px;font-weight:600;color:#1c1e26;letter-spacing:.5px}
.tcard .cp span{font-size:12.5px;color:var(--ink2);line-height:1.65;min-height:2.6em}
.tcard .go{margin-top:2px;font-size:12px;color:var(--purple);letter-spacing:1px;font-style:normal}
.tcard .go::after{content:' →'}
.more-line{text-align:center;margin-top:46px}
.works-note{max-width:900px;margin:40px auto 0;text-align:center;font-size:13px;color:var(--ink3);line-height:1.8}
.more-line a{display:inline-block;padding:12px 46px;border-radius:40px;border:1px solid #d9dbe2;color:var(--ink2);font-size:14px;letter-spacing:2px;transition:all .25s}
.more-line a:hover{border-color:var(--purple);color:var(--purple)}

/* 作品页案例卡：16:9 全图 + 图下说明 */
.wgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.wcard{display:block;background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:transform .28s,box-shadow .28s,border-color .28s}
.wcard:hover{transform:translateY(-4px);box-shadow:0 16px 34px rgba(107,13,212,.10);border-color:#dcccf6}
.wcard .cv{position:relative;display:block;aspect-ratio:16/9;overflow:hidden;background:#000}
.wcard .cv img{width:100%;height:100%;object-fit:cover;transition:transform .5s}
.wcard:hover .cv img{transform:scale(1.05)}
.wcard .cp{display:flex;flex-direction:column;gap:5px;padding:16px 18px 18px;border-top:1px solid var(--line);background:#fff}
.wcard .cp .tag{align-self:flex-start;font-size:11px;letter-spacing:1px;color:#fff;background:var(--grad);padding:3px 12px;border-radius:20px;margin-bottom:3px}
.wcard .cp b{font-size:16.5px;font-weight:600;color:#1c1e26;letter-spacing:.5px}
.wcard .cp span:not(.tag){font-size:12.5px;color:var(--ink2);line-height:1.65;min-height:2.6em}
.wcard .cv.tplg{display:flex;align-items:center;justify-content:center;background:var(--grad)}
.wcard .cv.tplg .ph-play{color:rgba(255,255,255,.94);font-size:13px;letter-spacing:2px;padding:11px 24px;border:1px solid rgba(255,255,255,.65);border-radius:40px}

/* ---------- 服务体系 ---------- */
.svc{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.scard{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px 24px;transition:all .25s;position:relative;overflow:hidden}
.scard::before{content:'';position:absolute;top:0;left:0;right:0;height:3px;background:var(--grad);opacity:0;transition:opacity .25s}
.scard:hover{transform:translateY(-4px);box-shadow:0 14px 34px rgba(34,34,34,.08);border-color:transparent}
.scard:hover::before{opacity:1}
.scard .ico{width:46px;height:46px;border-radius:12px;background:var(--grad);display:flex;align-items:center;justify-content:center;margin-bottom:18px}
.scard .ico svg{width:22px;height:22px;fill:none;stroke:#fff;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}
.scard b{display:block;font-size:17px;font-weight:500;margin-bottom:10px}
.scard p{margin:0;font-size:13px;color:var(--ink3);line-height:1.8}

/* ---------- 为什么选 ---------- */
.why{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.whycard{background:#fff;border-radius:var(--radius);padding:34px 28px;border:1px solid var(--line)}
.whycard .num{font-size:13px;color:var(--teal);letter-spacing:2px;font-weight:500;margin-bottom:14px}
.whycard b{display:block;font-size:19px;font-weight:500;margin-bottom:12px}
.whycard p{margin:0;color:var(--ink3);font-size:14px;line-height:1.9}

/* ---------- 合作流程 ---------- */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:0;position:relative}
.step{padding:0 26px;text-align:center;position:relative}
.step:not(:last-child)::after{content:'';position:absolute;top:24px;right:-14px;width:28px;height:2px;background:linear-gradient(90deg,#c9b6f0,#a8e9e3)}
.step .n{width:48px;height:48px;border-radius:50%;background:#fff;border:2px solid #d9dbe2;display:flex;align-items:center;justify-content:center;margin:0 auto 16px;font-weight:600;color:var(--ink2);position:relative;z-index:1}
.step b{display:block;font-size:16px;font-weight:500;margin-bottom:8px}
.step p{margin:0;font-size:13px;color:var(--ink3);line-height:1.7}

/* ---------- 客户墙 ---------- */
.chips{display:flex;flex-wrap:wrap;gap:12px;justify-content:center;max-width:1080px;margin:0 auto}
.chip{display:inline-block;padding:10px 20px;border:1px solid var(--line);border-radius:40px;background:#fff;color:#4a4a52;font-size:14px;letter-spacing:.5px;transition:all .2s}
.chip:hover{border-color:var(--purple);color:var(--purple);box-shadow:0 6px 16px rgba(107,13,212,.12);transform:translateY(-2px)}
/* 客户 LOGO 墙（图+名，直接引用官网客户栏目 logo 图） */
.lg-grid{display:flex;flex-wrap:wrap;justify-content:center;gap:14px;max-width:1120px;margin:0 auto}
.lg-grid > .lg{flex:0 0 auto;width:170px}
.lg{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;background:#fff;border:1px solid var(--line);border-radius:14px;padding:22px 12px 16px;text-align:center;transition:all .25s;min-height:104px}
.lg img{max-width:82%;max-height:32px;object-fit:contain;transition:transform .25s;display:block}
.lg span{font-size:12px;color:#8b8f98;letter-spacing:.5px;line-height:1.35;white-space:nowrap}
.lg:hover{border-color:var(--purple);box-shadow:0 10px 24px rgba(107,13,212,.13);transform:translateY(-3px)}
.lg:hover img{transform:scale(1.05)}
.lg:hover span{color:var(--purple)}
.lg-grid-top{max-width:1000px;display:grid;grid-template-columns:repeat(4,1fr)}
.lg-grid-top > .lg{width:auto}
.multi .lg-grid{display:flex;flex-wrap:wrap;justify-content:flex-start;gap:12px;margin-top:4px}
.multi .lg{flex-direction:row;justify-content:flex-start;gap:14px;min-height:0;padding:13px 16px;width:auto;flex:0 0 auto}
.multi .lg img{max-height:26px;max-width:120px;flex:none}
.multi .lg span{white-space:nowrap}
.multi{max-width:1080px;margin:52px auto 0;border:1px solid var(--line);border-radius:16px;background:#fbfbfd;overflow:hidden}
.multi summary{list-style:none;cursor:pointer;padding:20px 28px;display:flex;align-items:center;justify-content:space-between;gap:18px;color:var(--ink2);font-size:14px;line-height:1.7;letter-spacing:.5px;user-select:none}
.multi summary::-webkit-details-marker{display:none}
.multi summary .ttl b{color:var(--ink);font-weight:500}
.multi summary .arrow{transition:transform .25s;color:var(--purple);font-size:16px;flex:none}
.multi[open] summary .arrow{transform:rotate(180deg)}
.multi summary:hover{background:#f4f5f8}
.multi .body{padding:8px 28px 30px;border-top:1px dashed var(--line)}
.multi .desc{color:var(--ink3);font-size:13px;line-height:1.9;margin:16px 0 20px;text-align:left}
.multi .chips{justify-content:flex-start;gap:10px}
.multi .chips .chip{font-size:13px;padding:7px 16px}

/* ---------- 转化 CTA ---------- */
.cta{background:linear-gradient(135deg,#5710a6,#00a293);padding:86px 0;text-align:center;color:#fff}
.cta h2{font-size:32px;font-weight:500;margin:0 0 14px;letter-spacing:2px}
.cta p{color:rgba(255,255,255,.88);margin:0 0 36px;letter-spacing:1px;font-size:15px}
.cta .btn-white{display:inline-block;background:#fff;color:var(--purple);font-weight:500;padding:15px 54px;border-radius:40px;font-size:16px;letter-spacing:2px;box-shadow:0 10px 26px rgba(0,0,0,.18);transition:transform .2s}
.cta .btn-white:hover{transform:translateY(-2px)}

/* 常驻浮动报价按钮（全站每页右下角） */
.fab{position:fixed;right:26px;bottom:30px;z-index:200;background:var(--grad);color:#fff;font-size:14px;letter-spacing:1px;padding:14px 28px;border-radius:40px;box-shadow:0 10px 26px rgba(107,13,212,.4);transition:transform .2s,box-shadow .2s}
.fab:hover{transform:translateY(-2px);box-shadow:0 14px 32px rgba(1,192,179,.45)}

/* ---------- 二级页 hero（案例库 / 关于 / 合作指南等共用） ---------- */
.page-hero{background:#fff;padding:72px 0 54px;text-align:center;border-bottom:1px solid var(--line)}
.page-hero .crumb{font-size:12px;color:var(--ink3);letter-spacing:1px;margin-bottom:18px}
.page-hero .crumb a:hover{color:var(--purple)}
.page-hero .eyebrow{display:inline-block;font-size:12px;letter-spacing:3px;color:var(--teal);margin-bottom:12px;font-weight:500}
.page-hero h1{font-size:33px;font-weight:500;margin:0 0 12px;letter-spacing:2px}
.page-hero h1 em{font-style:normal;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.page-hero p{color:var(--ink3);font-size:15px;margin:0;letter-spacing:.5px;max-width:720px;margin-left:auto;margin-right:auto}
.page-hero .grad-bar{margin:22px auto 0}

/* 案例解读卡（无剧照，用渐变封面）样式见 .wcard .cv.tplg */
/* 作品库筛选（演示用前端过滤；上线由 CMS 分类驱动） */
.filters{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-bottom:44px}
.fbtn{border:1px solid var(--line);border-radius:40px;padding:9px 22px;font-size:13px;letter-spacing:.5px;cursor:pointer;background:#fff;color:var(--ink2);transition:all .2s;font-family:inherit}
.fbtn:hover{border-color:var(--purple);color:var(--purple)}
.fbtn.on{background:var(--grad);color:#fff;border-color:transparent}
.wcard.hide{display:none}

/* ---------- 案例详情页 ---------- */
.video-wrap{padding:44px 0 0}
.video-frame video{width:100%;height:100%;display:block;object-fit:contain}
.vnote{text-align:center;font-size:13px;color:var(--ink3);margin:16px 0 0;letter-spacing:.5px}
.vnote a{color:var(--purple)}
.case-hero{background:#0b0d12;color:#fff;padding:64px 0 48px}
.case-hero .wrap{display:flex;flex-direction:column;gap:26px}
.case-hero .back{font-size:13px;color:rgba(255,255,255,.7);letter-spacing:1px;display:inline-block;width:fit-content}
.case-hero .back:hover{color:#5ee6da}
.case-hero .tt{display:flex;justify-content:space-between;align-items:flex-end;gap:24px;flex-wrap:wrap}
.case-hero h1{font-size:28px;font-weight:500;margin:0 0 10px;letter-spacing:1px}
.case-hero .sub{color:rgba(255,255,255,.75);font-size:14px;margin:0}
.case-hero .play{display:inline-flex;align-items:center;gap:10px;padding:12px 30px;border-radius:40px;background:var(--grad);color:#fff;font-size:14px;letter-spacing:1px;transition:transform .2s;flex:none}
.case-hero .play:hover{transform:translateY(-2px)}
.video-frame{position:relative;width:100%;aspect-ratio:16/9;border-radius:var(--radius);overflow:hidden;background:#000}
.video-frame video{width:100%;height:100%;display:block;object-fit:contain}
.video-frame .poster{position:absolute;inset:0;background:radial-gradient(1200px 500px at 50% 0%,#2a2440 0%,#0b0d12 62%);display:flex;align-items:center;justify-content:center}
.video-frame .poster .pb{width:86px;height:86px;border-radius:50%;background:rgba(107,13,212,.9);display:flex;align-items:center;justify-content:center;cursor:pointer;transition:transform .2s;border:2px solid rgba(255,255,255,.85)}
.video-frame .poster .pb:hover{transform:scale(1.06)}
.case-layout{padding:64px 0 0}
.case-layout .wrap{display:grid;grid-template-columns:300px 1fr;gap:40px;align-items:start}
.meta{position:sticky;top:130px;display:flex;flex-direction:column;gap:14px}
.meta .mcard{border:1px solid var(--line);border-radius:var(--radius);padding:20px 22px;background:#fff}
.meta .mcard h4{margin:0 0 4px;font-size:12px;font-weight:500;color:var(--ink3);letter-spacing:1px}
.meta .mcard p{margin:0;font-size:15px;color:var(--ink)}
.meta .tags{display:flex;flex-wrap:wrap;gap:8px}
.meta .tags span{font-size:12px;padding:5px 14px;border-radius:30px;background:var(--bg-soft);color:var(--ink2);border:1px solid var(--line)}
.meta .cta-box{background:var(--bg-soft);border:1px solid var(--line);border-radius:var(--radius);padding:22px;text-align:center}
.meta .cta-box p{font-size:13px;color:var(--ink2);margin:0 0 16px;line-height:1.8}
.meta .cta-box .btn-grad{font-size:14px;padding:11px 26px}
.narr h2{font-size:24px;font-weight:500;letter-spacing:1px;margin:0 0 8px}
.narr .bar{width:44px;height:3px;background:var(--grad);border-radius:2px;margin-bottom:26px}
.narr h3{font-size:19px;font-weight:500;margin:44px 0 0;letter-spacing:1px;display:flex;align-items:center;gap:12px}
.narr h3 .no{width:30px;height:30px;border-radius:50%;background:var(--grad);color:#fff;font-size:14px;display:inline-flex;align-items:center;justify-content:center;flex:none}
.narr p{color:#3d3f45;font-size:15px;line-height:2;margin:14px 0 0}
.narr ul{margin:14px 0 0;padding-left:4px;list-style:none}
.narr ul li{position:relative;padding-left:20px;color:#3d3f45;font-size:15px;line-height:2}
.narr ul li::before{content:'';position:absolute;left:0;top:14px;width:7px;height:7px;border-radius:50%;background:var(--grad)}
.case-nav .wrap{display:flex;justify-content:space-between;gap:20px;border-top:1px solid var(--line);padding:34px 0 60px}
.case-nav a{font-size:14px;color:var(--ink2);letter-spacing:.5px}
.case-nav a b{color:var(--ink);font-weight:500;display:block;margin-bottom:4px;font-size:13px;color:var(--ink3)}
.case-nav a:hover span{color:var(--purple)}

/* ---------- 壳 · 页脚（全站一致） ---------- */
.ft{background:#1b1c20;color:#9aa0a8;padding:54px 0 34px}
.ft .wrap{display:flex;flex-direction:column;gap:26px}
.ft .cols{display:grid;grid-template-columns:1.6fr 1fr 1fr;gap:40px}
.ft .cols h5{margin:0 0 14px;color:#cfd3d9;font-size:14px;font-weight:500;letter-spacing:1px}
.ft .cols p,.ft .cols a{display:block;font-size:13px;line-height:2.1;color:#9aa0a8}
.ft .cols a:hover{color:#fff}
.ft .icons{display:flex;gap:14px;margin-top:8px}
.ft .icons a{width:38px;height:38px;border:1px solid #33353c;border-radius:50%;display:flex;align-items:center;justify-content:center;transition:border-color .2s}
.ft .icons a:hover{border-color:var(--teal)}
.ft .icons a:hover svg{fill:#5ee6da}
.ft .icons svg{width:17px;height:17px;fill:#9aa0a8}
.ft .cp{border-top:1px solid #2a2c33;padding-top:24px;font-size:12px;color:#6b7079}
.ft .cp a{color:#6b7079}
.ft .cp a:hover{color:#fff}

/* ---------- 焦点可见性（可访问性） ---------- */
.tcard:focus-visible,.wcard:focus-visible,.lg:focus-visible,.more-line a:focus-visible{outline:2px solid var(--purple);outline-offset:3px}

/* ---------- 响应式 ---------- */
@media (max-width:991px){
  .hd nav{gap:14px}.hd nav a{font-size:13px}.hd .nav-cta{padding:8px 16px;font-size:13px}
  .types{grid-template-columns:repeat(2,1fr)}
  .wgrid{grid-template-columns:repeat(2,1fr)}
  .svc{grid-template-columns:repeat(2,1fr)}
  .why{grid-template-columns:1fr}
  .steps{grid-template-columns:repeat(2,1fr);row-gap:34px}
  .step:nth-child(2)::after{display:none}
  .trust .wrap{flex-direction:column}
  .banner h1{font-size:24px}.sec-head h2{font-size:25px}.page-hero h1{font-size:27px}
  .case-layout{grid-template-columns:1fr;gap:40px}
  .meta{position:static}
  .ft .cols{grid-template-columns:1fr;gap:26px}
}
@media (max-width:575px){
  .types,.wgrid,.svc{grid-template-columns:1fr}
  .hd nav{display:none}
  .steps{grid-template-columns:1fr}
  .step:not(:last-child)::after{display:none}
}

/* ============================================================
   v3.1 补丁：汉堡导航 + 关于 / 合作指南 / 联系页组件
   ============================================================ */

/* ---------- 汉堡菜单（checkbox 方案，无需 JS） ---------- */
.navTog{display:none}
.burger{display:none}
@media (max-width:991px){
  .hd .wrap{position:relative;gap:12px}
  .hd nav{display:none;position:absolute;top:100%;left:0;right:0;background:#14171e;flex-direction:column;gap:0;padding:4px 24px 12px;border-bottom:1px solid rgba(255,255,255,.08);box-shadow:0 22px 34px rgba(0,0,0,.35);z-index:120}
  .hd nav a{padding:15px 2px;font-size:15px;color:rgba(255,255,255,.86);border-bottom:1px dashed rgba(255,255,255,.1);white-space:normal}
  .hd nav a:last-child{border-bottom:none}
  .hd nav a::after{display:none}
  .hd nav a.cur{color:#5ee6da}
  .hd nav a.cur::after{display:none}
  .navTog:checked ~ nav{display:flex}
  .burger{display:flex;flex-direction:column;gap:5px;width:44px;height:44px;align-items:center;justify-content:center;cursor:pointer;border:1px solid rgba(255,255,255,.3);border-radius:12px;background:rgba(255,255,255,.06);flex:none}
  .burger span{width:20px;height:2px;background:#fff;border-radius:2px;transition:transform .25s,opacity .25s;display:block}
  .navTog:checked ~ .burger span:nth-child(1){transform:translateY(7px) rotate(45deg)}
  .navTog:checked ~ .burger span:nth-child(2){opacity:0}
  .navTog:checked ~ .burger span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
  .hd .logo{font-size:14px}
}
@media (max-width:575px){
  .hd .logo img{height:30px}
  .hd .nav-cta{padding:9px 16px;font-size:13px}
}

/* ---------- 关于页 ---------- */
.grid2{display:grid;grid-template-columns:1.06fr .94fr;gap:48px;align-items:center}
.about-story h2,.about-story h3{font-size:24px;font-weight:500;letter-spacing:1px;margin:0 0 16px;line-height:1.55}
.about-story h2 em,.about-story h3 em{font-style:normal;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.about-story .lead{font-size:16.5px;line-height:2.05;color:var(--ink);margin:0 0 14px}
.about-story p{color:#3d3f45;font-size:15px;line-height:2.1;margin:0 0 12px}
.about-story ul.rules{margin:12px 0 0;padding:0;list-style:none}
.about-story ul.rules li{position:relative;padding-left:18px;font-size:15px;line-height:2.05;color:#3d3f45;margin:0 0 6px}
.about-story ul.rules li::before{content:'';position:absolute;left:0;top:12px;width:7px;height:7px;border-radius:50%;background:var(--grad)}
.kv{border-top:1px solid var(--line);padding-top:24px;margin-top:26px;display:grid;grid-template-columns:repeat(4,1fr);gap:18px 30px}
.kv div{display:flex;flex-direction:column;gap:2px}
.kv b{font-size:24px;font-weight:600;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.kv span{font-size:12px;color:var(--ink3);letter-spacing:1px}
.ph{aspect-ratio:4/3;border:2px dashed #d8dae1;border-radius:16px;background:#fbfbfd;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;color:var(--ink3);font-size:12px;text-align:center;padding:24px;letter-spacing:.5px;line-height:1.9}
.ph.photo{border:none;background:#f4f5f8;padding:0;overflow:hidden}
.ph.photo img{width:100%;height:100%;object-fit:contain;background:#fff}
.ph.sq.photo{background:#eef0f5}
.ph .badge{width:48px;height:48px;border-radius:50%;background:#fff;border:1px solid var(--line);display:flex;align-items:center;justify-content:center;margin-bottom:2px}
.ph .badge svg{width:20px;height:20px;fill:none;stroke:#b9bcc6;stroke-width:1.5;stroke-linecap:round;stroke-linejoin:round}
.ph b{color:var(--ink2);font-weight:500;font-size:14px;letter-spacing:1px}
.ph.sq{aspect-ratio:1/1}
.grid2 > .ph{justify-self:center;max-width:480px}
.grid2 > .ph.sq{max-width:400px}
/* 作品墙（真实案例封面拼墙，替代公司实拍背景墙占位） */
.wallcard{background:linear-gradient(155deg,#13151d 0%,#1c2130 52%,#291c3c 100%);border-radius:18px;padding:18px;box-shadow:0 20px 46px rgba(18,14,48,.16);display:flex;flex-direction:column;align-self:stretch;justify-self:stretch}
.wall-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:13px;padding:0 2px}
.wall-top b{color:#fff;font-size:15px;font-weight:500;letter-spacing:1px;display:flex;align-items:center;gap:8px}
.wall-top b::before{content:'';width:4px;height:15px;border-radius:2px;background:linear-gradient(180deg,#6B0DD4,#01C0B3)}
.wall-top span{color:rgba(255,255,255,.45);font-size:10px;letter-spacing:2.5px}
.wall-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:9px}
.wcell{position:relative;display:block;border-radius:9px;overflow:hidden;aspect-ratio:16/10;background:#000;text-decoration:none}
.wcell img{width:100%;height:100%;object-fit:cover;display:block;transition:transform .45s ease}
.wcell:hover img{transform:scale(1.07)}
.wcell::after{content:'';position:absolute;left:0;right:0;bottom:0;height:60%;background:linear-gradient(transparent,rgba(0,0,0,.85));pointer-events:none}
.wcell .ply{position:absolute;z-index:1;top:50%;left:50%;transform:translate(-50%,-50%);width:32px;height:32px;border-radius:50%;background:rgba(255,255,255,.24);border:1px solid rgba(255,255,255,.5);display:flex;align-items:center;justify-content:center;backdrop-filter:blur(2px);transition:background .25s}
.wcell .ply svg{width:11px;height:11px;margin-left:2px}
.wcell:hover .ply{background:rgba(107,13,212,.75);border-color:transparent}
.wcell i{position:absolute;z-index:1;left:10px;right:10px;bottom:7px;font-style:normal;color:#fff;font-size:11px;letter-spacing:.4px;line-height:1.5;text-shadow:0 1px 3px rgba(0,0,0,.6);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.wall-foot{margin-top:12px;color:rgba(255,255,255,.5);font-size:11px;letter-spacing:.5px;line-height:1.8;padding:0 2px}
.wall-foot a{color:#9fe8e2;text-decoration:none;border-bottom:1px solid rgba(159,232,226,.4)}
.wall-foot a:hover{color:#01C0B3}
.trait-list{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;max-width:940px;margin:0 auto}
.trait{padding:12px 24px;border:1px solid var(--line);border-radius:40px;background:#fff;font-size:14px;color:var(--ink2);letter-spacing:1px;display:flex;align-items:center;gap:10px}
.trait i{width:7px;height:7px;border-radius:50%;background:var(--grad);flex:none}
.trait b{font-weight:500;color:var(--ink)}

/* ---------- 合作指南 · FAQ ---------- */
.faq{max-width:840px;margin:0 auto;display:flex;flex-direction:column;gap:12px}
.faq details{border:1px solid var(--line);border-radius:14px;background:#fff;overflow:hidden;transition:border-color .2s}
.faq details[open]{border-color:#cfc3ee}
.faq summary{list-style:none;cursor:pointer;padding:19px 24px;display:flex;align-items:center;justify-content:space-between;gap:16px;user-select:none;font-size:15px;color:var(--ink);letter-spacing:.5px}
.faq summary::-webkit-details-marker{display:none}
.faq summary:hover{background:#fafafc}
.faq summary .ar{color:var(--purple);font-size:14px;transition:transform .25s;flex:none}
.faq details[open] summary .ar{transform:rotate(180deg)}
.faq .a{padding:4px 24px 22px;color:var(--ink2);font-size:14px;line-height:2.05}
.faq .a b{color:var(--ink);font-weight:500}

/* ---------- 联系页 · 表单 ---------- */
.form-card{max-width:760px;margin:0 auto;background:#fff;border:1px solid var(--line);border-radius:18px;padding:44px 46px;box-shadow:0 16px 44px rgba(30,30,38,.05)}
.frow{display:grid;grid-template-columns:1fr 1fr;gap:28px 22px}
.fitem{display:flex;flex-direction:column;gap:7px;margin-bottom:0}
.fitem.full{grid-column:1/-1}
.fitem label{font-size:13px;color:var(--ink2);letter-spacing:.5px}
.fitem label em{font-style:normal;color:#e5484d;margin-left:2px}
.fitem input,.fitem select,.fitem textarea{border:1px solid #d9dbe2;border-radius:10px;padding:12px 14px;font-size:14px;font-family:inherit;outline:none;transition:border-color .2s,box-shadow .2s;background:#fff;color:var(--ink)}
.fitem input:focus,.fitem select:focus,.fitem textarea:focus{border-color:var(--purple);box-shadow:0 0 0 3px rgba(107,13,212,.08)}
.fitem textarea{min-height:110px;resize:vertical;line-height:1.8}
.form-note{margin:22px 0 0;font-size:12px;color:var(--ink3);line-height:1.9;text-align:center;letter-spacing:.5px}
.contact-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.contact-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px 26px;text-align:center}
.contact-card .ico{width:48px;height:48px;border-radius:14px;background:var(--grad);display:flex;align-items:center;justify-content:center;margin:0 auto 16px}
.contact-card .ico svg{width:22px;height:22px;fill:none;stroke:#fff;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}
.contact-card b{display:block;font-size:16px;font-weight:500;margin-bottom:6px}
.contact-card span{font-size:13px;color:var(--ink3);line-height:1.9;display:block;letter-spacing:.5px}
.qr-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;max-width:1000px;margin:0 auto}
.qr-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px 18px;text-align:center}
.qr-card img{width:100%;max-width:180px;aspect-ratio:1/1;object-fit:contain;border-radius:10px;margin:0 auto 14px;display:block}
.qr-card b{display:block;font-size:15px;font-weight:500;margin-bottom:4px}
.qr-card span{font-size:12px;color:var(--ink3);letter-spacing:.5px}

/* 补丁 · 通用 */
@media (max-width:991px){
  .grid2{grid-template-columns:1fr;gap:34px}
  .kv{grid-template-columns:repeat(2,1fr);gap:20px}
  .contact-grid{grid-template-columns:1fr}
  .qr-grid{grid-template-columns:repeat(2,1fr)}
  .frow{grid-template-columns:1fr}
  .form-card{padding:32px 26px}
}
@media (max-width:575px){
  .kv b{font-size:20px}
  .banner .btns{flex-direction:column;align-items:stretch}
  .banner .btns a{width:100%;text-align:center}
  .lg-grid > .lg{width:calc(50% - 7px)}
  .filters{justify-content:flex-start}
}

/* ============================================================
   案例详情页（CMS works_content 模板 · v3 壳）2026-09-09
   设计：16:9 播放器 + 作品信息 + 同客户相关作品网格
   ============================================================ */
.dcr{font-size:12.5px;color:var(--ink3);letter-spacing:1px;margin:0 0 24px;display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.dcr a:hover{color:var(--purple)}
.dcr .sep{color:#c6cad2}
.vstage{position:relative;border-radius:var(--radius);overflow:hidden;background:#000;border:1px solid var(--line);box-shadow:0 18px 44px rgba(22,20,34,.13);margin:0 0 30px}
.vstage video,.vstage .vposter{display:block;width:100%;aspect-ratio:16/9;object-fit:contain;background:#000}
.whead{max-width:920px;margin:0 auto;padding:6px 2px 0}
.whead .pills{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:16px}
.pill{display:inline-block;font-size:11.5px;letter-spacing:1px;color:#fff;background:var(--grad);padding:4px 15px;border-radius:20px;white-space:nowrap}
.pill.o{background:transparent;color:var(--ink2);border:1px solid var(--line)}
.whead h1{font-size:clamp(21px,3.2vw,31px);font-weight:600;letter-spacing:.5px;margin:0 0 14px;color:#1c1e26;line-height:1.42}
.wdesc{font-size:15px;color:var(--ink2);line-height:1.95}
.wdesc p{margin:0 0 10px}
.wdesc p:last-child{margin-bottom:0}
.wact{display:flex;gap:14px;flex-wrap:wrap;margin-top:24px}
.btn-o{display:inline-block;padding:11px 32px;border-radius:40px;border:1px solid var(--purple);color:var(--purple);font-size:14px;letter-spacing:1px;transition:all .25s;background:#fff}
.btn-o:hover{background:var(--purple);color:#fff}
.rel-head{display:flex;align-items:baseline;justify-content:space-between;gap:16px;margin:66px 0 26px;flex-wrap:wrap}
.rel-head h2{font-size:22px;font-weight:600;letter-spacing:1px;margin:0;display:flex;align-items:center;gap:13px;color:#1c1e26}
.rel-head h2::before{content:'';width:4px;height:19px;border-radius:2px;background:var(--grad)}
.rel-head span{font-size:13px;color:var(--ink3)}
@media (max-width:640px){
  .whead{padding:6px 0 0}
  .rel-head h2{font-size:19px}
  .rel-head h2::before{height:17px}
}