/* ===== VEXRATECH v4 设计系统（0714）=====
   叠加于 style.css。核心：全页面满屏融合式 Hero（产品/底图/文字无边界）、
   ROG式双语大标题、滚动进场动画、竞速动画、参数表、占位图框架。
   用法：<body class="v4"> + 每页 .xhero 设 --hbg 背景变量 */

/* —— 导航：深色毛玻璃（全站统一）—— */
.v4 header#top{position:sticky;top:0;z-index:50;background:rgba(11,21,36,.6);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid rgba(255,255,255,.08)}
.v4 .nav{height:64px}
.v4 header#top nav a{color:#dce5f2;font-size:clamp(13px,1.4vw,15.5px);margin:0 12px;position:relative;padding:6px 2px;transition:color .15s}
.v4 header#top nav a:hover{color:#7fb0ff;text-shadow:0 0 14px rgba(127,176,255,.55)}
/* 当前页指示：橙色文字 + 底部光条 */
.v4 header#top nav a.on{color:#ffb45e;font-weight:800}
.v4 header#top nav a.on:after{content:"";position:absolute;left:0;right:0;bottom:-3px;height:3px;border-radius:3px;background:linear-gradient(90deg,#f3922e,#ffb45e);box-shadow:0 0 10px rgba(243,146,46,.55)}
/* 中英切换 */
.langsw{display:inline-flex;align-items:center;gap:6px;margin-left:10px;border:1px solid rgba(255,255,255,.25);border-radius:20px;padding:6px 12px;color:#dce5f2;font-size:13px;font-weight:700;white-space:nowrap}
.langsw:hover{border-color:#7fb0ff;color:#fff}
.langsw b{color:#ffb45e}
@media(max-width:900px){.langsw{display:none}}
.v4 .brandlock{display:flex;align-items:center;gap:11px;text-decoration:none}
.v4 .brandlock .bicon{height:34px;width:auto;display:block}
.v4 .brandlock .btxt{font-family:'Segoe UI',Arial,'PingFang SC',sans-serif;font-weight:800;font-size:23px;letter-spacing:3px;color:#e8edf5;line-height:1}

/* —— 满屏融合 Hero（主页与二级页同规格）——
   背景图 + 左深右透渐变同层融合，文字直接浮在场景上，无卡片、无边框 */
.xhero{position:relative;min-height:calc(100vh - 64px);min-height:calc(100svh - 64px);display:flex;align-items:center;color:#fff;overflow:hidden;background-color:#080e18;
  background-image:linear-gradient(90deg,rgba(8,14,24,.96) 0%,rgba(8,14,24,.93) 34%,rgba(8,14,24,.72) 50%,rgba(16,29,51,.34) 64%,rgba(22,36,63,.10) 78%,rgba(26,45,74,0) 92%),var(--hbg);
  background-size:cover,cover;background-position:center,var(--hpos,right center);background-repeat:no-repeat}
.xhero .wrap{position:relative;z-index:2;width:100%}
.xhero .hx{max-width:min(50vw,600px);display:flex;flex-direction:column;gap:clamp(8px,1.6vh,14px);padding:clamp(16px,3vh,56px) 0 clamp(104px,15vh,150px)}
.xhero .eyebrow{color:#7fb0ff}
.xhero h1{font-size:clamp(34px,5.4vw,64px);font-weight:800;letter-spacing:-.03em;line-height:1.08;color:#f1f5fb;margin:0}
.xhero h1 .accent{color:#6aa8e6}
.xhero .lead{font-size:clamp(15px,1.8vw,17.5px);color:#b4c2d6;max-width:440px;line-height:1.75;margin:0}
.xhero .cta{margin-top:10px;display:flex;gap:12px;flex-wrap:wrap}
.xhero .note{position:absolute;top:clamp(14px,2.6vh,26px);right:clamp(24px,4vw,52px);z-index:3;background:rgba(8,14,24,.55);color:#cdd7e8;padding:8px 16px;border-radius:20px;backdrop-filter:blur(6px);border:1px solid rgba(255,255,255,.12);font-size:clamp(12px,1.5vw,13px);white-space:nowrap}
.xhero .xstats{position:absolute;left:clamp(8px,1vw,14px);bottom:clamp(16px,4.5vh,48px);z-index:3;display:flex;flex-wrap:wrap;border:1px solid rgba(255,255,255,.14);border-radius:13px;overflow:hidden;background:rgba(8,14,24,.42);backdrop-filter:blur(6px)}
.xhero .xstats div{padding:13px 22px;border-right:1px solid rgba(255,255,255,.12)}
.xhero .xstats div:last-child{border-right:none}
.xhero .xstats b{display:block;font-size:clamp(22px,3vw,28px);font-weight:800;color:#e2e8f0;line-height:1.1}
.xhero .xstats b span{font-size:14px;font-weight:500;color:#94a3b8}
.xhero .xstats small{display:block;font-size:clamp(11px,1.4vw,12.5px);color:#8fa2bd;margin-top:2px;text-transform:uppercase;letter-spacing:.04em}
.xhero.short{min-height:calc(88vh - 64px);min-height:calc(88svh - 64px)}
/* —— 无障碍：键盘焦点可视（全站） —— */
a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid #5aa5ff;outline-offset:2px;border-radius:4px}
/* —— 老内核回退：不支持毛玻璃时用实色底 —— */
@supports not (backdrop-filter: blur(1px)){
  .v4 header#top{background:rgba(11,21,36,.96)}
  .mobilecta{background:rgba(10,18,31,.98)}
  #mnav{background:#0a121f}
}
/* —— 各页 Hero 底图（必须定义在本文件内：相对路径以 assets/ 为基准，避免浏览器解析歧义）—— */
.hbg-home{--hbg:url("/assets/v46/media/hero-main-322c1b63.webp")}
.hbg-features{--hbg:url("/assets/v46/media/product-blue-hero34-dd63f225.webp")}
.hbg-lineup{--hbg:url("/assets/v46/media/product-blue-persp-4730e0e0.webp")}
.hbg-materials{--hbg:url("/assets/v4/mat-wood-web-v4.webp")}
.hbg-scenarios{--hbg:url("/assets/v46/media/bg-ambient-dark-d329b373.webp")}
.hbg-story{--hbg:url("/assets/v46/media/factory-dark-a91b3576.webp")}
.hbg-crowd{--hbg:url("/assets/v46/media/bg-spark-de4ca59f.webp")}
/* 首页 Hero：与定版截图完全一致的渐变配比（hero-main.png 底图+产品） */
.xhero.home{background-image:linear-gradient(90deg,rgba(8,14,24,.96) 0%,rgba(8,14,24,.94) 38%,rgba(8,14,24,.75) 50%,rgba(16,29,51,.35) 62%,rgba(22,36,63,.08) 75%,rgba(26,45,74,0) 88%),var(--hbg)}
@media(max-width:820px){.xhero.home{background-image:linear-gradient(180deg,rgba(8,14,24,.94) 0%,rgba(16,29,51,.85) 55%,rgba(22,36,63,.5) 100%),var(--hbg)}}
/* ===== 满屏适配（优先：笔记本 / iPad / 手机竖屏，开屏即见完整 Hero，无需下拉） ===== */

/* —— 笔记本 · 矮视口（≤840px 高）：整体压缩，保证 导航+Hero = 一屏 —— */
@media (min-width:821px) and (max-height:840px){
  .xhero .hx{padding:16px 0 100px;gap:9px}
  .xhero h1{font-size:clamp(26px,4.4vw,46px)}
  .xhero .lead{font-size:14.5px;line-height:1.6;max-width:400px}
  .herofeats{margin:10px 0 2px}
  .herofeats span{font-size:12px;padding:5px 12px}
  .xhero .cta .btn{padding:12px 24px;font-size:14px}
  .xhero .xstats div{padding:10px 16px}
  .xhero .xstats b{font-size:20px}
}
@media (min-width:821px) and (max-height:700px){
  .xhero .hx{padding:10px 0 92px;gap:7px}
  .xhero h1{font-size:clamp(22px,3.8vw,36px)}
  .xhero .lead{font-size:13.5px;max-width:380px}
  .xhero .cta .btn{padding:10px 20px;font-size:13.5px}
  .xhero .xstats div{padding:8px 13px}
  .xhero .xstats b{font-size:18px}
  .xhero .xstats small{font-size:10.5px}
}

/* —— 手机竖屏 + 平板竖屏：单列纵排，整屏塞满不溢出 —— */
@media (max-width:820px), (orientation:portrait) and (max-width:1100px){
  .xhero,.xhero.home{min-height:calc(100vh - 64px);min-height:calc(100svh - 64px);padding:0;background-image:linear-gradient(180deg,rgba(8,14,24,.94) 0%,rgba(16,29,51,.86) 55%,rgba(22,36,63,.55) 100%),var(--hbg);background-position:center,center}
  .xhero .wrap{display:flex;flex-direction:column;justify-content:center;min-height:calc(100vh - 64px);min-height:calc(100svh - 64px);padding-top:44px;padding-bottom:14px}
  .xhero .hx{max-width:100%;padding:0;gap:9px;text-align:center;align-items:center}
  .xhero h1{font-size:clamp(24px,7vw,40px)}
  .xhero .lead{max-width:34em;font-size:clamp(13px,3.5vw,15.5px);line-height:1.6}
  .xhero .note{position:absolute;top:10px;left:50%;right:auto;transform:translateX(-50%);white-space:nowrap;font-size:11.5px;padding:6px 14px;max-width:94vw;overflow:hidden;text-overflow:ellipsis}
  .herofeats{justify-content:center;margin:4px 0 0}
  .herofeats span{font-size:11.5px;padding:5px 11px}
  .xhero .cta{justify-content:center;margin-top:6px}
  .xhero .cta .btn{padding:11px 22px;font-size:14px}
  .xhero .xstats{position:static;width:100%;margin:16px 0 0;display:grid;grid-template-columns:1fr 1fr;border-radius:12px}
  .xhero .xstats div{padding:9px 12px;border-right:none;border-bottom:1px solid rgba(255,255,255,.12)}
  .xhero .xstats div:nth-child(odd){border-right:1px solid rgba(255,255,255,.12)}
  .xhero .xstats div:nth-child(n+3){border-bottom:none}
  .xhero .xstats b{font-size:19px}
  .xhero .xstats small{font-size:10.5px}
}
/* 特矮手机（iPhone SE 等）：精简次要元素，保住 标题+CTA+数据 一屏 */
@media (max-width:820px) and (max-height:660px){
  .xhero .lead{display:none}
  .herofeats{display:none}
  .xhero .xstats div{padding:7px 10px}
}

/* —— ROG 式双语大标题 —— */
.bigen{font-family:'Segoe UI',Arial,sans-serif;font-weight:900;letter-spacing:-.02em;line-height:1.02;font-size:clamp(30px,5vw,58px);color:var(--ink);margin:0}
.bigen .hl{color:var(--accent)}
.dark-sec .bigen{color:#f1f5fb}
.cnsub{font-size:clamp(15px,2vw,19px);color:var(--slate);margin-top:12px;max-width:760px}
.dark-sec .cnsub{color:#aeb8c8}

/* —— 深色板块 —— */
.dark-sec{background:linear-gradient(160deg,#0b1524,#101d33);color:#dfe8f4}
.dark-sec .eyebrow{color:#7fb0ff}
.dark-sec .card{background:rgba(255,255,255,.05);border-color:rgba(255,255,255,.12);color:#dfe8f4}
.dark-sec .card h3{color:#eef4fc}
.dark-sec .card p{color:#a9b8cd}

/* —— 滚动进场动画（渐进增强：JS 就绪才隐藏，杜绝任何"空白页"风险）—— */
html.js .rv{opacity:0;transform:translateY(26px);transition:opacity .7s ease,transform .7s ease}
html.js .rv.in{opacity:1;transform:none}
html.js .rv.d1{transition-delay:.08s}html.js .rv.d2{transition-delay:.16s}html.js .rv.d3{transition-delay:.24s}
@media(prefers-reduced-motion:reduce){html.js .rv{opacity:1;transform:none;transition:none}}

/* —— 速度竞速动画 —— */
.race{margin-top:34px;display:flex;flex-direction:column;gap:18px}
.race .lane{display:grid;grid-template-columns:150px 1fr 90px;gap:14px;align-items:center;text-align:left}
.race .who{font-weight:800;font-size:14px;color:#eef4fc}
.race .who small{display:block;font-weight:500;color:#8fa2bd;font-size:11.5px}
.race .track{height:14px;border-radius:8px;background:rgba(255,255,255,.08);overflow:hidden;position:relative}
.race .bar{height:100%;width:0;border-radius:8px;background:linear-gradient(90deg,#2563eb,#5aa5ff);position:relative}
.race .lane.us .bar{background:linear-gradient(90deg,#f3922e,#ffc46b);box-shadow:0 0 18px rgba(243,146,46,.5)}
.race.run .lane.us .bar{animation:race 1.6s cubic-bezier(.2,.7,.2,1) forwards}
.race.run .lane.c1 .bar{animation:race 1.6s cubic-bezier(.2,.7,.2,1) forwards;animation-name:race40}
.race.run .lane.c2 .bar{animation:race 1.6s cubic-bezier(.2,.7,.2,1) forwards;animation-name:race33}
.race.run .lane.c3 .bar{animation:race 1.6s cubic-bezier(.2,.7,.2,1) forwards;animation-name:race23}
@keyframes race{to{width:100%}}
@keyframes race40{to{width:40%}}
@keyframes race33{to{width:33%}}
@keyframes race23{to{width:23%}}
.race .val{font-weight:800;font-size:15px;color:#e2e8f0;text-align:right;white-space:nowrap}
.race .cap{font-size:12.5px;color:#7d8ea8;text-align:left;margin-top:2px}

/* —— 数字滚动 —— */
.cnum b{font-variant-numeric:tabular-nums}

/* —— 多视角画廊（v4 页面必需，勿删）—— */
.angles{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;margin-top:30px;align-items:start}
.angles figure{margin:0;border:1px solid var(--line);border-radius:14px;overflow:hidden;background:#fff;transition:.2s}
.angles figure:hover{box-shadow:0 14px 30px rgba(20,36,63,.1);transform:translateY(-3px)}
.angles img{width:100%;aspect-ratio:16/9;object-fit:cover;display:block}
.angles figcaption{padding:10px 14px;font-size:13px;font-weight:600;color:var(--slate);text-align:left}
@media(max-width:760px){.angles{grid-template-columns:repeat(2,1fr)}}

/* —— 三档配色 trio（v4 页面必需）—— */
.trio{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px;margin-top:30px}
.trio figure{margin:0;border:1px solid var(--line);border-radius:14px;overflow:hidden;background:#fff}
.trio img{width:100%;aspect-ratio:16/9;object-fit:cover;display:block}
.trio figcaption{padding:12px;font-weight:700;font-size:14px;display:flex;align-items:center;justify-content:center;gap:8px}
.dot{width:12px;height:12px;border-radius:50%;display:inline-block}
.dot.g{background:#3fae5a}.dot.o{background:#f3922e}.dot.gr{background:#6b7686}
@media(max-width:760px){.trio{grid-template-columns:1fr}}

/* —— 特性深潜行（图文融合，无边框感）—— */
.deep{display:grid;grid-template-columns:1fr 1fr;gap:clamp(24px,4vw,56px);align-items:center;margin:0}
.deep.rev .m{order:2}
.deep .m img{width:100%;border-radius:18px;display:block;box-shadow:0 24px 60px rgba(10,20,40,.18)}
.deep .t .eyebrow{margin-bottom:8px;display:block}
.deep .t h2{font-size:clamp(24px,3.2vw,38px);font-weight:800;letter-spacing:-.02em}
.deep .t .en{font-weight:900;color:var(--accent);font-size:clamp(13px,1.5vw,15px);letter-spacing:.12em;text-transform:uppercase}
.deep .t p{color:var(--slate);margin-top:12px;font-size:clamp(15px,1.8vw,17px);max-width:520px}
.deep ul{list-style:none;margin:16px 0 0}
.deep li{padding:7px 0 7px 24px;position:relative;font-size:15px;color:#3a4659}
.deep li:before{content:"▹";position:absolute;left:0;color:var(--accent);font-weight:800}
.dark-sec .deep .t h2{color:#eef4fc}.dark-sec .deep .t p{color:#a9b8cd}.dark-sec .deep li{color:#c3d0e2}
@media(max-width:820px){.deep{grid-template-columns:1fr}.deep.rev .m{order:0}}

/* —— 全出血图带 —— */
.fullband{position:relative;min-height:clamp(320px,44vw,520px);display:flex;align-items:center;justify-content:center;text-align:center;color:#fff;background-size:cover;background-position:center;background-color:#0b1524}
.fullband:before{content:"";position:absolute;inset:0;background:linear-gradient(rgba(8,15,28,.5),rgba(8,15,28,.72))}
.fullband .wrap{position:relative;z-index:1}

/* —— 材料参数表 / Tab —— */
.tabs{display:flex;gap:8px;flex-wrap:wrap;justify-content:center;margin-top:26px}
.tabs button{border:1px solid var(--line);background:#fff;border-radius:30px;padding:9px 20px;font-weight:700;font-size:14px;color:#33425c;cursor:pointer;transition:.15s}
.tabs button.on{background:var(--navy);color:#fff;border-color:var(--navy)}
.tabpane{display:none;margin-top:30px}
.tabpane.on{display:block}
.mtable{width:100%;border-collapse:collapse;background:#fff;border:1px solid var(--line);border-radius:14px;overflow:hidden}
.mtable th{background:var(--soft);text-align:left;padding:12px 14px;font-size:13.5px;color:#33425c;border-bottom:1px solid var(--line)}
.mtable td{padding:12px 14px;border-bottom:1px solid var(--line);font-size:14px;vertical-align:top}
.mtable tr:last-child td{border-bottom:none}
.mgrid{display:grid;grid-template-columns:1fr 1.4fr;gap:clamp(18px,3vw,34px);align-items:start}
.mgrid img{width:100%;border-radius:14px;aspect-ratio:4/3;object-fit:cover}
@media(max-width:820px){.mgrid{grid-template-columns:1fr}}
.danger-band{background:linear-gradient(120deg,#3d1412,#5a1d14);color:#ffe7dd;border-radius:20px;padding:clamp(26px,4vw,40px);text-align:center}
.danger-band h3{color:#ffb4a0;font-size:clamp(19px,2.6vw,24px)}
.danger-band p{margin-top:10px;color:#f4c9bb;font-size:15px}
.danger-band .chips{display:flex;gap:10px;flex-wrap:wrap;justify-content:center;margin-top:16px}
.danger-band .chips span{background:rgba(255,255,255,.1);border:1px solid rgba(255,180,160,.4);border-radius:30px;padding:7px 16px;font-weight:700;font-size:13.5px}

/* —— 占位图框架说明 —— */
.phwrap{position:relative}
.phwrap img{width:100%;border-radius:18px;display:block}
.phcap{font-size:12.5px;color:#94a3b8;margin-top:8px;text-align:center}

/* —— 专利/对比数字条 —— */
.pstrip{display:grid;grid-template-columns:1fr auto 1fr;gap:clamp(16px,4vw,44px);align-items:center;max-width:860px;margin:34px auto 0}
.pstrip .side{text-align:center}
.pstrip .side b{display:block;font-size:clamp(48px,9vw,96px);font-weight:900;line-height:1;letter-spacing:-.03em}
.pstrip .side.us b{color:#f3922e}
.pstrip .side.them b{color:#54637a}
.pstrip .side span{display:block;margin-top:8px;color:#8fa2bd;font-size:clamp(12px,1.6vw,14.5px)}
.pstrip .vs{font-weight:900;font-size:clamp(18px,3vw,26px);color:#3d4f68}

/* —— UGC / 晒单条 —— */
.ugcrow{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:28px}
.ugcrow img{width:100%;aspect-ratio:1/1;object-fit:cover;border-radius:14px}
@media(max-width:760px){.ugcrow{grid-template-columns:repeat(2,1fr)}}

/* —— 时间线 —— */
.tline{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:34px;text-align:left}
.tline .step{background:#fff;border:1px solid var(--line);border-radius:14px;padding:20px}
.tline .step .no{width:34px;height:34px;border-radius:50%;background:var(--accent);color:#fff;font-weight:800;display:flex;align-items:center;justify-content:center;margin-bottom:12px}
.tline .step h4{font-size:15.5px}
.tline .step p{color:var(--slate);font-size:13.5px;margin-top:6px}
@media(max-width:860px){.tline{grid-template-columns:1fr 1fr}}

/* —— 页脚（同 v3）—— */
.v4 footer .fcols{display:grid;grid-template-columns:1.5fr 1fr 1fr;gap:clamp(20px,3vw,40px);align-items:start;padding:clamp(16px,2.4vw,26px) 0 0}
.v4 footer .fcols h3{font-size:16px;color:#e8edf5}
.v4 footer .fcols .sub{color:#aab6c9;margin-top:4px}
.v4 .fbottom{display:flex;justify-content:space-between;align-items:center;gap:20px;flex-wrap:wrap;border-top:1px solid rgba(255,255,255,.1);margin-top:clamp(18px,2.6vw,28px);padding-top:clamp(14px,2vw,20px)}
.v4 .fbottom .legaltxt{font-size:12.5px;color:#8090a6}
.v4 .footlogo{display:inline-flex;align-items:center;gap:14px;text-decoration:none}
.v4 .footlogo .fi{height:44px;width:auto;display:block}
.v4 .footlogo .fw{font-family:'Segoe UI',Arial,'PingFang SC',sans-serif;font-weight:800;font-size:clamp(20px,2.4vw,28px);letter-spacing:4px;color:#e8edf5;line-height:1}
@media(max-width:820px){.v4 footer .fcols{grid-template-columns:1fr}.v4 .fbottom{justify-content:center;text-align:center}}

/* ═══════════ v4.1（0714晚）：众筹置顶 / 预订链路 / 可点击态 / 手机专业版 ═══════════ */

/* —— 全站公告条：众筹滚动导航条（只放众筹入口与好处关键词）—— */
.annbar{display:block;overflow:hidden;background:linear-gradient(90deg,#b35c10,#f3922e 45%,#ffb45e);color:#1a1206;text-decoration:none;white-space:nowrap}
.annbar:hover{filter:brightness(1.06)}
.annbar .antk{display:inline-block;white-space:nowrap;animation:marq 26s linear infinite;padding:9px 0;font-weight:800;font-size:clamp(12.5px,1.5vw,14.5px);letter-spacing:.02em}
.annbar:hover .antk{animation-play-state:paused}
.annbar .antk span{margin:0 20px}
.annbar .antk .sep{color:#8a4a08;font-weight:900}
.annbar .antk .go{background:#1a1206;color:#ffc46b;border-radius:20px;padding:3px 14px;font-size:12.5px}

/* —— 导航众筹高亮（橙色胶囊）—— */
.v4 header#top nav a.navcta{background:linear-gradient(90deg,#f3922e,#ffb45e);color:#1a1206;font-weight:800;border-radius:20px;padding:7px 14px;margin-left:6px}
.v4 header#top nav a.navcta:hover{color:#000;filter:brightness(1.07)}

/* —— 首页众筹预告大图 banner —— */
.ksband{position:relative;overflow:hidden;background:#0b1524 url("/assets/v46/media/bg-spark-de4ca59f.webp") center/cover no-repeat}
.ksband:before{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(8,14,24,.92) 0%,rgba(8,14,24,.72) 45%,rgba(8,14,24,.35) 100%)}
.ksband .wrap{position:relative;z-index:1;display:grid;grid-template-columns:1.1fr .9fr;gap:clamp(20px,4vw,48px);align-items:center;padding-top:clamp(40px,6vw,72px);padding-bottom:clamp(40px,6vw,72px)}
.ksband .kicker{display:inline-flex;align-items:center;gap:8px;background:rgba(243,146,46,.16);border:1px solid rgba(243,146,46,.5);color:#ffc46b;border-radius:20px;padding:6px 14px;font-weight:800;font-size:12.5px;letter-spacing:.14em;text-transform:uppercase}
.ksband h2{color:#f1f5fb;font-size:clamp(28px,4.6vw,52px);font-weight:900;letter-spacing:-.02em;line-height:1.06;margin:16px 0 10px}
.ksband h2 .hl{color:#ffb45e}
.ksband p{color:#c3d0e2;max-width:520px;font-size:clamp(14px,1.8vw,16.5px)}
.ksband .kcta{margin-top:22px;display:flex;gap:12px;flex-wrap:wrap}
.ksband img.kimg{width:100%;border-radius:18px;box-shadow:0 30px 70px rgba(0,0,0,.5)}
@media(max-width:820px){.ksband .wrap{grid-template-columns:1fr;text-align:center}.ksband p{margin:0 auto}.ksband .kcta{justify-content:center}}

/* —— 可点击卡片：全卡热区 + 悬停态 + 角标箭头 —— */
.card{position:relative}
a.stretch{position:absolute;inset:0;z-index:3;border-radius:inherit}
.clickcard{cursor:pointer;transition:.18s}
.clickcard:hover{box-shadow:0 18px 40px rgba(20,36,63,.16);transform:translateY(-4px);border-color:var(--accent)}
.clickcard .golink{display:inline-flex;align-items:center;gap:6px;color:var(--accent);font-weight:800;font-size:13.5px;margin-top:10px}
.clickcard:hover .golink{text-decoration:underline}
.dark-sec .clickcard:hover{border-color:#7fb0ff;box-shadow:0 18px 40px rgba(0,0,0,.45)}
/* 正文可点击链接统一下划线可供性 */
.v4 section a:not(.btn):not(.stretch){text-decoration:underline;text-decoration-color:rgba(59,130,246,.35);text-underline-offset:3px}
.v4 section a:not(.btn):not(.stretch):hover{text-decoration-color:var(--accent)}

/* —— 三步预订流程（众筹页）—— */
.paysteps{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:30px auto 0;max-width:980px;text-align:left}
.paysteps .ps{background:#fff;border:1px solid var(--line);border-radius:14px;padding:20px;position:relative}
.paysteps .ps .no{width:34px;height:34px;border-radius:50%;background:var(--accent);color:#fff;font-weight:800;display:flex;align-items:center;justify-content:center;margin-bottom:12px}
.paysteps .ps.hot .no{background:#f3922e;color:#1a1206}
.paysteps .ps h4{font-size:15.5px}
.paysteps .ps p{color:var(--slate);font-size:13.5px;margin-top:6px}
.paynote{max-width:760px;margin:18px auto 0;font-size:13px;color:#64748b;text-align:center}
@media(max-width:820px){.paysteps{grid-template-columns:1fr}}

/* —— 吸底购买条（桌面端 · features/crowdfunding）—— */
#buybar .inner{max-width:calc(100vw - 76px);margin:0 auto;padding:0 clamp(8px,1vw,14px)}
@media(max-width:820px){#buybar{display:none}}

/* —— 手机吸底 CTA 条（≤820px 全站）—— */
.mobilecta{display:none}
@media(max-width:820px){
  .mobilecta{display:flex;position:fixed;left:0;right:0;bottom:0;z-index:70;background:rgba(10,18,31,.92);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-top:1px solid rgba(255,255,255,.12);padding:10px 12px calc(10px + env(safe-area-inset-bottom));gap:10px}
  .mobilecta a{flex:1;text-align:center;font-weight:800;font-size:15px;border-radius:12px;padding:13px 10px;min-height:48px;display:flex;align-items:center;justify-content:center}
  .mobilecta .m1{background:linear-gradient(90deg,#f3922e,#ffb45e);color:#1a1206}
  .mobilecta .m2{background:rgba(255,255,255,.1);color:#e8edf5;border:1px solid rgba(255,255,255,.22)}
  body.v4{padding-bottom:74px}
}

/* —— 手机导航：汉堡菜单 —— */
.menubtn{display:none}
#mnav{display:none} /* 修复：桌面端此前裸渲染成链接列表 */
@media(max-width:900px){
  .v4 .nav nav{display:none}
  .menubtn{display:flex;flex-direction:column;justify-content:center;gap:5px;width:46px;height:46px;padding:10px;background:transparent;border:0;cursor:pointer;margin-left:auto}
  .menubtn span{display:block;height:2.5px;border-radius:2px;background:#e8edf5;transition:.25s}
  .menubtn.open span:nth-child(1){transform:translateY(7.5px) rotate(45deg)}
  .menubtn.open span:nth-child(2){opacity:0}
  .menubtn.open span:nth-child(3){transform:translateY(-7.5px) rotate(-45deg)}
  .v4 .nav .btn{display:none}
  #mnav{position:fixed;top:0;left:0;right:0;bottom:0;z-index:60;background:rgba(9,16,28,.98);backdrop-filter:blur(16px);display:none;flex-direction:column;padding:86px 26px 30px;gap:4px}
  #mnav.open{display:flex}
  #mnav a{color:#e8edf5;font-size:19px;font-weight:700;padding:15px 8px;border-bottom:1px solid rgba(255,255,255,.08);display:flex;justify-content:space-between;align-items:center}
  #mnav a:after{content:"→";color:#5a7599;font-size:16px}
  #mnav a.mcta{background:linear-gradient(90deg,#f3922e,#ffb45e);color:#1a1206;border-radius:14px;border-bottom:none;justify-content:center;font-weight:800;margin-top:18px}
  #mnav a.mcta:after{content:""}
  .v4 header#top{z-index:65}
}

/* —— 手机排版专业化（≤820px）—— */
@media(max-width:820px){
  html{-webkit-text-size-adjust:100%}
  .v4 section{padding:clamp(34px,9vw,48px) 0}
  .v4 .wrap{max-width:calc(100vw - 32px);padding:0}
  .bigen{font-size:clamp(26px,8vw,34px)}
  .cnsub{font-size:15px}
  .h2c{font-size:clamp(23px,6.6vw,28px)}
  .lead2{font-size:15px}
  .deep{gap:18px}
  .deep .t h2{font-size:clamp(21px,6vw,26px)}
  .deep .t p{font-size:15px}
  .deep li{font-size:14.5px;padding:8px 0 8px 24px}
  .btn{padding:14px 26px;min-height:48px;display:inline-flex;align-items:center;justify-content:center}
  .feat{gap:12px}
  .card{padding:18px}
  .card h3{font-size:16.5px}
  .card p{font-size:14px}
  .trust{grid-template-columns:1fr 1fr;gap:14px}
  .angles{grid-template-columns:1fr;gap:12px}
  .trio{gap:12px}
  .teaser{gap:12px}
  .tiers{gap:14px}
  .tier .btn{width:100%}
  .samplewall{grid-template-columns:1fr;gap:12px}
  .ugcrow{gap:10px}
  .race .lane{grid-template-columns:96px 1fr 74px;gap:8px}
  .race .who{font-size:12px}
  .race .val{font-size:12.5px}
  .pstrip{grid-template-columns:1fr;gap:10px}
  .pstrip .vs{display:none}
  .tline{grid-template-columns:1fr;gap:12px}
  .mtable th,.mtable td{padding:10px 10px;font-size:13px}
  .tabs button{padding:10px 16px;font-size:13.5px;min-height:44px}
  .annbar{font-size:12px;padding:8px 10px;text-align:center}
  .annbar .go{display:none}
  footer{padding-bottom:20px}
}

/* —— 板块节奏 —— */
.v4 section{padding:clamp(48px,7vw,84px) 0}
.v4 section.tight{padding:clamp(32px,5vw,52px) 0}
.v4 .teaser{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px;text-align:left;margin-top:32px}
.v4 .teaser .card{padding:0;overflow:hidden}
.v4 .teaser .card img{width:100%;aspect-ratio:16/9;object-fit:cover;display:block}
@media(max-width:820px){.v4 .teaser{grid-template-columns:1fr}}