/* =============================================================
   NeuroNAS — 家庭AI NAS脑机健康终端 · 官网
   基调：深空暗色 / 神经科技 / 青蓝紫辉光 / 玻璃拟态
   ============================================================= */
:root{
  --bg:        #05060f;        /* 深空底 */
  --bg-2:      #0a0d1f;        /* 次级面 */
  --bg-3:      #11142b;        /* 卡片底 */
  --panel:     rgba(20,24,52,.55);
  --line:      rgba(120,140,255,.14);
  --line-2:    rgba(120,140,255,.28);
  --cyan:      #34e6ff;
  --blue:      #4f7bff;
  --violet:    #8b5cf6;
  --magenta:   #e248ff;
  --green:     #2ee6a6;
  --txt:       #e8ecff;
  --txt2:      #9aa3c7;
  --txt3:      #5f6792;
  --radius:    16px;
  --nav-h:     64px;
  --maxw:      1200px;
  --font: "PingFang SC","Noto Sans SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --mono: "SF Mono","JetBrains Mono","Cascadia Code",ui-monospace,monospace;
  --grad:    linear-gradient(120deg,var(--cyan),var(--blue) 45%,var(--violet) 80%,var(--magenta));
  --grad-soft: linear-gradient(120deg,var(--cyan),var(--violet));
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px;-webkit-font-smoothing:antialiased}
body{
  font-family:var(--font);color:var(--txt);background:var(--bg);
  line-height:1.75;overflow-x:hidden;position:relative;
}
img{max-width:100%;display:block}
a{text-decoration:none;color:inherit}
ul{list-style:none}
.ct{width:min(100%,var(--maxw));margin:0 auto;padding:0 clamp(1.4rem,4vw,3.5rem)}
::selection{background:rgba(52,230,255,.25);color:#fff}

/* 全局星点 / 网格背景层 */
.bg-fx{position:fixed;inset:0;z-index:-2;pointer-events:none;
  background:
    radial-gradient(ellipse 60% 50% at 15% 0%,rgba(79,123,255,.16),transparent 60%),
    radial-gradient(ellipse 50% 50% at 90% 10%,rgba(226,72,255,.12),transparent 55%),
    radial-gradient(ellipse 60% 60% at 50% 110%,rgba(52,230,255,.10),transparent 60%),
    var(--bg);
}
.bg-grid{position:fixed;inset:0;z-index:-1;pointer-events:none;opacity:.5;
  background-image:
    linear-gradient(var(--line) 1px,transparent 1px),
    linear-gradient(90deg,var(--line) 1px,transparent 1px);
  background-size:54px 54px;
  -webkit-mask-image:radial-gradient(ellipse 80% 70% at 50% 30%,#000 30%,transparent 80%);
          mask-image:radial-gradient(ellipse 80% 70% at 50% 30%,#000 30%,transparent 80%);
}
#neural{position:fixed;inset:0;z-index:-1;pointer-events:none;opacity:.55}

/* ---- buttons ---- */
.btn{
  display:inline-flex;align-items:center;gap:.5rem;
  padding:.8rem 1.7rem;border-radius:10px;font-weight:600;font-size:.92rem;
  cursor:pointer;border:1px solid transparent;transition:all .22s ease;position:relative;
  font-family:var(--font);
}
.btn-primary{background:var(--grad-soft);color:#04122b;font-weight:700;box-shadow:0 6px 26px rgba(52,230,255,.22)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 10px 34px rgba(79,123,255,.4)}
.btn-outline{border-color:var(--line-2);color:var(--txt);background:rgba(255,255,255,.02);backdrop-filter:blur(6px)}
.btn-outline:hover{border-color:var(--cyan);color:var(--cyan);box-shadow:0 0 20px rgba(52,230,255,.18)}
.btn-lg{padding:1rem 2.3rem;font-size:1rem}

/* ---- section helpers ---- */
.sect{padding:6rem 0;position:relative}
.sect-alt{background:linear-gradient(180deg,transparent,rgba(10,13,31,.6),transparent)}
.sect-head{text-align:center;max-width:680px;margin:0 auto 3.4rem}
.sect-tag{display:inline-block;font-family:var(--mono);font-size:.7rem;letter-spacing:.22em;text-transform:uppercase;
  color:var(--cyan);font-weight:700;margin-bottom:.8rem;
  padding:.32rem .8rem;border:1px solid var(--line-2);border-radius:999px;background:rgba(52,230,255,.05)}
.sect-title{font-size:clamp(1.55rem,3.6vw,2.5rem);font-weight:800;line-height:1.25;letter-spacing:-.01em}
.sect-title .grad,.grad{background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;color:transparent}
.sect-desc{color:var(--txt2);margin:1rem auto 0;font-size:1rem;max-width:600px}

/* reveal animation */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:none}
.reveal[data-d="1"]{transition-delay:.08s}
.reveal[data-d="2"]{transition-delay:.16s}
.reveal[data-d="3"]{transition-delay:.24s}
.reveal[data-d="4"]{transition-delay:.32s}

/* ========== HEADER ========== */
.hdr{position:fixed;inset:0 0 auto 0;z-index:999;height:var(--nav-h);
  background:rgba(5,6,15,.55);backdrop-filter:blur(16px);
  border-bottom:1px solid transparent;transition:all .28s}
.hdr.scrolled{background:rgba(5,6,15,.85);border-bottom-color:var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:var(--nav-h)}
.logo{font-weight:800;font-size:1.18rem;color:var(--txt);display:flex;align-items:center;gap:.5rem;letter-spacing:-.01em}
.logo-icon{width:26px;height:26px;display:inline-grid;place-items:center;border-radius:8px;
  background:var(--grad-soft);color:#04122b;font-size:.95rem;font-weight:900;
  box-shadow:0 0 16px rgba(52,230,255,.4)}
.logo b{background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.nav-links ul{display:flex;gap:1.7rem;align-items:center}
.nav-links a{font-size:.87rem;font-weight:500;color:var(--txt2);transition:color .2s;position:relative}
.nav-links a:hover,.nav-links a.active{color:var(--txt)}
.nav-links a.active::after,.nav-links a:not(.nav-cta):hover::after{content:"";position:absolute;bottom:-6px;left:0;right:0;height:2px;border-radius:2px;background:var(--grad-soft)}
.nav-cta{background:var(--grad-soft);color:#04122b!important;padding:.5rem 1.15rem;border-radius:8px;font-weight:700;font-size:.82rem;box-shadow:0 0 16px rgba(52,230,255,.25)}
.nav-cta:hover{transform:translateY(-1px)}
.menu-btn{display:none;background:none;border:none;font-size:1.5rem;color:var(--txt);cursor:pointer}
/* 语言切换 */
.nav-right{display:flex;align-items:center;gap:1rem}
.lang-switch{font-family:var(--mono);font-size:.78rem;font-weight:600;letter-spacing:.04em;color:var(--txt2);
  padding:.4rem .85rem;border:1px solid var(--line-2);border-radius:999px;background:rgba(52,230,255,.05);
  white-space:nowrap;transition:color .2s,border-color .2s,box-shadow .2s}
.lang-switch:hover{color:var(--cyan);border-color:var(--cyan);box-shadow:0 0 16px rgba(52,230,255,.18)}

/* ========== HERO ========== */
.hero{position:relative;display:flex;align-items:center;
  padding:calc(var(--nav-h) + 4.5rem) 0 5rem;overflow:hidden}
.hero-inner{position:relative;z-index:2;width:100%}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:4rem;align-items:center}
.hero-copy{max-width:600px;padding-left:2rem}      /* 左侧文案 · 离左边更远 */
.hero-visual{padding-right:2rem}                    /* 右侧视觉 · 离右边更远 */
.hero-tag{display:inline-flex;align-items:center;gap:.5rem;font-family:var(--mono);font-size:.72rem;letter-spacing:.1em;
  color:var(--cyan);margin-bottom:1.4rem;padding:.4rem .9rem;border:1px solid var(--line-2);border-radius:999px;
  background:rgba(52,230,255,.05)}
.hero-tag .pulse{width:7px;height:7px;border-radius:50%;background:var(--cyan);box-shadow:0 0 10px var(--cyan);animation:pulse 1.8s infinite}
@keyframes pulse{0%,100%{opacity:1;transform:scale(1)}50%{opacity:.4;transform:scale(.7)}}
.hero h1{font-size:clamp(2.3rem,5.4vw,4rem);font-weight:900;line-height:1.12;margin-bottom:1.3rem;letter-spacing:-.02em}
.hero-desc{font-size:1.06rem;line-height:1.85;color:var(--txt2);margin-bottom:2rem}
.hero-btns{display:flex;flex-wrap:wrap;gap:.9rem}
.hero-stats{margin-top:2.6rem;display:flex;gap:2.2rem;flex-wrap:wrap}
.hero-stat .num{font-family:var(--mono);font-size:1.7rem;font-weight:800;background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;line-height:1}
.hero-stat .lbl{font-size:.76rem;color:var(--txt3);margin-top:.3rem}

/* hero 视觉：中枢核心 */
.hero-visual{position:relative;display:flex;align-items:center;justify-content:center;min-height:420px}
.core{position:relative;width:min(300px,76vw);height:min(300px,76vw);display:grid;place-items:center}
.core-ring{position:absolute;border-radius:50%;border:1px solid var(--line-2)}
.core-ring.r1{inset:0;animation:spin 22s linear infinite}
.core-ring.r2{inset:34px;border-color:rgba(52,230,255,.25);animation:spin 16s linear infinite reverse}
.core-ring.r3{inset:70px;border-color:rgba(226,72,255,.22);animation:spin 28s linear infinite}
.core-ring::before{content:"";position:absolute;width:9px;height:9px;border-radius:50%;background:var(--cyan);
  top:-5px;left:50%;margin-left:-4px;box-shadow:0 0 14px var(--cyan)}
.core-ring.r2::before{background:var(--magenta);box-shadow:0 0 14px var(--magenta)}
.core-ring.r3::before{background:var(--violet);box-shadow:0 0 14px var(--violet)}
@keyframes spin{to{transform:rotate(360deg)}}
.core-chip{width:118px;height:118px;border-radius:26px;display:grid;place-items:center;position:relative;
  background:linear-gradient(145deg,#141a3a,#0a0d22);border:1px solid var(--line-2);
  box-shadow:0 0 50px rgba(79,123,255,.4),inset 0 0 22px rgba(52,230,255,.12)}
.core-chip span{font-family:var(--mono);font-size:.66rem;letter-spacing:.12em;color:var(--cyan);position:absolute;bottom:14px}
.core-chip svg{width:54px;height:54px}
.core-glow{position:absolute;inset:-60px;border-radius:50%;background:radial-gradient(circle,rgba(79,123,255,.3),transparent 65%);filter:blur(8px);z-index:-1;animation:breathe 4s ease-in-out infinite}
@keyframes breathe{0%,100%{opacity:.55;transform:scale(.95)}50%{opacity:1;transform:scale(1.06)}}
/* hero 浮动信号卡 */
.float-card{position:absolute;background:var(--panel);border:1px solid var(--line);border-radius:12px;
  padding:.6rem .85rem;font-size:.76rem;backdrop-filter:blur(12px);display:flex;align-items:center;gap:.5rem;
  box-shadow:0 8px 30px rgba(0,0,0,.4);white-space:nowrap;animation:floaty 5s ease-in-out infinite}
.float-card .dot{width:7px;height:7px;border-radius:50%;flex-shrink:0}
.dot.g{background:var(--green);box-shadow:0 0 8px var(--green)}
.dot.c{background:var(--cyan);box-shadow:0 0 8px var(--cyan)}
.dot.m{background:var(--magenta);box-shadow:0 0 8px var(--magenta)}
.float-card b{font-family:var(--mono);color:var(--txt)}
.fc-1{top:8%;right:-4%}.fc-2{bottom:14%;left:-8%;animation-delay:1.4s}.fc-3{bottom:36%;right:2%;animation-delay:2.6s}
@keyframes floaty{0%,100%{transform:translateY(0)}50%{transform:translateY(-12px)}}

/* EEG 波形条 */
.eeg{width:100%;height:42px;display:block}
.eeg polyline{fill:none;stroke:var(--cyan);stroke-width:2;stroke-linecap:round;stroke-linejoin:round;
  filter:drop-shadow(0 0 4px rgba(52,230,255,.6));
  stroke-dasharray:600;animation:dash 3s linear infinite}
@keyframes dash{to{stroke-dashoffset:-600}}

/* ========== generic card ========== */
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:1.9rem 1.7rem;
  backdrop-filter:blur(10px);transition:transform .25s,border-color .25s,box-shadow .25s;position:relative;overflow:hidden}
.card::after{content:"";position:absolute;inset:0;border-radius:inherit;padding:1px;
  background:var(--grad);-webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);
  -webkit-mask-composite:xor;mask-composite:exclude;opacity:0;transition:opacity .3s;pointer-events:none}
.card:hover{transform:translateY(-5px);box-shadow:0 18px 44px rgba(0,0,0,.45)}
.card:hover::after{opacity:.7}

/* grids */
.grid-3{display:grid;grid-template-columns:repeat(auto-fit,minmax(290px,1fr));gap:1.4rem}
.grid-2{display:grid;grid-template-columns:repeat(auto-fit,minmax(340px,1fr));gap:1.4rem}
.grid-4{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:1.2rem}

/* feature / innovation card */
.icard .ic-num{font-family:var(--mono);font-size:.72rem;color:var(--cyan);letter-spacing:.1em}
.icard .ic-ico{width:52px;height:52px;border-radius:13px;display:grid;place-items:center;margin:.9rem 0 1.1rem;
  background:rgba(79,123,255,.1);border:1px solid var(--line-2)}
.icard .ic-ico svg{width:28px;height:28px;stroke:var(--cyan);fill:none;stroke-width:1.7}
.icard h3{font-size:1.12rem;margin-bottom:.6rem;font-weight:700}
.icard p{font-size:.9rem;color:var(--txt2);line-height:1.78}

/* step card */
.step-card .sc-num{font-family:var(--mono);font-size:2.6rem;font-weight:900;line-height:1;
  background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;opacity:.55}
.step-card h3{font-size:1.05rem;margin:.7rem 0 .5rem}
.step-card p{font-size:.88rem;color:var(--txt2)}

/* ===== ARCHITECTURE DIAGRAM ===== */
.arch{display:flex;flex-direction:column;gap:0;max-width:920px;margin:0 auto}
.arch-layer{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:1.5rem 1.6rem;position:relative;backdrop-filter:blur(8px)}
.arch-layer + .arch-layer{margin-top:2.4rem}
.arch-layer::before{content:"";position:absolute;top:-2.4rem;left:50%;width:2px;height:2.4rem;
  background:linear-gradient(var(--cyan),transparent);transform:translateX(-50%)}
.arch-layer:first-child::before{display:none}
.arch-flow{position:absolute;top:-1.7rem;left:50%;transform:translateX(-50%);font-family:var(--mono);font-size:.62rem;
  color:var(--cyan);background:var(--bg);padding:0 .5rem;letter-spacing:.06em}
.arch-tag{font-family:var(--mono);font-size:.68rem;letter-spacing:.12em;color:var(--violet);text-transform:uppercase;margin-bottom:.9rem;font-weight:700}
.arch-row{display:flex;flex-wrap:wrap;gap:.7rem}
.arch-box{flex:1;min-width:150px;background:rgba(10,13,34,.7);border:1px solid var(--line);border-radius:10px;padding:.85rem 1rem}
.arch-box h5{font-size:.86rem;margin-bottom:.3rem;color:var(--txt)}
.arch-box p{font-size:.74rem;color:var(--txt3);font-family:var(--mono);line-height:1.6}
.arch-box.hl{border-color:var(--line-2);box-shadow:inset 0 0 22px rgba(79,123,255,.1)}

/* ===== product showcase ===== */
.prod{display:grid;grid-template-columns:1fr 1fr;gap:2.6rem;align-items:center;margin-bottom:5rem}
.prod:nth-child(even) .prod-visual{order:2}
.prod-visual{position:relative;aspect-ratio:4/3;border-radius:20px;display:grid;place-items:center;
  background:radial-gradient(circle at 50% 40%,rgba(79,123,255,.16),transparent 60%),linear-gradient(160deg,#0c1024,#070912);
  border:1px solid var(--line);overflow:hidden}
.prod-visual .ph-tag{position:absolute;top:.8rem;left:.8rem;font-family:var(--mono);font-size:.62rem;color:var(--txt3);
  border:1px dashed var(--line-2);padding:.25rem .6rem;border-radius:6px;letter-spacing:.05em}
.prod-visual img{width:100%;height:100%;object-fit:cover;display:block;transition:transform .5s ease}
.prod-visual:hover img{transform:scale(1.04)}
.prod-kicker{font-family:var(--mono);font-size:.74rem;letter-spacing:.14em;color:var(--cyan);margin-bottom:.7rem;text-transform:uppercase}
.prod h2{font-size:clamp(1.5rem,3vw,2.1rem);font-weight:800;margin-bottom:.7rem}
.prod .prod-spec{display:inline-block;font-family:var(--mono);font-size:.74rem;color:var(--txt2);
  padding:.32rem .8rem;margin-bottom:1.2rem;border:1px solid var(--line);border-radius:999px;background:rgba(120,140,255,.05)}
.prod p.lead{color:var(--txt2);margin-bottom:1.4rem;line-height:1.8}
.prod ul.pts{display:flex;flex-direction:column;gap:.85rem}
.prod ul.pts li{display:flex;gap:.7rem;font-size:.9rem;color:var(--txt2);line-height:1.6}
.prod ul.pts li::before{content:"";width:8px;height:8px;border-radius:50%;background:var(--grad-soft);margin-top:.5rem;flex-shrink:0;box-shadow:0 0 8px rgba(52,230,255,.5)}

/* spec table */
.spec-table{width:100%;border-collapse:collapse;font-size:.88rem}
.spec-table th{text-align:left;font-family:var(--mono);font-size:.7rem;letter-spacing:.1em;color:var(--cyan);
  text-transform:uppercase;padding:.9rem 1rem;border-bottom:1px solid var(--line-2)}
.spec-table td{padding:.85rem 1rem;border-bottom:1px solid var(--line);color:var(--txt2);vertical-align:top}
.spec-table td:first-child{color:var(--txt);font-weight:600;white-space:nowrap}
.spec-table tr:hover td{background:rgba(79,123,255,.04)}

/* chip pill list */
.chips{display:flex;flex-wrap:wrap;gap:.6rem;margin-top:.4rem}
.chip{font-family:var(--mono);font-size:.74rem;padding:.35rem .8rem;border-radius:999px;
  border:1px solid var(--line-2);color:var(--txt2);background:rgba(79,123,255,.06)}

/* scenario / moat list */
.scene{display:grid;grid-template-columns:64px 1fr;gap:1.3rem;padding:1.7rem;align-items:start}
.scene .s-ico{width:56px;height:56px;border-radius:14px;display:grid;place-items:center;font-size:1.6rem;
  background:rgba(79,123,255,.1);border:1px solid var(--line-2)}
.scene h3{font-size:1.12rem;margin-bottom:.5rem}
.scene p{font-size:.9rem;color:var(--txt2)}

/* CTA band */
.cta{position:relative;padding:5.5rem 0;text-align:center;overflow:hidden;
  background:linear-gradient(135deg,rgba(79,123,255,.14),rgba(226,72,255,.1));border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.cta h2{font-size:clamp(1.6rem,3.4vw,2.4rem);font-weight:800;margin-bottom:.8rem}
.cta p{color:var(--txt2);max-width:540px;margin:0 auto 1.8rem}

/* page hero (内页头) */
.phero{padding:calc(var(--nav-h) + 4.5rem) 0 3.5rem;text-align:center;position:relative}
.phero h1{font-size:clamp(2rem,4.5vw,3.2rem);font-weight:900;line-height:1.15;margin-bottom:1rem;letter-spacing:-.02em}
.phero p{color:var(--txt2);max-width:640px;margin:0 auto;font-size:1.05rem}

/* quote / callout */
.callout{border-left:3px solid var(--cyan);background:rgba(52,230,255,.05);padding:1.3rem 1.6rem;border-radius:0 12px 12px 0;
  color:var(--txt);font-size:1rem;line-height:1.8;max-width:780px;margin:0 auto}

/* contact form */
.form-wrap{max-width:600px;margin:0 auto}
.fld{margin-bottom:1.2rem}
.fld label{display:block;font-size:.82rem;color:var(--txt2);margin-bottom:.45rem;font-weight:500}
.fld input,.fld select,.fld textarea{width:100%;background:rgba(10,13,34,.7);border:1px solid var(--line);border-radius:10px;
  padding:.8rem 1rem;color:var(--txt);font-family:var(--font);font-size:.92rem;transition:border-color .2s,box-shadow .2s}
.fld input:focus,.fld select:focus,.fld textarea:focus{outline:none;border-color:var(--cyan);box-shadow:0 0 0 3px rgba(52,230,255,.12)}
.fld textarea{resize:vertical;min-height:120px}
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:1rem}
.cinfo{display:flex;flex-direction:column;gap:1.2rem}
.cinfo .ci{display:flex;gap:.9rem;align-items:flex-start}
.cinfo .ci .ci-ico{width:42px;height:42px;border-radius:11px;display:grid;place-items:center;font-size:1.1rem;
  background:rgba(79,123,255,.1);border:1px solid var(--line-2);flex-shrink:0}
.cinfo .ci h5{font-size:.92rem;margin-bottom:.2rem}
.cinfo .ci p{font-size:.84rem;color:var(--txt2)}

/* ========== FOOTER ========== */
.ftr{background:var(--bg-2);border-top:1px solid var(--line);padding:3.4rem 0 0;margin-top:2rem}
.ftr h4{color:var(--txt);font-size:.78rem;text-transform:uppercase;letter-spacing:.1em;margin-bottom:.8rem}
.ftr-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:2rem;padding-bottom:2.4rem;border-bottom:1px solid var(--line)}
.ftr p.f-desc{color:var(--txt3);font-size:.84rem;margin-top:.9rem;line-height:1.7}
.fl{display:flex;flex-direction:column;gap:.5rem;font-size:.86rem;color:var(--txt2)}
.fl a:hover{color:var(--cyan)}
.ftr-bottom{display:flex;justify-content:space-between;flex-wrap:wrap;gap:.6rem;padding:1.4rem 0;font-size:.76rem;color:var(--txt3)}

/* notice strip */
.notice{font-size:.78rem;color:var(--txt3);text-align:center;padding:.7rem 1rem;border:1px dashed var(--line-2);border-radius:10px;
  background:rgba(79,123,255,.04);margin:1.4rem auto 0;max-width:760px}

/* ========== RESPONSIVE ========== */
@media(max-width:900px){
  .hero-grid,.prod{grid-template-columns:1fr;gap:2.4rem}
  .hero{padding:calc(var(--nav-h) + 2.5rem) 0 3.5rem}
  .hero-copy{max-width:none;padding-left:0}
  .hero-visual{min-height:340px;margin-top:1rem;padding-right:0}
  .prod:nth-child(even) .prod-visual{order:0}
  .ftr-grid{grid-template-columns:1fr 1fr}
}
/* 平板竖屏 / 折叠屏：7 项中文菜单收进汉堡 */
@media(max-width:820px){
  .menu-btn{display:block}
  .nav-links{position:fixed;top:var(--nav-h);left:0;right:0;background:rgba(5,6,15,.97);
    backdrop-filter:blur(16px);border-bottom:1px solid var(--line);padding:1.2rem 1.4rem;
    transform:translateY(-115%);opacity:0;pointer-events:none;transition:transform .32s,opacity .32s}
  .nav-links.open{transform:translateY(0);opacity:1;pointer-events:auto}
  .nav-links ul{flex-direction:column;gap:1rem;align-items:flex-start}
  .nav-links a.active::after,.nav-links a:not(.nav-cta):hover::after{display:none}
}
@media(max-width:680px){
  .ftr-grid{grid-template-columns:1fr}
  .contact-grid{grid-template-columns:1fr}
  .hero-stats{gap:1.4rem}
  .scene{grid-template-columns:1fr;gap:.8rem}
  .arch-row{flex-direction:column}
  /* 浮动信号卡收进可视区，避免负偏移贴边被裁 */
  .fc-1{top:2%;right:0}
  .fc-2{bottom:6%;left:0}
  .fc-3{bottom:30%;right:0}
  .float-card{font-size:.72rem;padding:.5rem .7rem}
  .sect{padding:4rem 0}
  .phero{padding:calc(var(--nav-h) + 3rem) 0 2.5rem}
}
/* 小屏手机 */
@media(max-width:380px){
  .ct{padding:0 1rem}
  .float-card{display:none}      /* 极窄屏隐藏装饰卡，让核心球居中干净 */
  .hero-stats{gap:1rem}
  .hero-stat .num{font-size:1.4rem}
  .card{padding:1.5rem 1.3rem}
}
@media(prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important}
  .reveal{opacity:1;transform:none}
}