/* ============================================================
   Jinwo Battery — Multilingual Corporate Website
   ============================================================ */

:root{
  --brand:#0b5cab;
  --brand-d:#084385;
  --brand-l:#e8f1fb;
  --accent:#12b76a;
  --accent-l:#e6f9f0;
  --ink:#0f172a;
  --ink-2:#334155;
  --ink-3:#64748b;
  --line:#e2e8f0;
  --bg:#ffffff;
  --bg-alt:#f7fafd;
  --radius:14px;
  --radius-lg:22px;
  --shadow-sm:0 1px 2px rgba(15,23,42,.06), 0 1px 3px rgba(15,23,42,.05);
  --shadow:0 4px 14px rgba(15,23,42,.07);
  --shadow-lg:0 18px 44px rgba(11,92,171,.14);
  --max:1200px;
  --ease:cubic-bezier(.4,0,.2,1);
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;
  font-family:'Manrope',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Helvetica Neue',Arial,'PingFang SC','Microsoft YaHei',sans-serif;
  color:var(--ink);
  background:var(--bg);
  line-height:1.65;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
ul{margin:0;padding:0;list-style:none}
h1,h2,h3,h4,h5{margin:0;line-height:1.25;font-weight:800;letter-spacing:-.02em}
p{margin:0 0 1em}
button{font-family:inherit;cursor:pointer;border:none;background:none}

.container{width:100%;max-width:var(--max);margin:0 auto;padding:0 24px}
.section{padding:96px 0}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:13px 26px;border-radius:11px;font-weight:700;font-size:.95rem;
  transition:all .25s var(--ease);white-space:nowrap;border:1.5px solid transparent;
}
.btn-primary{background:var(--brand);color:#fff;box-shadow:0 4px 14px rgba(11,92,171,.28)}
.btn-primary:hover{background:var(--brand-d);transform:translateY(-2px);box-shadow:0 8px 22px rgba(11,92,171,.34)}
.btn-ghost{background:rgba(255,255,255,.09);color:#fff;border-color:rgba(255,255,255,.35);backdrop-filter:blur(6px)}
.btn-ghost:hover{background:rgba(255,255,255,.18);border-color:rgba(255,255,255,.6)}
.btn-sm{padding:9px 18px;font-size:.87rem;border-radius:9px}
.btn-block{width:100%}

/* ---------- Header ---------- */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:100;
  transition:background .3s var(--ease),box-shadow .3s var(--ease),border-color .3s;
  border-bottom:1px solid transparent;
}
.site-header.scrolled{
  background:rgba(255,255,255,.93);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  box-shadow:0 1px 18px rgba(15,23,42,.08);
  border-bottom-color:var(--line);
}
.header-inner{display:flex;align-items:center;gap:28px;height:76px}

.brand{display:flex;align-items:center;gap:11px;flex-shrink:0}
.brand-mark{display:flex;border-radius:10px;overflow:hidden;box-shadow:0 2px 8px rgba(11,92,171,.25)}
.brand-text{display:flex;flex-direction:column;line-height:1.15}
.brand-text strong{font-size:1.22rem;letter-spacing:.06em;color:#fff;transition:color .3s}
.brand-text small{font-size:.62rem;color:rgba(255,255,255,.65);font-weight:500;transition:color .3s}
.site-header.scrolled .brand-text strong{color:var(--ink)}
.site-header.scrolled .brand-text small{color:var(--ink-3)}

.main-nav{display:flex;gap:2px;margin-left:auto}
.nav-link{
  padding:9px 11px;border-radius:9px;font-size:.88rem;font-weight:600;
  color:rgba(255,255,255,.86);transition:all .22s var(--ease);position:relative;white-space:nowrap;
}
.nav-link:hover{background:rgba(255,255,255,.13);color:#fff}
.site-header.scrolled .nav-link{color:var(--ink-2)}
.site-header.scrolled .nav-link:hover{background:var(--brand-l);color:var(--brand)}

.header-actions{display:flex;align-items:center;gap:12px}

/* Language switcher */
.lang-switch{position:relative}
.lang-current{
  display:flex;align-items:center;gap:7px;padding:9px 13px;border-radius:9px;
  font-size:.87rem;font-weight:600;color:rgba(255,255,255,.9);
  border:1px solid rgba(255,255,255,.28);transition:all .22s var(--ease);
}
.lang-current:hover{background:rgba(255,255,255,.13)}
.lang-current .chev{transition:transform .25s var(--ease)}
.lang-switch.open .lang-current .chev{transform:rotate(180deg)}
.site-header.scrolled .lang-current{color:var(--ink-2);border-color:var(--line);background:#fff}
.site-header.scrolled .lang-current:hover{background:var(--bg-alt);border-color:#cbd5e1}

.lang-menu{
  position:absolute;top:calc(100% + 9px);right:0;min-width:172px;
  background:#fff;border:1px solid var(--line);border-radius:13px;
  box-shadow:0 16px 40px rgba(15,23,42,.15);padding:7px;
  opacity:0;visibility:hidden;transform:translateY(-8px);
  transition:all .22s var(--ease);z-index:120;
}
.lang-switch.open .lang-menu{opacity:1;visibility:visible;transform:translateY(0)}
.lang-menu li{
  padding:9px 13px;border-radius:8px;font-size:.9rem;font-weight:600;
  color:var(--ink-2);cursor:pointer;transition:all .16s var(--ease);
}
.lang-menu li:hover{background:var(--brand-l);color:var(--brand)}
.lang-menu li.active{background:var(--brand);color:#fff}

.nav-toggle{display:none;flex-direction:column;gap:5px;padding:8px}
.nav-toggle span{display:block;width:22px;height:2px;background:#fff;border-radius:2px;transition:all .28s var(--ease)}
.site-header.scrolled .nav-toggle span{background:var(--ink)}

/* ---------- Hero ---------- */
.hero{
  position:relative;padding:150px 0 100px;overflow:hidden;
  background:linear-gradient(135deg,#062a54 0%,#0b5cab 55%,#1273cf 100%);
  color:#fff;
}
.hero-grid{
  position:absolute;inset:0;
  background-image:linear-gradient(rgba(255,255,255,.055) 1px,transparent 1px),
                   linear-gradient(90deg,rgba(255,255,255,.055) 1px,transparent 1px);
  background-size:56px 56px;
  mask-image:radial-gradient(ellipse 90% 70% at 50% 40%,#000 30%,transparent 100%);
  -webkit-mask-image:radial-gradient(ellipse 90% 70% at 50% 40%,#000 30%,transparent 100%);
}
.hero-glow{position:absolute;border-radius:50%;filter:blur(90px);opacity:.5}
.g1{width:520px;height:520px;background:#12b76a;top:-160px;right:-120px}
.g2{width:440px;height:440px;background:#3b9dff;bottom:-200px;left:-100px;opacity:.4}

.hero-inner{position:relative;z-index:2;display:grid;grid-template-columns:1.15fr .85fr;gap:64px;align-items:center}

.eyebrow{
  display:inline-block;font-size:.76rem;font-weight:700;letter-spacing:.09em;text-transform:uppercase;
  padding:7px 15px;border-radius:100px;margin-bottom:22px;
  background:rgba(255,255,255,.13);border:1px solid rgba(255,255,255,.24);color:#d6e9ff;
}
.hero h1{font-size:clamp(2.3rem,4.6vw,3.6rem);margin-bottom:20px;letter-spacing:-.03em}
.hero-sub{font-size:1.06rem;color:rgba(255,255,255,.83);max-width:600px;margin-bottom:34px;line-height:1.72}
.hero-btns{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:52px}

.hero-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;padding-top:30px;border-top:1px solid rgba(255,255,255,.17)}
.stat b{display:block;font-size:1.7rem;font-weight:800;color:#fff;letter-spacing:-.02em}
.stat span{display:block;font-size:.76rem;color:rgba(255,255,255,.66);line-height:1.4;margin-top:3px;font-weight:500}

/* Hero battery card */
.hero-visual{display:flex;justify-content:center}
.battery-card{
  width:100%;max-width:360px;background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.22);
  border-radius:var(--radius-lg);padding:26px;backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);
  box-shadow:0 24px 60px rgba(0,0,0,.28);animation:float 6s ease-in-out infinite;
}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-14px)}}
.bat-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:22px}
.bat-label{font-size:.82rem;font-weight:700;color:#d6e9ff;letter-spacing:.03em}
.bat-dot{width:9px;height:9px;border-radius:50%;background:var(--accent);box-shadow:0 0 0 5px rgba(18,183,106,.26);animation:pulse 2s infinite}
@keyframes pulse{0%,100%{box-shadow:0 0 0 5px rgba(18,183,106,.26)}50%{box-shadow:0 0 0 9px rgba(18,183,106,.09)}}
.bat-level{height:12px;border-radius:100px;background:rgba(255,255,255,.16);overflow:hidden;margin-bottom:11px}
.bat-level i{display:block;height:100%;border-radius:100px;background:linear-gradient(90deg,var(--accent),#5eead4);box-shadow:0 0 14px rgba(18,183,106,.6)}
.bat-meta{display:flex;justify-content:space-between;font-size:.76rem;color:rgba(255,255,255,.62);margin-bottom:22px;font-weight:600}
.bat-rows{display:flex;flex-direction:column;gap:9px;padding-top:18px;border-top:1px solid rgba(255,255,255,.16)}
.bat-row{display:flex;justify-content:space-between;font-size:.82rem;color:rgba(255,255,255,.72);font-weight:600}
.bat-row em{font-style:normal;color:#5eead4;font-weight:700}

/* ---------- Trust ---------- */
.trust{background:var(--bg-alt);padding:68px 0;border-bottom:1px solid var(--line)}
.section-kicker{text-align:center;font-size:.83rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-3);margin-bottom:38px}
.trust-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:26px}
.trust-item{text-align:center;padding:0 8px}
.ti-icon{
  width:50px;height:50px;border-radius:13px;background:var(--brand-l);color:var(--brand);
  display:flex;align-items:center;justify-content:center;margin:0 auto 15px;
}
.ti-icon svg{width:24px;height:24px}
.trust-item h3{font-size:.98rem;margin-bottom:7px;font-weight:700}
.trust-item p{font-size:.85rem;color:var(--ink-3);margin:0;line-height:1.55}

/* ---------- Section head ---------- */
.section-head{text-align:center;max-width:660px;margin:0 auto 54px}
.section-head h2{font-size:clamp(1.8rem,3.2vw,2.5rem);margin-bottom:14px}
.section-head p{color:var(--ink-3);font-size:1.02rem;margin:0}

/* ---------- Products ---------- */
.filter-bar{display:flex;justify-content:center;gap:10px;flex-wrap:wrap;margin-bottom:42px}
.filter-btn{
  padding:9px 20px;border-radius:100px;font-size:.88rem;font-weight:600;
  color:var(--ink-2);border:1.5px solid var(--line);background:#fff;transition:all .22s var(--ease);
}
.filter-btn:hover{border-color:var(--brand);color:var(--brand)}
.filter-btn.active{background:var(--brand);border-color:var(--brand);color:#fff;box-shadow:0 4px 14px rgba(11,92,171,.26)}

.prod-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.prod-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius-lg);overflow:hidden;
  display:flex;flex-direction:column;transition:all .3s var(--ease);box-shadow:var(--shadow-sm);
}
.prod-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg);border-color:#c7dcf3}
.prod-media{
  height:172px;display:flex;align-items:center;justify-content:center;color:#fff;
}
.prod-media svg{width:96px;height:96px;opacity:.94}
.m1{background:linear-gradient(135deg,#0b5cab,#1e88e5)}
.m2{background:linear-gradient(135deg,#0f9c63,#12b76a)}
.m3{background:linear-gradient(135deg,#134e8a,#2f7fc4)}
.m4{background:linear-gradient(135deg,#0a7a52,#14b87c)}
.m5{background:linear-gradient(135deg,#1c4b7d,#3b82c4)}
.m6{background:linear-gradient(135deg,#0d8f5e,#3aca89)}

.prod-body{padding:24px;display:flex;flex-direction:column;flex:1}
.prod-body h3{font-size:1.09rem;margin-bottom:11px}
.prod-body p{font-size:.89rem;color:var(--ink-3);line-height:1.68;flex:1;margin-bottom:18px}
.prod-foot{display:flex;justify-content:space-between;align-items:flex-end;gap:12px;padding-top:16px;border-top:1px solid var(--line)}
.spec{display:flex;flex-direction:column;gap:2px}
.spec small{font-size:.68rem;color:var(--ink-3);text-transform:uppercase;letter-spacing:.06em;font-weight:600}
.spec b{font-size:.84rem;color:var(--brand);font-weight:700}
.link-arrow{font-size:.85rem;font-weight:700;color:var(--brand);transition:gap .2s;display:inline-flex;align-items:center;gap:4px;white-space:nowrap}
.link-arrow::after{content:'→';transition:transform .22s var(--ease)}
.link-arrow:hover::after{transform:translateX(4px)}

/* ---------- About ---------- */
.about{background:var(--bg-alt)}
.about-inner{display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:start}
.about-copy h2{font-size:clamp(1.8rem,3.2vw,2.4rem);margin-bottom:20px}
.about-copy .lead{font-size:1.06rem;color:var(--ink-2);font-weight:600;line-height:1.7;margin-bottom:20px}
.about-copy p{font-size:.94rem;color:var(--ink-3);line-height:1.75}

.about-values{display:grid;grid-template-columns:1fr 1fr;gap:22px}
.value{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;transition:all .28s var(--ease)}
.value:hover{box-shadow:var(--shadow);border-color:#c7dcf3;transform:translateY(-3px)}
.v-num{font-size:.8rem;font-weight:800;color:var(--brand);letter-spacing:.08em;margin-bottom:11px}
.value h4{font-size:1rem;margin-bottom:8px}
.value p{font-size:.84rem;color:var(--ink-3);margin:0;line-height:1.6}

/* ---------- Certifications ---------- */
.cert-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.cert-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px 22px;
  text-align:center;transition:all .28s var(--ease);border-top:3px solid var(--brand);
}
.cert-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}
.cert-card b{display:block;font-size:1.02rem;color:var(--brand);margin-bottom:9px;font-weight:800;letter-spacing:.01em}
.cert-card span{font-size:.81rem;color:var(--ink-3);line-height:1.55;display:block}

/* ---------- OEM ---------- */
.oem{background:var(--bg-alt)}
.oem-intro{max-width:820px;margin:0 auto 48px;text-align:center}
.oem-intro p{font-size:.96rem;color:var(--ink-2);line-height:1.78}
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;position:relative}
.steps::before{
  content:'';position:absolute;top:29px;left:11%;right:11%;height:2px;
  background:repeating-linear-gradient(90deg,var(--line) 0 8px,transparent 8px 16px);z-index:0;
}
.step{position:relative;z-index:1;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px 22px;text-align:center;transition:all .28s var(--ease)}
.step:hover{box-shadow:var(--shadow-lg);transform:translateY(-4px);border-color:#c7dcf3}
.step-n{
  width:44px;height:44px;border-radius:50%;background:var(--brand);color:#fff;
  display:flex;align-items:center;justify-content:center;font-weight:800;font-size:1.05rem;
  margin:0 auto 16px;box-shadow:0 6px 18px rgba(11,92,171,.3);
}
.step h4{font-size:.96rem;margin-bottom:9px}
.step p{font-size:.83rem;color:var(--ink-3);margin:0;line-height:1.62}

/* ---------- Contact ---------- */
.contact-inner{display:grid;grid-template-columns:.85fr 1.15fr;gap:56px;align-items:start}
.contact-info{display:flex;flex-direction:column;gap:22px}
.ci-row{display:flex;flex-direction:column;gap:5px;padding-bottom:20px;border-bottom:1px solid var(--line)}
.ci-row:last-child{border-bottom:none}
.ci-label{font-size:.73rem;font-weight:700;text-transform:uppercase;letter-spacing:.09em;color:var(--ink-3)}
.ci-val{font-size:.95rem;color:var(--ink);font-weight:600;line-height:1.6}
.ci-val a{color:var(--brand);transition:color .2s}
.ci-val a:hover{color:var(--brand-d);text-decoration:underline}

.contact-form{background:var(--bg-alt);border:1px solid var(--line);border-radius:var(--radius-lg);padding:32px}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.contact-form label{display:flex;flex-direction:column;gap:7px;margin-bottom:16px}
.contact-form label span{font-size:.82rem;font-weight:700;color:var(--ink-2)}
.contact-form input,.contact-form textarea{
  width:100%;padding:12px 15px;border:1.5px solid var(--line);border-radius:10px;
  font-family:inherit;font-size:.92rem;color:var(--ink);background:#fff;
  transition:all .22s var(--ease);resize:vertical;
}
.contact-form input:focus,.contact-form textarea:focus{
  outline:none;border-color:var(--brand);box-shadow:0 0 0 3.5px rgba(11,92,171,.12);
}
.contact-form input:invalid:not(:placeholder-shown){border-color:#ef4444}
.form-note{font-size:.8rem;color:var(--ink-3);text-align:center;margin:14px 0 0}
.form-status{font-size:.88rem;text-align:center;margin-top:12px;font-weight:600;min-height:1.3em}
.form-status.ok{color:var(--accent)}
.form-status.err{color:#ef4444}

/* ---------- Footer ---------- */
.site-footer{background:#071b33;color:rgba(255,255,255,.7);padding:58px 0 0}
.footer-inner{display:grid;grid-template-columns:1.6fr 1fr 1.2fr;gap:48px;padding-bottom:44px}
.f-brand .brand-text strong{color:#fff}
.f-col h5{color:#fff;font-size:.86rem;text-transform:uppercase;letter-spacing:.1em;margin-bottom:18px;font-weight:700}
.f-col a,.f-col span{display:block;font-size:.88rem;color:rgba(255,255,255,.65);margin-bottom:11px;transition:color .2s;line-height:1.6}
.f-col a:hover{color:#fff}
.f-brand p{font-size:.87rem;line-height:1.72;margin:18px 0 0;color:rgba(255,255,255,.6);max-width:400px}
.brand-footer{margin-bottom:2px}
.footer-bottom{border-top:1px solid rgba(255,255,255,.1);padding:22px 0;font-size:.81rem;color:rgba(255,255,255,.5)}

/* ---------- Responsive ---------- */
@media (max-width:1080px){
  .hero-inner{grid-template-columns:1fr;gap:48px}
  .hero-visual{order:-1;max-width:420px;margin:0 auto}
  .prod-grid{grid-template-columns:repeat(2,1fr)}
  .cert-grid{grid-template-columns:repeat(3,1fr)}
  .steps{grid-template-columns:repeat(2,1fr)}
  .steps::before{display:none}
  .trust-grid{grid-template-columns:repeat(2,1fr);gap:34px}
}

@media (max-width:860px){
  .section{padding:68px 0}
  .header-inner{height:66px;gap:14px}
  .main-nav{
    position:fixed;top:66px;left:0;right:0;background:#fff;flex-direction:column;
    padding:18px 24px 26px;gap:4px;box-shadow:0 12px 30px rgba(15,23,42,.12);
    transform:translateY(-130%);transition:transform .34s var(--ease);border-bottom:1px solid var(--line);
  }
  .main-nav.open{transform:translateY(0)}
  .nav-link{color:var(--ink-2) !important;padding:13px 14px}
  .nav-link:hover{background:var(--brand-l)}
  .nav-toggle{display:flex}
  .header-cta{display:none}
  .hero{padding:120px 0 72px}
  .hero-stats{grid-template-columns:repeat(2,1fr);gap:22px}
  .about-inner{grid-template-columns:1fr;gap:40px}
  .contact-inner{grid-template-columns:1fr;gap:36px}
  .footer-inner{grid-template-columns:1fr;gap:34px}
  .brand-text small{display:none}
}

@media (max-width:620px){
  .container{padding:0 18px}
  .hero h1{font-size:2rem}
  .hero-sub{font-size:.96rem}
  .prod-grid,.cert-grid,.steps,.about-values,.form-row{grid-template-columns:1fr}
  .trust-grid{grid-template-columns:1fr;gap:28px}
  .filter-bar{gap:7px}
  .filter-btn{padding:8px 15px;font-size:.82rem}
  .battery-card{padding:22px}
  .contact-form{padding:24px}
  .hero-btns{flex-direction:column;align-items:stretch}
  .hero-btns .btn{width:100%}
  .lang-current{padding:8px 10px;font-size:.81rem}
  .lang-current #langLabel{max-width:62px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
}

@media (prefers-reduced-motion:reduce){
  *{animation:none !important;transition:none !important}
  html{scroll-behavior:auto}
}