/* ============================================================
   SAIMA Electric Vehicles — Global Stylesheet
   Pingxiang Saima Technology Co., Ltd
   ============================================================ */

:root{
  --red:#e02b2b; --red-dark:#b81f1f; --dark:#0d1a3a; --dark2:#16295c;
  --bg:#f6f7f9; --card:#ffffff; --text:#1c2430; --muted:#68737f;
  --line:#e4e8ec; --gold:#f5a623;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:"Segoe UI",system-ui,-apple-system,Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.6}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
.container{max-width:1200px;margin:0 auto;padding:0 20px}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}

/* ---------- Header ---------- */
header{position:sticky;top:0;z-index:100;background:rgba(13,26,58,.96);backdrop-filter:blur(8px);color:#fff}
.nav{display:flex;align-items:center;justify-content:space-between;height:68px}
.logo{display:flex;align-items:center;gap:10px}
.logo-badge{width:48px;height:48px;border-radius:12px;background:#fff;padding:5px;display:flex;align-items:center;justify-content:center;overflow:hidden;flex:none}
.logo-badge img{max-width:100%;max-height:100%;object-fit:contain;display:block}
.logo-name{font-weight:800;font-size:20px;letter-spacing:2px}
.logo-sub{font-size:11px;color:#9aa6b2;letter-spacing:.5px}
nav.menu{display:flex;gap:26px;font-size:14.5px;font-weight:600;align-items:center}
nav.menu a{color:#c9d2da;transition:.2s}
nav.menu a:hover,nav.menu a[aria-current="page"]{color:#fff}
nav.menu a[aria-current="page"]{border-bottom:2px solid var(--red);padding-bottom:2px}
.nav-cta{background:var(--red);padding:9px 18px;border-radius:8px;font-weight:700;font-size:14px;transition:.2s;color:#fff}
.nav-cta:hover{background:var(--red-dark)}
.burger{display:none;background:none;border:none;color:#fff;font-size:26px;cursor:pointer}

/* ---------- Buttons ---------- */
.btn{display:inline-flex;align-items:center;gap:8px;padding:14px 26px;border-radius:10px;font-weight:700;font-size:15.5px;transition:.2s}
.btn-red{background:var(--red);color:#fff}
.btn-red:hover{background:var(--red-dark)}
.btn-ghost{border:1.5px solid #3a444f;color:#e6ecf1}
.btn-ghost:hover{border-color:#6b7783}
.btn-wa{background:#25d366;color:#fff}
.btn-wa:hover{background:#1eb457}

/* ---------- Sections ---------- */
section{padding:80px 0}
.sec-head{text-align:center;max-width:760px;margin:0 auto 48px}
.sec-head .tag{color:var(--red);font-weight:800;font-size:13px;letter-spacing:2.5px;text-transform:uppercase}
.sec-head h2{font-size:36px;font-weight:900;margin:10px 0 14px}
.sec-head p{color:var(--muted)}

/* ---------- Breadcrumb ---------- */
.breadcrumb{background:#fff;border-bottom:1px solid var(--line);padding:14px 0;font-size:13.5px}
.breadcrumb ol{list-style:none;display:flex;flex-wrap:wrap;gap:8px;color:var(--muted)}
.breadcrumb li+li::before{content:"›";margin-right:8px;color:#c3cbd3}
.breadcrumb a{color:var(--muted)}
.breadcrumb a:hover{color:var(--red)}
.breadcrumb [aria-current="page"]{color:var(--text);font-weight:600}

/* ---------- Hero ---------- */
.hero{background:radial-gradient(1200px 600px at 75% -10%,rgba(64,120,235,.45),transparent 60%),linear-gradient(160deg,#16295c 0%,#0a1531 100%);color:#fff;padding:90px 0 110px;position:relative;overflow:hidden}
.hero::after{content:"";position:absolute;left:-120px;bottom:-160px;width:420px;height:420px;border-radius:50%;background:radial-gradient(circle,rgba(245,166,35,.18),transparent 70%)}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:40px;align-items:center;position:relative;z-index:1}
.kicker{display:inline-block;background:rgba(224,43,43,.18);border:1px solid rgba(224,43,43,.5);color:#ff8a8a;font-size:13px;font-weight:700;letter-spacing:2px;text-transform:uppercase;padding:6px 14px;border-radius:99px;margin-bottom:22px}
.hero h1{font-size:52px;line-height:1.12;font-weight:900;letter-spacing:-.5px}
.hero h1 span{color:var(--gold)}
.hero p.lead{margin:20px 0 30px;color:#b8c2cc;font-size:18px;max-width:560px}
.hero-btns{display:flex;gap:14px;flex-wrap:wrap}
.hero-stats{display:flex;gap:34px;margin-top:44px;flex-wrap:wrap}
.stat b{font-size:28px;color:#fff;display:block}
.stat span{font-size:13px;color:#8d99a5;text-transform:uppercase;letter-spacing:1px}
.hero-img{border-radius:18px;overflow:hidden;box-shadow:0 30px 70px rgba(0,0,0,.5);border:1px solid #2a323b}
.hero-img img{width:100%;height:auto;display:block}

/* compact hero for inner pages */
.hero.compact{padding:56px 0 64px}
.hero.compact h1{font-size:38px}

/* ---------- About ---------- */
.about{background:#fff}
.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:50px;align-items:center}
.about img{border-radius:14px;box-shadow:0 18px 45px rgba(16,20,24,.15)}
.about h2,.about h3{font-size:26px;font-weight:800;margin-bottom:16px}
.about p{color:var(--muted);margin-bottom:14px}
.feature-list{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:22px}
.feat{display:flex;gap:10px;align-items:flex-start;font-size:14.5px}
.feat .dot{flex:0 0 22px;height:22px;border-radius:50%;background:#fdecec;color:var(--red);display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:900;margin-top:2px}

/* ---------- Products grid ---------- */
.toolbar{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-bottom:34px}
.chip{display:inline-flex;align-items:center;padding:9px 20px;border-radius:99px;border:1.5px solid var(--line);background:#fff;font-weight:600;font-size:14px;cursor:pointer;transition:.2s;color:var(--muted);font-family:inherit}
.chip:hover{border-color:var(--red);color:var(--red)}
.chip.active{background:var(--red);border-color:var(--red);color:#fff}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(272px,1fr));gap:24px}
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;overflow:hidden;transition:.25s;display:flex;flex-direction:column}
.card:hover{transform:translateY(-5px);box-shadow:0 18px 40px rgba(16,20,24,.13);border-color:#d7dce2}
.card-img{position:relative;background:#eef1f4;aspect-ratio:4/3;display:flex;align-items:center;justify-content:center;overflow:hidden}
.card-img img{width:100%;height:100%;object-fit:cover;display:block}
.card-badge{position:absolute;top:12px;left:12px;background:rgba(13,26,58,.85);color:#fff;font-size:11.5px;font-weight:700;padding:4px 10px;border-radius:6px;letter-spacing:.5px}
.card-lithium{position:absolute;top:12px;right:12px;background:var(--gold);color:#fff;font-size:11.5px;font-weight:800;padding:4px 10px;border-radius:6px}
.card-body{padding:16px 18px 18px;display:flex;flex-direction:column;flex:1}
.card-code{font-size:12px;font-weight:800;color:var(--red);letter-spacing:1px}
.card-name{font-size:19px;font-weight:800;margin:2px 0 8px}
.card-name a:hover{color:var(--red)}
.card-specs{display:grid;grid-template-columns:1fr 1fr;gap:5px 10px;font-size:13px;color:var(--muted);margin-bottom:14px}
.card-specs b{color:var(--text);font-weight:700}
.card-foot{margin-top:auto;display:flex;align-items:center;justify-content:space-between;gap:10px}
.wa-mini{display:inline-flex;align-items:center;gap:6px;background:#25d366;color:#fff;font-size:12.5px;font-weight:700;padding:8px 13px;border-radius:8px;transition:.2s}
.wa-mini:hover{background:#1eb457}

/* ---------- Product detail ---------- */
.pd-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:44px;align-items:start}
.pd-media{background:#eef1f4;border-radius:16px;overflow:hidden;border:1px solid var(--line)}
.pd-media img{width:100%;height:auto;display:block}
.pd-code{color:var(--red);font-weight:800;font-size:13.5px;letter-spacing:1.5px;text-transform:uppercase}
.pd-title{font-size:36px;font-weight:900;margin:6px 0 6px;line-height:1.15}
.pd-sub{color:var(--muted);font-size:16px;margin-bottom:22px}
.pd-highlights{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:26px}
.pd-pill{background:#fdecec;color:var(--red-dark);font-size:13px;font-weight:700;padding:7px 14px;border-radius:99px}
.pd-pill.gold{background:#fdf3e0;color:#8a6410}
.spec-table{width:100%;border-collapse:collapse;font-size:14.5px;margin-bottom:26px;background:#fff;border:1px solid var(--line);border-radius:12px;overflow:hidden}
.spec-table td{padding:11px 16px;border-bottom:1px solid var(--line)}
.spec-table tr:last-child td{border-bottom:none}
.spec-table td:first-child{color:var(--muted);width:44%}
.spec-table td:last-child{font-weight:600}
.pd-btns{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:22px}
.pd-notes{background:#fff8e8;border:1px solid #f2e3bd;border-radius:10px;padding:16px 20px;font-size:14px;color:#7a5b12}

/* ---------- Prose / content pages ---------- */
.prose{max-width:820px;margin:0 auto}
.prose h2{font-size:26px;font-weight:800;margin:38px 0 14px}
.prose h3{font-size:19px;font-weight:800;margin:26px 0 10px}
.prose p{color:var(--muted);margin-bottom:14px}
.prose ul,.prose ol{color:var(--muted);margin:0 0 16px 22px}
.prose li{margin-bottom:8px}
.prose a{color:var(--red);font-weight:600}
.prose strong{color:var(--text)}
.prose table{width:100%;border-collapse:collapse;font-size:14.5px;margin:18px 0 24px;background:#fff;border:1px solid var(--line);border-radius:12px;overflow:hidden}
.prose th{background:#f2f5f8;color:var(--muted);text-align:left;padding:11px 16px;font-size:12px;letter-spacing:.6px;text-transform:uppercase}
.prose td{padding:11px 16px;border-top:1px solid #eef1f4}
.prose .note{background:#fff8e8;border:1px solid #f2e3bd;border-radius:10px;padding:16px 20px;font-size:14px;color:#7a5b12}

/* ---------- Battery tables ---------- */
.bat-grid{display:grid;grid-template-columns:1fr 1fr;gap:28px}
.bat-card{background:#fff;border:1px solid var(--line);border-radius:14px;overflow:hidden;box-shadow:0 6px 18px rgba(16,20,24,.06)}
.bat-card h3{margin:0;padding:16px 22px;font-size:17.5px;color:#fff;letter-spacing:.3px;font-weight:800}
.bat-lead h3{background:linear-gradient(135deg,#5b7fb9,#47679c)}
.bat-li h3{background:linear-gradient(135deg,#e8365d,#c9204a)}
.bat-card .bat-sub{padding:12px 22px 0;color:var(--muted);font-size:13.5px}
table.bat{width:100%;border-collapse:collapse;margin-top:10px;font-size:14.5px}
table.bat th{background:#f2f5f8;color:var(--muted);text-align:left;padding:10px 22px;font-size:12px;letter-spacing:.6px;text-transform:uppercase}
table.bat td{padding:11px 22px;border-top:1px solid #eef1f4}
table.bat td.bp{font-weight:800;color:var(--red);white-space:nowrap}
table.bat td.bc{font-weight:700;white-space:nowrap}
table.bat tr:hover td{background:#fafbfd}
.bat-note{margin-top:24px;background:#fff8e8;border:1px solid #f2e3bd;border-radius:10px;padding:14px 20px;font-size:14px;color:#7a5b12}

/* ---------- Contact ---------- */
.contact{background:linear-gradient(160deg,#16295c,#0a1531);color:#fff}
.contact-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:22px;margin-top:40px}
.c-box{background:#1a2129;border:1px solid #2a323b;border-radius:14px;padding:26px}
.c-box .ic{width:44px;height:44px;border-radius:10px;background:rgba(224,43,43,.18);display:flex;align-items:center;justify-content:center;font-size:20px;margin-bottom:14px}
.c-box h3,.c-box h4{font-size:16px;margin-bottom:6px;color:#fff;font-weight:800}
.c-box p{color:#a7b2bd;font-size:14.5px;word-break:break-word}
.c-box a.hl{color:#5ee38f;font-weight:700}
.contact-note{margin-top:30px;background:rgba(245,166,35,.1);border:1px solid rgba(245,166,35,.35);border-radius:12px;padding:18px 22px;color:#f3d9a4;font-size:14.5px}

/* ---------- Inquiry form ---------- */
.form-wrap{background:#fff;border:1px solid var(--line);border-radius:14px;padding:26px;margin-top:24px}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.form-grid .full{grid-column:1/-1}
.field label{display:block;font-size:13px;font-weight:700;color:var(--text);margin-bottom:6px}
.field .req{color:var(--red)}
.field input,.field select,.field textarea{width:100%;padding:12px 14px;border:1.5px solid var(--line);border-radius:9px;font-size:14.5px;font-family:inherit;color:var(--text);background:#fff;transition:.2s}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--red);box-shadow:0 0 0 3px rgba(224,43,43,.1)}
.field textarea{min-height:110px;resize:vertical}
.form-hint{font-size:12.5px;color:var(--muted);margin-top:6px}
.form-msg{margin-top:16px;padding:13px 18px;border-radius:9px;font-size:14px;display:none}
.form-msg.ok{background:#e8f8ef;border:1px solid #b6e6cc;color:#1c6b40;display:block}
.form-msg.err{background:#fdecec;border:1px solid #f5c2c2;color:#a32020;display:block}

/* ---------- FAQ / accordion ---------- */
.faq{max-width:860px;margin:0 auto}
.faq details{background:#fff;border:1px solid var(--line);border-radius:12px;margin-bottom:12px;overflow:hidden}
.faq summary{cursor:pointer;padding:18px 22px;font-weight:700;font-size:15.5px;list-style:none;display:flex;justify-content:space-between;gap:14px;align-items:center}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-size:22px;color:var(--red);font-weight:400;flex:none;line-height:1}
.faq details[open] summary::after{content:"−"}
.faq .faq-body{padding:0 22px 20px;color:var(--muted);font-size:14.5px}
.faq .faq-body p{margin-bottom:10px}
.faq .faq-body ul{margin:0 0 10px 20px}

/* ---------- CTA band ---------- */
.cta-band{background:linear-gradient(160deg,#16295c,#0a1531);color:#fff;text-align:center;padding:64px 0}
.cta-band h2{font-size:30px;font-weight:900;margin-bottom:12px}
.cta-band p{color:#b8c2cc;margin-bottom:26px;max-width:640px;margin-left:auto;margin-right:auto}
.cta-band .btns{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}

/* ---------- Footer ---------- */
footer{background:#0a1128;color:#8b97b8;padding:44px 0 30px;font-size:13.5px}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:32px;margin-bottom:30px}
.foot-grid h4{color:#fff;font-size:14px;font-weight:800;margin-bottom:12px;letter-spacing:.5px}
.foot-grid ul{list-style:none}
.foot-grid li{margin-bottom:8px}
.foot-grid a{color:#8b97b8;transition:.2s}
.foot-grid a:hover{color:#fff}
.foot-bottom{border-top:1px solid #1c2740;padding-top:22px;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;align-items:center}
.foot-brand{display:flex;align-items:center;gap:10px;margin-bottom:14px}

/* ---------- Float contact rail (right edge) ---------- */
.float-contact{position:fixed;right:0;top:50%;transform:translateY(-50%);z-index:150;display:flex;flex-direction:column;gap:8px}
.fc-item{display:flex;align-items:center;justify-content:flex-start;width:46px;height:46px;border-radius:10px 0 0 10px;background:#1b3a8f;color:#fff;text-decoration:none;overflow:hidden;white-space:nowrap;box-shadow:0 4px 14px rgba(13,26,58,.3);transition:width .25s ease,background .2s}
.fc-item:hover{width:auto;padding-right:16px;color:#fff}
.fc-item svg{flex:0 0 46px;width:46px;height:46px;padding:13px;display:block}
.fc-item .fc-txt{font-size:13px;font-weight:600;line-height:1.25;padding-right:2px}
.fc-item .fc-txt b{display:block;font-size:11px;font-weight:600;opacity:.75;letter-spacing:.3px}
.fc-wa{background:#25d366}
.fc-wechat{background:#07c160}
.fc-zalo{background:#0068ff}
.fc-mail{background:#c0392b}
.fc-top{background:#0d1a3a;width:46px;height:36px;opacity:0;pointer-events:none;transition:opacity .2s,width .25s}
.fc-top.show{opacity:1;pointer-events:auto}
.fc-top svg{flex:0 0 46px;width:46px;height:36px;padding:9px 13px}

/* Float WhatsApp -- legacy round bubble, hidden now the rail exists */
.float-wa{display:none}

/* ---------- Responsive ---------- */
@media(max-width:960px){
  .float-contact{gap:6px}
  .fc-item,.fc-item:hover{width:42px;padding-right:0}
  .fc-item svg{flex:0 0 42px;width:42px;height:42px;padding:11px}
  .fc-item .fc-txt{display:none}
  .hero-grid,.about-grid,.pd-grid{grid-template-columns:1fr}
  .hero h1{font-size:38px}
  .hero.compact h1{font-size:30px}
  .pd-title{font-size:28px}
  .contact-grid{grid-template-columns:1fr}
  nav.menu{display:none}
  .burger{display:block}
  nav.menu.open{display:flex;position:absolute;top:68px;left:0;right:0;background:#142449;flex-direction:column;padding:20px;gap:16px;align-items:flex-start}
  .bat-grid{grid-template-columns:1fr}
  .form-grid{grid-template-columns:1fr}
  .foot-grid{grid-template-columns:1fr 1fr}
  section{padding:56px 0}
  .sec-head h2{font-size:28px}
}
@media(max-width:560px){
  .foot-grid{grid-template-columns:1fr}
  .grid{grid-template-columns:1fr}
}

/* ---------- Language switcher ---------- */
.lang-switch{position:relative;display:inline-block}.lang-btn{background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.22);color:#fff;
  font:inherit;font-size:13px;font-weight:600;padding:8px 12px;border-radius:8px;cursor:pointer;
  display:inline-flex;align-items:center;gap:6px;white-space:nowrap;transition:.2s}
.lang-btn:hover{background:rgba(255,255,255,.16);border-color:rgba(255,255,255,.4)}
.lang-btn .caret{font-size:9px;opacity:.8}
.lang-menu{position:absolute;top:calc(100% + 6px);right:0;min-width:160px;background:#fff;
  border-radius:10px;box-shadow:0 12px 32px rgba(13,26,58,.22);list-style:none;margin:0;padding:6px;
  display:none;z-index:200}
.lang-switch.open .lang-menu{display:block}
.lang-menu li{margin:0}
.lang-menu a{display:block;padding:9px 12px;border-radius:7px;color:var(--dark);
  font-size:14px;font-weight:600;text-decoration:none;transition:.15s}
.lang-menu a:hover{background:#f2f4f8}
.lang-menu a[aria-current="true"]{background:var(--red);color:#fff}
@media(max-width:960px){
  .lang-switch{width:100%}
  .lang-btn{width:100%;justify-content:space-between}
  .lang-menu{position:static;display:none;box-shadow:none;border:1px solid #e6e9ef;margin-top:6px;width:100%}
  .lang-switch.open .lang-menu{display:block}
}

/* ---------- Bilingual product names (English + Chinese) ---------- */
.card-name .cn{display:block;font-size:13px;font-weight:600;color:var(--muted);
  letter-spacing:.5px;margin-top:3px;line-height:1.35}
.pd-title .cn{display:block;font-size:.52em;font-weight:700;color:var(--muted);
  letter-spacing:2px;margin-top:8px;line-height:1.3}
.pd-sub .cn-inline{font-weight:700;color:var(--dark);white-space:nowrap}
.pd-caption .cn-inline{color:var(--muted);font-weight:600}
/* CJK stack so Chinese renders consistently across platforms */
.card-name .cn,.pd-title .cn,.pd-sub .cn-inline,.pd-caption .cn-inline,
.opt-cn,.spec-table td .cn-inline{
  font-family:"Microsoft YaHei","PingFang SC","Hiragino Sans GB","Noto Sans SC",
    "Source Han Sans SC","WenQuanYi Micro Hei",sans-serif}
.opt-cn{color:var(--muted);font-weight:600}
/* a11y: keep the Vietnamese/Chinese suffix readable but not dominant */
.sr-only-cn{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}