:root{
  --bg:#f4f8fb;
  --bg-alt:#eaf3f8;
  --text:#193248;
  --muted:#5c7183;
  --card:#ffffff;
  --border:#cfdfe9;
  --primary:#0d789c;
  --primary-2:#075a78;
  --accent:#27bcd2;
  --shadow:0 14px 30px rgba(14,73,103,.10);
  --radius:14px;
}

*{ box-sizing:border-box; }
html,body{ margin:0; padding:0; color:var(--text); background:var(--bg); font-family: -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",Arial,sans-serif; }
a{ color:inherit; text-decoration:none; }
a:hover{ color:var(--primary); }

.container{ width:min(1120px, calc(100% - 32px)); margin:0 auto; }

.muted{ color:var(--muted); }
.small{ font-size:12px; }

.badge{
  display:inline-flex;
  align-items:center;
  padding:2px 10px;
  border-radius:999px;
  background:rgba(13,120,156,.12);
  color:var(--primary);
  font-weight:600;
  margin-right:8px;
  font-size:12px;
}

.dot{ display:inline-block; width:8px; height:8px; border-radius:999px; background:var(--primary); margin-right:10px; vertical-align:middle; }

/* Topbar */
.topbar{ background:var(--bg-alt); border-bottom:1px solid var(--border); }
.topbar__inner{ display:flex; align-items:center; justify-content:space-between; padding:10px 0; gap:12px; }
.topbar__text{ font-size:13px; color:var(--muted); line-height:1.4; }
.topbar__close{
  border:1px solid var(--border);
  background:#fff;
  border-radius:10px;
  width:34px;height:34px;
  cursor:pointer;
  font-size:18px;
}

/* Header */
.header{ position:sticky; top:0; z-index:50; background:rgba(255,255,255,.92); backdrop-filter: blur(10px); border-bottom:1px solid var(--border); }
.header__inner{ display:flex; align-items:center; justify-content:space-between; padding:14px 0; gap:12px; }

.brand{ display:flex; align-items:center; gap:10px; }
.brand__logo{
  width:214px;height:60px;border-radius:0;
  display:block;object-fit:contain;
  background:transparent;
}
.brand__name{ font-weight:800; letter-spacing:.3px; }

/* Nav */
.nav{ position:relative; }
.nav__toggle{
  display:none;
  border:1px solid var(--border);
  background:#fff;
  border-radius:12px;
  padding:10px;
  cursor:pointer;
}
.nav__toggle span{ display:block; width:22px; height:2px; background:var(--text); margin:4px 0; opacity:.8; }

.nav__list{ list-style:none; margin:0; padding:0; display:flex; align-items:center; gap:18px; }
.nav__link{ font-size:14px; color:var(--muted); }
.nav__link--cta{
  font-size:14px;
  padding:10px 14px;
  border-radius:999px;
  background:var(--primary);
  color:#fff;
  font-weight:700;
}
.nav__link--cta:hover{ background:var(--primary-2); color:#fff; }

/* Hero */
.hero{ padding:52px 0 24px; }
.hero__inner{ display:grid; grid-template-columns: 1.2fr .8fr; gap:24px; align-items:start; }
.hero h1{ margin:0 0 10px; font-size:36px; line-height:1.18; letter-spacing:.2px; }
.hero__subtitle{ margin:0 0 18px; color:var(--muted); font-size:16px; line-height:1.7; }
.hero__highlights{ display:grid; grid-template-columns: repeat(3, 1fr); gap:12px; margin:18px 0 18px; }
.highlight{ background:var(--bg-alt); border:1px solid var(--border); border-radius:var(--radius); padding:12px; }
.highlight__title{ font-weight:800; margin-bottom:6px; }
.highlight__desc{ color:var(--muted); font-size:13px; line-height:1.5; }
.hero__actions{ display:flex; gap:12px; flex-wrap:wrap; margin:12px 0 14px; }
.hero__trust{ color:var(--muted); font-size:13px; line-height:1.7; }

.card{ background:var(--card); border:1px solid var(--border); border-radius:var(--radius); padding:16px; box-shadow: var(--shadow); }
.card--soft{ background:linear-gradient(180deg, #ffffff, #f8fafc); }
.card__kicker{ color:var(--primary); font-weight:700; font-size:13px; }
.card__title{ margin:8px 0 8px; font-size:18px; }
.card__desc{ margin:0 0 12px; color:var(--muted); line-height:1.7; }

.quicklinks{ display:flex; flex-direction:column; gap:10px; margin:10px 0 8px; }
.quicklinks__item{
  padding:10px 12px;
  border:1px solid var(--border);
  border-radius:12px;
  background:#fff;
  color:var(--text);
}
.quicklinks__item:hover{ border-color: rgba(13,120,156,.45); }

/* Sections */
.section{ padding:44px 0; }
.section--alt{ background:var(--bg-alt); border-top:1px solid var(--border); border-bottom:1px solid var(--border); }
.section__head h2{ margin:0 0 10px; font-size:26px; }
.section__desc{ margin:0 0 18px; color:var(--muted); line-height:1.75; }

/* Grid helpers */
.grid{ display:grid; gap:14px; }
.grid--3{ grid-template-columns: repeat(3, 1fr); }
.grid--4{ grid-template-columns: repeat(4, 1fr); }

.feature{
  background:#fff;
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:16px;
  box-shadow: var(--shadow);
}
.feature__icon{ font-size:20px; margin-bottom:8px; }
.feature h3{ margin:0 0 8px; font-size:16px; }
.feature p{ margin:0; color:var(--muted); line-height:1.7; font-size:14px; }

.mini{
  background:#fff;
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:14px;
}
.mini__title{ font-weight:800; margin-bottom:6px; }
.mini__desc{ color:var(--muted); font-size:13px; line-height:1.6; }

/* Steps */
.steps{ list-style:none; padding:0; margin:0; display:grid; gap:12px; }
.step{
  display:flex; gap:12px; align-items:flex-start;
  padding:14px;
  background:#fff;
  border:1px solid var(--border);
  border-radius:var(--radius);
}
.step__index{
  width:34px;height:34px;border-radius:12px;
  background:rgba(13,120,156,.12);
  color:var(--primary);
  display:grid; place-items:center;
  font-weight:800;
}
.step__title{ font-weight:800; margin-bottom:6px; }
.step__desc{ color:var(--muted); line-height:1.7; font-size:14px; }

/* Stats */
.stats{ display:grid; grid-template-columns: repeat(4, 1fr); gap:12px; margin-top:18px; }
.stat{
  background:#fff;
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:14px;
}
.stat__value{ font-weight:900; color:var(--primary); margin-bottom:6px; }
.stat__label{ color:var(--muted); font-size:13px; }

/* Articles */
.article-grid{ display:grid; grid-template-columns: repeat(3, 1fr); gap:14px; margin:14px 0 18px; }
.article-card{
  display:block;
  background:#fff;
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:16px;
  box-shadow:var(--shadow);
}
.article-card__title{ font-weight:900; margin-bottom:8px; line-height:1.35; }
.article-card__desc{ color:var(--muted); line-height:1.7; font-size:14px; }

/* FAQ */
.faq{ display:grid; gap:10px; margin-top:14px; }
.faq__item{
  background:#fff;
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:12px 14px;
}
.faq__q{ cursor:pointer; font-weight:800; }
.faq__a{ color:var(--muted); line-height:1.75; margin-top:10px; }

/* Contact */
.contact{ display:grid; grid-template-columns: 1fr .85fr; gap:16px; align-items:start; }
.form{
  background:#fff;
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:16px;
  box-shadow: var(--shadow);
}
.form__row{ margin-bottom:12px; }
.form__label{ display:block; font-weight:800; margin-bottom:6px; font-size:13px; }
.form__control{
  width:100%;
  padding:10px 12px;
  border:1px solid var(--border);
  border-radius:12px;
  outline:none;
  font-size:14px;
}
.form__control:focus{ border-color: rgba(13,120,156,.45); box-shadow: 0 0 0 4px rgba(13,120,156,.10); }
.form__actions{ display:flex; gap:10px; margin-top:8px; flex-wrap:wrap; }
.form__hint{ margin-top:10px; color:var(--muted); font-size:12px; line-height:1.7; }

.aside__card{
  background:#fff;
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:16px;
  box-shadow: var(--shadow);
  margin-bottom:12px;
}
.list{ margin:10px 0 0; padding-left:18px; color:var(--muted); line-height:1.9; }

/* Buttons */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  border-radius:999px;
  padding:11px 16px;
  border:1px solid var(--border);
  background:#fff;
  cursor:pointer;
  font-weight:800;
}
.btn--primary{ background:var(--primary); border-color:var(--primary); color:#fff; }
.btn--primary:hover{ background:var(--primary-2); border-color:var(--primary-2); }
.btn--ghost:hover{ border-color: rgba(13,120,156,.45); }

/* Footer */
.footer{ padding:34px 0 18px; background:#0b1220; color:#e5e7eb; }
.footer a{ color:#e5e7eb; opacity:.92; }
.footer a:hover{ color:#fff; opacity:1; }
.footer__inner{ display:grid; grid-template-columns: 1.2fr .8fr; gap:16px; padding-bottom:14px; border-bottom:1px solid rgba(255,255,255,.10); }
.brand--footer .brand__logo{ background:rgba(255,255,255,.10); color:#fff; }
.brand--footer .brand__name{ color:#fff; }
.footer__cols{ display:grid; grid-template-columns: repeat(3, 1fr); gap:12px; }
.footer__title{ font-weight:900; margin-bottom:8px; }
.footer__col{ display:flex; flex-direction:column; gap:8px; color:#cbd5e1; }
.footer__bottom{ display:flex; align-items:center; justify-content:space-between; gap:12px; padding-top:12px; color:#cbd5e1; font-size:13px; }
.footer .muted{ color:#cbd5e1; opacity:.92; }

/* Toast */
.toast{
  position: fixed;
  right: 16px;
  bottom: 16px;
  max-width: 360px;
  padding: 12px 14px;
  border-radius: 14px;
  background: #111827;
  color: #fff;
  box-shadow: var(--shadow);
  opacity: 0;
  transform: translateY(10px);
  pointer-events: none;
  transition: all .2s ease;
}
.toast.show{
  opacity: 1;
  transform: translateY(0);
}

/* Responsive */
@media (max-width: 980px){
  .hero__inner{ grid-template-columns: 1fr; }
  .grid--3{ grid-template-columns: 1fr; }
  .grid--4{ grid-template-columns: 1fr 1fr; }
  .article-grid{ grid-template-columns: 1fr; }
  .contact{ grid-template-columns: 1fr; }
  .stats{ grid-template-columns: 1fr 1fr; }
  .nav__toggle{ display:inline-block; }
  .nav__list{
    display:none;
    position:absolute;
    right:0; top:52px;
    width: min(320px, calc(100vw - 32px));
    background:#fff;
    border:1px solid var(--border);
    border-radius:16px;
    padding:10px;
    box-shadow: var(--shadow);
    flex-direction:column;
    align-items:stretch;
    gap:8px;
  }
  .nav__list.open{ display:flex; }
  .nav__link--cta{ text-align:center; }
}

/* ========== Technology Efficiency Theme ========== */
.theme-tech-efficiency{
  background:var(--bg);
}
.theme-tech-efficiency .topbar{
  background:#e5f2f8;
  border-color:#cbdfe9;
}
.theme-tech-efficiency .badge{
  background:var(--primary);
  color:#fff;
  border-radius:5px;
}
.theme-tech-efficiency .header{
  background:rgba(249,252,254,.96);
  box-shadow:0 8px 28px rgba(14,73,103,.08);
}
.theme-tech-efficiency .nav__link--cta{
  border-radius:8px;
}
.theme-tech-efficiency .hero{
  position:relative;
  overflow:hidden;
  padding:64px 0 56px;
  background:
    linear-gradient(90deg,rgba(13,120,156,.055) 1px,transparent 1px),
    linear-gradient(0deg,rgba(13,120,156,.055) 1px,transparent 1px),
    linear-gradient(135deg,#f0f8fc 0%,#e2f2f8 62%,#d5ebf4 100%);
  background-size:36px 36px,36px 36px,auto;
  border-bottom:1px solid #c4dfe9;
}
.theme-tech-efficiency .hero::before,
.theme-tech-efficiency .hero::after{
  content:"";
  position:absolute;
  pointer-events:none;
}
.theme-tech-efficiency .hero::before{
  width:240px;height:240px;right:-70px;top:-112px;
  border:2px solid rgba(13,120,156,.18);
  transform:rotate(45deg);
}
.theme-tech-efficiency .hero::after{
  width:128px;height:128px;left:-40px;bottom:-62px;
  border:1px solid rgba(39,188,210,.32);
  background:rgba(39,188,210,.055);
  transform:rotate(22deg);
}
.theme-tech-efficiency .hero__inner{ position:relative;z-index:1;align-items:center; }
.theme-tech-efficiency .hero h1{ color:#12374f;font-size:42px;letter-spacing:-.025em; }
.theme-tech-efficiency .highlight{
  background:rgba(255,255,255,.91);
  border-color:#c8deea;
  box-shadow:inset 4px 0 var(--accent);
}
.theme-tech-efficiency .card,
.theme-tech-efficiency .feature,
.theme-tech-efficiency .mini,
.theme-tech-efficiency .step,
.theme-tech-efficiency .stat,
.theme-tech-efficiency .article-card,
.theme-tech-efficiency .faq__item{
  border-color:#cfdee8;
  box-shadow:var(--shadow);
}
.theme-tech-efficiency .card--soft{
  background:linear-gradient(155deg,#ffffff,#eef8fc);
  border-top:4px solid var(--accent);
}
.theme-tech-efficiency .quicklinks__item:hover{
  border-color:var(--primary);
  background:#edf8fb;
}
.theme-tech-efficiency .section__head{ max-width:760px; }
.theme-tech-efficiency .section__head h2{ color:#153d55; }
.theme-tech-efficiency .section__head h2::after{
  content:"";
  display:block;
  width:76px;height:4px;
  margin-top:12px;
  border-radius:3px;
  background:linear-gradient(90deg,var(--primary),var(--accent));
}
.section--products{ background:#f7fbfd; }
.product-grid{
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  gap:18px;
}
.theme-tech-efficiency .product-card{
  position:relative;
  display:block;
  overflow:hidden;
  background:#fff;
  border:1px solid #cfdee8;
  border-radius:14px;
  box-shadow:0 12px 27px rgba(14,73,103,.07);
  transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease;
}
.theme-tech-efficiency .product-card::before{
  content:"";
  position:absolute;top:0;left:0;z-index:2;
  width:64px;height:3px;background:var(--accent);
}
.theme-tech-efficiency .product-card:hover{
  transform:translateY(-4px);
  border-color:var(--primary);
  box-shadow:0 18px 36px rgba(14,73,103,.16);
}
.product-img{
  aspect-ratio:1;
  padding:14px;
  background:linear-gradient(145deg,#f4f9fc,#eaf3f8);
}
.product-img img{ width:100%;height:100%;display:block;object-fit:contain;border-radius:10px; }
.product-info{ padding:14px; }
.product-name{ min-height:44px;font-weight:750;line-height:1.5;color:#17384e; }
.product-meta{ display:flex;justify-content:space-between;align-items:end;gap:8px;margin-top:10px; }
.product-price{ color:var(--primary);font-size:18px;font-weight:900; }
.product-shipping{ color:var(--muted);font-size:11px;text-align:right; }
.product-tag{
  position:absolute;left:10px;top:10px;z-index:3;
  padding:4px 10px;border-radius:5px;
  background:var(--primary);color:#fff;font-size:11px;font-weight:800;
}
.theme-tech-efficiency .feature__icon,
.theme-tech-efficiency .step__index{
  background:#e2f5f9;
  color:var(--primary);
  border-radius:7px;
}
.theme-tech-efficiency .footer{ background:#102b3d; }
.brand--footer .brand__logo{ background:transparent; filter:brightness(0) invert(1); }

@media (max-width: 680px){
  .container{ width:min(100% - 24px,1120px); }
  .brand__logo{ width:176px;height:50px; }
  .theme-tech-efficiency .hero{ padding:42px 0 34px; }
  .theme-tech-efficiency .hero h1{ font-size:30px; }
  .hero__highlights{ grid-template-columns:1fr; }
  .product-grid{ grid-template-columns:repeat(2,minmax(0,1fr));gap:10px; }
  .product-img{ padding:8px; }
  .product-info{ padding:10px; }
  .product-name{ min-height:40px;font-size:13px; }
  .product-meta{ display:block; }
  .product-price{ display:block;font-size:16px; }
  .product-shipping{ display:block;margin-top:5px;text-align:left;font-size:10px; }
  .article-page .header__inner{ align-items:center; }
  .article-page .nav__list{
    display:flex;
    position:static;
    width:auto;
    padding:0;
    border:0;
    box-shadow:none;
    background:transparent;
    gap:6px;
    flex-direction:row;
    align-items:center;
  }
  .article-page .nav__link{ font-size:12px;white-space:nowrap; }
  .article-page .nav__link--cta{ display:block;padding:8px 11px;font-size:12px; }
}