/* ============ ELEHPD Corporate Website ============ */
:root {
  --primary: #0b3d91;      /* deep blue */
  --primary-dark: #082b66;
  --accent: #f5a623;       /* electric amber */
  --dark: #101820;
  --gray: #5a6570;
  --light: #f5f7fa;
  --white: #ffffff;
  --radius: 10px;
  --shadow: 0 8px 30px rgba(11, 61, 145, .10);
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: "Segoe UI", "Helvetica Neue", Arial, "PingFang SC", sans-serif;
  color: var(--dark);
  line-height: 1.7;
  background: var(--white);
}
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }
.container { width: min(1180px, 92%); margin: 0 auto; }

/* ---------- Top bar ---------- */
.topbar {
  background: var(--primary-dark);
  color: #cdd8ea;
  font-size: 13px;
  padding: 6px 0;
}
.topbar .container { display: flex; justify-content: space-between; align-items: center; }
.topbar a { color: var(--accent); }

/* ---------- Header ---------- */
header {
  position: sticky; top: 0; z-index: 100;
  background: var(--white);
  box-shadow: 0 2px 12px rgba(0,0,0,.07);
}
.nav-wrap { display: flex; align-items: center; justify-content: space-between; height: 76px; }
.logo { display: flex; align-items: center; gap: 10px; }
.logo-mark {
  width: 44px; height: 44px; border-radius: 8px;
  background: linear-gradient(135deg, var(--primary), #1e6fd9);
  color: #fff; display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 20px; letter-spacing: -1px;
}
.logo-text { font-size: 24px; font-weight: 800; color: var(--primary); letter-spacing: 1px; }
.logo-text span { color: var(--accent); }
nav ul { display: flex; gap: 8px; }
nav a {
  padding: 10px 18px; font-weight: 600; font-size: 15px; color: #26303a;
  border-radius: 6px; transition: all .2s;
}
nav a:hover { color: var(--primary); background: var(--light); }
nav a.active { color: var(--primary); position: relative; }
nav a.active::after {
  content: ""; position: absolute; left: 18px; right: 18px; bottom: 2px;
  height: 3px; background: var(--accent); border-radius: 2px;
}
.nav-toggle { display: none; background: none; border: none; font-size: 26px; cursor: pointer; color: var(--primary); }
nav ul li.lang a {
  border: 1.5px solid var(--primary); color: var(--primary);
  padding: 8px 16px; border-radius: 22px; font-size: 14px; margin-left: 6px;
}
nav ul li.lang a:hover { background: var(--primary); color: #fff; }

/* ---------- Hero ---------- */
.hero {
  position: relative; color: #fff;
  background:
    linear-gradient(115deg, rgba(8,43,102,.92) 0%, rgba(11,61,145,.82) 55%, rgba(30,111,217,.55) 100%),
    url("https://images.unsplash.com/photo-1581092160562-40aa08e78837?auto=format&fit=crop&w=1600&q=70") center/cover no-repeat;
  padding: 130px 0 150px;
  text-align: left;
}
.hero h1 { font-size: clamp(34px, 5vw, 56px); font-weight: 800; line-height: 1.15; max-width: 760px; }
.hero h1 em { color: var(--accent); font-style: normal; }
.hero p { margin: 22px 0 36px; font-size: 19px; max-width: 620px; color: #dbe6f5; }
.btn {
  display: inline-block; padding: 14px 34px; border-radius: 50px;
  font-weight: 700; font-size: 15px; transition: all .25s; cursor: pointer;
}
.btn-accent { background: var(--accent); color: #1a1a1a; }
.btn-accent:hover { transform: translateY(-2px); box-shadow: 0 10px 24px rgba(245,166,35,.4); }
.btn-ghost { border: 2px solid rgba(255,255,255,.7); color: #fff; margin-left: 14px; }
.btn-ghost:hover { background: rgba(255,255,255,.12); }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); }

/* hero stats */
.stats { background: var(--primary-dark); color: #fff; padding: 34px 0; }
.stats .container { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; text-align: center; }
.stats b { font-size: 34px; color: var(--accent); display: block; }
.stats span { font-size: 14px; color: #b9c7dc; letter-spacing: .5px; }

/* ---------- Sections ---------- */
section { padding: 84px 0; }
.section-tag {
  display: inline-block; color: var(--accent); font-weight: 800;
  text-transform: uppercase; letter-spacing: 3px; font-size: 13px; margin-bottom: 10px;
}
.section-title { font-size: clamp(26px, 3.4vw, 38px); color: var(--dark); margin-bottom: 16px; }
.section-sub { color: var(--gray); max-width: 720px; margin-bottom: 48px; font-size: 16px; }
.center { text-align: center; }
.center .section-sub { margin-left: auto; margin-right: auto; }
.bg-light { background: var(--light); }

/* ---------- Feature cards ---------- */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.card {
  background: #fff; border-radius: var(--radius); padding: 34px 28px;
  box-shadow: var(--shadow); transition: transform .25s, box-shadow .25s;
  border-top: 4px solid transparent;
}
.card:hover { transform: translateY(-6px); border-top-color: var(--accent); }
.card .icon {
  width: 56px; height: 56px; border-radius: 12px; margin-bottom: 20px;
  background: linear-gradient(135deg, #e8f0fc, #d3e3fa);
  display: flex; align-items: center; justify-content: center; font-size: 26px;
}
.card h3 { font-size: 19px; margin-bottom: 10px; color: var(--primary-dark); }
.card p { color: var(--gray); font-size: 14.5px; }

/* ---------- About split ---------- */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.split .visual {
  border-radius: var(--radius); min-height: 380px;
  background: linear-gradient(135deg, #0b3d91 0%, #1e6fd9 100%);
  display: flex; align-items: center; justify-content: center;
  color: rgba(255,255,255,.9); font-size: 60px; box-shadow: var(--shadow);
}
.split ul.checklist { margin-top: 24px; }
.split ul.checklist li {
  padding: 8px 0 8px 34px; position: relative; color: #26303a; font-weight: 500;
}
.split ul.checklist li::before {
  content: "✔"; position: absolute; left: 0; top: 8px;
  color: var(--accent); font-weight: 800;
}

/* ---------- Product cards ---------- */
.product-card {
  background: #fff; border-radius: var(--radius); overflow: hidden;
  box-shadow: var(--shadow); transition: transform .25s;
  display: flex; flex-direction: column;
}
.product-card:hover { transform: translateY(-6px); }
.product-thumb {
  height: 150px; display: flex; align-items: center; justify-content: center;
  font-size: 46px; color: #fff;
  background: linear-gradient(135deg, var(--primary), #1e6fd9);
}
.product-card:nth-child(even) .product-thumb { background: linear-gradient(135deg, #082b66, #0b3d91); }
.product-body { padding: 22px 22px 26px; flex: 1; display: flex; flex-direction: column; }
.product-body h3 { font-size: 17px; color: var(--primary-dark); margin-bottom: 8px; }
.product-body p { color: var(--gray); font-size: 13.5px; flex: 1; }
.product-body .more { margin-top: 14px; color: var(--accent); font-weight: 700; font-size: 13px; letter-spacing: .5px; }

/* cert strip */
.cert-strip {
  background: var(--primary-dark); padding: 40px 0; text-align: center; color: #fff;
}
.cert-strip .badges { display: flex; flex-wrap: wrap; justify-content: center; gap: 14px; margin-top: 20px; }
.cert-strip .badge {
  border: 1px solid rgba(255,255,255,.35); border-radius: 50px;
  padding: 8px 24px; font-weight: 700; letter-spacing: 1px; font-size: 14px; color: #e8eef8;
}

/* ---------- CTA ---------- */
.cta {
  background: linear-gradient(115deg, var(--primary) 0%, #1e6fd9 100%);
  color: #fff; text-align: center; padding: 70px 0;
}
.cta h2 { font-size: clamp(24px, 3vw, 34px); margin-bottom: 14px; }
.cta p { color: #d6e3f7; margin-bottom: 30px; }

/* ---------- Page banner ---------- */
.page-banner {
  background: linear-gradient(115deg, rgba(8,43,102,.95), rgba(30,111,217,.85)),
    url("https://images.unsplash.com/photo-1581092918056-0c4c3acd3789?auto=format&fit=crop&w=1600&q=70") center/cover no-repeat;
  color: #fff; padding: 80px 0; text-align: center;
}
.page-banner h1 { font-size: clamp(30px, 4vw, 44px); }
.page-banner p { color: #cfddf0; margin-top: 10px; }
.breadcrumb { margin-top: 12px; font-size: 14px; color: #aebfd9; }
.breadcrumb a { color: var(--accent); }

/* ---------- Contact ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1.3fr; gap: 50px; }
.info-item { display: flex; gap: 18px; margin-bottom: 28px; }
.info-item .icon {
  flex: 0 0 52px; width: 52px; height: 52px; border-radius: 12px;
  background: #e8f0fc; color: var(--primary); font-size: 22px;
  display: flex; align-items: center; justify-content: center;
}
.info-item h4 { color: var(--primary-dark); font-size: 16px; margin-bottom: 4px; }
.info-item p { color: var(--gray); font-size: 14.5px; }
form .form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
form label { display: block; font-weight: 600; font-size: 14px; margin: 16px 0 6px; color: #26303a; }
form input, form textarea, form select {
  width: 100%; padding: 12px 14px; border: 1px solid #d5dde6; border-radius: 8px;
  font-size: 15px; font-family: inherit; background: #fbfcfe; transition: border .2s;
}
form input:focus, form textarea:focus, form select:focus {
  outline: none; border-color: var(--primary); background: #fff;
}
form button { margin-top: 24px; border: none; }

/* ---------- Footer ---------- */
footer { background: var(--dark); color: #9aa7b5; padding: 60px 0 0; font-size: 14.5px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 40px; padding-bottom: 44px; }
footer h4 { color: #fff; font-size: 16px; margin-bottom: 18px; }
footer ul li { margin-bottom: 10px; }
footer a:hover { color: var(--accent); }
.footer-bottom {
  border-top: 1px solid #232d38; padding: 18px 0; text-align: center; font-size: 13px; color: #6d7a88;
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .split, .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .stats .container { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  nav {
    position: absolute; top: 76px; left: 0; right: 0;
    background: #fff; box-shadow: 0 12px 20px rgba(0,0,0,.1);
    display: none; padding: 12px 0;
  }
  nav.open { display: block; }
  nav ul { flex-direction: column; }
  nav a { display: block; padding: 13px 24px; }
  .nav-toggle { display: block; }
  .grid-3, .grid-4, form .form-row { grid-template-columns: 1fr; }
  .btn-ghost { margin-left: 0; margin-top: 12px; }
  .hero { padding: 90px 0 100px; }
}

/* === product detail === */
.breadcrumb-d { margin-top: 10px; font-size: 14px; color: #c4d2e2; }
.breadcrumb-d a { color: #c4d2e2; }
.breadcrumb-d a:hover { color: #fff; }
.breadcrumb-d span { color: #f5a623; }
.detail-wrap { display: grid; grid-template-columns: 360px 1fr; gap: 40px; align-items: start; }
.gallery-main { border: 1px solid #e3e8ef; border-radius: 12px; overflow: hidden; background: #fff; min-height: 300px; display: flex; align-items: center; justify-content: center; }
.gallery-main img { width: 100%; height: auto; display: block; }
.gallery-main.noimg { color: #9aa7b5; padding: 80px 0; }
.thumbs { display: flex; gap: 10px; margin-top: 12px; flex-wrap: wrap; }
.thumbs .thumb { width: 72px; height: 72px; object-fit: cover; border: 2px solid #e3e8ef; border-radius: 8px; cursor: pointer; background: #fff; }
.thumbs .thumb.active { border-color: #f5a623; }
.pd-info .pd-cat { display: inline-block; font-size: 13px; color: #f5a623; font-weight: 600; letter-spacing: .5px; text-transform: uppercase; margin-bottom: 8px; }
.pd-info h2 { font-size: 28px; color: #14233a; margin-bottom: 16px; }
.pd-desc { margin: 14px 0 22px; }
.pd-desc h3, .spec-block h3 { font-size: 18px; color: #14233a; margin-bottom: 10px; }
.pd-desc p { color: #4a5a6a; line-height: 1.7; }
.spec-block { margin-top: 22px; overflow-x: auto; }
.spec-block table { width: 100%; border-collapse: collapse; font-size: 14px; background: #fff; }
.spec-block td, .spec-block th { border: 1px solid #d7dee8; padding: 8px 12px; color: #2c3a4a; }
.spec-block td[align=middle], .spec-block th[align=middle] { text-align: center; }
.spec-block p { line-height: 1.7; color: #4a5a6a; }
.spec-block img { max-width: 100%; height: auto; display: block; margin: 10px 0; }
.loading { color: #9aa7b5; padding: 40px 0; }
.notfound { text-align: center; padding: 60px 0; }
.notfound a { color: #f5a623; }

@media (max-width: 760px) {
  .detail-wrap { grid-template-columns: 1fr; gap: 24px; }
}

/* === products list === */
.filter-bar { display: flex; flex-wrap: wrap; gap: 10px; padding: 18px 0; position: sticky; top: 0; background: #fff; z-index: 20; border-bottom: 1px solid #eef2f7; }
.filter-btn { border: 1px solid #d7dee8; background: #fff; color: #2c3a4a; padding: 9px 18px; border-radius: 30px; font-size: 14px; font-weight: 600; cursor: pointer; transition: all .2s; }
.filter-btn:hover { border-color: #f5a623; }
.filter-btn.active { background: #14233a; border-color: #14233a; color: #fff; }
.big-section { padding: 10px 0 30px; }
.cat-wrap { margin-top: 6px; }
.cat-block { margin-bottom: 26px; }
.cat-head h3 { font-size: 18px; color: #14233a; margin-bottom: 12px; padding-left: 12px; border-left: 4px solid #f5a623; }
.prod-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 14px; }
.prod-card { background: #fff; border: 1px solid #e3e8ef; border-radius: 10px; overflow: hidden; text-decoration: none; transition: all .2s; display: flex; flex-direction: column; }
.prod-card:hover { border-color: #f5a623; box-shadow: 0 8px 18px rgba(11,61,145,.1); transform: translateY(-3px); }
.pc-thumb { height: 130px; background: #f4f7fb; display: flex; align-items: center; justify-content: center; overflow: hidden; }
.pc-thumb img { width: 100%; height: 100%; object-fit: contain; padding: 8px; }
.pc-thumb.noimg { color: #9aa7b5; font-size: 13px; }
.pc-name { padding: 10px 12px; font-size: 13.5px; font-weight: 600; color: #26303a; text-align: center; border-top: 1px solid #f0f3f7; }

@media (max-width: 640px) {
  .prod-grid { grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); gap: 10px; }
  .pc-thumb { height: 100px; }
}