/* ============================================================
   Guangyuanpu Electronics Co., Limited
   Professional Blue & White B2B Theme
   ============================================================ */

:root {
  --navy: #0a2f5c;
  --navy-deep: #06203f;
  --blue: #1565c0;
  --blue-hover: #0d47a1;
  --blue-light: #e8f1fb;
  --blue-pale: #f4f8fd;
  --cta: #f26522;
  --cta-hover: #d9531a;
  --text: #1f2933;
  --text-mid: #4a5563;
  --text-light: #7b8794;
  --border: #dde3ea;
  --bg-gray: #f5f7fa;
  --white: #ffffff;
  --success: #1e8e5a;
  --radius: 8px;
  --shadow: 0 2px 12px rgba(10, 47, 92, 0.08);
  --shadow-lg: 0 8px 28px rgba(10, 47, 92, 0.14);
  --max: 1200px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: "Segoe UI", "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--white);
  line-height: 1.7;
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--blue); text-decoration: none; transition: color .2s; }
a:hover { color: var(--blue-hover); }
img { max-width: 100%; display: block; }
ul { list-style: none; }

.container { max-width: var(--max); margin: 0 auto; padding: 0 24px; }
.mono { font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace; }

/* ---------- Top bar ---------- */
.topbar {
  background: var(--navy-deep);
  color: #b9c6d8;
  font-size: 12.5px;
  padding: 7px 0;
}
.topbar .container { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 10px; }
.topbar a { color: #cfdcec; }
.topbar a:hover { color: #fff; }
.topbar .sep { opacity: .4; margin: 0 8px; }

/* ---------- Navbar ---------- */
.navbar {
  background: var(--white);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 100;
  box-shadow: 0 1px 6px rgba(10,47,92,.05);
}
.navbar .container { display: flex; align-items: center; justify-content: space-between; height: 72px; gap: 20px; }

.logo { display: flex; align-items: center; gap: 11px; flex-shrink: 0; }
.logo-mark {
  width: 42px; height: 42px; border-radius: 7px;
  background: linear-gradient(135deg, var(--navy), var(--blue));
  color: #fff; display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 17px; letter-spacing: .5px;
  flex-shrink: 0;
}
.logo-txt strong { display: block; color: var(--navy); font-size: 16px; line-height: 1.25; letter-spacing: -.2px; }
.logo-txt span { display: block; color: var(--text-light); font-size: 11px; letter-spacing: .6px; text-transform: uppercase; }

.nav-menu { display: flex; align-items: center; gap: 4px; }
.nav-menu > li { position: relative; }
.nav-menu > li > a {
  display: block; padding: 10px 13px; color: var(--text);
  font-size: 14.5px; font-weight: 500; border-radius: 5px;
}
.nav-menu > li > a:hover, .nav-menu > li > a.active { color: var(--blue); background: var(--blue-pale); }

.dropdown {
  position: absolute; top: 100%; left: 0; background: var(--white);
  min-width: 240px; border: 1px solid var(--border); border-radius: 0 0 var(--radius) var(--radius);
  box-shadow: var(--shadow-lg); opacity: 0; visibility: hidden;
  transform: translateY(-6px); transition: all .2s;
}
.nav-menu > li:hover .dropdown { opacity: 1; visibility: visible; transform: translateY(0); }
.dropdown a { display: block; padding: 11px 16px; font-size: 14px; border-bottom: 1px solid #f0f3f7; color: var(--text-mid); }
.dropdown a:last-child { border-bottom: none; }
.dropdown a:hover { background: var(--blue-pale); color: var(--blue); }
.dropdown a small { display: block; color: var(--text-light); font-size: 11.5px; }

.btn {
  display: inline-block; padding: 11px 24px; border-radius: var(--radius);
  font-size: 14.5px; font-weight: 600; text-align: center; cursor: pointer;
  border: 2px solid transparent; transition: all .2s;
}
.btn-cta { background: var(--cta); color: #fff; border-color: var(--cta); }
.btn-cta:hover { background: var(--cta-hover); border-color: var(--cta-hover); color: #fff; }
.btn-primary { background: var(--blue); color: #fff; border-color: var(--blue); }
.btn-primary:hover { background: var(--blue-hover); border-color: var(--blue-hover); color: #fff; }
.btn-outline { background: transparent; color: var(--navy); border-color: #c3cddb; }
.btn-outline:hover { background: var(--navy); color: #fff; border-color: var(--navy); }
.btn-lg { padding: 14px 34px; font-size: 16px; }

.burger { display: none; background: none; border: none; font-size: 24px; color: var(--navy); cursor: pointer; }

/* ---------- Hero ---------- */
.hero {
  background: linear-gradient(135deg, var(--navy-deep) 0%, var(--navy) 45%, var(--blue) 100%);
  color: #fff; padding: 76px 0 84px; position: relative; overflow: hidden;
}
.hero::after {
  content: ""; position: absolute; right: -120px; top: -80px;
  width: 520px; height: 520px; border-radius: 50%;
  background: rgba(255,255,255,.045);
}
.hero-inner { position: relative; z-index: 2; max-width: 780px; }
.hero .eyebrow {
  display: inline-block; background: rgba(255,255,255,.14); border: 1px solid rgba(255,255,255,.28);
  padding: 5px 14px; border-radius: 20px; font-size: 12.5px; letter-spacing: .8px;
  text-transform: uppercase; margin-bottom: 22px;
}
.hero h1 { font-size: 44px; line-height: 1.18; font-weight: 700; margin-bottom: 18px; letter-spacing: -.5px; }
.hero h1 em { font-style: normal; color: #7fb3f0; }
.hero p.lead { font-size: 17.5px; color: #d3e2f5; margin-bottom: 32px; line-height: 1.75; }
.hero-btns { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 38px; }
.hero-stats { display: flex; gap: 44px; flex-wrap: wrap; border-top: 1px solid rgba(255,255,255,.18); padding-top: 26px; }
.hero-stats div strong { display: block; font-size: 27px; font-weight: 700; color: #fff; }
.hero-stats div span { font-size: 12.5px; color: #a9c4e4; letter-spacing: .3px; }

/* ---------- Section ---------- */
.section { padding: 72px 0; }
.section-gray { background: var(--bg-gray); }
.section-navy { background: var(--navy); color: #fff; }
.section-navy h2, .section-navy h3 { color: #fff; }
.section-navy p { color: #c5d7ec; }

.sec-head { text-align: center; max-width: 720px; margin: 0 auto 46px; }
.sec-head .kicker {
  color: var(--blue); font-size: 12.5px; font-weight: 700; letter-spacing: 1.4px;
  text-transform: uppercase; margin-bottom: 10px;
}
.section-navy .sec-head .kicker { color: #7fb3f0; }
.sec-head h2 { font-size: 32px; color: var(--navy); margin-bottom: 14px; line-height: 1.3; }
.sec-head p { color: var(--text-mid); font-size: 16px; }

/* ---------- Category cards ---------- */
.cat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(255px, 1fr)); gap: 22px; }
.cat-card {
  background: var(--white); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 30px 26px; transition: all .25s; position: relative; overflow: hidden;
}
.cat-card::before {
  content: ""; position: absolute; top: 0; left: 0; width: 100%; height: 3px;
  background: var(--blue); transform: scaleX(0); transform-origin: left; transition: transform .3s;
}
.cat-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: #c5d8ef; }
.cat-card:hover::before { transform: scaleX(1); }
.cat-icon {
  width: 50px; height: 50px; border-radius: 10px; background: var(--blue-light);
  display: flex; align-items: center; justify-content: center; margin-bottom: 18px;
  font-size: 23px;
}
.cat-card h3 { font-size: 19px; color: var(--navy); margin-bottom: 8px; }
.cat-card h3 a { color: inherit; }
.cat-card p { color: var(--text-mid); font-size: 14px; margin-bottom: 16px; }
.cat-card ul { margin-bottom: 18px; }
.cat-card ul li {
  font-size: 13.5px; color: var(--text-mid); padding-left: 16px;
  position: relative; margin-bottom: 5px;
}
.cat-card ul li::before { content: "▸"; position: absolute; left: 0; color: var(--blue); }
.cat-card .more { font-size: 14px; font-weight: 600; color: var(--blue); }
.cat-card .more::after { content: " →"; }

/* ---------- Feature / advantage ---------- */
.feat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 26px; }
.feat { text-align: center; }
.feat-num {
  width: 46px; height: 46px; margin: 0 auto 14px; border-radius: 50%;
  background: var(--navy); color: #fff; display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 17px;
}
.feat h4 { font-size: 16.5px; color: var(--navy); margin-bottom: 7px; }
.feat p { font-size: 14px; color: var(--text-mid); }

.adv-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 24px; }
.adv {
  background: var(--white); border-left: 4px solid var(--blue);
  padding: 22px 24px; border-radius: 0 var(--radius) var(--radius) 0;
  box-shadow: var(--shadow);
}
.adv h4 { font-size: 16.5px; color: var(--navy); margin-bottom: 8px; display: flex; align-items: center; gap: 9px; }
.adv p { font-size: 14px; color: var(--text-mid); }

/* ---------- Spec table ---------- */
.table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius); }
table.spec { width: 100%; border-collapse: collapse; font-size: 14px; background: #fff; }
table.spec th {
  background: var(--navy); color: #fff; text-align: left;
  padding: 13px 16px; font-weight: 600; font-size: 13.5px; white-space: nowrap;
}
table.spec td { padding: 12px 16px; border-bottom: 1px solid #eef1f5; color: var(--text-mid); vertical-align: top; }
table.spec tbody tr:nth-child(even) { background: #fafcfe; }
table.spec tbody tr:hover { background: var(--blue-pale); }
table.spec td:first-child { font-weight: 600; color: var(--navy); white-space: nowrap; }

/* ---------- Content blocks ---------- */
.prose { max-width: 860px; }
.prose h2 { font-size: 28px; color: var(--navy); margin: 40px 0 16px; }
.prose h3 { font-size: 20px; color: var(--navy); margin: 28px 0 12px; }
.prose h4 { font-size: 16.5px; color: var(--navy); margin: 22px 0 9px; }
.prose p { margin-bottom: 14px; color: var(--text-mid); }
.prose ul { list-style: none; margin: 0 0 18px; }
.prose ul li { padding-left: 22px; position: relative; margin-bottom: 8px; color: var(--text-mid); }
.prose ul li::before { content: "✓"; position: absolute; left: 0; color: var(--success); font-weight: 700; }

.info-box {
  background: var(--blue-pale); border-left: 4px solid var(--blue);
  padding: 18px 22px; border-radius: 0 var(--radius) var(--radius) 0; margin: 22px 0;
}
.info-box p:last-child { margin-bottom: 0; }
.info-box strong { color: var(--navy); }
.warn-box { background: #fff8ed; border-left-color: var(--cta); }

.note {
  background: #fffbe9; border: 1px solid #f0e2b0; border-radius: var(--radius);
  padding: 14px 18px; font-size: 13.5px; color: #7a6220; margin: 20px 0;
}

/* ---------- Page header ---------- */
.page-head {
  background: linear-gradient(120deg, var(--navy-deep), var(--blue));
  color: #fff; padding: 52px 0 48px;
}
.page-head h1 { font-size: 36px; margin-bottom: 10px; }
.page-head p { color: #c9dcf2; font-size: 16px; max-width: 700px; }
.breadcrumb { font-size: 13px; color: #9dbde0; margin-bottom: 14px; }
.breadcrumb a { color: #bfd6f0; }
.breadcrumb span { opacity: .6; margin: 0 7px; }

/* ---------- CTA band ---------- */
.cta-band {
  background: linear-gradient(120deg, var(--navy) 0%, var(--blue) 100%);
  color: #fff; padding: 56px 0; text-align: center;
}
.cta-band h2 { font-size: 30px; margin-bottom: 12px; }
.cta-band p { color: #c9dcf2; font-size: 16.5px; margin-bottom: 28px; }
.cta-band .btn-outline { color: #fff; border-color: rgba(255,255,255,.55); }
.cta-band .btn-outline:hover { background: #fff; color: var(--navy); border-color: #fff; }
.cta-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* ---------- Contact / RFQ ---------- */
.contact-grid { display: grid; grid-template-columns: 1.15fr 1fr; gap: 42px; align-items: start; }
.form-card {
  background: var(--white); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 32px; box-shadow: var(--shadow);
}
.form-card h3 { font-size: 21px; color: var(--navy); margin-bottom: 6px; }
.form-card > p { font-size: 14px; color: var(--text-light); margin-bottom: 22px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.field { margin-bottom: 17px; }
.field label { display: block; font-size: 13.5px; font-weight: 600; color: var(--navy); margin-bottom: 6px; }
.field label .req { color: var(--cta); }
.field input, .field select, .field textarea {
  width: 100%; padding: 11px 13px; border: 1px solid #ccd5e0; border-radius: 6px;
  font-size: 14.5px; font-family: inherit; color: var(--text); background: #fff;
  transition: border-color .2s, box-shadow .2s;
}
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none; border-color: var(--blue); box-shadow: 0 0 0 3px rgba(21,101,192,.12);
}
.field textarea { min-height: 116px; resize: vertical; }
.field .hint { font-size: 12px; color: var(--text-light); margin-top: 5px; }
.form-note { font-size: 12.5px; color: var(--text-light); margin-top: 14px; line-height: 1.6; }

.contact-card {
  background: var(--navy); color: #fff; border-radius: var(--radius); padding: 32px;
}
.contact-card h3 { color: #fff; font-size: 20px; margin-bottom: 20px; }
.contact-item { margin-bottom: 22px; padding-bottom: 20px; border-bottom: 1px solid rgba(255,255,255,.14); }
.contact-item:last-child { border-bottom: none; margin-bottom: 0; padding-bottom: 0; }
.contact-item .lbl {
  font-size: 11.5px; text-transform: uppercase; letter-spacing: 1px;
  color: #8fb3dd; margin-bottom: 5px;
}
.contact-item .val { font-size: 15px; color: #fff; line-height: 1.6; }
.contact-item .val a { color: #7fb3f0; }
.contact-item .val a:hover { color: #fff; }
.contact-item.small .val { font-size: 13.5px; color: #c5d7ec; }

/* ---------- FAQ ---------- */
.faq-item { border: 1px solid var(--border); border-radius: var(--radius); margin-bottom: 14px; background: #fff; overflow: hidden; }
.faq-q {
  padding: 18px 22px; font-size: 16px; font-weight: 600; color: var(--navy);
  cursor: pointer; display: flex; justify-content: space-between; align-items: center; gap: 14px;
}
.faq-q:hover { background: var(--blue-pale); }
.faq-q::after { content: "+"; font-size: 22px; color: var(--blue); font-weight: 400; flex-shrink: 0; }
.faq-item.open .faq-q::after { content: "−"; }
.faq-a { padding: 0 22px; max-height: 0; overflow: hidden; transition: max-height .3s ease, padding .3s ease; }
.faq-item.open .faq-a { padding: 0 22px 20px; max-height: 700px; }
.faq-a p { color: var(--text-mid); font-size: 14.5px; margin-bottom: 10px; }
.faq-a p:last-child { margin-bottom: 0; }

/* ---------- Trust badges ---------- */
.badges { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; }
.badge {
  background: rgba(255,255,255,.1); border: 1px solid rgba(255,255,255,.24);
  border-radius: 22px; padding: 7px 18px; font-size: 13px; color: #e4eefa;
}

/* ---------- Footer ---------- */
.footer { background: var(--navy-deep); color: #9fb4cd; padding: 56px 0 0; font-size: 14px; }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1.3fr; gap: 40px; padding-bottom: 40px; }
.footer h5 { color: #fff; font-size: 14.5px; margin-bottom: 16px; letter-spacing: .3px; }
.footer p { margin-bottom: 12px; line-height: 1.75; }
.footer ul li { margin-bottom: 9px; }
.footer ul li a { color: #9fb4cd; }
.footer ul li a:hover { color: #fff; }
.footer .f-brand { display: flex; align-items: center; gap: 11px; margin-bottom: 16px; }
.footer .f-brand .logo-mark { background: linear-gradient(135deg, #2a5f9e, #4d8fd6); }
.footer .f-brand strong { color: #fff; font-size: 15.5px; display: block; }
.footer .f-brand span { font-size: 11.5px; color: #7d95b3; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.1); padding: 20px 0;
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px;
  font-size: 12.5px; color: #7d95b3;
}

/* ---------- Responsive ---------- */
@media (max-width: 980px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
}
@media (max-width: 860px) {
  .nav-menu {
    display: none; position: absolute; top: 72px; left: 0; right: 0;
    background: #fff; flex-direction: column; align-items: stretch;
    border-bottom: 1px solid var(--border); box-shadow: var(--shadow-lg);
    padding: 10px; gap: 0;
  }
  .nav-menu.show { display: flex; }
  .nav-menu > li > a { padding: 13px 14px; border-radius: 5px; }
  .dropdown {
    position: static; opacity: 1; visibility: visible; transform: none;
    box-shadow: none; border: none; border-left: 2px solid var(--blue-light);
    margin-left: 14px; min-width: 0; display: none;
  }
  .nav-menu > li:hover .dropdown { display: block; }
  .burger { display: block; }
  .navbar .container { height: 64px; }
  .hero h1 { font-size: 31px; }
  .hero { padding: 54px 0 60px; }
  .hero-stats { gap: 26px; }
  .hero-stats div strong { font-size: 22px; }
  .sec-head h2 { font-size: 25px; }
  .page-head h1 { font-size: 27px; }
  .section { padding: 50px 0; }
  .form-row { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 30px; }
  .topbar { font-size: 11.5px; }
}