/* ========================================
   GyroNavi - Xi'an GyroNavi Technology Co., Ltd.
   Main Stylesheet
   ======================================== */

/* --- CSS Variables --- */
:root {
  --color-primary: #0a5c8a;
  --color-primary-dark: #074268;
  --color-primary-light: #e8f4fd;
  --color-accent: #e8751a;
  --color-accent-hover: #c9600f;
  --color-bg: #ffffff;
  --color-bg-gray: #f5f7fa;
  --color-bg-dark: #1a2b3c;
  --color-text: #2c3e50;
  --color-text-light: #5a6c7d;
  --color-text-white: #ffffff;
  --color-border: #dde4ed;
  --color-success: #27ae60;
  --color-error: #e74c3c;
  --font-sans: 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'Consolas', 'Monaco', monospace;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.12);
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --max-width: 1260px;
  --header-height: 72px;
}

/* --- Reset & Base --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--color-primary); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--color-accent); }
ul { list-style: none; }
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }

/* --- Typography --- */
h1, h2, h3, h4 { line-height: 1.3; font-weight: 700; color: var(--color-text); }
h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.4rem; }
h4 { font-size: 1.15rem; }
p { margin-bottom: 1rem; color: var(--color-text-light); }

/* --- Buttons --- */
.btn {
  display: inline-block; padding: 12px 28px; border-radius: var(--radius-md);
  font-size: 0.95rem; font-weight: 600; cursor: pointer; border: 2px solid transparent;
  transition: all 0.25s; text-align: center; line-height: 1.4;
}
.btn-primary {
  background: var(--color-accent); color: #fff; border-color: var(--color-accent);
}
.btn-primary:hover { background: var(--color-accent-hover); border-color: var(--color-accent-hover); color: #fff; }
.btn-outline {
  background: transparent; color: var(--color-primary); border-color: var(--color-primary);
}
.btn-outline:hover { background: var(--color-primary); color: #fff; }
.btn-white {
  background: #fff; color: var(--color-primary); border-color: #fff;
}
.btn-white:hover { background: var(--color-primary-light); color: var(--color-primary); }
.btn-sm { padding: 8px 18px; font-size: 0.85rem; }

/* --- Header --- */
.site-header {
  position: sticky; top: 0; z-index: 1000;
  background: var(--color-bg-dark); height: var(--header-height);
  box-shadow: var(--shadow-sm);
}
.site-header .container {
  display: flex; align-items: center; justify-content: space-between; height: 100%;
}
.logo {
  font-size: 1.5rem; font-weight: 800; color: var(--color-text-white);
  display: flex; align-items: center; gap: 8px;
}
.logo span { color: var(--color-accent); }
.logo-img { height: 40px; width: auto; }

.nav-links { display: flex; gap: 6px; align-items: center; }
.nav-links a {
  color: #ccd6e0; padding: 8px 16px; border-radius: var(--radius-sm);
  font-size: 0.92rem; font-weight: 500; transition: all 0.2s;
}
.nav-links a:hover, .nav-links a.active {
  color: #fff; background: rgba(255,255,255,0.1);
}
.nav-links a.btn { padding: 8px 18px; font-size: 0.88rem; }
.nav-links a.btn-primary:hover { background: var(--color-accent-hover); }

.hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; background: none; border: none; padding: 4px; }
.hamburger span { display: block; width: 26px; height: 2.5px; background: #fff; border-radius: 2px; transition: all 0.3s; }

/* --- Hero --- */
.hero {
  background: linear-gradient(135deg, #0a2a44 0%, #0a5c8a 50%, #0d3b5e 100%);
  color: #fff; padding: 100px 0 80px; position: relative; overflow: hidden;
}
.hero::before {
  content: ''; position: absolute; top: -50%; right: -20%;
  width: 600px; height: 600px; border-radius: 50%;
  background: radial-gradient(circle, rgba(232,117,26,0.15) 0%, transparent 70%);
}
.hero-content { position: relative; z-index: 1; max-width: 680px; }
.hero h1 { font-size: 2.8rem; color: #fff; margin-bottom: 16px; }
.hero h1 span { color: var(--color-accent); }
.hero p { font-size: 1.15rem; color: #c0d4e8; margin-bottom: 32px; }
.hero-btns { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-stats { display: flex; gap: 40px; margin-top: 50px; }
.hero-stat { text-align: center; }
.hero-stat .num { font-size: 2rem; font-weight: 800; color: var(--color-accent); }
.hero-stat .label { font-size: 0.85rem; color: #8aadcc; }

/* --- Sections --- */
.section { padding: 80px 0; }
.section-gray { background: var(--color-bg-gray); }
.section-header { text-align: center; margin-bottom: 50px; }
.section-header h2 { margin-bottom: 10px; }
.section-header p { font-size: 1.05rem; max-width: 600px; margin: 0 auto; }

/* --- Product Category Cards --- */
.categories-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.cat-card {
  background: #fff; border-radius: var(--radius-lg); overflow: hidden;
  box-shadow: var(--shadow-sm); transition: all 0.3s; border: 1px solid var(--color-border);
}
.cat-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-4px); }
.cat-card-img { height: 200px; background: var(--color-bg-gray); display: flex; align-items: center; justify-content: center; overflow: hidden; }
.cat-card-img img { width: 100%; height: 100%; object-fit: cover; }
.cat-card-body { padding: 20px; }
.cat-card-body h3 { font-size: 1.1rem; margin-bottom: 8px; }
.cat-card-body p { font-size: 0.9rem; margin-bottom: 14px; }
.cat-card-body .btn { width: 100%; }

/* --- Application Grid --- */
.app-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.app-card {
  background: #fff; border-radius: var(--radius-md); padding: 28px 24px;
  border: 1px solid var(--color-border); transition: all 0.3s; display: flex; gap: 16px; align-items: flex-start;
}
.app-card:hover { box-shadow: var(--shadow-md); border-color: var(--color-primary); }
.app-icon { font-size: 2rem; flex-shrink: 0; width: 52px; height: 52px; display: flex; align-items: center; justify-content: center; border-radius: var(--radius-md); background: var(--color-primary-light); }
.app-card h3 { font-size: 1.05rem; margin-bottom: 6px; }
.app-card p { font-size: 0.88rem; margin-bottom: 0; }

/* --- Advantages --- */
.advantages-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.adv-card { text-align: center; padding: 30px 20px; }
.adv-icon { font-size: 2.5rem; margin-bottom: 14px; }
.adv-card h3 { font-size: 1.05rem; margin-bottom: 8px; }
.adv-card p { font-size: 0.88rem; }

/* --- Blog Cards --- */
.blog-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.blog-card {
  background: #fff; border-radius: var(--radius-lg); overflow: hidden;
  box-shadow: var(--shadow-sm); border: 1px solid var(--color-border); transition: all 0.3s;
}
.blog-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-3px); }
.blog-card-img { height: 180px; background: var(--color-bg-gray); overflow: hidden; }
.blog-card-img img { width: 100%; height: 100%; object-fit: cover; }
.blog-card-body { padding: 20px; }
.blog-card-body .date { font-size: 0.8rem; color: var(--color-text-light); margin-bottom: 8px; }
.blog-card-body h3 { font-size: 1.05rem; margin-bottom: 10px; }
.blog-card-body p { font-size: 0.88rem; }

/* --- Footer --- */
.site-footer { background: var(--color-bg-dark); color: #8899aa; padding: 60px 0 30px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; }
.footer-col h3 { color: #fff; font-size: 1rem; margin-bottom: 18px; text-transform: uppercase; letter-spacing: 1px; }
.footer-col p { color: #8899aa; font-size: 0.9rem; }
.footer-col a { color: #8899aa; font-size: 0.9rem; display: block; margin-bottom: 8px; }
.footer-col a:hover { color: var(--color-accent); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.08); margin-top: 40px; padding-top: 24px; text-align: center; font-size: 0.85rem; }

/* --- Breadcrumb --- */
.breadcrumb { padding: 16px 0; font-size: 0.88rem; color: var(--color-text-light); }
.breadcrumb a { color: var(--color-text-light); }
.breadcrumb a:hover { color: var(--color-primary); }
.breadcrumb span { color: var(--color-text); }

/* --- Page Header --- */
.page-header { background: var(--color-bg-dark); color: #fff; padding: 50px 0; text-align: center; }
.page-header h1 { color: #fff; margin-bottom: 10px; }
.page-header p { color: #a0b8d0; font-size: 1.05rem; }

/* --- Product Filter Layout --- */
.products-layout { display: grid; grid-template-columns: 260px 1fr; gap: 32px; margin-top: 30px; }

/* --- Product Cards Grid --- */
.products-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.product-card {
  background: #fff; border-radius: var(--radius-lg); overflow: hidden;
  border: 1px solid var(--color-border); transition: all 0.3s;
}
.product-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.product-card-img { height: 200px; background: var(--color-bg-gray); display: flex; align-items: center; justify-content: center; padding: 20px; }
.product-card-img img { max-height: 100%; object-fit: contain; }
.product-card-body { padding: 18px; }
.product-card-body h3 { font-size: 1rem; margin-bottom: 6px; }
.product-card-body h3 a { color: var(--color-text); }
.product-card-body h3 a:hover { color: var(--color-primary); }
.product-card-specs { font-size: 0.82rem; color: var(--color-text-light); margin-bottom: 12px; }
.product-card-specs span { display: inline-block; background: var(--color-primary-light); color: var(--color-primary); padding: 3px 10px; border-radius: 20px; margin: 2px 4px 2px 0; }
.product-card-actions { display: flex; gap: 8px; }
.product-card-actions .btn { flex: 1; padding: 8px 12px; font-size: 0.82rem; }

/* --- Product Detail --- */
.product-detail { padding: 50px 0; }
.product-detail-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; align-items: start; }
.product-gallery { position: sticky; top: calc(var(--header-height) + 20px); }
.product-gallery img { width: 100%; border-radius: var(--radius-lg); border: 1px solid var(--color-border); }
.product-info h1 { margin-bottom: 12px; }
.product-info .tagline { color: var(--color-primary); font-weight: 600; font-size: 1.05rem; margin-bottom: 16px; }
.product-info .desc { margin-bottom: 24px; }

.specs-table { width: 100%; border-collapse: collapse; margin: 24px 0; }
.specs-table th, .specs-table td { padding: 12px 16px; text-align: left; border-bottom: 1px solid var(--color-border); }
.specs-table th { background: var(--color-bg-gray); font-size: 0.88rem; width: 35%; color: var(--color-text); }
.specs-table td { font-size: 0.9rem; }

.related-products { margin-top: 60px; padding-top: 40px; border-top: 1px solid var(--color-border); }

/* --- Application Detail --- */
.app-detail-layout { display: grid; grid-template-columns: 1fr 360px; gap: 40px; margin-top: 30px; }
.app-detail-content h2 { margin-top: 32px; margin-bottom: 14px; }
.app-detail-content ul { margin-bottom: 20px; }
.app-detail-content li { padding: 6px 0 6px 20px; position: relative; color: var(--color-text-light); }
.app-detail-content li::before { content: ''; position: absolute; left: 0; top: 13px; width: 8px; height: 8px; border-radius: 50%; background: var(--color-primary); }
.app-sidebar { position: sticky; top: calc(var(--header-height) + 20px); }
.app-sidebar .side-card { background: var(--color-bg-gray); border-radius: var(--radius-lg); padding: 24px; margin-bottom: 20px; }
.app-sidebar .side-card h3 { margin-bottom: 14px; font-size: 1rem; }
.app-sidebar .product-link { display: block; padding: 8px 0; border-bottom: 1px solid var(--color-border); font-size: 0.9rem; }

/* --- Blog Layout --- */
.blog-layout { display: grid; grid-template-columns: 1fr 320px; gap: 40px; margin-top: 30px; }
.blog-post-card {
  display: flex; gap: 20px; padding: 24px 0; border-bottom: 1px solid var(--color-border);
}
.blog-post-card-img { width: 200px; height: 140px; flex-shrink: 0; border-radius: var(--radius-md); overflow: hidden; background: var(--color-bg-gray); }
.blog-post-card-body h3 { font-size: 1.15rem; margin-bottom: 8px; }
.blog-post-card-body .meta { font-size: 0.82rem; color: var(--color-text-light); margin-bottom: 10px; }

.blog-sidebar { position: sticky; top: calc(var(--header-height) + 20px); }
.blog-sidebar .side-card { background: var(--color-bg-gray); border-radius: var(--radius-lg); padding: 24px; margin-bottom: 20px; }
.blog-sidebar .side-card h3 { font-size: 1rem; margin-bottom: 14px; }
.tags { display: flex; flex-wrap: wrap; gap: 6px; }
.tag { background: var(--color-primary-light); color: var(--color-primary); padding: 4px 12px; border-radius: 20px; font-size: 0.78rem; }

.blog-article { max-width: 780px; margin: 0 auto; padding: 40px 0; }
.blog-article h1 { font-size: 2.2rem; margin-bottom: 16px; }
.blog-article .article-meta { color: var(--color-text-light); font-size: 0.9rem; margin-bottom: 30px; padding-bottom: 20px; border-bottom: 1px solid var(--color-border); }
.blog-article h2 { font-size: 1.5rem; margin-top: 36px; margin-bottom: 16px; }
.blog-article h3 { font-size: 1.2rem; margin-top: 24px; margin-bottom: 12px; }
.blog-article p { line-height: 1.85; }
.blog-article ul, .blog-article ol { margin-bottom: 20px; padding-left: 22px; }
.blog-article li { margin-bottom: 6px; color: var(--color-text-light); }
.blog-article blockquote {
  border-left: 4px solid var(--color-primary); background: var(--color-primary-light);
  padding: 16px 22px; margin: 20px 0; border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

/* --- Company Pages --- */
.profile-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; align-items: center; margin: 40px 0; }
.profile-img { border-radius: var(--radius-lg); overflow: hidden; }
.timeline { position: relative; padding: 20px 0; }
.timeline-item { display: flex; gap: 20px; margin-bottom: 24px; }
.timeline-year {
  font-weight: 800; font-size: 1.1rem; color: var(--color-primary); min-width: 60px; flex-shrink: 0;
}
.cert-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-top: 30px; }
.cert-card { text-align: center; padding: 30px 20px; border: 1px solid var(--color-border); border-radius: var(--radius-lg); }
.cert-icon { font-size: 3rem; margin-bottom: 14px; }

/* --- Factory Tour --- */
.factory-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 30px; }
.factory-img { border-radius: var(--radius-md); overflow: hidden; height: 240px; }
.factory-img img { width: 100%; height: 100%; object-fit: cover; }

/* --- FAQ Accordion --- */
.faq-list { max-width: 800px; margin: 30px auto 0; }
.faq-item { border-bottom: 1px solid var(--color-border); }
.faq-question {
  width: 100%; padding: 20px 0; text-align: left; background: none; border: none;
  font-size: 1.05rem; font-weight: 600; cursor: pointer; display: flex;
  justify-content: space-between; align-items: center; color: var(--color-text);
}
.faq-question::after { content: '+'; font-size: 1.5rem; font-weight: 300; color: var(--color-primary); }
.faq-item.open .faq-question::after { content: '\2212'; }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.35s ease; }
.faq-item.open .faq-answer { max-height: 500px; }
.faq-answer p { padding: 0 0 20px; }

/* --- Case Studies --- */
.case-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; margin-top: 30px; }
.case-card {
  background: #fff; border-radius: var(--radius-lg); overflow: hidden;
  border: 1px solid var(--color-border); transition: all 0.3s;
}
.case-card:hover { box-shadow: var(--shadow-md); }
.case-card-img { height: 220px; background: var(--color-bg-gray); overflow: hidden; }
.case-card-img img { width: 100%; height: 100%; object-fit: cover; }
.case-card-body { padding: 22px; }
.case-card-body .region { display: inline-block; background: var(--color-primary-light); color: var(--color-primary); padding: 3px 12px; border-radius: 20px; font-size: 0.78rem; margin-bottom: 10px; }

.case-detail-layout { max-width: 860px; margin: 30px auto 0; }
.case-meta { display: flex; gap: 24px; margin: 16px 0 30px; flex-wrap: wrap; }
.case-meta-item { background: var(--color-primary-light); padding: 8px 16px; border-radius: 20px; font-size: 0.88rem; color: var(--color-primary); font-weight: 500; }

/* --- Contact Page --- */
.contact-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; margin-top: 30px; }
.contact-info-item { display: flex; gap: 14px; margin-bottom: 24px; }
.contact-info-item .icon { font-size: 1.4rem; }
.contact-info-item h3 { font-size: 1rem; margin-bottom: 4px; }
.contact-info-item p { font-size: 0.9rem; margin-bottom: 0; }

/* --- Form Styles --- */
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-size: 0.88rem; font-weight: 600; margin-bottom: 6px; color: var(--color-text); }
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%; padding: 12px 14px; border: 1px solid var(--color-border);
  border-radius: var(--radius-md); font-size: 0.92rem; font-family: var(--font-sans);
  transition: border-color 0.2s; background: #fff;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none; border-color: var(--color-primary); box-shadow: 0 0 0 3px rgba(10,92,138,0.08);
}
.form-group textarea { resize: vertical; min-height: 120px; }
.form-group .error-msg { font-size: 0.8rem; color: var(--color-error); margin-top: 4px; display: none; }
.form-group.error input,
.form-group.error select,
.form-group.error textarea { border-color: var(--color-error); }
.form-group.error .error-msg { display: block; }
.form-success { display: none; text-align: center; padding: 30px; }
.form-success.show { display: block; }
.form-success .icon { font-size: 3rem; color: var(--color-success); margin-bottom: 14px; }
.hp-field { position: absolute; left: -9999px; opacity: 0; height: 0; overflow: hidden; }

/* --- Popup --- */
.popup-overlay {
  display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.55);
  z-index: 9999; align-items: center; justify-content: center;
}
.popup-overlay.show { display: flex; }
.popup-box {
  background: #fff; border-radius: var(--radius-lg); padding: 36px 32px;
  max-width: 520px; width: 90%; max-height: 90vh; overflow-y: auto; position: relative;
}
.popup-close {
  position: absolute; top: 12px; right: 16px; background: none; border: none;
  font-size: 1.5rem; cursor: pointer; color: var(--color-text-light);
}
.popup-box h2 { font-size: 1.4rem; margin-bottom: 20px; text-align: center; }

/* --- Floating Button --- */
.float-quote-btn {
  position: fixed; bottom: 30px; right: 30px; z-index: 999;
  background: var(--color-accent); color: #fff; border: none;
  padding: 14px 24px; border-radius: 50px; font-size: 0.95rem;
  font-weight: 700; cursor: pointer; box-shadow: 0 4px 20px rgba(232,117,26,0.35);
  transition: all 0.3s; display: flex; align-items: center; gap: 8px;
}
.float-quote-btn:hover { transform: translateY(-2px); box-shadow: 0 6px 28px rgba(232,117,26,0.45); }

/* --- 404 --- */
.error-page { text-align: center; padding: 120px 20px; }
.error-page h1 { font-size: 6rem; color: var(--color-primary); margin-bottom: 0; }
.error-page p { font-size: 1.2rem; margin-bottom: 30px; }

/* --- Empty States --- */
.empty-state { text-align: center; padding: 60px 20px; }
.empty-state p { font-size: 1.05rem; }

/* --- Utility --- */
.text-center { text-align: center; }
.mt-1 { margin-top: 10px; }
.mt-2 { margin-top: 20px; }
.mt-3 { margin-top: 30px; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }