/* ============================================================
   深圳兆芯达科技有限公司 - 企业官网样式
   配色：深蓝 + 金色（取自LOGO）
   ============================================================ */

/* ---------- CSS 变量（改配色只需改这里） ---------- */
:root {
  --primary: #162d50;       /* 深蓝 - 主色 */
  --primary-dark: #0f1f38;  /* 深蓝 - 深色 */
  --primary-light: #2a4a72; /* 深蓝 - 浅色 */
  --accent: #d4942a;        /* 金色 - 点缀色 */
  --accent-light: #e8b04a;  /* 金色 - 浅色 */
  --text: #2c3e50;          /* 正文色 */
  --text-light: #6b7c93;    /* 次要文字 */
  --bg: #ffffff;            /* 背景白 */
  --bg-gray: #f5f7fa;       /* 浅灰背景 */
  --border: #e4e9f0;        /* 边框色 */
  --shadow: 0 4px 20px rgba(22, 45, 80, 0.08);
  --shadow-hover: 0 8px 30px rgba(22, 45, 80, 0.15);
  --radius: 8px;
  --transition: all 0.3s ease;
}

/* ---------- 基础重置 ---------- */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  font-size: 15px;
  overflow-x: hidden;
}
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ---------- 导航栏 ---------- */
.navbar {
  position: fixed; top: 0; left: 0; right: 0;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(10px);
  z-index: 1000;
  transition: var(--transition);
  border-bottom: 1px solid transparent;
}
.navbar.scrolled {
  box-shadow: var(--shadow);
  border-bottom-color: var(--border);
}
.nav-container {
  max-width: 1200px; margin: 0 auto;
  padding: 0 24px;
  display: flex; align-items: center; justify-content: space-between;
  height: 105px;
}
.nav-logo img { height: 64px; width: auto; }
.nav-menu { display: flex; gap: 32px; }
.nav-link {
  font-size: 20px; font-weight: 500;
  color: var(--text);
  position: relative;
  transition: var(--transition);
  padding: 4px 0;
  letter-spacing: 0.5px;
}
.nav-link::after {
  content: ''; position: absolute;
  bottom: 0; left: 0; width: 0; height: 2px;
  background: var(--accent);
  transition: var(--transition);
}
.nav-link:hover { color: var(--primary); }
.nav-link:hover::after { width: 100%; }
.nav-right { display: flex; align-items: center; gap: 16px; }
.lang-switch {
  background: var(--primary);
  color: #fff;
  border: none;
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}
.lang-switch:hover { background: var(--accent); }
.nav-toggle {
  display: none;
  flex-direction: column; gap: 5px;
  background: none; border: none; cursor: pointer;
  padding: 4px;
}
.nav-toggle span {
  width: 24px; height: 2px;
  background: var(--primary);
  transition: var(--transition);
}

/* ---------- Hero 首屏 ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex; align-items: center; justify-content: center;
  text-align: center;
  overflow: hidden;
}
.hero-bg {
  position: absolute; inset: 0;
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 50%, var(--primary-light) 100%);
}
.hero-bg::before {
  content: ''; position: absolute; inset: 0;
  background:
    radial-gradient(circle at 20% 30%, rgba(212,148,42,0.15) 0%, transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(212,148,42,0.1) 0%, transparent 50%);
}
.hero-bg::after {
  content: ''; position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
}
.hero-content {
  position: relative; z-index: 2;
  padding: 0 24px;
  max-width: 900px;
}
.hero-sub {
  color: var(--accent);
  font-size: 14px;
  letter-spacing: 4px;
  font-weight: 600;
  margin-bottom: 20px;
  text-transform: uppercase;
}
.hero-title {
  color: #fff;
  font-size: clamp(28px, 5vw, 52px);
  font-weight: 700;
  margin-bottom: 16px;
  letter-spacing: 2px;
}
.hero-slogan {
  color: rgba(255,255,255,0.8);
  font-size: clamp(16px, 2.5vw, 22px);
  margin-bottom: 40px;
  letter-spacing: 6px;
}
.hero-btns { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.btn {
  display: inline-block;
  padding: 14px 36px;
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border: 2px solid transparent;
}
.btn-primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.btn-primary:hover {
  background: var(--accent-light);
  border-color: var(--accent-light);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(212,148,42,0.4);
}
.btn-outline {
  background: transparent;
  color: #fff;
  border-color: rgba(255,255,255,0.5);
}
.btn-outline:hover {
  border-color: #fff;
  background: rgba(255,255,255,0.1);
}
.btn-block { width: 100%; }
.hero-scroll {
  position: absolute; bottom: 40px; left: 50%;
  transform: translateX(-50%);
  z-index: 2;
}
.hero-scroll span {
  display: block; width: 26px; height: 42px;
  border: 2px solid rgba(255,255,255,0.4);
  border-radius: 13px;
  position: relative;
}
.hero-scroll span::before {
  content: ''; position: absolute;
  top: 8px; left: 50%; transform: translateX(-50%);
  width: 4px; height: 8px;
  background: var(--accent);
  border-radius: 2px;
  animation: scrollDown 1.8s ease-in-out infinite;
}
@keyframes scrollDown {
  0% { opacity: 1; top: 8px; }
  100% { opacity: 0; top: 24px; }
}

/* ---------- 通用 Section ---------- */
.section { padding: 90px 0; }
.section-header { text-align: center; margin-bottom: 60px; }
.section-tag {
  color: var(--accent);
  font-size: 13px;
  letter-spacing: 3px;
  font-weight: 700;
  text-transform: uppercase;
  margin-bottom: 12px;
}
.section-title {
  font-size: clamp(24px, 3.5vw, 36px);
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 16px;
}
.title-line {
  width: 50px; height: 3px;
  background: var(--accent);
  margin: 0 auto;
  border-radius: 2px;
}
.section-desc {
  color: var(--text-light);
  font-size: 16px;
  margin-top: 16px;
  max-width: 600px;
  margin-left: auto; margin-right: auto;
}

/* ---------- 关于我们 ---------- */
.about { background: var(--bg); }
.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 60px;
  align-items: center;
}
.about-text p {
  color: var(--text);
  margin-bottom: 18px;
  font-size: 15px;
  line-height: 1.9;
}
.about-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 36px;
  padding-top: 30px;
  border-top: 1px solid var(--border);
}
.stat-item { text-align: center; }
.stat-num {
  display: block;
  font-size: 28px;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 4px;
}
.stat-label {
  font-size: 13px;
  color: var(--text-light);
}
.about-image { display: flex; justify-content: center; }
.about-img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
  border-radius: var(--radius);
  box-shadow: var(--shadow-hover);
}

/* ---------- 业务范围 ---------- */
.business { background: var(--bg-gray); }
.business-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.biz-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 36px 28px;
  box-shadow: var(--shadow);
  transition: var(--transition);
  border-top: 3px solid transparent;
}
.biz-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
  border-top-color: var(--accent);
}
.biz-icon {
  font-size: 40px;
  margin-bottom: 20px;
  width: 70px; height: 70px;
  background: var(--primary-light);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
}
.biz-title {
  font-size: 19px;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 12px;
}
.biz-desc {
  font-size: 14px;
  color: var(--text-light);
  line-height: 1.8;
}
.biz-card-cta {
  background: var(--primary);
  display: flex; flex-direction: column;
  justify-content: center;
}
.biz-card-cta .biz-title { color: #fff; }
.biz-card-cta .biz-desc { color: rgba(255,255,255,0.7); }
.biz-link {
  display: inline-block;
  margin-top: 16px;
  color: var(--accent);
  font-weight: 600;
  font-size: 15px;
}
.biz-link:hover { color: var(--accent-light); }

/* ---------- 合作伙伴 ---------- */
.partners { background: var(--bg); }
.partners-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  max-width: 1000px;
  margin: 0 auto;
}
.partner-item {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 20px;
  display: flex; align-items: center; justify-content: center;
  min-height: 110px;
  transition: var(--transition);
}
.partner-item img {
  max-height: 55px;
  max-width: 100%;
  object-fit: contain;
  filter: grayscale(100%);
  opacity: 0.75;
  transition: var(--transition);
}
.partner-item:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow);
}
.partner-item:hover img {
  filter: grayscale(0%);
  opacity: 1;
}
.partners-note {
  text-align: center;
  color: var(--text-light);
  font-size: 12px;
  margin-top: 24px;
}

/* ---------- 联系我们 ---------- */
.contact { background: var(--bg-gray); }
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 50px;
}
.contact-item {
  display: flex; gap: 18px;
  margin-bottom: 28px;
  align-items: flex-start;
}
.contact-icon {
  width: 48px; height: 48px;
  background: var(--primary);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
}
.contact-item h4 {
  font-size: 16px;
  color: var(--primary);
  margin-bottom: 4px;
}
.contact-item p {
  color: var(--text-light);
  font-size: 14px;
}
.contact-form-wrap {
  background: #fff;
  padding: 36px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.contact-form h3 {
  font-size: 20px;
  color: var(--primary);
  margin-bottom: 24px;
}
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-bottom: 14px;
}
.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 14px;
  font-family: inherit;
  transition: var(--transition);
  outline: none;
}
.contact-form input:focus,
.contact-form textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(212,148,42,0.1);
}
.contact-form textarea { resize: vertical; margin-bottom: 14px; }
.form-tip {
  text-align: center;
  font-size: 13px;
  color: var(--text-light);
  margin-top: 12px;
}

/* ---------- 页脚 ---------- */
.footer {
  background: var(--primary-dark);
  color: rgba(255,255,255,0.7);
  padding: 50px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1.2fr 0.8fr;
  gap: 40px;
  padding-bottom: 40px;
}
.footer-text-logo {
  display: flex; align-items: center; gap: 12px;
  margin-bottom: 16px;
}
.ftl-en {
  font-size: 24px;
  font-weight: 800;
  color: #fff;
  letter-spacing: 2px;
}
.ftl-line {
  width: 24px; height: 2px;
  background: var(--accent);
  flex-shrink: 0;
}
.ftl-cn {
  font-size: 18px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 4px;
}
.footer-brand p { font-size: 14px; line-height: 1.8; }
.footer-links h4, .footer-contact h4 {
  color: #fff;
  font-size: 16px;
  margin-bottom: 18px;
}
.footer-links a {
  display: block;
  font-size: 14px;
  margin-bottom: 10px;
  transition: var(--transition);
}
.footer-links a:hover { color: var(--accent); }
.footer-contact p { font-size: 14px; margin-bottom: 10px; }
.footer-wechat { text-align: center; }
.footer-wechat h4 { text-align: center; }
.footer-wechat img {
  width: 110px; height: 110px;
  border-radius: 8px;
  background: #fff;
  padding: 6px;
  margin: 0 auto 8px;
}
.footer-wechat p {
  font-size: 13px;
  color: rgba(255,255,255,0.6);
}
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding: 20px 0;
  text-align: center;
  font-size: 13px;
}

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .nav-menu {
    position: fixed;
    top: 105px; left: 0; right: 0;
    background: #fff;
    flex-direction: column;
    padding: 20px 24px;
    gap: 16px;
    box-shadow: var(--shadow);
    transform: translateY(-150%);
    transition: var(--transition);
  }
  .nav-menu.active { transform: translateY(0); }
  .nav-toggle { display: flex; }
  .about-grid { grid-template-columns: 1fr; gap: 40px; }
  .business-grid { grid-template-columns: repeat(2, 1fr); }
  .partners-grid { grid-template-columns: repeat(3, 1fr); }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 30px; }
}
@media (max-width: 600px) {
  .section { padding: 60px 0; }
  .business-grid { grid-template-columns: 1fr; }
  .partners-grid { grid-template-columns: repeat(2, 1fr); }
  .about-stats { grid-template-columns: repeat(2, 1fr); }
  .form-row { grid-template-columns: 1fr; }
  .hero-btns { flex-direction: column; align-items: center; }
  .btn { width: 100%; max-width: 280px; text-align: center; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-wechat h4 { text-align: center; }
}