/* ===== 德仪微电子 官网样式 ===== */
:root {
  --navy: #0d1b3e;
  --navy-2: #16295c;
  --blue: #1a56db;
  --blue-light: #e8f0fe;
  --text: #22272e;
  --text-2: #5b6470;
  --line: #e5e8ee;
  --bg-gray: #f6f7fa;
  --white: #ffffff;
}

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

html { scroll-behavior: smooth; }

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

a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }

.container { max-width: 1120px; margin: 0 auto; padding: 0 24px; }

/* ===== 顶部导航 ===== */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,.96);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 72px;
}
.logo { display: flex; flex-direction: column; line-height: 1.2; }
.logo-mark { font-size: 22px; font-weight: 700; color: var(--navy); letter-spacing: 1px; }
.logo-sub { font-size: 10px; color: var(--text-2); letter-spacing: 2px; margin-top: 2px; }
.main-nav { display: flex; gap: 36px; }
.main-nav a {
  font-size: 15px; color: var(--text-2); padding: 6px 0;
  border-bottom: 2px solid transparent; transition: all .2s;
}
.main-nav a:hover { color: var(--navy); }
.main-nav a.active { color: var(--navy); font-weight: 600; border-bottom-color: var(--blue); }

/* ===== 首页 Hero ===== */
.hero {
  background:
    radial-gradient(1200px 500px at 80% -10%, rgba(26,86,219,.18), transparent),
    linear-gradient(160deg, var(--navy) 0%, var(--navy-2) 60%, #1b3a8a 100%);
  color: #fff; padding: 110px 0 96px;
}
.hero h1 { font-size: 46px; font-weight: 700; letter-spacing: 2px; margin-bottom: 22px; }
.hero p { font-size: 17px; color: rgba(255,255,255,.82); margin-bottom: 36px; }
.hero-actions { display: flex; gap: 16px; margin-bottom: 64px; }

.btn {
  display: inline-block; padding: 13px 34px; border-radius: 4px;
  font-size: 15px; letter-spacing: 1px; transition: all .2s;
  border: 1px solid transparent; cursor: pointer;
}
.btn-primary { background: var(--blue); color: #fff; }
.btn-primary:hover { background: #1548b8; }
.btn-ghost { border-color: rgba(255,255,255,.45); color: #fff; }
.btn-ghost:hover { border-color: #fff; background: rgba(255,255,255,.08); }
.btn-light { background: #fff; color: var(--navy); }
.btn-light:hover { background: #e8edf7; }

.hero-stats { display: flex; gap: 56px; list-style: none; flex-wrap: wrap; }
.hero-stats li { display: flex; flex-direction: column; }
.hero-stats strong { font-size: 18px; font-weight: 600; }
.hero-stats span { font-size: 13px; color: rgba(255,255,255,.6); margin-top: 4px; }

/* ===== 内页横幅 ===== */
.page-banner {
  background: linear-gradient(150deg, var(--navy) 0%, #1b3a8a 100%);
  color: #fff; padding: 72px 0;
}
.page-banner h1 { font-size: 34px; letter-spacing: 2px; margin-bottom: 10px; }
.page-banner p { color: rgba(255,255,255,.7); font-size: 15px; }

/* ===== 通用区块 ===== */
.section { padding: 88px 0; }
.section-gray { background: var(--bg-gray); }
.section-head { text-align: center; margin-bottom: 56px; }
.section-head h2 { font-size: 30px; color: var(--navy); letter-spacing: 1px; }
.section-head p { color: var(--text-2); margin-top: 10px; font-size: 15px; }

.grid { display: grid; gap: 28px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: #fff; border: 1px solid var(--line); border-radius: 8px;
  padding: 36px 28px; transition: all .25s;
}
.card:hover { border-color: rgba(26,86,219,.4); box-shadow: 0 12px 32px rgba(13,27,62,.08); transform: translateY(-3px); }
.card-icon {
  width: 46px; height: 46px; border-radius: 8px; background: var(--blue-light);
  color: var(--blue); font-size: 20px; display: flex; align-items: center; justify-content: center;
  margin-bottom: 18px;
}
.card h3 { font-size: 19px; color: var(--navy); margin-bottom: 12px; }
.card p { font-size: 14.5px; color: var(--text-2); }

.feature { background: #fff; border: 1px solid var(--line); border-radius: 8px; padding: 26px 22px; }
.feature h4 { font-size: 16px; color: var(--navy); margin-bottom: 8px; }
.feature h4::before {
  content: ""; display: block; width: 26px; height: 3px;
  background: var(--blue); margin-bottom: 12px; border-radius: 2px;
}
.feature p { font-size: 13.5px; color: var(--text-2); }

/* ===== CTA 横带 ===== */
.cta-band {
  background: linear-gradient(120deg, var(--navy), #1b3a8a);
  color: #fff; text-align: center; padding: 72px 0;
}
.cta-band h2 { font-size: 28px; letter-spacing: 1px; margin-bottom: 12px; }
.cta-band p { color: rgba(255,255,255,.75); margin-bottom: 30px; }

/* ===== 关于页 ===== */
.about-layout { display: grid; grid-template-columns: 1.6fr 1fr; gap: 64px; align-items: start; }
.about-text h2 { font-size: 22px; color: var(--navy); margin: 34px 0 14px; }
.about-text h2:first-child { margin-top: 0; }
.about-text p { font-size: 15px; color: var(--text-2); margin-bottom: 14px; }
.about-aside { display: flex; flex-direction: column; gap: 20px; }
.value-item {
  background: var(--bg-gray); border-left: 3px solid var(--blue);
  border-radius: 0 8px 8px 0; padding: 22px 24px;
}
.value-item h4 { font-size: 17px; color: var(--navy); margin-bottom: 6px; }
.value-item p { font-size: 13.5px; color: var(--text-2); }

/* ===== 产品页 ===== */
.product-list { display: flex; flex-direction: column; gap: 24px; }
.product-item {
  display: flex; gap: 28px; background: #fff; border: 1px solid var(--line);
  border-radius: 8px; padding: 34px 32px; transition: all .25s;
}
.product-item:hover { border-color: rgba(26,86,219,.4); box-shadow: 0 12px 32px rgba(13,27,62,.08); }
.product-no {
  font-size: 34px; font-weight: 700; color: rgba(26,86,219,.22);
  font-family: Georgia, serif; line-height: 1; min-width: 56px;
}
.product-body h3 { font-size: 20px; color: var(--navy); margin-bottom: 10px; }
.product-tags { margin-bottom: 12px; }
.product-tags span {
  display: inline-block; font-size: 12px; color: var(--blue);
  background: var(--blue-light); border-radius: 3px; padding: 3px 10px; margin-right: 8px;
}
.product-body > p { font-size: 14.5px; color: var(--text-2); }

.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 28px; }
.step { background: #fff; border: 1px solid var(--line); border-radius: 8px; padding: 28px 24px; text-align: center; }
.step-no {
  display: inline-flex; width: 40px; height: 40px; border-radius: 50%;
  background: var(--navy); color: #fff; align-items: center; justify-content: center;
  font-size: 16px; font-weight: 600; margin-bottom: 14px;
}
.step h4 { font-size: 16px; color: var(--navy); margin-bottom: 6px; }
.step p { font-size: 13px; color: var(--text-2); }

/* ===== 联系页 ===== */
.contact-layout { display: grid; grid-template-columns: 1fr 1.2fr; gap: 64px; align-items: start; }
.contact-layout h2 { font-size: 22px; color: var(--navy); margin-bottom: 24px; }
.contact-list dt {
  font-size: 13px; color: var(--text-2); margin-top: 18px;
}
.contact-list dt:first-child { margin-top: 0; }
.contact-list dd { font-size: 16px; color: var(--text); font-weight: 500; margin-top: 4px; }
.contact-list dd.placeholder { color: #9aa3ad; font-weight: 400; font-size: 14px; }
.contact-note { margin-top: 26px; font-size: 14px; color: var(--text-2); background: var(--bg-gray); border-radius: 8px; padding: 18px 20px; }

.contact-form {
  background: #fff; border: 1px solid var(--line); border-radius: 8px; padding: 36px 32px;
}
.contact-form label { display: block; font-size: 13.5px; color: var(--text-2); margin-bottom: 18px; }
.contact-form input, .contact-form textarea {
  display: block; width: 100%; margin-top: 8px;
  border: 1px solid var(--line); border-radius: 5px; padding: 11px 14px;
  font-size: 14px; font-family: inherit; color: var(--text); outline: none; transition: border .2s;
}
.contact-form input:focus, .contact-form textarea:focus { border-color: var(--blue); }
.form-tip { margin-top: 16px; font-size: 12.5px; color: #9aa3ad; }
.form-result { margin-top: 14px; font-size: 13.5px; min-height: 20px; }
.form-result.ok { color: #1a7f37; }
.form-result.err { color: #c0392b; }
.contact-list dd a { color: var(--text); }
.contact-list dd a:hover { color: var(--blue); }

/* ===== 页脚 ===== */
.site-footer { background: var(--navy); color: rgba(255,255,255,.72); margin-top: auto; }
.footer-inner {
  display: flex; justify-content: space-between; align-items: center;
  padding-top: 44px; padding-bottom: 28px; flex-wrap: wrap; gap: 20px;
}
.footer-logo { font-size: 20px; font-weight: 700; color: #fff; letter-spacing: 1px; }
.footer-desc { font-size: 13px; margin-top: 6px; }
.footer-links { display: flex; gap: 28px; }
.footer-links a { font-size: 13.5px; color: rgba(255,255,255,.65); transition: color .2s; }
.footer-links a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.12); padding-top: 18px; padding-bottom: 24px; }
.footer-bottom p { font-size: 12.5px; color: rgba(255,255,255,.45); }
.footer-bottom a { color: rgba(255,255,255,.55); }
.footer-bottom a:hover { color: #fff; }

/* ===== 响应式 ===== */
@media (max-width: 900px) {
  .grid-3, .grid-4, .steps { grid-template-columns: repeat(2, 1fr); }
  .about-layout, .contact-layout { grid-template-columns: 1fr; gap: 40px; }
  .hero h1 { font-size: 34px; }
  .header-inner { height: 64px; }
  .logo-sub { display: none; }
  .main-nav { gap: 20px; }
  .main-nav a { font-size: 14px; }
  .product-item { flex-direction: column; gap: 10px; }
}
@media (max-width: 600px) {
  .grid-3, .grid-4, .steps { grid-template-columns: 1fr; }
  .hero { padding: 72px 0 64px; }
  .hero h1 { font-size: 28px; }
  .hero-stats { gap: 28px; }
  .br-desktop { display: none; }
  .main-nav { gap: 14px; }
  .section { padding: 60px 0; }
}