/* ===== 南昌豪志建筑工程有限公司 · 重构样式 =====
   设计原则：极简、双色（钢蓝 #14375E + 暖金 #C8A24A）、统一字体、响应式、AI 友好 */

:root {
  --blue: #14375e;
  --blue-dark: #0e2a47;
  --gold: #c8a24a;
  --ink: #1f2933;
  --muted: #5b6b7b;
  --line: #e3e8ee;
  --bg: #ffffff;
  --bg-soft: #f6f8fa;
  --maxw: 1120px;
  --radius: 10px;
  --font: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.75;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--blue); text-decoration: none; }
a:hover { color: var(--gold); }

img { max-width: 100%; height: auto; display: block; }

/* 可访问性：跳过导航 */
.skip-link {
  position: absolute; left: -999px; top: 0;
  background: var(--blue); color: #fff; padding: 8px 14px; z-index: 100;
}
.skip-link:focus { left: 12px; top: 12px; }

/* ===== 顶部导航 ===== */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,0.95);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--line);
}
.nav {
  max-width: var(--maxw); margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 20px;
}
.brand { display: flex; align-items: center; gap: 12px; font-weight: 700; color: var(--blue); }
.brand .logo { width: 34px; height: 34px; flex: none; }
.brand .name { font-size: 17px; letter-spacing: .5px; }
.brand .name small { display: block; font-size: 11px; font-weight: 400; color: var(--muted); letter-spacing: 1px; }

.nav-links { display: flex; gap: 26px; list-style: none; margin: 0; padding: 0; }
.nav-links a { color: var(--ink); font-size: 15px; padding: 6px 0; border-bottom: 2px solid transparent; }
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--blue); border-bottom-color: var(--gold); }

.nav-toggle { display: none; background: none; border: 1px solid var(--line); border-radius: 8px; padding: 8px 10px; cursor: pointer; }

/* ===== 区块通用 ===== */
section { padding: 72px 20px; }
.container { max-width: var(--maxw); margin: 0 auto; }
.section-soft { background: var(--bg-soft); }
.section-head { text-align: center; margin-bottom: 44px; }
.eyebrow { color: var(--gold); font-weight: 700; letter-spacing: 3px; font-size: 13px; text-transform: uppercase; }
.section-head h2 { font-size: 30px; margin: 8px 0 6px; color: var(--blue); }
.section-head p { color: var(--muted); margin: 0; }

h1, h2, h3 { line-height: 1.3; }

/* ===== Hero ===== */
.hero {
  position: relative; overflow: hidden;
  color: #fff; text-align: center;
  display: flex; flex-direction: column; justify-content: center; align-items: center;
  height: min(56.25vw, 1080px); /* 1920x1080 设计稿：满宽时恰为 1080px 高 */
  min-height: 520px; padding: 0 20px;
}
.hero-bg {
  position: absolute; inset: 0; z-index: 0;
  background-size: cover; background-position: center;
}
.hero-bg.b1 { background-image: url("../assets/banner-1.jpg"); animation: heroCrossfade 16s infinite; }
.hero-bg.b2 { background-image: url("../assets/banner-2.jpg"); animation: heroCrossfade 16s infinite; animation-delay: -8s; }
.hero-veil {
  position: absolute; inset: 0; z-index: 1;
  background: linear-gradient(180deg, rgba(11,31,54,.62) 0%, rgba(11,31,54,.38) 45%, rgba(11,31,54,.68) 100%);
}
.hero > :not(.hero-bg):not(.hero-veil) { position: relative; z-index: 2; }
@keyframes heroCrossfade {
  0% { opacity: 1; } 42% { opacity: 1; }
  50% { opacity: 0; } 92% { opacity: 0; }
  100% { opacity: 1; }
}
@media (prefers-reduced-motion: reduce) {
  .hero-bg.b1, .hero-bg.b2 { animation: none; }
  .hero-bg.b2 { opacity: 0; }
}
.hero .eyebrow { color: var(--gold); }
.hero h1 { font-size: 44px; margin: 14px 0 18px; font-weight: 800; letter-spacing: 1px; }
.hero p.lead { font-size: 19px; color: #d7e2ee; max-width: 720px; margin: 0 auto 32px; }
.hero .slogan { display: inline-block; border: 1px solid rgba(200,162,74,.6); color: var(--gold); padding: 8px 22px; border-radius: 999px; font-weight: 600; letter-spacing: 2px; }

/* ===== 按钮 ===== */
.btn {
  display: inline-block; background: var(--gold); color: #1c1402;
  padding: 13px 30px; border-radius: 999px; font-weight: 700; letter-spacing: 1px;
  transition: transform .15s ease, box-shadow .15s ease;
}
.btn:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(200,162,74,.35); color: #1c1402; }
.btn-ghost { background: transparent; color: #fff; border: 1px solid rgba(255,255,255,.5); }
.btn-ghost:hover { background: rgba(255,255,255,.1); color: #fff; }

/* ===== 关于（两栏） ===== */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
.split .lead-text { font-size: 17px; color: var(--ink); }
.meta-list { list-style: none; padding: 0; margin: 18px 0 0; }
.meta-list li { padding: 10px 0; border-bottom: 1px dashed var(--line); display: flex; gap: 12px; }
.meta-list li b { color: var(--blue); min-width: 84px; }

/* ===== 卡片网格 ===== */
.grid { display: grid; gap: 24px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: var(--bg); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px; transition: border-color .15s, transform .15s;
}
.card:hover { border-color: var(--gold); transform: translateY(-3px); }
.card h3 { color: var(--blue); margin: 0 0 10px; font-size: 19px; }
.card p { color: var(--muted); margin: 0; font-size: 15px; }

/* 资质标签 */
.tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 8px; }
.tag {
  background: var(--bg-soft); border: 1px solid var(--line); color: var(--blue);
  padding: 7px 14px; border-radius: 999px; font-size: 14px; font-weight: 600;
}

/* 新闻条目 */
.news-item { border-bottom: 1px solid var(--line); padding: 22px 0; }
.news-item:last-child { border-bottom: 0; }
.news-item .date { color: var(--gold); font-weight: 700; font-size: 14px; letter-spacing: 1px; }
.news-item h3 { margin: 6px 0; font-size: 20px; }
.news-item h3 a { color: var(--blue); }
.news-item p { color: var(--muted); margin: 0; }

/* 案例 */
.case-card { border-left: 4px solid var(--gold); overflow: hidden; }
.case-card .cat { color: var(--gold); font-weight: 700; font-size: 13px; letter-spacing: 1px; }
.case-card .case-img { width: calc(100% + 52px); aspect-ratio: 4 / 3; height: auto; object-fit: cover; display: block; margin: -26px -26px 16px; border-radius: var(--radius) var(--radius) 0 0; }

/* 联系 */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.contact-info li { list-style: none; padding: 12px 0; border-bottom: 1px solid var(--line); display: flex; gap: 14px; }
.contact-info .k { color: var(--blue); font-weight: 700; min-width: 72px; }
.placeholder { color: #b06a00; background: #fff7e6; border: 1px dashed #e0a800; padding: 2px 8px; border-radius: 6px; font-size: 14px; }

/* 页脚 */
.site-footer { background: var(--blue-dark); color: #c7d4e2; padding: 48px 20px 28px; }
.site-footer a { color: #c7d4e2; }
.site-footer a:hover { color: var(--gold); }
.footer-grid { max-width: var(--maxw); margin: 0 auto; display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 32px; }
.footer-grid h4 { color: #fff; margin: 0 0 14px; font-size: 16px; }
.footer-grid ul { list-style: none; padding: 0; margin: 0; }
.footer-grid li { padding: 6px 0; font-size: 14px; }
.footer-bottom { max-width: var(--maxw); margin: 28px auto 0; padding-top: 18px; border-top: 1px solid rgba(255,255,255,.12); font-size: 13px; color: #8ea3ba; text-align: center; }

/* 响应式 */
@media (max-width: 860px) {
  .nav-links {
    display: none; position: absolute; top: 100%; left: 0; right: 0;
    flex-direction: column; background: #fff; border-bottom: 1px solid var(--line); padding: 12px 20px; gap: 4px;
  }
  .nav-links.open { display: flex; }
  .nav-toggle { display: block; }
  .split, .grid-2, .grid-3, .grid-4, .contact-grid, .footer-grid { grid-template-columns: 1fr; }
  .hero h1 { font-size: 32px; }
  section { padding: 54px 18px; }
}

/* ===== 内页 Banner ===== */
.page-banner {
  position: relative;
  min-height: 300px;
  display: flex;
  align-items: flex-end;
  color: #fff;
  background-size: cover;
  background-position: center;
  padding-bottom: 42px;
}
.page-banner::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(13,42,74,.45) 0%, rgba(13,42,74,.78) 100%);
}
.page-banner .container { position: relative; z-index: 2; width: 100%; }
.page-banner .eyebrow { color: var(--gold); margin-bottom: 6px; }
.page-banner h1 { font-size: clamp(28px, 4vw, 42px); margin: 0; letter-spacing: 2px; }
.pb-about { background-image: url("../assets/page-banner-about.jpg"); }
.pb-cases { background-image: url("../assets/page-banner-cases.jpg"); }
.pb-news { background-image: url("../assets/page-banner-news.jpg"); }
.pb-contact { background-image: url("../assets/page-banner-contact.jpg"); }
.pb-recruit { background-image: url("../assets/page-banner-about.jpg"); }
@media (max-width: 720px) { .page-banner { min-height: 190px; padding-bottom: 26px; } }