/* 森之汇企业官网 — 简约大气 */
:root {
  --blue: #2E6DA8;
  --blue-deep: #1F4E79;
  --blue-light: #EAF2FA;
  --red: #D3232A;
  --ink: #2B2F36;
  --gray: #6B7280;
  --line: #E5E9EF;
  --bg: #FFFFFF;
  --radius: 10px;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  color: var(--ink); background: var(--bg); line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
.container { max-width: 1160px; 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; }
.brand { display: flex; align-items: center; gap: 12px; }
.brand img { height: 44px; width: auto; }
.main-nav { display: flex; align-items: center; gap: 6px; }
.main-nav a {
  padding: 8px 16px; font-size: 15px; color: var(--ink); border-radius: 6px;
  transition: color .2s, background .2s;
}
.main-nav a:hover { color: var(--blue); background: var(--blue-light); }
.main-nav a.active { color: var(--blue); font-weight: 600; }
.nav-cta {
  margin-left: 10px; padding: 8px 20px !important;
  background: var(--blue); color: #fff !important; border-radius: 20px !important;
}
.nav-cta:hover { background: var(--blue-deep) !important; }
.nav-user { display: none; align-items: center; gap: 10px; }
.nav-user .uname { color: var(--blue); font-weight: 600; font-size: 14px; }
.nav-user .logout { font-size: 13px; color: var(--gray); cursor: pointer; background: none; border: none; }
.nav-user .logout:hover { color: var(--red); }
body.logged-in .nav-user { display: flex; }
body.logged-in .nav-login { display: none; }
.menu-btn { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
.menu-btn span { display: block; width: 22px; height: 2px; background: var(--ink); margin: 5px 0; transition: .2s; }

/* ---------- Hero ---------- */
.hero {
  position: relative; min-height: 560px; display: flex; align-items: center;
  background: linear-gradient(115deg, rgba(20,40,70,.88) 0%, rgba(31,78,121,.72) 55%, rgba(31,78,121,.35) 100%), url("../img/factory.jpg") center/cover no-repeat;
}
.hero-content { color: #fff; max-width: 720px; padding: 90px 0; }
.hero-tag {
  display: inline-block; padding: 4px 14px; font-size: 13px; letter-spacing: 4px;
  border: 1px solid rgba(255,255,255,.5); border-radius: 20px; margin-bottom: 24px;
}
.hero h1 { font-size: 44px; line-height: 1.25; font-weight: 700; letter-spacing: 2px; }
.hero h1 em { font-style: normal; color: #FFD37A; }
.hero p { margin-top: 20px; font-size: 17px; color: rgba(255,255,255,.88); max-width: 560px; }
.hero-actions { margin-top: 36px; display: flex; gap: 16px; flex-wrap: wrap; }
.btn {
  display: inline-block; padding: 12px 32px; border-radius: 24px; font-size: 15px;
  transition: .2s; border: none; cursor: pointer; text-align: center;
}
.btn-primary { background: var(--red); color: #fff; }
.btn-primary:hover { background: #b41d23; }
.btn-ghost { border: 1px solid rgba(255,255,255,.7); color: #fff; }
.btn-ghost:hover { background: rgba(255,255,255,.15); }
.btn-blue { background: var(--blue); color: #fff; }
.btn-blue:hover { background: var(--blue-deep); }

/* ---------- 页头横幅（内页） ---------- */
.page-banner {
  background: linear-gradient(115deg, var(--blue-deep), var(--blue));
  color: #fff; padding: 72px 0 60px;
}
.page-banner .crumb { font-size: 13px; opacity: .8; margin-bottom: 10px; letter-spacing: 2px; }
.page-banner h1 { font-size: 34px; letter-spacing: 3px; }
.page-banner p { margin-top: 10px; opacity: .85; font-size: 15px; }

/* ---------- 通用 Section ---------- */
.section { padding: 84px 0; }
.section.alt { background: #F7F9FC; }
.section-head { text-align: center; margin-bottom: 52px; }
.section-head .sub { color: var(--red); font-size: 13px; letter-spacing: 6px; text-transform: uppercase; }
.section-head h2 { font-size: 30px; margin-top: 8px; letter-spacing: 2px; }
.section-head .bar { width: 48px; height: 3px; background: var(--blue); margin: 18px auto 0; }
.section-head p.desc { color: var(--gray); margin-top: 16px; max-width: 640px; margin-left: auto; margin-right: auto; }

/* ---------- 数字亮点 ---------- */
.stats { background: var(--blue-deep); color: #fff; padding: 56px 0; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; text-align: center; }
.stat .num { font-size: 40px; font-weight: 700; font-family: Georgia, serif; }
.stat .num span { font-size: 18px; margin-left: 2px; }
.stat .label { margin-top: 6px; font-size: 14px; opacity: .8; letter-spacing: 2px; }

/* ---------- 卡片网格 ---------- */
.grid { display: grid; gap: 26px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; transition: transform .25s, box-shadow .25s;
}
.card:hover { transform: translateY(-6px); box-shadow: 0 16px 36px rgba(31,78,121,.12); }
.card .thumb { height: 220px; overflow: hidden; background: #f2f4f7; }
.card .thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s; }
.card:hover .thumb img { transform: scale(1.05); }
.card .body { padding: 22px; }
.card h3 { font-size: 18px; color: var(--blue-deep); }
.card p { margin-top: 8px; font-size: 14px; color: var(--gray); }
.card .link { display: inline-block; margin-top: 14px; color: var(--blue); font-size: 14px; }

/* 图库（证书/环境/设备） */
.gallery { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.gallery .shot { border-radius: var(--radius); overflow: hidden; box-shadow: 0 4px 14px rgba(0,0,0,.06); background: #fff; }
.gallery .shot img { width: 100%; height: 190px; object-fit: cover; }
.gallery .shot figcaption { padding: 10px 12px; font-size: 13px; color: var(--gray); text-align: center; }

/* ---------- 特色优势 ---------- */
.feature { text-align: center; padding: 34px 22px; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); transition: .25s; }
.feature:hover { border-color: var(--blue); box-shadow: 0 12px 30px rgba(31,78,121,.1); }
.feature .icon {
  width: 62px; height: 62px; margin: 0 auto 18px; border-radius: 50%;
  background: var(--blue-light); color: var(--blue); font-size: 26px;
  display: flex; align-items: center; justify-content: center;
}
.feature h3 { font-size: 17px; }
.feature p { margin-top: 8px; font-size: 13.5px; color: var(--gray); }

/* ---------- 关于我们 ---------- */
.about-split { display: grid; grid-template-columns: 1.05fr 1fr; gap: 48px; align-items: center; }
.about-split .pic { border-radius: var(--radius); overflow: hidden; box-shadow: 0 20px 44px rgba(31,78,121,.16); }
.about-split h2 { font-size: 28px; color: var(--blue-deep); margin-bottom: 18px; }
.about-split p { color: var(--gray); margin-bottom: 14px; font-size: 15px; text-align: justify; }
.keyline { border-left: 3px solid var(--red); padding-left: 14px; color: var(--ink) !important; }

/* 文化 */
.culture-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.culture-item { background: #fff; border-top: 3px solid var(--blue); padding: 26px 20px; border-radius: 0 0 var(--radius) var(--radius); box-shadow: 0 6px 18px rgba(31,78,121,.07); }
.culture-item:nth-child(2) { border-top-color: var(--red); }
.culture-item:nth-child(3) { border-top-color: #4C8FD1; }
.culture-item:nth-child(4) { border-top-color: var(--blue-deep); }
.culture-item h3 { font-size: 16px; color: var(--blue-deep); }
.culture-item p { margin-top: 10px; font-size: 14px; color: var(--gray); }

/* 时间轴 */
.timeline { position: relative; max-width: 820px; margin: 0 auto; padding-left: 0; }
.timeline::before { content: ""; position: absolute; left: 50%; top: 0; bottom: 0; width: 2px; background: var(--line); }
.tl-item { position: relative; width: 50%; padding: 0 40px 44px 0; }
.tl-item:nth-child(even) { left: 50%; padding: 0 0 44px 40px; }
.tl-item .dot {
  position: absolute; top: 4px; right: -9px; width: 18px; height: 18px; border-radius: 50%;
  background: #fff; border: 4px solid var(--blue); z-index: 1;
}
.tl-item:nth-child(even) .dot { right: auto; left: -9px; }
.tl-item .year { font-size: 22px; font-weight: 700; color: var(--blue); font-family: Georgia, serif; }
.tl-item h4 { font-size: 16px; margin-top: 4px; }
.tl-item p { font-size: 14px; color: var(--gray); margin-top: 4px; }

/* ---------- 产品页 ---------- */
.product-block { display: grid; grid-template-columns: 1fr 1fr; gap: 44px; align-items: center; padding: 48px 0; border-bottom: 1px solid var(--line); }
.product-block:last-child { border-bottom: none; }
.product-block.flip .pics { order: 2; }
.product-block .pics { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.product-block .pics img { border-radius: 8px; height: 200px; width: 100%; object-fit: cover; box-shadow: 0 8px 20px rgba(0,0,0,.08); }
.product-block .pics img:first-child { grid-column: 1 / -1; height: 260px; }
.product-block .cat-tag { color: var(--red); font-size: 13px; letter-spacing: 4px; }
.product-block h2 { font-size: 26px; color: var(--blue-deep); margin: 8px 0 14px; }
.product-block p { color: var(--gray); font-size: 15px; text-align: justify; }
.product-block ul { margin-top: 16px; }
.product-block ul li { position: relative; padding-left: 22px; font-size: 14.5px; color: var(--ink); margin-bottom: 8px; }
.product-block ul li::before { content: "◆"; position: absolute; left: 0; color: var(--blue); font-size: 12px; top: 3px; }

/* ---------- 表单 ---------- */
.contact-wrap { display: grid; grid-template-columns: 1fr 1.2fr; gap: 48px; }
.info-item { display: flex; gap: 16px; margin-bottom: 26px; }
.info-item .ico {
  flex: 0 0 46px; width: 46px; height: 46px; border-radius: 50%;
  background: var(--blue-light); color: var(--blue); display: flex; align-items: center; justify-content: center; font-size: 20px;
}
.info-item h4 { font-size: 15px; }
.info-item p { font-size: 14px; color: var(--gray); margin-top: 2px; }
.form-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 32px; box-shadow: 0 12px 32px rgba(31,78,121,.08); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.field { margin-bottom: 16px; }
.field label { display: block; font-size: 14px; margin-bottom: 6px; color: var(--ink); }
.field label i { color: var(--red); font-style: normal; }
.field input, .field select, .field textarea {
  width: 100%; padding: 11px 14px; border: 1px solid var(--line); border-radius: 8px;
  font-size: 14px; font-family: inherit; transition: border .2s; background: #FBFCFE;
}
.field input:focus, .field select:focus, .field textarea:focus { outline: none; border-color: var(--blue); background: #fff; }
.field textarea { min-height: 120px; resize: vertical; }
.form-msg { margin-top: 12px; font-size: 14px; display: none; padding: 10px 14px; border-radius: 8px; }
.form-msg.ok { display: block; background: #EAF7EF; color: #1E7E3E; }
.form-msg.err { display: block; background: #FDEEEE; color: var(--red); }

/* ---------- 登录页 ---------- */
.auth-wrap { max-width: 440px; margin: 0 auto; }
.auth-card { background: #fff; border: 1px solid var(--line); border-radius: 14px; padding: 40px 36px; box-shadow: 0 18px 44px rgba(31,78,121,.1); }
.auth-tabs { display: flex; border-bottom: 2px solid var(--line); margin-bottom: 28px; }
.auth-tabs button { flex: 1; background: none; border: none; font-size: 16px; padding: 12px; cursor: pointer; color: var(--gray); border-bottom: 2px solid transparent; margin-bottom: -2px; font-family: inherit; }
.auth-tabs button.active { color: var(--blue); border-bottom-color: var(--blue); font-weight: 600; }
.auth-note { margin-top: 18px; font-size: 12.5px; color: #A6ADB8; text-align: center; }
.member-panel { display: none; }
.member-panel.show { display: block; }
.member-head { display: flex; align-items: center; gap: 16px; margin-bottom: 24px; }
.avatar { width: 56px; height: 56px; border-radius: 50%; background: var(--blue); color: #fff; font-size: 24px; display: flex; align-items: center; justify-content: center; }
.member-head h3 { font-size: 20px; }
.member-head p { font-size: 13px; color: var(--gray); }
.inquiry-item { border: 1px solid var(--line); border-radius: 10px; padding: 16px 18px; margin-bottom: 14px; background: #FBFCFE; }
.inquiry-item .meta { font-size: 12.5px; color: var(--gray); display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 6px; }
.inquiry-item .meta .tag { background: var(--blue-light); color: var(--blue); padding: 1px 10px; border-radius: 10px; }
.inquiry-item p { font-size: 14px; color: var(--ink); }
.empty-tip { text-align: center; color: var(--gray); font-size: 14px; padding: 30px 0; }

/* ---------- CTA ---------- */
.cta-band { background: linear-gradient(115deg, var(--blue-deep), var(--blue)); color: #fff; text-align: center; padding: 64px 24px; }
.cta-band h2 { font-size: 28px; letter-spacing: 2px; }
.cta-band p { margin: 12px 0 26px; opacity: .85; }

/* ---------- 页脚 ---------- */
.site-footer { background: #1D2733; color: #9AA6B4; padding: 56px 0 0; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 36px; padding-bottom: 40px; }
.footer-grid h4 { color: #fff; font-size: 15px; margin-bottom: 16px; letter-spacing: 1px; }
.footer-grid p, .footer-grid a { font-size: 13.5px; line-height: 2; color: #9AA6B4; }
.footer-grid a:hover { color: #fff; }
.footer-brand img { height: 40px; margin-bottom: 14px; }
.copyright { border-top: 1px solid #2C3947; text-align: center; padding: 18px 0; font-size: 12.5px; color: #67737F; }

/* ---------- 动画 ---------- */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s ease, transform .7s ease; }
.reveal.visible { opacity: 1; transform: none; }

/* ---------- 响应式 ---------- */
@media (max-width: 960px) {
  .grid-3, .grid-4, .culture-grid, .stats-grid, .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .gallery { grid-template-columns: repeat(2, 1fr); }
  .about-split, .contact-wrap, .product-block { grid-template-columns: 1fr; }
  .product-block.flip .pics { order: 0; }
  .hero h1 { font-size: 32px; }
}
@media (max-width: 680px) {
  .menu-btn { display: block; }
  .main-nav {
    display: none; position: absolute; top: 72px; left: 0; right: 0;
    background: #fff; flex-direction: column; align-items: stretch;
    border-bottom: 1px solid var(--line); padding: 12px 20px 18px; gap: 2px;
    box-shadow: 0 18px 30px rgba(0,0,0,.08);
  }
  .main-nav.open { display: flex; }
  .main-nav a { padding: 12px 8px; }
  .grid-3, .grid-4, .grid-2, .culture-grid, .footer-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .gallery { grid-template-columns: 1fr 1fr; }
  .timeline::before { left: 8px; }
  .tl-item, .tl-item:nth-child(even) { width: 100%; left: 0; padding: 0 0 36px 34px; }
  .tl-item .dot, .tl-item:nth-child(even) .dot { left: 0; right: auto; }
  .form-row { grid-template-columns: 1fr; }
  .hero-content { padding: 64px 0; }
}