/* 平台宣传官网 (装企数字化管理系统 SaaS) */
:root {
  --primary: #2f6bff;
  --primary-dark: #1e54d8;
  --dark: #0b1220;
  --dark2: #101a2e;
  --text: #2b3445;
  --muted: #67748e;
  --gray: #f4f7fc;
  --radius: 12px;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: "PingFang SC", "Microsoft YaHei", sans-serif; color: var(--text); background: #fff; -webkit-font-smoothing: antialiased; }
a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
html { scroll-behavior: smooth; }
section[id] { scroll-margin-top: 72px; }

/* ===== header ===== */
.site-header { position: fixed; top: 0; left: 0; right: 0; z-index: 100; background: rgba(11, 18, 32, 0.86); backdrop-filter: blur(12px); }
.header-inner { max-width: 1200px; margin: 0 auto; padding: 0 20px; display: flex; align-items: center; gap: 26px; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; color: #fff; font-size: 17px; font-weight: 700; }
.brand-mark { width: 32px; height: 32px; border-radius: 8px; background: linear-gradient(135deg, #2f6bff, #19c2fb); display: flex; align-items: center; justify-content: center; font-size: 16px; }
.main-nav { flex: 1; display: flex; gap: 4px; }
.main-nav a { color: rgba(255,255,255,.82); padding: 8px 14px; border-radius: 6px; font-size: 15px; }
.main-nav a:hover { background: rgba(255,255,255,.1); color: #fff; }
.header-cta { display: flex; align-items: center; gap: 14px; }
.header-phone { color: #9fc2ff; font-weight: 700; }
.btn { display: inline-block; border: none; cursor: pointer; font-size: 15px; padding: 9px 22px; border-radius: 8px; transition: all .2s; }
.btn-outline { border: 1px solid rgba(255,255,255,.45); color: #fff; background: transparent; }
.btn-outline:hover { background: rgba(255,255,255,.14); }
.btn-primary { background: var(--primary); color: #fff; box-shadow: 0 6px 18px rgba(47,107,255,.35); }
.btn-primary:hover { background: var(--primary-dark); }
.btn-ghost { border: 1px solid rgba(255,255,255,.35); color: #fff; background: transparent; }
.btn-ghost:hover { background: rgba(255,255,255,.1); }
.btn-lg { padding: 13px 34px; font-size: 16px; border-radius: 10px; }
.btn-block { width: 100%; padding: 13px; font-size: 16px; }

/* ===== hero ===== */
.hero { padding: 130px 20px 90px; background: radial-gradient(1000px 500px at 78% -10%, #1c2b4d 0%, var(--dark) 62%); color: #fff; text-align: center; }
.hero-tag { display: inline-block; padding: 6px 16px; border-radius: 20px; border: 1px solid rgba(159,194,255,.5); color: #9fc2ff; font-size: 13px; letter-spacing: 1px; }
.hero h1 { font-size: 44px; line-height: 1.3; margin: 20px 0 14px; }
.hero h1 em { font-style: normal; color: #6ea3ff; }
.hero-sub { font-size: 16.5px; color: rgba(255,255,255,.72); letter-spacing: .4px; }
.hero-cta { display: flex; gap: 16px; justify-content: center; margin-top: 30px; }
.hero-points { display: flex; gap: 18px; justify-content: center; flex-wrap: wrap; margin-top: 26px; }
.hero-points span { font-size: 13.5px; color: rgba(255,255,255,.75); background: rgba(255,255,255,.07); padding: 6px 14px; border-radius: 6px; }

/* ===== 轮播图 ===== */
.banner-wrap { max-width: 1200px; margin: 26px auto 0; padding: 0 20px; }
.banner-box { position: relative; height: 320px; border-radius: var(--radius); overflow: hidden; box-shadow: 0 10px 30px rgba(11,18,32,.12); background: var(--dark2); }
.banner-slide { position: absolute; inset: 0; opacity: 0; transition: opacity .6s; }
.banner-slide.on { opacity: 1; }
.banner-slide img { width: 100%; height: 100%; object-fit: cover; }
.banner-title { position: absolute; left: 0; right: 0; bottom: 0; padding: 14px 22px; color: #fff; font-size: 17px; font-weight: 600; background: linear-gradient(transparent, rgba(11,18,32,.75)); }
.banner-dots { display: flex; justify-content: center; gap: 8px; margin-top: 12px; }
.banner-dots i { width: 8px; height: 8px; border-radius: 50%; background: #c9d4e6; cursor: pointer; transition: all .2s; }
.banner-dots i.on { background: var(--primary); width: 22px; border-radius: 4px; }

/* ===== 通用 section ===== */
.section { padding: 74px 0; }
.section-gray { background: var(--gray); }
.section-dark { background: var(--dark); color: #fff; }
.section-dark .section-head p { color: rgba(255,255,255,.6); }
.section-head { text-align: center; margin-bottom: 42px; }
.section-head h2 { font-size: 32px; color: var(--dark); letter-spacing: 1px; }
.section-dark .section-head h2 { color: #fff; }
.section-head p { color: var(--muted); margin-top: 10px; font-size: 15px; }

/* ===== 产品功能 ===== */
.feature-grid { max-width: 1200px; margin: 0 auto; padding: 0 20px; display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.feature-card { background: #fff; border: 1px solid #eaeef5; border-radius: var(--radius); padding: 26px 22px; transition: transform .25s, box-shadow .25s; }
.feature-card:hover { transform: translateY(-4px); box-shadow: 0 12px 28px rgba(11,18,32,.1); }
.f-ico { font-size: 34px; margin-bottom: 12px; }
.feature-card h3 { font-size: 16.5px; color: var(--dark); margin-bottom: 10px; }
.feature-card p { font-size: 13.5px; color: var(--muted); line-height: 1.85; }

/* ===== 平台优势 ===== */
.adv-grid { max-width: 1100px; margin: 0 auto; padding: 0 20px; display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.adv-card { background: rgba(255,255,255,.05); border: 1px solid rgba(255,255,255,.1); border-radius: var(--radius); padding: 26px 22px; }
.adv-card b { display: block; font-size: 16.5px; color: #fff; margin-bottom: 12px; }
.adv-card p { font-size: 13.5px; color: rgba(255,255,255,.6); line-height: 1.85; }

/* ===== 使用流程 ===== */
.process-steps { max-width: 1000px; margin: 0 auto; padding: 0 20px; display: flex; align-items: center; justify-content: center; gap: 14px; }
.step { background: #fff; border: 1px solid #e8edf4; border-radius: var(--radius); padding: 26px 24px; text-align: center; flex: 1; }
.step b { display: inline-block; width: 38px; height: 38px; border-radius: 50%; background: var(--primary); color: #fff; line-height: 38px; font-size: 17px; margin-bottom: 12px; }
.step h3 { font-size: 16.5px; color: var(--dark); margin-bottom: 8px; }
.step p { font-size: 13px; color: var(--muted); line-height: 1.8; }
.step-arrow { color: #b9c6da; font-size: 22px; }

/* ===== FAQ ===== */
.faq-list { max-width: 860px; margin: 0 auto; padding: 0 20px; }
.faq-list details { background: #fff; border: 1px solid #e5eaf3; border-radius: 10px; margin-bottom: 12px; padding: 16px 20px; }
.faq-list details[open] { border-color: #bcd0f7; }
.faq-list summary { cursor: pointer; font-weight: 600; color: var(--dark); font-size: 15.5px; }
.faq-list details p { margin-top: 10px; color: var(--muted); line-height: 1.9; font-size: 14px; }

/* ===== 申请试用 ===== */
.contact-wrap { max-width: 1020px; margin: 0 auto; padding: 0 20px; display: flex; gap: 44px; align-items: flex-start; }
.contact-info { flex: 1; }
.contact-info h2 { font-size: 29px; color: var(--dark); margin-bottom: 12px; }
.contact-info > p { color: var(--muted); margin-bottom: 22px; }
.contact-list { list-style: none; }
.contact-list li { display: flex; align-items: center; gap: 12px; margin-bottom: 18px; font-size: 15.5px; }
.contact-list .ico { width: 42px; height: 42px; border-radius: 10px; background: var(--gray); display: flex; align-items: center; justify-content: center; }
.apply-benefits { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 8px; }
.apply-benefits span { font-size: 13px; color: var(--primary); background: #eef3ff; padding: 5px 13px; border-radius: 6px; }
.contact-form { width: 420px; flex-shrink: 0; background: #fff; border: 1px solid #e5eaf3; border-radius: 14px; padding: 28px; box-shadow: 0 14px 40px rgba(11,18,32,.08); }
.contact-form h3 { font-size: 19px; color: var(--dark); margin-bottom: 18px; }
.contact-form input, .contact-form textarea { width: 100%; border: 1px solid #dde4ee; border-radius: 8px; padding: 12px 14px; font-size: 14px; margin-bottom: 12px; outline: none; resize: vertical; font-family: inherit; color: var(--text); }
.contact-form input:focus, .contact-form textarea:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(47,107,255,.12); }
.form-tip { font-size: 12px; color: #9aa7ba; margin-top: 8px; text-align: center; }

/* ===== 友情链接 ===== */
.friend-links { max-width: 1200px; margin: 0 auto; padding: 14px 20px; border-top: 1px solid rgba(255,255,255,.08); display: flex; flex-wrap: wrap; align-items: center; gap: 10px 18px; color: rgba(255,255,255,.45); font-size: 13px; }
.friend-links a { color: rgba(255,255,255,.62); }
.friend-links a:hover { color: #fff; }

/* ===== 页脚 ===== */
.site-footer { background: var(--dark); color: rgba(255,255,255,.62); padding: 44px 0 0; font-size: 14px; }
.footer-inner { max-width: 1200px; margin: 0 auto; padding: 0 20px 30px; display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 26px; }
.footer-col b { display: block; color: #fff; font-size: 15px; margin-bottom: 14px; }
.footer-col a, .footer-col p { display: block; color: rgba(255,255,255,.55); margin-bottom: 9px; font-size: 13.5px; }
.footer-col a:hover { color: #fff; }
.footer-icp { border-top: 1px solid rgba(255,255,255,.06); padding: 16px 20px; text-align: center; font-size: 12.5px; color: rgba(255,255,255,.35); }
.footer-icp a { color: rgba(255,255,255,.35); }
.footer-icp a:hover { color: #fff; }

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .adv-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-wrap { flex-direction: column; }
  .contact-form { width: 100%; }
}
@media (max-width: 720px) {
  .main-nav { display: none; }
  .hero h1 { font-size: 30px; }
  .feature-grid { grid-template-columns: 1fr 1fr; }
  .adv-grid { grid-template-columns: 1fr; }
  .process-steps { flex-direction: column; }
  .step-arrow { transform: rotate(90deg); }
  .footer-inner { grid-template-columns: 1fr 1fr; }
}