/* 生意管家 ERP 官网 - 统一样式
   设计风格：白色背景 + 浅色专业版，品牌蓝(#1677ff)点缀
*/
:root {
  --primary: #1677ff;
  --primary-dark: #0958d9;
  --gradient-main: linear-gradient(135deg, #1677ff, #0958d9);
  --gradient-accent: linear-gradient(135deg, #4096ff, #1677ff);
  --text-main: #1f2937;
  --text-sub: #4b5563;
  --text-dim: #9ca3af;
  --bg-page: #f5f7fb;
  --card-bg: #ffffff;
  --border: #e6eaf2;
  --accent: #1677ff;
  --max-width: 1200px;
  --radius: 14px;
  --shadow: 0 8px 24px rgba(31, 45, 80, 0.08);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  color: var(--text-main);
  background: var(--bg-page);
  min-height: 100vh;
  line-height: 1.6;
}

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

.container { max-width: var(--max-width); margin: 0 auto; padding: 0 20px; }

/* ── 顶部导航 ── */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}
.navbar .container { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.nav-brand { display: flex; align-items: center; gap: 10px; font-size: 19px; font-weight: 700; letter-spacing: 0.5px; color: var(--text-main); }
.nav-brand .logo {
  width: 34px; height: 34px; border-radius: 9px;
  display: block; object-fit: cover;
  box-shadow: 0 4px 14px rgba(22, 119, 255, 0.20);
}
.nav-links { display: flex; gap: 6px; }
.nav-links a {
  padding: 8px 16px; border-radius: 8px; font-size: 15px;
  color: var(--text-sub); transition: all 0.2s;
}
.nav-links a:hover { color: var(--primary); background: rgba(22,119,255,0.08); }
.nav-links a.active {
  color: #fff; background: var(--primary);
  box-shadow: 0 4px 12px rgba(22,119,255,0.28);
}
.nav-toggle { display: none; background: none; border: 0; color: var(--text-main); font-size: 24px; cursor: pointer; }

/* ── 页面容器 ── */
.page { padding-top: 64px; min-height: calc(100vh - 64px); }
.section { padding: 64px 0; }
.section-title { text-align: center; font-size: 28px; font-weight: 700; margin-bottom: 10px; color: var(--text-main); }
.section-sub { text-align: center; color: var(--text-dim); margin-bottom: 42px; font-size: 15px; }

/* ── 卡片 ── */
.glass-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.glass-card:hover { transform: translateY(-4px); box-shadow: 0 16px 36px rgba(31,45,80,0.14); }

/* ── 按钮 ── */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 28px; border-radius: 10px;
  font-size: 15px; font-weight: 600; cursor: pointer;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text-main);
  transition: all 0.2s;
}
.btn:hover { background: #f0f4ff; border-color: var(--primary); transform: translateY(-2px); }
.btn-primary {
  background: var(--primary);
  border-color: transparent;
  color: #fff;
  box-shadow: 0 6px 18px rgba(22,119,255,0.28);
}
.btn-primary:hover { filter: brightness(1.08); background: var(--primary-dark); }
.btn-lg { padding: 15px 36px; font-size: 16px; border-radius: 12px; }

/* ── 轮播 Banner（2026-09-03 比例定为 1920×800 标准全宽） ── */
.hero { position: relative; overflow: hidden; }
.swiper { position: relative; width: 100%; aspect-ratio: 1920 / 800; }
.slide {
  position: absolute; inset: 0; opacity: 0; transition: opacity 0.8s ease;
  display: flex; flex-direction: column; align-items: center; justify-content: flex-end;
  background-size: cover; background-position: center;
}
.slide.active { opacity: 1; }
.slide::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(15,30,70,0.18) 0%, rgba(15,30,70,0.60) 100%);
}
.slide-content { position: relative; z-index: 2; text-align: center; max-width: 860px; padding: 0 24px 110px; }
.slide-content h1 { font-size: 46px; font-weight: 800; margin-bottom: 16px; color: #fff; text-shadow: 0 4px 20px rgba(0,0,0,0.35); }
.slide-content p { font-size: 18px; color: rgba(255,255,255,0.94); margin-bottom: 28px; text-shadow: 0 2px 10px rgba(0,0,0,0.35); }
.slide-content a { display: inline-block; }
.swiper-dots { position: absolute; bottom: 24px; left: 0; right: 0; display: flex; justify-content: center; gap: 10px; z-index: 3; }
.swiper-dots span {
  width: 10px; height: 10px; border-radius: 50%;
  background: rgba(255,255,255,0.5); cursor: pointer; transition: all 0.3s;
}
.swiper-dots span.active { background: #fff; width: 26px; border-radius: 6px; }

/* ── 功能亮点网格（2026-08-31 现代化：纯色品牌蓝，去渐变；2026-09-02 产品介绍模块改为 图片+标题+文本描述） ── */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.feature-card {
  padding: 32px 28px;
  display: flex; flex-direction: column; align-items: flex-start;
  border-radius: 16px;
  overflow: hidden;
  position: relative;
}
/* 2026-09-02 产品介绍模块：图片撑满顶部圆角，标题/文本受 padding 影响（与价值观卡片一致） */
.feature-card:has(> .feature-img) {
  padding-top: 0;
}
.feature-img {
  width: calc(100% + 56px);
  margin: 0 -28px 22px;
  aspect-ratio: 16 / 9;
  background: linear-gradient(135deg, #eef5ff 0%, #d6e4ff 100%);
  display: flex; align-items: center; justify-content: center;
  overflow: hidden;
}
.feature-img.placeholder,
.feature-img.img-error {
  background: linear-gradient(135deg, rgba(22,119,255,0.10) 0%, rgba(22,119,255,0.22) 100%);
}
.feature-img img {
  width: 100%; height: 100%;
  object-fit: cover; object-position: center;
  display: block;
}
.feature-card h3 { font-size: 19px; margin-bottom: 10px; color: var(--text-main); font-weight: 700; }
.feature-card p { color: var(--text-sub); font-size: 14.5px; line-height: 1.75; flex: 1; }
.feature-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.feature-tags span {
  font-size: 12.5px; padding: 5px 12px; border-radius: 20px;
  background: #f0f5ff; border: 1px solid #d6e4ff;
  color: var(--primary); font-weight: 500;
}

/* ── 下载区块 ── */
.download-zone { text-align: center; }
.download-zone .version-badge {
  display: inline-block; padding: 6px 18px; border-radius: 22px; font-size: 14px;
  background: rgba(22,119,255,0.08); border: 1px solid rgba(22,119,255,0.22);
  color: var(--primary); font-weight: 600;
  margin-bottom: 18px;
}
.download-zone h2 { font-size: 32px; margin-bottom: 14px; color: var(--text-main); }
.download-zone .dl-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; margin-top: 26px; }
.changelog-box { margin: 30px auto 0; max-width: 760px; text-align: left; padding: 26px 30px; }
.changelog-box h4 { font-size: 16px; margin-bottom: 14px; color: var(--text-main); }
.changelog-box ul li {
  position: relative; padding-left: 20px; color: var(--text-sub); font-size: 14px;
  margin-bottom: 8px;
}
.changelog-box ul li::before {
  content: ""; position: absolute; left: 0; top: 9px;
  width: 7px; height: 7px; border-radius: 50%; background: var(--accent);
}

/* ── 版本下载页 ── */
.version-card { padding: 26px 30px; margin-bottom: 20px; display: flex; justify-content: space-between; align-items: center; gap: 20px; flex-wrap: wrap; }
.version-info h3 { font-size: 20px; margin-bottom: 6px; display: flex; align-items: center; gap: 10px; color: var(--text-main); }
.version-info .meta { color: var(--text-dim); font-size: 13px; margin-bottom: 10px; }
.version-info ul { margin-top: 10px; }
.version-info ul li { color: var(--text-sub); font-size: 14px; padding-left: 16px; position: relative; margin-bottom: 5px; }
.version-info ul li::before { content: "•"; position: absolute; left: 0; color: var(--accent); }
.version-actions { display: flex; flex-direction: column; gap: 10px; min-width: 180px; }
.latest-tag {
  font-size: 12px; padding: 3px 10px; border-radius: 20px;
  background: linear-gradient(135deg, #ff9a3d, #ff6b2c);
  color: #fff; font-weight: 700;
}

/* ── 关于页 ── */
.timeline { position: relative; max-width: 760px; margin: 0 auto; padding-left: 30px; }
.timeline::before {
  content: ""; position: absolute; left: 8px; top: 4px; bottom: 4px; width: 2px;
  background: linear-gradient(180deg, rgba(22,119,255,0.6), rgba(22,119,255,0.12));
}
.timeline-item { position: relative; padding: 18px 0 26px 26px; }
.timeline-item::before {
  content: ""; position: absolute; left: -26px; top: 24px;
  width: 18px; height: 18px; border-radius: 50%;
  background: var(--primary);
  border: 3px solid #fff;
  box-shadow: 0 2px 8px rgba(22,119,255,0.3);
}
.timeline-item .date { color: var(--accent); font-size: 14px; font-weight: 600; margin-bottom: 4px; }
.timeline-item .event { color: var(--text-sub); font-size: 15px; }

/* ── 联系页 ── */
.contact-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 26px; }
.contact-item { display: flex; align-items: flex-start; gap: 14px; padding: 18px 20px; margin-bottom: 14px; }
.contact-item .icon { font-size: 22px; }
.contact-item .label { color: var(--text-dim); font-size: 13px; }
.contact-item .value { color: var(--text-main); font-size: 16px; font-weight: 600; }
.form-card { padding: 32px 30px; }
.form-card h3 { font-size: 20px; margin-bottom: 20px; color: var(--text-main); }
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-size: 14px; color: var(--text-sub); margin-bottom: 7px; }
.form-group input, .form-group textarea {
  width: 100%; padding: 12px 14px; border-radius: 10px;
  background: #fff;
  border: 1px solid var(--border);
  color: var(--text-main); font-size: 15px; font-family: inherit;
  outline: none; transition: all 0.2s;
}
.form-group input::placeholder, .form-group textarea::placeholder { color: var(--text-dim); }
.form-group input:focus, .form-group textarea:focus {
  border-color: var(--accent); background: #fff;
  box-shadow: 0 0 0 3px rgba(22,119,255,0.14);
}
.form-group textarea { min-height: 120px; resize: vertical; }
.form-tip { font-size: 13px; color: var(--text-dim); margin-top: 8px; }

/* ── 页脚 ── */
.footer {
  border-top: 1px solid var(--border);
  background: #ffffff;
  padding: 30px 0 26px;
  margin-top: 40px;
}
.footer .container { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 14px; }
.footer .links a { color: var(--text-dim); font-size: 14px; margin-left: 18px; }
.footer .links a:hover { color: var(--primary); }
.footer .copyright { color: var(--text-dim); font-size: 13px; }
.footer .copyright a { color: var(--text-dim); }
.footer .copyright a:hover { color: var(--primary); }

/* ── 加载 / 空状态 / 提示 ── */
.loading {
  text-align: center; padding: 40px 0; color: var(--text-dim); font-size: 14px;
}
.empty { text-align: center; padding: 30px 0; color: var(--text-dim); font-size: 14px; }
.alert {
  padding: 13px 16px; border-radius: 10px; font-size: 14px; margin-top: 14px;
  display: none;
}
.alert.show { display: block; }
.alert-success { background: rgba(52,199,123,0.10); border: 1px solid rgba(52,199,123,0.4); color: #0f9d58; }
.alert-error { background: rgba(239,83,80,0.10); border: 1px solid rgba(239,83,80,0.4); color: #d93025; }

/* ── 响应式 ── */
@media (max-width: 900px) {
  .grid-3, .grid-4, .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; }
  .slide-content h1 { font-size: 32px; }
  .swiper { height: 400px; }
  .nav-toggle { display: block; }
  .nav-links {
    position: fixed; top: 64px; left: 0; right: 0;
    flex-direction: column; background: rgba(255,255,255,0.98);
    backdrop-filter: blur(14px); padding: 12px 20px 20px;
    border-bottom: 1px solid var(--border);
    display: none;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px 16px; }
}
@media (max-width: 560px) {
  .grid-3, .grid-4, .grid-2, .feature-grid { grid-template-columns: 1fr; }
  .section { padding: 44px 0; }
  .section-title { font-size: 23px; }
}