/* =====================================================================
   干活呗财税官网 - 全局样式 (PC + 移动端响应式)
   主色调: 科技蓝 + 深灰, 体现财税合规专业可靠
   ===================================================================== */
:root {
  --primary: #1e3a8a;        /* 深蓝 主色 */
  --primary-light: #2563eb;  /* 亮蓝 */
  --primary-dark: #0f2461;
  --accent: #f59e0b;         /* 点缀橙(呼应LOGO橙) */
  --accent-red: #dc2626;     /* 红(呼应LOGO) */
  --gray-900: #111827;
  --gray-700: #374151;
  --gray-500: #6b7280;
  --gray-300: #d1d5db;
  --gray-100: #f3f4f6;
  --bg: #ffffff;
  --bg-gray: #f8fafc;
  --radius: 12px;
  --shadow: 0 4px 24px rgba(17, 24, 39, .08);
  --shadow-lg: 0 8px 40px rgba(17, 24, 39, .12);
  --max-w: 1200px;
  --header-h: 72px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--gray-900);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
ul { list-style: none; }
button { cursor: pointer; font-family: inherit; }
input, textarea, select { font-family: inherit; }

.container { max-width: var(--max-w); margin: 0 auto; padding: 0 24px; }
.section { padding: 72px 0; }
.section-gray { background: var(--bg-gray); }

/* 标题 */
.section-head { text-align: center; margin-bottom: 48px; }
.section-head .kicker {
  display: inline-block; color: var(--primary-light); font-weight: 600;
  letter-spacing: 2px; text-transform: uppercase; font-size: 13px; margin-bottom: 12px;
}
.section-head h2 { font-size: 32px; font-weight: 700; color: var(--gray-900); }
.section-head p { color: var(--gray-500); margin-top: 12px; max-width: 640px; margin-left: auto; margin-right: auto; }

/* 按钮 */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 28px; border-radius: 8px; font-size: 15px; font-weight: 600;
  border: none; transition: all .25s; line-height: 1.4;
}
.btn-primary { background: var(--primary-light); color: #fff; }
.btn-primary:hover { background: var(--primary); transform: translateY(-2px); box-shadow: var(--shadow); }
.btn-outline { background: transparent; color: var(--primary-light); border: 1.5px solid var(--primary-light); }
.btn-outline:hover { background: var(--primary-light); color: #fff; }
.btn-accent { background: var(--accent); color: #fff; }
.btn-accent:hover { background: #d97706; transform: translateY(-2px); }

/* 顶部导航 */
.header {
  position: sticky; top: 0; z-index: 100; background: rgba(255,255,255,.95);
  backdrop-filter: blur(8px); border-bottom: 1px solid var(--gray-100);
  height: var(--header-h);
}
.header .container { display: flex; align-items: center; justify-content: space-between; height: var(--header-h); }
.logo { display: flex; align-items: center; gap: 10px; }
.logo img { height: 44px; }
.logo .logo-text { font-weight: 800; font-size: 20px; color: var(--primary-dark); letter-spacing: 1px; }
.nav { display: flex; align-items: center; gap: 32px; }
.nav a { font-size: 15px; color: var(--gray-700); font-weight: 500; position: relative; transition: color .2s; }
.nav a:hover, .nav a.active { color: var(--primary-light); }
.nav a.active::after {
  content: ''; position: absolute; left: 0; right: 0; bottom: -6px; height: 2px; background: var(--primary-light); border-radius: 2px;
}
.header-cta { display: flex; align-items: center; gap: 16px; }
.header-phone { display: flex; align-items: center; gap: 8px; color: var(--gray-700); font-weight: 600; }
.header-phone .icon { color: var(--accent); }

/* 汉堡菜单 */
.hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; background: none; border: none; padding: 8px; }
.hamburger span { width: 24px; height: 2.5px; background: var(--gray-900); border-radius: 2px; transition: .3s; }

/* 移动端导航 */
.mobile-nav {
  display: none; position: fixed; top: var(--header-h); left: 0; right: 0; background: #fff;
  box-shadow: var(--shadow); padding: 16px 24px; z-index: 99;
}
.mobile-nav a { display: block; padding: 14px 0; border-bottom: 1px solid var(--gray-100); font-size: 16px; color: var(--gray-700); }

/* 面包屑 */
.breadcrumb { background: var(--bg-gray); padding: 16px 0; font-size: 14px; color: var(--gray-500); }
.breadcrumb a { color: var(--gray-500); }
.breadcrumb a:hover { color: var(--primary-light); }
.breadcrumb span { margin: 0 8px; color: var(--gray-300); }

/* 卡片 */
.card { background: #fff; border-radius: var(--radius); box-shadow: var(--shadow); overflow: hidden; transition: all .3s; }
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }

/* 页脚 */
.footer { background: #0f172a; color: #cbd5e1; padding: 56px 0 24px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1.5fr; gap: 40px; }
.footer h4 { color: #fff; font-size: 16px; margin-bottom: 20px; }
.footer a { color: #94a3b8; display: block; padding: 6px 0; font-size: 14px; }
.footer a:hover { color: #fff; }
.footer .footer-brand { font-size: 20px; font-weight: 700; color: #fff; margin-bottom: 12px; }
.footer .footer-desc { font-size: 14px; color: #94a3b8; line-height: 1.8; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.1); margin-top: 40px; padding-top: 20px; text-align: center; font-size: 13px; color: #64748b; }

/* 表单 */
.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 8px; color: var(--gray-700); }
.form-control {
  width: 100%; padding: 12px 14px; border: 1.5px solid var(--gray-300); border-radius: 8px;
  font-size: 15px; transition: border .2s; background: #fff;
}
.form-control:focus { outline: none; border-color: var(--primary-light); }
textarea.form-control { resize: vertical; min-height: 100px; }

/* 提示 */
.tip { font-size: 13px; color: var(--gray-500); margin-top: 6px; }

/* 广告悬浮 */
.float-consult {
  position: fixed; right: 24px; bottom: 100px; z-index: 90; background: var(--primary-light);
  color: #fff; padding: 14px 20px; border-radius: 40px; box-shadow: var(--shadow-lg);
  display: flex; align-items: center; gap: 8px; font-weight: 600; font-size: 14px;
}
.float-consult:hover { background: var(--primary); }

/* 移动端底部快捷条 */
.mobile-bar { display: none; }

/* ===== 响应式 ===== */
@media (max-width: 980px) {
  .nav, .header-phone { display: none; }
  .hamburger { display: flex; }
  .mobile-nav.open { display: block; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 24px; }
  .section { padding: 48px 0; }
  .section-head h2 { font-size: 26px; }
}

@media (max-width: 640px) {
  .container { padding: 0 16px; }
  .mobile-bar {
    display: flex; position: fixed; bottom: 0; left: 0; right: 0; height: 56px;
    background: #fff; box-shadow: 0 -2px 12px rgba(0,0,0,.08); z-index: 95;
  }
  .mobile-bar a { flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center; font-size: 11px; color: var(--gray-700); gap: 3px; }
  .mobile-bar a.call { background: var(--primary-light); color: #fff; }
  .mobile-bar a i { font-size: 18px; }
  .footer-grid { grid-template-columns: 1fr; }
  .float-consult { display: none; }
  body { padding-bottom: 56px; }
}