/* 工业商务风 Base Style */
:root {
    --primary-color: #1b497e;
    --accent-color: #d9534f;
    --bg-gray: #f4f6f9;
    --border-color: #dcdcdc;
    --text-dark: #333;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; background-color: var(--bg-gray); color: var(--text-dark); line-height: 1.6; font-size: 14px; }
a { color: var(--primary-color); text-decoration: none; }
a:hover { text-decoration: underline; }

.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 15px; }

/* 头部导航 */
header { background: var(--primary-color); color: #fff; }
.nav-bar { display: flex; justify-content: space-between; align-items: center; padding: 12px 0; }
.logo { font-size: 22px; font-weight: bold; color: #fff; }
.logo span { font-size: 14px; color: #ffca28; margin-left: 5px; }
.nav-menu { display: flex; list-style: none; gap: 20px; }
.nav-menu a { color: #fff; font-size: 15px; font-weight: 500; }

/* Banner */
.hero-banner { background: linear-gradient(135deg, #1b497e 0%, #0d2b4e 100%); color: #fff; padding: 40px 0; text-align: center; border-bottom: 4px solid var(--accent-color); }
.hero-banner h1 { font-size: 32px; margin-bottom: 10px; }
.hero-banner h2 { font-size: 18px; font-weight: normal; color: #e0e0e0; margin-bottom: 15px; }
.hero-banner .login-tip { font-size: 13px; color: #ffeb3b; background: rgba(0,0,0,0.2); display: inline-block; padding: 4px 12px; border-radius: 4px; margin-bottom: 20px; }
.hero-btns .btn { display: inline-block; padding: 10px 20px; border-radius: 4px; margin: 0 5px; font-weight: bold; }
.btn-primary { background: #ff9800; color: #fff; }
.btn-secondary { background: #4caf50; color: #fff; }
.btn-outline { border: 1px solid #fff; color: #fff; }

/* 主体通用卡片 */
.panel { background: #fff; border: 1px solid var(--border-color); border-radius: 4px; margin-top: 20px; padding: 20px; }
.panel-title { font-size: 18px; font-weight: bold; border-left: 4px solid var(--primary-color); padding-left: 10px; margin-bottom: 15px; color: var(--primary-color); }

/* 分类与列表 */
.cate-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(130px, 1fr)); gap: 10px; }
.cate-card { background: #eef3f8; text-align: center; padding: 12px; border-radius: 4px; color: #333; font-weight: bold; border: 1px solid #d0dbe5; }
.cate-card:hover { background: var(--primary-color); color: #fff; text-decoration: none; }

.company-item { border-bottom: 1px dashed var(--border-color); padding: 15px 0; display: flex; justify-content: space-between; align-items: center; }
.company-item:last-child { border-bottom: none; }
.company-info h3 { font-size: 16px; margin-bottom: 5px; }
.company-info p { color: #666; font-size: 13px; margin-bottom: 3px; }
.lock-mask { background: #fff3cd; color: #856404; padding: 6px 12px; border-radius: 4px; font-size: 12px; border: 1px solid #ffeeba; }

/* 表单与弹窗 */
.form-group { margin-bottom: 15px; }
.form-group label { display: block; margin-bottom: 5px; font-weight: bold; }
.form-control { width: 100%; padding: 8px 12px; border: 1px solid #ccc; border-radius: 4px; }
.modal { display: none; position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.5); justify-content: center; align-items: center; z-index: 999; }
.modal-content { background: #fff; padding: 25px; border-radius: 6px; width: 90%; max-width: 400px; text-align: center; }

/* 页脚 */
footer { background: #2c3e50; color: #bdc3c7; padding: 25px 0; margin-top: 40px; text-align: center; font-size: 13px; line-height: 1.8; }

/* 移动端与自适应适配 */
@media (max-width: 768px) {
    .nav-bar { flex-direction: column; gap: 10px; }
    .nav-menu { flex-wrap: wrap; justify-content: center; gap: 10px; }
    .hero-banner h1 { font-size: 24px; }
    .company-item { flex-direction: column; align-items: flex-start; gap: 10px; }
}