/* Giao diện EVN Modern */
:root { --primary: #0073aa; --accent: #ff5722; --bg: #f0f2f5; --text: #333; --white: #fff; }
body { font-family: 'Inter', sans-serif; background-color: var(--bg); color: var(--text); margin: 0; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
a { text-decoration: none; color: var(--primary); transition: 0.2s; }

/* Header */
.site-header { background: var(--white); box-shadow: 0 2px 10px rgba(0,0,0,0.05); position: sticky; top: 0; z-index: 99; }
.header-inner { display: flex; justify-content: space-between; align-items: center; min-height: 70px; padding: 10px 20px; }
.site-title { margin: 0; font-size: 24px; font-weight: 800; }
.site-title span { background: var(--primary); color: white; padding: 2px 8px; border-radius: 4px; }

/* Menu */
.main-navigation ul { display: flex; list-style: none; margin: 0; padding: 0; gap: 25px; }
.main-navigation a { color: #555; font-weight: 600; font-size: 15px; }
.main-navigation a:hover { color: var(--primary); }

/* Layout */
.site-content { display: flex; gap: 40px; margin-top: 40px; margin-bottom: 40px; min-height: 60vh; }
.main-area { flex: 3; }
.sidebar-area { flex: 1; }

/* Card UI */
.card { background: var(--white); border-radius: 12px; padding: 30px; box-shadow: 0 5px 20px rgba(0,0,0,0.03); margin-bottom: 30px; border: 1px solid rgba(0,0,0,0.02); }
.page-title { margin-top: 0; color: var(--primary); font-size: 28px; border-bottom: 2px solid #f0f0f0; padding-bottom: 15px; margin-bottom: 20px; }

/* Sidebar Widgets */
.widget { background: var(--white); border-radius: 12px; padding: 25px; margin-bottom: 20px; box-shadow: 0 2px 10px rgba(0,0,0,0.02); }
.widget-title { margin-top: 0; font-size: 18px; border-left: 4px solid var(--accent); padding-left: 10px; color: #333; }
.widget ul { list-style: none; padding: 0; margin: 0; }
.widget li { padding: 8px 0; border-bottom: 1px solid #eee; }

/* Footer */
.site-footer { background: #2c3e50; color: #ecf0f1; padding: 30px 0; font-size: 14px; }
.footer-inner { display: flex; justify-content: space-between; }

/* Responsive */
@media(max-width: 768px) {
    .site-content { flex-direction: column; }
    .header-inner { flex-direction: column; gap: 15px; }
    .main-navigation ul { flex-wrap: wrap; justify-content: center; }
}