/* Reset & Basic Styles */
* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: "Helvetica Neue", Arial, "Heiti TC", sans-serif; line-height: 1.6; color: #333; background-color: #fdfdfd; }
a { text-decoration: none; color: #333; transition: 0.3s; }
a:hover { color: #8D6E63; }
img { max-width: 100%; height: auto; display: block; }

/* Layout */
.container { max-width: 1200px; margin: 0 auto; padding: 20px; }

/* Header & Navigation (Unified Module) */
header { background: #fff; box-shadow: 0 2px 5px rgba(0,0,0,0.05); position: sticky; top: 0; z-index: 1000; }
nav { display: flex; justify-content: space-between; align-items: center; max-width: 1200px; margin: 0 auto; padding: 15px 20px; }
.logo a { font-size: 1.5rem; font-weight: bold; color: #5D4037; }

/* Desktop Menu */
#nav-menu { display: flex; list-style: none; gap: 20px; }
#nav-menu li a { font-weight: 500; padding: 5px 10px; }

/* Hamburger Toggle (Hidden on Desktop) */
.menu-toggle { display: none; font-size: 1.8rem; cursor: pointer; color: #5D4037; }

/* Responsive Design */
@media (max-width: 768px) {
    .menu-toggle { display: block; } /* Show on mobile */
    
    #nav-menu {
        display: none; /* Hidden by default on mobile */
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: #fff;
        box-shadow: 0 5px 10px rgba(0,0,0,0.1);
        padding: 0;
    }

    #nav-menu.active { display: flex; } /* Show when active */

    #nav-menu li { text-align: center; border-bottom: 1px solid #eee; }
    #nav-menu li a { display: block; padding: 15px; }
}

/* Hero Section */
.hero { text-align: center; padding: 40px 20px; background: #fafafa; margin-bottom: 30px; }
.hero h1 { font-size: 2.5rem; color: #5D4037; margin-bottom: 10px; }
.hero p { font-size: 1.2rem; color: #666; margin-bottom: 20px; }

/* Article Content */
article { max-width: 800px; margin: 0 auto; background: #fff; padding: 0 0 40px 0; }
article h1 { font-size: 2rem; margin-bottom: 15px; color: #5D4037; }
article h2 { font-size: 1.5rem; margin: 25px 0 15px; color: #8D6E63; border-left: 4px solid #8D6E63; padding-left: 10px; }
article h3 { font-size: 1.2rem; margin: 20px 0 10px; font-weight: bold; }
article p, article ul { margin-bottom: 15px; font-size: 1.1rem; }
article ul { padding-left: 20px; }
article img { border-radius: 8px; margin: 20px 0; }

/* Footer */
footer { background: #5D4037; color: #fff; text-align: center; padding: 20px; margin-top: 50px; }
footer a { color: #fff; text-decoration: underline; }