* { margin: 0; padding: 0; box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: #333;
            background: linear-gradient(135deg, #f5f7fa 0%, #e4edf5 100%);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        a { color: #2563eb; text-decoration: none; transition: color 0.3s; }
        a:hover { color: #1d4ed8; }
        img { max-width: 100%; height: auto; display: block; }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background: #1e293b;
            color: white;
            padding: 1rem 0;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .logo a {
            font-size: 2.2rem;
            font-weight: 800;
            color: #60a5fa;
            letter-spacing: -1px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .logo a:hover { color: #93c5fd; }
        .logo i { font-size: 2rem; }
        .nav-desktop { display: flex; gap: 2rem; }
        .nav-desktop a {
            color: #cbd5e1;
            font-weight: 600;
            padding: 0.5rem 0;
            position: relative;
        }
        .nav-desktop a:hover { color: white; }
        .nav-desktop a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 3px;
            background: #60a5fa;
            transition: width 0.3s;
        }
        .nav-desktop a:hover::after { width: 100%; }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
        }
        .nav-mobile {
            display: none;
            flex-direction: column;
            background: #1e293b;
            position: absolute;
            top: 100%;
            left: 0;
            width: 100%;
            padding: 1rem;
            box-shadow: 0 5px 15px rgba(0,0,0,0.2);
        }
        .nav-mobile.active { display: flex; }
        .nav-mobile a {
            color: #cbd5e1;
            padding: 0.8rem 1rem;
            border-bottom: 1px solid #334155;
        }
        .nav-mobile a:hover { background: #334155; color: white; }
        .breadcrumb {
            background: #f8fafc;
            padding: 1rem 0;
            border-bottom: 1px solid #e2e8f0;
            font-size: 0.9rem;
        }
        .breadcrumb a { color: #64748b; }
        .breadcrumb a:hover { color: #2563eb; }
        .breadcrumb span { color: #94a3b8; }
        main { flex: 1; padding: 2rem 0; }
        article { background: white; border-radius: 12px; padding: 2.5rem; box-shadow: 0 6px 20px rgba(0,0,0,0.08); }
        h1 {
            font-size: 2.8rem;
            color: #1e293b;
            margin-bottom: 1.5rem;
            line-height: 1.2;
            border-left: 6px solid #2563eb;
            padding-left: 1rem;
        }
        h2 {
            font-size: 2rem;
            color: #334155;
            margin: 2.5rem 0 1.2rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px dashed #cbd5e1;
        }
        h3 {
            font-size: 1.5rem;
            color: #475569;
            margin: 2rem 0 1rem;
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
            font-size: 1.1rem;
            color: #4b5563;
        }
        .highlight {
            background: linear-gradient(120deg, #dbeafe 0%, #eff6ff 100%);
            border-left: 5px solid #2563eb;
            padding: 1.5rem;
            margin: 2rem 0;
            border-radius: 0 8px 8px 0;
        }
        .highlight p { margin-bottom: 0; }
        emoji { font-size: 1.2em; margin-right: 8px; }
        .key-term { font-weight: 800; color: #1d4ed8; }
        .img-container {
            margin: 2.5rem auto;
            text-align: center;
            max-width: 800px;
        }
        .img-container img {
            border-radius: 10px;
            box-shadow: 0 8px 25px rgba(0,0,0,0.15);
            border: 1px solid #e5e7eb;
            transition: transform 0.4s;
        }
        .img-container img:hover { transform: scale(1.02); }
        .img-caption {
            font-style: italic;
            color: #6b7280;
            margin-top: 0.8rem;
            font-size: 0.95rem;
        }
        .interactive-section {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
            margin: 3rem 0;
        }
        .form-box {
            background: #f8fafc;
            border-radius: 10px;
            padding: 1.8rem;
            border: 1px solid #e2e8f0;
            transition: box-shadow 0.3s, transform 0.3s;
        }
        .form-box:hover {
            box-shadow: 0 10px 25px rgba(0,0,0,0.1);
            transform: translateY(-5px);
        }
        .form-title { font-size: 1.5rem; margin-bottom: 1.2rem; color: #1e293b; }
        input, textarea, select {
            width: 100%;
            padding: 0.9rem;
            margin-bottom: 1.2rem;
            border: 1px solid #cbd5e1;
            border-radius: 6px;
            font-family: inherit;
            font-size: 1rem;
            transition: border 0.3s;
        }
        input:focus, textarea:focus, select:focus {
            outline: none;
            border-color: #60a5fa;
            box-shadow: 0 0 0 3px rgba(96, 165, 250, 0.2);
        }
        button {
            background: linear-gradient(to right, #2563eb, #3b82f6);
            color: white;
            border: none;
            padding: 0.9rem 1.8rem;
            border-radius: 6px;
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            transition: background 0.3s, transform 0.2s;
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }
        button:hover {
            background: linear-gradient(to right, #1d4ed8, #2563eb);
            transform: translateY(-2px);
        }
        .stars {
            display: flex;
            gap: 10px;
            margin-bottom: 1.2rem;
        }
        .star {
            font-size: 1.8rem;
            color: #d1d5db;
            cursor: pointer;
            transition: color 0.2s;
        }
        .star:hover,
        .star.active { color: #fbbf24; }
        .footer-links {
            background: #1e293b;
            padding: 2.5rem 0;
            margin-top: 3rem;
        }
        .web-link {
            display: inline-block;
            background: #334155;
            color: #cbd5e1;
            padding: 0.8rem 1.5rem;
            margin: 0.5rem;
            border-radius: 30px;
            transition: all 0.3s;
            font-size: 0.95rem;
        }
        .web-link:hover {
            background: #60a5fa;
            color: white;
            transform: translateY(-3px);
        }
        .links-container {
            text-align: center;
            max-width: 1000px;
            margin: 0 auto;
        }
        .copyright {
            background: #0f172a;
            color: #94a3b8;
            text-align: center;
            padding: 1.5rem;
            font-size: 0.9rem;
        }
        @media (max-width: 768px) {
            .header-container { flex-wrap: wrap; }
            .nav-desktop { display: none; }
            .hamburger { display: block; }
            h1 { font-size: 2.2rem; }
            h2 { font-size: 1.7rem; }
            article { padding: 1.5rem; }
            .interactive-section { grid-template-columns: 1fr; }
        }