:root {
            --primary-color: #2563eb;
            --primary-light: #3b82f6;
            --secondary-color: #06b6d4;
            --text-dark: #1e293b;
            --text-light: #64748b;
            --bg-light: #f8fafc;
            --white: #ffffff;
            --border-color: #e2e8f0;
            --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
            --radius: 8px;
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        
        body {
            color: var(--text-dark);
            background-color: var(--white);
            line-height: 1.6;
            overflow-x: hidden;
        }
        
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        
        header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            transition: background-color 0.3s, box-shadow 0.3s;
        }
        
        header.scrolled {
            background-color: var(--white);
            box-shadow: var(--shadow);
        }
        
        .navbar {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 0;
        }
        
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
        }
        
        .logo img {
            height: 40px;
        }
        
        .logo-text {
            font-size: 1.5rem;
            font-weight: 700;
            background: linear-gradient(90deg, #2563eb, #06b6d4);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        
        .nav-links {
            display: flex;
            gap: 25px;
        }
        
        .nav-links a {
            text-decoration: none;
            color: var(--text-dark);
            font-weight: 500;
            transition: color 0.3s;
        }
        
        header.scrolled .nav-links a {
            color: var(--text-dark);
        }
        
        .nav-links a:hover {
            color: var(--primary-color);
        }
        
        .mobile-menu-btn {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            cursor: pointer;
            color: var(--text-dark);
        }
        
        header.scrolled .mobile-menu-btn {
            color: var(--text-dark);
        }

        .mobile-menu-btn svg {
            display: block;
            width: 1.5rem;
            height: 1.5rem;
            fill: none;
            stroke: currentColor;
            stroke-width: 2;
            stroke-linecap: round;
        }
        
        
        .banner {
            height: 100vh;
            display: flex;
            align-items: center;
            position: relative;
            background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
            overflow: hidden;
        }
        
        .banner::before {
            content: '';
            position: absolute;
            top: 0;
            right: 0;
            width: 50%;
            height: 100%;
            background: url('../assets/hero-ai-research.jpg') no-repeat center center;
            background-size: cover;
            clip-path: polygon(20% 0, 100% 0, 100% 100%, 0% 100%);
        }
        
        .banner-content {
            flex: 0 0 50%;
            max-width: 50%;
            padding-right: 40px;
            position: relative;
            z-index: 2;
        }
        
        .banner-title {
            font-size: 3rem;
            font-weight: 800;
            margin-bottom: 20px;
            line-height: 1.2;
            background: linear-gradient(90deg, #2563eb, #06b6d4);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        
        .banner-desc {
            font-size: 1.2rem;
            color: var(--text-light);
            margin-bottom: 30px;
            min-height: 60px;
        }
        
        .banner-buttons {
            display: flex;
            gap: 15px;
        }
        
        .btn {
            padding: 12px 24px;
            border-radius: var(--radius);
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s;
            text-decoration: none;
            display: inline-block;
        }
        
        .btn-primary {
            background-color: var(--primary-color);
            color: var(--white);
            border: none;
        }
        
        .btn-primary:hover {
            background-color: var(--primary-light);
            transform: translateY(-2px);
            box-shadow: 0 10px 20px rgba(37, 99, 235, 0.2);
        }
        
        .btn-secondary {
            background-color: transparent;
            color: var(--primary-color);
            border: 2px solid var(--primary-color);
        }
        
        .btn-secondary:hover {
            background-color: rgba(37, 99, 235, 0.1);
            transform: translateY(-2px);
        }
        
        
        .section {
            padding: 80px 0;
        }
        
        .section-title {
            text-align: center;
            margin-bottom: 50px;
        }
        
        .section-title h2 {
            font-size: 2.5rem;
            margin-bottom: 15px;
            color: var(--text-dark);
        }
        
        .section-title p {
            color: var(--text-light);
            max-width: 700px;
            margin: 0 auto;
            font-size: 1.1rem;
        }
        
        .system-tabs {
            display: flex;
            justify-content: center;
            margin-bottom: 40px;
            border-bottom: 1px solid var(--border-color);
        }
        
        .tab-btn {
            padding: 15px 30px;
            background: none;
            border: none;
            font-size: 1.1rem;
            font-weight: 600;
            color: var(--text-light);
            cursor: pointer;
            position: relative;
            transition: color 0.3s;
        }
        
        .tab-btn.active {
            color: var(--primary-color);
        }
        
        .tab-btn.active::after {
            content: '';
            position: absolute;
            bottom: -1px;
            left: 0;
            width: 100%;
            height: 3px;
            background-color: var(--primary-color);
            border-radius: 3px 3px 0 0;
        }
        
        .system-content {
            display: none;
        }
        
        .system-content.active {
            display: block;
        }
        
        .features-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 30px;
        }
        
        .feature-card {
            background: var(--white);
            border-radius: var(--radius);
            padding: 25px;
            box-shadow: var(--shadow);
            transition: transform 0.3s;
            border: 1px solid var(--border-color);
        }
        
        .feature-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
        }
        
        .icon-sprite {
            position: absolute;
            width: 0;
            height: 0;
            overflow: hidden;
        }

        .feature-icon {
            width: 2.25rem;
            height: 2.25rem;
            margin-bottom: 15px;
            color: var(--primary-color);
        }

        .feature-icon svg {
            display: block;
            width: 100%;
            height: 100%;
            fill: none;
            stroke: currentColor;
            stroke-width: 1.8;
            stroke-linecap: round;
            stroke-linejoin: round;
        }
        
        .feature-title {
            font-size: 1.2rem;
            margin-bottom: 15px;
            color: var(--text-dark);
        }
        
        .feature-desc {
            color: var(--text-light);
        }
        
        
        .divider {
            background: linear-gradient(135deg, #2563eb 0%, #06b6d4 100%);
            padding: 80px 0;
            text-align: center;
            color: var(--white);
        }
        
        .divider h3 {
            font-size: 2.2rem;
            margin-bottom: 15px;
        }
        
        .divider p {
            max-width: 700px;
            margin: 0 auto;
            font-size: 1.1rem;
            opacity: 0.9;
        }
        
        
        .tabs {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-bottom: 30px;
            justify-content: center;
        }
        
        .tab {
            padding: 8px 16px;
            background: var(--bg-light);
            border: none;
            border-radius: 20px;
            cursor: pointer;
            transition: all 0.3s;
        }
        
        .tab.active {
            background: var(--primary-color);
            color: var(--white);
        }
        
        .templates-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }
        
        .template-card {
            background: var(--white);
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: transform 0.3s;
            border: 1px solid var(--border-color);
        }
        
        .template-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
        }
        
        .template-img {
            height: 180px;
            width: 100%;
            object-fit: cover;
        }
        
        .template-content {
            padding: 20px;
        }
        
        .template-title {
            font-size: 1.1rem;
            margin-bottom: 10px;
            color: var(--text-dark);
        }
        
        .template-desc {
            color: var(--text-light);
            margin-bottom: 15px;
            font-size: 0.9rem;
        }
        
        .template-btn {
            display: block;
            text-align: center;
            background: var(--primary-color);
            color: var(--white);
            padding: 8px 0;
            border-radius: var(--radius);
            text-decoration: none;
            font-weight: 500;
            transition: background 0.3s;
        }
        
        .template-btn:hover {
            background: var(--primary-light);
        }
        
        
        .news-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }
        
        .news-card {
            background: var(--white);
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: transform 0.3s;
            border: 1px solid var(--border-color);
        }
        
        .news-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
        }
        
        .news-img {
            height: 180px;
            width: 100%;
            object-fit: cover;
        }
        
        .news-content {
            padding: 20px;
        }
        
        .news-title {
            font-size: 1.1rem;
            margin-bottom: 10px;
            color: var(--text-dark);
        }
        
        .news-desc {
            color: var(--text-light);
            margin-bottom: 15px;
            font-size: 0.9rem;
        }
        
        .news-btn {
            display: inline-block;
            color: var(--primary-color);
            text-decoration: none;
            font-weight: 500;
            transition: color 0.3s;
        }
        
        .news-btn:hover {
            color: var(--primary-light);
        }
        
        
        footer {
            background-color: var(--text-dark);
            color: var(--white);
            padding: 60px 0 20px;
        }
        
        .footer-content {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 40px;
            margin-bottom: 40px;
        }
        
        .footer-column h3 {
            font-size: 1.2rem;
            margin-bottom: 20px;
            position: relative;
            padding-bottom: 10px;
        }
        
        .footer-column h3::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 40px;
            height: 2px;
            background-color: var(--primary-color);
        }
        
        .footer-links {
            list-style: none;
        }
        
        .footer-links li {
            margin-bottom: 10px;
        }
        
        .footer-links a {
            color: #cbd5e1;
            text-decoration: none;
            transition: color 0.3s;
        }
        
        .footer-links a:hover {
            color: var(--white);
        }
        
        .kf-img {
            max-width: 150px;
            margin-top: 10px;
            border-radius: var(--radius);
        }
.copyright {
            text-align: center;
            color: #94a3b8;
            font-size: 0.9rem;
        }
        
        
        @media (max-width: 992px) {
            .features-grid,
            .templates-grid,
            .news-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            
            .footer-content {
                grid-template-columns: repeat(2, 1fr);
            }
            
            .banner-title {
                font-size: 2.5rem;
            }
        }
        
        @media (max-width: 768px) {
            .nav-links {
                display: none;
                position: absolute;
                top: 100%;
                left: 0;
                width: 100%;
                background-color: var(--white);
                flex-direction: column;
                padding: 20px;
                box-shadow: var(--shadow);
            }
            
            .nav-links.active {
                display: flex;
            }
            
            .nav-links a {
                color: var(--text-dark);
                padding: 10px 0;
            }
            
            .mobile-menu-btn {
                display: block;
            }
            
            .banner {
                flex-direction: column;
                text-align: center;
                height: auto;
                padding: 120px 0 60px;
            }
            
            .banner::before {
                display: none;
            }
            
            .banner-content {
                flex: 1;
                max-width: 100%;
                padding-right: 0;
            }
            
            .banner-buttons {
                justify-content: center;
            }
            
            .features-grid,
            .templates-grid,
            .news-grid {
                grid-template-columns: 1fr;
            }
            
            .footer-content {
                grid-template-columns: 1fr;
            }
            
            .banner-title {
                font-size: 2rem;
            }
        }
        
        
        .typewriter {
            overflow: hidden;
            white-space: normal;
            animation: typing 3.5s steps(40, end);
        }
        
        @keyframes typing {
            from { opacity: 0; }
            to { opacity: 1; }
        }
		        
        
        .templates-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }
        
        .template-card {
            background: var(--white);
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: transform 0.3s;
            border: 1px solid var(--border-color);
            display: none; 
        }
        
        .template-card.active {
            display: block; 
        }
        
        .show-more-container {
            text-align: center;
            margin-top: 40px;
            display: none; 
        }
        
        .show-more-btn {
            background: var(--primary-color);
            color: var(--text-dark);
            border: none;
            padding: 12px 30px;
            border-radius: var(--radius);
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s;
        }
        
        .show-more-btn:hover {
            background: var(--primary-light);
            transform: translateY(-2px);
        }
.news-category {
    display: inline-block;
    margin-bottom: 8px;
    color: var(--primary-color);
    font-size: 0.82rem;
    font-weight: 600;
}

.news-title a {
    color: inherit;
    text-decoration: none;
}

.news-title a:hover {
    color: var(--primary-color);
}

.news-more {
    margin-top: 34px;
    text-align: center;
}

.news-more a {
    display: inline-flex;
    padding: 12px 24px;
    color: var(--white);
    background: var(--primary-color);
    border-radius: var(--radius);
    font-weight: 600;
    text-decoration: none;
    transition: transform 0.2s, background 0.2s;
}

.news-more a:hover {
    background: var(--primary-light);
    transform: translateY(-2px);
}
.nav-links .header-tool-btn {
    padding: 10px 18px;
    color: var(--white);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: var(--radius);
    box-shadow: 0 6px 16px rgba(37, 99, 235, 0.25);
    font-weight: 600;
}

header.scrolled .nav-links .header-tool-btn,
.nav-links .header-tool-btn:hover {
    color: var(--white);
}

.nav-links .header-tool-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 8px 20px rgba(37, 99, 235, 0.32);
}


.copyright .footer-map-link {
    color: #cbd5e1;
    text-decoration: none;
}

.copyright .footer-map-link:hover {
    color: var(--white);
}

.navbar {
    min-height: 72px;
    padding: 8px 0;
}

.nav-links {
    align-items: center;
}

.nav-links a {
    display: inline-flex;
    min-height: 44px;
    align-items: center;
    line-height: 1.2;
    white-space: nowrap;
}

@media (max-width: 1080px) and (min-width: 769px) {
    .nav-links {
        gap: 14px;
    }

    .nav-links a {
        font-size: 0.94rem;
    }

    .nav-links .header-tool-btn {
        padding: 10px 14px;
    }
}

@media (max-width: 768px) {
    .container {
        padding-right: 16px;
        padding-left: 16px;
    }

    header,
    header.scrolled {
        background: rgba(255, 255, 255, 0.97);
        box-shadow: 0 1px 12px rgba(15, 23, 42, 0.08);
        backdrop-filter: blur(12px);
    }

    .navbar {
        min-height: 64px;
        padding: 8px 0;
    }

    .logo img {
        width: 36px;
        height: 36px;
    }

    .logo-text {
        font-size: 1.25rem;
    }

    .nav-links {
        top: calc(100% + 8px);
        right: 12px;
        left: 12px;
        width: auto;
        gap: 2px;
        padding: 10px;
        border: 1px solid var(--border-color);
        border-radius: 14px;
        box-shadow: 0 16px 36px rgba(15, 23, 42, 0.14);
    }

    .nav-links a {
        min-height: 44px;
        padding: 10px 12px;
        border-radius: 9px;
    }

    .nav-links a:hover {
        background: #eff6ff;
    }

    .nav-links .header-tool-btn {
        justify-content: center;
        margin-top: 6px;
        padding: 11px 16px;
    }

    .mobile-menu-btn {
        display: inline-flex;
        width: 44px;
        height: 44px;
        align-items: center;
        justify-content: center;
        border: 1px solid var(--border-color);
        border-radius: 10px;
        background: rgba(255, 255, 255, 0.86);
    }

    .banner {
        min-height: auto;
        padding: 104px 0 52px;
    }

    .banner-title {
        margin-bottom: 16px;
        font-size: clamp(1.75rem, 8vw, 2.25rem);
        line-height: 1.25;
    }

    .banner-desc {
        min-height: 0;
        margin-bottom: 24px;
        font-size: 1rem;
        line-height: 1.75;
    }

    .banner-buttons {
        width: 100%;
        flex-direction: column;
        gap: 10px;
        align-items: stretch;
    }

    .banner-buttons .btn {
        width: 100%;
        min-height: 48px;
        display: inline-flex;
        align-items: center;
        justify-content: center;
    }

    .section {
        padding: 52px 0;
    }

    .section-title {
        margin-bottom: 32px;
    }

    .section-title h2 {
        font-size: clamp(1.7rem, 7vw, 2rem);
        line-height: 1.3;
    }

    .section-title p,
    .divider p {
        font-size: 1rem;
        line-height: 1.75;
    }

    .system-tabs {
        display: grid;
        grid-template-columns: repeat(3, minmax(0, 1fr));
        margin-bottom: 28px;
    }

    .tab-btn {
        min-height: 48px;
        padding: 10px 6px;
        font-size: 0.92rem;
        line-height: 1.3;
    }

    .features-grid,
    .templates-grid,
    .news-grid {
        gap: 18px;
    }

    .feature-card,
    .template-content,
    .news-content {
        padding: 20px;
    }

    .tabs {
        justify-content: flex-start;
        flex-wrap: nowrap;
        padding-bottom: 6px;
        overflow-x: auto;
        scrollbar-width: thin;
    }

    .tab {
        min-height: 42px;
        flex: 0 0 auto;
        padding: 9px 16px;
    }

    .template-img,
    .news-img {
        height: 200px;
    }

    .template-btn,
    .news-more a {
        min-height: 46px;
        display: inline-flex;
        align-items: center;
        justify-content: center;
    }

    .template-btn {
        width: 100%;
    }

    .divider {
        padding: 52px 0;
    }

    .divider h3 {
        font-size: 1.75rem;
        line-height: 1.35;
    }

    footer {
        padding: 48px 0 20px;
    }

    .footer-content {
        gap: 28px;
        margin-bottom: 32px;
    }

    .footer-column h3 {
        margin-bottom: 14px;
    }

    .copyright {
        line-height: 1.8;
        overflow-wrap: anywhere;
    }
}

@media (max-width: 420px) {
    .container {
        padding-right: 14px;
        padding-left: 14px;
    }

    .logo {
        gap: 8px;
    }

    .logo img {
        width: 32px;
        height: 32px;
    }

    .logo-text {
        font-size: 1.15rem;
    }

    .banner {
        padding-top: 92px;
    }

    .banner-title {
        font-size: 1.75rem;
    }

    .system-tabs {
        grid-template-columns: 1fr;
        gap: 6px;
        border-bottom: 0;
    }

    .tab-btn {
        border: 1px solid var(--border-color);
        border-radius: 9px;
    }

    .tab-btn.active {
        color: var(--white);
        background: var(--primary-color);
    }

    .tab-btn.active::after {
        display: none;
    }
}