:root{--primary-color:#4361ee;--secondary-color:#3a0ca3;--accent-color:#7209b7;--light-color:#f8f9fa;--dark-color:#212529;--gray-color:#6c757d;--success-color:#4cc9f0;--warning-color:#f72585;--json-color:#f7df1e;--valid-color:#06d6a0;--error-color:#ef476f;--border-radius:12px;--box-shadow:0 8px 24px rgba(0,0,0,0.1);--transition:all 0.3s ease}*{margin:0;padding:0;box-sizing:border-box;font-family:'Segoe UI','Microsoft YaHei',sans-serif}body{background-color:#f0f2f5;color:var(--dark-color);line-height:1.6;min-height:100vh;display:flex;flex-direction:column}.container{width:100%;max-width:1200px;margin:0 auto;padding:0 20px}header{background:linear-gradient(135deg,var(--primary-color),var(--secondary-color));color:white;padding:20px 0;box-shadow:0 4px 12px rgba(0,0,0,0.1);position:sticky;top:0;z-index:100}.header-content{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:15px}.logo{display:flex;align-items:center;gap:15px;flex-shrink:0}.logo i{font-size:2.5rem}.logo h1{font-size:1.8rem;font-weight:700;white-space:nowrap}.logo span{color:var(--success-color)}nav{flex:1 1 auto;min-width:0}nav ul{display:flex;list-style:none;gap:5px;flex-wrap:wrap;justify-content:flex-end;margin:0;padding:0}nav li{position:relative}nav a{color:white;text-decoration:none;font-weight:600;font-size:1.1rem;padding:8px 12px;border-radius:6px;transition:var(--transition);display:inline-block;white-space:nowrap}nav a:hover,nav a.active{background-color:rgba(255,255,255,0.2)}.dropdown-menu{position:absolute;top:100%;right:0;left:auto;width:500px;background:white;border-radius:8px;box-shadow:var(--box-shadow);padding:12px;opacity:0;visibility:hidden;transform:translateY(10px);transition:all 0.2s ease;z-index:1000;list-style:none;display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:8px}.dropdown:hover > .dropdown-menu{opacity:1;visibility:visible;transform:translateY(0)}.dropdown-menu li{width:100%;margin:0;padding:0}.dropdown-menu a{color:var(--dark-color);padding:8px 10px;display:block;font-weight:400;font-size:0.95rem;border-radius:4px;white-space:normal;word-break:break-word;background-color:transparent;transition:background-color 0.2s}.dropdown-menu a:hover{background-color:rgba(67,97,238,0.1);color:var(--primary-color)}.dropdown > a i{margin-left:5px;font-size:0.8rem;transition:transform 0.2s}.dropdown:hover > a i{transform:rotate(180deg)}.mobile-menu-btn{display:none;font-size:1.5rem;background:none;border:none;color:white;cursor:pointer}main{padding:40px 0;flex:1}.hero-section{text-align:center;padding:60px 20px;background:linear-gradient(135deg,rgba(67,97,238,0.05),rgba(58,12,163,0.05));border-radius:var(--border-radius);margin-bottom:50px;position:relative;overflow:hidden}.hero-section::before{content:'';position:absolute;top:0;left:0;width:100%;height:100%;background:url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" preserveAspectRatio="none"><path d="M0,0 L100,0 L100,100 Z" fill="rgba(67,97,238,0.03)"/></svg>');background-size:cover;z-index:0}.hero-content{position:relative;z-index:1}.hero-section h2{font-size:2.8rem;color:var(--secondary-color);margin-bottom:20px}.hero-section p{font-size:1.2rem;color:var(--gray-color);max-width:800px;margin:0 auto 30px}.highlight{color:var(--primary-color);font-weight:700;background:linear-gradient(135deg,var(--primary-color),var(--accent-color));-webkit-background-clip:text;-webkit-text-fill-color:transparent}.cta-button{display:inline-block;background-color:var(--primary-color);color:white;padding:15px 30px;border-radius:50px;font-weight:600;font-size:1.1rem;text-decoration:none;transition:var(--transition);box-shadow:0 6px 20px rgba(67,97,238,0.3);border:2px solid transparent}.cta-button:hover{background-color:var(--secondary-color);transform:translateY(-3px);box-shadow:0 10px 25px rgba(67,97,238,0.4);border-color:rgba(255,255,255,0.3)}.section-title{font-size:2rem;margin-bottom:40px;color:var(--secondary-color);text-align:center;display:flex;align-items:center;justify-content:center;gap:10px}.section-title i{color:var(--accent-color)}.features-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(350px,1fr));gap:30px;margin-bottom:60px}.feature-card{background:white;border-radius:var(--border-radius);padding:30px;box-shadow:var(--box-shadow);transition:var(--transition);border:2px solid transparent;display:flex;flex-direction:column;align-items:center;text-align:center}.feature-card:hover{transform:translateY(-10px);border-color:var(--primary-color);box-shadow:0 15px 30px rgba(0,0,0,0.15)}.feature-card i{font-size:3rem;color:var(--primary-color);margin-bottom:20px;background:linear-gradient(135deg,var(--primary-color),var(--accent-color));-webkit-background-clip:text;-webkit-text-fill-color:transparent}.feature-card h3{font-size:1.6rem;margin-bottom:15px;color:var(--dark-color)}.feature-card p{color:var(--gray-color);margin-bottom:20px;flex-grow:1}.feature-link{background-color:var(--primary-color);color:white;border:none;padding:10px 25px;border-radius:6px;font-weight:600;cursor:pointer;transition:var(--transition);text-decoration:none;display:inline-block;margin-top:10px}.feature-link:hover{background-color:var(--secondary-color)}.platform-intro{background-color:white;border-radius:var(--border-radius);padding:50px;box-shadow:var(--box-shadow);margin-bottom:60px;position:relative;overflow:hidden}.platform-intro::before{content:'';position:absolute;top:0;left:0;width:8px;height:100%;background:linear-gradient(to bottom,var(--primary-color),var(--accent-color))}.intro-content{position:relative;z-index:1}.intro-content h2{font-size:2.2rem;color:var(--secondary-color);margin-bottom:20px}.intro-content p{font-size:1.1rem;color:var(--dark-color);margin-bottom:25px;line-height:1.8}.intro-highlight{background-color:rgba(67,97,238,0.1);padding:30px;border-radius:var(--border-radius);margin:30px 0;border-left:4px solid var(--primary-color)}.intro-highlight p{font-size:1.3rem;font-weight:600;color:var(--secondary-color);margin:0;text-align:center}.stats-section{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:20px;margin-bottom:60px}.stat-card{background:linear-gradient(135deg,var(--primary-color),var(--secondary-color));color:white;border-radius:var(--border-radius);padding:30px 20px;text-align:center;transition:var(--transition)}.stat-card:nth-child(2){background:linear-gradient(135deg,var(--accent-color),#f72585)}.stat-card:nth-child(3){background:linear-gradient(135deg,var(--success-color),#06d6a0)}.stat-card:nth-child(4){background:linear-gradient(135deg,var(--json-color),#f7b731)}.stat-card:hover{transform:translateY(-5px);box-shadow:0 10px 25px rgba(0,0,0,0.2)}.stat-value{font-size:2.5rem;font-weight:700;margin-bottom:10px}.stat-label{font-size:1.1rem;opacity:0.9}footer{background-color:var(--dark-color);color:white;padding:40px 0;margin-top:auto}.footer-content{display:flex;flex-wrap:wrap;justify-content:space-between;gap:40px}.footer-section{flex:1;min-width:250px}.footer-section h3{font-size:1.3rem;margin-bottom:20px;color:var(--success-color)}.footer-links{list-style:none}.footer-links li{margin-bottom:10px}.footer-links a{color:#ddd;text-decoration:none;transition:var(--transition)}.footer-links a:hover{color:var(--success-color)}.copyright{text-align:center;margin-top:40px;padding-top:20px;border-top:1px solid #444;color:#aaa;font-size:0.9rem}.tool-section{display:none;animation:fadeIn 0.5s ease}.tool-section.active{display:block}@keyframes fadeIn{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.tool-detail{background:white;border-radius:var(--border-radius);padding:30px;box-shadow:var(--box-shadow);margin-top:30px}.tool-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:25px;padding-bottom:15px;border-bottom:2px solid #f0f2f5}.tool-header h2{font-size:1.6rem;color:var(--secondary-color)}.close-tool{background:none;border:none;font-size:1.5rem;color:var(--gray-color);cursor:pointer;transition:var(--transition)}.close-tool:hover{color:var(--warning-color)}@media (min-width:769px) and (max-width:1000px){nav ul{flex-direction:column;align-items:flex-end;gap:8px}}@media (max-width:768px){.header-content{flex-direction:column;align-items:stretch}.logo{justify-content:center}nav ul{flex-direction:column;gap:10px;text-align:center;justify-content:center}.mobile-menu-btn{display:block;position:absolute;top:25px;right:20px}.mobile-menu{display:none;width:100%;margin-top:15px}.mobile-menu.show{display:block}.dropdown-menu{position:static;width:auto;opacity:1;visibility:visible;transform:none;box-shadow:none;background:transparent;padding:0 0 0 20px;margin-top:5px;display:none;grid-template-columns:1fr;gap:0}.dropdown.open > .dropdown-menu{display:grid}.dropdown-menu li{width:100%}.dropdown-menu a{color:white;padding:8px 12px;background-color:rgba(255,255,255,0.1);border-radius:6px;margin-bottom:5px;white-space:nowrap}.dropdown-menu a:hover{background-color:rgba(255,255,255,0.2)}.dropdown.open > a i{transform:rotate(180deg)}.hero-section h2{font-size:2.2rem}.hero-section p{font-size:1.1rem}.features-grid{grid-template-columns:1fr}.platform-intro{padding:30px}.section-title{font-size:1.8rem}.stats-section{grid-template-columns:repeat(2,1fr)}.footer-content{flex-direction:column;align-items:center;text-align:center}}@keyframes fadeInUp{from{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}.animate-on-scroll{animation:fadeInUp 0.6s ease forwards}.hidden{opacity:0}