:root{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,Noto Sans SC,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}*{margin:0;padding:0;box-sizing:border-box}:root{--primary: #4caf50;--primary-dark: #388e3c;--primary-light: #a5d6a7;--secondary: #ffc107;--bg: #ffffff;--bg-alt: #f8faf8;--text: #1a1a2e;--text-light: #555;--text-muted: #999;--radius: 16px;--radius-sm: 8px;--shadow: 0 4px 24px rgba(0, 0, 0, .06);--shadow-hover: 0 8px 32px rgba(0, 0, 0, .1);--transition: .3s cubic-bezier(.25, .46, .45, .94)}html{scroll-behavior:smooth}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,Noto Sans SC,sans-serif;color:var(--text);line-height:1.7;-webkit-font-smoothing:antialiased}.app{min-height:100vh;overflow-x:hidden}.section-inner{max-width:1100px;margin:0 auto;padding:0 2rem}.section-header{text-align:center;margin-bottom:3rem}.section-badge{display:inline-block;padding:.35rem 1rem;border-radius:99px;font-size:.85rem;font-weight:600;color:var(--primary-dark);background:#4caf501a;margin-bottom:1rem}.section-header h2{font-size:2.2rem;font-weight:800;color:var(--text);margin-bottom:.75rem}.section-desc{font-size:1.1rem;color:var(--text-light)}.fade-in-section{opacity:0;transform:translateY(24px);transition:opacity .6s var(--transition),transform .6s var(--transition)}.fade-in-section.is-visible{opacity:1;transform:translateY(0)}.nav{display:flex;justify-content:space-between;align-items:center;padding:1.25rem 2rem;max-width:1100px;margin:0 auto}.nav-brand{font-size:1.4rem;font-weight:800;color:var(--primary-dark);display:flex;align-items:center;gap:.4rem}.nav-logo-img{width:32px;height:32px;border-radius:6px;object-fit:contain}.nav-links{display:flex;gap:2rem}.nav-links a{color:var(--text-light);text-decoration:none;font-weight:500;font-size:.95rem;transition:color var(--transition)}.nav-links a:hover{color:var(--primary-dark)}.hero{background:linear-gradient(160deg,#e8f5e9,#fffde7,#e3f2fd);padding-bottom:5rem;position:relative;overflow:hidden}.hero:after{content:"";position:absolute;bottom:0;left:0;right:0;height:80px;background:linear-gradient(to bottom,transparent,var(--bg))}.hero-content{text-align:center;padding:4rem 2rem 2rem;max-width:720px;margin:0 auto;opacity:0;transform:translateY(20px);transition:opacity .8s ease,transform .8s ease}.hero-content.hero-visible{opacity:1;transform:translateY(0)}.hero-badge{display:inline-block;padding:.35rem 1rem;border-radius:99px;font-size:.85rem;font-weight:600;color:var(--primary-dark);background:#4caf501f;margin-bottom:1.5rem}.hero-content h1{font-size:3.2rem;font-weight:900;color:var(--text);line-height:1.2;margin-bottom:1rem}.gradient-text{background:linear-gradient(135deg,var(--primary) 0%,#2196f3 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.hero-subtitle{font-size:1.15rem;color:var(--text-light);margin-bottom:2rem;line-height:1.8}.hero-actions{display:flex;gap:1rem;justify-content:center;margin-bottom:3rem}.btn{display:inline-flex;align-items:center;gap:.5rem;padding:.85rem 2rem;border-radius:var(--radius);font-size:1rem;font-weight:600;text-decoration:none;transition:all var(--transition);cursor:pointer;border:none}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-dark);transform:translateY(-2px);box-shadow:0 6px 20px #4caf5059}.btn-arrow{transition:transform var(--transition)}.btn-primary:hover .btn-arrow{transform:translate(4px)}.hero-stats{display:flex;justify-content:center;align-items:center;gap:2rem;padding:1.5rem 2rem;background:#ffffffb3;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-radius:var(--radius);border:1px solid rgba(76,175,80,.1);max-width:480px;margin:0 auto}.hero-stat{text-align:center}.hero-stat-num{font-size:1.5rem;font-weight:800;color:var(--primary-dark)}.hero-stat-label{font-size:.8rem;color:var(--text-muted);margin-top:.2rem}.hero-stat-divider{width:1px;height:36px;background:#e0e0e0}.features{padding:6rem 0}.features-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1.5rem}.feature-card{background:var(--bg);border:1px solid #eee;border-radius:var(--radius);padding:2rem;transition:all var(--transition)}.feature-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover);border-color:var(--primary-light)}.feature-icon{font-size:2.5rem;margin-bottom:1rem}.feature-card h3{font-size:1.15rem;margin-bottom:.5rem;color:var(--text)}.feature-card p{color:var(--text-light);font-size:.92rem;line-height:1.6}.workflow{padding:6rem 0;background:var(--bg-alt)}.workflow-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:1.5rem}.workflow-step{text-align:center;padding:2rem 1rem;position:relative}.step-number{position:absolute;top:.5rem;left:50%;transform:translate(-50%);width:28px;height:28px;background:var(--primary);color:#fff;border-radius:50%;font-size:.8rem;font-weight:700;display:flex;align-items:center;justify-content:center}.step-icon{font-size:2.5rem;margin:1.5rem 0 1rem}.workflow-step h3{font-size:1.05rem;margin-bottom:.5rem}.workflow-step p{font-size:.9rem;color:var(--text-light)}.roles{padding:6rem 0}.roles-grid{display:grid;grid-template-columns:1fr 1fr;gap:2rem}.role-card{border-radius:var(--radius);padding:2.5rem;transition:transform var(--transition)}.role-card:hover{transform:translateY(-4px)}.role-student{background:linear-gradient(135deg,#e8f5e9,#c8e6c9);border:1px solid #a5d6a7}.role-parent{background:linear-gradient(135deg,#e3f2fd,#bbdefb);border:1px solid #90caf9}.role-icon{font-size:2.5rem;margin-bottom:1rem}.role-card h3{font-size:1.3rem;margin-bottom:1rem}.role-card ul{list-style:none;padding:0}.role-card li{font-size:.95rem;color:var(--text-light);position:relative;padding:.4rem 0 .4rem 1.4rem}.role-card li:before{content:"✓";position:absolute;left:0;color:var(--primary);font-weight:700}.faq{padding:6rem 0;background:var(--bg-alt)}.faq-list{max-width:720px;margin:0 auto}.faq-item{border-bottom:1px solid #e0e0e0}.faq-question{width:100%;display:flex;justify-content:space-between;align-items:center;padding:1.2rem 0;background:none;border:none;font-size:1.05rem;font-weight:600;color:var(--text);cursor:pointer;text-align:left;font-family:inherit}.faq-toggle{font-size:1.5rem;color:var(--primary);transition:transform var(--transition)}.faq-open .faq-toggle{transform:rotate(180deg)}.faq-answer{max-height:0;overflow:hidden;transition:max-height .4s ease,padding .4s ease}.faq-open .faq-answer{max-height:200px;padding-bottom:1.2rem}.faq-answer p{color:var(--text-light);font-size:.95rem;line-height:1.7}.footer{padding:2.5rem 0;text-align:center;border-top:1px solid #eee}.footer-brand{font-size:1.2rem;font-weight:700;color:var(--primary-dark);margin-bottom:.5rem;display:flex;align-items:center;justify-content:center;gap:.4rem}.footer-logo-img{width:24px;height:24px;border-radius:4px;object-fit:contain}.footer p{font-size:.85rem;color:var(--text-muted)}.footer-beian{margin-top:.5rem;display:flex;align-items:center;justify-content:center;gap:.5rem;flex-wrap:wrap}.footer-beian a{color:var(--text-muted);text-decoration:none;font-size:.8rem;transition:color var(--transition)}.footer-beian a:hover{color:var(--primary)}.footer-beian-divider{color:#ddd;font-size:.8rem}.footer-police-link{display:inline-flex;align-items:center;gap:4px}.footer-police-icon{width:16px;height:16px;vertical-align:middle}.download{padding:5rem 0;text-align:center;background:linear-gradient(135deg,#1b5e20,#2e7d32,#388e3c);color:#fff}.download .section-badge{color:#fff;background:#ffffff2e}.download .section-header h2{color:#fff}.download .section-desc{color:#fffc}.download-platforms{display:flex;gap:2rem;justify-content:center;margin-top:2rem}.download-card{background:#ffffff1f;border:1px solid rgba(255,255,255,.2);border-radius:var(--radius);padding:2rem 2.5rem;min-width:180px;transition:all var(--transition);position:relative}.download-card:hover{background:#fff3;transform:translateY(-4px)}.download-card-icon{font-size:2.5rem;margin-bottom:.5rem}.download-card-label{font-size:1.2rem;font-weight:700;margin-bottom:.75rem}.download-hint{font-size:.85rem;opacity:.7;cursor:pointer;padding:.3rem .8rem;border:1px solid rgba(255,255,255,.3);border-radius:99px;display:inline-block;transition:all var(--transition)}.download-qr-trigger:hover .download-hint{opacity:1;border-color:#ffffffb3}.download-qr-popup{position:absolute;bottom:calc(100% + 12px);left:50%;transform:translate(-50%) scale(.9);background:#fff;border-radius:var(--radius);padding:1.25rem;box-shadow:0 8px 32px #00000040;opacity:0;pointer-events:none;transition:opacity .25s ease,transform .25s ease;z-index:100}.download-qr-popup:after{content:"";position:absolute;top:100%;left:50%;transform:translate(-50%);border:8px solid transparent;border-top-color:#fff}.download-qr-trigger:hover .download-qr-popup{opacity:1;pointer-events:auto;transform:translate(-50%) scale(1)}.download-qr-text{color:var(--text);font-size:.8rem;margin-top:.5rem;font-weight:500}.download-coming-soon{font-size:.85rem;opacity:.6;padding:.3rem .8rem;border:1px dashed rgba(255,255,255,.3);border-radius:99px;display:inline-block}.workflow-steps-3{grid-template-columns:repeat(3,1fr)}@media (max-width: 900px){.features-grid,.workflow-steps,.workflow-steps-3{grid-template-columns:repeat(2,1fr)}}@media (max-width: 640px){.hero-content h1{font-size:2.2rem}.hero-subtitle{font-size:1rem}.hero-stats{flex-direction:column;gap:1rem}.hero-stat-divider{width:60px;height:1px}.section-header h2{font-size:1.7rem}.features-grid,.workflow-steps,.workflow-steps-3,.roles-grid{grid-template-columns:1fr}.nav-links{gap:1rem;font-size:.9rem}.download-platforms{flex-direction:column;align-items:center;gap:1.5rem}.download-card{min-width:200px}.download-qr-popup{position:fixed;bottom:auto;top:50%;left:50%;transform:translate(-50%,-50%) scale(.9)}.download-qr-trigger:hover .download-qr-popup{transform:translate(-50%,-50%) scale(1)}.download-qr-popup:after{display:none}.footer-beian{flex-direction:column;gap:.3rem}.footer-beian-divider{display:none}}