*{margin:0;padding:0;box-sizing:border-box}:root{--primary: #4361ee;--secondary: #3f37c9;--accent: #4895ef;--success: #4cc9f0;--light: #f8f9fa;--dark: #212529;--word: #2b579a;--excel: #217346;--ppt: #d24726;--upload: #6c757d;--privacy: #4CAF50;--security: #FF9800;--shadow: 0 4px 20px rgba(0, 0, 0, .08);--transition: all .3s ease;--bg-primary: #f5f7fa;--bg-secondary: #ffffff;--text-primary: #212529;--text-secondary: #495057;--card-bg: #ffffff;--footer-bg: #212529;--privacy-bg: #e8f5e9;--border-color: rgba(0, 0, 0, .1)}[data-theme=dark]{--bg-primary: #121212;--bg-secondary: #1e1e1e;--text-primary: #e0e0e0;--text-secondary: #b0b0b0;--card-bg: #2d2d2d;--footer-bg: #1a1a1a;--privacy-bg: #1b3a1f;--border-color: rgba(255, 255, 255, .1);--word: #4a76c6;--excel: #2e9a5f;--ppt: #e06c4d}body{font-family:Roboto,sans-serif;background:linear-gradient(135deg,var(--bg-primary) 0%,var(--bg-primary) 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#0000001a;padding:10px 0;min-width:150px;display:none;z-index:200}.language-dropdown.show{display:block}.language-option{padding:10px 20px;display:flex;align-items:center;gap:10px;cursor:pointer;transition:all .2s ease}.language-option:hover{background:#4361ee1a}.theme-toggle{background:transparent;border:none;width:40px;height:40px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:var(--text-primary);cursor:pointer;transition:all .3s ease}.theme-toggle:hover{background:#4361ee1a}.auth-buttons{display:flex;gap:15px}.btn{padding:10px 20px;border-radius:8px;font-weight:500;font-size:15px;cursor:pointer;transition:var(--transition);text-decoration:none;display:inline-block;text-align:center;border:none;font-family:Poppins,sans-serif}.btn-outline{background:transparent;border:2px solid var(--primary);color:var(--primary)}.btn-outline:hover{background:var(--primary);color:#fff}.btn-primary{background:var(--primary);color:#fff;border:2px solid var(--primary)}.btn-primary:hover{background:var(--secondary);transform:translateY(-2px)}.hero{padding:80px 0 20px;text-align:center;max-width:960px;margin:0 auto}.hero h1{font-family:Poppins,sans-serif;font-size:3.5rem;font-weight:700;line-height:1.2;margin-bottom:20px;color:var(--text-primary);background:linear-gradient(90deg,var(--primary),var(--accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent}.hero p{font-size:1.25rem;color:var(--text-secondary);margin-bottom:40px;max-width:800px;margin-left:auto;margin-right:auto}.highlight{background:linear-gradient(120deg,#4361ee26,#4361ee00);padding:2px 8px;border-radius:4px;font-weight:500}.privacy-guarantee{background:#4caf501a;border:2px dashed rgba(76,175,80,.3);border-radius:12px;padding:15px;margin-top:20px;display:flex;align-items:center;justify-content:center;gap:10px;font-weight:500;color:var(--text-primary)}.features{padding:40px 0 80px}.section-title{text-align:center;font-family:Poppins,sans-serif;font-size:1.8rem;font-weight:600;margin-bottom:40px;color:var(--text-primary);position:relative}.section-title:after{content:"";position:absolute;bottom:-15px;left:50%;transform:translate(-50%);width:60px;height:4px;background:var(--accent);border-radius:2px}.cards-container{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;max-width:1300px;margin:0 auto}.card{background:var(--card-bg);border-radius:16px;overflow:hidden;box-shadow:var(--shadow);transition:var(--transition);text-align:center;padding:30px 20px;position:relative;z-index:1;border:1px solid var(--border-color)}.card:hover{transform:translateY(-10px);box-shadow:0 12px 30px #00000026}.card-icon{width:70px;height:70px;border-radius:50%;display:flex;align-items:center;justify-content:center;margin:0 auto 20px;font-size:28px;color:#fff}.card-icon.upload{background:linear-gradient(135deg,var(--upload),#5a6268)}.card-icon.word{background:linear-gradient(135deg,var(--word),#2b579a)}.card-icon.excel{background:linear-gradient(135deg,var(--excel),#1d6f42)}.card-icon.ppt{background:linear-gradient(135deg,var(--ppt),#c1442e)}.card h3{font-family:Poppins,sans-serif;font-size:1.5rem;margin-bottom:12px;color:var(--text-primary)}.card p{color:var(--text-secondary);margin-bottom:20px;font-size:.95rem}.card-btn{padding:10px;border-radius:8px;font-weight:500;font-size:15px;cursor:pointer;transition:var(--transition);text-decoration:none;display:inline-block;border:none;font-family:Poppins,sans-serif;width:100%;max-width:180px}.card-btn.upload{background:var(--upload);color:#fff}.card-btn.upload:hover{background:#5a6268}.card-btn.word{background:var(--word);color:#fff}.card-btn.word:hover{background:#214e8a}.card-btn.excel{background:var(--excel);color:#fff}.card-btn.excel:hover{background:#1b6239}.card-btn.ppt{background:var(--ppt);color:#fff}.card-btn.ppt:hover{background:#b53e1d}.benefits{background:var(--bg-secondary);padding:80px 0;border-radius:30px 30px 0 0;box-shadow:0 -10px 30px #0000000d;transition:background .3s ease}.benefits-container{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:40px;max-width:1100px;margin:0 auto}.benefit{display:flex;gap:20px;background:#4361ee08;border-radius:16px;padding:25px;transition:var(--transition);border:1px solid var(--border-color)}.benefit:hover{transform:translateY(-5px);box-shadow:0 5px 15px #0000000d}.benefit-icon{width:60px;height:60px;background:#4361ee1a;border-radius:12px;display:flex;align-items:center;justify-content:center;color:var(--primary);font-size:24px;flex-shrink:0}.benefit-content h3{font-family:Poppins,sans-serif;font-size:1.4rem;margin-bottom:10px;color:var(--text-primary)}.benefit-content p{color:var(--text-secondary)}.privacy-section{background:linear-gradient(135deg,var(--privacy-bg) 0%,#c8e6c9 100%);padding:80px 0 140px;text-align:center;transition:background .3s ease}.privacy-content{max-width:960px;margin:0 auto}.privacy-icon{font-size:64px;color:var(--privacy);margin-bottom:20px}.privacy-content h2{font-family:Poppins,sans-serif;font-size:2.5rem;margin-bottom:20px;color:var(--privacy)}.privacy-content p{font-size:1.1rem;color:#388e3c;margin-bottom:30px;line-height:1.8}[data-theme=dark] .privacy-content p{color:#8bc34a}.privacy-features{display:flex;flex-wrap:wrap;justify-content:center;gap:20px;margin-top:40px}.privacy-feature{background:var(--bg-secondary);border-radius:12px;padding:20px;width:220px;box-shadow:0 4px 12px #0000000d;border:1px solid var(--border-color)}.privacy-feature i{font-size:36px;color:var(--privacy);margin-bottom:15px}.privacy-feature h4{font-family:Poppins,sans-serif;margin-bottom:10px;color:var(--text-primary)}.privacy-feature p{color:var(--text-secondary);font-size:.9rem}footer{background:var(--footer-bg);color:#ffffffb3;padding:60px 0 30px;transition:background .3s ease}.footer-content{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:40px;margin-bottom:40px}.footer-col h4{color:#fff;font-family:Poppins,sans-serif;font-size:1.3rem;margin-bottom:25px;position:relative}.footer-col h4:after{content:"";position:absolute;bottom:-10px;left:0;width:40px;height:3px;background:var(--accent)}.footer-links{list-style:none}.footer-links li{margin-bottom:12px}.footer-links a{color:#ffffffb3;text-decoration:none;transition:var(--transition);display:inline-block}.footer-links a:hover{color:#fff;transform:translate(5px)}.copyright{text-align:center;padding-top:30px;border-top:1px solid rgba(255,255,255,.1);font-size:.9rem}@media (max-width: 1200px){.cards-container{gap:15px}.card h3{font-size:1.4rem}}@media (max-width: 992px){.cards-container{grid-template-columns:repeat(2,1fr);gap:25px}.card{padding:25px 15px}.hero h1{font-size:2.8rem}.utility-buttons{gap:10px}}@media (max-width: 768px){.navbar{flex-direction:column;gap:20px}.hero h1{font-size:2.5rem}.hero p{font-size:1.1rem}.section-title{font-size:1.8rem}.auth-buttons{width:100%;justify-content:center}.utility-buttons{margin-top:10px}}@media (max-width: 576px){.cards-container{grid-template-columns:1fr;max-width:400px}.hero{padding:50px 0 30px}.hero h1{font-size:2rem}.card{padding:30px 20px}.privacy-features{flex-direction:column;align-items:center}.language-selector{position:static}.language-dropdown{left:0;right:auto}}