:root{--primary-color: #10b981;--secondary-color: #059669;--accent-color: #047857;--background-color: #0f1720;--card-background: #1a2634;--text-color: #e2e8f0;--text-muted: #94a3b8;--gray-light: #2d3c4f;--gray-dark: #1a2634}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Noto Sans KR,sans-serif;line-height:1.6;color:var(--text-color);background-color:var(--background-color)}header{background-color:#0f1720f2;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);box-shadow:0 1px 3px #0000004d;position:fixed;width:100%;top:0;z-index:1000;border-bottom:1px solid var(--gray-light)}nav{max-width:1200px;margin:0 auto;padding:1rem;display:flex;justify-content:space-between;align-items:center}.logo{font-size:1.5rem;font-weight:700;color:var(--primary-color)}.nav-links{display:flex;gap:2rem;list-style:none}.nav-links button.nav-link{text-decoration:none;color:var(--text-color);font-weight:500;padding:.5rem 1rem;border-radius:8px;transition:all .3s ease;background:none;border:none;cursor:pointer;font-size:inherit}.nav-links button.nav-link:hover{background-color:var(--gray-light)}.signup-btn{background:linear-gradient(135deg,var(--primary-color),var(--secondary-color));color:#fff;padding:.75rem 1.5rem;border-radius:99px;border:none;cursor:pointer;font-size:inherit;font-family:inherit;box-shadow:0 4px 6px -1px #2563eb33;transition:transform .3s ease}.signup-btn:hover{transform:translateY(-2px);background:linear-gradient(135deg,var(--secondary-color),var(--primary-color))}.hero{padding:8rem 2rem 4rem;background:linear-gradient(135deg,var(--background-color),var(--gray-dark));color:#fff;text-align:center;position:relative;overflow:hidden}.hero:before{content:"";position:absolute;top:0;left:0;right:0;bottom:0;background:url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1440 320"><path fill="%23ffffff20" fill-opacity="1" d="M0,96L48,112C96,128,192,160,288,186.7C384,213,480,235,576,213.3C672,192,768,128,864,128C960,128,1056,192,1152,208C1248,224,1344,192,1392,176L1440,160L1440,320L1392,320C1344,320,1248,320,1152,320C1056,320,960,320,864,320C768,320,672,320,576,320C480,320,384,320,288,320C192,320,96,320,48,320L0,320Z"></path></svg>');background-repeat:no-repeat;background-position:bottom;opacity:.05}.hero-content{max-width:800px;margin:0 auto;position:relative;z-index:1}.hero h1{font-size:3.5rem;font-weight:800;line-height:1.1;margin-bottom:1.5rem;text-shadow:0 2px 4px rgba(0,0,0,.1)}.cta-buttons{margin-top:2rem;display:flex;gap:1rem;justify-content:center}.download-btn,.demo-btn{border:none;cursor:pointer;font-size:inherit;font-family:inherit;padding:1rem 2rem;border-radius:99px;font-weight:600;transition:all .3s ease}.download-btn{background:#fff;color:var(--primary-color);box-shadow:0 4px 6px -1px #0000001a}.demo-btn{background:#10b9811a;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border:2px solid rgba(16,185,129,.2);color:var(--primary-color)}.demo-btn:hover{transform:translateY(-2px);background:#10b98133;border-color:#10b9814d}.download-btn:hover,.demo-btn:hover{transform:translateY(-2px)}section h2{text-align:center;font-size:2.5rem;font-weight:700;margin-bottom:3rem;background:linear-gradient(135deg,var(--primary-color),var(--secondary-color));-webkit-background-clip:text;-webkit-text-fill-color:transparent;position:relative;padding-bottom:1rem}section h2:after{content:"";position:absolute;bottom:0;left:50%;transform:translate(-50%);width:50px;height:3px;background:linear-gradient(135deg,var(--primary-color),var(--secondary-color));border-radius:3px}.features,.pricing{padding:6rem 2rem;background-color:var(--background-color)}.feature-grid,.pricing-cards{margin-top:4rem}.features{background-color:var(--background-color)}.feature-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:2rem;max-width:1200px;margin:2rem auto 0}.feature-card{background:var(--card-background);padding:2.5rem;border-radius:20px;box-shadow:0 10px 25px -5px #0000000d;text-align:center;transition:transform .3s ease,box-shadow .3s ease;border:1px solid var(--gray-light);color:var(--text-color)}.feature-card:hover{transform:translateY(-5px);box-shadow:0 20px 35px -10px #0000001a}.feature-icon{font-size:3rem;margin-bottom:1.5rem;background:linear-gradient(135deg,var(--primary-color),var(--secondary-color));-webkit-background-clip:text;-webkit-text-fill-color:transparent}.pricing{background-color:var(--background-color)}.pricing-cards{display:flex;gap:2rem;justify-content:center;max-width:1200px;margin:2rem auto 0;flex-wrap:wrap}.pricing-card{background:var(--card-background);padding:3rem 2rem;border-radius:20px;box-shadow:0 10px 25px -5px #0000000d;transition:transform .3s ease;flex:1;min-width:300px;max-width:400px;border:1px solid var(--gray-light);color:var(--text-color)}.pricing-card.featured{transform:scale(1.05);background:linear-gradient(135deg,var(--primary-color),var(--secondary-color));color:#fff}.pricing-card.featured .price,.pricing-card.featured h3{color:#fff}.pricing-card ul{margin:2rem 0;list-style:none}.pricing-card ul li{padding:.5rem 0;display:flex;align-items:center;gap:.5rem}.pricing-card ul li:before{content:"✓";color:var(--accent-color);font-weight:700}.pricing-card.featured ul li:before{color:#fff}.price{font-size:2rem;font-weight:700;margin:1rem 0}.price span{font-size:1rem;color:var(--text-muted)}.modal{display:none;position:fixed;top:0;left:0;width:100%;height:100%;background-color:#00000080;z-index:1001}.modal-content{background:var(--card-background);padding:3rem;border-radius:20px;box-shadow:0 25px 50px -12px #00000040;max-width:500px;margin:15% auto;position:relative;color:var(--text-color)}.close{position:absolute;right:1rem;top:1rem;font-size:1.5rem;cursor:pointer}#signup-form{display:flex;flex-direction:column;gap:1rem;margin-top:1rem}#signup-form input{padding:1rem;border:2px solid var(--gray-light);border-radius:12px;transition:border-color .3s ease;background:var(--background-color);color:var(--text-color)}#signup-form input:focus{border-color:var(--primary-color);outline:none}#signup-form input::placeholder{color:var(--text-muted)}#signup-form button{background:linear-gradient(135deg,var(--primary-color),var(--secondary-color));padding:1rem;border-radius:12px;font-weight:600;transition:transform .3s ease}#signup-form button:hover{transform:translateY(-2px)}footer{background-color:var(--gray-dark);color:#fff;padding:3rem 2rem 1rem;border-top:1px solid var(--gray-light)}.footer-content{max-width:1200px;margin:0 auto;display:flex;justify-content:space-around;flex-wrap:wrap}.footer-section{margin-bottom:2rem}.footer-section h4{margin-bottom:1rem}.footer-section ul{list-style:none}.footer-section button.footer-link{color:#ddd;text-decoration:none;background:none;border:none;padding:0;cursor:pointer;font-size:inherit}.footer-section button.footer-link:hover{color:var(--primary-color)}.footer-bottom{text-align:center;margin-top:2rem;padding-top:1rem;border-top:1px solid rgba(255,255,255,.1)}@media (max-width: 768px){.nav-links{display:none}.hero h1{font-size:2rem}.cta-buttons{flex-direction:column}.pricing-card{min-width:100%}}.oauth-container{margin-top:2rem}.google-btn{display:flex;align-items:center;justify-content:center;gap:1rem;width:100%;padding:.875rem 1rem;border:1px solid var(--gray-light);border-radius:8px;background:var(--card-background);color:var(--text-color);font-size:1rem;font-weight:500;cursor:pointer;transition:all .2s ease;min-height:44px}.google-btn:hover{background:var(--gray-light);transform:translateY(-1px);box-shadow:0 2px 4px #0000001a}.google-btn img{width:18px;height:18px}.spinner{width:20px;height:20px;border:2px solid var(--text-color);border-top:2px solid transparent;border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.google-btn.loading{opacity:.7;cursor:not-allowed}.account-menu{position:relative}.account-btn{background:var(--card-background);color:var(--text-color);padding:.75rem 1.5rem;border-radius:99px;border:1px solid var(--gray-light);cursor:pointer;font-size:inherit;font-family:inherit;transition:all .3s ease}.account-btn:hover{background:var(--gray-light)}.dropdown-menu{position:absolute;top:100%;right:0;margin-top:.5rem;background:var(--card-background);border:1px solid var(--gray-light);border-radius:12px;padding:.5rem;min-width:200px;box-shadow:0 4px 6px -1px #0000001a;z-index:1000}.dropdown-item{display:block;width:100%;padding:.75rem 1rem;text-align:left;background:none;border:none;border-radius:8px;color:var(--text-color);cursor:pointer;transition:all .2s ease}.dropdown-item:hover{background:var(--gray-light)}.dropdown-item.logout{color:#ef4444;border-top:1px solid var(--gray-light);margin-top:.5rem;padding-top:.75rem}.dropdown-item.logout:hover{background:#ef44441a}.not-found{min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:2rem;background:var(--background-color)}.not-found h1{font-size:8rem;font-weight:700;margin:0;background:linear-gradient(135deg,var(--primary-color),var(--secondary-color));-webkit-background-clip:text;-webkit-text-fill-color:transparent}.not-found h2{font-size:2rem;margin:1rem 0}.not-found p{color:var(--text-muted);margin-bottom:2rem}.not-found .home-link{background:linear-gradient(135deg,var(--primary-color),var(--secondary-color));color:#fff;padding:.75rem 1.5rem;border-radius:99px;text-decoration:none;font-weight:500;transition:transform .3s ease}.not-found .home-link:hover{transform:translateY(-2px)}.auth-page{min-height:100vh;display:flex;align-items:center;justify-content:center;background:var(--background-color)}.auth-content{text-align:center;padding:2rem}.auth-content .spinner{margin:0 auto 1rem;width:40px;height:40px}.auth-content p{color:var(--text-muted);font-size:1.1rem}.manual-redirect{margin-top:2rem;text-align:center}.manual-redirect p{color:var(--text-muted);margin-bottom:1rem}.redirect-btn{background:linear-gradient(135deg,var(--primary-color),var(--secondary-color));color:#fff;padding:.75rem 1.5rem;border-radius:99px;border:none;cursor:pointer;font-weight:500;transition:transform .3s ease}.redirect-btn:hover{transform:translateY(-2px)}