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p{color:var(--text-secondary);line-height:1.8}.faq-contact{text-align:center;background:var(--card-bg);border-radius:16px;padding:2.5rem;max-width:600px;margin:0 auto;box-shadow:0 4px 20px #00000014}.faq-contact h2{font-size:1.5rem;color:var(--text-color);margin-bottom:.5rem}.faq-contact p{color:var(--text-secondary);margin-bottom:1.5rem}.contact-btn{display:inline-block;background:var(--primary-color);color:#fff;padding:.75rem 2rem;border-radius:8px;text-decoration:none;font-weight:600;transition:background-color .3s ease,transform .3s ease}.contact-btn:hover{background:var(--primary-hover);transform:translateY(-2px)}@media(max-width:768px){.faq-header h1{font-size:1.8rem}.faq-question{padding:1rem;font-size:.95rem}.faq-item.open .faq-answer{padding:0 1rem 1rem}}.guide-page{padding:2rem 1rem;min-height:calc(100vh - 70px)}.guide-header{text-align:center;margin-bottom:3rem}.guide-header h1{font-size:2.5rem;color:var(--primary-color);margin-bottom:.5rem;font-weight:700}.guide-header p{color:var(--text-secondary);font-size:1.1rem}.guide-section{max-width:900px;margin:0 auto 2.5rem;background:var(--card-bg);border-radius:16px;padding:2rem;box-shadow:0 4px 20px #00000014}.section-header{display:flex;align-items:center;gap:1rem;margin-bottom:1.5rem;padding-bottom:1rem;border-bottom:2px solid var(--primary-color)}.section-icon{font-size:2rem}.section-header h2{font-size:1.6rem;color:var(--text-color);margin:0}.guide-content{display:flex;flex-direction:column;gap:1.5rem}.guide-article{padding:1rem;border-radius:8px;background:var(--bg-color);border-left:4px solid var(--primary-color)}.guide-article h3{font-size:1.15rem;color:var(--text-color);margin-bottom:.5rem}.guide-article p{color:var(--text-secondary);line-height:1.7}.formula-box{background:linear-gradient(135deg,rgba(var(--primary-rgb),.1),rgba(var(--primary-rgb),.05));border-radius:12px;padding:1.5rem;margin-top:1rem}.formula-box h4{color:var(--primary-color);margin-bottom:1rem;font-size:1.1rem}.formula-box ul{list-style:none;padding:0;display:grid;gap:.75rem}.formula-box li{color:var(--text-secondary);padding:.5rem;background:var(--card-bg);border-radius:6px;font-family:Courier New,monospace}.formula-box li strong{color:var(--text-color)}.algorithm-box{background:linear-gradient(135deg,rgba(var(--primary-rgb),.1),rgba(var(--primary-rgb),.05));border-radius:12px;padding:1.5rem;margin-top:1rem}.algorithm-box h4{color:var(--primary-color);margin-bottom:1rem;font-size:1.1rem}.algorithm-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:1rem}.algorithm-item{display:flex;justify-content:space-between;align-items:center;padding:.75rem 1rem;background:var(--card-bg);border-radius:8px;border:1px solid var(--border-color)}.algo-name{font-weight:600;color:var(--text-color)}.algo-complexity{font-family:Courier New,monospace;color:var(--primary-color);font-size:.9rem}.tips-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:1.5rem}.tip-card{background:var(--bg-color);border-radius:12px;padding:1.5rem;text-align:center;border:1px solid var(--border-color);transition:transform .3s ease,box-shadow .3s ease}.tip-card:hover{transform:translateY(-4px);box-shadow:0 8px 24px #0000001a}.tip-number{width:40px;height:40px;background:var(--primary-color);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1.2rem;font-weight:700;margin:0 auto 1rem}.tip-card h4{color:var(--text-color);margin-bottom:.5rem;font-size:1.05rem}.tip-card p{color:var(--text-secondary);font-size:.95rem;line-height:1.6}@media(max-width:768px){.guide-header h1{font-size:1.8rem}.guide-section{padding:1.5rem}.section-header h2{font-size:1.3rem}.algorithm-grid{grid-template-columns:1fr}}.app{min-height:100vh;display:flex;flex-direction:column}.main-content{padding-top:70px;min-height:calc(100vh - 70px);position:relative;z-index:1;flex:1}:root{--primary-gradient: linear-gradient(135deg, #10b981 0%, #059669 100%);--accent-gradient: linear-gradient(135deg, #34d399 0%, #10b981 100%);--success-gradient: linear-gradient(135deg, #6ee7b7 0%, #34d399 100%);--dark-bg: #0a1f1a;--dark-card: rgba(255, 255, 255, .05);--dark-border: rgba(16, 185, 129, .2);--text-primary: #ffffff;--text-secondary: rgba(255, 255, 255, .8);--text-muted: rgba(255, 255, 255, .6);--spacing-xs: .5rem;--spacing-sm: 1rem;--spacing-md: 1.5rem;--spacing-lg: 2rem;--spacing-xl: 3rem;--radius-sm: 8px;--radius-md: 16px;--radius-lg: 24px;--radius-full: 9999px;--shadow-sm: 0 2px 8px rgba(0, 0, 0, .1);--shadow-md: 0 4px 16px rgba(0, 0, 0, .2);--shadow-lg: 0 8px 32px rgba(0, 0, 0, .3);--shadow-glow: 0 0 20px rgba(16, 185, 129, .3);--font-primary: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;--font-display: "Space Grotesk", -apple-system, BlinkMacSystemFont, sans-serif}:root[data-theme=light]{--dark-bg: #f0fdf4;--dark-card: rgba(255, 255, 255, .9);--dark-border: rgba(16, 185, 129, .3);--text-primary: #064e3b;--text-secondary: #065f46;--text-muted: #047857;--shadow-sm: 0 2px 8px rgba(16, 185, 129, .08);--shadow-md: 0 4px 16px rgba(16, 185, 129, .12);--shadow-lg: 0 8px 32px rgba(16, 185, 129, .15);--shadow-glow: 0 0 20px rgba(16, 185, 129, .15)}:root[data-theme=light] body:before{background:radial-gradient(circle at 20% 50%,rgba(16,185,129,.08) 0%,transparent 50%),radial-gradient(circle at 80% 80%,rgba(5,150,105,.06) 0%,transparent 50%),radial-gradient(circle at 40% 20%,rgba(52,211,153,.05) 0%,transparent 40%)}[data-theme=light] .control-select{background-color:#fffc;color:var(--text-primary);background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23064e3b' d='M6 9L1 4h10z'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 1rem center}[data-theme=light] .control-select:hover{background-color:#fffffff2}[data-theme=light] .problem-content code{background:#10b9811f;color:#047857}[data-theme=light] .problem-content pre{background:#10b9810d;border:1px solid rgba(16,185,129,.2)}[data-theme=light] header,[data-theme=light] .header{background:#f0fdf4e6}*{margin:0;padding:0;box-sizing:border-box}html{height:100%;overflow-x:hidden;overflow-y:scroll}body{font-family:var(--font-primary);background:var(--dark-bg);color:var(--text-primary);line-height:1.6;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;min-height:100%}body:before{content:"";position:fixed;top:0;left:0;width:100%;height:100%;background:radial-gradient(circle at 20% 50%,rgba(16,185,129,.15) 0%,transparent 50%),radial-gradient(circle at 80% 80%,rgba(5,150,105,.1) 0%,transparent 50%),radial-gradient(circle at 40% 20%,rgba(52,211,153,.08) 0%,transparent 40%);pointer-events:none;z-index:0}#root{position:relative;z-index:1;min-height:100%}.container{max-width:900px;margin:0 auto;padding:var(--spacing-lg) var(--spacing-md)}.page-header{text-align:center;margin-bottom:var(--spacing-xl);animation:fadeInDown .6s ease-out}.page-title{font-family:var(--font-display);font-size:clamp(2rem,5vw,3.5rem);font-weight:700;background:var(--primary-gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:var(--spacing-sm);letter-spacing:-.02em}.title-icon{font-size:1.2em;display:inline-block;animation:bounce 2s infinite}.page-subtitle{font-size:1.125rem;color:var(--text-secondary);font-weight:400}.glass-card{background:var(--dark-card);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border:1px solid var(--dark-border);border-radius:var(--radius-lg);padding:var(--spacing-lg);box-shadow:var(--shadow-md);transition:all .3s cubic-bezier(.4,0,.2,1)}.glass-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg),var(--shadow-glow);border-color:#10b98166}.controls-card{margin-bottom:var(--spacing-lg);display:flex;flex-direction:column;gap:var(--spacing-md)}.control-group{display:flex;flex-direction:column;gap:var(--spacing-xs)}.control-label{font-size:.875rem;font-weight:600;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.05em}.control-select{width:100%;padding:.875rem 3rem .875rem 1.125rem;background:#ffffff0d;border:1px solid var(--dark-border);border-radius:var(--radius-md);color:var(--text-primary);font-size:1rem;font-family:var(--font-primary);cursor:pointer;transition:all .3s ease;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23ffffff' d='M6 9L1 4h10z'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 1rem center}.control-select:hover{background:#ffffff14;border-color:#10b98180}.control-select:focus{outline:none;border-color:#10b981;box-shadow:0 0 0 3px #10b98126}.btn{padding:1rem 2rem;border:none;border-radius:var(--radius-full);font-size:1rem;font-weight:600;font-family:var(--font-primary);cursor:pointer;transition:all .3s cubic-bezier(.4,0,.2,1);position:relative;overflow:hidden;text-transform:none;letter-spacing:.02em}.btn:before{content:"";position:absolute;top:50%;left:50%;width:0;height:0;border-radius:50%;background:#ffffff1a;transform:translate(-50%,-50%);transition:width .6s,height .6s}.btn:hover:before{width:300px;height:300px}.btn-primary{background:var(--primary-gradient);color:#fff;box-shadow:0 4px 15px #10b98166}.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 25px #10b98199}.btn-primary:active{transform:translateY(0)}.btn-primary:disabled{opacity:.6;cursor:not-allowed;transform:none}.btn-large{width:100%;padding:1.25rem 2rem;font-size:1.125rem}.generate-btn{position:relative;z-index:1}.problem-card{margin-top:var(--spacing-lg);animation:fadeInUp .5s ease-out}.problem-content{color:var(--text-primary);line-height:1.8;font-size:1.0625rem}.problem-content h1,.problem-content h2,.problem-content h3{font-family:var(--font-display);margin-top:var(--spacing-lg);margin-bottom:var(--spacing-sm);color:var(--text-primary)}.problem-content h1{font-size:2rem}.problem-content h2{font-size:1.5rem}.problem-content h3{font-size:1.25rem}.problem-content p{margin-bottom:var(--spacing-sm)}.problem-content ul,.problem-content ol{margin-left:var(--spacing-md);margin-bottom:var(--spacing-sm)}.problem-content code{background:#10b98126;padding:.2em .4em;border-radius:4px;font-family:Monaco,Menlo,Consolas,monospace;font-size:.9em;color:#a7f3d0}.problem-content pre{background:#0000004d;border-radius:var(--radius-md);padding:var(--spacing-md);overflow-x:auto;margin:var(--spacing-md) 0;border:1px solid var(--dark-border)}.problem-content pre code{background:none;padding:0;border-radius:0;color:inherit}.error-card{background:#f5576c1a;border:1px solid rgba(245,87,108,.3);margin-top:var(--spacing-md);animation:shake .5s ease-in-out}.error-card p{color:#ff6b88;margin:0;font-weight:500}header{background:#0a0e27cc;backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border-bottom:1px solid var(--dark-border);position:sticky;top:0;z-index:100;animation:slideDown .5s ease-out}.header-container{max-width:1200px;margin:0 auto;padding:var(--spacing-md);display:flex;justify-content:space-between;align-items:center}.logo{font-family:var(--font-display);font-size:1.5rem;font-weight:700;background:var(--primary-gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;text-decoration:none;transition:transform .3s ease}.logo:hover{transform:scale(1.05)}nav{display:flex;gap:var(--spacing-sm)}.nav-link{padding:.625rem 1.25rem;border-radius:var(--radius-full);text-decoration:none;color:var(--text-secondary);font-weight:500;transition:all .3s ease;position:relative}.nav-link:after{content:"";position:absolute;bottom:0;left:50%;width:0;height:2px;background:var(--primary-gradient);transform:translate(-50%);transition:width .3s ease}.nav-link:hover{color:var(--text-primary)}.nav-link:hover:after{width:60%}.nav-link.active{background:#10b98126;color:var(--text-primary)}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes fadeInDown{0%{opacity:0;transform:translateY(-20px)}to{opacity:1;transform:translateY(0)}}@keyframes fadeInUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@keyframes slideDown{0%{transform:translateY(-100%)}to{transform:translateY(0)}}@keyframes shake{0%,to{transform:translate(0)}25%{transform:translate(-10px)}75%{transform:translate(10px)}}@keyframes bounce{0%,to{transform:translateY(0)}50%{transform:translateY(-10px)}}.fade-in{animation:fadeIn .5s ease-out}@media(max-width:768px){.container{padding:var(--spacing-md) var(--spacing-sm)}.page-title{font-size:2rem}.page-subtitle{font-size:1rem}.glass-card{padding:var(--spacing-md)}nav{flex-direction:column;gap:var(--spacing-xs)}.nav-link{text-align:center}}.loading{display:inline-block;width:20px;height:20px;border:3px solid rgba(255,255,255,.3);border-radius:50%;border-top-color:#fff;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}