@import"https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;500;600;700;800&display=swap";:root{--font-heading: "Outfit", "Inter", system-ui, -apple-system, sans-serif;--font-body: "Inter", system-ui, -apple-system, sans-serif;--bg-dark: #0e0f11;--bg-card: #15161b;--bg-input: #1a1b20;--border-color: rgba(255, 255, 255, .05);--border-color-active: rgba(255, 255, 255, .1);--text-white: #ffffff;--text-gray: #a4a6b0;--text-muted: #5d5f66;--accent-orange: #f2a134;--accent-orange-hover: #e59325;--accent-cyan: #00cec9;--color-easy: #2ecc71;--color-easy-bg: rgba(46, 204, 113, .1);--color-medium: #f1c40f;--color-medium-bg: rgba(241, 196, 15, .1);--color-hard: #e74c3c;--color-hard-bg: rgba(231, 76, 60, .15);--transition-smooth: all .25s cubic-bezier(.4, 0, .2, 1);--radius-sm: 4px;--radius-md: 8px;--radius-lg: 12px}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-body);background-color:var(--bg-dark);color:var(--text-gray);min-height:100vh;overflow-x:hidden;line-height:1.6;-webkit-font-smoothing:antialiased}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:var(--bg-dark)}::-webkit-scrollbar-thumb{background:#ffffff1a;border-radius:3px}::-webkit-scrollbar-thumb:hover{background:var(--accent-orange)}.app-container{max-width:1400px;margin:0 auto;padding:1.5rem 2rem;display:flex;flex-direction:column;gap:2rem;min-height:100vh}.app-header{display:flex;justify-content:space-between;align-items:center;padding:1rem 0;border-bottom:1px solid var(--border-color)}.header-brand{display:flex;align-items:center;gap:.75rem}.logo-badge{background:#fff;padding:4px;border-radius:6px;width:32px;height:32px;display:flex;align-items:center;justify-content:center;overflow:hidden}.logo-badge img{width:24px;height:24px;object-fit:contain}.brand-title{font-family:var(--font-heading);font-size:1.4rem;font-weight:700;color:var(--text-white);letter-spacing:-.02em}.header-nav{display:flex;align-items:center;gap:1.5rem}.nav-links{display:flex;align-items:center;gap:1rem}.nav-link{display:flex;align-items:center;gap:.4rem;font-family:var(--font-heading);font-size:.9rem;font-weight:500;color:var(--text-gray);text-decoration:none;padding:.5rem 1rem;border-radius:var(--radius-md);transition:var(--transition-smooth)}.nav-link:hover{color:var(--text-white);background:#ffffff08}.nav-link.active{color:var(--text-white);background:#ffffff0d;border:1px solid rgba(255,255,255,.08)}.header-profile{display:flex;align-items:center}.header-avatar{width:32px;height:32px;border-radius:50%;border:1px solid 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p{font-size:1rem;color:var(--text-gray);margin-top:.25rem}.username-input-group{display:flex;flex-direction:column;gap:.5rem;max-width:450px}.username-label{font-size:.75rem;font-weight:600;text-transform:uppercase;color:var(--text-gray);letter-spacing:.05em}.terminal-input-wrapper{position:relative;display:flex;align-items:center}.terminal-icon{position:absolute;left:12px;color:var(--text-muted)}.terminal-input{width:100%;background:var(--bg-input);border:1px solid var(--border-color);border-radius:var(--radius-md);padding:.75rem 1rem .75rem 2.5rem;font-family:monospace;font-size:.95rem;color:var(--text-white);outline:none;transition:var(--transition-smooth)}.terminal-input:focus{border-color:var(--accent-orange);box-shadow:0 0 0 2px #f2a13426}.btn-input-enter{position:absolute;right:6px;background:var(--accent-orange);color:#000;border:none;border-radius:var(--radius-sm);padding:.4rem .9rem;font-family:var(--font-heading);font-size:.8rem;font-weight:700;cursor:pointer;transition:var(--transition-smooth)}.btn-input-enter:hover:not(:disabled){background:var(--accent-orange-hover)}.btn-input-enter:disabled{opacity:.5;cursor:not-allowed}.section-header-row{display:flex;justify-content:space-between;align-items:center;margin-bottom:1.25rem;border-bottom:1px solid rgba(255,255,255,.03);padding-bottom:.75rem}.section-title{display:flex;align-items:center;gap:.5rem;font-family:var(--font-heading);font-size:1.3rem;font-weight:600;color:var(--text-white)}.session-pill{background:#ffffff08;border:1px solid var(--border-color);padding:.25rem .6rem;border-radius:4px;font-family:monospace;font-size:.75rem;color:var(--text-gray);letter-spacing:.05em}.hero-card{background:var(--bg-card);border:1px solid 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.5rem;border-radius:4px}.difficulty-badge.easy{color:var(--color-easy);background:var(--color-easy-bg)}.difficulty-badge.medium{color:var(--color-medium);background:var(--color-medium-bg)}.difficulty-badge.hard{color:var(--color-hard);background:var(--color-hard-bg)}.hero-card-main{display:flex;justify-content:space-between;align-items:flex-start;gap:2rem}.hero-card-details{display:flex;flex-direction:column;gap:.5rem;flex:1}.hero-card-title{font-family:var(--font-heading);font-size:1.6rem;font-weight:700;color:var(--text-white)}.hero-card-description{font-size:.9rem;color:var(--text-gray);max-width:600px}.hero-card-stat{text-align:right;min-width:100px}.stat-label{font-size:.65rem;font-weight:600;color:var(--text-muted);text-transform:uppercase;letter-spacing:.08em;display:block}.stat-value{font-family:var(--font-heading);font-size:1.4rem;font-weight:700;color:var(--text-white);margin-top:.1rem}.hero-card-footer{display:flex;justify-content:space-between;align-items:center;border-top:1px solid rgba(255,255,255,.03);padding-top:1.25rem}.tags-row{display:flex;flex-wrap:wrap;gap:.5rem}.tag-pill{background:#ffffff08;border:1px solid var(--border-color);color:var(--text-gray);font-size:.75rem;padding:.2rem .6rem;border-radius:4px;font-weight:500}.hero-arrow{color:var(--text-muted);display:flex;align-items:center;transition:var(--transition-smooth)}.hero-card:hover .hero-arrow{color:var(--text-white);transform:translate(4px)}.problems-grid{display:grid;grid-template-columns:1fr;gap:1.25rem}@media (min-width: 640px){.problems-grid{grid-template-columns:repeat(2,1fr)}}.problem-card{background:var(--bg-card);border:1px solid 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rgba(255,255,255,.03);padding-top:1rem}.profile-stat-row{display:flex;justify-content:space-between;align-items:center;font-size:.85rem}.profile-stat-row .stat-label{font-size:.85rem;text-transform:none;letter-spacing:0;color:var(--text-gray)}.profile-stat-row .stat-value{font-size:.85rem;margin-top:0}.text-weakness{color:var(--color-hard)!important}.text-activity{color:var(--color-easy)!important}.trajectory-panel{background:var(--bg-card);border:1px solid 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var(--border-color);border-radius:var(--radius-md);padding:1rem;display:flex;flex-direction:column;gap:.25rem}.trajectory-stat-box .box-label{font-size:.65rem;font-weight:700;text-transform:uppercase;color:var(--text-muted);letter-spacing:.05em}.trajectory-stat-box .box-value{font-family:var(--font-heading);font-size:1.25rem;font-weight:700;color:var(--text-white)}.text-streak{color:var(--color-medium)!important}.status-container{display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:4rem 2rem;gap:1rem;border:1px dashed var(--border-color);border-radius:var(--radius-lg);background:#ffffff03}.status-icon{color:var(--text-muted)}.status-title{font-family:var(--font-heading);font-size:1.2rem;font-weight:600;color:var(--text-white)}.status-desc{font-size:.9rem;color:var(--text-gray);max-width:450px}.status-error{border-color:#e74c3c33;background:#e74c3c05}.status-error-icon{color:var(--color-hard)}.skeleton-card{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:1.5rem;display:flex;flex-direction:column;gap:1rem}.skeleton-shimmer{background:linear-gradient(90deg,#ffffff05 25%,#ffffff0f,#ffffff05 75%);background-size:200% 100%;animation:loading-shimmer 1.5s infinite ease-in-out;border-radius:4px}@keyframes loading-shimmer{0%{background-position:200% 0}to{background-position:-200% 0}}.sk-line-sm{height:12px;width:40%}.sk-line-md{height:20px;width:80%}.sk-line-lg{height:16px;width:100%}.sk-tags{height:24px;width:60%}.login-container{display:flex;justify-content:center;align-items:center;min-height:100vh;padding:2rem;background:radial-gradient(circle at 15% 50%,rgba(0,206,201,.08),transparent 25%),radial-gradient(circle at 85% 30%,rgba(242,161,52,.08),transparent 25%),var(--bg-dark);position:relative;overflow:hidden}.login-container:before{content:"";position:absolute;top:0;left:0;right:0;bottom:0;background-image:linear-gradient(rgba(255,255,255,.02) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.02) 1px,transparent 1px);background-size:40px 40px;z-index:0;pointer-events:none}.login-box{background:#15161b99;backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border:1px solid rgba(255,255,255,.08);border-radius:var(--radius-lg);padding:3.5rem;max-width:480px;width:100%;box-shadow:0 20px 50px #0006,inset 0 0 0 1px #ffffff0d;display:flex;flex-direction:column;gap:2rem;align-items:center;position:relative;z-index:1;animation:login-fade-in .6s cubic-bezier(.16,1,.3,1)}@keyframes login-fade-in{0%{opacity:0;transform:translateY(20px) scale(.98)}to{opacity:1;transform:translateY(0) scale(1)}}.login-header{display:flex;flex-direction:column;align-items:center;gap:1.25rem;margin-bottom:.5rem;position:relative}.login-header:before{content:"";position:absolute;width:100px;height:100px;background:var(--accent-orange);filter:blur(60px);opacity:.15;border-radius:50%;z-index:-1;top:-20px}.login-header .logo-badge{background:linear-gradient(135deg,#fff,#f0f0f0);box-shadow:0 4px 15px #0003;transition:transform .3s ease}.login-box:hover .logo-badge{transform:scale(1.05) rotate(-5deg)}.login-header .brand-title{font-family:var(--font-heading);font-size:2.2rem;font-weight:700;background:linear-gradient(to right,var(--text-white),var(--text-gray));-webkit-background-clip:text;-webkit-text-fill-color:transparent;letter-spacing:-.03em;margin:0}.login-subtitle{font-size:1rem;color:var(--text-gray);text-align:center;margin-bottom:.5rem;line-height:1.5}.login-form{width:100%;display:flex;flex-direction:column;gap:1.25rem}.login-form .terminal-input-wrapper{transition:transform .3s ease}.login-form .terminal-input-wrapper:focus-within{transform:translateY(-2px)}.login-form .terminal-input{background:#0000004d;border:1px solid rgba(255,255,255,.1);padding:1.1rem 1.1rem 1.1rem 3.2rem;font-size:1.05rem;border-radius:var(--radius-md);box-shadow:inset 0 2px 4px #0003;width:100%;color:var(--text-white);outline:none;font-family:monospace;transition:var(--transition-smooth)}.login-form .terminal-icon{color:var(--text-muted);position:absolute;left:16px;top:50%;transform:translateY(-50%);transition:var(--transition-smooth)}.login-form .terminal-input-wrapper:focus-within .terminal-icon{color:var(--accent-cyan)}.login-form .terminal-input:focus{border-color:var(--accent-cyan);box-shadow:0 0 0 2px #00cec926,inset 0 2px 4px #0003}.btn-login-submit{width:100%;background:linear-gradient(135deg,var(--accent-orange),#f39c12);color:#000;border:none;border-radius:var(--radius-md);padding:1.1rem;font-family:var(--font-heading);font-size:1.05rem;font-weight:700;cursor:pointer;transition:all .3s cubic-bezier(.16,1,.3,1);margin-top:.5rem;box-shadow:0 4px 15px #f2a13440;display:flex;align-items:center;justify-content:center;gap:.75rem}.btn-login-submit:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 8px 25px #f2a13466;background:linear-gradient(135deg,#f5a947,#f39c12)}.btn-login-submit:active:not(:disabled){transform:translateY(1px);box-shadow:0 2px 10px #f2a13433}.btn-login-submit:disabled{background:#ffffff0d;color:var(--text-muted);box-shadow:none;border:1px solid rgba(255,255,255,.1)}.btn-logout{background:#e74c3c1a;color:var(--color-hard);border:1px solid rgba(231,76,60,.2);border-radius:var(--radius-sm);padding:.4rem .8rem;font-size:.75rem;font-weight:600;cursor:pointer;transition:var(--transition-smooth)}.btn-logout:hover{background:#e74c3c33}@keyframes spin{to{transform:rotate(360deg)}}.animate-spin{animation:spin 1s linear infinite}