@import "https://cdn.jsdelivr.net/gh/orioncactus/pretendard@v1.3.9/dist/web/variable/pretendardvariable-dynamic-subset.min.css";:root{--bg-primary:#fff;--bg-secondary:#f6f8fc;--bg-tertiary:#edf0f7;--bg-mesh-1:#e8edff;--bg-mesh-2:#f0e8ff;--bg-mesh-3:#e8f4ff;--text-primary:#0f172a;--text-secondary:#475569;--text-tertiary:#94a3b8;--text-quaternary:#cbd5e1;--border-color:#94a3b826;--accent-blue:#6366f1;--accent-blue-hover:#4f46e5;--accent-blue-light:#6366f114;--accent-blue-glow:#6366f140;--accent-green:#10b981;--accent-green-light:#10b98114;--accent-orange:#f59e0b;--accent-orange-light:#f59e0b14;--accent-red:#ef4444;--accent-red-light:#ef444414;--accent-purple:#8b5cf6;--accent-purple-light:#8b5cf614;--accent-cyan:#06b6d4;--gradient-primary:linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #a78bfa 100%);--gradient-hero:linear-gradient(135deg, #6366f1 0%, #8b5cf6 40%, #ec4899 100%);--gradient-card:linear-gradient(135deg, #6366f108 0%, #8b5cf608 100%);--glass-bg:#ffffffb8;--glass-border:#ffffff80;--card-shadow:0 1px 3px #0f172a0a, 0 1px 2px #0f172a05;--card-shadow-hover:0 20px 40px #0f172a14, 0 4px 12px #0f172a0a;--card-shadow-glow:0 8px 32px #6366f11f, 0 2px 8px #6366f10f;--radius-sm:12px;--radius-md:16px;--radius-lg:22px;--radius-xl:28px;--radius-full:9999px;--transition:all .25s cubic-bezier(.4, 0, .2, 1);--transition-bounce:all .4s cubic-bezier(.34, 1.56, .64, 1)}*{box-sizing:border-box;margin:0;padding:0}html{-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;scroll-behavior:smooth}body{background:var(--bg-secondary);color:var(--text-primary);letter-spacing:-.02em;min-height:100vh;font-family:Pretendard Variable,Pretendard,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;line-height:1.6;overflow-x:hidden}body:before{content:"";background:radial-gradient(circle at 20% 20%, var(--bg-mesh-1) 0%, transparent 50%), radial-gradient(circle at 80% 30%, var(--bg-mesh-2) 0%, transparent 50%), radial-gradient(circle at 50% 80%, var(--bg-mesh-3) 0%, transparent 50%);z-index:-1;width:200%;height:200%;animation:20s ease-in-out infinite meshFloat;position:fixed;top:-50%;left:-50%}@keyframes meshFloat{0%,to{transform:translate(0)rotate(0)}33%{transform:translate(2%,-1%)rotate(1deg)}66%{transform:translate(-1%,2%)rotate(-1deg)}}a{color:inherit;text-decoration:none}button,input,textarea{letter-spacing:-.02em;font-family:inherit}::selection{background:var(--accent-blue);color:#fff}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:var(--text-quaternary);border-radius:3px}::-webkit-scrollbar-thumb:hover{background:var(--text-tertiary)}.container{max-width:760px;margin:0 auto;padding:0 24px}.header{z-index:100;-webkit-backdrop-filter:blur(20px)saturate(180%);border-bottom:1px solid var(--border-color);background:#f6f8fcc7;position:sticky;top:0}.header-inner{justify-content:space-between;align-items:center;height:60px;display:flex}.logo{color:var(--text-primary);letter-spacing:-.04em;align-items:center;gap:10px;font-size:1.3rem;font-weight:800;display:flex}.logo-dot{background:var(--gradient-primary);width:10px;height:10px;box-shadow:0 0 12px var(--accent-blue-glow);border-radius:50%;animation:2s ease-in-out infinite pulse;display:inline-block}@keyframes pulse{0%,to{box-shadow:0 0 12px var(--accent-blue-glow);transform:scale(1)}50%{box-shadow:0 0 20px var(--accent-blue-glow);transform:scale(1.15)}}.header-right{align-items:center;gap:12px;display:flex}.nav-links{gap:4px;display:flex}.user-info{align-items:center;gap:8px;display:flex}.user-nickname{color:var(--accent-blue);font-size:.82rem;font-weight:700}.login-overlay{-webkit-backdrop-filter:blur(8px);z-index:200;background:#0f172a80;justify-content:center;align-items:center;animation:.2s fadeIn;display:flex;position:fixed;inset:0}.login-modal{background:var(--bg-primary);border-radius:var(--radius-xl);width:90%;max-width:380px;box-shadow:var(--card-shadow-hover);padding:36px 32px;animation:.3s cubic-bezier(.34,1.56,.64,1) slideUp}.login-modal h2{letter-spacing:-.04em;margin-bottom:8px;font-size:1.3rem;font-weight:900}.login-modal p{color:var(--text-tertiary);margin-bottom:20px;font-size:.85rem}.login-input{background:var(--bg-secondary);border:1.5px solid var(--border-color);border-radius:var(--radius-md);width:100%;color:var(--text-primary);transition:var(--transition);margin-bottom:12px;padding:14px 18px;font-size:.95rem}.login-input:focus{border-color:var(--accent-blue);box-shadow:0 0 0 4px var(--accent-blue-light);outline:none}.login-error{color:var(--accent-red);margin-bottom:8px;font-size:.82rem}.login-switch{text-align:center;color:var(--text-tertiary);margin-top:16px;font-size:.82rem}.switch-btn{color:var(--accent-blue);cursor:pointer;background:0 0;border:none;padding:0;font-size:.82rem;font-weight:700}.switch-btn:hover{text-decoration:underline}.login-btn{background:var(--gradient-primary);color:#fff;border-radius:var(--radius-full);cursor:pointer;transition:var(--transition);border:none;padding:7px 16px;font-size:.82rem;font-weight:700}.login-btn:hover{box-shadow:0 4px 12px var(--accent-blue-glow);transform:translateY(-1px)}.logout-btn{border:1px solid var(--border-color);color:var(--text-tertiary);border-radius:var(--radius-full);cursor:pointer;transition:var(--transition);background:0 0;padding:5px 12px;font-size:.75rem;font-weight:600}.logout-btn:hover{border-color:var(--accent-red);color:var(--accent-red)}.nav-links a{color:var(--text-tertiary);border-radius:var(--radius-full);transition:var(--transition);padding:8px 16px;font-size:.88rem;font-weight:600;position:relative}.nav-links a:hover{color:var(--text-primary);background:#6366f10f}.nav-links a.active{color:var(--accent-blue);background:var(--accent-blue-light);font-weight:700}.hero{text-align:center;padding:52px 0 12px;position:relative}.hero h1{background:var(--gradient-hero);-webkit-text-fill-color:transparent;letter-spacing:-.05em;-webkit-background-clip:text;background-clip:text;margin-bottom:12px;font-size:2.2rem;font-weight:900;line-height:1.3}.hero p{color:var(--text-tertiary);font-size:1rem;font-weight:400;line-height:1.6}.stats-summary{grid-template-columns:repeat(3,1fr);gap:14px;margin:28px 0;display:grid}.stats-summary-card{background:var(--glass-bg);-webkit-backdrop-filter:blur(12px);border:1px solid var(--glass-border);border-radius:var(--radius-lg);text-align:center;transition:var(--transition);padding:24px 16px;position:relative;overflow:hidden}.stats-summary-card:before{content:"";background:var(--gradient-primary);opacity:0;height:3px;transition:var(--transition);position:absolute;top:0;left:0;right:0}.stats-summary-card:hover:before{opacity:1}.stats-summary-card:hover{box-shadow:var(--card-shadow-glow);transform:translateY(-4px)}.stats-summary-value{background:var(--gradient-primary);-webkit-text-fill-color:transparent;letter-spacing:-.04em;-webkit-background-clip:text;background-clip:text;font-size:1.75rem;font-weight:900}.stats-summary-label{color:var(--text-tertiary);text-transform:uppercase;letter-spacing:.04em;margin-top:6px;font-size:.78rem;font-weight:600}.search-bar{margin:24px 0 28px;position:relative}.search-icon{color:var(--text-quaternary);pointer-events:none;transition:var(--transition);font-size:1rem;position:absolute;top:50%;left:18px;transform:translateY(-50%)}.search-bar:focus-within .search-icon{color:var(--accent-blue)}.search-input{background:var(--glass-bg);-webkit-backdrop-filter:blur(12px);border:1.5px solid var(--border-color);border-radius:var(--radius-lg);width:100%;color:var(--text-primary);transition:var(--transition);padding:16px 20px 16px 48px;font-size:.95rem}.search-input::placeholder{color:var(--text-quaternary)}.search-input:focus{border-color:var(--accent-blue);box-shadow:0 0 0 4px var(--accent-blue-light), var(--card-shadow-glow);background:var(--bg-primary);outline:none}.section-title{color:var(--text-primary);letter-spacing:-.03em;align-items:center;gap:8px;margin-bottom:16px;font-size:1.05rem;font-weight:800;display:flex}.section-title:before{content:"";background:var(--gradient-primary);border-radius:2px;width:4px;height:18px}.categories-grid{grid-template-columns:repeat(2,1fr);gap:14px;padding-bottom:48px;display:grid}.category-card{background:var(--glass-bg);-webkit-backdrop-filter:blur(12px);border:1px solid var(--glass-border);border-radius:var(--radius-lg);transition:var(--transition-bounce);cursor:pointer;flex-direction:column;gap:10px;padding:26px 22px;display:flex;position:relative;overflow:hidden}.category-card:after{content:"";background:var(--gradient-card);opacity:0;transition:var(--transition);position:absolute;inset:0}.category-card:hover{box-shadow:var(--card-shadow-hover);border-color:#6366f133;transform:translateY(-6px)scale(1.01)}.category-card:hover:after{opacity:1}.category-card:active{transform:translateY(-2px)scale(.99)}.category-icon{z-index:1;filter:drop-shadow(0 2px 4px #0000001a);font-size:2.2rem;line-height:1;position:relative}.category-card h3{color:var(--text-primary);letter-spacing:-.02em;z-index:1;font-size:.95rem;font-weight:700;position:relative}.category-card p{color:var(--text-tertiary);z-index:1;font-size:.8rem;font-weight:400;line-height:1.5;position:relative}.category-count{color:var(--accent-blue);z-index:1;margin-top:auto;font-size:.75rem;font-weight:600;position:relative}.page-header{padding:32px 0 24px}.page-header h1{letter-spacing:-.04em;color:var(--text-primary);margin-bottom:8px;font-size:1.6rem;font-weight:900}.page-header p{color:var(--text-tertiary);font-size:.92rem}.back-link{color:var(--text-tertiary);transition:var(--transition);border-radius:var(--radius-sm);align-items:center;gap:6px;margin-bottom:12px;margin-left:-12px;padding:6px 12px;font-size:.88rem;font-weight:600;display:inline-flex}.back-link:hover{color:var(--accent-blue);background:var(--accent-blue-light)}.filter-row{gap:8px;margin-bottom:18px;padding-bottom:4px;display:flex;overflow-x:auto}.filter-chip{border-radius:var(--radius-full);border:1.5px solid var(--border-color);background:var(--glass-bg);-webkit-backdrop-filter:blur(8px);color:var(--text-secondary);cursor:pointer;transition:var(--transition);white-space:nowrap;flex-shrink:0;padding:8px 18px;font-size:.82rem;font-weight:600}.filter-chip:hover{border-color:var(--accent-blue);color:var(--accent-blue);background:var(--accent-blue-light)}.filter-chip.active{background:var(--gradient-primary);color:#fff;box-shadow:0 4px 12px var(--accent-blue-glow);border-color:#0000}.question-list{flex-direction:column;gap:10px;padding-bottom:48px;display:flex}.question-item{background:var(--glass-bg);-webkit-backdrop-filter:blur(12px);border:1px solid var(--glass-border);border-radius:var(--radius-md);transition:var(--transition);cursor:pointer;align-items:center;gap:16px;padding:20px 22px;display:flex}.question-item:hover{box-shadow:var(--card-shadow-hover);border-color:#6366f133;transform:translate(4px)}.question-item:active{transform:translate(2px)}.question-number{border-radius:var(--radius-sm);background:var(--gradient-primary);color:#fff;width:40px;height:40px;box-shadow:0 2px 8px var(--accent-blue-glow);flex-shrink:0;justify-content:center;align-items:center;font-size:.82rem;font-weight:800;display:flex}.question-item-body{flex:1;min-width:0}.question-item h3{color:var(--text-primary);letter-spacing:-.01em;margin-bottom:6px;font-size:.93rem;font-weight:650;line-height:1.4}.question-meta{flex-wrap:wrap;align-items:center;gap:6px;display:flex}.question-item-arrow{color:var(--text-quaternary);transition:var(--transition);flex-shrink:0;font-size:1.1rem}.question-item:hover .question-item-arrow{color:var(--accent-blue);transform:translate(4px)}.badge{border-radius:var(--radius-full);letter-spacing:.02em;align-items:center;padding:3px 10px;font-size:.68rem;font-weight:700;display:inline-flex}.badge-basic{background:var(--accent-green-light);color:var(--accent-green)}.badge-intermediate{background:var(--accent-orange-light);color:var(--accent-orange)}.badge-advanced{background:var(--accent-red-light);color:var(--accent-red)}.badge-study{background:var(--accent-blue-light);color:var(--accent-blue)}.badge-bookmark{background:var(--accent-purple-light);color:var(--accent-purple)}.question-detail{padding-bottom:60px}.question-detail h1{letter-spacing:-.03em;color:var(--text-primary);margin-bottom:14px;font-size:1.4rem;font-weight:900;line-height:1.45}.question-content{background:var(--glass-bg);-webkit-backdrop-filter:blur(12px);border:1px solid var(--glass-border);border-radius:var(--radius-lg);white-space:pre-wrap;color:var(--text-secondary);word-break:keep-all;margin-bottom:16px;padding:28px;font-size:.93rem;line-height:1.85}.action-row{gap:8px;margin:14px 0 24px;display:flex}.action-btn{background:var(--glass-bg);-webkit-backdrop-filter:blur(8px);color:var(--text-secondary);border:1.5px solid var(--border-color);border-radius:var(--radius-full);cursor:pointer;transition:var(--transition);align-items:center;gap:6px;padding:10px 20px;font-size:.85rem;font-weight:600;display:inline-flex}.action-btn:hover{border-color:var(--accent-blue);color:var(--accent-blue);background:var(--accent-blue-light)}.action-btn.active{background:var(--gradient-primary);color:#fff;box-shadow:0 4px 12px var(--accent-blue-glow);border-color:#0000}.grading-section{margin-top:32px}.grading-section h2{color:var(--text-primary);letter-spacing:-.03em;margin-bottom:14px;font-size:1.15rem;font-weight:800}.answer-input{background:var(--glass-bg);-webkit-backdrop-filter:blur(12px);border:1.5px solid var(--border-color);border-radius:var(--radius-lg);width:100%;min-height:160px;color:var(--text-primary);resize:vertical;transition:var(--transition);padding:20px;font-family:inherit;font-size:.95rem;line-height:1.7}.answer-input::placeholder{color:var(--text-quaternary)}.answer-input:focus{border-color:var(--accent-blue);box-shadow:0 0 0 4px var(--accent-blue-light), var(--card-shadow-glow);background:var(--bg-primary);outline:none}.submit-btn{background:var(--gradient-primary);color:#fff;border-radius:var(--radius-md);cursor:pointer;transition:var(--transition);letter-spacing:-.01em;border:none;width:100%;margin-top:14px;padding:16px 32px;font-size:.95rem;font-weight:700;position:relative;overflow:hidden}.submit-btn:before{content:"";opacity:0;transition:var(--transition);background:linear-gradient(135deg,#fff3 0%,#0000 100%);position:absolute;inset:0}.submit-btn:hover:before{opacity:1}.submit-btn:hover{box-shadow:0 8px 24px var(--accent-blue-glow);transform:translateY(-2px)}.submit-btn:active{transform:translateY(0)}.submit-btn:disabled{opacity:.4;cursor:not-allowed;box-shadow:none;transform:none}.grade-result{background:var(--glass-bg);-webkit-backdrop-filter:blur(12px);border:1px solid var(--glass-border);border-radius:var(--radius-xl);margin-top:24px;padding:32px 28px;animation:.5s cubic-bezier(.34,1.56,.64,1) slideUp}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)scale(.96)}to{opacity:1;transform:translateY(0)scale(1)}}.grade-score-wrapper{text-align:center;border-bottom:1px solid var(--border-color);margin-bottom:24px;padding-bottom:24px}.grade-score-circle{letter-spacing:-.04em;border-radius:50%;justify-content:center;align-items:center;width:88px;height:88px;margin-bottom:10px;font-size:2rem;font-weight:900;display:inline-flex;position:relative}.grade-score-circle:after{content:"";background:var(--gradient-primary) border-box;-webkit-mask-composite:xor;opacity:.3;border:2px solid #0000;border-radius:50%;position:absolute;inset:-4px;-webkit-mask-image:linear-gradient(#fff 0 0),linear-gradient(#fff 0 0);-webkit-mask-position:0 0,0 0;-webkit-mask-size:auto,auto;-webkit-mask-repeat:repeat,repeat;-webkit-mask-clip:padding-box,border-box;-webkit-mask-origin:padding-box,border-box;-webkit-mask-composite:xor;mask-composite:exclude;-webkit-mask-source-type:auto,auto;mask-mode:match-source,match-source}.grade-A .grade-score-circle{background:var(--accent-green-light);color:var(--accent-green)}.grade-B .grade-score-circle{background:var(--accent-blue-light);color:var(--accent-blue)}.grade-C .grade-score-circle{background:var(--accent-orange-light);color:var(--accent-orange)}.grade-D .grade-score-circle{background:var(--accent-orange-light);color:#d97706}.grade-F .grade-score-circle{background:var(--accent-red-light);color:var(--accent-red)}.grade-points{color:var(--text-tertiary);font-size:.88rem;font-weight:600}.grade-feedback{color:var(--text-secondary);word-break:keep-all;margin-bottom:20px;font-size:.92rem;line-height:1.75}.keywords-section{margin-top:16px}.keywords-label{color:var(--text-primary);margin-bottom:8px;font-size:.82rem;font-weight:700}.keywords{flex-wrap:wrap;gap:6px;display:flex}.keyword-matched{background:var(--accent-green-light);color:var(--accent-green);border-radius:var(--radius-full);padding:4px 14px;font-size:.78rem;font-weight:600}.keyword-missed{background:var(--accent-red-light);color:var(--accent-red);border-radius:var(--radius-full);padding:4px 14px;font-size:.78rem;font-weight:600}.answer-section{margin-top:32px}.answer-section h2{color:var(--text-primary);letter-spacing:-.03em;margin-bottom:14px;font-size:1.15rem;font-weight:800}.toggle-btn{background:var(--glass-bg);-webkit-backdrop-filter:blur(8px);color:var(--text-secondary);border:1.5px solid var(--border-color);border-radius:var(--radius-md);cursor:pointer;transition:var(--transition);width:100%;padding:14px 24px;font-size:.9rem;font-weight:600}.toggle-btn:hover{border-color:var(--accent-blue);color:var(--accent-blue);background:var(--accent-blue-light)}.answer-box{background:var(--glass-bg);-webkit-backdrop-filter:blur(12px);border:1px solid var(--glass-border);border-radius:var(--radius-lg);white-space:pre-wrap;color:var(--text-secondary);word-break:keep-all;border-left:4px solid;border-image:var(--gradient-primary) 1;margin-top:12px;padding:28px;font-size:.93rem;line-height:1.85;animation:.35s cubic-bezier(.4,0,.2,1) slideUp}.stats-grid{grid-template-columns:repeat(2,1fr);gap:14px;margin-bottom:32px;display:grid}.stat-card{background:var(--glass-bg);-webkit-backdrop-filter:blur(12px);border:1px solid var(--glass-border);border-radius:var(--radius-lg);text-align:center;transition:var(--transition);padding:24px 18px;position:relative;overflow:hidden}.stat-card:before{content:"";background:var(--gradient-primary);opacity:0;height:3px;transition:var(--transition);position:absolute;top:0;left:0;right:0}.stat-card:hover{box-shadow:var(--card-shadow-glow);transform:translateY(-4px)}.stat-card:hover:before{opacity:1}.stat-value{background:var(--gradient-primary);-webkit-text-fill-color:transparent;letter-spacing:-.04em;-webkit-background-clip:text;background-clip:text;font-size:1.85rem;font-weight:900}.stat-label{color:var(--text-tertiary);text-transform:uppercase;letter-spacing:.04em;margin-top:6px;font-size:.8rem;font-weight:600}.stats-section{margin-bottom:32px}.stats-section h2{letter-spacing:-.03em;align-items:center;gap:8px;margin-bottom:16px;font-size:1.15rem;font-weight:800;display:flex}.stats-section h2:before{content:"";background:var(--gradient-primary);border-radius:2px;width:4px;height:18px}.progress-wrapper{background:var(--glass-bg);-webkit-backdrop-filter:blur(12px);border:1px solid var(--glass-border);border-radius:var(--radius-lg);margin-bottom:28px;padding:24px}.progress-bar-outer{background:var(--bg-tertiary);border-radius:var(--radius-full);height:12px;overflow:hidden}.progress-bar-inner{background:var(--gradient-primary);border-radius:var(--radius-full);height:100%;transition:width .8s cubic-bezier(.4,0,.2,1);position:relative}.progress-bar-inner:after{content:"";background:linear-gradient(90deg,#0000,#ffffff4d,#0000);animation:2s infinite shimmer;position:absolute;inset:0}@keyframes shimmer{0%{transform:translate(-100%)}to{transform:translate(100%)}}.bar-chart{background:var(--glass-bg);-webkit-backdrop-filter:blur(12px);border:1px solid 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0;font-size:.95rem;font-weight:500}.loading-spinner{border:3px solid var(--bg-tertiary);border-top-color:var(--accent-blue);border-radius:50%;width:36px;height:36px;margin:0 auto 14px;animation:.8s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}.empty{text-align:center;color:var(--text-quaternary);padding:100px 0;font-size:.95rem}.empty-icon{margin-bottom:14px;font-size:2.8rem}@media (width<=640px){.container{padding:0 16px}.hero h1{font-size:1.7rem}.user-name{display:none}.categories-grid{grid-template-columns:1fr}.stats-grid{grid-template-columns:repeat(2,1fr)}.stats-summary{grid-template-columns:repeat(3,1fr);gap:8px}.stats-summary-card{padding:16px 10px}.stats-summary-value{font-size:1.3rem}.bar-label{width:80px;font-size:.75rem}.question-item{padding:16px 18px}.grade-result{padding:24px 20px}}@media (width>=641px){.categories-grid{grid-template-columns:repeat(2,1fr)}}@media 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