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.level-icon-large{background:linear-gradient(135deg,#10b98126,#10b9810d);color:var(--success)}.level-name{font-size:1.5rem;font-weight:700;color:var(--text-primary);margin-bottom:.5rem}.level-description{color:var(--text-secondary);line-height:1.6;margin-bottom:1.5rem}.level-meta{display:flex;align-items:center;gap:.75rem;margin-bottom:2rem}.meta-item{font-size:.8125rem;color:var(--text-muted);font-weight:500}.meta-divider{color:var(--border)}.btn-level{width:100%;display:flex;align-items:center;justify-content:center;gap:.5rem;padding:1rem 1.5rem;border:none;border-radius:10px;font-size:.9375rem;font-weight:600;cursor:pointer;transition:all .3s ease}.primary-btn{background:linear-gradient(135deg,var(--primary),var(--accent-dark));color:#fff;box-shadow:0 4px 16px #3b82f64d}.primary-btn:hover{background:linear-gradient(135deg,var(--primary-dark),var(--accent-dark));transform:translateY(-2px);box-shadow:0 8px 24px 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fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.student-video-card{animation:fadeIn .3s ease-out}.student-card{animation:fadeIn .2s ease-out}:root{--primary: #3b82f6;--primary-dark: #2563eb;--primary-light: #60a5fa;--accent: #06b6d4;--accent-dark: #0891b2;--success: #10b981;--background: #050505;--surface: #0f0f14;--surface-hover: #1a1a24;--surface-light: #252530;--border: #27272a;--border-light: #3f3f46;--text-primary: #fafafa;--text-secondary: #a1a1aa;--text-muted: #71717a}.rules-container{min-height:100vh;background:var(--background);color:var(--text-primary);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Inter,sans-serif;position:relative;overflow-x:hidden;padding:2rem}.rules-background{position:fixed;top:0;left:0;width:100%;height:100%;z-index:0;pointer-events:none}.orb-1{width:600px;height:600px;background:radial-gradient(circle,rgba(59,130,246,.4) 0%,transparent 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var(--border)}.rules-card::-webkit-scrollbar{width:10px}.rules-card::-webkit-scrollbar-track{background:var(--surface);border-radius:10px}.rules-card::-webkit-scrollbar-thumb{background:linear-gradient(135deg,var(--primary),var(--accent));border-radius:10px;border:2px solid var(--surface)}.rules-card::-webkit-scrollbar-thumb:hover{background:linear-gradient(135deg,var(--primary-dark),var(--accent-dark))}.rules-footer{display:flex;flex-direction:column;align-items:center;gap:2rem;animation:fadeIn 1s ease-out}.checkbox-label{display:flex;align-items:center;gap:1rem;cursor:pointer;-webkit-user-select:none;user-select:none;background:#0f0f14cc;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border:1px solid var(--border);padding:1.25rem 2rem;border-radius:14px;transition:all .3s ease}.checkbox-label:hover{background:#0f0f14f2;border-color:var(--primary);box-shadow:0 8px 24px #3b82f626}.checkbox-input{position:absolute;opacity:0;cursor:pointer}.checkbox-custom{width:26px;height:26px;border:2px solid var(--border-light);border-radius:8px;position:relative;transition:all .3s ease;background:var(--surface-light);flex-shrink:0}.checkbox-input:checked~.checkbox-custom{border-color:var(--primary);background:linear-gradient(135deg,var(--primary),var(--accent))}.checkbox-input:checked~.checkbox-custom:after{content:"✓";position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);color:#fff;font-size:18px;font-weight:700}.checkbox-text{color:var(--text-primary);font-weight:500;font-size:1.05rem}.btn-start{background:linear-gradient(135deg,var(--primary),var(--accent-dark));color:#fff;border:none;border-radius:14px;padding:1.5rem 3.5rem;font-size:1.25rem;font-weight:700;font-family:inherit;cursor:pointer;transition:all .3s ease;box-shadow:0 8px 28px 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#10b98166}.modal-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background:#000000d9;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);display:flex;align-items:center;justify-content:center;z-index:2000;animation:fadeIn .2s ease-out}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.modal-content{background:var(--surface);padding:2.5rem;border-radius:20px;max-width:450px;width:90%;text-align:center;border:1px solid var(--border);box-shadow:0 25px 50px #00000080;animation:scaleUp .3s cubic-bezier(.175,.885,.32,1.275)}@keyframes scaleUp{0%{transform:scale(.9);opacity:0}to{transform:scale(1);opacity:1}}.modal-content h3{margin:0 0 1rem;color:var(--text-primary);font-size:1.75rem}.modal-content p{color:var(--text-secondary);margin:.5rem 0;font-size:1.1rem}.modal-buttons{display:flex;gap:1rem;margin-top:2.5rem}.btn-cancel,.btn-confirm{flex:1;padding:1rem;font-size:1rem;font-weight:600;font-family:Inter,sans-serif;border:none;border-radius:10px;cursor:pointer;transition:all 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#10b98166}.btn-confirm:disabled{opacity:.7;cursor:not-allowed;filter:grayscale(.5)}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:var(--background)}::-webkit-scrollbar-thumb{background:var(--surface-light);border-radius:4px}::-webkit-scrollbar-thumb:hover{background:var(--border-light)}@media(max-width:1024px){.mcq-content{grid-template-columns:1fr;height:auto;padding-bottom:80px}.question-palette{order:-1;max-height:300px;margin-bottom:2rem}.mcq-content{display:flex;flex-direction:column-reverse}.mcq-content{display:block}.question-section{margin-bottom:2rem}}@media(max-width:768px){.mcq-header{flex-direction:column;gap:1rem;align-items:center;text-align:center;padding:1rem}.header-left{text-align:center}.timer{font-size:1.5rem}.mcq-content{padding:1rem}.question-section{padding:1.5rem}.palette-grid{grid-template-columns:repeat(5,1fr)}.camera-preview{width:120px;height:90px;bottom:10px;right:10px}}:root{--bg-primary: #1a1a1a;--bg-secondary: #262626;--bg-tertiary: #2d2d2d;--bg-hover: #333333;--bg-navbar: #282828;--accent-primary: #ffa116;--accent-success: #00b8a3;--accent-error: #ef4743;--accent-warning: #ffc01e;--accent-blue: #2db55d;--text-primary: #eff1f6bf;--text-secondary: #a6a6a6;--text-tertiary: #777777;--text-white: #ffffff;--border-primary: #3a3a3a;--border-secondary: #4a4a4a;--code-bg: #1e1e1e;--code-selection: #264f78;--shadow-sm: 0 1px 3px rgba(0, 0, 0, .3);--shadow-md: 0 2px 8px rgba(0, 0, 0, .4);--shadow-lg: 0 4px 16px rgba(0, 0, 0, .5)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,sans-serif;background:var(--bg-primary);color:var(--text-primary);line-height:1.6}.leetcode-container{display:flex;flex-direction:column;height:100vh;overflow:hidden}.top-navbar{background:var(--bg-navbar);border-bottom:1px solid var(--border-primary);padding:0 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#ffa1161a}.eden-pixel-link{color:var(--text-secondary);text-decoration:none;font-size:.875rem;font-weight:500;transition:color .2s ease;background:linear-gradient(135deg,#ffa116,#00b8a3);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.eden-pixel-link:hover{opacity:.8}.split-container{display:flex;height:calc(100vh - 50px);overflow:hidden}.left-panel,.right-panel{height:100%;overflow:auto}.left-panel{width:40%;background:var(--bg-primary);border-right:1px solid var(--border-primary)}.right-panel{width:60%;background:var(--bg-secondary);display:flex;flex-direction:column}.panel-content{padding:1.5rem}.problem-header{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:1.5rem}.problem-title{font-size:1.5rem;font-weight:600;color:var(--text-white);line-height:1.3}.difficulty-badge{background:var(--accent-primary);color:var(--bg-primary);padding:.25rem 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