:root{--primary-color:#1a237e;--primary-dark:#283593;--primary-light:#3f51b5;--accent-color:#ffed4e;--accent-orange:#ff8c3a;--accent-orange-dark:#e8440f;--bg-light:#f0f2f5;--bg-white:#ffffff;--text-dark:#333333;--text-light:#555555;--border-color:#e0e0e0;--code-bg:#2d2d2d;--code-text:#f8f8f2;--font-base:16px;--font-small:14px;--font-tiny:12px}html[data-theme=dark]{--bg-light:#1a1a1a;--bg-white:#2d2d2d;--text-dark:#e0e0e0;--text-light:#b0b0b0;--border-color:#404040}html[data-code-theme=monokai]{--code-bg:#272822;--code-text:#f8f8f2}html[data-code-theme=github-light]{--code-bg:#f6f8fa;--code-text:#24292e}html[data-code-theme=github-dark]{--code-bg:#0d1117;--code-text:#c9d1d9}html[data-font-size=small]{--font-base:14px}html[data-font-size=large]{--font-base:18px}html[data-font-size=extra-large]{--font-base:20px}*{margin:0;padding:0;box-sizing:border-box}html{scroll-behavior:smooth;font-size:var(--font-base)}body{font-family:'Segoe UI',Tahoma,Geneva,Verdana,sans-serif;line-height:1.6;color:var(--text-dark);background:var(--bg-light);min-height:100vh;display:flex;flex-direction:column;transition:background-color .3s ease,color .3s ease}nav{background:linear-gradient(135deg,var(--primary-color) 0,var(--primary-dark) 100%);padding:0;position:sticky;top:0;z-index:1000;box-shadow:0 4px 15px rgba(0,0,0,.2);display:flex;justify-content:space-between;align-items:center;gap:10px;transition:all .3s ease}nav ul{list-style:none;display:flex;justify-content:center;flex-wrap:wrap;max-width:1400px;margin:0;flex:1;transition:all .3s ease}nav li{display:inline-block}nav a{color:#fff;text-decoration:none;padding:16px 20px;display:block;transition:all .3s ease;font-weight:500;position:relative;font-size:.8125rem}nav a::after{content:'';position:absolute;bottom:0;left:50%;width:0;height:3px;background:var(--accent-color);transition:all .3s ease;transform:translateX(-50%)}nav a:hover{background-color:rgba(255,255,255,.1);padding-bottom:13px}nav a:hover::after{width:80%}.nav-controls{display:flex;gap:10px;align-items:center;padding:0 15px;flex-shrink:0}.hamburger-btn{display:none;flex-direction:column;gap:6px;cursor:pointer;background:0 0;border:none;padding:8px;color:#fff;z-index:1001}.hamburger-line{width:25px;height:2.5px;background:#fff;border-radius:2px;transition:all .3s ease}.hamburger-btn.active .hamburger-line:first-child{transform:rotate(45deg) translate(9px,8px)}.hamburger-btn.active .hamburger-line:nth-child(2){opacity:0}.hamburger-btn.active .hamburger-line:nth-child(3){transform:rotate(-45deg) translate(8px,-7px)}.settings-btn{background:0 0;border:none;color:#fff;font-size:1.5rem;cursor:pointer;padding:8px 12px;transition:all .3s ease;border-radius:50%;width:40px;height:40px;display:flex;align-items:center;justify-content:center}.settings-btn:hover{background-color:rgba(255,255,255,.2);transform:rotate(20deg)}.header{background:linear-gradient(135deg,var(--primary-color) 0,var(--primary-dark) 50%,var(--primary-light) 100%);color:#fff;padding:50px 20px;text-align:center;position:relative;overflow:hidden;min-height:auto;transition:background .3s ease}.header::before{content:'';position:absolute;width:500px;height:500px;background:rgba(255,255,255,.05);border-radius:50%;top:-250px;right:-250px}.header h1{font-size:2.625rem;font-weight:700;margin-bottom:15px;position:relative;z-index:1;text-shadow:2px 2px 4px rgba(0,0,0,.3);word-wrap:break-word}.header p{font-size:1.125rem;opacity:.95;position:relative;z-index:1;word-wrap:break-word}.container{max-width:1400px;margin:40px auto;padding:0 20px;width:100%;flex-grow:1;transition:all .3s ease}.menu-section{background:var(--bg-white);padding:30px;border-radius:12px;box-shadow:0 4px 15px rgba(0,0,0,.08);margin-bottom:40px;transition:all .3s ease}.menu-section h2{color:var(--primary-color);margin-bottom:20px;font-size:1.5rem;border-bottom:3px solid var(--accent-color);padding-bottom:10px;word-wrap:break-word;transition:color .3s ease}.menu-section h3{color:var(--primary-color);margin-top:20px;margin-bottom:10px;font-size:1.125rem;transition:color .3s ease}.menu-section p{color:var(--text-light);line-height:1.8;margin-bottom:15px;word-wrap:break-word;transition:color .3s ease}.menu-links{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:15px}.menu-links a{background:linear-gradient(135deg,var(--accent-orange-dark) 0,var(--accent-orange) 100%);color:#fff;padding:18px;border-radius:8px;text-decoration:none;transition:all .3s ease;font-weight:600;text-align:center;box-shadow:0 2px 8px rgba(0,0,0,.1);font-size:.875rem;word-wrap:break-word}.menu-links a:active,.menu-links a:hover{transform:translateY(-5px);box-shadow:0 8px 20px rgba(245,101,10,.4)}.tabs{display:flex;gap:10px;margin-bottom:30px;flex-wrap:wrap;border-bottom:2px solid var(--border-color)}.tab-btn{background:0 0;border:none;padding:12px 20px;cursor:pointer;font-weight:600;color:var(--text-light);border-bottom:3px solid transparent;transition:all .3s ease;font-size:.9375rem}.tab-btn.active{color:var(--primary-color);border-bottom-color:var(--accent-color)}.tab-btn:hover{color:var(--primary-color)}.tab-content{display:none}.tab-content.active{display:block}.tutorial-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:25px;margin-top:30px}.tutorial-card{background:var(--bg-white);border-radius:12px;overflow:hidden;box-shadow:0 4px 15px rgba(0,0,0,.08);transition:all .3s ease;border-left:5px solid var(--primary-light);display:flex;flex-direction:column}.tutorial-card:hover{transform:translateY(-8px);box-shadow:0 12px 30px rgba(0,0,0,.15)}.tutorial-header{background:linear-gradient(135deg,var(--primary-color) 0,var(--accent-orange-dark) 100%);color:#fff;padding:20px;text-align:center;flex-shrink:0;transition:background .3s ease}.tutorial-header h3{font-size:1.25rem;margin-bottom:5px;color:#fff}.tutorial-level{font-size:.75rem;opacity:.9;background:rgba(255,255,255,.2);padding:4px 12px;border-radius:15px;display:inline-block}.tutorial-content{padding:25px;flex-grow:1;display:flex;flex-direction:column}.tutorial-content h4{color:var(--primary-color);font-weight:700;margin:15px 0 10px 0;font-size:.9375rem;transition:color .3s ease}.tutorial-content p{color:var(--text-light);margin-bottom:12px;line-height:1.7;font-size:.875rem;transition:color .3s ease}.code-block{background:var(--code-bg);color:var(--code-text);padding:15px;border-radius:6px;margin:15px 0;overflow-x:auto;font-family:'Courier New',monospace;font-size:.8125rem;line-height:1.5;position:relative;word-wrap:break-word;-webkit-overflow-scrolling:touch;transition:all .3s ease}.code-block code{color:var(--code-text)}.copy-btn{position:absolute;top:10px;right:10px;background:var(--accent-color);color:var(--text-dark);border:none;padding:6px 12px;border-radius:4px;cursor:pointer;font-size:.75rem;font-weight:600;transition:all .3s ease;z-index:10}.copy-btn:hover{background:gold;transform:scale(1.05)}.features-list{list-style:none;margin-top:15px;padding:0}.features-list li{padding:10px 0;padding-left:25px;position:relative;color:var(--text-light);font-size:.875rem;word-wrap:break-word;transition:color .3s ease}.features-list li::before{content:'✓';position:absolute;left:0;color:var(--accent-color);font-weight:700;font-size:1rem}a{color:#fc0;text-decoration:none}.tip-box{background:#f0f7ff;border-left:4px solid #2196f3;padding:15px;margin:20px 0;border-radius:4px;transition:all .3s ease}.tip-box strong{color:var(--primary-color)}.warning-box{background:#fff3cd;border-left:4px solid #ff9800;padding:15px;margin:20px 0;border-radius:4px;transition:all .3s ease}.warning-box strong{color:var(--primary-color)}html[data-theme=dark] .tip-box{background:#1a3a52}html[data-theme=dark] .warning-box{background:#332900}.preview-card{background:var(--bg-white);padding:25px;border-radius:12px;box-shadow:0 4px 15px rgba(0,0,0,.08);margin-bottom:25px;border-left:5px solid #ff6b6b;transition:all .3s ease}.preview-card h3{color:var(--primary-color);margin-bottom:15px;font-size:1.125rem;transition:color .3s ease}.preview-section{margin-bottom:20px}.preview-section strong{color:var(--primary-color);display:block;margin-bottom:10px;font-size:.9375rem;transition:color .3s ease}.preview-section p{color:var(--text-light);margin-bottom:10px;line-height:1.7;transition:color .3s ease}.playground-container{display:grid;grid-template-columns:1fr 1fr;gap:25px;margin-top:30px}.playground-panel{background:var(--bg-white);border-radius:12px;overflow:hidden;box-shadow:0 20px 20px rgba(0,0,0,.08);display:flex;flex-direction:column;min-height:500px}.playground-header{background:linear-gradient(135deg,var(--primary-color) 0,var(--accent-orange-dark) 100%);color:#fff;padding:15px 20px;font-weight:600;display:flex;justify-content:space-between;align-items:center;flex-shrink:0;transition:background .3s ease}.playground-header button{background:var(--accent-color);color:var(--text-dark);border:none;padding:8px 16px;border-radius:4px;cursor:pointer;font-weight:600;font-size:.8125rem;transition:all .3s ease}.playground-header button:hover{background:gold;transform:scale(1.05)}.editor{background:var(--code-bg);color:var(--code-text);padding:20px;font-family:'Courier New',monospace;font-size:.8125rem;line-height:1.5;flex-grow:1;overflow-y:auto;-webkit-overflow-scrolling:touch}.editor textarea{background:var(--code-bg);color:var(--code-text);border:none;width:100%;height:100%;font-family:'Courier New',monospace;font-size:.8125rem;line-height:1.5;padding:0;resize:none}.preview-output{background:var(--bg-light);padding:20px;font-family:'Courier New',monospace;font-size:.8125rem;flex-grow:1;overflow-y:auto;border-top:1px solid var(--border-color);-webkit-overflow-scrolling:touch;color:var(--text-dark);white-space:pre-wrap;word-wrap:break-word}.settings-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:rgba(0,0,0,.6);display:none;z-index:1999;animation:fadeIn .3s ease}.settings-overlay.active{display:block}.settings-panel{position:fixed;right:0;top:0;width:100%;max-width:400px;height:100vh;background:var(--bg-white);box-shadow:-4px 0 20px rgba(0,0,0,.3);overflow-y:auto;z-index:2000;transform:translateX(100%);transition:transform .3s ease;display:flex;flex-direction:column;-webkit-overflow-scrolling:touch}.settings-panel.active{transform:translateX(0)}.settings-header{background:linear-gradient(135deg,var(--primary-color) 0,var(--primary-dark) 100%);color:#fff;padding:20px;display:flex;justify-content:space-between;align-items:center;flex-shrink:0;transition:background .3s ease}.settings-header h2{margin:0;font-size:1.25rem;color:#fff}.close-settings{background:0 0;border:none;color:#fff;font-size:1.5rem;cursor:pointer;padding:0;width:30px;height:30px;display:flex;align-items:center;justify-content:center;transition:all .3s ease}.close-settings:hover{transform:rotate(90deg)}.settings-content{padding:20px;flex-grow:1}.settings-group{margin-bottom:25px}.settings-group label{display:block;margin-bottom:10px;font-weight:600;color:var(--text-dark);font-size:.9375rem;transition:color .3s ease}.settings-group select{width:100%;padding:10px;border:2px solid var(--border-color);border-radius:6px;background:var(--bg-light);color:var(--text-dark);font-size:.9375rem;cursor:pointer;transition:all .3s ease}.settings-group select:focus{outline:0;border-color:var(--primary-color);box-shadow:0 0 0 3px rgba(26,35,126,.1)}.toggle-group{display:flex;align-items:center;gap:15px}.toggle-switch{position:relative;width:50px;height:28px;background-color:#ccc;border-radius:14px;cursor:pointer;transition:background-color .3s ease}.toggle-switch.active{background-color:var(--accent-color)}.toggle-switch::after{content:'';position:absolute;width:24px;height:24px;background-color:#fff;border-radius:50%;top:2px;left:2px;transition:left .3s ease}.toggle-switch.active::after{left:24px}.font-size-options{display:flex;gap:10px;flex-wrap:wrap}.font-size-btn{flex:1;min-width:60px;padding:10px;border:2px solid var(--border-color);border-radius:6px;background:var(--bg-light);color:var(--text-dark);cursor:pointer;font-weight:600;transition:all .3s ease;font-size:.875rem}.font-size-btn.active{background:var(--primary-color);color:#fff;border-color:var(--primary-color)}.font-size-btn:hover{border-color:var(--primary-color)}.color-palette{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.color-option{width:100%;aspect-ratio:1;border-radius:8px;border:3px solid transparent;cursor:pointer;transition:all .3s ease}.color-option:hover{transform:scale(1.05)}.color-option.active{border-color:var(--text-dark);box-shadow:0 0 10px rgba(0,0,0,.2)}.code-theme-options{display:grid;grid-template-columns:repeat(auto-fit,minmax(100px,1fr));gap:10px}.theme-btn{padding:12px;border:2px solid var(--border-color);border-radius:6px;background:var(--bg-light);color:var(--text-dark);cursor:pointer;font-weight:600;transition:all .3s ease;font-size:.875rem}.theme-btn.active{background:var(--primary-color);color:#fff;border-color:var(--primary-color)}.theme-btn:hover{border-color:var(--primary-color)}.settings-footer{padding:20px;border-top:2px solid var(--border-color);flex-shrink:0}.reset-btn{width:100%;padding:12px;background:#ff6b6b;color:#fff;border:none;border-radius:6px;font-weight:600;cursor:pointer;transition:all .3s ease;font-size:.9375rem}.reset-btn:hover{background:#ff5252;transform:translateY(-2px)}@keyframes fadeIn{from{opacity:0}to{opacity:1}}footer{background:var(--primary-color);color:#fff;text-align:center;padding:30px 20px;margin-top:60px;transition:background .3s ease}footer p{margin:5px 0;word-wrap:break-word;font-size:.9375rem}footer a{color:var(--accent-color);text-decoration:none}footer a:hover{text-decoration:underline}@media (max-width:768px){nav{flex-direction:row;padding:0 15px;gap:0}nav ul{display:none;flex-direction:column;position:fixed;top:60px;left:0;right:0;width:100%;background:linear-gradient(135deg,var(--primary-color) 0,var(--primary-dark) 100%);max-width:none;flex:none;border-top:1px solid rgba(255,255,255,.1);box-shadow:0 4px 15px rgba(0,0,0,.2);z-index:999}nav ul.active{display:flex}nav li{width:100%}nav a{text-align:left;padding:14px 20px;border-bottom:1px solid rgba(255,255,255,.05);font-size:.8125rem}.hamburger-btn{display:flex;flex-shrink:0}.header{padding:40px 20px}.header h1{font-size:1.75rem;margin-bottom:12px}.header p{font-size:.9375rem}.container{padding:0 15px;margin:25px auto}.menu-section{padding:20px}.menu-section h2{font-size:1.25rem}.tutorial-grid{grid-template-columns:1fr}.menu-links{grid-template-columns:repeat(2,1fr);gap:12px}.tabs{flex-direction:column}.tab-btn{text-align:left;border-bottom:none;border-left:3px solid transparent;padding:12px 20px}.tab-btn.active{border-left-color:var(--accent-color);border-bottom:none}.playground-container{grid-template-columns:1fr;gap:15px}.playground-panel{min-height:400px}.settings-panel{max-width:100%}.code-block{font-size:.75rem}.copy-btn{padding:5px 10px;font-size:.7rem}}@media (max-width:480px){nav{padding:0 12px}nav a{padding:12px 16px;font-size:.75rem}.hamburger-btn{padding:6px}.hamburger-line{width:22px;height:2px}.settings-btn{width:36px;height:36px;font-size:1.25rem}.header h1{font-size:1.375rem;text-shadow:1px 1px 3px rgba(0,0,0,.4)}.header p{font-size:.8125rem}.container{padding:0 10px}.menu-section{padding:15px}.menu-links{grid-template-columns:1fr;gap:10px}.menu-links a{padding:12px;font-size:.75rem}.tutorial-grid{gap:15px}.code-block{font-size:.7rem;padding:12px}.playground-panel{min-height:300px}.color-palette{grid-template-columns:repeat(2,1fr)}.settings-content{padding:15px}}@media (max-width:320px){.header h1{font-size:1.125rem}.menu-section{padding:12px}}@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}@media print{.hamburger-btn,.settings-btn,.settings-overlay,.settings-panel,footer,nav{display:none}.header{page-break-after:avoid}.menu-section{page-break-inside:avoid}}