:root{--bg-color:#f5f5f5;--text-color:#333;--container-bg:white;--header-bg:#4a90e2;--header-text:white;--tab-bg:#e8e8e8;--tab-active-bg:white;--tab-border:#ccc;--toolbar-bg:#f9f9f9;--toolbar-border:#ddd;--button-bg:#fff;--button-border:#ccc;--button-hover:#e8e8e8;--button-active:#d0d0d0;--input-bg:white;--input-text:#333;--notification-success:#27ae60;--notification-error:#e74c3c}body.dark-mode{--bg-color:#1e1e1e;--text-color:#e0e0e0;--container-bg:#2d2d2d;--header-bg:#1a1a1a;--header-text:#e0e0e0;--tab-bg:#333;--tab-active-bg:#2d2d2d;--tab-border:#444;--toolbar-bg:#333;--toolbar-border:#444;--button-bg:#444;--button-border:#555;--button-hover:#555;--button-active:#666;--input-bg:#2d2d2d;--input-text:#e0e0e0}*{margin:0;padding:0;box-sizing:border-box}.point strong,body{color:var(--text-color)}body{font-family:Arial,sans-serif;background-color:var(--bg-color);transition:background-color .3s,color .3s}.container{max-width:1800px;margin:0 auto;background-color:var(--container-bg);min-height:100vh;transition:background-color .3s}#darkModeToggle,header{color:var(--header-text);display:flex;align-items:center}header{background-color:var(--header-bg);padding:20px;justify-content:space-between}header h1{font-size:22px;font-weight:400}.intro-section{background:linear-gradient(135deg,#f8f9fa 0,#e9ecef 100%);padding:40px 20px;margin:0;border-bottom:3px solid #4a90e2}body.dark-mode .intro-section{background:linear-gradient(135deg,#2d2d2d 0,#1e1e1e 100%);border-bottom-color:#64b5f6}.intro-section h2{text-align:center;color:#4a90e2;font-size:26px;margin-bottom:15px;font-weight:600}body.dark-mode .content-section li strong,body.dark-mode .faq-item h3,body.dark-mode .feature-item h3,body.dark-mode .intro-section h2{color:#64b5f6}.intro-section>p,.point p{line-height:1.6;color:var(--text-color)}.intro-section>p{text-align:center;max-width:800px;margin:0 auto 30px;font-size:16px}.key-points{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:20px;max-width:1200px;margin:0 auto}.point{background-color:var(--container-bg);padding:20px;border-radius:8px;border:1px solid var(--toolbar-border);box-shadow:0 2px 8px rgba(0,0,0,.05);transition:transform .2s,box-shadow .2s}.point:hover{transform:translateY(-3px);box-shadow:0 4px 12px rgba(74,144,226,.15)}.point strong{display:block;font-size:16px;margin-bottom:8px}.point p{margin:0;font-size:14px;opacity:.9}.header-controls{display:flex;align-items:center;gap:15px}.about-link{text-decoration:none}#darkModeToggle{background:0 0;border:0;padding:5px;cursor:pointer;justify-content:center}#darkModeToggle:hover{background-color:rgba(255,255,255,.1);border-radius:50%}.sun-icon{display:none}.moon-icon,body.dark-mode .sun-icon{display:block}body.dark-mode .moon-icon{display:none}.tabs{display:flex;background-color:var(--tab-bg);border-bottom:1px solid var(--tab-border)}.tab-button,.toolbar button{cursor:pointer;color:var(--text-color)}.tab-button{padding:10px 20px;background-color:var(--tab-bg);border:0;border-right:1px solid var(--tab-border);font-size:14px;transition:background-color .2s}.tab-button:hover,.toolbar button:hover{background-color:var(--button-hover)}.tab-button.active{background-color:var(--tab-active-bg);border-bottom:1px solid var(--tab-active-bg)}.toolbar{display:flex;gap:5px;padding:10px;background-color:var(--toolbar-bg);border-bottom:1px solid var(--toolbar-border);flex-wrap:wrap}.toolbar button{padding:8px 15px;background-color:var(--button-bg);border:1px solid var(--button-border);border-radius:3px;font-size:13px;transition:all .2s}.toolbar button:hover{border-color:#999}.toolbar button:active{background-color:var(--button-active)}.content-area{position:relative;height:calc(100vh - 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