:root{--theme:light;--bg-primary:#ffffff;--bg-secondary:#f9fafb;--bg-tertiary:#f3f4f6;--text-primary:#111827;--text-secondary:#6b7280;--text-tertiary:#9ca3af;--border-color:#e5e7eb;--border-light:#f3f4f6;--shadow-xs:0 1px 2px 0 rgba(0,0,0,0.05);--shadow-sm:0 1px 3px 0 rgba(0,0,0,0.1),0 1px 2px 0 rgba(0,0,0,0.06);--shadow-md:0 4px 6px -1px rgba(0,0,0,0.1),0 2px 4px -1px rgba(0,0,0,0.06);--shadow-lg:0 10px 15px -3px rgba(0,0,0,0.1),0 4px 6px -2px rgba(0,0,0,0.05);--shadow-xl:0 20px 25px -5px rgba(0,0,0,0.1),0 10px 10px -5px rgba(0,0,0,0.04);--accent-primary:#667eea;--accent-primary-light:#7c8ff9;--accent-primary-dark:#5568d3;--accent-secondary:#764ba2;--accent-success:#10b981;--accent-warning:#f59e0b;--accent-error:#ef4444;--accent-info:#3b82f6}html.dark-mode{--theme:dark;--bg-primary:#0f172a;--bg-secondary:#1e293b;--bg-tertiary:#334155;--text-primary:#f8fafc;--text-secondary:#cbd5e1;--text-tertiary:#94a3b8;--border-color:#475569;--border-light:#1e293b;--shadow-xs:0 1px 2px 0 rgba(0,0,0,0.3);--shadow-sm:0 1px 3px 0 rgba(0,0,0,0.4),0 1px 2px 0 rgba(0,0,0,0.3);--shadow-md:0 4px 6px -1px rgba(0,0,0,0.4),0 2px 4px -1px rgba(0,0,0,0.3);--shadow-lg:0 10px 15px -3px rgba(0,0,0,0.4),0 4px 6px -2px rgba(0,0,0,0.3);--shadow-xl:0 20px 25px -5px rgba(0,0,0,0.4),0 10px 10px -5px rgba(0,0,0,0.3);--accent-primary:#818cf8;--accent-primary-light:#a5b4fc;--accent-primary-dark:#6366f1;--accent-secondary:#c084fc;--accent-success:#34d399;--accent-warning:#fbbf24;--accent-error:#f87171;--accent-info:#60a5fa}*{transition:background-color 0.3s ease,color 0.3s ease,border-color 0.3s ease,box-shadow 0.3s ease !important}html.dark-mode{background-color:var(--bg-primary);color:var(--text-primary)}html.dark-mode body{background-color:var(--bg-primary);color:var(--text-primary)}html.dark-mode header{background-color:var(--bg-secondary);border-color:var(--border-color);box-shadow:var(--shadow-md)}html.dark-mode nav{background-color:var(--bg-secondary)}html.dark-mode header a:not(.btn){color:var(--text-primary);text-decoration:none}html.dark-mode header a:hover{color:var(--accent-primary)}html.dark-mode .nav-link{color:var(--text-primary)}html.dark-mode .nav-link:hover{color:var(--accent-primary)}html.dark-mode .nav-link::after{background:linear-gradient(135deg,var(--accent-primary) 0%,var(--accent-secondary) 100%)}html.dark-mode #mobileMenu{background-color:var(--bg-secondary);border-color:var(--border-color);box-shadow:var(--shadow-lg)}html.dark-mode #mobileMenu a{color:var(--text-primary);border-color:var(--border-color)}html.dark-mode #mobileMenu a:hover{background-color:var(--bg-tertiary);color:var(--accent-primary)}html.dark-mode footer{background:linear-gradient(135deg,#0f172a 0%,#1e293b 100%);border-color:var(--border-color);color:var(--text-primary)}html.dark-mode footer a{color:var(--accent-primary)}html.dark-mode footer a:hover{color:var(--accent-primary-light)}html.dark-mode .card,html.dark-mode [class*="card"],html.dark-mode .container{background-color:var(--bg-secondary);color:var(--text-primary);border-color:var(--border-color)}html.dark-mode [class*="service-card"],html.dark-mode [class*="calculator-directory-card"]{background-color:var(--bg-secondary);color:var(--text-primary);border-color:var(--border-color);box-shadow:var(--shadow-md)}html.dark-mode [class*="service-card"]:hover,html.dark-mode [class*="calculator-directory-card"]:hover{background-color:var(--bg-tertiary);border-color:var(--accent-primary);box-shadow:var(--shadow-lg),0 0 20px rgba(102,126,234,0.2)}html.dark-mode .calc-sidebar{background-color:var(--bg-secondary);border-right-color:var(--border-color)}html.dark-mode .sidebar-header{background-color:var(--bg-secondary);border-bottom-color:var(--border-color)}html.dark-mode .sidebar-title{color:var(--accent-primary-light)}html.dark-mode .sidebar-close{color:var(--text-tertiary)}html.dark-mode .sidebar-close:hover{color:var(--accent-primary);background-color:var(--bg-tertiary)}html.dark-mode .sidebar-group-label{color:var(--text-tertiary)}html.dark-mode .sidebar-tab{color:var(--text-secondary)}html.dark-mode .sidebar-tab:hover:not(.active){background-color:var(--bg-tertiary);color:var(--accent-primary-light)}html.dark-mode .sidebar-tab.active{background:linear-gradient(135deg,var(--accent-primary) 0%,var(--accent-secondary) 100%);color:#fff}html.dark-mode input,html.dark-mode textarea,html.dark-mode select,html.dark-mode [type="text"],html.dark-mode [type="email"],html.dark-mode [type="password"],html.dark-mode [type="number"],html.dark-mode [type="date"]{background-color:var(--bg-tertiary);color:var(--text-primary);border-color:var(--border-color);box-shadow:var(--shadow-sm)}html.dark-mode input:focus,html.dark-mode textarea:focus,html.dark-mode select:focus{background-color:var(--bg-tertiary);color:var(--text-primary);border-color:var(--accent-primary);outline:none;box-shadow:0 0 0 3px rgba(102,126,234,0.2)}html.dark-mode input::placeholder{color:var(--text-tertiary)}html.dark-mode .btn-primary{background:linear-gradient(135deg,var(--accent-primary) 0%,var(--accent-secondary) 100%);color:white;border:none;box-shadow:var(--shadow-md)}html.dark-mode .btn-primary:hover{box-shadow:var(--shadow-lg),0 0 20px rgba(102,126,234,0.3);transform:translateY(-2px)}html.dark-mode .btn-secondary{background-color:transparent;color:var(--text-primary);border:2px solid var(--border-color)}html.dark-mode .btn-secondary:hover{background-color:var(--bg-tertiary);border-color:var(--accent-primary);color:var(--accent-primary)}html.dark-mode .btn-white{background-color:var(--bg-tertiary);color:var(--text-primary);border:1px solid var(--border-color)}html.dark-mode .btn-white:hover{background-color:var(--bg-tertiary);color:var(--accent-primary);border-color:var(--accent-primary)}html.dark-mode button:not([class*="primary"]):not([class*="secondary"]):not([class*="white"]){background-color:var(--bg-tertiary);color:var(--text-primary);border-color:var(--border-color)}html.dark-mode button:not([class*="primary"]):not([class*="secondary"]):not([class*="white"]):hover{background-color:var(--bg-tertiary);color:var(--accent-primary);border-color:var(--accent-primary)}.theme-toggle-btn{background-color:transparent;border:2px solid var(--text-tertiary);cursor:pointer;padding:0.5rem;display:flex;align-items:center;justify-content:center;color:var(--text-primary);transition:all 0.3s cubic-bezier(0.43,0.13,0.23,0.96);border-radius:0.5rem;width:2.5rem;height:2.5rem;margin:0 0.5rem;position:relative;overflow:hidden}.theme-toggle-btn:hover{color:var(--accent-primary);background-color:var(--bg-secondary);border-color:var(--accent-primary);transform:scale(1.08);box-shadow:0 0 16px rgba(102,126,234,0.2)}.theme-toggle-btn:active{transform:scale(0.95)}.theme-toggle-btn svg{width:1.25rem;height:1.25rem;transition:transform 0.3s cubic-bezier(0.43,0.13,0.23,0.96)}.theme-toggle-btn .moon-icon{display:none}html.dark-mode .theme-toggle-btn .sun-icon{display:none;transform:rotate(-180deg)}html.dark-mode .theme-toggle-btn .moon-icon{display:block;transform:rotate(-180deg)}.toggle-ripple{position:absolute;border-radius:50%;background:rgba(102,126,234,0.6);width:4px;height:4px;pointer-events:none}.toggle-ripple.ripple-active{animation:ripple-expand 0.6s cubic-bezier(0.4,0,0.2,1) forwards}@keyframes ripple-expand{0%{width:4px;height:4px;opacity:1}100%{width:100px;height:100px;opacity:0}}html.theme-transitioning{transition:background-color 0.6s cubic-bezier(0.43,0.13,0.23,0.96)}html.theme-transitioning body{transition:background-color 0.6s cubic-bezier(0.43,0.13,0.23,0.96),color 0.6s cubic-bezier(0.43,0.13,0.23,0.96)}html.theme-transitioning *{transition:background-color 0.6s cubic-bezier(0.43,0.13,0.23,0.96),color 0.6s cubic-bezier(0.43,0.13,0.23,0.96),border-color 0.6s cubic-bezier(0.43,0.13,0.23,0.96),box-shadow 0.6s cubic-bezier(0.43,0.13,0.23,0.96) !important}@media (max-width:768px){html.dark-mode .section-title{color:var(--text-primary)}html.dark-mode .theme-toggle-btn{width:2.25rem;height:2.25rem;margin:0 0.25rem}html.dark-mode .theme-toggle-btn svg{width:1.1rem;height:1.1rem}}@media print{html.dark-mode{--bg-primary:#ffffff;--text-primary:#000000}}