:root{--color-primary-50: #f0f9ff;--color-primary-100: #e0f2fe;--color-primary-200: #bae6fd;--color-primary-300: #7dd3fc;--color-primary-400: #38bdf8;--color-primary-500: #0ea5e9;--color-primary-600: #0284c7;--color-primary-700: #0369a1;--color-primary-800: #075985;--color-primary-900: #0c4a6e;--color-secondary-50: #f0fdfa;--color-secondary-100: #ccfbf1;--color-secondary-200: #99f6e4;--color-secondary-300: #5eead4;--color-secondary-400: #2dd4bf;--color-secondary-500: #14b8a6;--color-secondary-600: #0d9488;--color-secondary-700: #0f766e;--color-accent-50: #fef3c7;--color-accent-100: #fde68a;--color-accent-400: #fbbf24;--color-accent-500: #f59e0b;--color-accent-600: #d97706;--color-success-50: #f0fdf4;--color-success-100: #dcfce7;--color-success-400: #4ade80;--color-success-500: #22c55e;--color-success-600: #16a34a;--color-warning-50: #fff7ed;--color-warning-100: #ffedd5;--color-warning-500: #f97316;--color-error-50: #fef2f2;--color-error-100: #fee2e2;--color-error-500: #ef4444;--color-error-600: #dc2626;--color-gray-50: #f8fafc;--color-gray-100: #f1f5f9;--color-gray-200: #e2e8f0;--color-gray-300: #cbd5e1;--color-gray-400: #94a3b8;--color-gray-500: #64748b;--color-gray-600: #475569;--color-gray-700: #334155;--color-gray-800: #1e293b;--color-gray-900: #0f172a;--gradient-primary: linear-gradient(135deg, #0ea5e9 0%, #0284c7 50%, #0369a1 100%);--gradient-secondary: linear-gradient(135deg, #14b8a6 0%, #0d9488 100%);--gradient-accent: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);--gradient-success: linear-gradient(135deg, #22c55e 0%, #16a34a 100%);--gradient-mesh: radial-gradient(at 0% 0%, rgba(14, 165, 233, .1) 0px, transparent 50%), radial-gradient(at 100% 0%, rgba(20, 184, 166, .1) 0px, transparent 50%), radial-gradient(at 100% 100%, rgba(14, 165, 233, .05) 0px, transparent 50%), radial-gradient(at 0% 100%, rgba(20, 184, 166, .05) 0px, transparent 50%);--space-1: .25rem;--space-2: .5rem;--space-3: .75rem;--space-4: 1rem;--space-5: 1.25rem;--space-6: 1.5rem;--space-8: 2rem;--space-10: 2.5rem;--space-12: 3rem;--space-16: 4rem;--font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;--radius-sm: .375rem;--radius-md: .625rem;--radius-lg: 1rem;--radius-xl: 1.5rem;--radius-2xl: 2rem;--radius-full: 9999px;--shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, .05);--shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, .1), 0 1px 2px -1px rgba(0, 0, 0, .1);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .1), 0 2px 4px -2px rgba(0, 0, 0, .1);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .1), 0 4px 6px -4px rgba(0, 0, 0, .1);--shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, .1), 0 8px 10px -6px rgba(0, 0, 0, .1);--shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, .25);--shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, .05);--shadow-colored: 0 10px 25px -5px rgba(14, 165, 233, .2), 0 8px 10px -6px rgba(14, 165, 233, .1);--shadow-glow: 0 0 20px rgba(14, 165, 233, .3);--glass-bg: rgba(255, 255, 255, .7);--glass-border: rgba(255, 255, 255, .3);--glass-blur: blur(12px);--glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, .15);--transition-fast: .15s cubic-bezier(.4, 0, .2, 1);--transition-normal: .25s cubic-bezier(.4, 0, .2, 1);--transition-slow: .35s cubic-bezier(.4, 0, .2, 1);--transition-bounce: .5s cubic-bezier(.68, -.55, .265, 1.55);--transition-smooth: .4s cubic-bezier(.4, 0, .2, 1);--z-base: 1;--z-dropdown: 1025;--z-sticky: 1020;--z-fixed: 1030;--z-modal-backdrop: 1040;--z-modal: 1050;--z-popover: 1060;--z-tooltip: 1070}*{margin:0;padding:0;box-sizing:border-box}html{font-size:clamp(14px,1vw + 12px,16px);height:100%;scroll-behavior:smooth;overflow-x:hidden}body{font-family:var(--font-family);line-height:1.55;color:var(--color-gray-800);background:var(--color-gray-50);min-height:100%;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;-webkit-tap-highlight-color:rgba(14,165,233,.2);padding:0;margin:0;width:100%;overflow-x:hidden;overscroll-behavior-x:none;max-width:100vw}#app{display:flex;flex-direction:column;min-height:100vh;overflow-x:hidden;max-width:100vw}.site-header{background:#0ea5e9d9;color:#fff;box-shadow:var(--shadow-lg);border-bottom:1px solid rgba(232,238,245,.3);position:sticky;top:0;z-index:var(--z-sticky);transition:transform .4s cubic-bezier(.4,0,.2,1),box-shadow .4s cubic-bezier(.4,0,.2,1),background .4s cubic-bezier(.4,0,.2,1),backdrop-filter .4s cubic-bezier(.4,0,.2,1);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);width:100%}.site-header.header-scrolled{padding:0;box-shadow:var(--shadow-xl);background:#0ea5e9e6;-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);border-bottom:1px solid rgba(232,238,245,.4)}.site-header.header-hidden{transform:translateY(-100%);box-shadow:none}.header-container{max-width:1200px;margin:0 auto;padding:var(--space-6) var(--space-4);display:flex;align-items:center;justify-content:space-between;transition:padding .4s cubic-bezier(.4,0,.2,1);min-height:72px}.site-header.header-scrolled .header-container{padding:var(--space-4) var(--space-4);min-height:64px}.brand{flex-shrink:0;min-width:0}.brand-link{display:flex;align-items:center;gap:var(--space-3);color:#fff;text-decoration:none;transition:opacity var(--transition-fast)}.brand-link:hover{opacity:.9}.brand-icon{font-size:2rem;line-height:1;transition:font-size .4s cubic-bezier(.4,0,.2,1),transform .4s cubic-bezier(.4,0,.2,1);flex-shrink:0}.site-header.header-scrolled .brand-icon{font-size:1.3rem}.brand-content{display:flex;flex-direction:column;gap:var(--space-1)}.brand-text{font-size:1.5rem;font-weight:700;letter-spacing:-.025em;line-height:1.2;transition:font-size .4s cubic-bezier(.4,0,.2,1),transform .4s cubic-bezier(.4,0,.2,1);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.site-header.header-scrolled .brand-text{font-size:1.25rem}.brand-tagline{font-size:.875rem;font-weight:400;opacity:.95;line-height:1.3;transition:font-size .4s cubic-bezier(.4,0,.2,1),opacity .4s cubic-bezier(.4,0,.2,1),max-height .4s cubic-bezier(.4,0,.2,1),transform .4s cubic-bezier(.4,0,.2,1);max-height:50px;overflow:hidden}.site-header.header-scrolled .brand-tagline{font-size:.75rem;opacity:.75;max-height:20px}.menu-toggle{display:none;background:none;border:none;cursor:pointer;padding:var(--space-2);z-index:1001}.hamburger{display:block;width:24px;height:2px;background-color:#fff;position:relative;transition:background-color var(--transition-normal)}.hamburger:before,.hamburger:after{content:"";position:absolute;width:24px;height:2px;background-color:#fff;transition:transform var(--transition-normal)}.hamburger:before{top:-7px}.hamburger:after{bottom:-7px}.menu-toggle[aria-expanded=true] .hamburger{background-color:transparent}.menu-toggle[aria-expanded=true] .hamburger:before{transform:rotate(45deg) translate(5px,5px)}.menu-toggle[aria-expanded=true] .hamburger:after{transform:rotate(-45deg) translate(5px,-5px)}.main-nav{max-width:100%;display:flex;align-items:center}.nav-list{display:flex;align-items:center;gap:var(--space-1);list-style:none;margin:0;padding:0}.nav-item{position:relative}.nav-link{display:flex;align-items:center;gap:var(--space-1);padding:var(--space-2) var(--space-3);color:#fff;text-decoration:none;font-weight:500;border-radius:var(--radius-md);transition:background-color var(--transition-fast);background:none;border:none;cursor:pointer;font-size:.9375rem;font-family:var(--font-family);white-space:nowrap}.nav-link:hover{background-color:#ffffff1a}.dropdown-icon{transition:transform var(--transition-normal);flex-shrink:0}.dropdown-trigger[aria-expanded=true] .dropdown-icon{transform:rotate(180deg)}.nav-cta{display:inline-flex;align-items:center;padding:var(--space-2) var(--space-5);background:#ffffff26;color:#fff;text-decoration:none;font-weight:600;border-radius:var(--radius-full);transition:all var(--transition-normal);border:1px solid rgba(255,255,255,.2);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);box-shadow:var(--shadow-sm)}.nav-cta:hover{background:#ffffff40;transform:translateY(-1px);box-shadow:var(--shadow-md)}.mega-dropdown{position:absolute;top:100%;left:50%;transform:translate(-50%) translateY(-8px);margin-top:var(--space-4);background:#fff;border-radius:var(--radius-xl);box-shadow:var(--shadow-2xl);padding:var(--space-3);width:auto;max-width:420px;max-height:70vh;overflow-y:auto;opacity:0;visibility:hidden;transition:opacity var(--transition-smooth),visibility var(--transition-smooth),transform var(--transition-smooth);z-index:var(--z-dropdown);border:1px solid var(--color-gray-200);box-sizing:border-box}.nav-item.has-dropdown.is-open .mega-dropdown,.nav-item.is-open .mega-dropdown,.dropdown-trigger[aria-expanded=true]+.mega-dropdown{opacity:1!important;visibility:visible!important;margin-top:var(--space-2);max-height:none!important;transform:translate(-50%) translateY(0)!important}.mega-dropdown-container{display:grid;grid-template-columns:repeat(2,1fr);gap:var(--space-3)}.mega-dropdown-column{display:flex;flex-direction:column}.dropdown-heading{font-size:.875rem;font-weight:600;color:var(--color-gray-900);margin-bottom:var(--space-2);text-transform:uppercase;letter-spacing:.05em}.dropdown-links{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:var(--space-1)}.dropdown-link{display:block;padding:var(--space-1) var(--space-2);color:var(--color-gray-700);text-decoration:none;font-size:.8125rem;border-radius:var(--radius-md);transition:all var(--transition-fast)}.dropdown-link:hover{background-color:var(--color-primary-50);color:var(--color-primary-700);transform:translate(var(--space-1))}.mega-dropdown-footer{grid-column:1 / -1;margin-top:var(--space-3);padding-top:var(--space-3);border-top:1px solid var(--color-gray-200);text-align:center}.mega-dropdown.curve-methods-dropdown{max-width:280px;left:50%;transform:translate(-50%) translateY(-8px)}.dropdown-all-link{display:inline-flex;align-items:center;padding:var(--space-2) var(--space-5);background:var(--gradient-primary);color:#fff;text-decoration:none;font-weight:600;border-radius:var(--radius-full);transition:all var(--transition-normal);box-shadow:var(--shadow-sm);font-size:.8125rem}.dropdown-all-link:hover{transform:translateY(-1px);box-shadow:var(--shadow-md),var(--shadow-colored)}h1{font-size:2.5rem;font-weight:700;margin-bottom:var(--space-2);letter-spacing:-.025em}.subtitle{font-size:1.1rem;font-weight:400;opacity:.9}main{flex:1;padding:var(--space-6) var(--space-4);width:100%;max-width:100vw;overflow-x:hidden}.hero-section{text-align:center;margin:var(--space-12) 0 var(--space-12) 0;padding:var(--space-8) var(--space-6);position:relative;background-color:#fff;border-radius:var(--radius-xl);box-shadow:0 4px 24px #00000014}.hero-section h1{background:var(--gradient-primary);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:var(--space-3);position:relative;z-index:2}.hero-section h1:before{content:"";position:absolute;top:-20px;left:50%;transform:translate(-50%);width:100%;max-width:600px;height:120%;background:radial-gradient(ellipse at center,rgba(14,165,233,.1) 0%,transparent 70%);z-index:-1;border-radius:50%}.hero-description{font-size:.95rem;color:var(--color-gray-600);line-height:1.5;max-width:650px;margin:0 auto;font-weight:400}.container{max-width:1200px;margin:0 auto;width:100%;overflow-x:hidden}.card{background:#ffffffe6;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-radius:var(--radius-xl);box-shadow:0 4px 16px #0000000d;padding:var(--space-6);margin-bottom:var(--space-6);border:1px solid rgba(255,255,255,.5);transition:all var(--transition-smooth);position:relative;overflow:hidden;width:100%;max-width:100%;box-sizing:border-box}.card:before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:var(--gradient-primary);opacity:0;transition:opacity var(--transition-normal)}.card:hover{box-shadow:var(--shadow-xl);transform:translateY(-2px)}.card:hover:before{opacity:1}h2{font-size:1.5rem;font-weight:600;margin-bottom:var(--space-4);color:var(--color-gray-800)}h3{font-size:1.25rem;font-weight:600;margin-bottom:var(--space-4);color:var(--color-gray-800)}.input-section .card h2,.info-section .card h2{text-align:center;font-size:1.4rem;margin-bottom:var(--space-3);letter-spacing:.025em}.similar-tools-section h3{text-align:center;font-size:1.2rem;margin-bottom:var(--space-3);letter-spacing:.025em}.advanced-section h2{text-align:center;font-size:1.4rem;margin-bottom:var(--space-3);letter-spacing:.025em}.helper-text{font-size:.875rem;color:var(--color-gray-600);margin-bottom:var(--space-2)}.example-text{font-size:.75rem;color:var(--color-gray-500);margin-top:var(--space-2);font-style:italic}.hidden{display:none!important}.input-section{margin-bottom:var(--space-8);width:100%;max-width:100%;overflow-x:hidden;box-sizing:border-box;background-color:var(--color-gray-100);padding:var(--space-4);border-radius:var(--radius-xl);box-shadow:var(--shadow-sm);margin-left:0;margin-right:0}.site-footer{background-color:var(--color-gray-800);color:var(--color-gray-200);padding:var(--space-10) var(--space-4) var(--space-6);margin-top:auto}.footer-container{max-width:1200px;margin:0 auto}.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:var(--space-8);margin-bottom:var(--space-8)}.footer-column{display:flex;flex-direction:column}.footer-heading{font-size:1rem;font-weight:600;color:#fff;margin-bottom:var(--space-4);letter-spacing:.025em}.footer-text{font-size:.875rem;line-height:1.6;color:var(--color-gray-300);margin:0}.footer-links{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:var(--space-2)}.footer-link{color:var(--color-gray-300);text-decoration:none;font-size:.875rem;transition:color var(--transition-fast);display:inline-block}.footer-link:hover{color:#fff}.footer-bottom{text-align:center;padding-top:var(--space-6);border-top:1px solid var(--color-gray-700);font-size:.875rem}.footer-bottom-links{display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:var(--space-2) var(--space-3);margin-bottom:var(--space-4)}.footer-bottom-link{color:var(--color-gray-400);text-decoration:none;transition:color var(--transition-fast);font-size:.875rem}.footer-bottom-link:hover{color:#fff}.footer-separator{color:var(--color-gray-600);-webkit-user-select:none;user-select:none}.footer-bottom p{margin:0;color:var(--color-gray-400)}@media (max-width: 639px){.method-list{grid-template-columns:1fr;gap:var(--space-4)}main{padding:var(--space-4) 0}.container{padding:0}.similar-tools-section,.best-practices-section,.implementation-section,.advanced-section,.faq-section,.info-section,.tips-section{padding-left:var(--space-3);padding-right:var(--space-3);margin-left:0;margin-right:0;border-radius:var(--radius-md)}.hero-section{padding:var(--space-10) var(--space-6);margin:var(--space-6) var(--space-4);border-radius:var(--radius-xl);width:calc(100% - var(--space-8));background-color:#fff;box-shadow:0 4px 24px #00000014}.hero-section h1{font-size:1.75rem;line-height:1.2;font-weight:700;margin-bottom:var(--space-3)}.input-section{padding:var(--space-3)}.menu-toggle{display:block}.header-container{padding:var(--space-3) var(--space-3)!important;min-height:56px!important;margin-bottom:0!important}.brand-icon{font-size:1.4rem!important}.site-header.header-scrolled .brand-icon{font-size:1.2rem!important}.brand-text{font-size:1rem!important}.site-header.header-scrolled .brand-text{font-size:.95rem!important}.brand-tagline{display:none!important}.main-nav{position:fixed;top:0;left:100%;width:85vw;max-width:320px;height:100vh;background-color:var(--color-primary-700);box-shadow:var(--shadow-lg);transform:translate(0);transition:transform var(--transition-normal);padding:0;overflow:hidden;z-index:var(--z-fixed);display:flex;flex-direction:column;overscroll-behavior:contain;will-change:transform;touch-action:pan-y;visibility:hidden}.main-nav.active{transform:translate(-100%);visibility:visible}.main-nav>.nav-list{flex:1;overflow-y:auto;padding:var(--space-2) 0 var(--space-4)}.nav-list{flex-direction:column;gap:0;width:100%}.nav-link{width:100%;padding:var(--space-4);border-radius:0;border-bottom:1px solid rgba(255,255,255,.1);justify-content:space-between}.nav-item.has-dropdown{display:flex;flex-direction:column}.mega-dropdown{position:static!important;transform:none!important;margin:0!important;padding:0!important;background:var(--color-primary-800)!important;box-shadow:none!important;border:none!important;border-radius:0!important;width:100%!important;max-width:none!important;max-height:0!important;overflow:hidden!important;transition:max-height var(--transition-smooth)!important;box-sizing:border-box!important}.nav-item.has-dropdown.is-open .mega-dropdown,.nav-item.is-open .mega-dropdown,.dropdown-trigger[aria-expanded=true]+.mega-dropdown{max-height:1000px!important;padding:var(--space-2) 0!important;border-top:1px solid rgba(255,255,255,.1)!important;transform:none!important;left:auto!important;position:static!important}.share-dropdown{width:auto;max-width:none}.mega-dropdown-container{grid-template-columns:1fr;gap:var(--space-2);padding:0}.mega-dropdown-column{padding:var(--space-1) var(--space-3);border-bottom:1px solid rgba(255,255,255,.05)}.mega-dropdown-column:last-child{border-bottom:none}.dropdown-heading{color:#ffffffe6;font-size:.75rem;margin-bottom:var(--space-1)}.dropdown-link{color:#fffc;font-size:.75rem;padding:var(--space-1) var(--space-2)}.dropdown-link:hover{background-color:#ffffff1a;color:#fff;transform:none}.mega-dropdown-footer{padding:var(--space-1) var(--space-3);border-top:1px solid rgba(255,255,255,.1);margin:0}.dropdown-all-link{width:100%;justify-content:center}.nav-cta{width:100%;justify-content:center;text-align:center}.cta-item{width:100%}.footer-grid{grid-template-columns:repeat(2,1fr);gap:var(--space-6)}.site-footer{padding:var(--space-8) var(--space-3) var(--space-4)}h1{font-size:2rem;line-height:1.2}h2{font-size:1.5rem}.hero-section{padding:var(--space-6) var(--space-4);margin-bottom:var(--space-4)}.hero-description{font-size:.95rem;line-height:1.6}h3{font-size:1.25rem}.input-section .card h2,.info-section .card h2,.advanced-section h2{font-size:1.2rem}.similar-tools-section h3{font-size:1.1rem}.container{padding:var(--space-4) var(--space-3)}.card{padding:var(--space-3)}.button,.btn{min-height:44px;padding:var(--space-3) var(--space-4);font-size:1rem}input,select,textarea{min-height:44px;font-size:16px}.method-list{grid-template-columns:1fr}.action-buttons{flex-direction:column;gap:var(--space-2)}.action-buttons .btn,.action-buttons button{width:100%}.param-group{margin-bottom:var(--space-2)}.grade-boundaries .boundary-row{flex-wrap:wrap;gap:var(--space-2)}.grade-distribution .distribution-row{padding:var(--space-2);font-size:.9rem}.helper-text,.example-text{font-size:.875rem}#grades-input{font-size:16px;min-height:120px}.individual-inputs .input-group{gap:var(--space-2)}.curve-param-section{padding:var(--space-3)}h2{font-size:1.2rem;margin-bottom:var(--space-3)}h3{font-size:1rem;margin-bottom:var(--space-2)}h4{font-size:.9rem}.card{margin-bottom:var(--space-3);border-radius:var(--radius-lg)}.info-section{margin-top:var(--space-4);margin-bottom:var(--space-4);padding:var(--space-3) 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