:root{--color-primary: #1D3557;--color-primary-hover: #0F4C81;--color-primary-light: #D6E4F0;--color-secondary: #5C636A;--color-secondary-hover: #43484E;--color-danger: #B02A37;--color-danger-hover: #8C222E;--color-success: #2D6A4F;--color-warning: #CC8400;--bg-body: #F8F9FA;--bg-surface: #F4F4F0;--bg-surface-elevated: #FFFFFF;--bg-input: #EEF0F2;--bg-hover: #E9ECEF;--bg-overlay: rgba(0, 0, 0, .5);--text-primary: #212529;--text-secondary: #343A40;--text-muted: #6C757D;--text-inverse: #FFFFFF;--text-link: #1D3557;--border-color: #DEE2E6;--border-color-focus: #1D3557;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .06);--shadow-md: 0 2px 4px rgba(0, 0, 0, .08);--shadow-lg: 0 4px 8px rgba(0, 0, 0, .1);--radius-sm: 2px;--radius-md: 3px;--radius-lg: 4px;--radius-xl: 4px;--radius-full: 9999px;--font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif;--font-sans-en: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif;--font-sans-fa: "Vazirmatn", "IRANSans", "Tahoma", "Arial", sans-serif;--font-mono: "SF Mono", "Cascadia Code", "Consolas", "Liberation Mono", monospace;--space-1: clamp(.125rem, .1rem + .15vw, .25rem);--space-2: clamp(.25rem, .2rem + .25vw, .5rem);--space-3: clamp(.5rem, .4rem + .4vw, .75rem);--space-4: clamp(.75rem, .6rem + .5vw, 1rem);--space-5: clamp(1rem, .8rem + .6vw, 1.25rem);--space-6: clamp(1.25rem, 1rem + .75vw, 1.5rem);--space-8: clamp(1.5rem, 1.2rem + 1vw, 2rem);--space-10: clamp(2rem, 1.6rem + 1.2vw, 2.5rem);--space-12: clamp(2.5rem, 2rem + 1.5vw, 3rem);--level-beginner-bg: rgba(34, 197, 94, .15);--level-beginner-color: #16a34a;--level-intermediate-bg: rgba(234, 179, 8, .15);--level-intermediate-color: #ca8a04;--level-advanced-bg: rgba(239, 68, 68, .15);--level-advanced-color: #dc2626;--transition-fast: .15s ease;--transition-normal: .25s ease;--transition-slow: .35s ease}[data-theme=dark]{--color-primary: #82A0D8;--color-primary-hover: #9BB8E8;--color-primary-light: #1A2744;--color-secondary: #8A929A;--color-secondary-hover: #A4ABAE;--color-danger: #EA868F;--color-danger-hover: #F19CA5;--color-success: #6DB38B;--color-warning: #E0A82E;--bg-body: #1A1A1A;--bg-surface: #1E1E1E;--bg-surface-elevated: #2D2D2D;--bg-input: #252525;--bg-hover: #2D2D2D;--bg-overlay: rgba(0, 0, 0, .7);--text-primary: #E9ECEF;--text-secondary: #CED4DA;--text-muted: #6C757D;--text-inverse: #1A1A1A;--text-link: #82A0D8;--border-color: #3A3A3A;--border-color-focus: #82A0D8;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .3);--shadow-md: 0 2px 4px rgba(0, 0, 0, .4);--shadow-lg: 0 4px 8px rgba(0, 0, 0, .4)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:clamp(14px,1vw + 12px,16px);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}html[dir=rtl]{direction:rtl;text-align:right}html[dir=ltr]{direction:ltr;text-align:left}body{font-family:var(--font-sans);background-color:var(--bg-body);color:var(--text-primary);line-height:1.6;min-height:100dvh;transition:background-color var(--transition-normal),color var(--transition-normal)}html[dir=ltr] body{font-family:var(--font-sans-en)}html[dir=rtl] body{font-family:var(--font-sans-fa)}a{color:var(--text-link);text-decoration:none;transition:color var(--transition-fast)}a:hover{text-decoration:underline}a:active{opacity:.8}img{max-width:100%;height:auto}button{cursor:pointer;font-family:inherit}button:focus-visible{outline:2px solid var(--color-primary);outline-offset:2px}button:active{opacity:.9}input,textarea,select{font-family:inherit;font-size:inherit}input:focus-visible,textarea:focus-visible,select:focus-visible{outline:2px solid var(--color-primary);outline-offset:1px}:focus-visible{outline:2px solid var(--color-primary);outline-offset:2px}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:var(--bg-body)}::-webkit-scrollbar-thumb{background:var(--text-muted);border-radius:var(--radius-full)}::-webkit-scrollbar-thumb:hover{background:var(--text-secondary)}@media(max-width:768px){html{font-size:14px}.container{padding-inline:var(--space-3)}}.container{width:100%;max-width:1200px;margin-inline:auto;padding-inline:var(--space-4)}.card{background-color:var(--bg-surface);border:1px solid var(--border-color);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);padding:var(--space-6);transition:background-color var(--transition-normal),border-color var(--transition-normal)}.skeleton{background:linear-gradient(90deg,var(--bg-hover) 25%,var(--bg-surface-elevated) 50%,var(--bg-hover) 75%);background-size:200% 100%;animation:skeleton-shimmer 1.5s ease-in-out infinite;border-radius:var(--radius-sm)}@keyframes skeleton-shimmer{0%{background-position:200% 0}to{background-position:-200% 0}}.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border-width:0}