@font-face{font-family:Google Sans;src:url(/fonts/GoogleSans-VariableFont_GRAD,opsz,wght-latin.woff2) format("woff2");font-weight:400 700;font-style:normal;font-display:swap}@font-face{font-family:Kantumruy Pro;src:url(/fonts/KantumruyPro-VariableFont_wght.woff2) format("woff2");font-weight:100 900;font-style:normal;font-display:swap}@font-face{font-family:Noto Sans Khmer;src:url(/fonts/NotoSansKhmer-khmer.woff2) format("woff2");font-weight:100 900;font-style:normal;font-display:swap}:root{--font-google-sans: "Google Sans";--font-kantumruy-pro: "Kantumruy Pro";--font-noto-sans-khmer: "Noto Sans Khmer"}:root{--font-heading: var(--font-kantumruy-pro), var(--font-google-sans), var(--font-noto-sans-khmer), system-ui, sans-serif;--font-body: var(--font-google-sans), var(--font-noto-sans-khmer), system-ui, sans-serif;--line-height-khmer: 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#ffffff;--color-surface-2: #f1f5f9;--color-text: #1a202c;--color-text-muted: #4a5568;--color-border: #e2e8f0;--color-border-dark: #cbd5e1;--color-link: #2b6cb0;--color-link-hover: #2c5282;--color-nav-bg: #2d3748;--color-nav-text: #ffffff;--color-info-bg: #ebf8ff;--color-info-text: #2c5282;--color-success-bg: #f0fff4;--color-success-text: #22543d;--color-warning-bg: #fffbeb;--color-warning-text: #92400e;--color-danger-bg: #fff5f5;--color-danger-text: #822727;--color-success: #16a34a;--color-warning: #d97706;--color-danger: #dc2626;--color-info: #0891b2;--sp-1: .25rem;--sp-2: .5rem;--sp-3: .75rem;--sp-4: 1rem;--sp-5: 1.25rem;--sp-6: 1.5rem;--sp-8: 2rem;--sp-10: 2.5rem;--sp-12: 3rem;--sp-16: 4rem;--radius-sm: .25rem;--radius: .5rem;--radius-lg: .75rem;--radius-xl: 1rem;--radius-full: 9999px;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .05);--shadow: 0 4px 6px -1px rgba(0, 0, 0, .1), 0 2px 4px -1px rgba(0, 0, 0, .06);--shadow-md: 0 10px 15px -3px rgba(0, 0, 0, .1), 0 4px 6px -2px rgba(0, 0, 0, .05);--shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, .1), 0 10px 10px -5px rgba(0, 0, 0, .04);--shadow-xl: 0 25px 50px -12px rgba(0, 0, 0, .25);--grad-primary: linear-gradient(135deg, #2733ff 0%, #1e26cc 100%);--grad-teacher: linear-gradient(135deg, #5e68ff 0%, #2733ff 100%);--grad-student: linear-gradient(135deg, #10b981 0%, #059669 100%);--grad-gold: linear-gradient(135deg, #fac405 0%, #d6a804 100%);--glass-bg: rgba(255, 255, 255, .7);--glass-border: rgba(255, 255, 255, .3);--sidebar-w: 240px;--sidebar-w-collapsed: 68px;--topbar-h: 64px;--transition: .2s cubic-bezier(.4, 0, .2, 1);--transition-slow: .4s cubic-bezier(.4, 0, .2, 1)}[data-theme=dark]{--color-background: #0f172a;--color-surface: #1e293b;--color-surface-2: #162032;--color-text: #e2e8f0;--color-text-muted: #94a3b8;--color-border: #334155;--color-border-dark: #475569;--color-link: #60a5fa;--color-link-hover: #93c5fd;--color-nav-bg: #1e293b;--color-nav-text: #e2e8f0;--color-info-bg: #1e3a5f;--color-info-text: #90cdf4;--color-success-bg: #064e2e;--color-success-text: #6ee7b7;--color-warning-bg: #431a00;--color-warning-text: #fcd34d;--color-danger-bg: #450a0a;--color-danger-text: #fca5a5;--glass-bg: rgba(30, 41, 59, .85);--glass-border: rgba(71, 85, 105, .5);--shadow-sm: 0 1px 3px rgba(0, 0, 0, .4);--shadow: 0 4px 6px -1px rgba(0, 0, 0, .5), 0 2px 4px -1px rgba(0, 0, 0, .4);--shadow-md: 0 10px 15px -3px rgba(0, 0, 0, .5), 0 4px 6px -2px rgba(0, 0, 0, .4);--shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, .6), 0 10px 10px -5px rgba(0, 0, 0, .4);--shadow-xl: 0 25px 50px -12px rgba(0, 0, 0, .7);--navy-25: #162032;--navy-50: #1a2744;--navy-100: #243552;--navy-200: #334d6e;--navy-300: #4a7fa0;--navy-400: #5a9ab8;--navy-500: #60a5fa;--navy-600: #93c5fd;--navy-700: #bfdbfe;--navy-800: #dbeafe;--navy-900: #e2e8f0}[data-theme=dark] .prose{color:var(--color-text)}[data-theme=dark] .prose font[color="#000000"],[data-theme=dark] .prose font[color="#000"],[data-theme=dark] .prose font[color=black],[data-theme=dark] .prose [style*="color: #000000"],[data-theme=dark] .prose [style*="color:#000000"],[data-theme=dark] .prose [style*="color: #000"],[data-theme=dark] .prose [style*="color:#000"],[data-theme=dark] .prose [style*="color: black"],[data-theme=dark] .prose [style*="color:black"],[data-theme=dark] .prose [style*="color: rgb(0, 0, 0)"],[data-theme=dark] .prose [style*="color:rgb(0, 0, 0)"]{color:var(--color-text)!important}[data-theme=dark] .prose [style*="background-color: white"],[data-theme=dark] .prose [style*="background-color:white"],[data-theme=dark] .prose [style*="background-color: #ffffff"],[data-theme=dark] .prose [style*="background-color:#ffffff"],[data-theme=dark] .prose [style*="background-color: #fff"],[data-theme=dark] .prose [style*="background-color:#fff"],[data-theme=dark] .prose [style*="background-color: rgb(255, 255, 255)"],[data-theme=dark] .prose [style*="background-color:rgb(255, 255, 255)"]{background-color:transparent!important}html{font-size:16px;-webkit-text-size-adjust:100%;scroll-behavior:smooth;overflow-x:clip}body{font-family:var(--font-google-sans),var(--font-noto-sans-khmer),system-ui,sans-serif;line-height:1.7;color:var(--color-text);background-color:var(--color-background);-webkit-font-smoothing:antialiased;overflow-x:clip}h1,h2,h3,h4,h5,h6{font-family:var( --font-heading, "Kantumruy Pro", var(--font-google-sans), var(--font-noto-sans-khmer), system-ui, sans-serif )}[lang=km]{word-break:keep-all;line-break:strict;overflow-wrap:anywhere}a{color:var(--color-link);text-decoration:none;transition:color var(--transition)}a:hover{color:var(--color-link-hover);text-decoration:underline}img,svg{display:block;max-width:100%}.prose div[style*=padding-bottom][style*="position:relative"],.lesson-content div[style*=padding-bottom][style*="position:relative"]{position:relative!important;height:0!important;padding-bottom:56.25%!important;overflow:hidden!important;width:100%!important}.prose div[style*=padding-bottom] iframe,.lesson-content div[style*=padding-bottom] iframe{position:absolute!important;top:0!important;left:0!important;width:100%!important;height:100%!important;border:0}.prose>iframe,.lesson-content>iframe{width:100%!important;height:auto!important;aspect-ratio:16 / 9;display:block}iframe{border:none}button{cursor:pointer;font-family:inherit;border:none;background:none}input,select,textarea{font-family:inherit;font-size:inherit}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--color-border-dark);border-radius:var(--radius-full)}:focus-visible{outline:2px solid var(--color-link);outline-offset:3px;border-radius:2px}:focus:not(:focus-visible){outline:none}.skip-link{position:absolute;top:-100%;left:var(--sp-4);z-index:9999;background:var(--color-link);color:#fff;padding:var(--sp-2) var(--sp-5);border-radius:0 0 var(--radius) var(--radius);font-weight:600;font-size:.875rem;text-decoration:none;transition:top .15s ease}.skip-link:focus{top:0;outline:2px solid #ffffff;outline-offset:2px}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.truncate{overflow:hidden;white-space:nowrap;text-overflow:ellipsis}@keyframes fadeIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}@keyframes slideInRight{0%{opacity:0;transform:translate(20px)}to{opacity:1;transform:translate(0)}}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}@keyframes spin{to{transform:rotate(360deg)}}.animate-fadeIn{animation:fadeIn .3s ease forwards}.animate-slideIn{animation:slideInRight .3s ease forwards}.animate-pulse{animation:pulse 1.5s ease infinite}.animate-spin{animation:spin .7s linear infinite}.dict-popover{background:var(--color-surface, #fff);border:1px solid var(--color-border, #e2e8f0);border-radius:10px;box-shadow:0 4px 16px #0000001f;font-size:.82rem;line-height:1.5;min-width:150px;max-width:460px;overflow:hidden;animation:fadeIn .15s ease}.dict-popover__arrow{position:absolute;top:-6px;left:16px;width:0;height:0;border-left:6px solid transparent;border-right:6px solid transparent;border-bottom:6px solid var(--color-border, #e2e8f0)}.dict-popover__arrow:after{content:"";position:absolute;top:1px;left:-5px;width:0;height:0;border-left:5px solid transparent;border-right:5px solid transparent;border-bottom:5px solid var(--color-surface, #fff)}.dict-popover__header{display:flex;align-items:center;justify-content:space-between;padding:6px 10px 5px;border-bottom:1px solid var(--color-border, #e2e8f0);gap:8px}.dict-popover__query{font-weight:600;color:var(--color-text, #1e293b);font-size:.8rem;word-break:break-word}.dict-popover__close{background:none;border:none;cursor:pointer;color:var(--color-text-muted, #64748b);font-size:1.1rem;line-height:1;padding:0 2px;flex-shrink:0}.dict-popover__close:hover{color:var(--color-text, #1e293b)}.dict-popover__body{padding:0;min-height:30px;display:flex;align-items:center}.dict-popover__loading{display:flex;align-items:center;gap:6px;color:var(--color-text-muted, #64748b);font-size:.8rem;padding:7px 10px}.dict-popover__spinner{display:inline-block;width:12px;height:12px;border:2px solid var(--color-border-dark, #cbd5e1);border-top-color:var(--color-primary, #1a56db);border-radius:50%;animation:spin .7s linear infinite;flex-shrink:0}.dict-popover__translation{color:var(--color-text, #1e293b);font-family:var(--font-google-sans),var(--font-noto-sans-khmer),system-ui,sans-serif;font-size:.92rem;word-break:keep-all;padding:7px 10px}.dict-popover__col .dict-popover__translation{padding:0}.dict-popover__error{color:#ef4444;font-size:.78rem;font-style:italic;padding:7px 10px}.dict-popover__footer{padding:3px 10px 5px;font-size:.68rem;color:var(--color-text-muted, #64748b);border-top:1px solid var(--color-border, #e2e8f0);opacity:.7}.dict-popover__cols{display:grid;grid-template-columns:1fr 1fr}.dict-popover__col{padding:7px 10px;display:flex;flex-direction:column;gap:3px}.dict-popover__col--km{border-left:1px solid var(--color-border, #e2e8f0);justify-content:center}.dict-popover__phonetic{font-size:.75rem;color:var(--color-text-muted, #64748b);font-style:italic}.dict-popover__pos{font-size:.7rem;color:var(--color-primary, #1a56db);font-weight:600;text-transform:capitalize}.dict-popover__def{font-size:.8rem;color:var(--color-text, #1e293b);line-height:1.45;margin:0}