:root{--color-primary: #4f46e5;--color-primary-hover: #4338ca;--color-secondary: #2563eb;--color-secondary-hover: #1d4ed8;--color-success: #16a34a;--color-success-hover: #15803d;--color-text-light: #f9fafb;--color-text-dark: #111827;--color-text-gray: #6b7280;--color-text-gray-light: #9ca3af;--color-bg-light: #f9fafb;--color-bg-dark: #111827;--color-border-light: #e5e7eb;--color-border-dark: #4b5563;--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, .05);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .1), 0 2px 4px -1px rgba(0, 0, 0, .06);--border-radius-sm: .25rem;--border-radius-md: .375rem;--border-radius-lg: .5rem}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Open Sans,Helvetica Neue,sans-serif;background-color:var(--color-bg-light);color:var(--color-text-dark);line-height:1.5}.dark-mode{background-color:var(--color-bg-dark);color:var(--color-text-light)}.container{width:100%;margin:0 auto;padding:0 1rem}.min-h-screen{min-height:100vh}.w-36{width:36px!important}.h-36{height:36px!important}.py-8{padding-top:2rem;padding-bottom:2rem}.mb-8{margin-bottom:2rem}.mb-4{margin-bottom:1rem}.mb-6{margin-bottom:1.5rem}.p-4{padding:1rem}.p-6{padding:1.5rem!important}.mt-4{margin-top:1rem}.mt-1{margin-top:.25rem}.ml-3{margin-left:.75rem}.text-center{text-align:center}h1{font-size:2rem;font-weight:700;margin-bottom:2rem}.text-2xl{font-size:1.75rem!important}.text-sm{font-size:.875rem}.text-xs{font-size:.75rem}.font-medium{font-weight:500}.font-semibold{font-weight:600}.text-xl{font-size:1.25rem}.flex{display:flex}.flex-col{flex-direction:column}.justify-center{justify-content:center}.justify-between{justify-content:space-between}.items-center{align-items:center}.gap-3{gap:.75rem}.gap-4{gap:1rem}.grid{display:grid}.grid-cols-1{grid-template-columns:repeat(1,minmax(0,1fr))}.flex-1{flex:1}.card{background:#ffffffb3;backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-radius:var(--border-radius-lg);box-shadow:var(--shadow-sm);padding:1rem;border:1px solid rgba(255,255,255,.3);transition:background-color .3s}.card.dark{background:#1e222cb3;backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-color:#3c3c504d}.shadow-sm{box-shadow:var(--shadow-sm)}.rounded-md{border-radius:var(--border-radius-md)}.rounded-lg{border-radius:var(--border-radius-lg)}.border{border:1px solid var(--color-border-light)}.btn{display:inline-flex;align-items:center;justify-content:center;padding:.5rem 1rem;font-size:.875rem;font-weight:500;border-radius:var(--border-radius-md);border:1px solid transparent;cursor:pointer;transition:background-color .15s,border-color .15s,color .15s}.btn:focus{outline:none;box-shadow:0 0 0 2px #3b82f680}.btn-primary{background-color:var(--color-primary);color:#fff}.btn-primary:hover{background-color:var(--color-primary-hover)}.btn-secondary{background-color:var(--color-secondary);color:#fff}.btn-secondary:hover{background-color:var(--color-secondary-hover)}.btn-success{background-color:var(--color-success);color:#fff}.btn-success:hover{background-color:var(--color-success-hover)}.btn-large{font-size:1.05rem;padding:.65rem 1.25rem;font-weight:600;transition:all .2s ease}.btn-large:hover{transform:translateY(-2px);box-shadow:0 4px 10px #00000026}.btn-large svg{width:20px;height:20px}.btn-generate{background-color:#410d78;color:#fff;border:none}.btn-generate:hover{background-color:#410d78}.dark-mode .btn-generate{background-color:#410d78;color:#fff}.dark-mode .btn-generate:hover{background-color:#410d78}input[type=number],input[type=text],input[type=file]{padding:.5rem .75rem;border:1px solid var(--color-border-light);border-radius:var(--border-radius-md);font-size:.875rem;width:100%;background-color:#fff}input[type=number]:focus,input[type=text]:focus{outline:none;border-color:var(--color-primary);box-shadow:0 0 0 1px var(--color-primary)}.dark input[type=number],.dark input[type=text]{background-color:#374151;border-color:var(--color-border-dark);color:var(--color-text-light)}input[type=checkbox]{width:1.25rem;height:1.25rem;border-radius:.25rem;cursor:pointer;margin-top:.25rem}.hidden{display:none}label{display:block;font-size:.875rem;font-weight:500;margin-bottom:.25rem;cursor:pointer}label.btn{display:inline-flex;align-items:center;justify-content:center;margin-bottom:0;padding:.5rem 1rem;font-size:.875rem;font-weight:500;border-radius:var(--border-radius-md);border:1px solid transparent;cursor:pointer}label.btn-primary{background-color:var(--color-primary);color:#fff}label.btn-primary:hover{background-color:var(--color-primary-hover)}.concept-list{display:grid;grid-template-columns:repeat(1,minmax(0,1fr));gap:.75rem}.concept-card{display:flex;align-items:start;padding:.75rem;border-radius:var(--border-radius-md);background:#ffffffb3;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);border:1px solid rgba(255,255,255,.3);box-shadow:var(--shadow-sm);cursor:pointer;transition:all .15s ease-in-out;position:relative}.concept-card:hover{background:#ffffffd9}.concept-card.unchecked{background:#f3f4f6b3;border-color:#d1d5db80}.concept-card.unchecked:hover{background:#e5e7ebcc}.concept-card.dark{background:#1f2937b3;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);border-color:#4b556380}.concept-card.dark:hover{background:#374151cc}.concept-card.dark.unchecked{background:#37415199;border-color:#6b728066}.concept-card.dark.unchecked:hover{background:#4b5563b3}.concept-content{margin-left:.75rem;flex:1}.concept-title{font-weight:500;font-size:.875rem}.concept-description{font-size:.75rem;color:var(--color-text-gray);overflow:hidden;text-overflow:ellipsis}.concept-card.unchecked .concept-title,.concept-card.unchecked .concept-description{text-decoration:line-through;color:var(--color-text-gray-light)}.error-message{padding:1rem;background-color:#fee2e2;border-left:4px solid #ef4444;color:#b91c1c;border-radius:0 .375rem .375rem 0;margin-bottom:1.5rem}.error-message.dark{background-color:#ef444433;border-color:#ef4444;color:#fca5a5}.preview-container{margin-bottom:2rem;background-color:#fff;border-radius:var(--border-radius-lg);box-shadow:var(--shadow-sm);padding:1rem}.preview-container.dark{background-color:#1f2937}.aspect-ratio-container{position:relative;padding-top:56.25%;border:1px solid var(--color-border-light)}.aspect-ratio-container iframe{position:absolute;top:0;left:0;width:100%;height:100%}@media (min-width: 640px){.sm-flex-row{flex-direction:row}.sm-w-auto{width:auto}}@media (min-width: 768px){.md-grid-cols-2{grid-template-columns:repeat(2,minmax(0,1fr))}}@media (min-width: 1024px){.lg-grid-cols-4{grid-template-columns:repeat(4,minmax(0,1fr))}}.studicious-bg{background-size:100% 100%;background-position:0px 0px,0px 0px,0px 0px,0px 0px,0px 0px;background-image:radial-gradient(49% 81% at 45% 47%,#1b170045,#073aff00),radial-gradient(113% 91% at 17% -2%,#2a005f 1%,#f000 99%),radial-gradient(142% 91% 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.studicious-tip{background:#1f2937b3;color:#f3f4f6}.studicious-tutorial{background:#ffffffb3;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);color:#222;margin-bottom:2rem;border-radius:var(--border-radius-lg);padding:1.5rem;max-width:700px;margin-left:auto;margin-right:auto}.studicious-tutorial-title{font-weight:700;font-size:1.3rem;margin-bottom:.7rem}.studicious-tutorial-list{padding-left:1.2rem;margin:0;font-size:1rem;line-height:1.7}.studicious-tutorial-tip{font-size:.95rem;margin-top:.7rem;color:#444}.studicious-concept-widget{background:#ffffffb3;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);color:#222;margin-bottom:2rem;border-radius:var(--border-radius-lg);padding:1.5rem;max-width:700px;margin-left:auto;margin-right:auto;box-shadow:0 2px 16px #0002}.studicious-concept-label{font-weight:600;margin-bottom:6px;display:block}.studicious-concept-textarea{width:100%;border-radius:8px;border:1px solid #bbb;padding:10px;font-size:1rem;margin-bottom:10px;resize:vertical}.studicious-copy-btn{margin-right:10px;font-weight:600}.studicious-concept-hint{color:#444;font-size:.97rem}.studicious-upload-controls{transition:box-shadow .3s,border .3s}.studicious-upload-highlight{box-shadow:0 0 0 4px #073aff88,0 2px 16px #0002!important;border:2px solid #073aff!important}.studicious-upload-highlight .btn-primary{background:#073aff!important;color:#fff!important;border:2px solid #073aff!important;box-shadow:0 0 0 2px #073aff88!important}.dark-mode-toggle{background:#fffc;backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border:1px solid rgba(255,255,255,.3);box-shadow:0 4px 6px #0000001a;cursor:pointer;font-size:1.25rem}.dark-mode .dark-mode-toggle{background:#1e222ccc;border-color:#ffffff1a}.fixed{position:fixed}.sticky{position:sticky}.top-4{top:1rem}.left-4{left:1rem}.right-4{right:1rem}.z-50{z-index:50}.p-3{padding:.75rem}.rounded-full{border-radius:9999px}.transition-all{transition-property:all}.duration-200{transition-duration:.2s}.hover\:scale-110:hover{transform:scale(1.1)}.gh-stars{position:fixed;top:.5rem;right:.5rem;z-index:50;font-size:1.75rem;cursor:pointer;transition:all .2s ease}.theme-toggle{display:none;position:fixed;top:4rem;right:1.5rem;z-index:50;font-size:1.75rem;background:#fffc;backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border:0px solid rgba(255,255,255,.3);border-radius:50%;box-shadow:0 4px 6px #0000001a;cursor:pointer;transition:all .2s ease}.theme-toggle:hover{transform:scale(1.05)}.dark-mode .theme-toggle{background-color:#1e222ccc}.theme-controls{position:fixed;top:1rem;right:1rem;z-index:50;display:flex;align-items:center;gap:10px}.github-star-btn{background-color:#fffc;backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px);border-radius:var(--border-radius-md);box-shadow:0 2px 10px #0000001a;overflow:hidden}.dark-mode .github-star-btn{background-color:#1e222ccc}@media (max-width: 640px){.theme-controls{flex-direction:column}.github-star-btn{margin-top:10px}}