@import url("https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap");:root{--primary-50:#f0f9ff;--primary-100:#e0f2fe;--primary-200:#bae6fd;--primary-300:#7dd3fc;--primary-400:#38bdf8;--primary-500:#0ea5e9;--primary-600:#0284c7;--primary-700:#0369a1;--primary-800:#075985;--primary-900:#0c4a6e;--secondary-50:#fdf4ff;--secondary-100:#fae8ff;--secondary-200:#f5d0fe;--secondary-300:#f0abfc;--secondary-400:#e879f9;--secondary-500:#d946ef;--secondary-600:#c026d3;--secondary-700:#a21caf;--secondary-800:#86198f;--secondary-900:#701a75;--neutral-50:#fafafa;--neutral-100:#f5f5f5;--neutral-200:#e5e5e5;--neutral-300:#d4d4d4;--neutral-400:#a3a3a3;--neutral-500:#737373;--neutral-600:#525252;--neutral-700:#404040;--neutral-800:#262626;--neutral-900:#171717;--success-50:#f0fdf4;--success-500:#22c55e;--success-600:#16a34a;--warning-50:#fffbeb;--warning-500:#f59e0b;--warning-600:#d97706;--error-50:#fef2f2;--error-500:#ef4444;--error-600:#dc2626;--primary-color:var(--primary-600);--primary-hover:var(--primary-700);--secondary-color:var(--secondary-600);--text-color:var(--neutral-900);--text-light:var(--neutral-600);--text-muted:var(--neutral-500);--bg-color:var(--neutral-50);--bg-card:#ffffff;--bg-subtle:var(--neutral-100);--border-color:var(--neutral-200);--border-light:var(--neutral-100);--shadow-xs:0 1px 2px 0 rgb(0 0 0/0.05);--shadow-sm:0 1px 3px 0 rgb(0 0 0/0.1),0 1px 2px -1px rgb(0 0 0/0.1);--shadow-md:0 4px 6px -1px rgb(0 0 0/0.1),0 2px 4px -2px rgb(0 0 0/0.1);--shadow-lg:0 10px 15px -3px rgb(0 0 0/0.1),0 4px 6px -4px rgb(0 0 0/0.1);--shadow-xl:0 20px 25px -5px rgb(0 0 0/0.1),0 8px 10px -6px rgb(0 0 0/0.1);--shadow-2xl:0 25px 50px -12px rgb(0 0 0/0.25);--radius-sm:0.375rem;--radius-md:0.5rem;--radius-lg:0.75rem;--radius-xl:1rem;--radius-2xl:1.5rem;--radius-full:9999px;--spacing-xs:0.25rem;--spacing-sm:0.5rem;--spacing-md:1rem;--spacing-lg:1.5rem;--spacing-xl:2rem;--spacing-2xl:3rem;--transition-fast:150ms cubic-bezier(0.4,0,0.2,1);--transition-normal:300ms cubic-bezier(0.4,0,0.2,1);--transition-slow:500ms cubic-bezier(0.4,0,0.2,1)}.dark-mode{--text-color:var(--neutral-100);--text-light:var(--neutral-300);--text-muted:var(--neutral-400);--bg-color:var(--neutral-900);--bg-card:var(--neutral-800);--bg-subtle:var(--neutral-800);--border-color:var(--neutral-700);--border-light:var(--neutral-800);--primary-color:var(--primary-400);--primary-hover:var(--primary-300);--secondary-color:var(--secondary-400)}*,:after,:before{box-sizing:border-box}*{margin:0;padding:0}body{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;font-feature-settings:"cv11","ss01";font-variation-settings:"opsz" 32;color:var(--text-color);background:linear-gradient(135deg,var(--primary-50) 0,var(--secondary-50) 100%);background-attachment:fixed;line-height:1.6;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;min-height:100vh;overflow-x:hidden}h1,h2,h3,h4,h5,h6{font-weight:600;line-height:1.2;letter-spacing:-.025em}a{color:var(--primary-color);text-decoration:none;transition:color var(--transition-fast)}a:hover{color:var(--primary-hover)}a:focus-visible{outline:2px solid var(--primary-color);outline-offset:2px;border-radius:var(--radius-sm)}.container{width:100%;max-width:1280px;margin:0 auto;padding:var(--spacing-xl) var(--spacing-lg)}.header{text-align:center;margin-bottom:var(--spacing-2xl);animation:slideUp .8s ease-out}@keyframes slideUp{0%{opacity:0;transform:translateY(40px)}to{opacity:1;transform:translateY(0)}}.header h1{font-size:clamp(2rem,4vw,3.5rem);font-weight:800;margin-bottom:var(--spacing-md);background:linear-gradient(135deg,var(--primary-600) 0,var(--secondary-600) 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;position:relative;display:inline-block}.header p{font-size:1.25rem;color:var(--text-light);max-width:48rem;margin:0 auto var(--spacing-lg);font-weight:400}.header-logo{margin-bottom:var(--spacing-lg);display:flex;justify-content:center}.logo-container{display:flex;flex-direction:column;align-items:center;gap:var(--spacing-xs)}.logo-text{font-size:1.5rem;font-weight:700;color:var(--primary-600);letter-spacing:-.05em}.logo-text.large{font-size:2rem}.logo-tagline{font-size:.875rem;color:var(--text-muted);font-weight:500;text-transform:uppercase;letter-spacing:.1em}.header-highlight{display:inline-flex;align-items:center;gap:var(--spacing-sm);background:linear-gradient(135deg,var(--primary-50) 0,var(--secondary-50) 100%);border:1px solid var(--primary-200);border-radius:var(--radius-full);padding:var(--spacing-sm) var(--spacing-lg);font-size:.875rem;font-weight:600;color:var(--primary-700);margin-top:var(--spacing-lg);box-shadow:var(--shadow-sm);transition:all var(--transition-normal);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.header-highlight:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg);border-color:var(--primary-300)}.header-links{margin-top:var(--spacing-lg);display:flex;justify-content:center;gap:var(--spacing-md)}.header-link{display:inline-flex;align-items:center;gap:var(--spacing-sm);background:linear-gradient(135deg,var(--primary-600) 0,var(--primary-700) 100%);color:white;padding:var(--spacing-md) var(--spacing-xl);border-radius:var(--radius-lg);text-decoration:none;font-weight:600;font-size:1rem;transition:all var(--transition-normal);box-shadow:var(--shadow-md);position:relative;overflow:hidden}.header-link:before{content:"";position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,rgba(255,255,255,.2),transparent);transition:left var(--transition-slow)}.header-link:hover:before{left:100%}.header-link:hover{transform:translateY(-2px);box-shadow:var(--shadow-xl)}.header-link:active{transform:translateY(0);box-shadow:var(--shadow-md)}.main-content{background:var(--bg-card);border-radius:var(--radius-2xl);padding:var(--spacing-2xl);box-shadow:var(--shadow-xl);border:1px solid var(--border-light);position:relative;animation:fadeIn .8s ease-out .2s both;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px)}.main-content:before{content:"";position:absolute;top:0;left:0;right:0;height:4px;background:linear-gradient(90deg,var(--primary-500),var(--secondary-500));border-radius:var(--radius-2xl) var(--radius-2xl) 0 0}@keyframes fadeIn{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.tabs{display:flex;background:var(--bg-subtle);border-radius:var(--radius-xl);padding:var(--spacing-xs);margin-bottom:var(--spacing-xl);gap:var(--spacing-xs);overflow-x:auto}.tab{flex:1 1;min-width:max-content;padding:var(--spacing-md) var(--spacing-lg);border:none;background:transparent;color:var(--text-muted);font-weight:500;font-size:.9rem;border-radius:var(--radius-lg);cursor:pointer;transition:all var(--transition-fast);position:relative;white-space:nowrap}.tab:hover{color:var(--text-color);box-shadow:var(--shadow-sm)}.tab.active,.tab:hover{background:var(--bg-card)}.tab.active{color:var(--primary-color);font-weight:600;box-shadow:var(--shadow-md)}.tab:disabled{opacity:.5;cursor:not-allowed}.tab-content{animation:fadeIn .4s ease-out}.card{background:var(--bg-card);border-radius:var(--radius-xl);padding:var(--spacing-xl);margin-bottom:var(--spacing-xl);border:1px solid var(--border-color);box-shadow:var(--shadow-sm);transition:all var(--transition-normal)}.card:hover{box-shadow:var(--shadow-md);border-color:var(--primary-200)}.section-title{font-size:1.75rem;font-weight:700;color:var(--text-color);margin-bottom:var(--spacing-lg);position:relative;display:flex;align-items:center;gap:var(--spacing-md)}.section-title:before{content:"";width:4px;height:24px;background:linear-gradient(135deg,var(--primary-500),var(--secondary-500));border-radius:var(--radius-full)}.section-heading{font-size:1.25rem;font-weight:600;color:var(--text-color);display:flex;align-items:center;gap:var(--spacing-sm)}.form-group,.section-heading{margin-bottom:var(--spacing-lg)}.form-label{display:block;font-weight:600;color:var(--text-color);margin-bottom:var(--spacing-sm);font-size:.9rem;letter-spacing:.025em}.required:after{content:" *";color:var(--error-500);font-weight:500}.form-input,.form-select,.form-textarea{width:100%;padding:var(--spacing-md) var(--spacing-lg);border:2px solid var(--border-color);border-radius:var(--radius-lg);font-size:1rem;font-family:inherit;color:var(--text-color);background:var(--bg-card);transition:all var(--transition-fast);outline:none}.form-input:focus,.form-select:focus,.form-textarea:focus{border-color:var(--primary-color);box-shadow:0 0 0 3px var(--primary-100);transform:translateY(-1px)}.form-input:hover,.form-select:hover,.form-textarea:hover{border-color:var(--primary-300)}.form-input::placeholder{color:var(--text-muted)}.button{display:inline-flex;align-items:center;justify-content:center;gap:var(--spacing-sm);padding:var(--spacing-md) var(--spacing-xl);border:none;border-radius:var(--radius-lg);font-size:1rem;font-weight:600;font-family:inherit;cursor:pointer;transition:all var(--transition-normal);position:relative;overflow:hidden;text-decoration:none;min-height:48px;background:linear-gradient(135deg,var(--primary-600) 0,var(--primary-700) 100%);color:white;box-shadow:var(--shadow-md)}.button:before{content:"";position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,rgba(255,255,255,.2),transparent);transition:left var(--transition-slow)}.button:hover:before{left:100%}.button:hover{transform:translateY(-2px);box-shadow:var(--shadow-xl)}.button:focus-visible{outline:2px solid var(--primary-color);outline-offset:2px}.button:active{transform:translateY(0);box-shadow:var(--shadow-md)}.button:disabled{opacity:.6;cursor:not-allowed;transform:none!important;box-shadow:var(--shadow-sm)!important}.button:disabled:before{display:none}.button-secondary{background:var(--bg-card);color:var(--text-color);border:2px solid var(--border-color);box-shadow:var(--shadow-sm)}.button-secondary:hover{background:var(--bg-subtle);border-color:var(--primary-300)}.button-outline{background:transparent;color:var(--primary-color);border:2px solid var(--primary-color);box-shadow:none}.button-outline:hover{background:var(--primary-color);color:white}.button-ghost{background:transparent;color:var(--text-color);border:none;box-shadow:none}.button-ghost:hover{background:var(--bg-subtle)}.download-button{background:linear-gradient(135deg,var(--success-500) 0,var(--success-600) 100%);color:white;font-size:1.1rem;padding:var(--spacing-lg) var(--spacing-2xl);min-height:56px}.download-button:hover{background:linear-gradient(135deg,var(--success-600) 0,var(--success-700) 100%)}.error-message{background:linear-gradient(135deg,var(--error-50) 0,#fef7f7 100%);border:1px solid var(--error-200);border-left:4px solid var(--error-500);color:var(--error-700);padding:var(--spacing-lg);border-radius:var(--radius-lg);margin-bottom:var(--spacing-lg);font-weight:500;display:flex;align-items:center;gap:var(--spacing-sm);animation:shake .5s ease-in-out}@keyframes shake{0%,to{transform:translateX(0)}25%{transform:translateX(-5px)}75%{transform:translateX(5px)}}.error-message:before{content:"⚠️";font-size:1.25rem}.generated-content{border:2px solid var(--primary-100);background:linear-gradient(135deg,var(--primary-50) 0,white 100%)}.generated-content .section-heading{color:var(--primary-700)}.question-item{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:var(--spacing-lg);margin-bottom:var(--spacing-lg);transition:all var(--transition-normal);position:relative}.question-item:hover{border-color:var(--primary-200);box-shadow:var(--shadow-md);transform:translateY(-2px)}.question-title{font-size:1.1rem;color:var(--text-color);margin-bottom:var(--spacing-md);line-height:1.5}.option-item{display:flex;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-sm) var(--spacing-md);margin:var(--spacing-sm) 0;border-radius:var(--radius-md);background:var(--bg-subtle);transition:all var(--transition-fast);cursor:pointer}.option-item:hover{background:var(--primary-50);transform:translateX(4px)}.option-item.correct{background:linear-gradient(135deg,var(--success-50) 0,var(--success-100) 100%);border:1px solid var(--success-200);color:var(--success-700);font-weight:600}.option-item.correct:after{content:"✓";margin-left:auto;color:var(--success-600);font-weight:700}.loading-indicator{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:var(--spacing-2xl);color:var(--text-muted);gap:var(--spacing-lg)}.loading-spinner{width:40px;height:40px;border:4px solid var(--border-color);border-top-color:var(--primary-color);border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(1turn)}}.history-panel{background:var(--bg-subtle);border:1px solid var(--border-color);border-radius:var(--radius-xl);padding:var(--spacing-lg);margin-bottom:var(--spacing-xl);animation:slideDown .3s 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var(--transition-fast);display:flex;justify-content:space-between;align-items:center}.history-item:hover{border-color:var(--primary-200);background:var(--primary-50);transform:translateX(4px)}.history-item.active{border-color:var(--primary-400);background:var(--primary-100)}.history-item-content{flex:1 1}.history-item-topic{font-weight:600;color:var(--text-color);margin-bottom:var(--spacing-xs)}.history-item-subtopic{font-size:.875rem;color:var(--text-muted)}.history-item-actions{display:flex;gap:var(--spacing-sm)}.history-item-action{padding:var(--spacing-sm);border:none;background:transparent;color:var(--text-muted);cursor:pointer;border-radius:var(--radius-md);transition:all var(--transition-fast)}.history-item-action:hover{background:var(--error-100);color:var(--error-600)}.toggle-button{display:inline-flex;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-sm) var(--spacing-md);border:1px solid var(--border-color);background:var(--bg-card);color:var(--text-color);border-radius:var(--radius-lg);cursor:pointer;font-size:.875rem;font-weight:500;transition:all var(--transition-fast)}.toggle-button:hover{border-color:var(--primary-300);background:var(--primary-50)}.toggle-button svg{transition:transform var(--transition-fast)}.toggle-button.expanded svg{transform:rotate(180deg)}.tooltip{position:relative;display:inline-block}.tooltip-text{visibility:hidden;background:var(--neutral-800);color:white;text-align:center;border-radius:var(--radius-md);padding:var(--spacing-sm) var(--spacing-md);position:absolute;z-index:100;bottom:125%;left:50%;margin-left:-120px;width:240px;font-size:.75rem;font-weight:500;opacity:0;transition:all var(--transition-normal);box-shadow:var(--shadow-lg)}.tooltip-text:after{content:"";position:absolute;top:100%;left:50%;margin-left:-5px;border-width:5px;border-style:solid;border-color:var(--neutral-800) transparent transparent transparent}.tooltip:hover .tooltip-text{visibility:visible;opacity:1;transform:translateY(-5px)}.character-count,.word-count{font-size:.875rem;color:var(--text-muted);font-weight:500;margin-top:var(--spacing-sm);display:flex;align-items:center;gap:var(--spacing-xs)}.word-count:before{content:"📝"}.character-count:before{content:"🔢"}footer{text-align:center;margin-top:var(--spacing-2xl);padding:var(--spacing-xl) 0;border-top:1px solid var(--border-color);background:var(--bg-card);border-radius:var(--radius-xl)}footer p{color:var(--text-muted);font-size:.875rem;margin-bottom:var(--spacing-sm)}footer p:last-child{margin-bottom:0;font-weight:600;color:var(--text-color)}@media (max-width:768px){.container{padding:var(--spacing-lg) var(--spacing-md)}.header h1{font-size:2rem}.header p{font-size:1rem}.main-content{padding:var(--spacing-lg);border-radius:var(--radius-xl)}.tabs{flex-direction:column;gap:var(--spacing-xs)}.tab{text-align:center;padding:var(--spacing-md)}.card{padding:var(--spacing-lg)}.section-title{font-size:1.5rem}.button{width:100%;justify-content:center}.header-links{flex-direction:column;gap:var(--spacing-sm)}.header-link{text-align:center}}@media (max-width:480px){.header h1{font-size:1.75rem}.header p{font-size:.9rem}.tab{font-size:.8rem;padding:var(--spacing-sm) var(--spacing-md)}.form-label{font-size:.85rem}}.dark-mode-toggle{position:fixed;top:var(--spacing-lg);right:var(--spacing-lg);z-index:1000;padding:var(--spacing-md);border:none;background:var(--bg-card);border-radius:var(--radius-full);box-shadow:var(--shadow-lg);cursor:pointer;transition:all var(--transition-normal);border:1px solid var(--border-color)}.dark-mode-toggle:hover{transform:scale(1.1);box-shadow:var(--shadow-xl)}@keyframes slideInFromLeft{0%{opacity:0;transform:translateX(-50px)}to{opacity:1;transform:translateX(0)}}@keyframes slideInFromRight{0%{opacity:0;transform:translateX(50px)}to{opacity:1;transform:translateX(0)}}@keyframes scaleIn{0%{opacity:0;transform:scale(.9)}to{opacity:1;transform:scale(1)}}.form-group:first-child{animation:slideInFromLeft .6s ease-out .1s both}.form-group:nth-child(2){animation:slideInFromLeft .6s ease-out .2s both}.form-group:nth-child(3){animation:slideInFromLeft .6s ease-out .3s both}.button{animation:scaleIn .4s ease-out .4s both}@media (prefers-reduced-motion:reduce){*,:after,:before{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}:focus-visible{outline:2px solid var(--primary-color);outline-offset:2px;border-radius:var(--radius-sm)}@media (prefers-contrast:high){:root{--border-color:var(--neutral-400);--text-muted:var(--neutral-600)}}.button-group{display:flex;gap:var(--spacing-md);flex-wrap:wrap;align-items:center;margin-top:var(--spacing-lg)}.button-spinner{width:16px;height:16px;border:2px solid rgba(255,255,255,.3);border-top-color:white;border-radius:50%;animation:spin 1s linear infinite}.form-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));grid-gap:var(--spacing-lg);gap:var(--spacing-lg);margin-bottom:var(--spacing-lg)}.form-select{-webkit-appearance:none;-moz-appearance:none;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%236b7280'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'%3E%3C/path%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right var(--spacing-md) center;background-size:1rem;padding-right:var(--spacing-2xl)}.progress-bar{width:100%;height:8px;background:var(--bg-subtle);overflow:hidden;margin:var(--spacing-md) 0}.progress-bar,.progress-fill{border-radius:var(--radius-full)}.progress-fill{height:100%;background:linear-gradient(90deg,var(--primary-500),var(--secondary-500));transition:width var(--transition-normal);animation:shimmer 2s infinite}@keyframes shimmer{0%{background-position:-100% 0}to{background-position:100% 0}}.progress-text{font-size:.875rem;font-weight:600;color:var(--text-muted);text-align:center;margin-top:var(--spacing-sm)}.loading-indicator{text-align:center;animation:fadeIn .5s ease-out}.loading-indicator p{font-size:1.1rem;font-weight:500;color:var(--text-color);margin-bottom:var(--spacing-sm)}.error-message{position:relative;padding-right:var(--spacing-2xl)}.error-dismiss{position:absolute;top:var(--spacing-sm);right:var(--spacing-md);background:none;border:none;color:var(--error-600);cursor:pointer;font-size:1.25rem;font-weight:700;padding:var(--spacing-xs);border-radius:var(--radius-sm);transition:all var(--transition-fast)}.error-dismiss:hover{background:var(--error-100);color:var(--error-700)}.tab-panel{animation:slideIn .4s ease-out}.section-header{align-items:center;margin-bottom:var(--spacing-xl);padding-bottom:var(--spacing-md);border-bottom:2px solid var(--border-light)}.content-header,.section-header{display:flex;justify-content:space-between}.content-header{align-items:flex-start;margin-bottom:var(--spacing-lg);flex-wrap:wrap;gap:var(--spacing-md)}.content-stats,.questions-stats{display:flex;gap:var(--spacing-lg);align-items:center;flex-wrap:wrap}.content-stats 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