:root{--color-bg: #ffffff;--color-bg-subtle: #f7f7f5;--color-text: #191919;--color-text-light: #6b6b6b;--color-border: #e8e8e5;--color-border-dark: #d4d4d0;--color-accent: #2eaadc;--color-correct: #4dab6d;--color-incorrect: #eb5757;--color-hover: #f1f1ef}*{box-sizing:border-box}html,body,#root{margin:0;min-height:100%}body{background:var(--color-bg);color:var(--color-text);font-family:Inter,-apple-system,BlinkMacSystemFont,sans-serif;font-size:16px;line-height:1.6}a{color:inherit;text-decoration:none}p{margin:0}h1,h2,h3{margin:0;line-height:1.25}h1{font-size:30px;font-weight:700}h2{font-size:20px;font-weight:600}h3{font-size:17px;font-weight:600}.app-shell{min-height:100vh;background:radial-gradient(circle at top right,#fbfbfa,#fff 45%)}.page-container{max-width:720px;margin:0 auto;padding:48px 24px}.subtle{color:var(--color-text-light)}.stack-lg{display:flex;flex-direction:column;gap:24px}.card{border:1px solid var(--color-border);border-radius:8px;background:var(--color-bg);padding:24px}.card-clickable{cursor:pointer;transition:box-shadow .15s ease,background-color .15s ease}.card-clickable:hover{box-shadow:0 1px 3px #0000000a;background:var(--color-hover)}.form{margin-top:16px;display:flex;flex-direction:column;gap:20px}.field{display:flex;flex-direction:column;gap:6px}.field-label{font-size:14px;font-weight:500}.field-input,.field-textarea{width:100%;border:1px solid var(--color-border);border-radius:4px;padding:8px 12px;font:inherit;color:inherit;background:#fff}.field-input{height:40px}.field-textarea{min-height:280px;resize:vertical}.field-input:focus,.field-textarea:focus{border-color:var(--color-accent);outline:none}.field-input-error{border-color:var(--color-incorrect)}.field-error{margin:0;color:var(--color-incorrect);font-size:13px}.field-caption{font-size:13px;color:#999}.field-meta{display:flex;justify-content:space-between;gap:12px;align-items:center}.btn{min-height:40px;padding:8px 16px;border-radius:4px;border:1px solid transparent;font:inherit;font-size:14px;font-weight:500;cursor:pointer;transition:opacity .15s ease,background-color .15s ease}.btn:disabled{opacity:.4;cursor:not-allowed}.btn-primary{background:var(--color-text);color:#fff}.btn-primary:hover:not(:disabled){opacity:.85}.btn-secondary{background:transparent;color:var(--color-text);border-color:var(--color-border-dark)}.btn-secondary:hover:not(:disabled){background:var(--color-bg-subtle)}.btn-spinner,.spinner{width:16px;height:16px;border:2px solid rgba(255,255,255,.4);border-top-color:#fff;border-radius:50%;display:inline-block;animation:spin .8s linear infinite}.btn-secondary .btn-spinner{border:2px solid rgba(25,25,25,.2);border-top-color:var(--color-text)}.loading-wrap{min-height:240px;display:grid;place-content:center;gap:12px;text-align:center}.loading-wrap .spinner{justify-self:center;border:2px solid rgba(25,25,25,.2);border-top-color:var(--color-text)}@keyframes spin{to{transform:rotate(360deg)}}.app-header{border-bottom:1px solid var(--color-border);background:#ffffffe0;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);position:sticky;top:0;z-index:10}.app-header-inner{max-width:1100px;margin:0 auto;padding:12px 24px;display:flex;align-items:center;justify-content:space-between;gap:16px}.brand{font-weight:700;letter-spacing:.01em}.nav-links{display:flex;gap:16px;color:var(--color-text-light)}.nav-links a:hover{color:var(--color-text)}.header-user{display:flex;align-items:center;gap:12px}.hero{display:flex;flex-direction:column;gap:16px;border:1px solid var(--color-border);padding:40px;border-radius:12px;background:linear-gradient(145deg,#fff,#fbfbf9)}.hero-actions{display:flex;gap:12px}.auth-links{margin-top:16px;display:flex;gap:16px;font-size:14px;color:var(--color-text-light)}.auth-links a:hover{color:var(--color-text)}.security-question{padding:12px;border-radius:6px;background:var(--color-bg-subtle);border:1px solid var(--color-border)}.list-header{margin-bottom:12px;display:flex;justify-content:space-between;align-items:center}.history-list{display:flex;flex-direction:column;gap:12px}.history-row{display:flex;justify-content:space-between;align-items:center;gap:16px}.empty-state{border:1px dashed var(--color-border-dark);border-radius:8px;padding:24px;display:flex;flex-direction:column;gap:12px;align-items:flex-start;background:var(--color-bg-subtle)}.question-card{display:flex;flex-direction:column;gap:16px}.question-title{font-size:18px;font-weight:600}.options-list{display:grid;gap:10px}.option-button{min-height:44px;display:flex;align-items:center;gap:10px;text-align:left;width:100%;border:1px solid var(--color-border);border-radius:6px;padding:10px 12px;background:#fff;cursor:pointer}.option-button:hover{background:var(--color-hover)}.option-selected{border-color:var(--color-text);background:var(--color-bg-subtle)}.option-correct{border-left:4px solid var(--color-correct)}.option-incorrect{border-left:4px solid var(--color-incorrect)}.option-label{font-weight:600}.question-feedback{display:flex;flex-direction:column;gap:8px;padding-left:12px;border-left:2px solid var(--color-border);color:var(--color-text-light)}.results-layout{display:flex;flex-direction:column;gap:16px}.score-head{display:flex;justify-content:space-between;align-items:center;gap:16px}.score-badge{display:inline-flex;align-items:center;justify-content:center;min-width:64px;height:36px;border-radius:999px;border:1px solid var(--color-border-dark);background:var(--color-bg-subtle);font-weight:600}.toast-stack{position:fixed;top:20px;right:20px;width:min(360px,calc(100vw - 32px));display:flex;flex-direction:column;gap:10px;z-index:30}.toast{background:#fff;border:1px solid var(--color-border);border-left:4px solid var(--color-accent);border-radius:8px;padding:12px;box-shadow:0 8px 24px #0000000f;display:flex;justify-content:space-between;align-items:flex-start;gap:8px}.toast-success{border-left-color:var(--color-correct)}.toast-error{border-left-color:var(--color-incorrect)}.toast-info{border-left-color:var(--color-accent)}.toast-close{border:none;background:transparent;color:var(--color-text-light);font-size:20px;line-height:1;cursor:pointer}@media(max-width:768px){.page-container{padding:24px 16px}h1{font-size:26px}h2{font-size:19px}.app-header-inner{padding:10px 16px;flex-wrap:wrap}.nav-links{order:3;width:100%;justify-content:space-between}.hero{padding:24px}}