@import "https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;700&family=Quicksand:wght@400;500;600;700&display=swap";:root{--radius-xl:34px;--radius-lg:26px;--radius-md:18px;--radius-sm:14px;--sans:"Quicksand", "Segoe UI", sans-serif;--display:"Quicksand", "Segoe UI", sans-serif;--mono:"JetBrains Mono", Consolas, monospace;--transition-fast:.18s ease;--transition-base:.26s ease;color:var(--text);font-family:var(--sans);font-synthesis:none;text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-weight:500;line-height:1.5}:root,:root[data-theme=light]{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;--bg-top:#fdfefe;--bg:#edf3f8;--bg-accent-1:#006eff24;--bg-accent-2:#10b9811c;--bg-accent-3:#1e40af14;--pattern-opacity:.09;--pattern-size:210px auto;--surface:#ffffffc7;--surface-strong:#fffffff2;--surface-muted:#f3f6fce6;--surface-elevated:#ffffffe0;--surface-inline:#0f172a0b;--border:#0f172a1a;--border-strong:#0f172a2e;--text:#111;--text-muted:#434f62;--heading:#000;--accent:#155eef;--accent-strong:#0ea5e9;--accent-soft:#155eef1a;--accent-secondary:#10b981;--button-primary-text:#fff;--easy:#15803d;--medium:#d97706;--hard:#dc2626;--mastery-gold:#d4a017;--mastery-gold-strong:#f6d365;--mastery-gold-soft:#d4a01724;--mastery-gold-border:#b7860b61;--mastery-gold-shadow:0 20px 48px #d4a01724, 0 0 0 1px #f6d3651f;--success:#15803d;--warning:#d97706;--shadow:0 24px 60px #0f172a1a, 0 10px 24px #0f172a0d;--accent-glow:0 18px 36px #155eef33;--text-glow:none}:root[data-theme=dark]{--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark;--bg-top:#070b18;--bg:#02040c;--bg-accent-1:#36f3ff29;--bg-accent-2:#a8ff3e1f;--bg-accent-3:#ff2fda1f;--pattern-opacity:.13;--pattern-size:210px auto;--surface:#090e1cd1;--surface-strong:#0d1325f5;--surface-muted:#10182df5;--surface-elevated:#09101fe6;--surface-inline:#7de8ff1a;--border:#6de4ff2e;--border-strong:#a8ff3e57;--text:#f2fbff;--text-muted:#8ca9bf;--heading:#fff;--accent:#36f3ff;--accent-strong:#a8ff3e;--accent-soft:#36f3ff24;--accent-secondary:#ff2fda;--button-primary-text:#04111b;--easy:#5dff98;--medium:#ffc857;--hard:#ff5f8f;--mastery-gold:#ffd86b;--mastery-gold-strong:#fff2b2;--mastery-gold-soft:#ffd86b2e;--mastery-gold-border:#ffd86b6b;--mastery-gold-shadow:0 0 24px #ffd86b33, 0 0 72px #ffc10714;--success:#5dff98;--warning:#ffc857;--shadow:0 30px 90px #0000007a, 0 0 0 1px #36f3ff0a;--accent-glow:0 0 22px #36f3ff47, 0 0 56px #a8ff3e1f;--text-glow:0 0 26px #36f3ff1f}*,:before,:after{box-sizing:border-box}html{background:var(--bg)}body{min-width:320px;min-height:100vh;color:var(--text);background:radial-gradient(circle at top left, var(--bg-accent-1), transparent 32%), radial-gradient(circle at 84% 12%, var(--bg-accent-2), transparent 28%), radial-gradient(circle at 52% 100%, var(--bg-accent-3), transparent 34%), linear-gradient(180deg, var(--bg-top) 0%, var(--bg) 100%);transition:background var(--transition-base), color var(--transition-fast);margin:0;position:relative}body:before{content:"";background-image:url(/assets/leaf-bg-XOcXrHIP.png);background-repeat:repeat;background-size:var(--pattern-size);opacity:var(--pattern-opacity);pointer-events:none;z-index:0;background-position:0 0;position:fixed;inset:0}a{color:inherit}button,input,select,textarea{font:inherit}button{cursor:pointer}::selection{background:var(--accent-soft)}:focus-visible{outline:2px solid var(--accent);outline-offset:3px}#root{z-index:1;min-height:100vh;position:relative}h1,h2,h3,h4{letter-spacing:-.04em}p{line-height:1.65}.app-shell{width:min(1320px,100% - 32px);margin:0 auto;padding:20px 0 48px}.topbar{border:1px solid var(--border);border-radius:var(--radius-xl);background:linear-gradient(135deg, #ffffff14, transparent), linear-gradient(180deg, var(--surface-strong), var(--surface));box-shadow:var(--shadow);will-change:transform;grid-template-columns:minmax(0,320px) minmax(0,1fr) auto;align-items:center;gap:20px;margin-bottom:20px;padding:18px 22px;display:grid}.brand-mark{align-items:center;gap:12px;text-decoration:none;display:flex}.brand-mark__logo{object-fit:contain;flex:none;width:38px;height:38px}.brand-mark strong{color:var(--heading);font-family:var(--display);text-shadow:var(--text-glow);font-size:1.42rem;font-weight:700}.brand-mark__eyebrow,.eyebrow{color:var(--accent);font-family:var(--mono);letter-spacing:.14em;text-transform:uppercase;margin:0;font-size:.72rem;font-weight:500}.app-nav{flex-wrap:wrap;justify-content:center;align-items:center;gap:10px;display:flex}.app-nav__link,.theme-toggle{min-height:46px;transition:transform var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast), color var(--transition-fast);border:1px solid #0000;border-radius:999px;justify-content:center;align-items:center;padding:11px 16px;text-decoration:none;display:inline-flex}.app-nav__link{color:var(--text-muted)}.app-nav__link:hover,.app-nav__link:focus-visible{color:var(--heading);background:var(--surface-inline);border-color:var(--border);transform:translateY(-1px)}.app-nav__link--active{color:var(--heading);background:var(--accent-soft);border-color:var(--border);box-shadow:inset 0 0 0 1px #ffffff0f}.theme-toggle{border-color:var(--border);background:var(--surface-muted);color:var(--heading);gap:12px;margin-left:2px;box-shadow:inset 0 1px #ffffff14}.theme-toggle:hover,.theme-toggle:focus-visible{border-color:var(--border-strong);box-shadow:var(--accent-glow);transform:translateY(-1px)}.theme-toggle__label{letter-spacing:.02em;font-size:.92rem;font-weight:700}.theme-toggle__track{background:linear-gradient(135deg, #ffffff24, transparent), linear-gradient(135deg, var(--accent), var(--accent-strong));width:52px;height:28px;box-shadow:inset 0 0 0 1px #ffffff29, var(--accent-glow);border-radius:999px;align-items:center;padding:3px;display:inline-flex;position:relative}.theme-toggle__thumb{background:var(--surface-strong);width:22px;height:22px;transition:transform var(--transition-fast), background var(--transition-fast);border-radius:999px;transform:translate(0);box-shadow:0 6px 18px #0003,0 0 0 1px #ffffff1a}.theme-toggle[aria-pressed=true] .theme-toggle__thumb{transform:translate(24px)}.theme-toggle--footer{gap:10px;min-height:40px;margin-left:auto;padding:8px 12px}.theme-toggle--footer .theme-toggle__label{font-size:.84rem}.theme-toggle--footer .theme-toggle__track{width:46px;height:24px;padding:2px}.theme-toggle--footer .theme-toggle__thumb{width:20px;height:20px}.theme-toggle--footer[aria-pressed=true] .theme-toggle__thumb{transform:translate(22px)}.topbar__actions{flex-wrap:wrap;justify-content:flex-end;align-items:center;gap:10px;display:flex}.session-pill{border:1px solid var(--border);background:linear-gradient(135deg, #ffffff0d, transparent), var(--surface-muted);border-radius:20px;min-width:180px;max-width:260px;padding:12px 14px;box-shadow:inset 0 1px #ffffff14}.session-pill strong,.session-pill__eyebrow{display:block}.session-pill strong{text-overflow:ellipsis;white-space:nowrap;overflow:hidden}.session-pill__eyebrow{color:var(--text-muted);text-transform:uppercase;letter-spacing:.08em;margin-bottom:2px;font-size:.72rem}.page-shell{flex-direction:column;gap:20px;display:flex}.site-footer{color:var(--text-muted);justify-content:space-between;align-items:flex-end;gap:16px;margin-top:24px;padding:0 4px;font-size:.95rem;display:flex}.site-footer p{margin:0}.site-footer__copy{flex-direction:column;gap:8px;display:flex}.site-footer__links{flex-wrap:wrap;gap:14px;display:flex}.site-footer__links a{color:var(--heading);font-weight:700;text-decoration:none}.site-footer__links a:hover,.site-footer__links a:focus-visible{color:var(--accent);text-decoration:underline}.signup-prompt{color:var(--text-muted);margin:0;font-size:.9rem}.signup-prompt a{color:var(--heading);font-weight:700;text-decoration:none}.signup-prompt a:hover,.signup-prompt a:focus-visible{color:var(--accent);text-decoration:underline}.guest-lock-banner{justify-content:space-between;align-items:center;gap:12px;display:flex}.stack-page{flex-direction:column;gap:24px;display:flex}.stack-section{flex-direction:column;gap:18px;display:flex}.hero-panel,.content-card,.loading-panel,.auth-panel,.empty-state,.stat-card,.problem-card,.review-card,.assessment-card{border:1px solid var(--border);background:linear-gradient(135deg, #ffffff0f, transparent 48%), linear-gradient(180deg, var(--surface-strong), var(--surface));box-shadow:var(--shadow)}.hero-panel{background:radial-gradient(circle at top right, var(--accent-soft), transparent 34%), linear-gradient(135deg, #ffffff14, transparent 58%), linear-gradient(180deg, var(--surface-strong), var(--surface));border-radius:36px;flex-direction:column;gap:10px;padding:34px;display:flex}.hero-panel--compact{padding:28px}.hero-panel--mastery{border-color:var(--mastery-gold-border);background:radial-gradient(circle at top right, var(--mastery-gold-soft), transparent 34%), radial-gradient(circle at 18% 14%, #fff4b524, transparent 26%), linear-gradient(135deg, #ffe0821a, transparent 58%), linear-gradient(180deg, var(--surface-strong), var(--surface));box-shadow:var(--shadow), var(--mastery-gold-shadow)}.hero-panel__split{grid-template-columns:minmax(0,1.3fr) minmax(280px,.9fr);align-items:start;gap:24px;display:grid}.hero-panel__placeholder{visibility:hidden;pointer-events:none;border-radius:30px;min-height:248px}.hero-panel__status{flex-direction:column;align-self:stretch;gap:14px;display:flex}.home-hero__content{flex-direction:column;gap:20px;padding-block:10px;display:flex}.hero-panel h1,.section-heading h2,.content-card h3,.assessment-card h2,.empty-state h3,.auth-panel h1,.review-card h3,.loading-panel h1{color:var(--heading);font-family:var(--display);text-shadow:var(--text-glow);margin:0;line-height:1.02}.hero-panel h1,.auth-panel h1,.loading-panel h1{font-size:clamp(2.3rem,4vw,4.5rem)}.hero-panel p,.section-heading p,.content-card p,.assessment-card p,.auth-panel p,.loading-panel p,.empty-state p,.review-card p,.problem-card p{color:var(--text-muted);margin:0}.hero-panel__actions,.content-card__actions,.assessment-actions,.problem-detail__actions,.assessment-card__actions{flex-wrap:wrap;gap:12px;display:flex}.home-hero__content .hero-panel__actions{margin-top:4px}.button{letter-spacing:.01em;min-height:46px;transition:transform var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast), color var(--transition-fast);border:1px solid #0000;border-radius:15px;justify-content:center;align-items:center;padding:11px 18px;font-weight:700;text-decoration:none;display:inline-flex}.button:hover:not(:disabled),.button:focus-visible:not(:disabled){transform:translateY(-1px)}.button:disabled{opacity:.55;cursor:not-allowed}.button--small{min-height:36px;padding:7px 12px;font-size:.88rem}.button--primary{background:linear-gradient(135deg, var(--accent), var(--accent-strong));color:var(--button-primary-text);box-shadow:var(--accent-glow)}.button--primary:hover:not(:disabled),.button--primary:focus-visible:not(:disabled){filter:saturate(1.12)brightness(1.02)}.button--ghost{background:var(--surface-muted);border-color:var(--border);color:var(--heading);box-shadow:inset 0 1px #ffffff0f}.button--ghost:hover:not(:disabled),.button--ghost:focus-visible:not(:disabled){background:var(--surface-inline);border-color:var(--border-strong)}.stats-grid{grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:16px;display:grid}.assessment-session-strip{flex-direction:column;align-self:center;gap:12px;min-width:280px;display:flex}.assessment-session-strip__progress{grid-template-columns:auto minmax(0,1fr) auto;align-items:center;gap:10px;display:grid}.assessment-session-strip__progress-label{color:var(--text-muted);font-family:var(--mono);letter-spacing:.08em;text-transform:uppercase;font-size:.72rem}.assessment-session-strip__progress-track{background:var(--surface-inline);border-radius:999px;width:100%;height:8px;overflow:hidden}.assessment-session-strip__progress-fill{border-radius:inherit;background:linear-gradient(90deg, var(--accent), var(--accent-strong));height:100%;box-shadow:var(--accent-glow);display:block}.assessment-session-strip__progress-count{color:var(--heading);font-family:var(--mono);font-size:.9rem;font-weight:700}.assessment-session-strip__meta{color:var(--text-muted);justify-content:flex-end;align-items:center;gap:12px;font-size:.86rem;display:flex}.assessment-session-strip__timer{color:var(--heading);font-family:var(--mono);font-size:1.05rem;font-weight:700}.stat-card{background:linear-gradient(180deg, var(--surface-strong), var(--surface-muted));border-radius:24px;padding:18px}.stat-card__label,.stat-card__detail{margin:0}.stat-card__label{color:var(--text-muted);text-transform:uppercase;letter-spacing:.08em;font-size:.78rem;font-weight:700}.stat-card__value{color:var(--heading);font-family:var(--display);text-shadow:var(--text-glow);margin:10px 0 8px;font-size:2rem;display:block}.section-heading{justify-content:space-between;align-items:end;gap:20px;display:flex}.section-heading__action{align-items:center;display:flex}.section-heading h2{margin-bottom:8px;font-size:clamp(1.6rem,3vw,2.4rem)}.carousel-shell{flex-direction:column;gap:14px;display:flex}.carousel-shell__controls{justify-content:flex-end;align-items:center;gap:10px;display:flex}.carousel-shell__status{border:1px solid var(--border);min-width:76px;color:var(--text-muted);background:var(--surface-muted);font-family:var(--mono);text-align:center;border-radius:999px;margin:0;padding:10px 12px}.carousel-stage{grid-template-columns:minmax(0,.88fr) minmax(0,1.18fr) minmax(0,.88fr);align-items:stretch;gap:16px;display:grid}.carousel-stage:focus-visible{border-radius:28px}.quick-card{border:1px solid var(--border);background:radial-gradient(circle at top right, var(--accent-soft), transparent 38%), linear-gradient(180deg, var(--surface-strong), var(--surface));min-height:260px;box-shadow:var(--shadow);transition:transform var(--transition-base), opacity var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-fast);border-radius:30px;flex-direction:column;gap:14px;padding:24px;display:flex}.quick-card h3{color:var(--heading);text-shadow:var(--text-glow);margin:0;font-size:1.5rem}.quick-card__topline{justify-content:space-between;align-items:center;gap:10px;display:flex}.quick-card--active{border-color:var(--border-strong);box-shadow:var(--shadow), var(--accent-glow);transform:translateY(-4px)}.quick-card--preview{opacity:.68;transform:scale(.96)}.carousel-dots{justify-content:center;gap:8px;display:flex}.carousel-dot{background:var(--border-strong);width:10px;height:10px;transition:transform var(--transition-fast), background var(--transition-fast), width var(--transition-fast), box-shadow var(--transition-fast);border:0;border-radius:999px;padding:0}.carousel-dot:hover,.carousel-dot:focus-visible{transform:scale(1.1)}.carousel-dot--active{background:linear-gradient(90deg, var(--accent), var(--accent-strong));width:28px;box-shadow:var(--accent-glow)}.grid{gap:16px;display:grid}.grid--two{grid-template-columns:repeat(2,minmax(0,1fr))}.grid--three{grid-template-columns:repeat(3,minmax(0,1fr))}.content-card{border-radius:28px;flex-direction:column;gap:14px;padding:24px;display:flex}.content-card--mastery{border-color:var(--mastery-gold-border);background:radial-gradient(circle at top right, var(--mastery-gold-soft), transparent 42%), radial-gradient(circle at 14% 10%, #fff5bf1f, transparent 22%), linear-gradient(135deg, #ffdc7814, transparent 52%), linear-gradient(180deg, var(--surface-strong), var(--surface));box-shadow:var(--shadow), var(--mastery-gold-shadow)}.content-card--mastery .eyebrow,.hero-panel--mastery .eyebrow{color:var(--mastery-gold)}.content-card--mastery .pill,.hero-panel--mastery .pill{border-color:var(--mastery-gold-border);color:color-mix(in srgb, var(--mastery-gold-strong) 55%, var(--heading));background:#ffe0821f}.content-card--mastery .progress-bar,.hero-panel--mastery .progress-bar{background:#ffe0821f;border:1px solid #ffe0821a}.content-card--mastery .progress-bar span,.hero-panel--mastery .progress-bar span{background:linear-gradient(90deg, var(--mastery-gold), var(--mastery-gold-strong));box-shadow:0 0 18px #ffd70038,0 0 36px #f6d36524}.content-card--compact{min-height:220px}.tag-cluster{flex-wrap:wrap;gap:8px;display:flex}.pill{background:var(--surface-inline);min-height:30px;color:var(--heading);white-space:nowrap;border:1px solid #0000;border-radius:999px;align-items:center;gap:6px;padding:6px 12px;font-size:.86rem;font-weight:700;display:inline-flex}.pill--easy,.pill--success{color:var(--easy);background:#15803d1f;border-color:#15803d2e}.pill--medium,.pill--warning{color:var(--medium);background:#d977061f;border-color:#d9770629}.pill--hard{color:var(--hard);background:#dc26261f;border-color:#dc262629}:root[data-theme=dark] .pill--easy,:root[data-theme=dark] .pill--success{background:#5dff981f;border-color:#5dff982e}:root[data-theme=dark] .pill--medium,:root[data-theme=dark] .pill--warning{background:#ffc85724;border-color:#ffc8572e}:root[data-theme=dark] .pill--hard{background:#ff5f8f24;border-color:#ff5f8f33}.filter-panel{border:1px solid var(--border);background:linear-gradient(180deg, var(--surface-strong), var(--surface));box-shadow:var(--shadow);border-radius:26px;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;padding:20px;display:grid}.filter-panel__actions{flex-wrap:wrap;align-items:end;gap:10px;display:flex}.field{flex-direction:column;gap:8px;display:flex}.field span{color:var(--text-muted);letter-spacing:.08em;text-transform:uppercase;font-size:.82rem;font-weight:700}.field input,.field select{border:1px solid var(--border);background:var(--surface-strong);min-height:48px;color:var(--heading);transition:border-color var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);border-radius:16px;padding:10px 14px;box-shadow:inset 0 1px #ffffff14}.field input::placeholder{color:var(--text-muted)}.field input:focus,.field select:focus{border-color:var(--accent);box-shadow:0 0 0 4px var(--accent-soft), inset 0 1px 0 #ffffff14}.table-shell{flex-direction:column;gap:18px;display:flex}.pagination-bar{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px;display:flex}.pagination-bar__summary{color:var(--text-muted);margin:0;font-size:.96rem}.pagination-bar__controls,.pagination-bar__pages{flex-wrap:wrap;align-items:center;gap:10px;display:flex}.pagination-bar__page{border:1px solid var(--border);background:var(--surface-strong);min-width:42px;min-height:42px;color:var(--heading);box-shadow:var(--shadow);transition:transform var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast), color var(--transition-fast), box-shadow var(--transition-fast);border-radius:999px;padding:0 12px}.pagination-bar__page:hover,.pagination-bar__page:focus-visible{border-color:var(--accent);color:var(--accent);transform:translateY(-1px)}.pagination-bar__page--active{background:linear-gradient(135deg, var(--accent), var(--accent-strong));color:var(--button-primary-text);box-shadow:var(--accent-glow);border-color:#0000}.pagination-bar__page--active:hover,.pagination-bar__page--active:focus-visible{color:var(--button-primary-text)}.problem-table{border-collapse:collapse;border:1px solid var(--border);background:linear-gradient(180deg, var(--surface-strong), var(--surface));width:100%;box-shadow:var(--shadow);border-radius:24px;overflow:hidden}.problem-table th,.problem-table td{text-align:left;border-bottom:1px solid var(--border);vertical-align:top;padding:16px}.problem-table th{color:var(--text-muted);background:var(--surface-muted);text-transform:uppercase;letter-spacing:.1em;font-size:.78rem;font-weight:700}.problem-table__sort{width:100%;color:inherit;font:inherit;font-weight:inherit;letter-spacing:inherit;text-align:left;text-transform:inherit;background:0 0;border:0;justify-content:space-between;align-items:center;gap:8px;padding:0;display:inline-flex}.problem-table__sort:hover,.problem-table__sort:focus-visible{color:var(--accent)}.problem-table__sort-indicator{color:var(--text-muted);font-size:.82rem}.problem-table tbody tr:hover{background:var(--accent-soft)}.problem-table tbody tr:last-child td{border-bottom:0}.problem-table__title{color:var(--heading);font-weight:700;text-decoration:none}.problem-table__title:hover,.problem-table__title:focus-visible{color:var(--accent)}.problem-table__track,.problem-card__meta,.problem-card__footer{color:var(--text-muted);margin-top:6px;font-size:.92rem;display:block}.problem-cards{gap:16px;display:none}.problem-card{border-radius:24px;padding:22px}.problem-card__header{justify-content:space-between;gap:16px;display:flex}.problem-detail{grid-template-columns:minmax(0,1.45fr) minmax(280px,.85fr);gap:18px;display:grid}.problem-detail__prompt,.assessment-card__prompt{color:var(--heading);font-size:1.08rem;line-height:1.7}.sidebar-stack{flex-direction:column;gap:16px;display:flex}.link-stack{flex-direction:column;gap:10px;display:flex}.study-step-problem{grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:12px;display:grid}.link-stack a,.auth-switch a{color:var(--heading);font-weight:700;text-decoration:none}.link-stack a:hover,.link-stack a:focus-visible,.auth-switch a:hover,.auth-switch a:focus-visible{color:var(--accent);text-decoration:underline}.answer-list{flex-direction:column;gap:12px;display:flex}.answer-option{border:1px solid var(--border);background:var(--surface-muted);text-align:left;transition:border-color var(--transition-fast), background var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);border-radius:18px;grid-template-columns:36px minmax(0,1fr);align-items:center;gap:14px;padding:14px 16px;display:grid}.answer-option:hover,.answer-option:focus-visible{border-color:var(--border-strong);transform:translateY(-1px)}.answer-option span{background:var(--surface-inline);width:36px;height:36px;color:var(--heading);font-family:var(--mono);border-radius:999px;justify-content:center;align-items:center;font-weight:700;display:inline-flex}.answer-option strong{color:var(--heading)}.answer-option--selected{border-color:var(--accent);background:var(--accent-soft);box-shadow:inset 0 0 0 1px #ffffff0f}.answer-option--correct{background:#15803d1f;border-color:#15803d4d}.answer-option--incorrect{background:#dc262614;border-color:#dc26263d}.feedback-panel{border:1px solid var(--border);border-radius:20px;padding:18px}.feedback-panel--correct{background:#15803d1f}.feedback-panel--incorrect{background:#d977061f}.assessment-layout,.assessment-summary{flex-direction:column;gap:20px;display:flex}.assessment-summary-hero{position:relative;overflow:hidden}.celebration-message{color:var(--heading);margin-top:12px;font-weight:700;line-height:1.5}.confetti-layer{pointer-events:none;position:absolute;inset:0;overflow:hidden}.confetti-piece{opacity:0;border-radius:3px;animation-name:confetti-fall;animation-timing-function:cubic-bezier(.2,.7,.3,1);animation-fill-mode:forwards;position:absolute;top:-20px}@keyframes confetti-fall{0%{opacity:1;transform:translateY(-20px)rotate(0)}to{opacity:0;transform:translateY(420px)rotate(620deg)}}.resume-banner{border:1px solid var(--border);background:linear-gradient(90deg, var(--accent-soft), transparent 80%), var(--surface-muted);color:var(--heading);border-radius:18px;padding:14px 18px}.resume-banner p{margin:0}.assessment-frame{display:block}.assessment-card{border-radius:28px;flex-direction:column;gap:18px;padding:24px;display:flex}.assessment-card__header,.review-card__header{justify-content:space-between;gap:18px;display:flex}.assessment-nav{justify-content:space-between;align-items:center;gap:12px;display:flex}.assessment-nav__pager{align-items:center;gap:10px;display:inline-flex}.assessment-nav__control{min-width:40px;min-height:36px;padding:6px 10px}.assessment-nav__index{min-width:86px;color:var(--heading);font-family:var(--mono);text-align:center;font-size:.94rem;font-weight:700}.submit-dialog-backdrop{z-index:40;-webkit-backdrop-filter:blur(3px);backdrop-filter:blur(3px);background:#02061494;justify-content:center;align-items:center;padding:18px;display:flex;position:fixed;inset:0}.submit-dialog{border:1px solid var(--border);background:linear-gradient(135deg, #ffffff0f, transparent 48%), linear-gradient(180deg, var(--surface-strong), var(--surface));width:min(460px,100%);box-shadow:var(--shadow);border-radius:24px;padding:22px}.submit-dialog h2{color:var(--heading);font-family:var(--display);margin:0 0 6px}.submit-dialog p{color:var(--text-muted);margin:0}.submit-dialog__stats{gap:6px;margin-top:14px;display:grid}.submit-dialog__stats p{color:var(--heading);font-weight:700}.submit-dialog__actions{flex-wrap:wrap;justify-content:flex-end;gap:10px;margin-top:16px;display:flex}.review-grid{grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:16px;display:grid}.review-card{border-radius:24px;flex-direction:column;gap:14px;padding:22px;display:flex}.auth-panel{border-radius:30px;flex-direction:column;gap:18px;padding:30px;display:flex}.auth-form{gap:14px;display:grid}.provider-stack,.loading-panel,.empty-state{flex-direction:column;gap:14px;display:flex}.not-found-page{text-align:center;flex-direction:column;justify-content:center;align-items:center;gap:8px;min-height:60vh;padding:40px 20px;display:flex}.not-found-page__code{font-family:var(--display);color:var(--accent);text-shadow:var(--text-glow);margin:0;font-size:clamp(6rem,18vw,12rem);font-weight:700;line-height:1}.not-found-page__message{color:var(--text-muted);margin:0 0 16px;font-size:1.15rem}.provider-grid{grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:10px;display:grid}.form-error{color:var(--hard);margin:0;font-weight:700}.auth-switch{margin:0}.auth-forgot{margin:-4px 0 0}.link-button{color:var(--text-muted);font:inherit;cursor:pointer;background:0 0;border:none;padding:0;font-size:.92rem;text-decoration:none}.link-button:hover,.link-button:focus-visible{color:var(--accent);text-decoration:underline}.progress-list{flex-direction:column;gap:14px;display:flex}.progress-row{grid-template-columns:minmax(0,180px) minmax(0,1fr);align-items:center;gap:16px;display:grid}.progress-row strong{color:var(--heading)}.progress-row p{margin:4px 0 0}.progress-meter{flex-direction:column;gap:10px;display:flex}.progress-meter__meta{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:10px;display:flex}.progress-meter__meta strong{color:var(--heading)}.progress-meter__meta span{color:var(--text-muted);font-size:.92rem}.progress-meter--compact{gap:8px}.progress-bar{background:var(--surface-inline);border-radius:999px;width:100%;height:14px;overflow:hidden}.progress-bar--compact{height:10px}.progress-bar span{border-radius:inherit;background:linear-gradient(90deg, var(--accent), var(--accent-strong));height:100%;box-shadow:var(--accent-glow);display:block}.loading-panel,.empty-state{text-align:left;border-radius:28px;padding:30px}@media (width<=1120px){.topbar{grid-template-columns:1fr}.app-nav,.topbar__actions{justify-content:flex-start}.hero-panel__split,.problem-detail,.assessment-frame{grid-template-columns:1fr}.hero-panel__placeholder{min-height:0;display:none}.grid--three,.filter-panel{grid-template-columns:repeat(2,minmax(0,1fr))}}@media (width<=780px){.app-shell{width:min(100%,100% - 20px);padding-top:10px}.topbar{padding:16px}.grid--two,.grid--three,.stats-grid,.progress-row,.filter-panel{grid-template-columns:1fr}.pagination-bar,.pagination-bar__controls{align-items:stretch}.pagination-bar__controls{justify-content:space-between;width:100%}.pagination-bar__pages{justify-content:center}.problem-table{display:none}.problem-cards{display:grid}.carousel-stage{grid-template-columns:1fr}.quick-card--preview{display:none}.study-step-problem{grid-template-columns:1fr;align-items:start;gap:8px}.study-step-problem .pill{justify-self:start}.assessment-session-strip{width:100%;min-width:0}.assessment-session-strip__meta{flex-wrap:wrap;justify-content:flex-start}.assessment-nav{flex-wrap:wrap}.guest-lock-banner{flex-direction:column;align-items:flex-start}}@media (width<=560px){.hero-panel,.content-card,.assessment-card,.auth-panel,.loading-panel,.empty-state,.stat-card{border-radius:24px;padding:20px}.hero-panel h1,.auth-panel h1,.loading-panel h1{font-size:2.1rem}.app-nav{width:100%}.app-nav__link{flex:calc(50% - 10px)}.topbar__actions,.hero-panel__actions,.content-card__actions,.assessment-card__actions,.assessment-actions,.topbar__actions>*,.hero-panel__actions>*,.content-card__actions>*,.assessment-card__actions>*,.assessment-actions>*,.problem-detail__actions>*{width:100%}.carousel-shell__controls{justify-content:space-between}.pagination-bar__controls{flex-direction:column;align-items:stretch}.pagination-bar__pages{width:100%}.pagination-bar__page{flex:42px}.site-footer{flex-direction:column;align-items:stretch}.theme-toggle--footer{justify-content:space-between;align-self:flex-end;width:fit-content;max-width:100%}.submit-dialog__actions{justify-content:stretch;width:100%}.submit-dialog__actions .button{flex:100%}}