:root{--surface-1: #0c0f14;--surface-2: #121720;--surface-3: #18202c;--surface-4: #202b3b;--bg-main: var(--surface-1);--bg-base: var(--surface-1);--bg-subtle: var(--surface-2);--bg-surface: var(--surface-2);--bg-surface-hover: var(--surface-3);--bg-card: var(--surface-2);--bg-card-hover: var(--surface-3);--bg-panel: var(--surface-2);--bg-elevated: var(--surface-4);--bg-input: #090d13;--bg-media: #070a0f;--text-1: #f1f5f9;--text-2: #b4c2d8;--text-3: #8c9eb4;--text-inverted: #0c0f14;--text-main: var(--text-1);--text-primary: var(--text-1);--text-muted: var(--text-2);--text-secondary: var(--text-2);--text-dim: var(--text-3);--text-tertiary: var(--text-3);--border-color: rgba(255, 255, 255, .08);--border-default: rgba(255, 255, 255, .08);--border-subtle: rgba(255, 255, 255, .05);--border-strong: rgba(255, 255, 255, .16);--border-hover: rgba(255, 255, 255, .16);--border-focus: #f06454;--accent-coral: #f06454;--accent-coral-hover: #e05343;--accent-coral-active: #cc4536;--accent-coral-subtle: rgba(240, 100, 84, .1);--accent-coral-border: rgba(240, 100, 84, .35);--accent-coral-glow: rgba(240, 100, 84, .2);--accent: var(--accent-coral);--accent-subtle: var(--accent-coral-subtle);--accent-border: var(--accent-coral-border);--accent-hover: var(--accent-coral-hover);--accent-active: var(--accent-coral-active);--accent-cyan: var(--accent-coral);--accent-blue: var(--accent-coral);--accent-blue-hover: var(--accent-coral-hover);--color-success: #22c55e;--color-warning: #f59e0b;--color-error: #fa5e5e;--accent-green: var(--color-success);--accent-green-subtle: rgba(34, 197, 94, .12);--accent-green-border: rgba(34, 197, 94, .32);--accent-amber: var(--color-warning);--accent-amber-subtle: rgba(245, 158, 11, .12);--accent-amber-border: rgba(245, 158, 11, .32);--accent-red: var(--color-error);--accent-red-subtle: rgba(239, 68, 68, .12);--accent-red-border: rgba(239, 68, 68, .32);--radius-control: 10px;--radius-card: 16px;--radius-pill: 999px;--radius-sm: var(--radius-control);--radius-md: var(--radius-control);--radius-lg: var(--radius-card);--space-1: 4px;--space-2: 8px;--space-3: 12px;--space-4: 16px;--space-5: 20px;--space-6: 24px;--space-7: 28px;--space-8: 32px;--space-9: 36px;--space-10: 40px;--space-11: 44px;--space-12: 48px;--ease-out: cubic-bezier(.23, 1, .32, 1);--ease-in-out: cubic-bezier(.77, 0, .175, 1);--dur-press: .14s;--dur-fast: .18s;--dur-base: .24s;--dur-slow: .42s;--z-base: 1;--z-header: 100;--z-dropdown: 200;--z-modal-backdrop: 500;--z-modal: 510;--z-overlay: 600;--z-skip-link: 1000;--font-sans: "Geist Variable", "Geist", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, system-ui, sans-serif;--font-mono: "Geist Mono Variable", "Geist Mono", ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;--font-base: var(--font-sans);--text-xs: .75rem;--text-sm: .875rem;--text-base: 1rem;--text-lg: 1.125rem;--text-xl: 1.375rem;--text-2xl: 1.75rem;--text-3xl: 2.25rem;--w-page: 1120px;--w-reading: 880px;--max-w-content: var(--w-page);--nav-height: 60px;--shadow-subtle: 0 1px 2px rgba(8, 11, 16, .4), 0 2px 8px rgba(8, 11, 16, .25);--shadow-card: 0 4px 16px rgba(8, 11, 16, .5), 0 1px 3px rgba(8, 11, 16, .3);--shadow-elevated: 0 12px 32px rgba(8, 11, 16, .65), 0 2px 6px rgba(8, 11, 16, .35);--skeleton-bg: var(--surface-3)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html,body{width:100%;min-height:100dvh;background-color:var(--surface-1);color:var(--text-1);font-family:var(--font-sans);font-size:16px;line-height:1.6;letter-spacing:-.01em;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;scroll-padding-top:80px;scroll-padding-bottom:80px}[data-testid]{scroll-margin-top:80px;scroll-margin-bottom:80px}@media (max-width: 767px){html,body,.study-main{scroll-padding-top:140px;scroll-padding-bottom:90px}[data-testid]{scroll-margin-top:140px;scroll-margin-bottom:90px}}body{display:flex;flex-direction:column}#study-app{display:flex;flex-direction:column;min-height:100dvh;width:100%;overflow-x:clip}.skip-link{position:absolute;top:-9999px;left:16px;background:var(--accent-coral);color:var(--text-inverted);padding:8px 16px;font-weight:700;border-radius:var(--radius-control);z-index:var(--z-skip-link);text-decoration:none;box-shadow:var(--shadow-elevated)}.skip-link:focus{top:16px;outline:2px solid #ffffff;outline-offset:2px}:focus-visible{outline:2px solid var(--accent-coral)!important;outline-offset:2px!important}main[tabindex="-1"]:focus,main[tabindex="-1"]:focus-visible,.study-main:focus,.study-main:focus-visible{outline:none!important}button:active:not(:disabled),.btn:active:not(:disabled),.btn-google:active:not(:disabled){transform:translateY(1px)}code,kbd,samp,pre,.meta-value-mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}@media (prefers-reduced-motion: reduce){*,*:before,*:after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important;scroll-behavior:auto!important}}@media (prefers-reduced-transparency: reduce){.study-header{background:var(--surface-1)!important;backdrop-filter:none!important;-webkit-backdrop-filter:none!important}}.study-header{background:#0c0f14f0;backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--border-color);position:sticky;top:0;z-index:var(--z-header);width:100%;height:60px;max-height:64px;display:flex;align-items:center;transition:border-color var(--dur-fast) var(--ease-out)}.nav-container{max-width:var(--max-w-content);width:100%;margin:0 auto;padding:0 var(--space-6);display:flex;align-items:center;justify-content:space-between;gap:var(--space-4);height:100%}.brand-link{font-size:1.15rem;font-weight:700;color:var(--text-1);text-decoration:none;display:inline-flex;align-items:center;min-height:32px;gap:10px;letter-spacing:-.02em;flex-shrink:0}.brand-link:hover{color:#fff}.brand-logo{width:28px;height:28px;display:block;flex-shrink:0;object-fit:contain}.brand-badge{font-size:.72rem;background:var(--accent-coral-subtle);color:var(--accent-coral);border:1px solid var(--accent-coral-border);padding:2px 7px;border-radius:var(--radius-pill);font-weight:700;letter-spacing:.05em;text-transform:uppercase}.study-nav{display:flex;align-items:center;gap:var(--space-2);height:100%}.nav-link{color:var(--text-2);text-decoration:none;font-size:.9rem;font-weight:500;padding:0 var(--space-3);min-height:28px;height:100%;display:inline-flex;align-items:center;border-bottom:2px solid transparent;transition:color var(--dur-fast),border-color var(--dur-fast);white-space:nowrap}.nav-link:hover{color:var(--text-1)}.nav-link.active,.nav-link[aria-current=page]{color:var(--text-1);background:transparent;border-bottom:2px solid var(--accent-coral);font-weight:600}@media (min-width: 768px) and (max-width: 940px){.nav-container{padding:0 16px;gap:12px}.brand-link{gap:8px}.study-nav{gap:4px}.nav-link{padding:0 8px;font-size:.86rem}}@media (max-width: 767px){.study-header{height:auto;max-height:none;padding:6px 0}.nav-container{flex-direction:column;align-items:stretch;gap:4px;padding:0 8px;height:auto}.brand-link{min-height:32px;font-size:1.05rem}.study-nav{display:flex;flex-wrap:wrap;overflow-x:visible;scroll-snap-type:none;gap:4px;padding-bottom:0;height:auto}.study-nav::-webkit-scrollbar{display:none}.nav-link{flex-shrink:0;min-height:32px;height:32px;padding:0 6px;font-size:.8125rem;border-radius:var(--radius-control);text-align:center;justify-content:center}@media (max-width: 520px){.study-nav{display:grid;grid-template-columns:repeat(4,1fr);gap:4px;width:100%}.study-nav .nav-link{padding:0 2px;font-size:.775rem}}.nav-link.active,.nav-link[aria-current=page]{background:var(--surface-3)}}.study-main{flex:1;max-width:var(--max-w-content);width:100%;margin:0 auto;padding:28px 24px 90px;outline:none;box-sizing:border-box;scroll-margin-top:80px;scroll-padding-top:80px;scroll-padding-bottom:90px}#study-notice-slot:empty{display:none!important}main:focus,.study-main:focus{outline:none}.redirect-notice{background:var(--accent-amber-subtle);border:1px solid var(--accent-amber-border);color:#fde68a;padding:14px 18px;border-radius:var(--radius-md);margin-bottom:24px;font-size:.92rem;display:flex;align-items:center;gap:12px;line-height:1.45;box-shadow:0 2px 8px #0003}.redirect-notice svg{color:var(--accent-amber);flex-shrink:0}.session-loading{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:80px 16px;color:var(--text-muted);gap:16px}.spinner{width:38px;height:38px;border:3px solid rgba(255,255,255,.08);border-top-color:var(--accent-coral);border-radius:50%;animation:spin .75s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.card{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-md);padding:24px;margin-bottom:20px;box-shadow:0 4px 20px #0000004d;transition:border-color .2s ease,box-shadow .2s ease}.page-title{font-size:1.6rem;font-weight:700;letter-spacing:-.02em;margin-bottom:6px;color:var(--text-main);line-height:1.25}.page-subtitle{color:var(--text-muted);font-size:.95rem;line-height:1.55;margin-bottom:24px}.text-center{text-align:center}.auth-container{max-width:420px;width:100%;margin:var(--space-8) auto;background:var(--surface-2);border:1px solid var(--border-color);border-radius:var(--radius-card);padding:var(--space-8) var(--space-6);box-shadow:var(--shadow-elevated);box-sizing:border-box}.auth-header{text-align:center;margin-bottom:var(--space-6)}.auth-header .page-title{margin-bottom:var(--space-2)}.auth-header .page-subtitle{margin-bottom:0}.auth-tabs{display:flex;background:var(--surface-1);padding:4px;border-radius:var(--radius-control);margin-bottom:var(--space-5);border:1px solid var(--border-color)}.auth-tab{flex:1;padding:8px 12px;background:transparent;border:none;color:var(--text-2);font-size:.88rem;font-weight:600;border-radius:var(--radius-control);cursor:pointer;transition:all var(--dur-fast)}.auth-tab.active{background:var(--surface-2);color:var(--text-1);box-shadow:var(--shadow-subtle)}.btn-google{width:100%;min-height:44px;background:var(--surface-3);color:var(--text-1);border:1px solid var(--border-color);padding:10px 16px;font-weight:600;font-size:.92rem;border-radius:var(--radius-control);display:flex;align-items:center;justify-content:center;gap:var(--space-3);cursor:pointer;transition:background-color var(--dur-fast),border-color var(--dur-fast),transform var(--dur-press)}.auth-submit-btn,.auth-container .btn-primary{width:100%;min-height:44px;display:inline-flex;align-items:center;justify-content:center;border-radius:var(--radius-control);box-sizing:border-box}.btn-google:hover:not(:disabled){background:var(--surface-4);border-color:var(--border-strong);color:#fff}.auth-divider{display:flex;align-items:center;text-align:center;margin:var(--space-5) 0;color:var(--text-3);font-size:.8rem}.auth-divider:before,.auth-divider:after{content:"";flex:1;border-bottom:1px solid var(--border-subtle)}.auth-divider span{padding:0 var(--space-3);text-transform:uppercase;letter-spacing:.05em;font-size:.75rem}.form-group{margin-bottom:var(--space-4);display:flex;flex-direction:column}.form-label{display:block;font-size:.88rem;font-weight:500;margin-bottom:var(--space-1);color:var(--text-2)}.form-input{background:var(--surface-1);border:1px solid var(--border-color);border-radius:var(--radius-control);padding:11px 14px;color:var(--text-1);font-size:.95rem;min-height:44px;outline:none;transition:border-color var(--dur-fast),box-shadow var(--dur-fast);width:100%;box-sizing:border-box}.form-input::placeholder{color:var(--text-3);opacity:1}.form-input:focus{border-color:var(--accent-coral);box-shadow:0 0 0 2px var(--accent-coral-subtle)}.form-hint{font-size:.8rem;color:var(--text-2);margin-top:var(--space-1);line-height:1.4}.form-checkbox-label{display:flex;align-items:flex-start;gap:var(--space-3);font-size:.88rem;color:var(--text-2);cursor:pointer;margin-top:var(--space-1);line-height:1.45}.form-checkbox-label input[type=checkbox]{margin-top:3px;accent-color:var(--accent-coral);width:18px;height:18px;flex-shrink:0;cursor:pointer}.form-checkbox-label a{color:var(--accent-coral);text-decoration:underline;text-underline-offset:3px;white-space:nowrap}.auth-error{background:var(--accent-red-subtle);border:1px solid var(--accent-red-border);color:#fca5a5;padding:12px 14px;border-radius:var(--radius-control);font-size:.88rem;margin-bottom:var(--space-4);line-height:1.45}.auth-info{background:var(--accent-coral-subtle);border:1px solid var(--accent-coral-border);color:#fecdd3;padding:12px 14px;border-radius:var(--radius-control);font-size:.88rem;margin-bottom:var(--space-4);line-height:1.45}[data-mode=signin] .signup-only,[data-mode=signup] .signin-only{display:none!important}.auth-forgot-row{text-align:right;margin-top:var(--space-2);margin-bottom:var(--space-4)}.auth-toggle-container{text-align:center;margin-top:var(--space-6);padding-top:var(--space-4);border-top:1px solid var(--border-subtle)}.auth-signout-btn{display:inline-flex;align-items:center;justify-content:center;margin:var(--space-4) auto 0;font-size:.85rem;color:var(--text-3);text-align:center;min-height:28px}@media (max-width: 820px){.auth-signout-btn{min-height:40px;padding:8px 16px}}.verify-instructions{margin-bottom:var(--space-3)}.verify-email-box{font-size:1.05rem;font-weight:700;font-family:var(--font-mono);font-variant-numeric:tabular-nums;color:var(--text-1);background:var(--surface-1);padding:var(--space-3) var(--space-4);border-radius:var(--radius-control);border:1px solid var(--border-color);margin-bottom:var(--space-4);word-break:break-all}.verify-spam-notice{font-size:.85rem;color:var(--text-2);margin-bottom:var(--space-6)}.actions-row,.question-actions-bar,.practice-actions-bar,.result-actions-row,.result-actions,.feedback-actions,.exhausted-actions,.hero-actions,.history-empty-actions,.selection-actions,.dialog-actions,.exam-dialog-actions,.delete-dialog-actions{display:flex;align-items:center;gap:var(--space-3);flex-wrap:wrap;margin-top:var(--space-6)}@media (max-width: 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#0009;padding:24px}.verify-actions{display:flex;flex-direction:column;gap:var(--space-3);margin-top:var(--space-6)}.btn{display:inline-flex;align-items:center;justify-content:center;text-decoration:none!important;cursor:pointer;border-radius:var(--radius-control);font-family:inherit;font-weight:600;border:1px solid transparent;min-height:28px;transition:background-color var(--dur-fast),border-color var(--dur-fast),color var(--dur-fast),transform var(--dur-press);box-sizing:border-box;line-height:1.4}@media (max-width: 820px){.btn{min-height:40px}}.btn-primary{background:var(--accent-coral);color:var(--text-inverted);border:1px solid rgba(0,0,0,.12);padding:10px 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14px;border-radius:var(--radius-sm)}.btn-ghost:hover:not(:disabled){color:var(--text-main);background:#ffffff0d;border-color:var(--border-strong)}.btn-outline{background:transparent;color:var(--accent-coral);border:1px solid var(--accent-coral);padding:8px 16px;border-radius:var(--radius-sm)}.btn-outline:hover:not(:disabled){background:var(--accent-coral-subtle)}.btn-link{background:none;border:none;color:var(--accent-coral);font-size:.88rem;cursor:pointer;padding:4px 8px;text-align:left;text-decoration:underline;text-underline-offset:3px;font-weight:500;min-height:28px;box-sizing:border-box;display:inline-flex;align-items:center}@media (max-width: 820px){.btn-link{min-height:40px;padding:8px 12px}}.btn-link:hover{color:var(--accent-coral-hover)}.btn-danger{background:var(--accent-red-subtle);color:#fca5a5;border:1px solid var(--accent-red-border);border-radius:var(--radius-sm);padding:9px 16px;font-size:.9rem;font-weight:600;cursor:pointer;transition:background-color .15s,border-color .15s}.btn-danger:hover{background:#ef444438;border-color:#ef444480}.btn-sm{padding:6px 12px;font-size:.82rem;min-height:28px}@media (max-width: 820px){.btn-sm{min-height:40px;padding:8px 14px;font-size:.875rem}}.btn-lg{padding:12px 24px;font-size:1rem}.btn-google:disabled,.btn-secondary:disabled,.btn:disabled:not(.btn-primary){background:var(--surface-3);color:var(--text-2);border:1px solid var(--border-color);opacity:.65;cursor:not-allowed;transform:none!important;box-shadow:none!important}.alert-box{padding:12px 16px;border-radius:var(--radius-sm);margin-bottom:16px;font-size:.9rem;display:flex;align-items:center;justify-content:space-between;gap:12px;line-height:1.45}.error-box{background:var(--accent-red-subtle);border:1px solid var(--accent-red-border);color:#fca5a5}.warning-box{background:var(--accent-amber-subtle);border:1px solid var(--accent-amber-border);color:#fde68a}.info-box{background:var(--accent-coral-subtle);border:1px solid var(--accent-coral-border);color:#fecdd3}.success-box{background:var(--accent-green-subtle);border:1px solid var(--accent-green-border);color:#86efac}.info-text{color:var(--text-muted);font-size:.88rem;line-height:1.5}.badge{display:inline-flex;align-items:center;padding:4px 10px;border-radius:4px;font-size:.78rem;font-weight:600;letter-spacing:.03em}.badge-success{background:var(--accent-green-subtle);color:#86efac;border:1px solid var(--accent-green-border)}.badge-error{background:var(--accent-red-subtle);color:#fca5a5;border:1px solid var(--accent-red-border)}.mt-4{margin-top:16px}.check-box{appearance:none;-webkit-appearance:none;width:20px;height:20px;min-width:20px;min-height:20px;margin:0;flex-shrink:0;border-radius:4px;border:1.5px solid rgba(255,255,255,.4);background-color:var(--surface-1);cursor:pointer;display:grid;place-content:center;transition:background-color var(--dur-fast),border-color 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