:root{--c-paper: #F5F1E8;--c-paper-2: #EFE9DC;--c-paper-3: #E8E0CE;--c-paper-line: #DCD4C2;--c-ink: #1A1714;--c-ink-soft: #4A443C;--c-ink-mute: #8A8378;--c-ink-faint: #B8B0A2;--c-blue: #1F4FD1;--c-blue-deep: #173FA8;--c-blue-soft: #DCE6FB;--c-blue-tint: #C2D4F7;--c-blue-glow: rgba(31, 79, 209, .18);--c-orange: #E85A2C;--c-orange-deep: #C9461B;--c-orange-soft: #FBE7DC;--c-good: #1F8A5B;--c-good-soft: #D9EAE0;--c-bad: #C0392B;--c-bad-soft: #F2D5D1;--c-serif: "DM Serif Display", "Newsreader", Georgia, serif;--c-sans: "Inter", -apple-system, system-ui, sans-serif;--c-mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;--color-primary: var(--c-blue);--color-primary-hover: var(--c-blue-deep);--color-primary-light: var(--c-blue);--color-primary-soft: var(--c-blue-soft);--color-primary-text: var(--c-blue-deep);--color-success: var(--c-good);--color-success-soft: var(--c-good-soft);--color-success-text: #0F5A3B;--color-danger: var(--c-bad);--color-danger-soft: var(--c-bad-soft);--color-danger-text: #7A1F15;--color-warning: var(--c-orange);--color-warning-soft: var(--c-orange-soft);--color-warning-text: var(--c-orange-deep);--color-info: var(--c-blue);--color-bg: var(--c-paper);--color-surface: var(--c-paper);--color-surface-elevated: var(--c-paper);--color-text: var(--c-ink);--color-text-secondary: var(--c-ink-soft);--color-text-muted: var(--c-ink-mute);--color-border: var(--c-paper-line);--color-border-strong: var(--c-ink-faint);--sp-1: .25rem;--sp-2: .5rem;--sp-3: .75rem;--sp-4: 1rem;--sp-5: 1.25rem;--sp-6: 1.5rem;--sp-8: 2rem;--sp-10: 2.5rem;--sp-12: 3rem;--sp-16: 4rem;--r-sm: 6px;--r-md: 10px;--r-lg: 14px;--r-xl: 20px;--r-full: 999px;--shadow-xs: 0 1px 2px rgba(15, 23, 42, .04);--shadow-sm: 0 2px 4px rgba(15, 23, 42, .06), 0 1px 2px rgba(15, 23, 42, .04);--shadow-md: 0 4px 12px rgba(15, 23, 42, .08), 0 2px 4px rgba(15, 23, 42, .04);--shadow-lg: 0 12px 24px rgba(15, 23, 42, .1), 0 4px 8px rgba(15, 23, 42, .05);--shadow-xl: 0 24px 48px rgba(15, 23, 42, .14);--max-width: 1100px;--header-h: 64px;--bottom-nav-h: 64px;--t-fast: .12s cubic-bezier(.4, 0, .2, 1);--t-base: .2s cubic-bezier(.4, 0, .2, 1);--t-slow: .32s cubic-bezier(.4, 0, .2, 1)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html,body{height:100%}body{font-family:var(--c-sans);font-size:16px;line-height:1.55;background:var(--c-paper);color:var(--c-ink);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}h1,h2,h3{font-family:var(--c-serif);font-weight:400;letter-spacing:-.012em}img,svg{display:block;max-width:100%}button{font-family:inherit;font-size:inherit}a{color:var(--color-primary);text-decoration:none}a:hover{text-decoration:underline}h1,h2,h3,h4{line-height:1.15;letter-spacing:-.012em;color:var(--c-ink)}h1{font-family:var(--c-serif);font-size:clamp(1.875rem,4.4vw,2.75rem);font-weight:400}h2{font-family:var(--c-serif);font-size:clamp(1.5rem,3.2vw,2rem);font-weight:400}h3{font-family:var(--c-serif);font-size:1.375rem;font-weight:400}h4{font-family:var(--c-sans);font-size:1.0625rem;font-weight:600}p{color:var(--c-ink-soft)}.app-shell{min-height:100%;padding-bottom:calc(var(--bottom-nav-h) + 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#ffffff8c,2px 2px 0 var(--c-ink);transform:rotate(-3deg);font-family:var(--c-serif);font-size:1.125rem;font-style:italic;font-weight:400;letter-spacing:-.04em;line-height:1}.logo>span:not(.logo-mark){font-family:var(--c-serif);font-size:1.25rem;font-weight:400;color:var(--c-ink);letter-spacing:-.01em;line-height:1}.nav-desktop{display:none;align-items:center;gap:24px}@media (min-width: 768px){.nav-desktop{display:flex}}.nav-desktop a{color:var(--c-ink-soft);font-size:.9rem;font-weight:500;padding:6px 4px;transition:color .14s ease}.nav-desktop a:hover{color:var(--c-ink);background:transparent;text-decoration:none}.nav-desktop a.active{color:var(--c-blue-deep)!important;background:transparent;border-bottom:2px solid var(--c-blue);border-radius:0;padding-bottom:4px}.user-chip{display:inline-flex;align-items:center;gap:8px;padding:6px 12px 6px 6px;background:var(--c-paper-2);border:1px solid 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var(--c-paper-line);background:transparent}.theory-list-row{min-height:58px;display:grid;grid-template-columns:38px 38px minmax(0,1fr) auto 24px;align-items:center;gap:10px;padding:8px 0;color:var(--c-ink);text-decoration:none;border-bottom:1px solid var(--c-paper-line)}.theory-list-row:hover{background:color-mix(in srgb,var(--c-blue-soft) 42%,transparent);text-decoration:none}.theory-list-index{font-family:var(--c-mono);font-size:.72rem;color:var(--c-ink-mute)}.theory-list-icon{width:34px;height:34px;display:grid;place-items:center;border:1px solid var(--c-paper-line);border-radius:9px;background:var(--c-paper-2);color:var(--c-blue-deep)}.theory-list-title{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-weight:700}.theory-list-status{padding:4px 8px;border-radius:999px;background:var(--c-paper-2);color:var(--c-ink-soft);font-size:.76rem;font-weight:700;white-space:nowrap}.theory-list-arrow{color:var(--c-ink-mute)}@media (max-width: 430px){.theory-list-row{grid-template-columns:28px 34px minmax(0,1fr) 20px;min-height:54px;gap:8px;padding:8px 0}.theory-list-status{display:none}}.account-page{max-width:680px;margin:0 auto}.account-head{margin-bottom:18px}.account-head h1{font-size:clamp(2rem,5vw,2.75rem);margin:0 0 4px}.account-head p{margin:0}.account-panel,.account-actions{border:1.5px solid var(--c-ink);border-radius:12px;overflow:hidden;background:var(--c-paper);box-shadow:5px 5px 0 var(--c-paper-3)}.account-actions{margin-top:18px}.account-row,.account-action{min-height:54px;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:12px 16px;border-bottom:1px dashed var(--c-paper-line)}.account-row:last-child,.account-action:last-child{border-bottom:0}.account-row span,.account-action span{color:var(--c-ink-soft)}.account-row strong{min-width:0;color:var(--c-ink);text-align:right;overflow-wrap:anywhere}.account-action{width:100%;border-left:0;border-right:0;border-top:0;background:transparent;color:var(--c-ink);font:inherit;font-weight:700;text-decoration:none;cursor:pointer}.account-action:hover:not(:disabled){background:var(--c-paper-2);text-decoration:none}.account-action:disabled{cursor:not-allowed;opacity:.65}.account-soon{padding:4px 8px;border-radius:999px;background:var(--c-paper-2);font-size:.76rem;font-weight:700}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--sp-2);padding:var(--sp-3) var(--sp-5);border-radius:var(--r-md);font-size:.95rem;font-weight:600;border:1px solid transparent;background:transparent;cursor:pointer;text-decoration:none;transition:var(--t-fast);min-height:44px;white-space:nowrap}.btn:disabled{opacity:.55;cursor:not-allowed}.btn:hover{text-decoration:none}.btn:active:not(:disabled){transform:translateY(1px)}.btn-primary,a.btn-primary{background:var(--c-blue);color:#fff;border-color:var(--c-blue);box-shadow:inset 0 1px #ffffff2e,0 8px 18px -10px var(--c-blue-glow)}.btn-primary:hover:not(:disabled),a.btn-primary:hover{background:var(--c-blue-deep);color:#fff;border-color:var(--c-blue-deep)}.btn-secondary,a.btn-secondary{background:var(--c-blue-soft);color:var(--c-blue-deep)}.btn-secondary:hover:not(:disabled),a.btn-secondary:hover{background:var(--c-blue-tint);color:var(--c-blue-deep)}.btn-outline,a.btn-outline{border-color:var(--c-ink-faint);color:var(--c-ink);background:var(--c-paper)}.btn-outline:hover:not(:disabled),a.btn-outline:hover{border-color:var(--c-ink);color:var(--c-ink);background:var(--c-paper-2)}.btn-ghost,a.btn-ghost{color:var(--c-ink-soft);background:transparent}.btn-ghost:hover:not(:disabled),a.btn-ghost:hover{background:var(--c-paper-2);color:var(--c-ink)}.btn-success{background:var(--color-success);color:#fff}.btn-success:hover:not(:disabled){background:#059669}.btn-danger{background:var(--color-danger);color:#fff}.btn-danger:hover:not(:disabled){background:#dc2626}.btn-sm{padding:var(--sp-2) var(--sp-3);font-size:.85rem;min-height:36px}.btn-lg{padding:var(--sp-4) var(--sp-6);font-size:1.05rem;min-height:52px}.btn-block{width:100%}.card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--r-lg);padding:var(--sp-5);box-shadow:var(--shadow-xs);transition:var(--t-base)}.card:hover{box-shadow:var(--shadow-sm)}.card-elevated{box-shadow:var(--shadow-md);border:none}.card-pad-lg{padding:var(--sp-8)}.card-clickable{cursor:pointer;transition:var(--t-base)}.card-clickable:hover{transform:translateY(-2px);box-shadow:var(--shadow-md);border-color:var(--color-border-strong)}.field{display:block;margin-bottom:var(--sp-4)}.field-label{display:block;margin-bottom:var(--sp-2);font-size:.875rem;font-weight:600;color:var(--color-text)}.field-hint{margin-top:var(--sp-1);font-size:.8rem;color:var(--color-text-muted)}.input,input[type=text],input[type=email],input[type=password],input[type=search],textarea,select{width:100%;padding:var(--sp-3) var(--sp-4);border:1px solid var(--color-border);border-radius:var(--r-md);font-size:1rem;font-family:inherit;background:var(--color-surface);color:var(--color-text);transition:var(--t-fast);min-height:48px}.input:focus,input:focus,textarea:focus,select:focus{outline:none;border-color:var(--color-primary);box-shadow:0 0 0 3px #4f46e526}textarea{min-height:100px;resize:vertical}.input-password{position:relative;display:flex;align-items:center}.input-password input{padding-right:3rem}.input-password-toggle{position:absolute;right:var(--sp-2);background:transparent;border:0;cursor:pointer;padding:var(--sp-2);color:var(--color-text-muted);display:grid;place-items:center;border-radius:var(--r-sm)}.input-password-toggle:hover{color:var(--color-text);background:var(--color-bg)}.alert{padding:var(--sp-3) var(--sp-4);border-radius:var(--r-md);font-size:.9rem;margin-bottom:var(--sp-4);display:flex;align-items:flex-start;gap:var(--sp-2)}.alert-error{background:var(--color-danger-soft);color:var(--color-danger-text);border:1px solid #fecaca}.alert-success{background:var(--color-success-soft);color:var(--color-success-text);border:1px solid #a7f3d0}.alert-info{background:#e0f2fe;color:#075985;border:1px solid #bae6fd}.alert-warning{background:var(--color-warning-soft);color:var(--color-warning-text);border:1px solid #fde68a}.badge{display:inline-flex;align-items:center;gap:var(--sp-1);padding:2px var(--sp-2);background:var(--color-bg);color:var(--color-text-secondary);border-radius:var(--r-full);font-size:.72rem;font-weight:600;text-transform:uppercase;letter-spacing:.04em}.badge-primary{background:var(--color-primary-soft);color:var(--color-primary-text)}.badge-success{background:var(--color-success-soft);color:var(--color-success-text)}.badge-danger{background:var(--color-danger-soft);color:var(--color-danger-text)}.badge-warning{background:var(--color-warning-soft);color:var(--color-warning-text)}.skeleton{background:linear-gradient(90deg,var(--c-paper-2) 0%,var(--c-paper-3) 50%,var(--c-paper-2) 100%);background-size:200% 100%;animation:skeleton-shimmer 1.5s infinite;border-radius:12px;border:1px dashed var(--c-paper-line)}@keyframes skeleton-shimmer{0%{background-position:200% 0}to{background-position:-200% 0}}.skeleton-line{height:16px}.skeleton-card{height:120px;margin-bottom:12px}.hero{text-align:center;padding:var(--sp-12) 0 var(--sp-8)}.hero-eyebrow{display:inline-flex;align-items:center;gap:var(--sp-2);padding:var(--sp-2) var(--sp-3);background:var(--color-primary-soft);color:var(--color-primary-text);border-radius:var(--r-full);font-size:.85rem;font-weight:600;margin-bottom:var(--sp-4)}.hero h1{font-size:clamp(2rem,6vw,3.25rem);font-weight:800;letter-spacing:0;margin-bottom:var(--sp-4);background:linear-gradient(135deg,var(--color-text) 0%,var(--color-primary) 100%);-webkit-background-clip:text;background-clip:text;color:transparent}.hero-lead{font-size:clamp(1rem,2.5vw,1.2rem);color:var(--color-text-secondary);max-width:620px;margin:0 auto var(--sp-8)}.hero-actions{display:flex;gap:var(--sp-3);justify-content:center;flex-wrap:wrap}.hero-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--sp-4);max-width:600px;margin:var(--sp-10) auto 0}.hero-stat{text-align:center}.hero-stat-value{font-size:clamp(1.5rem,4vw,2rem);font-weight:800;color:var(--color-primary)}.hero-stat-label{font-size:.85rem;color:var(--color-text-secondary)}.section-features{padding:var(--sp-10) 0}.section-title{text-align:center;margin-bottom:var(--sp-8)}.section-title h2{margin-bottom:var(--sp-2)}.section-title p{max-width:560px;margin:0 auto}.feature-grid{display:grid;grid-template-columns:1fr;gap:var(--sp-4)}@media (min-width: 768px){.feature-grid{grid-template-columns:repeat(3,1fr)}}.feature-card{padding:var(--sp-6);background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--r-lg)}.feature-icon{width:44px;height:44px;border-radius:var(--r-md);background:var(--color-primary-soft);color:var(--color-primary);display:grid;place-items:center;font-size:1.4rem;margin-bottom:var(--sp-3)}.auth-page{min-height:calc(100vh - var(--header-h) - var(--bottom-nav-h));display:flex;align-items:center;justify-content:center;padding:var(--sp-4)}.auth-card{width:100%;max-width:420px;background:var(--color-surface);border-radius:var(--r-xl);box-shadow:var(--shadow-lg);padding:var(--sp-8)}.auth-header{text-align:center;margin-bottom:var(--sp-6)}.auth-header h2{margin-bottom:var(--sp-2)}.auth-header p{font-size:.9rem}.auth-footer{margin-top:var(--sp-6);padding-top:var(--sp-4);border-top:1px solid var(--color-border);text-align:center;font-size:.9rem;color:var(--color-text-secondary)}.page-header{display:flex;align-items:flex-end;justify-content:space-between;flex-wrap:wrap;gap:var(--sp-3);margin-bottom:var(--sp-6)}.page-header-text h1{margin-bottom:var(--sp-1)}.page-header-text p{font-size:.95rem}.greeting{font-size:clamp(1.4rem,4vw,1.75rem);font-weight:700;margin-bottom:var(--sp-1)}.greeting-sub{font-size:.95rem}.stats-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:var(--sp-3);margin-bottom:var(--sp-6)}@media (min-width: 768px){.stats-grid{grid-template-columns:repeat(4,1fr)}}.stat-card{padding:var(--sp-4);background:var(--color-surface);border-radius:var(--r-lg);border:1px solid var(--color-border)}.stat-card-label{font-size:.75rem;text-transform:uppercase;letter-spacing:.05em;color:var(--color-text-muted);font-weight:600;margin-bottom:var(--sp-2)}.stat-card-value{font-size:1.75rem;font-weight:800;line-height:1;color:var(--color-text)}.stat-card-trend{margin-top:var(--sp-1);font-size:.8rem;color:var(--color-text-secondary)}.action-grid{display:grid;grid-template-columns:1fr;gap:var(--sp-3);margin-bottom:var(--sp-8)}@media (min-width: 640px){.action-grid{grid-template-columns:repeat(2,1fr)}}@media (min-width: 1024px){.action-grid{grid-template-columns:repeat(4,1fr)}}.action-card{padding:var(--sp-5);background:var(--color-surface);border-radius:var(--r-lg);border:1px solid var(--color-border);display:flex;align-items:center;gap:var(--sp-4);text-decoration:none;color:inherit;transition:var(--t-base)}.action-card:hover{text-decoration:none;transform:translateY(-2px);box-shadow:var(--shadow-md);border-color:var(--color-primary)}.action-card-icon{width:48px;height:48px;flex-shrink:0;border-radius:var(--r-md);display:grid;place-items:center;font-size:1.4rem;background:var(--color-primary-soft);color:var(--color-primary)}.action-card-icon.success{background:var(--color-success-soft);color:var(--color-success-text)}.action-card-icon.warning{background:var(--color-warning-soft);color:var(--color-warning-text)}.action-card-text h3{margin-bottom:2px;font-size:1rem}.action-card-text p{font-size:.85rem}.section{margin-bottom:var(--sp-8)}.section-header{display:flex;justify-content:space-between;align-items:baseline;margin-bottom:var(--sp-4);flex-wrap:wrap;gap:var(--sp-2)}.chapter-grid{display:grid;grid-template-columns:1fr;gap:var(--sp-3)}@media (min-width: 640px){.chapter-grid{grid-template-columns:repeat(2,1fr)}}@media (min-width: 1024px){.chapter-grid{grid-template-columns:repeat(3,1fr)}}.chapter-card{display:block;padding:var(--sp-5);background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--r-lg);text-decoration:none;color:inherit;transition:var(--t-base)}.chapter-card:hover{text-decoration:none;transform:translateY(-2px);box-shadow:var(--shadow-md);border-color:var(--color-primary)}.chapter-card-header{display:flex;justify-content:space-between;align-items:flex-start;gap:var(--sp-2);margin-bottom:var(--sp-2)}.chapter-card-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--sp-3)}.chapter-card-icon{width:44px;height:44px;border-radius:var(--r-md);display:flex;align-items:center;justify-content:center;background:var(--color-primary-soft);color:var(--color-primary);transition:var(--t-fast)}.chapter-card:hover 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.callout-title{font-weight:700;font-size:.85rem;letter-spacing:.02em;margin-bottom:6px}.theory-content .callout-body{font-size:.92rem;line-height:1.55}.theory-content .callout-info{background:#eff6ff;border-color:#3b82f6;color:#1e40af}.theory-content .callout-tip{background:var(--color-primary-soft);border-color:var(--color-primary);color:var(--color-primary-text)}.theory-content .callout-warning{background:var(--color-warning-soft);border-color:var(--color-warning);color:var(--color-warning-text)}.theory-content .callout-key{background:var(--color-success-soft);border-color:var(--color-success);color:var(--color-success-text)}.theory-content .callout-mistake{background:var(--color-danger-soft);border-color:var(--color-danger);color:var(--color-danger-text)}.theory-content .keystats-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:var(--sp-3);margin:var(--sp-4) 0}.theory-content .keystat{text-align:center;padding:var(--sp-4) 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var(--color-border);background:var(--color-bg);border-radius:var(--r-md);cursor:pointer;font:inherit;text-align:left;width:100%;transition:all var(--t-fast);color:var(--color-text)}.theory-quiz-choice:hover:not(:disabled){border-color:var(--color-primary);background:var(--color-surface)}.theory-quiz-choice:disabled{cursor:default}.theory-quiz-choice.is-selected{border-color:var(--color-primary);background:var(--color-primary-soft)}.theory-quiz-choice.is-correct{border-color:var(--color-success);background:var(--color-success-soft);color:var(--color-success-text);font-weight:600}.theory-quiz-choice.is-incorrect{border-color:var(--color-danger);background:var(--color-danger-soft);color:var(--color-danger-text)}.theory-quiz-letter{width:28px;height:28px;flex-shrink:0;border-radius:50%;background:var(--color-surface);border:1px solid 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20px}.payment-success-card{width:100%;max-width:540px;background:var(--c-paper);border:1.5px solid var(--c-ink);border-radius:22px;padding:clamp(32px,5vw,56px);box-shadow:10px 10px 0 var(--c-blue);display:flex;flex-direction:column;align-items:center;text-align:center;gap:18px}.payment-success-meta{color:var(--c-ink-mute)}.payment-success-borne{width:88px;height:88px;border-radius:50%;background:var(--c-blue);color:#fff;display:inline-flex;align-items:center;justify-content:center;box-shadow:0 0 0 6px var(--c-blue-soft),4px 4px 0 var(--c-ink);margin:4px 0}.payment-success-title{font-family:var(--c-serif);font-size:clamp(2.25rem,5vw,3rem);font-weight:400;line-height:1.04;letter-spacing:-.022em;color:var(--c-ink);margin:0}.payment-success-title em{font-style:italic;color:var(--c-blue)}.payment-success-sub{color:var(--c-ink-soft);font-size:1.0625rem;line-height:1.55;max-width:44ch;margin:0}.payment-success-perks{width:100%;display:flex;flex-direction:column;gap:8px;margin:12px 0 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.practice-mode-icon{background:#ffffff29;color:#fff}.practice-mode-title{font-family:var(--c-serif);font-size:clamp(1.65rem,4vw,2.15rem);line-height:1;color:currentColor}.practice-mode-sub{color:currentColor;opacity:.72;font-weight:700}.practice-mode-arrow{position:absolute;right:18px;top:18px}.practice-chapters-header{gap:8px}.practice-chapter-list{display:flex;flex-direction:column;border-top:1px solid var(--c-paper-line);background:transparent}.practice-chapter-row{min-height:58px;display:grid;grid-template-columns:38px 38px minmax(0,1fr) 24px;align-items:center;gap:10px;padding:8px 0;color:var(--c-ink);text-decoration:none;border-bottom:1px solid var(--c-paper-line)}.practice-chapter-row:last-child{border-bottom:1px solid var(--c-paper-line)}.practice-chapter-row:hover{background:color-mix(in srgb,var(--c-blue-soft) 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