:root,[data-theme=light]{--color-primary:#6366f1;--color-primary-dark:#4f46e5;--color-primary-light:#a5b4fc;--color-accent:#10b981;--color-bg:#f9fafb;--color-surface:#fff;--color-text:#111827;--color-text-secondary:#6b7280;--color-text-muted:#9ca3af;--color-border:#e5e7eb;--color-border-light:#f3f4f6;--radius:10px;--radius-lg:16px;--shadow-sm:0 1px 2px rgba(0,0,0,.04);--shadow:0 1px 3px rgba(0,0,0,.06),0 1px 2px rgba(0,0,0,.04);--shadow-md:0 4px 12px rgba(0,0,0,.08);--shadow-lg:0 12px 32px rgba(0,0,0,.1);--transition:0.15s ease;--color-nav-bg:#111827;--color-nav-text:#d1d5db;--color-nav-text-hover:#fff;--color-nav-active:var(--color-primary);--color-hero-bg:#111827;--color-hero-accent:var(--color-primary);--color-code-bg:#1e1e2e;--color-code-text:#cdd6f4;--color-footer-bg:#111827;--color-footer-text:#9ca3af;--color-success-bg:#ecfdf5;--color-success-text:#065f46;--color-success-border:#a7f3d0;--color-error-bg:#fef2f2;--color-error-text:#991b1b;--color-error-border:#fecaca;--color-badge-bg:#eef2ff;--color-badge-text:#4338ca;--color-danger-bg:#fef2f2;--color-danger-text:#dc2626;--color-danger-border:#fecaca;--color-danger-hover:#fee2e2}[data-theme=dark]{--color-primary:#818cf8;--color-primary-dark:#6366f1;--color-primary-light:#4338ca;--color-accent:#34d399;--color-bg:#0f111a;--color-surface:#1a1d2e;--color-text:#e5e7eb;--color-text-secondary:#9ca3af;--color-text-muted:#6b7280;--color-border:#2d3348;--color-border-light:#1f2237;--shadow-sm:0 1px 2px rgba(0,0,0,.2);--shadow:0 1px 3px rgba(0,0,0,.3),0 1px 2px rgba(0,0,0,.2);--shadow-md:0 4px 12px rgba(0,0,0,.4);--shadow-lg:0 12px 32px rgba(0,0,0,.5);--color-nav-bg:#0a0c14;--color-nav-text:#9ca3af;--color-nav-text-hover:#e5e7eb;--color-nav-active:var(--color-primary);--color-hero-bg:#0a0c14;--color-hero-accent:var(--color-primary);--color-code-bg:#0a0c14;--color-code-text:#cdd6f4;--color-footer-bg:#0a0c14;--color-footer-text:#6b7280;--color-success-bg:#052e16;--color-success-text:#6ee7b7;--color-success-border:#065f46;--color-error-bg:#450a0a;--color-error-text:#fca5a5;--color-error-border:#991b1b;--color-badge-bg:#1e1b4b;--color-badge-text:#a5b4fc;--color-danger-bg:#450a0a;--color-danger-text:#fca5a5;--color-danger-border:#991b1b;--color-danger-hover:#7f1d1d}*{box-sizing:border-box;margin:0;padding:0}body{background:var(--color-bg);color:var(--color-text);display:flex;flex-direction:column;font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe 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var(--transition)}.navbar__link:hover{background:hsla(0,0%,100%,.06);color:var(--color-nav-text-hover)}.navbar__link--active{background:hsla(0,0%,100%,.1);color:#fff}.navbar__link--active:hover{background:hsla(0,0%,100%,.14);color:#fff}.navbar__separator{background:hsla(0,0%,100%,.12);height:20px;margin:0 10px;width:1px}.navbar__user{align-items:center;color:var(--color-nav-text);display:flex;font-size:13px;font-weight:600;padding:0 8px}.navbar__link--cta{background:#fff;border-radius:6px;color:var(--color-primary-dark);font-weight:600}.navbar__link--cta:hover{background:hsla(0,0%,100%,.88);color:var(--color-primary-dark)}.navbar__link--outline{border:1px solid hsla(0,0%,100%,.15);border-radius:6px;color:var(--color-nav-text)}.navbar__link--outline:hover{background:transparent;border-color:hsla(0,0%,100%,.3);color:#fff}.navbar__link--admin{color:#fbbf24;font-weight:600}.navbar__link--admin:hover{background:rgba(251,191,36,.08);color:#fde68a}.hero{background:var(--color-hero-bg);color:#fff;overflow:hidden;padding:80px 48px;position:relative}.hero:before{background:radial-gradient(circle,var(--color-hero-accent) 0,transparent 70%);content:"";height:600px;opacity:.06;pointer-events:none;position:absolute;right:-20%;top:-50%;width:600px}.hero--small{padding:56px 48px}.hero .container{position:relative}.hero__title{font-size:40px;font-weight:800;letter-spacing:-.8px;line-height:1.15;margin-bottom:12px}.hero__subtitle{color:hsla(0,0%,100%,.6);font-size:17px;line-height:1.7;max-width:560px}.hero__cta{display:flex;gap:12px;margin-top:32px}.btn.btn--light{border-color:hsla(0,0%,100%,.7);color:#fff}.btn.btn--light:hover{background:#fff;border-color:#fff;color:var(--color-primary-dark)}.section{padding:72px 0}.section--alt{background:var(--color-surface)}.section__title{font-size:24px;font-weight:700;letter-spacing:-.3px;margin-bottom:48px;text-align:center}.section-header{align-items:center;display:flex;justify-content:space-between;margin-bottom:32px}.section-header__title{font-size:22px;font-weight:700;letter-spacing:-.3px}.stats-grid{display:grid;gap:20px;grid-template-columns:repeat(4,1fr)}.stat-card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius);display:flex;flex-direction:column;gap:6px;padding:28px 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var(--transition)}.card:hover{border-color:var(--color-primary-light);box-shadow:var(--shadow-md)}.card--link{color:inherit;display:flex;flex-direction:column;text-decoration:none}.card__icon{align-items:center;background:var(--color-badge-bg);border-radius:10px;color:var(--color-primary);display:flex;font-size:18px;font-weight:700;height:40px;justify-content:center;margin-bottom:16px;width:40px}.card__title{font-size:16px;font-weight:600;letter-spacing:-.2px;margin-bottom:8px}.card__text{color:var(--color-text-secondary);font-size:14px;line-height:1.6}.card__meta{border-top:1px solid var(--color-border-light);color:var(--color-text-muted);display:flex;font-size:12px;gap:16px;margin-top:16px;padding-top:12px}.card__title a{color:var(--color-text);text-decoration:none}.card__title a:hover{color:var(--color-primary)}.card--horizontal{align-items:center;display:flex;gap:24px;justify-content:space-between}.card__body{flex:1;min-width:0}.card__action{flex-shrink:0}.step{padding:24px;text-align:center}.step__number{align-items:center;background:var(--color-badge-bg);border-radius:12px;color:var(--color-primary);display:inline-flex;font-size:16px;font-weight:700;height:40px;justify-content:center;margin-bottom:16px;width:40px}.step__title{font-size:16px;font-weight:600;margin-bottom:8px}.step__text{color:var(--color-text-secondary);font-size:14px;line-height:1.6}.auth-card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);box-shadow:var(--shadow);margin:0 auto;max-width:420px;padding:36px}.auth-form{display:flex;flex-direction:column;gap:20px}.auth-card__footer{color:var(--color-text-secondary);font-size:13px;margin-top:20px;text-align:center}.auth-card__footer a{color:var(--color-primary);font-weight:600;text-decoration:none}.auth-card__footer a:hover{text-decoration:underline}.auth-form ul{list-style:none;margin:0;padding:0}.auth-form li{color:var(--color-danger-text);font-size:13px;margin-top:4px}.form-group{display:flex;flex-direction:column;gap:6px}.form-group--checkbox{align-items:center;flex-direction:row;gap:10px}.form-label--inline{cursor:pointer;font-weight:500}.form-checkbox{accent-color:var(--color-primary);cursor:pointer;height:18px;width:18px}.form-label{color:var(--color-text);font-size:13px;font-weight:600}.form-input{background:var(--color-bg);border:1px solid var(--color-border);border-radius:8px;color:var(--color-text);font-family:inherit;font-size:14px;padding:10px 14px;transition:border-color var(--transition),box-shadow var(--transition)}.form-input:focus{border-color:var(--color-primary);box-shadow:0 0 0 3px rgba(99,102,241,.12);outline:none}.form-input--textarea{font-family:JetBrains Mono,Fira 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var(--color-border);color:var(--color-text)}.btn--outline:hover{border-color:var(--color-primary);color:var(--color-primary)}.btn--ghost{background:transparent;border:none;color:var(--color-primary)}.btn--ghost:hover{background:var(--color-badge-bg)}.btn--danger{background:var(--color-danger-bg);border:1px solid var(--color-danger-border);color:var(--color-danger-text)}.btn--danger:hover{background:var(--color-danger-hover)}.flash{border-radius:8px;font-size:14px;margin-bottom:20px;padding:12px 16px}.flash--error{background:var(--color-error-bg);border:1px solid var(--color-error-border);color:var(--color-error-text)}.flash--success{background:var(--color-success-bg);border:1px solid var(--color-success-border);color:var(--color-success-text)}.alert{align-items:center;border-radius:var(--radius);display:flex;gap:16px;margin-bottom:24px;padding:16px 20px}.alert--info{border:1px solid var(--color-primary-light)}.alert--info,.badge{background:var(--color-badge-bg);color:var(--color-badge-text)}.badge{align-items:center;border-radius:6px;display:inline-flex;font-size:12px;font-weight:600;padding:4px 10px}.badge--enrolled{background:var(--color-badge-bg);color:var(--color-badge-text)}.badge--auth{background:var(--color-error-bg);border:1px solid var(--color-error-border);color:var(--color-error-text);margin-left:8px;vertical-align:middle}.badge--auth,.badge--read{font-size:11px;padding:2px 8px}.badge--read{background:var(--color-success-bg);border:1px solid var(--color-success-border);color:var(--color-success-text)}.badge--progress{background:var(--color-badge-bg);color:var(--color-badge-text);font-size:11px;padding:2px 8px}.progress{background:var(--color-border);border-radius:3px;height:6px;margin:12px 0 8px;overflow:hidden}.progress__bar{background:var(--color-primary);border-radius:3px;height:100%;transition:width .3s ease}.empty-state{padding:64px 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.chapter__number{background:var(--color-success-bg);color:var(--color-success-text)}.article-list{border:1px solid var(--color-border);border-radius:var(--radius);list-style:none;margin:0;overflow:hidden;padding:0}.article-list__item{border-bottom:1px solid var(--color-border)}.article-list__item:last-child{border-bottom:none}.article-list__item a{color:var(--color-text);display:block;font-size:14px;padding:12px 20px;text-decoration:none;transition:background var(--transition),color var(--transition)}.article-list__item a:hover{background:var(--color-badge-bg);color:var(--color-primary)}.article-list__item--read a{color:var(--color-text-muted)}.read-check{color:var(--color-accent);font-weight:700;margin-right:8px}.breadcrumb{align-items:center;color:var(--color-text-muted);display:flex;font-size:13px;gap:8px;margin-bottom:32px}.breadcrumb a{color:var(--color-text-secondary);text-decoration:none}.breadcrumb a:hover{color:var(--color-primary)}.breadcrumb__sep{color:var(--color-border)}.article-layout{margin:0 auto;max-width:780px}.article-content__header{align-items:center;display:flex;gap:16px;margin-bottom:32px}.article-content__title{font-size:30px;font-weight:800;letter-spacing:-.5px;line-height:1.2}.article-content__body{color:var(--color-text);font-size:16px;line-height:1.85}.article-content__body h2{font-size:22px;font-weight:700;letter-spacing:-.3px;margin-bottom:16px;margin-top:40px}.article-content__body h3{font-size:18px;font-weight:600;margin-bottom:12px;margin-top:32px}.article-content__body p{margin-bottom:16px}.article-content__body pre{background:var(--color-code-bg);border:1px solid hsla(0,0%,100%,.05);border-radius:10px;color:var(--color-code-text);font-family:JetBrains Mono,Fira Code,Cascadia Code,monospace;font-size:13.5px;line-height:1.7;margin:24px 0;overflow-x:auto;padding:20px 24px}.code-block{position:relative}.code-copy-btn{align-items:center;background:hsla(0,0%,100%,.05);border:1px solid hsla(0,0%,100%,.1);border-radius:6px;color:var(--color-code-text);cursor:pointer;display:flex;height:30px;justify-content:center;opacity:0;position:absolute;right:10px;top:10px;transition:opacity var(--transition),background var(--transition);width:30px}.code-block:hover .code-copy-btn{opacity:1}.code-copy-btn:hover{background:hsla(0,0%,100%,.1)}.code-copy-btn--copied{background:rgba(16,185,129,.1);border-color:rgba(16,185,129,.3);color:var(--color-accent)}.code-copy-btn--error{background:rgba(248,113,113,.1);border-color:rgba(248,113,113,.3);color:#f87171}.article-content__body code{background:var(--color-badge-bg);border-radius:5px;color:var(--color-badge-text);font-family:JetBrains Mono,Fira Code,monospace;font-size:13px;padding:2px 7px}.article-content__body pre code{background:transparent;color:inherit;padding:0}.article-content__body ol,.article-content__body ul{margin-bottom:16px;padding-left:24px}.article-content__body li{margin-bottom:6px}.article-nav{border-top:1px solid var(--color-border);display:flex;gap:24px;grid-column:1;justify-content:space-between;margin-top:48px;padding-top:32px}.article-nav__link{border:1px solid var(--color-border);border-radius:var(--radius);display:flex;flex-direction:column;gap:4px;max-width:48%;padding:14px 18px;text-decoration:none;transition:border-color var(--transition),box-shadow var(--transition)}.article-nav__link:hover{border-color:var(--color-primary);box-shadow:var(--shadow)}.article-nav__link--next{margin-left:auto;text-align:right}.article-nav__label{color:var(--color-text-muted);font-size:11px;font-weight:600;letter-spacing:.8px;text-transform:uppercase}.article-nav__title{color:var(--color-primary);font-size:14px;font-weight:600}.content h2{font-size:22px;font-weight:700;letter-spacing:-.2px;margin-bottom:12px;margin-top:48px}.content h2:first-child{margin-top:0}.content 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var(--color-border);border-radius:var(--radius);box-shadow:var(--shadow-sm);padding:16px 20px}.admin-meta__label{color:var(--color-text-muted);display:block;font-size:11px;letter-spacing:.5px;margin-bottom:6px;text-transform:uppercase}.admin-meta__value{color:var(--color-text);font-size:15px;font-weight:600}.admin-form__hint{color:var(--color-text-secondary);font-size:12.5px;margin-top:4px}.table{background:var(--color-surface);border:1px solid var(--color-border);border-collapse:collapse;border-radius:var(--radius);font-size:13.5px;overflow:hidden;width:100%}.table th{background:var(--color-bg);border-bottom:1px solid var(--color-border);color:var(--color-text-muted);font-size:11px;font-weight:600;letter-spacing:.5px;padding:10px 20px;text-align:left;text-transform:uppercase}.table td{border-bottom:1px solid var(--color-border-light);padding:12px 20px;vertical-align:middle}.table tr:last-child td{border-bottom:none}.table tr:hover td{background:var(--color-bg)}.table__title{font-weight:600}.table__actions{align-items:center;display:flex;gap:6px}.table code{background:var(--color-badge-bg);border-radius:4px;color:var(--color-badge-text);font-size:12px;padding:2px 6px}.inline-form{display:inline}.chapter-admin-list{display:flex;flex-direction:column;gap:16px}.chapter-admin{border:1px solid var(--color-border);border-radius:var(--radius);overflow:hidden}.chapter-admin__header{align-items:center;background:var(--color-bg);display:flex;gap:16px;justify-content:space-between;padding:14px 20px}.chapter-admin__info{align-items:center;display:flex;font-size:14px;gap:12px}.chapter-admin__actions{align-items:center;display:flex;flex-shrink:0;gap:6px}.article-admin-list{list-style:none;margin:0;padding:0}.article-admin-list__item{align-items:center;border-top:1px solid var(--color-border-light);display:flex;font-size:13px;gap:16px;justify-content:space-between;padding:10px 20px}.article-admin-list__info{align-items:center;display:flex;gap:8px;min-width:0}.article-admin-list__info code{background:var(--color-badge-bg);border-radius:4px;font-size:11px;padding:2px 6px}.article-admin-list__actions{display:flex;flex-shrink:0;gap:6px}.html-toolbar{background:var(--color-bg);border:1px solid var(--color-border);border-bottom:none;border-radius:8px 8px 0 0;display:flex;flex-wrap:wrap;gap:2px;padding:8px}.html-toolbar__group{border-right:1px solid var(--color-border);display:flex;gap:2px;margin-right:6px;padding-right:8px}.html-toolbar__group:last-child{border-right:none;margin-right:0;padding-right:0}.html-toolbar__btn{align-items:center;background:transparent;border:1px solid transparent;border-radius:4px;color:var(--color-text);cursor:pointer;display:inline-flex;font-family:inherit;font-size:13px;font-weight:600;height:30px;justify-content:center;min-width:30px;padding:4px 8px;transition:background var(--transition),border-color var(--transition)}.html-toolbar__btn:hover{background:var(--color-surface);border-color:var(--color-border)}.html-toolbar__btn:active{background:var(--color-primary);border-color:var(--color-primary);color:#fff}.html-toolbar__btn--bold{font-weight:800}.html-toolbar__btn--italic{font-style:italic}.html-toolbar__btn--underline{text-decoration:underline}.editor{background:var(--color-surface);border:1px solid var(--color-border);border-radius:8px;overflow:hidden}.editor__header{align-items:stretch;background:var(--color-bg);border-bottom:1px solid var(--color-border);display:flex}.editor__header .html-toolbar{background:transparent;border:none;border-radius:0;flex:1}.editor__modes{align-items:center;border-left:1px solid var(--color-border);display:flex;flex-shrink:0;gap:2px;padding:8px}.editor__mode-btn{background:transparent;border:1px solid transparent;border-radius:4px;color:var(--color-text-muted);cursor:pointer;font-family:inherit;font-size:12px;font-weight:600;padding:4px 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