:root{--plum: #4c2a47;--plum-soft: #6e3a58;--gold: #ffdc87;--gold-deep: #e8b84b;--font-sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;--font-mono: ui-monospace, "SF Mono", "JetBrains Mono", "Fira Code", Menlo, Consolas, monospace;--radius-sm: 8px;--radius-md: 12px;--radius-lg: 18px;--maxw: 920px;--sidebar-w: 280px;--header-h: 60px;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .06);--shadow-md: 0 6px 20px rgba(0, 0, 0, .08)}:root,[data-theme=light]{--bg: #faf8f5;--bg-elev: #ffffff;--bg-sidebar: #f5f1ea;--bg-code: #2b2233;--surface: #ffffff;--surface-2: #f3eee7;--text: #2a2230;--text-soft: #5d5566;--text-faint: #8a8290;--border: #e7e0d6;--border-strong: #d8cfc1;--accent: var(--plum);--accent-contrast: #ffffff;--link: #7a3f6b;--code-text: #f3eef6}[data-theme=dark]{--bg: #16121a;--bg-elev: #1e1924;--bg-sidebar: #1a1620;--bg-code: #120e16;--surface: #221c29;--surface-2: #2a2332;--text: #ece7f0;--text-soft: #b6adc0;--text-faint: #837a8e;--border: #322b3b;--border-strong: #423a4d;--accent: var(--gold);--accent-contrast: #2a1f28;--link: #f0c869;--code-text: #f3eef6}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:var(--font-sans);background:var(--bg);color:var(--text);line-height:1.65;-webkit-font-smoothing:antialiased;transition:background .25s ease,color .25s ease}a{color:var(--link);text-decoration:none;font-weight:500}a:hover{text-decoration:underline}h1,h2,h3,h4{line-height:1.25;color:var(--text);scroll-margin-top:calc(var(--header-h) + 16px)}h1{font-size:2.1rem;margin:0 0 .5rem;letter-spacing:-.02em}h2{font-size:1.5rem;margin:2.5rem 0 1rem;padding-bottom:.4rem;border-bottom:1px solid var(--border)}h3{font-size:1.18rem;margin:1.8rem 0 .6rem}p{margin:0 0 1rem}ul,ol{margin:0 0 1rem;padding-left:1.3rem}li{margin-bottom:.4rem}code{font-family:var(--font-mono);font-size:.86em}:not(pre)>code{background:var(--surface-2);color:var(--accent);padding:.12em .42em;border-radius:6px;border:1px solid var(--border);white-space:nowrap}[data-theme=dark] :not(pre)>code{color:var(--gold)}hr{border:none;border-top:1px solid var(--border);margin:2.5rem 0}strong{color:var(--text);font-weight:700}.app{min-height:100vh}.layout{display:flex}.header{position:sticky;top:0;z-index:30;height:var(--header-h);display:flex;align-items:center;gap:12px;padding:0 18px;background:color-mix(in srgb,var(--bg-elev) 88%,transparent);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-bottom:1px solid var(--border)}.header__brand{display:flex;align-items:center;gap:10px;font-weight:700;letter-spacing:-.01em}.header__logo{width:30px;height:30px;border-radius:8px;background:linear-gradient(135deg,var(--plum),var(--plum-soft));display:grid;place-items:center;color:var(--gold);font-weight:800;font-size:.95rem;box-shadow:var(--shadow-sm)}.header__spacer{flex:1}.header__hint{color:var(--text-faint);font-size:.82rem}.menu-btn{display:none;background:var(--surface-2);border:1px solid var(--border);color:var(--text);border-radius:var(--radius-sm);width:38px;height:38px;font-size:1.1rem;cursor:pointer}.collapse-btn{display:grid;place-items:center;background:var(--surface-2);border:1px solid var(--border);color:var(--text);border-radius:var(--radius-sm);width:38px;height:38px;font-size:1.05rem;cursor:pointer;flex-shrink:0;transition:background .15s ease}.collapse-btn:hover{background:var(--surface)}.collapse-btn__icon{display:inline-block;transition:transform .25s ease}.collapse-btn--collapsed .collapse-btn__icon{transform:rotate(180deg)}.sidebar{position:sticky;top:var(--header-h);align-self:flex-start;height:calc(100vh - var(--header-h));width:var(--sidebar-w);flex-shrink:0;overflow:hidden;background:var(--bg-sidebar);border-right:1px solid var(--border);transition:width .25s ease}.sidebar__inner{width:var(--sidebar-w);height:100%;overflow-y:auto;padding:18px 12px 60px}.layout--collapsed .sidebar{width:0;border-right-color:transparent}.sidebar__group-title{font-size:.72rem;text-transform:uppercase;letter-spacing:.08em;color:var(--text-faint);font-weight:700;margin:18px 12px 6px}.nav-item{display:flex;align-items:center;gap:10px;width:100%;text-align:left;background:none;border:none;color:var(--text-soft);font-family:inherit;font-size:.92rem;padding:8px 12px;border-radius:var(--radius-sm);cursor:pointer;transition:background .15s ease,color .15s ease}.nav-item:hover{background:var(--surface-2);color:var(--text)}.nav-item--active{background:var(--accent);color:var(--accent-contrast);font-weight:600}.nav-item--active:hover{background:var(--accent);color:var(--accent-contrast)}.nav-item__num{font-size:.72rem;font-variant-numeric:tabular-nums;opacity:.6;min-width:20px}.content{flex:1;min-width:0;display:flex;justify-content:center;padding:38px 28px 80px}.page{width:100%;max-width:var(--maxw);animation:fade .3s ease}@keyframes fade{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}.page__kicker{display:inline-block;font-size:.74rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--accent);background:color-mix(in srgb,var(--accent) 14%,transparent);padding:4px 10px;border-radius:999px;margin-bottom:12px}.page__lead{font-size:1.12rem;color:var(--text-soft);margin-bottom:1.5rem}.callout{display:flex;gap:12px;padding:14px 16px;border-radius:var(--radius-md);margin:1.3rem 0;border:1px solid var(--border);background:var(--surface);font-size:.96rem}.callout__icon{font-size:1.15rem;line-height:1.5}.callout__body{flex:1;min-width:0}.callout__body>:last-child{margin-bottom:0}.callout--info{border-left:4px solid #3b82f6}.callout--tip{border-left:4px solid #10b981}.callout--warning{border-left:4px solid #f59e0b}.callout--danger{border-left:4px solid #ef4444}.callout--rule{border-left:4px solid var(--accent);background:color-mix(in srgb,var(--accent) 8%,var(--surface))}.code{position:relative;margin:1.3rem 0;border-radius:var(--radius-md);overflow:hidden;border:1px solid var(--border-strong);background:var(--bg-code);box-shadow:var(--shadow-sm)}.code__bar{display:flex;align-items:center;justify-content:space-between;padding:7px 12px;background:#ffffff0a;border-bottom:1px solid rgba(255,255,255,.07)}.code__lang{font-family:var(--font-mono);font-size:.72rem;letter-spacing:.05em;text-transform:uppercase;color:#b9aec6}.code__copy{background:#ffffff14;border:1px solid rgba(255,255,255,.12);color:#e7dff0;font-family:inherit;font-size:.74rem;padding:4px 10px;border-radius:6px;cursor:pointer;transition:background .15s ease}.code__copy:hover{background:#ffffff29}.code__copy--done{color:var(--gold)}.code pre{margin:0;padding:14px 16px;overflow-x:auto}.code code{font-family:var(--font-mono);font-size:.84rem;line-height:1.6;color:var(--code-text);white-space:pre}.table-wrap{overflow-x:auto;margin:1.3rem 0;border:1px solid var(--border);border-radius:var(--radius-md)}table{width:100%;border-collapse:collapse;font-size:.92rem}th,td{text-align:left;padding:10px 14px;border-bottom:1px solid var(--border);vertical-align:top}th{background:var(--surface-2);font-weight:700;font-size:.82rem;text-transform:uppercase;letter-spacing:.03em;color:var(--text-soft)}tr:last-child td{border-bottom:none}tbody tr:hover{background:color-mix(in srgb,var(--accent) 5%,transparent)}.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:14px;margin:1.3rem 0}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-md);padding:16px;box-shadow:var(--shadow-sm)}.card h4{margin:0 0 6px;font-size:1rem}.card p{margin:0;font-size:.9rem;color:var(--text-soft)}.card__emoji{font-size:1.4rem;display:block;margin-bottom:6px}.tree{font-family:var(--font-mono);font-size:.84rem;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-md);padding:16px 18px;margin:1.3rem 0;line-height:1.8;overflow-x:auto}.tree .t-dir{color:var(--accent);font-weight:700}[data-theme=dark] .tree .t-dir{color:var(--gold)}.tree .t-note{color:var(--text-faint)}.pill{display:inline-block;font-size:.74rem;font-weight:600;padding:2px 9px;border-radius:999px;border:1px solid var(--border-strong);background:var(--surface-2);color:var(--text-soft)}.pill--shared{border-color:#10b981;color:#0d9268;background:#10b9811a}.pill--data{border-color:var(--gold-deep);color:var(--gold-deep);background:#e8b84b1f}.steps{counter-reset:step;list-style:none;padding:0;margin:1.3rem 0}.steps li{position:relative;padding-left:46px;margin-bottom:18px}.steps li:before{counter-increment:step;content:counter(step);position:absolute;left:0;top:-2px;width:30px;height:30px;display:grid;place-items:center;border-radius:50%;background:var(--accent);color:var(--accent-contrast);font-weight:700;font-size:.9rem}.pager{display:flex;justify-content:space-between;gap:12px;margin-top:48px;padding-top:24px;border-top:1px solid var(--border)}.pager__btn{flex:1;max-width:48%;text-align:left;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-md);padding:12px 16px;cursor:pointer;color:var(--text);font-family:inherit;transition:border-color .15s ease,transform .15s ease}.pager__btn:hover{border-color:var(--accent);transform:translateY(-2px)}.pager__btn--next{text-align:right}.pager__dir{font-size:.74rem;color:var(--text-faint);display:block}.pager__title{font-weight:600}.pager__btn--empty{visibility:hidden}.toggle{background:var(--surface-2);border:1px solid var(--border);color:var(--text);border-radius:999px;height:38px;padding:0 14px;display:inline-flex;align-items:center;gap:7px;cursor:pointer;font-family:inherit;font-size:.85rem;transition:background .15s ease}.toggle:hover{background:var(--border)}.hero{background:linear-gradient(135deg,var(--plum),var(--plum-soft));color:#fff;border-radius:var(--radius-lg);padding:36px 32px;margin-bottom:28px;box-shadow:var(--shadow-md)}.hero h1{color:#fff;font-size:2.3rem}.hero p{color:#ffffffd9;font-size:1.1rem;margin:0}.hero__tag{color:var(--gold);font-weight:700;letter-spacing:.05em;text-transform:uppercase;font-size:.78rem}.term{position:relative;display:inline}.term__word{font:inherit;color:inherit;background:none;border:none;padding:0;cursor:help;font-weight:600;text-decoration:underline dotted;text-decoration-color:var(--accent);text-underline-offset:3px;text-decoration-thickness:1.5px}.term__word:hover{color:var(--accent)}[data-theme=dark] .term__word:hover{color:var(--gold)}.term__pop{position:absolute;bottom:calc(100% + 10px);left:50%;transform:translate(-50%) translateY(4px);width:max-content;max-width:280px;z-index:60;background:var(--bg-code);color:#ece7f0;border:1px solid var(--border-strong);border-radius:var(--radius-md);padding:10px 13px;font-size:.85rem;font-weight:400;line-height:1.5;text-align:left;box-shadow:var(--shadow-md);opacity:0;visibility:hidden;pointer-events:none;transition:opacity .15s ease,transform .15s ease}.term__pop-title{display:block;color:var(--gold);margin-bottom:3px;font-size:.8rem}.term__pop:after{content:"";position:absolute;top:100%;left:50%;transform:translate(-50%);border:6px solid transparent;border-top-color:var(--bg-code)}.term:hover .term__pop,.term:focus-within .term__pop,.term--open .term__pop{opacity:1;visibility:visible;transform:translate(-50%) translateY(0)}.kbd{font-family:var(--font-mono);font-size:.8rem;background:var(--surface-2);border:1px solid var(--border-strong);border-bottom-width:2px;border-radius:6px;padding:1px 7px}.lead-list li{margin-bottom:.7rem}.center-note{text-align:center;color:var(--text-faint);font-size:.85rem;margin-top:40px}.course-area{--accent: #008060;--accent-contrast: #ffffff;--link: #0a7f63}[data-theme=dark] .course-area{--accent: #4cc4a0;--accent-contrast: #07241d;--link: #5fd3b0}.header__logo--course{background:linear-gradient(135deg,#008060,#00a37a);color:#fff}.course-cta,.course-banner{display:flex;align-items:center;gap:12px;width:100%;text-align:left;cursor:pointer;border:none;font-family:inherit;color:#fff;background:linear-gradient(135deg,#008060,#00a37a);box-shadow:var(--shadow-sm);transition:transform .15s ease,box-shadow .15s ease}.course-cta:hover,.course-banner:hover{transform:translateY(-2px);box-shadow:var(--shadow-md)}.course-cta{border-radius:var(--radius-md);padding:11px 13px;margin-bottom:14px}.course-cta__emoji{font-size:1.35rem}.course-cta__text{display:flex;flex-direction:column;line-height:1.25}.course-cta__text strong{color:#fff;font-size:.92rem}.course-cta__text span{font-size:.76rem;opacity:.9}.course-banner{gap:16px;border-radius:var(--radius-lg);padding:20px 22px;margin:0 0 24px;box-shadow:var(--shadow-md)}.course-banner__emoji{font-size:2rem}.course-banner__text{display:flex;flex-direction:column;gap:4px}.course-banner__text strong{color:#fff;font-size:1.1rem}.course-banner__text span{color:#ffffffe6;font-size:.92rem}.course-back{background:none;border:none;color:var(--text-soft);cursor:pointer;font-family:inherit;font-size:.85rem;padding:4px 8px;margin-bottom:8px;border-radius:6px}.course-back:hover{color:var(--accent)}.course-sidebar__head{padding:2px 12px 12px;border-bottom:1px solid var(--border);margin-bottom:8px}.course-sidebar__title{font-weight:800;font-size:1.05rem}.course-sidebar__sub{font-size:.74rem;color:var(--text-faint);margin-top:2px}.course-module{margin-bottom:2px}.course-module__btn{display:flex;align-items:center;gap:10px;width:100%;text-align:left;background:none;border:none;cursor:pointer;font-family:inherit;color:var(--text);padding:9px 10px;border-radius:var(--radius-sm)}.course-module__btn:hover{background:var(--surface-2)}.course-module__btn--active .course-module__name{color:var(--accent)}.course-module__emoji{font-size:1.1rem}.course-module__name{flex:1;display:flex;flex-direction:column;line-height:1.2;font-size:.9rem;font-weight:600}.course-module__num{font-size:.66rem;font-weight:700;letter-spacing:.05em;text-transform:uppercase;color:var(--text-faint)}.course-module__chevron{transition:transform .2s ease;color:var(--text-faint);font-size:1.2rem;line-height:1}.course-module__chevron.is-open{transform:rotate(90deg)}.course-module__lessons{margin:2px 0 8px 16px;border-left:2px solid var(--border);padding-left:6px;display:flex;flex-direction:column}.course-lesson{display:flex;align-items:center;gap:8px;width:100%;text-align:left;background:none;border:none;cursor:pointer;font-family:inherit;color:var(--text-soft);font-size:.85rem;padding:7px 10px;border-radius:var(--radius-sm)}.course-lesson:hover{background:var(--surface-2);color:var(--text)}.course-lesson--active,.course-lesson--active:hover{background:var(--accent);color:var(--accent-contrast);font-weight:600}.course-lesson__dot{width:6px;height:6px;border-radius:50%;background:currentColor;opacity:.5;flex-shrink:0}.lesson__meta{color:var(--text-faint);font-size:.85rem;margin:-2px 0 1.2rem}.course-note{font-size:.9rem;color:var(--text-soft);background:var(--surface-2);border-radius:var(--radius-sm);padding:8px 12px;border-left:3px solid var(--border-strong)}.quiz{margin:1.3rem 0;border:1px solid var(--border);border-radius:var(--radius-md);background:var(--surface);overflow:hidden}.quiz summary{cursor:pointer;padding:12px 16px;font-weight:600;list-style:none;display:flex;gap:9px;align-items:baseline}.quiz summary::-webkit-details-marker{display:none}.quiz summary:hover{background:var(--surface-2)}.quiz__tag{font-size:.68rem;text-transform:uppercase;letter-spacing:.05em;font-weight:700;color:var(--accent-contrast);background:var(--accent);padding:2px 9px;border-radius:999px;flex-shrink:0}.quiz[open] summary{border-bottom:1px solid var(--border)}.quiz__answer{padding:12px 16px;color:var(--text-soft);font-size:.95rem}.backdrop{display:none}@media (max-width: 1024px){.menu-btn{display:grid;place-items:center}.collapse-btn{display:none}.sidebar,.layout--collapsed .sidebar{position:fixed;top:var(--header-h);left:0;z-index:40;width:var(--sidebar-w);transform:translate(-100%);transition:transform .25s ease;box-shadow:var(--shadow-md)}.sidebar--open{transform:translate(0)}.backdrop--show{display:block;position:fixed;inset:var(--header-h) 0 0 0;background:#0006;z-index:35}.content{padding:24px 18px 70px}.header__hint{display:none}h1{font-size:1.7rem}.hero h1{font-size:1.8rem}}