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18px;font-family:inherit;font-size:14px;font-weight:500;line-height:1;text-decoration:none;transition:background-color .15s,border-color .15s,opacity .15s;display:inline-flex}.btn:disabled{opacity:.45;cursor:not-allowed}.btn--primary{background:var(--cta);color:var(--cta-text)}.btn--primary:hover:not(:disabled){background:var(--cta-active);color:var(--cta-text);text-decoration:none}.btn--secondary{background:var(--card);color:var(--ink);border-color:var(--hairline-strong)}.btn--secondary:hover:not(:disabled){background:var(--canvas-soft);color:var(--ink);text-decoration:none}.btn--text{color:var(--accent);background:0 0;height:auto;padding:0}.btn--text:hover:not(:disabled){color:var(--accent-strong);text-decoration:underline}.btn--sm{height:32px;padding:0 12px;font-size:13px}.card{background:var(--card);border:1px solid var(--hairline-strong);border-radius:var(--radius-lg);padding:var(--sp-lg)}.card--hover{transition:box-shadow .2s,transform .2s}.card--hover:hover{box-shadow:var(--shadow-soft)}.badge{background:var(--strong);color:var(--ink);letter-spacing:.88px;text-transform:uppercase;white-space:nowrap;border-radius:9999px;align-items:center;gap:6px;padding:4px 10px;font-family:inherit;font-size:11px;font-weight:600;display:inline-flex}.badge--done{background:var(--success)}@supports (color:color-mix(in lab, red, red)){.badge--done{background:color-mix(in srgb, var(--success) 14%, transparent)}}.badge--done{color:var(--success)}.badge--accent{background:var(--accent)}@supports (color:color-mix(in lab, red, red)){.badge--accent{background:color-mix(in srgb, var(--accent) 12%, transparent)}}.badge--accent{color:var(--accent)}button.badge{cursor:pointer;border:none}.account-btn{border:1px solid var(--hairline-strong);border-radius:var(--radius-md);background:var(--canvas);height:40px;color:var(--ink);font:inherit;cursor:pointer;-webkit-tap-highlight-color:transparent;align-items:center;gap:8px;padding:0 12px;font-size:14px;font-weight:500;line-height:1;transition:background-color .2s,border-color .2s,color .2s;display:inline-flex}.account-btn:hover{border-color:var(--accent);color:var(--accent)}.account-btn__avatar{object-fit:cover;border-radius:9999px;flex-shrink:0;display:block}.account-btn__label{text-overflow:ellipsis;white-space:nowrap;max-width:140px;overflow:hidden}.account-btn--loading{cursor:default;min-width:88px}@media (max-width:640px){.account-btn--loading{justify-content:center;width:40px;min-width:0;padding:0}.account-btn--loading .account-btn__skeleton{width:18px}.account-btn__label{text-overflow:ellipsis;white-space:nowrap;max-width:7ch;overflow:hidden}}.account-btn__skeleton{background:var(--hairline-strong);opacity:.6;border-radius:9999px;width:56px;height:12px;animation:1.2s ease-in-out infinite account-skeleton-pulse;display:block}@keyframes account-skeleton-pulse{0%,to{opacity:.35}50%{opacity:.7}}@media (prefers-reduced-motion:reduce){.account-btn__skeleton{animation:none}}.account-menu{z-index:50;background:var(--card);border:1px solid var(--hairline-strong);border-radius:var(--radius-lg);min-width:240px;max-width:300px;box-shadow:var(--shadow-soft);padding:var(--sp-sm);gap:var(--sp-xs);flex-direction:column;display:flex;position:absolute;top:calc(100% + 8px);right:0}.account-menu__item{text-align:left;border-radius:var(--radius-md);width:100%;font:inherit;color:var(--ink);cursor:pointer;background:0 0;border:none;padding:8px;font-size:14px;transition:background-color .15s;display:block}.account-menu__item:hover{background:var(--canvas-soft)}.references{border-top:1px solid var(--hairline);padding-top:var(--sp-base)}.references__title{color:var(--muted);letter-spacing:.02em;margin:0 0 8px;font-size:13px;font-weight:600}.references__list{flex-direction:column;gap:6px;margin:0;padding:0;list-style:none;display:flex}.references__link{color:var(--accent);font-size:14px;text-decoration:none}.references__link:hover{color:var(--accent-strong);text-decoration:underline}.text-button{cursor:pointer;font:inherit;color:var(--accent);background:0 0;border:none;padding:0;font-size:13px}.text-button:hover{text-decoration:underline}.level-chip{border-radius:var(--radius-xs);background:var(--strong);color:var(--body);white-space:nowrap;flex-shrink:0;align-items:center;padding:2px 8px;font-size:11px;font-weight:600;display:inline-flex}.input{width:100%;height:44px;font:inherit;color:var(--ink);background:var(--card);border:1px solid var(--hairline-strong);border-radius:var(--radius-md);padding:0 16px}.input:focus{border-width:2px;border-color:var(--ink);outline:none;padding:0 15px}.code-block{background:var(--dark);color:var(--on-dark);border-radius:var(--radius-lg);padding:var(--sp-md);font-family:var(--font-mono);tab-size:2;font-size:13px;line-height:1.6;overflow-x:auto}.code-block__head{justify-content:space-between;align-items:center;gap:var(--sp-sm);margin-bottom:var(--sp-xs);color:var(--on-dark-soft);font-size:12px;display:flex}.code-block__copy{color:var(--on-dark);border-radius:var(--radius-sm);font:inherit;cursor:pointer;background:0 0;border:1px solid #ffffff2e;flex-shrink:0;padding:2px 8px;font-size:12px}.code-block__copy:hover{border-color:#fff6}.code-block__pre{margin:0;overflow-x:auto}.alert{border-radius:var(--radius-md);padding:var(--sp-sm) var(--sp-base);border:1px solid #0000;font-size:14px}.alert--error{color:var(--error);border-color:var(--error);background:var(--error)}@supports (color:color-mix(in lab, red, red)){.alert--error{background:color-mix(in srgb, var(--error) 6%, transparent)}}.alert--success{color:var(--success);border-color:var(--success);background:var(--success)}@supports (color:color-mix(in lab, red, red)){.alert--success{background:color-mix(in srgb, var(--success) 6%, transparent)}}.alert--warning{color:var(--ink);border-color:var(--warning);background:var(--warning)}@supports (color:color-mix(in lab, red, red)){.alert--warning{background:color-mix(in srgb, var(--warning) 6%, transparent)}}.theme-toggle{border:1px solid var(--hairline-strong);border-radius:var(--radius-md);background:var(--canvas);width:40px;height:40px;color:var(--ink);cursor:pointer;-webkit-tap-highlight-color:transparent;flex-shrink:0;justify-content:center;align-items:center;padding:0;transition:background-color .2s,border-color .2s,color .2s;display:inline-flex}.theme-toggle:hover{border-color:var(--accent);color:var(--accent)}.theme-toggle svg{width:20px;height:20px;display:block}.row{gap:var(--sp-xs);flex-wrap:wrap;align-items:center;display:flex}:not(pre)>code{font-family:var(--font-mono);background:var(--strong);color:var(--ink);border-radius:var(--radius-xs);word-break:break-word;padding:1px 5px;font-size:.9em}.explain-point{gap:var(--sp-sm);align-items:flex-start;display:flex}.explain-point+.explain-point{border-top:1px solid var(--hairline);padding-top:var(--sp-base)}.explain-point__num{border-radius:var(--radius-md);background:var(--accent);flex-shrink:0;justify-content:center;align-items:center;width:26px;height:26px;display:inline-flex}@supports (color:color-mix(in lab, red, red)){.explain-point__num{background:color-mix(in srgb, var(--accent) 12%, transparent)}}.explain-point__num{color:var(--accent);margin-top:1px;font-size:13px;font-weight:600}.explain-point__title{color:var(--ink);margin:0;font-size:15px;font-weight:600;line-height:1.5}.explain-point__body{color:var(--body);margin:4px 0 0;font-size:14.5px;line-height:1.75}.why-callout{border-left:3px solid var(--accent);background:var(--canvas-soft);border-radius:var(--radius-md);padding:var(--sp-sm) var(--sp-base)}.why-callout p{margin:0}.step-tab{border-radius:var(--radius-md);border:1px solid var(--hairline-strong);color:var(--body);font:inherit;cursor:pointer;background:0 0;align-items:center;gap:8px;padding:6px 12px;font-size:13px;font-weight:500;transition:border-color .18s,background-color .18s,color .18s;display:inline-flex}.step-tab.is-active{border-color:var(--ink);background:var(--strong);color:var(--ink)}.step-tab__dot{border:2px solid var(--muted);background:0 0;border-radius:9999px;width:10px;height:10px;display:inline-block}.step-tab.is-active .step-tab__dot,.step-tab.is-cleared .step-tab__dot{background:var(--accent);border:none}.quiz-option{text-align:left;width:100%;padding:var(--sp-sm) var(--sp-base);border-radius:var(--radius-md);border:1px solid var(--hairline-strong);background:var(--card);color:var(--ink);font:inherit;cursor:pointer;align-items:flex-start;gap:10px;transition:border-color .18s,background-color .18s,color .18s,transform .12s;display:flex}.quiz-option:hover:not(:disabled):not(.is-selected){border-color:var(--ink);background:var(--canvas-soft)}.quiz-option:active:not(:disabled){transform:scale(.995)}.quiz-option:disabled{cursor:default}.quiz-option__radio{border:2px solid var(--muted);background:0 0;border-radius:9999px;flex-shrink:0;width:18px;height:18px;margin-top:2px;transition:border-color .18s,background-color .18s,box-shadow .18s}.quiz-option.is-selected{border-color:var(--accent);background:var(--accent)}@supports (color:color-mix(in lab, red, red)){.quiz-option.is-selected{background:color-mix(in srgb, var(--accent) 8%, transparent)}}.quiz-option.is-selected{box-shadow:inset 0 0 0 1px var(--accent)}.quiz-option.is-selected .quiz-option__radio{border-color:var(--accent);background:var(--accent);box-shadow:inset 0 0 0 3px var(--card)}.quiz-option.is-correct{border-color:var(--success);background:var(--success)}@supports (color:color-mix(in lab, red, red)){.quiz-option.is-correct{background:color-mix(in srgb, var(--success) 8%, transparent)}}.quiz-option.is-correct .quiz-option__radio{border-color:var(--success);background:var(--success);box-shadow:inset 0 0 0 3px var(--card)}.quiz-option.is-wrong{border-color:var(--error);background:var(--error)}@supports (color:color-mix(in lab, red, red)){.quiz-option.is-wrong{background:color-mix(in srgb, var(--error) 8%, transparent)}}.quiz-option.is-wrong .quiz-option__radio{border-color:var(--error);background:var(--error);box-shadow:inset 0 0 0 3px var(--card)}.quiz-question{border:0;min-width:0;margin:0;padding:0}.quiz-question legend{color:var(--ink);padding:0;font-size:18px;font-weight:600;line-height:1.5}.prose-body{color:var(--body);line-height:1.85}.prose-body strong{color:var(--ink);font-weight:600}.hairline-t{border-top:1px solid var(--hairline)}.hairline-b{border-bottom:1px solid var(--hairline)}.cat-basics{--cat:#2563eb}.cat-theme{--cat:#16a34a}.cat-data{--cat:#b8860b}.cat-quality{--cat:#0e7490}.cat-extend{--cat:#7c3aed}.cat-api{--cat:#c2410c}.cat-business{--cat:#be185d}[data-theme=dark] .cat-basics{--cat:#8bbcff}[data-theme=dark] .cat-theme{--cat:#4ade80}[data-theme=dark] .cat-data{--cat:#e0b64a}[data-theme=dark] .cat-quality{--cat:#4bb8cf}[data-theme=dark] .cat-extend{--cat:#b18aff}[data-theme=dark] .cat-api{--cat:#ff9060}[data-theme=dark] .cat-business{--cat:#f472b6}@media (prefers-color-scheme:dark){:root:not([data-theme=light]) .cat-basics{--cat:#8bbcff}:root:not([data-theme=light]) .cat-theme{--cat:#4ade80}:root:not([data-theme=light]) .cat-data{--cat:#e0b64a}:root:not([data-theme=light]) .cat-quality{--cat:#4bb8cf}:root:not([data-theme=light]) .cat-extend{--cat:#b18aff}:root:not([data-theme=light]) .cat-api{--cat:#ff9060}:root:not([data-theme=light]) .cat-business{--cat:#f472b6}}.cat-ink{color:var(--cat,var(--muted))}.phase-details{background:var(--card);border:1px solid var(--hairline);border-radius:14px;overflow:hidden}.phase-details>summary::-webkit-details-marker{display:none}.cat-bar{background:var(--cat,var(--hairline))}.topic-link{color:var(--body);text-decoration:none}.topic-link:hover{color:var(--accent);background:var(--canvas-soft);text-decoration:none}.pill{border:1px solid var(--hairline);color:var(--muted);white-space:nowrap;border-radius:999px;align-items:center;gap:4px;padding:2px 10px;font-size:12px;font-weight:600;display:inline-flex}.pill-done{border-color:var(--success)}@supports (color:color-mix(in lab, red, red)){.pill-done{border-color:color-mix(in srgb, var(--success) 45%, transparent)}}.pill-done{color:var(--success)}.meter{background:var(--strong);border-radius:9999px;height:8px;overflow:hidden}.meter>span{background:var(--accent);border-radius:9999px;height:100%;transition:width .3s;display:block}.data-table{border-collapse:collapse;width:100%;font-size:14px}.data-table th,.data-table td{border:1px solid var(--hairline);text-align:left;vertical-align:top;padding:8px 12px}.data-table th{background:var(--strong);color:var(--ink);white-space:nowrap;font-weight:600}.tabs{border-bottom:1px solid var(--hairline);flex-wrap:wrap;gap:8px;display:flex}.tab{color:var(--muted);font:inherit;cursor:pointer;background:0 0;border:0;border-bottom:2px solid #0000;margin-bottom:-1px;padding:6px 10px;font-size:12px;font-weight:600}.tab.is-active{border-bottom-color:var(--accent);color:var(--ink)}.howto-step{gap:var(--sp-sm);align-items:flex-start;display:flex}.howto-step+.howto-step{border-top:1px solid var(--hairline);padding-top:var(--sp-base)}.exercise-editor{resize:vertical;border:none;outline:none;width:100%;min-height:160px}.exercise-editor:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.html-preview{border:1px solid var(--hairline-strong);border-radius:var(--radius-md);background:#fff;width:100%;height:12rem;display:block}.disclosure>summary{cursor:pointer;color:var(--ink);font-size:14px;font-weight:600}@property --tw-border-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-leading{syntax:"*";inherits:false}@property --tw-font-weight{syntax:"*";inherits:false}@property --tw-tracking{syntax:"*";inherits:false}@property --tw-ordinal{syntax:"*";inherits:false}@property --tw-slashed-zero{syntax:"*";inherits:false}@property --tw-numeric-figure{syntax:"*";inherits:false}@property --tw-numeric-spacing{syntax:"*";inherits:false}@property --tw-numeric-fraction{syntax:"*";inherits:false}@property --tw-outline-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-blur{syntax:"*";inherits:false}@property --tw-brightness{syntax:"*";inherits:false}@property --tw-contrast{syntax:"*";inherits:false}@property --tw-grayscale{syntax:"*";inherits:false}@property --tw-hue-rotate{syntax:"*";inherits:false}@property --tw-invert{syntax:"*";inherits:false}@property --tw-opacity{syntax:"*";inherits:false}@property --tw-saturate{syntax:"*";inherits:false}@property --tw-sepia{syntax:"*";inherits:false}@property --tw-drop-shadow{syntax:"*";inherits:false}@property --tw-drop-shadow-color{syntax:"*";inherits:false}@property --tw-drop-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-drop-shadow-size{syntax:"*";inherits:false}