:root{--yellow: #fff8dc;--yellow-deep: #f4ead0;--blue: #e0f4ff;--blue-deep: #cbe9f7;--blue-line: #a9d4e8;--ink: #2b2b2b;--ink-soft: #55585c;--ink-faint: #7a7d82;--accent: #2f6f8f;--accent-dark: #245a74;--surface: #ffffff;--border: #e2ddc9;--border-blue: #bfe0ef;--radius: 10px;--shadow: 0 1px 3px rgba(60, 55, 30, .08);--maxw: 1180px;--font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, "Helvetica Neue", sans-serif;--focus: 3px solid #1f5e7d}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:var(--font);font-size:16px;line-height:1.6;color:var(--ink);background:var(--yellow);-webkit-font-smoothing:antialiased}h1,h2,h3,h4{line-height:1.25;color:var(--ink);margin:0 0 .5em;font-weight:650}p{margin:0 0 1em}a{color:var(--accent)}button{font-family:inherit;font-size:inherit;cursor:pointer}:focus-visible{outline:var(--focus);outline-offset:2px;border-radius:4px}.skip-link{position:absolute;left:8px;top:-48px;background:var(--surface);color:var(--accent-dark);padding:10px 16px;border-radius:var(--radius);border:1px solid var(--border-blue);z-index:100;transition:top .15s ease}.skip-link:focus{top:8px}.app-header{background:var(--blue);border-bottom:1px solid var(--border-blue)}.app-header__inner{max-width:var(--maxw);margin:0 auto;padding:22px 20px 24px}.app-header h1{margin:0 0 4px;font-size:1.5rem;letter-spacing:.2px}.app-header__tagline{margin:0;color:var(--ink-soft);font-size:.95rem;max-width:60ch}.layout{max-width:var(--maxw);margin:0 auto;padding:20px;display:grid;grid-template-columns:1fr;gap:22px}.main-column{min-width:0}.search{position:relative;margin-bottom:22px}.search__label{display:block;font-weight:600;margin-bottom:6px;font-size:.95rem}.search__input{width:100%;padding:12px 40px 12px 14px;font-size:1rem;border:1px solid var(--border-blue);border-radius:var(--radius);background:var(--surface);color:var(--ink)}.search__clear{position:absolute;right:8px;bottom:8px;border:none;background:transparent;color:var(--ink-faint);font-size:1.3rem;line-height:1;padding:4px 8px}.search__results{margin-top:10px;border:1px solid var(--border-blue);border-radius:var(--radius);background:var(--surface);overflow:hidden}.search__meta{padding:8px 14px;font-size:.85rem;color:var(--ink-soft);background:var(--blue);border-bottom:1px solid var(--border-blue)}.search__result{display:block;width:100%;text-align:left;border:none;border-bottom:1px solid var(--border);background:var(--surface);padding:12px 14px}.search__result:last-child{border-bottom:none}.search__result:hover,.search__result:focus-visible{background:var(--yellow)}.search__result-part{font-size:.78rem;text-transform:uppercase;letter-spacing:.06em;color:var(--accent-dark);font-weight:700}.search__result-title{font-weight:650;margin:2px 0 4px}.search__result-snippet{font-size:.9rem;color:var(--ink-soft);margin:0}.search__empty{padding:14px;color:var(--ink-soft);font-size:.92rem}mark{background:#ffe9a8;color:inherit;padding:0 1px;border-radius:2px}.nav{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden}.nav__heading{font-size:.8rem;text-transform:uppercase;letter-spacing:.08em;color:var(--ink-faint);padding:14px 16px 6px;margin:0}.nav__part{border-top:1px solid var(--border)}.nav__part:first-of-type{border-top:none}.nav__part-button{width:100%;display:flex;align-items:baseline;justify-content:space-between;gap:10px;text-align:left;border:none;background:transparent;padding:13px 16px;color:var(--ink)}.nav__part-button:hover{background:var(--yellow)}.nav__part-button[aria-expanded=true]{background:var(--yellow-deep)}.nav__part-name{font-weight:650;font-size:1rem}.nav__part-summary{display:block;font-weight:400;font-size:.82rem;color:var(--ink-soft);margin-top:2px}.nav__chevron{flex:none;font-size:.8rem;color:var(--ink-faint);transform:rotate(0)}.nav__part-button[aria-expanded=true] .nav__chevron{transform:rotate(90deg)}.nav__lessons{list-style:none;margin:0;padding:4px 0 10px;background:var(--surface)}.nav__lesson-button{width:100%;text-align:left;border:none;background:transparent;padding:8px 16px 8px 28px;color:var(--accent-dark);font-size:.93rem}.nav__lesson-button:hover{background:var(--blue);text-decoration:underline}.nav__lesson-button[aria-current=true]{background:var(--blue-deep);font-weight:650;border-left:3px solid var(--accent);padding-left:25px}.lessons-region{display:flex;flex-direction:column;gap:18px}.lesson-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:20px;scroll-margin-top:16px}.lesson-card__part{font-size:.78rem;text-transform:uppercase;letter-spacing:.06em;color:var(--accent-dark);font-weight:700;margin-bottom:2px}.lesson-card__title{font-size:1.25rem;margin-bottom:10px}.lesson-card__content{color:var(--ink)}.lesson-card__section{margin-top:16px;padding-top:14px;border-top:1px dashed var(--border)}.lesson-card__section h4{font-size:.95rem;margin-bottom:8px;color:var(--accent-dark)}.lesson-card__section ul{margin:0;padding-left:20px}.lesson-card__section li{margin-bottom:6px}.lesson-card__section--questions{background:var(--yellow);border:1px solid var(--border);border-radius:8px;padding:12px 14px;margin-top:16px}.lesson-card.is-highlighted{animation:flash 1.8s ease-out}@keyframes flash{0%,30%{box-shadow:0 0 0 3px #ffe08a}to{box-shadow:var(--shadow)}}@media (prefers-reduced-motion: reduce){html{scroll-behavior:auto}.lesson-card.is-highlighted{animation:none;box-shadow:0 0 0 3px #ffe08a}}.section-intro{color:var(--ink-soft);font-size:.95rem;margin-bottom:4px}.qa{background:var(--blue);border:1px solid var(--border-blue);border-radius:var(--radius);padding:20px;margin-top:28px}.qa h2{font-size:1.2rem;margin-bottom:4px}.qa__form{display:flex;flex-direction:column;gap:10px;margin-top:12px}.qa__textarea{width:100%;min-height:90px;resize:vertical;padding:12px 14px;font-size:1rem;font-family:inherit;border:1px solid var(--border-blue);border-radius:var(--radius);background:var(--surface);color:var(--ink)}.button{align-self:flex-start;background:var(--accent);color:#fff;border:1px solid var(--accent-dark);padding:10px 20px;border-radius:var(--radius);font-weight:600}.button:hover{background:var(--accent-dark)}.button--ghost{background:transparent;color:var(--accent-dark);border:1px solid var(--border-blue)}.button--ghost:hover{background:var(--surface)}.button--small{padding:6px 12px;font-size:.85rem}.qa__results{margin-top:18px;background:var(--surface);border:1px solid var(--border-blue);border-radius:var(--radius);padding:16px}.qa__results h3{font-size:1rem;margin-bottom:8px;color:var(--accent-dark)}.qa__result-list{list-style:none;margin:0 0 16px;padding:0}.qa__result-list li{padding:10px 0;border-bottom:1px solid var(--border)}.qa__result-list li:last-child{border-bottom:none}.qa__result-link{background:none;border:none;padding:0;color:var(--accent-dark);font-weight:650;text-align:left;text-decoration:underline}.qa__result-snippet{display:block;color:var(--ink-soft);font-size:.9rem;margin-top:3px}.qa__doctor-list{margin:0;padding-left:20px}.qa__doctor-list li{margin-bottom:7px}.qa__doctor-list .qa__from{color:var(--ink-faint);font-size:.82rem}.qa__nomatch{color:var(--ink-soft);font-size:.93rem}.disclaimer{font-size:.82rem;color:var(--ink-soft);margin-top:14px;padding-top:12px;border-top:1px solid var(--border-blue)}.history{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:16px}.history__head{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:10px}.history__head h2{font-size:1rem;margin:0}.history__empty{color:var(--ink-faint);font-size:.9rem}.history__list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:10px;max-height:460px;overflow-y:auto}.history__item{border:1px solid var(--border);border-radius:8px;padding:10px 12px;background:var(--yellow)}.history__q{font-weight:600;font-size:.9rem;margin:0 0 4px}.history__lessons{font-size:.83rem;color:var(--ink-soft);margin:0}.history__lessons button{background:none;border:none;padding:0;color:var(--accent-dark);text-decoration:underline;font-size:inherit}.history__time{display:block;font-size:.75rem;color:var(--ink-faint);margin-top:6px}.app-footer{max-width:var(--maxw);margin:0 auto;padding:24px 20px 40px;color:var(--ink-faint);font-size:.82rem}@media (min-width: 900px){.layout{grid-template-columns:260px minmax(0,1fr) 280px;align-items:start}.nav,.history{position:sticky;top:16px}.app-header h1{font-size:1.75rem}}@media (min-width: 600px) and (max-width: 899px){.layout{grid-template-columns:240px minmax(0,1fr)}.history{grid-column:1 / -1}}