:root{--background: #f7faf9;--surface: #ffffff;--surface-muted: #eef7f4;--text: #172521;--muted: #566b64;--border: #d7e4e0;--primary: #0b6b5d;--primary-dark: #074b42;--accent: #d9a441;--code: #10231f;--shadow: 0 1rem 2.5rem rgba(13, 49, 42, 0.08);--radius: 1rem;--content-width: 72rem;--reading-width: 68ch}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--background);color:var(--text);font-family:Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;font-size:1rem;line-height:1.7;text-rendering:optimizeLegibility}body:not(.language-ready) [data-lang="vi"],html[lang="vi"] [data-lang="en"],html[lang="en"] [data-lang="vi"]{display:none !important}a{color:var(--primary);text-decoration-thickness:0.08em;text-underline-offset:0.18em}a:hover{color:var(--primary-dark)}img,svg{max-width:100%;height:auto}img{border-radius:0.75rem}.skip-link{position:fixed;top:0.5rem;left:0.5rem;z-index:100;transform:translateY(-150%);border-radius:0.5rem;background:var(--text);color:#fff;padding:0.75rem 1rem}.skip-link:focus{transform:translateY(0)}.site-header{position:sticky;top:0;z-index:20;border-bottom:1px solid rgba(215,228,224,0.9);background:rgba(247,250,249,0.94);backdrop-filter:blur(0.75rem)}.site-header__inner,.site-footer__inner,.page-shell{width:calc(100% - 2rem);max-width:var(--content-width);margin-inline:auto}.site-header__inner{display:grid;grid-template-columns:1fr auto;align-items:center;gap:0.5rem 1rem;min-height:4.5rem}.brand{display:inline-flex;min-width:0;align-items:center;gap:0.75rem;color:var(--text);text-decoration:none}.brand__mark{display:grid;width:2.75rem;height:2.75rem;flex:0 0 auto;place-items:center;border-radius:0.8rem;background:var(--primary);color:#fff;font-weight:800;letter-spacing:-0.04em}.brand__text{display:none;line-height:1.2}.brand__text strong,.brand__text small{display:block}.brand__text small{margin-top:0.2rem;color:var(--muted);font-size:0.78rem}.site-nav{display:flex;grid-column:1 / -1;grid-row:2;gap:0.25rem;overflow-x:auto;padding-bottom:0.5rem;scrollbar-width:none}.site-nav::-webkit-scrollbar{display:none}.site-nav a,.language-option{display:inline-flex;min-height:2.75rem;align-items:center;justify-content:center;border-radius:0.65rem;white-space:nowrap;font-weight:700;text-decoration:none}.site-nav a{padding-inline:0.8rem;color:var(--muted)}.site-nav a:hover,.site-nav a:focus-visible{background:var(--surface-muted);color:var(--primary-dark)}.language-switcher{display:inline-flex;justify-self:end;border:1px solid var(--border);border-radius:0.75rem;background:var(--surface);padding:0.15rem}.language-option{min-width:2.75rem;border:0;background:transparent;color:var(--muted);cursor:pointer;font:inherit;font-size:0.875rem}.language-option[aria-pressed="true"]{background:var(--primary);color:#fff}.page-shell{min-height:70vh;padding-block:2.5rem 4rem}.hero{display:grid;gap:2rem;align-items:center;padding-block:2rem 3rem}.eyebrow{margin:0 0 0.75rem;color:var(--primary);font-size:0.82rem;font-weight:800;letter-spacing:0.12em;text-transform:uppercase}h1,h2,h3{color:var(--text);line-height:1.2;text-wrap:balance}h1{margin:0 0 1rem;font-size:clamp(2.25rem, 7vw, 4.75rem);letter-spacing:-0.055em}h2{margin-top:2.75rem;font-size:clamp(1.65rem, 5vw, 2.35rem);letter-spacing:-0.035em}h3{margin-top:1.75rem;font-size:1.25rem}.hero__lead{max-width:58ch;margin:0;color:var(--muted);font-size:clamp(1.08rem, 3vw, 1.3rem)}.hero__panel{border:1px solid var(--border);border-radius:var(--radius);background:linear-gradient(145deg, var(--primary-dark), var(--primary));box-shadow:var(--shadow);color:#fff;padding:1.5rem}.hero__panel p,.hero__panel strong{color:inherit}.hero__panel p{margin:0;opacity:0.82}.hero__panel strong{display:block;margin-top:0.35rem;font-size:1.3rem}.action-row{display:flex;flex-wrap:wrap;gap:0.75rem;margin-top:1.5rem}.button{display:inline-flex;min-height:2.9rem;align-items:center;justify-content:center;border:1px solid var(--primary);border-radius:0.75rem;background:var(--primary);color:#fff;padding:0.65rem 1rem;font-weight:750;text-decoration:none}.button:hover{background:var(--primary-dark);color:#fff}.button--secondary{background:transparent;color:var(--primary)}.section-heading{display:flex;flex-wrap:wrap;align-items:end;justify-content:space-between;gap:0.5rem 1rem;margin-bottom:1.25rem}.section-heading h2{margin-bottom:0}.section-heading p{max-width:58ch;margin:0;color:var(--muted)}.card-grid{display:grid;grid-template-columns:1fr;gap:1rem}.card{display:flex;min-width:0;flex-direction:column;border:1px solid var(--border);border-radius:var(--radius);background:var(--surface);box-shadow:0 0.5rem 1.5rem rgba(13,49,42,0.045);padding:1.35rem}.card h2,.card h3{margin:0.6rem 0;font-size:1.25rem;letter-spacing:-0.02em}.card p{margin-top:0;color:var(--muted)}.card__link{margin-top:auto;font-weight:750}.topic-index{display:flex;flex-wrap:wrap;gap:0.5rem;margin:0 0 3rem;padding:0;list-style:none}.topic-index a{display:inline-flex;min-height:2.75rem;align-items:center;border:1px solid var(--border);border-radius:999px;background:var(--surface);padding:0.5rem 0.85rem;font-weight:700;text-decoration:none}.topic-index a:hover,.topic-index a:focus-visible{border-color:var(--primary);background:var(--surface-muted)}.writing-topic{scroll-margin-top:6rem;margin-top:3.5rem}.writing-topic+.writing-topic{border-top:1px solid var(--border);padding-top:3rem}.writing-topic__heading{margin-bottom:1.25rem}.writing-topic__heading h2{margin:0 0 0.4rem}.writing-topic__heading p{max-width:62ch;margin:0;color:var(--muted)}.article-card__meta{display:flex;flex-wrap:wrap;gap:0.4rem 0.8rem;margin-bottom:0.2rem;color:var(--muted);font-size:0.875rem}.article-card>[data-lang]{display:flex;flex:1;flex-direction:column}.badge-list{display:flex;flex-wrap:wrap;gap:0.45rem;margin:0;padding:0;list-style:none}.badge{border-radius:999px;background:var(--surface-muted);color:var(--primary-dark);padding:0.25rem 0.65rem;font-size:0.82rem;font-weight:750}.reading-page{min-width:0;max-width:var(--reading-width);overflow-x:clip;margin-inline:auto}.original-source{margin-bottom:4rem;border-bottom:1px solid var(--border);padding-bottom:3rem}.original-source__note{margin-top:0}.original-archive{margin-bottom:2.5rem;border:1px solid var(--border);border-radius:var(--radius);background:var(--surface);padding:1rem 1.15rem}.original-archive summary{min-height:2.75rem;color:var(--primary);font-weight:750;cursor:pointer}.original-archive>div{padding-top:1rem}.page-intro{margin-bottom:2rem;border-bottom:1px solid var(--border);padding-bottom:1.5rem}.page-intro h1{font-size:clamp(2.1rem, 8vw, 3.6rem)}.page-intro p{color:var(--muted);font-size:1.12rem}.meta-row{display:flex;flex-wrap:wrap;gap:0.5rem 1rem;color:var(--muted);font-size:0.9rem}.callout{margin-block:1.5rem;border-left:0.3rem solid var(--accent);border-radius:0 0.75rem 0.75rem 0;background:#fff8e8;padding:1rem 1.1rem}.callout p:first-child,.callout p:last-child{margin-block:0}.process{counter-reset:process;display:grid;gap:0.85rem;margin:1.5rem 0;padding:0;list-style:none}.process li{counter-increment:process;position:relative;border:1px solid var(--border);border-radius:0.75rem;background:var(--surface);padding:1rem 1rem 1rem 3.5rem}.process li::before{content:counter(process);position:absolute;top:0.9rem;left:1rem;display:grid;width:1.8rem;height:1.8rem;place-items:center;border-radius:50%;background:var(--primary);color:#fff;font-weight:800}pre{max-width:100%;overflow-x:auto;border-radius:0.75rem;background:var(--code);color:#dff7ef;padding:1rem;font-size:0.9rem;line-height:1.55}code{border-radius:0.3rem;background:#e7f1ee;padding:0.1em 0.35em;font-family:"SFMono-Regular", Consolas, "Liberation Mono", monospace;font-size:0.92em}pre code{background:transparent;padding:0}.table-wrap,table{width:100%}.table-wrap{overflow-x:auto}table{max-width:100%;border-collapse:collapse;table-layout:fixed}th,td{border-bottom:1px solid var(--border);padding:0.75rem;overflow-wrap:anywhere;text-align:left;vertical-align:top}blockquote{margin-inline:0;border-left:0.25rem solid var(--primary);color:var(--muted);padding-left:1rem}.site-footer{border-top:1px solid var(--border);background:var(--surface);padding-block:2.5rem}.site-footer__inner{display:grid;gap:1.25rem}.site-footer p{max-width:60ch;margin:0.35rem 0 0;color:var(--muted)}.site-footer__links{display:flex;flex-wrap:wrap;gap:0.75rem}.site-footer__links a{display:inline-flex;min-height:2.75rem;align-items:center;font-weight:750}.site-footer__note{width:calc(100% - 2rem);max-width:var(--content-width);margin:1.5rem auto 0 !important;font-size:0.875rem}@media (min-width: 40rem){.brand__text{display:block}.card-grid--two{grid-template-columns:repeat(2, minmax(0, 1fr))}.site-footer__inner{grid-template-columns:1fr auto;align-items:start}}@media (min-width: 48rem){.site-header__inner{display:flex;min-height:5rem}.site-nav{grid-column:auto;grid-row:auto;margin-left:auto;overflow:visible;padding-bottom:0}.card-grid--three{grid-template-columns:repeat(3, minmax(0, 1fr))}.process{grid-template-columns:repeat(2, minmax(0, 1fr))}}@media (min-width: 64rem){.page-shell{padding-block:4rem 6rem}.hero{grid-template-columns:minmax(0, 1.65fr) minmax(15rem, 0.75fr);min-height:32rem;padding-block:4rem}}@media (prefers-reduced-motion: reduce){html{scroll-behavior:auto}*,*::before,*::after{transition-duration:0.01ms !important;animation-duration:0.01ms !important;animation-iteration-count:1 !important}}