/* The blog (owner, 2026-10-10): modern, a soft AI look, content in white cards with a shadow
   so the article doesn't run edge to edge. Uses the app's colours (styles.css) in both themes. */
.bl-page{--bl-card:var(--sheet);--bl-line:color-mix(in srgb,var(--line) 80%,transparent);
  --bl-a:#5b7cff;--bl-b:#a879ff;--bl-c:#38d6c4;--bl-soft:color-mix(in srgb,var(--bl-b) 9%,var(--sheet));
  --bl-shadow:0 1px 2px rgb(16 24 40 / .04),0 10px 30px -10px rgb(40 52 120 / .18);
  background:linear-gradient(180deg,color-mix(in srgb,var(--bl-a) 7%,var(--paper)) 0,var(--paper) 520px)}
:root[data-theme="dark"] .bl-page{--bl-shadow:0 1px 2px rgb(0 0 0 / .4),0 14px 34px -10px rgb(0 0 0 / .7)}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]) .bl-page{--bl-shadow:0 1px 2px rgb(0 0 0 / .4),0 14px 34px -10px rgb(0 0 0 / .7)}}
.bl-glow{position:absolute;inset:0 0 auto 0;height:560px;pointer-events:none;overflow:hidden;z-index:0;
  background:radial-gradient(520px 260px at 82% 18%,color-mix(in srgb,var(--bl-b) 22%,transparent),transparent 70%),
             radial-gradient(420px 220px at 12% 8%,color-mix(in srgb,var(--bl-a) 16%,transparent),transparent 70%)}
.bl-page main{position:relative;z-index:1;padding-bottom:40px}
.bl-wrap{max-width:1200px}
.bl-top{background:color-mix(in srgb,var(--paper) 75%,transparent);backdrop-filter:blur(10px);position:sticky;top:0;z-index:20}
.bl-nav{display:none;gap:4px;margin-left:22px;margin-right:auto}
.bl-nav a{color:var(--ink-2);text-decoration:none;font-weight:600;font-size:.92rem;padding:8px 12px;border-radius:999px}
.bl-nav a:hover{background:var(--tint);color:var(--ink)}
@media (min-width:760px){.bl-nav{display:flex}}
.bl-me{display:inline-flex;align-items:center;gap:8px;padding-left:4px}
.bl-me .avatar{width:24px;height:24px;font-size:.75rem}
.bl-crumbs{font-size:.85rem;color:var(--ink-2);margin:18px 0 8px;display:flex;flex-wrap:wrap;gap:6px;align-items:center}
.bl-crumbs a{color:var(--ink-2)}
.bl-crumbs span:last-child{color:var(--ink-3);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:60ch}

/* hero */
.bl-hero{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(0,.75fr);gap:24px;align-items:center;padding:10px 0 22px}
.bl-eyebrow{display:inline-flex;align-items:center;gap:7px;font-size:.72rem;font-weight:800;letter-spacing:.14em;text-transform:uppercase;
  color:var(--accent);background:color-mix(in srgb,var(--bl-b) 12%,var(--sheet));border:1px solid color-mix(in srgb,var(--bl-b) 25%,transparent);
  padding:6px 12px;border-radius:999px}
.bl-hero h1{font:800 clamp(2.1rem,5.2vw,3.6rem)/1.05 var(--font-display);letter-spacing:-.03em;margin:16px 0 12px}
.bl-art-hero h1{font-size:clamp(1.8rem,4.2vw,2.8rem);line-height:1.12;letter-spacing:-.02em}
.bl-grad{background:linear-gradient(100deg,var(--bl-a),var(--bl-b));-webkit-background-clip:text;background-clip:text;color:transparent}
.bl-lede{font-size:1.08rem;color:var(--ink-2);max-width:58ch}
.bl-ameta{color:var(--ink-3);font-size:.92rem;margin-bottom:12px}
.bl-art-hero{grid-template-columns:1fr;max-width:900px}

/* the hero picture: a voice orb, a wave, three floating notes */
.bl-art{position:relative;height:250px}
.bl-orb{position:absolute;left:50%;top:50%;width:150px;height:150px;transform:translate(-50%,-50%);border-radius:50%;display:grid;place-items:center;align-content:center;gap:10px;color:#fff;
  background:radial-gradient(circle at 30% 25%,#fff6 0,transparent 35%),linear-gradient(140deg,var(--bl-a),var(--bl-b) 60%,var(--bl-c));
  box-shadow:0 20px 50px -12px color-mix(in srgb,var(--bl-b) 60%,transparent),0 0 0 14px color-mix(in srgb,var(--bl-b) 10%,transparent),0 0 0 30px color-mix(in srgb,var(--bl-a) 6%,transparent);
  animation:blFloat 6s ease-in-out infinite}
.bl-wave{display:flex;gap:4px;align-items:center;height:22px}
.bl-wave i{width:4px;border-radius:4px;background:#fff;height:calc(22px * var(--h));animation:blWave 1.2s ease-in-out infinite;animation-delay:var(--d)}
.bl-note{position:absolute;display:inline-flex;align-items:center;gap:7px;font-size:.84rem;font-weight:700;color:var(--ink);padding:9px 13px;border-radius:14px;
  background:var(--sheet);border:1px solid var(--bl-line);box-shadow:var(--bl-shadow);white-space:nowrap}
.bl-note svg{color:var(--bl-b)}
.bl-note.n1{left:0;top:22px;animation:blFloat 7s ease-in-out infinite}
.bl-note.n2{right:0;top:70px;animation:blFloat 8s ease-in-out .8s infinite}
.bl-note.n3{left:12%;bottom:6px;animation:blFloat 7.5s ease-in-out .4s infinite}
@keyframes blFloat{50%{transform:translateY(-8px)}}
.bl-orb{animation-name:blOrb}
@keyframes blOrb{50%{transform:translate(-50%,calc(-50% - 8px))}}
@keyframes blWave{50%{transform:scaleY(.45)}}
@media (prefers-reduced-motion:reduce){.bl-orb,.bl-note,.bl-wave i{animation:none}}
@media (max-width:820px){.bl-hero{grid-template-columns:1fr}.bl-art{display:none}}

/* search + topics */
.bl-tools{display:flex;flex-wrap:wrap;gap:12px;align-items:center;margin:6px 0 18px}
.bl-search{flex:1 1 320px;display:flex;align-items:center;gap:10px;padding:0 14px;height:48px;border-radius:14px;background:var(--bl-card);border:1px solid var(--bl-line);box-shadow:var(--bl-shadow);color:var(--ink-3)}
.bl-search:focus-within{border-color:var(--accent);outline:2px solid color-mix(in srgb,var(--accent) 25%,transparent)}
.bl-search input{flex:1;min-width:0;border:0;background:transparent;font-size:.98rem;color:var(--ink);outline:none;padding:0}
.bl-search kbd{font:600 .75rem var(--font-mono);border:1px solid var(--line);border-radius:6px;padding:2px 7px;color:var(--ink-3)}
.bl-chips{display:flex;gap:8px;overflow-x:auto;padding:4px 2px;scrollbar-width:none;max-width:100%}
.bl-chips::-webkit-scrollbar{display:none}
.bl-chips button{flex:none;border:1px solid var(--bl-line);background:var(--bl-card);color:var(--ink-2);font-weight:600;font-size:.88rem;padding:9px 14px;border-radius:999px;cursor:pointer;box-shadow:var(--shadow-sm)}
.bl-chips button small{color:var(--ink-3);font-weight:600;margin-left:2px}
.bl-chips button:hover{color:var(--ink);border-color:color-mix(in srgb,var(--accent) 40%,var(--line))}
.bl-chips button[aria-pressed="true"]{background:linear-gradient(100deg,var(--bl-a),var(--bl-b));color:#fff;border-color:transparent}
.bl-chips button[aria-pressed="true"] small{color:#ffffffb0}

/* the list */
.bl-grid{list-style:none;margin:0;padding:0;display:grid;gap:16px;grid-template-columns:repeat(auto-fill,minmax(min(100%,460px),1fr))}
.bl-grid.three{grid-template-columns:repeat(auto-fill,minmax(min(100%,340px),1fr))}
.bl-grid li[hidden]{display:none}
.bl-card{position:relative;display:grid;grid-template-columns:150px minmax(0,1fr);gap:18px;padding:16px;border-radius:20px;background:var(--bl-card);border:1px solid var(--bl-line);
  box-shadow:var(--bl-shadow);color:var(--ink);text-decoration:none;height:100%;transition:transform .2s,box-shadow .2s,border-color .2s}
.bl-card:hover{transform:translateY(-3px);border-color:color-mix(in srgb,var(--accent) 35%,var(--line));box-shadow:0 18px 40px -14px color-mix(in srgb,var(--bl-b) 45%,transparent)}
.bl-grid:not(.filtered) li.feat{grid-column:1/-1}
.bl-grid:not(.filtered) li.feat .bl-card{grid-template-columns:260px minmax(0,1fr)}
.bl-grid:not(.filtered) li.feat .bl-thumb{min-height:190px}
.bl-grid:not(.filtered) li.feat b{font-size:1.4rem}
.bl-thumb{position:relative;border-radius:14px;display:grid;place-items:center;min-height:140px;overflow:hidden;color:var(--t1,#5b7cff);
  background:radial-gradient(circle at 28% 18%,#ffffffcc 0,transparent 45%),linear-gradient(140deg,color-mix(in srgb,var(--t1,#5b7cff) 26%,var(--sheet)),color-mix(in srgb,var(--t2,#a879ff) 34%,var(--sheet)))}
.bl-thumb::after{content:"";position:absolute;width:120px;height:120px;border-radius:50%;right:-30px;bottom:-40px;background:color-mix(in srgb,var(--t2,#a879ff) 30%,transparent);filter:blur(4px)}
.bl-thumb svg{position:relative;z-index:1;width:54px;height:54px}
.bl-grid:not(.filtered) li.feat .bl-thumb svg{width:76px;height:76px}
.bl-thumb svg{filter:drop-shadow(0 8px 14px color-mix(in srgb,var(--t1,#5b7cff) 35%,transparent))}
.bl-thumb small{z-index:1;position:absolute;left:10px;bottom:10px;font-size:.72rem;font-weight:700;color:var(--ink-2);background:color-mix(in srgb,var(--sheet) 85%,transparent);padding:3px 8px;border-radius:8px}
.bl-thumb.img img{width:100%;height:100%;object-fit:cover;position:absolute;inset:0}
:root[data-theme="dark"] .bl-thumb{background:linear-gradient(140deg,color-mix(in srgb,var(--t1) 22%,var(--sheet)),color-mix(in srgb,var(--t2) 26%,var(--sheet)))}
.t-java{--t1:#f08a24;--t2:#5b7cff}.t-kafka{--t1:#2b2f3a;--t2:#5b7cff}.t-hr{--t1:#3b82f6;--t2:#a879ff}.t-design{--t1:#7c5cff;--t2:#38d6c4}
.t-spring{--t1:#22a06b;--t2:#38d6c4}.t-experience{--t1:#e0457b;--t2:#a879ff}.t-rapid{--t1:#f5a623;--t2:#ff5c7a}.t-collections{--t1:#0ea5e9;--t2:#5b7cff}.t-doc{--t1:#5b7cff;--t2:#a879ff}
:root[data-theme="dark"] .t-kafka{--t1:#c9d2ea}
.bl-cbody{display:grid;gap:7px;align-content:start;min-width:0;padding-right:28px}
.bl-cbody b{font-size:1.08rem;line-height:1.3;letter-spacing:-.01em}
.bl-desc{color:var(--ink-2);font-size:.92rem;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.bl-meta{display:flex;flex-wrap:wrap;align-items:center;gap:6px;color:var(--ink-3);font-size:.8rem;margin-top:2px}
.bl-meta i{font-style:normal}
.bl-go{position:absolute;right:14px;top:14px;width:34px;height:34px;border-radius:50%;display:grid;place-items:center;border:1px solid var(--bl-line);color:var(--ink-2);background:var(--bl-card);transition:background .2s,color .2s}
.bl-card:hover .bl-go{background:var(--accent);color:var(--accent-ink);border-color:transparent}
.bl-pills{display:flex;flex-wrap:wrap;gap:6px}
.bl-pills span,.bl-pill{font-size:.74rem;font-weight:700;padding:4px 10px;border-radius:999px;background:color-mix(in srgb,var(--bl-b) 12%,var(--sheet));color:color-mix(in srgb,var(--bl-b) 70%,var(--ink));text-decoration:none}
.bl-pills span:first-child{background:var(--accent-soft);color:var(--accent)}
.bl-pills.big .bl-pill{font-size:.82rem;padding:6px 12px}
.bl-pill:hover{background:var(--accent-soft);color:var(--accent)}
.bl-empty{margin:20px 0;color:var(--ink-2);text-align:center}
@media (max-width:560px){
  .bl-card,.bl-grid:not(.filtered) li.feat .bl-card{grid-template-columns:1fr}
  .bl-thumb,.bl-grid:not(.filtered) li.feat .bl-thumb{min-height:120px}
}

/* the call to practise */
.bl-band{display:grid;grid-template-columns:minmax(0,1.3fr) auto auto;gap:24px;align-items:center;margin:34px 0 10px;padding:26px 28px;border-radius:24px;
  background:linear-gradient(120deg,color-mix(in srgb,var(--bl-a) 10%,var(--sheet)),color-mix(in srgb,var(--bl-b) 14%,var(--sheet)));border:1px solid color-mix(in srgb,var(--bl-b) 22%,var(--line));box-shadow:var(--bl-shadow)}
.bl-band h2{font:800 clamp(1.5rem,3vw,2rem)/1.15 var(--font-display);margin:12px 0 6px;letter-spacing:-.02em}
.bl-band h2 em{font-style:italic;background:linear-gradient(100deg,var(--bl-a),var(--bl-b));-webkit-background-clip:text;background-clip:text;color:transparent;padding-right:4px}
.bl-band p{color:var(--ink-2);max-width:54ch}
.bl-checks{list-style:none;margin:0;padding:0;display:grid;gap:8px;font-size:.9rem;color:var(--ink-2)}
.bl-checks li{display:flex;gap:8px;align-items:center}
.bl-checks svg{color:var(--good);flex:none}
.bl-band-go{display:grid;gap:8px;justify-items:center}
.bl-band-go small,.bl-side-cta small{color:var(--ink-3);font-size:.78rem}
.bl-cta-btn{white-space:nowrap}
@media (max-width:900px){.bl-band{grid-template-columns:1fr}.bl-band-go{justify-items:start}}

/* an article: the text in a card with a shadow, a sidebar beside it */
.bl-draft{margin:6px 0 4px;padding:12px 16px;border-radius:12px;background:var(--warn-soft);color:var(--warn);font-weight:600}
.bl-layout{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:24px;align-items:start;margin-top:6px}
.bl-article{background:var(--bl-card);border:1px solid var(--bl-line);border-radius:24px;box-shadow:var(--bl-shadow);padding:clamp(20px,4vw,44px);min-width:0}
.bl-soon{text-align:center;color:var(--ink-2)}
.bl-cover{width:100%;border-radius:16px;margin-bottom:18px}
.bl-article .blog-body{margin-top:0;font-size:1.04rem}
.bl-article .blog-body>p:first-child{font-size:1.12rem;color:var(--ink)}
.bl-article .blog-body h2{display:flex;gap:12px;align-items:center;font-size:1.4rem;margin-top:2em;padding-top:4px;scroll-margin-top:90px}
.bl-article .blog-body h3{scroll-margin-top:90px}
.bl-num{flex:none;width:34px;height:34px;border-radius:50%;display:grid;place-items:center;font:800 .95rem var(--font-display);color:#fff;
  background:linear-gradient(140deg,var(--bl-a),var(--bl-b));box-shadow:0 6px 14px -4px color-mix(in srgb,var(--bl-b) 60%,transparent)}
.bl-article .blog-body pre{position:relative;padding:44px 18px 18px;border-radius:16px;background:#0f1626;box-shadow:inset 0 0 0 1px #ffffff12}
.bl-article .blog-body pre::before{content:"";position:absolute;left:16px;top:16px;width:10px;height:10px;border-radius:50%;background:#ff5f57;box-shadow:16px 0 #febc2e,32px 0 #28c840}
.bl-copy{position:absolute;right:10px;top:9px;border:1px solid #ffffff26;background:#ffffff12;color:#e6ebf5;font:600 .76rem var(--font-body);padding:4px 10px;border-radius:8px;cursor:pointer}
.bl-copy:hover{background:#ffffff24}
.bl-article .blog-body table{display:table;width:100%;border-radius:14px;overflow:hidden;border:1px solid var(--line);border-collapse:separate;border-spacing:0}
.bl-article .blog-body th,.bl-article .blog-body td{border:0;border-bottom:1px solid var(--line);border-right:1px solid var(--line)}
.bl-article .blog-body tr>*:last-child{border-right:0}
.bl-article .blog-body tbody tr:last-child>*{border-bottom:0}
.bl-article .blog-body th{background:color-mix(in srgb,var(--bl-a) 8%,var(--sheet))}
@media (max-width:640px){.bl-article .blog-body table{display:block;overflow-x:auto}}
.bl-article .blog-body ol,.bl-article .blog-body ul{padding-left:1.3em}
.bl-article .blog-body ol li::marker{color:var(--accent);font-weight:700}
.bl-article .blog-cta{border-radius:18px;padding:20px 22px;background:linear-gradient(120deg,color-mix(in srgb,var(--bl-a) 10%,var(--sheet)),color-mix(in srgb,var(--bl-b) 14%,var(--sheet)));
  border:1px solid color-mix(in srgb,var(--bl-b) 22%,var(--line))}
.bl-article .blog-cta a{display:inline-flex;margin-top:4px;padding:9px 16px;border-radius:999px;color:#fff;text-decoration:none;background:linear-gradient(100deg,var(--bl-a),var(--bl-b))}
.bl-side{display:grid;gap:16px;position:sticky;top:84px}
.bl-box{display:grid;gap:10px;background:var(--bl-card);border:1px solid var(--bl-line);border-radius:20px;box-shadow:var(--bl-shadow);padding:18px;color:var(--ink);text-decoration:none}
.bl-box>b{display:flex;gap:8px;align-items:center;font-size:.98rem}
.bl-box>b svg{color:var(--accent)}
.bl-toc ol{list-style:none;margin:0;padding:0 0 0 8px;display:grid;gap:2px;border-left:2px solid var(--line);max-height:46vh;overflow:auto}
.bl-toc a{display:block;padding:5px 10px;margin-left:-10px;border-left:2px solid transparent;color:var(--ink-2);text-decoration:none;font-size:.86rem;line-height:1.35}
.bl-toc a:hover{color:var(--ink)}
.bl-toc a.on{color:var(--accent);border-left-color:var(--accent);font-weight:600}
.bl-side-cta{background:linear-gradient(150deg,color-mix(in srgb,var(--bl-a) 9%,var(--sheet)),color-mix(in srgb,var(--bl-b) 13%,var(--sheet)))}
.bl-side-cta p{color:var(--ink-2);font-size:.88rem}
.bl-side-cta .cta{width:100%;justify-content:center}
.bl-side-cta small{text-align:center}
.bl-more-link{grid-template-columns:1fr auto;align-items:center}
.bl-more-link span{grid-column:1;color:var(--ink-2);font-size:.86rem}
.bl-more-link svg{grid-column:2;grid-row:1/3;color:var(--ink-2)}
.bl-more-link:hover{border-color:color-mix(in srgb,var(--accent) 40%,var(--line))}
.bl-more{margin-top:34px}
.bl-more h2{font-size:1.3rem;margin-bottom:14px}
@media (max-width:980px){.bl-layout{grid-template-columns:1fr}.bl-side{position:static}.bl-toc{display:none}}
.bl-foot{position:relative;z-index:1}

/* the interview question bank in the same design (owner, 2026-10-10) */
.bl-thumb.co{min-height:0;width:64px;height:64px;border-radius:18px;font:800 1.7rem var(--font-display);color:#fff;
  background:linear-gradient(140deg,hsl(var(--h) 75% 58%),hsl(calc(var(--h) + 40) 70% 50%));box-shadow:0 10px 22px -8px hsl(var(--h) 70% 45% / .6)}
.bl-thumb.co::after{display:none}
.bl-thumb.co.big{width:72px;height:72px;font-size:2rem;margin-bottom:14px}
.co-grid{grid-template-columns:repeat(auto-fill,minmax(min(100%,330px),1fr))}
.co-card{grid-template-columns:64px minmax(0,1fr);align-items:center;padding:16px 18px}
.co-card .bl-cbody{gap:8px}
.co-card .bl-cbody b{font-size:1rem}
@media (max-width:560px){.co-card{grid-template-columns:56px minmax(0,1fr)}.co-card .bl-thumb.co{width:56px;height:56px}}
.bq-article{padding:clamp(18px,3.4vw,36px)}
.bq-round+.bq-round{margin-top:30px}
.bq-round h2{display:flex;gap:12px;align-items:center;font-size:1.3rem;margin:0 0 14px;scroll-margin-top:90px}
.bq-round h2 small{font:600 .8rem var(--font-mono);color:var(--ink-3);background:var(--tint);padding:3px 9px;border-radius:999px}
.bq-list{list-style:none;margin:0;padding:0;display:grid;gap:10px;counter-reset:q}
.bq-list>li{counter-increment:q;position:relative;padding:14px 16px 12px 54px;border-radius:16px;border:1px solid var(--bl-line);
  background:color-mix(in srgb,var(--bl-a) 3%,var(--sheet));transition:border-color .2s,box-shadow .2s}
.bq-list>li:hover{border-color:color-mix(in srgb,var(--accent) 35%,var(--line));box-shadow:var(--shadow-sm)}
.bq-list>li::before{content:counter(q);position:absolute;left:14px;top:13px;width:28px;height:28px;border-radius:9px;background:var(--accent-soft);color:var(--accent);font:700 .82rem var(--font-mono);display:grid;place-items:center}
.bq-list>li>p{font-weight:650;line-height:1.45;overflow-wrap:anywhere;font-size:1rem}
.bq-list>li>small{display:flex;flex-wrap:wrap;gap:8px;margin-top:4px;color:var(--ink-3);font-size:.8rem}
.bq-again{color:var(--warn);font-weight:700}
.bq-list .bank-ans{margin-top:10px}
.bl-toc small{color:var(--ink-3)}
.bq-hero>div{display:grid;grid-template-columns:auto minmax(0,1fr);column-gap:18px;align-items:center}
.bq-hero .bl-thumb.co.big{grid-row:1/3;margin:0}
.bq-hero .bl-eyebrow{justify-self:start;align-self:end}
.bq-hero h1{margin:8px 0 0}
.bq-hero .bl-lede,.bq-hero .bl-pills{grid-column:1/-1;margin-top:12px}