/* Field Notes (blog) — listing + article. Tokens live in home.css. */

/* ---- listing hero -------------------------------------------------------- */
.fn-hero { position: relative; overflow: hidden; background: var(--background); }
.fn-hero-blob { position: absolute; top: -220px; right: -120px; width: 620px; height: 620px; border-radius: 50%; background: var(--gradient-soft); filter: blur(20px); pointer-events: none; }
.fn-hero-inner { position: relative; max-width: 1240px; margin: 0 auto; padding: 164px 40px 56px; display: flex; flex-direction: column; gap: 22px; }
.fn-badge { display: inline-flex; align-self: flex-start; align-items: center; gap: 10px; background: var(--glass); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); border-radius: var(--radius-full); padding: 9px 18px; font-weight: 700; font-size: 12px; letter-spacing: .16em; text-transform: uppercase; color: var(--on-surface-variant); box-shadow: var(--shadow-ambient); }
.fn-hero h1 { font-weight: 800; font-size: clamp(42px, 6vw, 72px); line-height: .98; letter-spacing: -.045em; max-width: 900px; }
.fn-lede { font-size: 19px; line-height: 1.6; color: var(--on-surface-variant); max-width: 620px; text-wrap: pretty; }

.dot { width: 7px; height: 7px; border-radius: 50%; flex: none; background: var(--secondary); }
.fn-kicker { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 11px; letter-spacing: .18em; text-transform: uppercase; color: var(--secondary); }
.fn-kicker .sep, .fn-kicker .dim { color: var(--on-surface-faint); }

/* ---- featured essay ------------------------------------------------------ */
.fn-featured-wrap { max-width: 1240px; margin: 0 auto; padding: 0 40px 64px; }
.fn-featured { display: grid; grid-template-columns: 1.05fr 1fr; background: var(--surface-container-lowest); border-radius: var(--radius-xl); overflow: hidden; box-shadow: var(--shadow-card); color: inherit; transition: transform var(--dur) var(--ease-out), box-shadow var(--dur) var(--ease-out); }
.fn-featured:hover { transform: translateY(-4px); box-shadow: var(--shadow-float); color: inherit; }
.fn-featured-media { position: relative; min-height: 420px; overflow: hidden; background: var(--gradient-brand); }
.fn-featured-media img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.fn-featured-media::after { content: ""; position: absolute; inset: 0; background: linear-gradient(135deg, rgba(99,67,212,.28), rgba(0,102,139,.22)); }
.fn-flag { position: absolute; left: 28px; bottom: 28px; z-index: 1; display: inline-flex; align-items: center; gap: 9px; background: var(--glass); backdrop-filter: blur(var(--glass-blur)); -webkit-backdrop-filter: blur(var(--glass-blur)); border-radius: var(--radius-full); padding: 10px 18px; font-weight: 700; font-size: 11px; letter-spacing: .16em; text-transform: uppercase; color: var(--on-surface-strong); }
.fn-featured-body { padding: 52px 52px 44px; display: flex; flex-direction: column; gap: 18px; justify-content: center; }
.fn-featured-body h2 { font-weight: 800; font-size: clamp(30px, 3vw, 42px); line-height: 1.06; letter-spacing: -.04em; text-wrap: pretty; }
.fn-featured-body > p { font-size: 17px; line-height: 1.65; color: var(--on-surface-variant); text-wrap: pretty; }
.fn-byline { display: flex; align-items: center; gap: 14px; margin-top: 10px; }
.fn-avatar { width: 40px; height: 40px; border-radius: 50%; background: var(--gradient-brand); display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 14px; color: #fff; flex: none; }
.fn-byline-meta { display: flex; flex-direction: column; gap: 2px; }
.fn-byline-meta b { font-weight: 700; font-size: 14px; color: var(--on-surface-strong); }
.fn-byline-meta span { font-size: 13px; color: var(--on-surface-faint); }
.fn-readlink { margin-left: auto; display: inline-flex; align-items: center; gap: 8px; font-weight: 700; font-size: 15px; color: var(--primary); }
.fn-readlink .material-symbols-rounded { font-size: 19px; }

/* ---- band: filters + grid ------------------------------------------------ */
.fn-band { background: var(--surface-container); padding: 56px 0 88px; }
.fn-band-inner { max-width: 1240px; margin: 0 auto; padding: 0 40px; display: flex; flex-direction: column; gap: 32px; }
.fn-toolbar { display: flex; align-items: center; justify-content: space-between; gap: 32px; flex-wrap: wrap; }
.fn-pills { display: flex; flex-wrap: wrap; gap: 10px; }
.fn-pill { cursor: pointer; border: 0; border-radius: var(--radius-full); padding: 11px 20px; font-family: var(--font-body); font-weight: 700; font-size: 14px; background: var(--surface-container-lowest); color: var(--on-surface-variant); box-shadow: var(--shadow-ambient); transition: transform var(--dur-fast) var(--ease-out); }
.fn-pill:hover { transform: translateY(-1px); }
.fn-pill.is-active { background: var(--surface-dark); color: #fff; }
.fn-search { display: flex; align-items: center; gap: 10px; background: var(--surface-container-lowest); border-radius: var(--radius-full); padding: 12px 22px; box-shadow: var(--shadow-ambient); min-width: 280px; }
.fn-search .material-symbols-rounded { font-size: 20px; color: var(--on-surface-faint); }
.fn-search input { border: none; background: transparent; font-family: inherit; font-size: 15px; color: var(--on-surface-strong); width: 100%; }
.fn-search input:focus { outline: none; }

.fn-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.fn-card { display: flex; flex-direction: column; gap: 14px; background: var(--surface-container-lowest); border-radius: var(--radius-lg); padding: 32px 30px 26px; box-shadow: var(--shadow-ambient); color: inherit; transition: transform var(--dur) var(--ease-out), box-shadow var(--dur) var(--ease-out); }
.fn-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-card); color: inherit; }
.fn-card h3 { font-weight: 700; font-size: 23px; line-height: 1.18; letter-spacing: -.03em; text-wrap: pretty; }
.fn-card p { font-size: 15px; line-height: 1.6; color: var(--on-surface-variant); text-wrap: pretty; }
.fn-meta { margin-top: auto; padding-top: 14px; display: flex; align-items: center; gap: 10px; font-size: 12.5px; color: var(--on-surface-faint); }

.fn-empty { background: var(--surface-container-lowest); border-radius: var(--radius-lg); padding: 64px 32px; text-align: center; box-shadow: var(--shadow-ambient); display: flex; flex-direction: column; gap: 10px; align-items: center; }
.fn-empty .material-symbols-rounded { font-size: 38px; color: var(--on-surface-faint); }
.fn-empty h3 { font-weight: 700; font-size: 24px; letter-spacing: -.03em; }
.fn-empty p { font-size: 15px; color: var(--on-surface-variant); }

/* ---- newsletter: The Build Brief ----------------------------------------- */
.brief-wrap { background: var(--surface-container); padding: 0 40px 88px; }
.brief { position: relative; overflow: hidden; max-width: 1240px; margin: 0 auto; background: var(--surface-dark); border-radius: var(--radius-xl); padding: 76px 64px; display: grid; grid-template-columns: 1.15fr 1fr; gap: 56px; align-items: center; box-shadow: var(--shadow-float); }
.brief::before { content: ""; position: absolute; bottom: -260px; left: -140px; width: 520px; height: 520px; border-radius: 50%; background: radial-gradient(circle, rgba(99,67,212,.45), transparent 70%); pointer-events: none; }
.brief-copy { position: relative; display: flex; flex-direction: column; gap: 16px; }
.brief-copy .eyebrow { color: var(--secondary-sky); font-size: 12px; }
.brief-copy h2 { font-weight: 700; font-size: clamp(30px, 3.2vw, 42px); line-height: 1.08; letter-spacing: -.04em; color: var(--on-dark); text-wrap: pretty; }
.brief-copy p { font-size: 16px; line-height: 1.65; color: var(--on-dark-variant); max-width: 460px; }
.brief-form-wrap { position: relative; display: flex; flex-direction: column; gap: 14px; }
.brief-form { display: flex; gap: 10px; background: rgba(255,255,255,.08); border-radius: var(--radius-full); padding: 8px 8px 8px 24px; backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); }
.brief-form input[type="email"] { flex: 1; min-width: 0; border: none; background: transparent; font-family: inherit; font-size: 16px; color: var(--on-dark); }
.brief-form input::placeholder { color: rgba(252,247,255,.5); }
.brief-form input:focus { outline: none; }
.brief-form button { border: 0; background: #fff; color: var(--primary); border-radius: var(--radius-full); padding: 15px 28px; font-family: var(--font-body); font-weight: 700; font-size: 15px; cursor: pointer; white-space: nowrap; transition: transform var(--dur) var(--ease-out); }
.brief-form button:hover { transform: scale(1.02); }
.brief-form button:active { transform: scale(.98); }
.brief-note { font-size: 13px; color: var(--on-dark-variant); padding-left: 24px; }
.brief-done { display: none; align-items: center; gap: 10px; font-weight: 700; font-size: 16px; color: var(--on-dark); }
.brief-done .material-symbols-rounded { color: var(--secondary-sky); }
.brief-form-wrap.is-done .brief-form, .brief-form-wrap.is-done .brief-note { display: none; }
.brief-form-wrap.is-done .brief-done { display: inline-flex; }

/* ---- article ------------------------------------------------------------- */
.read-progress { position: fixed; top: 0; left: 0; right: 0; height: 3px; z-index: 40; pointer-events: none; }
.read-progress b { display: block; height: 100%; width: 0; background: var(--gradient-progress); transition: width 90ms linear; }

.article-hero { position: relative; overflow: hidden; background: var(--background); }
.article-hero-blob { position: absolute; top: -260px; left: 50%; transform: translateX(-50%); width: 900px; height: 600px; border-radius: 50%; background: var(--gradient-soft); filter: blur(24px); pointer-events: none; }
.article-hero-inner { position: relative; max-width: 840px; margin: 0 auto; padding: 156px 40px 44px; display: flex; flex-direction: column; gap: 22px; align-items: center; text-align: center; }
.crumbs { display: flex; align-items: center; gap: 12px; font-weight: 700; font-size: 11px; letter-spacing: .18em; text-transform: uppercase; color: var(--secondary); }
.crumbs a, .crumbs .sep { color: var(--on-surface-faint); }
.crumbs a:hover { color: var(--primary); }
.article-hero h1 { font-weight: 800; font-size: clamp(38px, 4.5vw, 60px); line-height: 1.02; letter-spacing: -.045em; text-wrap: pretty; }
.article-hero .fn-lede { font-size: 20px; max-width: 660px; text-align: center; }
.article-hero .fn-byline { margin-top: 8px; }
.article-hero .fn-avatar { width: 44px; height: 44px; font-size: 15px; }
.article-hero .fn-byline-meta { text-align: left; }

.article-figure { max-width: 1240px; margin: 0 auto; padding: 0 40px; }
.article-figure .frame { position: relative; border-radius: var(--radius-xl); overflow: hidden; height: 480px; box-shadow: var(--shadow-float); }
.article-figure img { width: 100%; height: 100%; object-fit: cover; display: block; }
.article-figure .frame::after { content: ""; position: absolute; inset: 0; background: linear-gradient(135deg, rgba(99,67,212,.22), rgba(0,102,139,.18)); }

.article-shell { background: var(--background); padding: 64px 40px 96px; }
.article-layout { max-width: 1240px; margin: 0 auto; display: flex; gap: 56px; align-items: flex-start; justify-content: center; }

.toc { position: sticky; top: 104px; flex: none; width: 216px; display: flex; flex-direction: column; gap: 10px; }
.toc > span { font-weight: 700; font-size: 11px; letter-spacing: .18em; text-transform: uppercase; color: var(--on-surface-faint); padding-left: 14px; }
.toc-links { display: flex; flex-direction: column; gap: 2px; }
.toc-links a { display: block; padding: 9px 14px; border-radius: var(--radius-sm); font-weight: 600; font-size: 13px; line-height: 1.4; color: var(--on-surface-muted); transition: color var(--dur-fast) var(--ease-out); }
.toc-links a:hover { color: var(--on-surface-strong); }
.toc-links a.is-active { color: var(--primary); background: var(--primary-10); }

.share-rail { position: sticky; top: 104px; flex: none; width: 56px; display: flex; flex-direction: column; gap: 10px; align-items: center; }
.share-rail > span { font-weight: 700; font-size: 10px; letter-spacing: .16em; text-transform: uppercase; color: var(--on-surface-faint); writing-mode: vertical-rl; margin-bottom: 6px; }
.share-btn { width: 44px; height: 44px; border: 0; border-radius: 50%; background: var(--surface-container-lowest); box-shadow: var(--shadow-ambient); display: flex; align-items: center; justify-content: center; cursor: pointer; transition: transform var(--dur-fast) var(--ease-out); }
.share-btn:hover { transform: translateY(-2px); }
.share-btn .material-symbols-rounded { font-size: 20px; color: var(--on-surface-variant); }

.article-body { flex: 1; min-width: 0; max-width: 720px; display: flex; flex-direction: column; gap: 40px; }
.article-body section { display: flex; flex-direction: column; gap: 18px; scroll-margin-top: 104px; }
.article-body h2 { font-weight: 700; font-size: clamp(27px, 3vw, 34px); line-height: 1.12; letter-spacing: -.035em; scroll-margin-top: 104px; }
.article-body p { font-size: 18px; line-height: 1.75; color: var(--on-surface-variant); text-wrap: pretty; }
.article-body strong { color: var(--on-surface-strong); }
.article-body ul, .article-body ol { margin: 0; padding-left: 24px; display: flex; flex-direction: column; gap: 10px; font-size: 18px; line-height: 1.7; color: var(--on-surface-variant); }
.article-body blockquote { margin: 0; position: relative; padding: 8px 0 8px 32px; }
.article-body blockquote::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 4px; border-radius: 2px; background: var(--gradient-brand); }
.article-body blockquote p { font-family: var(--font-display); font-weight: 700; font-size: 26px; line-height: 1.32; letter-spacing: -.03em; color: var(--on-surface-strong); }
.article-body figure { margin: 12px 0 0; display: flex; flex-direction: column; gap: 12px; }
.article-body figure .img-frame, .article-body figure > img { border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-card); }
.article-body figcaption { font-size: 13.5px; line-height: 1.6; color: var(--on-surface-faint); }
.article-body .callout { background: var(--primary-container); border-radius: var(--radius-lg); padding: 30px 34px; display: flex; gap: 18px; align-items: flex-start; }
.article-body .callout .material-symbols-rounded { font-size: 26px; color: var(--primary); margin-top: 2px; flex: none; }
.article-body .callout div { display: flex; flex-direction: column; gap: 7px; }
.article-body .callout .label { font-weight: 700; font-size: 11px; letter-spacing: .18em; text-transform: uppercase; color: var(--primary); }
.article-body .callout p { font-size: 17px; line-height: 1.65; color: var(--on-surface); }
.article-body .summary-card { background: var(--surface-container-lowest); border-radius: var(--radius-lg); padding: 34px 36px; box-shadow: var(--shadow-ambient); display: flex; flex-direction: column; gap: 16px; }
.article-body .summary-card ul { list-style: none; padding: 0; gap: 12px; }
.article-body .summary-card li { display: flex; gap: 14px; align-items: flex-start; font-size: 16px; line-height: 1.6; }
.article-body .summary-card li::before { content: "check_circle"; font-family: 'Material Symbols Rounded'; font-size: 20px; line-height: 1; color: var(--primary); margin-top: 3px; }
.article-body .num-list { display: flex; flex-direction: column; gap: 14px; margin-top: 4px; }
.article-body .num-item { display: flex; gap: 18px; align-items: flex-start; background: var(--surface-container-lowest); border-radius: var(--radius); padding: 22px 26px; box-shadow: var(--shadow-ambient); }
.article-body .num-item i { font-family: var(--font-display); font-style: normal; font-weight: 800; font-size: 22px; letter-spacing: -.03em; color: var(--primary); flex: none; width: 28px; }
.article-body .num-item b { display: block; font-weight: 700; font-size: 17px; color: var(--on-surface-strong); margin-bottom: 5px; }
.article-body .num-item p { font-size: 15.5px; line-height: 1.6; }

.author-card { display: flex; gap: 22px; align-items: flex-start; background: var(--surface-container-low); border-radius: var(--radius-lg); padding: 32px 34px; margin-top: 8px; }
.author-card .fn-avatar { width: 58px; height: 58px; font-size: 19px; }
.author-card .who { display: flex; flex-direction: column; gap: 7px; }
.author-card .who b { font-weight: 700; font-size: 17px; color: var(--on-surface-strong); }
.author-card .who .role { font-weight: 700; font-size: 11px; letter-spacing: .16em; text-transform: uppercase; color: var(--secondary); }
.author-card .who p { font-size: 15.5px; line-height: 1.65; color: var(--on-surface-variant); margin-top: 4px; text-wrap: pretty; }

/* ---- related + article CTA ------------------------------------------------ */
.related-band { background: var(--surface-container); padding: 80px 40px 0; }
.related-inner { max-width: 1240px; margin: 0 auto; display: flex; flex-direction: column; gap: 34px; }
.related-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 32px; flex-wrap: wrap; }
.related-head h2 { font-weight: 700; font-size: clamp(30px, 3vw, 38px); letter-spacing: -.04em; }
.related-head .all-link { font-weight: 700; font-size: 15px; color: var(--primary); display: inline-flex; align-items: center; gap: 8px; }
.related-head .all-link .material-symbols-rounded { font-size: 19px; }

.article-cta-wrap { background: var(--surface-container); padding: 80px 40px 88px; }
.article-cta { position: relative; overflow: hidden; max-width: 1240px; margin: 0 auto; border-radius: var(--radius-xl); background: var(--gradient-brand); box-shadow: var(--shadow-float); padding: 80px 40px; text-align: center; display: flex; flex-direction: column; align-items: center; gap: 22px; }
.article-cta h2 { font-weight: 700; font-size: clamp(32px, 4vw, 48px); line-height: 1.06; letter-spacing: -.045em; color: #fff; max-width: 720px; text-wrap: pretty; }
.article-cta > p { color: var(--on-dark-variant); font-size: 15px; }

/* ---- responsive ------------------------------------------------------------ */
@media (max-width: 1160px) {
  .toc, .share-rail { display: none; }
  .fn-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 900px) {
  .fn-featured { grid-template-columns: 1fr; }
  .fn-featured-media { min-height: 280px; }
  .fn-featured-body { padding: 36px 32px 32px; }
  .brief { grid-template-columns: 1fr; padding: 52px 36px; }
}
@media (max-width: 720px) {
  .fn-hero-inner { padding: 140px 24px 44px; }
  .fn-featured-wrap, .fn-band-inner { padding-left: 24px; padding-right: 24px; }
  .brief-wrap, .article-shell, .article-figure, .related-band, .article-cta-wrap { padding-left: 24px; padding-right: 24px; }
  .article-hero-inner { padding: 140px 24px 40px; }
  .fn-grid { grid-template-columns: 1fr; }
  .fn-search { min-width: 0; width: 100%; }
  .article-figure .frame { height: 300px; }
  .brief-form { flex-direction: column; border-radius: var(--radius-lg); padding: 16px; gap: 12px; }
  .brief-form input[type="email"] { padding: 8px 8px 0; }
  .brief-note { padding-left: 16px; }
}