/* elmtowers.com — editorial layout modelled on anthropic.com.
   Ivory canvas, slate ink, a sans for headings and a serif for reading. Flat colour illustrations.
   Motion is quiet: short fades and lifts, transform and opacity only. */

@font-face { font-family: "Elm Sans"; src: url("/fonts/hanken.woff2") format("woff2"); font-weight: 300 700; font-display: swap; }
@font-face { font-family: "Elm Serif"; src: url("/fonts/serif.woff2") format("woff2"); font-weight: 300 700; font-style: normal; font-display: swap; }
@font-face { font-family: "Elm Serif"; src: url("/fonts/serif-italic.woff2") format("woff2"); font-weight: 300 700; font-style: italic; font-display: swap; }

:root {
  --ivory: #faf9f5;
  --ivory-2: #f0eee6;
  --oat: #e3dacc;
  --clay: #d97757;
  --slate: #141413;
  --slate-2: #3d3d3a;
  --cloud: #87867f;
  --line: rgba(20, 20, 19, 0.12);
  --line-strong: rgba(20, 20, 19, 0.24);
  --ink: var(--slate);
  --ink-2: var(--slate-2);
  --muted: var(--cloud);
  --wash: var(--ivory-2);
  --display: "Elm Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --sans: "Elm Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --serif: "Elm Serif", Georgia, "Times New Roman", serif;
  --out: cubic-bezier(0.16, 1, 0.3, 1);
  --inout: cubic-bezier(0.65, 0, 0.35, 1);
}

html { background: var(--ivory); }
body { background: var(--ivory); color: var(--ink); font-family: var(--sans); overflow-x: hidden; -webkit-font-smoothing: antialiased; }
.shell { width: 100%; max-width: 1360px; margin: 0 auto; padding-inline: clamp(20px, 4vw, 64px); }

.btn { height: 44px; padding: 0 20px; border-radius: 8px; border: 1px solid var(--slate); background: var(--slate); color: var(--ivory); font: 500 15px/1 var(--sans); display: inline-flex; align-items: center; justify-content: center; gap: 8px; transition: background 0.2s, color 0.2s, border-color 0.2s; }
.btn:hover { background: #2b2b29; border-color: #2b2b29; }
.btn--sm { height: 38px; padding: 0 16px; font-size: 14.5px; }
.btn--line { background: transparent; color: var(--ink); border-color: var(--line-strong); }
.btn--line:hover { background: var(--ivory-2); border-color: var(--slate); color: var(--ink); }
.btn--paper { background: var(--ivory); color: var(--slate); border-color: var(--ivory); }
.btn--block { width: 100%; }

.logo { display: inline-flex; align-items: center; gap: 9px; color: var(--ink); }
.logo__mark { width: 19px; height: 23px; flex: none; }
.logo__word { font: 600 17px/1 var(--display); letter-spacing: 0.08em; text-transform: uppercase; }
.logo--light { color: var(--ivory); }

/* ---------- Nav ---------- */
.nav { position: sticky; top: 0; z-index: 30; }
.nav::before { content: ""; position: absolute; inset: 0; background: rgba(250, 249, 245, 0.9); backdrop-filter: saturate(1.6) blur(18px); -webkit-backdrop-filter: saturate(1.6) blur(18px); border-bottom: 1px solid var(--line); opacity: 0; transition: opacity 0.4s var(--out); z-index: -1; }
.nav.is-scrolled::before, .nav.is-open::before { opacity: 1; }
.nav__in { display: flex; align-items: center; height: 72px; gap: 20px; }
.nav__cta { display: flex; align-items: center; gap: 8px; }
.nav__link { padding: 8px 12px; font-size: 14px; color: var(--ink-2); border-radius: 8px; transition: background 0.2s, color 0.2s; }
.nav__link:hover { background: var(--wash); color: var(--ink); }

.menu { margin-left: auto; margin-right: auto; }
.menu__list { display: flex; gap: 2px; }
.menu__item { position: relative; }
.menu__btn { display: inline-flex; align-items: center; gap: 6px; height: 36px; padding: 0 14px; border: 0; border-radius: 8px; background: none; font-size: 15px; color: var(--ink); transition: background 0.2s, color 0.2s; }
button.menu__btn::after { content: ""; width: 5px; height: 5px; border-right: 1.5px solid currentColor; border-bottom: 1.5px solid currentColor; transform: translateY(-2px) rotate(45deg); opacity: 0.55; transition: transform 0.35s var(--out); }
.menu__btn:hover, .menu__btn[aria-expanded="true"] { background: var(--wash); color: var(--ink); }
.menu__btn[aria-expanded="true"]::after { transform: translateY(1px) rotate(225deg); }

.drop { position: absolute; top: calc(100% + 10px); left: 0; width: 300px; padding: 8px; background: var(--ivory); border: 1px solid var(--line); border-radius: 12px; box-shadow: 0 2px 4px rgba(12, 12, 13, 0.04), 0 24px 48px -16px rgba(12, 12, 13, 0.18);
  opacity: 0; visibility: hidden; transform: translate3d(0, -6px, 0) scale(0.98); transform-origin: top left;
  transition: opacity 0.22s var(--out), transform 0.32s var(--out), visibility 0s linear 0.32s; }
.drop::before { content: ""; position: absolute; left: 0; right: 0; top: -12px; height: 12px; }
.menu__btn[aria-expanded="true"] + .drop { opacity: 1; visibility: visible; transform: none; transition: opacity 0.22s var(--out), transform 0.32s var(--out), visibility 0s; }
.drop__list a { display: grid; gap: 2px; padding: 10px 14px; border-radius: 12px; transition: background 0.2s; }
.drop__list a:hover { background: var(--wash); }
.drop__list b { font-weight: 500; font-size: 14.5px; }
.drop__list small { font-size: 13px; color: var(--muted); }
.menu__auth { display: none; }

.burger { display: none; position: relative; width: 40px; height: 40px; border: 0; border-radius: 8px; background: none; }
.burger span { position: absolute; left: 12px; right: 12px; height: 1.5px; background: var(--ink); transition: transform 0.45s var(--out); }
.burger span:first-child { transform: translateY(-3.5px); } .burger span:last-child { transform: translateY(3.5px); }
.nav.is-open .burger span:first-child { transform: rotate(45deg); }
.nav.is-open .burger span:last-child { transform: rotate(-45deg); }

@media (max-width: 900px) {
  .burger { display: block; }
  #nav-signin, #nav-signup { display: none; }
  .menu { position: absolute; top: 100%; left: 0; right: 0; height: calc(100vh - 64px); height: calc(100dvh - 72px); margin: 0; padding: 8px clamp(20px, 4vw, 40px) 32px; background: var(--ivory); overflow-y: auto;
    opacity: 0; visibility: hidden; transform: translate3d(0, -8px, 0); transition: opacity 0.3s var(--out), transform 0.45s var(--out), visibility 0s linear 0.45s; }
  .nav.is-open .menu { opacity: 1; visibility: visible; transform: none; transition: opacity 0.3s var(--out), transform 0.45s var(--out), visibility 0s; }
  .menu__list { flex-direction: column; gap: 0; }
  .menu__item { border-bottom: 1px solid var(--line); }
  .menu__btn { width: 100%; justify-content: space-between; height: 58px; padding: 0; font: 500 20px/1 var(--display); letter-spacing: -0.01em; color: var(--ink); background: none !important; }
  .drop { position: static; width: auto; padding: 0; border: 0; box-shadow: none; opacity: 1; visibility: visible; transform: none; display: grid; grid-template-rows: 0fr; transition: grid-template-rows 0.45s var(--out); }
  .drop > ul { overflow: hidden; }
  .drop::before { display: none; }
  .menu__btn[aria-expanded="true"] + .drop { grid-template-rows: 1fr; }
  .drop__list { padding-bottom: 0; }
  .menu__btn[aria-expanded="true"] + .drop .drop__list { padding-bottom: 12px; }
  .drop__list a { padding: 10px 0; }
  .drop__list a:hover { background: none; }
  .menu__auth { display: grid; gap: 10px; margin-top: 28px; }
}
body.menu-open { overflow: hidden; }

/* ---------- Type ---------- */
.h2 { font: 500 clamp(28px, 3vw, 40px)/1.12 var(--display); letter-spacing: -0.02em; text-wrap: balance; }
.serif { font: 400 18px/1.6 var(--serif); color: var(--ink-2); }
.serif-lg { font: 400 clamp(19px, 1.7vw, 23px)/1.5 var(--serif); color: var(--ink-2); }
.arrow-link { display: inline-flex; gap: 8px; margin-top: 20px; font-size: 15px; font-weight: 500; border-bottom: 1px solid var(--line-strong); padding-bottom: 2px; transition: border-color 0.2s; }
.arrow-link:hover { border-color: var(--ink); }
.arrow-link span { transition: transform 0.3s var(--out); }
.arrow-link:hover span { transform: translateX(3px); }
.section { padding-top: clamp(88px, 10vw, 144px); }
.section__head { padding-bottom: 28px; border-bottom: 1px solid var(--line); }
.split { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); gap: 24px; padding-bottom: 48px; }
.split > :first-child { grid-column: 1 / span 5; }
.split__body { grid-column: 7 / -1; }
.split--tight { padding: 40px 0 56px; }

/* ---------- Hero ---------- */
.hero { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); gap: 24px; align-items: end; padding-top: clamp(72px, 10vw, 152px); padding-bottom: clamp(56px, 7vw, 96px); }
.hero__title { grid-column: 1 / span 8; font: 500 clamp(40px, 5.4vw, 76px)/1.06 var(--display); letter-spacing: -0.03em; text-wrap: balance; }
.hero__title a { text-decoration: underline; text-decoration-thickness: 0.06em; text-underline-offset: 0.12em; text-decoration-color: var(--line-strong); transition: text-decoration-color 0.25s; }
.hero__title a:hover { text-decoration-color: var(--clay); }
.hero__lede { grid-column: 10 / -1; font: 400 18px/1.55 var(--serif); color: var(--ink-2); padding-bottom: 0.5em; }

/* ---------- Feature banner ---------- */
.feature { display: grid; grid-template-columns: 5fr 7fr; min-height: 460px; border-radius: 16px; overflow: hidden; background: var(--clay); color: var(--slate); }
.feature__text { display: flex; flex-direction: column; justify-content: flex-end; gap: 14px; padding: clamp(28px, 4vw, 56px); background: var(--slate); color: var(--ivory); }
.feature__t { font: 500 clamp(32px, 3.6vw, 52px)/1.05 var(--display); letter-spacing: -0.03em; }
.feature__text p { font: 400 18px/1.5 var(--serif); color: rgba(250, 249, 245, 0.72); max-width: 30ch; margin-bottom: 14px; }
.feature__text .btn { align-self: flex-start; }
.feature__img { position: relative; overflow: hidden; background: var(--clay); }
.feature__img img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; transition: transform 1.4s var(--out); }
.feature:hover .feature__img img { transform: scale(1.03); }

/* ---------- Releases ---------- */
.releases { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); }
.rel { display: flex; flex-direction: column; padding: 32px 32px 8px 0; }
.rel + .rel { padding-left: 32px; border-left: 1px solid var(--line); }
.rel__t { font: 500 24px/1.2 var(--display); letter-spacing: -0.015em; }
.rel__p { margin-top: 14px; font: 400 17px/1.55 var(--serif); color: var(--ink-2); }
.rel dl { margin-top: 28px; border-top: 1px solid var(--line); }
.rel dl div { display: grid; grid-template-columns: 96px 1fr; padding: 11px 0; border-bottom: 1px solid var(--line); font-size: 14px; }
.rel dt { color: var(--muted); }
.rel dd { color: var(--ink); }
.rel dd a { text-decoration: underline; text-underline-offset: 3px; text-decoration-color: var(--line-strong); }
.rel__go { margin-top: auto; padding-top: 28px; }

/* ---------- Research cards ---------- */
.cards { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 24px; }
.rcard { display: block; }
.rcard__img { aspect-ratio: 1; border-radius: 12px; overflow: hidden; background: var(--oat); }
.rcard__img img { width: 100%; height: 100%; object-fit: cover; transition: transform 1.2s var(--out); }
.rcard:hover .rcard__img img { transform: scale(1.04); }
.rcard__k { margin-top: 18px; font-size: 14px; color: var(--muted); }
.rcard__t { margin-top: 6px; font: 500 22px/1.25 var(--display); letter-spacing: -0.015em; }
.rcard:hover .rcard__t { text-decoration: underline; text-underline-offset: 4px; text-decoration-thickness: 1px; }

/* ---------- Products list ---------- */
.plist { border-top: 1px solid var(--line); }
.plist a { display: grid; grid-template-columns: 56px minmax(0, 3fr) minmax(0, 5fr) 150px 24px; gap: 24px; align-items: center; padding: 26px 0; border-bottom: 1px solid var(--line); transition: background 0.3s; }
.plist a:hover { background: linear-gradient(90deg, transparent, var(--ivory-2) 20%, var(--ivory-2) 80%, transparent); }
.plist__icon { width: 44px; height: 44px; display: grid; place-items: center; border-radius: 10px; background: var(--c, var(--oat)); }
.plist__icon svg { width: 22px; height: 22px; fill: none; stroke: var(--slate); stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }
.plist__t { font: 500 22px/1.2 var(--display); letter-spacing: -0.015em; }
.plist__p { font: 400 16.5px/1.5 var(--serif); color: var(--ink-2); }
.plist__s { display: inline-flex; align-items: center; gap: 8px; font-size: 14px; color: var(--ink-2); }
.plist__s::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--cloud); }
.plist__s--live::before { background: #5f8f5c; }
.plist__s--early::before { background: var(--clay); }
.plist__go { font-size: 18px; transition: transform 0.3s var(--out); }
.plist a:hover .plist__go { transform: translateX(4px); }

/* ---------- Mission ---------- */
.mission { margin-top: clamp(96px, 11vw, 160px); padding: clamp(88px, 10vw, 140px) 0 clamp(72px, 8vw, 112px); background: var(--ivory-2); }
.mission__t { max-width: 20ch; font: 500 clamp(34px, 4.4vw, 64px)/1.08 var(--display); letter-spacing: -0.03em; text-wrap: balance; }
.rows { border-top: 1px solid var(--line-strong); }
.rows a { display: grid; grid-template-columns: minmax(0, 1fr) 200px 24px; gap: 24px; align-items: center; padding: 24px 0; border-bottom: 1px solid var(--line-strong); }
.rows__t { font: 400 clamp(20px, 1.8vw, 26px)/1.3 var(--serif); transition: transform 0.4s var(--out); }
.rows__k { font-size: 14px; color: var(--muted); }
.rows__go { transition: transform 0.3s var(--out); }
.rows a:hover .rows__t { transform: translateX(6px); }
.rows a:hover .rows__go { transform: translateX(4px); }

/* ---------- ID card ---------- */
.idcard { display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); gap: 48px; align-items: end; padding: clamp(32px, 5vw, 64px); border-radius: 16px; background: var(--oat); }
.idcard .serif { margin-top: 16px; max-width: 46ch; }
.idcard__cta { display: flex; flex-wrap: wrap; gap: 10px; justify-content: flex-end; }

/* ---------- Footer ---------- */
.foot { margin-top: clamp(96px, 11vw, 160px); background: var(--slate); color: var(--ivory); }
.foot__in { display: grid; grid-template-columns: 2fr repeat(4, minmax(0, 1fr)); gap: 40px 32px; padding-top: 72px; padding-bottom: 88px; }
.foot__brand { display: flex; flex-direction: column; justify-content: space-between; gap: 32px; }
.foot__copy { font-size: 13px; color: rgba(250, 249, 245, 0.5); }
.foot__h { font-size: 14px; font-weight: 500; color: rgba(250, 249, 245, 0.55); }
.foot ul { display: grid; gap: 10px; margin-top: 18px; font-size: 14.5px; }
.foot ul a { color: var(--ivory); opacity: 0.9; transition: opacity 0.2s; }
.foot ul a:hover { opacity: 1; text-decoration: underline; text-underline-offset: 3px; }

/* ---------- Responsive ---------- */
@media (max-width: 1000px) {
  .hero__title { grid-column: 1 / -1; }
  .hero__lede { grid-column: 1 / span 9; }
  .feature { grid-template-columns: 1fr; }
  .feature__img { aspect-ratio: 16 / 10; order: -1; }
  .releases { grid-template-columns: 1fr; }
  .rel, .rel + .rel { padding: 28px 0; border-left: 0; border-bottom: 1px solid var(--line); }
  .split > :first-child, .split__body { grid-column: 1 / -1; }
  .plist a { grid-template-columns: 52px minmax(0, 1fr) 24px; row-gap: 6px; }
  .plist__p, .plist__s { grid-column: 2; }
  .plist__go { grid-column: 3; grid-row: 1; }
  .idcard { grid-template-columns: 1fr; }
  .idcard__cta { justify-content: flex-start; }
  .foot__in { grid-template-columns: 1fr 1fr; }
  .foot__brand { grid-column: 1 / -1; }
}
@media (max-width: 700px) {
  .hero__lede { grid-column: 1 / -1; }
  .cards { grid-template-columns: 1fr; gap: 36px; }
  .rows a { grid-template-columns: minmax(0, 1fr) 24px; row-gap: 4px; }
  .rows__k { grid-row: 2; }
  .rows__go { grid-row: 1 / span 2; grid-column: 2; }
  .idcard__cta .btn { width: 100%; }
}

/* ---------- Reveal ---------- */
@media (prefers-reduced-motion: no-preference) {
  .js .rv { opacity: 0; transform: translate3d(0, 16px, 0); transition: opacity 0.8s var(--out), transform 1s var(--out); transition-delay: var(--d, 0ms); }
  .js .rv.is-in { opacity: 1; transform: none; }
}