/* ==========================================================================
   Phrenova Lab — style.css
   Tokens → base → layout → components → sections → responsive
   ========================================================================== */

/* ---------- Fonts (self-hosted, Latin) ---------- */
@font-face {
  font-family: "Instrument Serif";
  src: url("../assets/fonts/InstrumentSerif-Regular.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Instrument Serif";
  src: url("../assets/fonts/InstrumentSerif-Italic.woff2") format("woff2");
  font-weight: 400;
  font-style: italic;
  font-display: swap;
}
@font-face {
  font-family: "Instrument Sans";
  src: url("../assets/fonts/InstrumentSans-Variable.woff2") format("woff2-variations"),
       url("../assets/fonts/InstrumentSans-Variable.woff2") format("woff2");
  font-weight: 400 700;
  font-stretch: 75% 100%;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Instrument Sans";
  src: url("../assets/fonts/InstrumentSans-Italic-Variable.woff2") format("woff2-variations"),
       url("../assets/fonts/InstrumentSans-Italic-Variable.woff2") format("woff2");
  font-weight: 400 700;
  font-stretch: 75% 100%;
  font-style: italic;
  font-display: swap;
}

/* ---------- Tokens ---------- */
:root {
  /* colour — navy and periwinkle are sampled from the logo; gold is the brand accent */
  --navy: #061c58;
  --ink: #1d2749;
  --ink-soft: #4b5470;
  --muted: #7c8399;
  --line: rgba(6, 28, 88, 0.14);
  --line-soft: rgba(6, 28, 88, 0.08);
  --paper: #f7f7f5;
  --paper-2: #efefec;
  --paper-3: #e7e8e5;
  --sky: #5a80c4;
  --gold: #c9a24b;
  --white: #ffffff;

  /* type */
  --serif: "Instrument Serif", "Noto Serif SC", "Noto Serif CJK SC", "Songti SC", "STSong", "SimSun", serif;
  --sans: "Instrument Sans", "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Noto Sans CJK SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;

  /* scale (1.25 major third on a 17px base) */
  --fs-xs: 0.8125rem;   /* 13.8 */
  --fs-sm: 0.9rem;      /* 15.3 */
  --fs-base: 1.0625rem; /* 17 */
  --fs-md: 1.2rem;
  --fs-lg: 1.5rem;
  --fs-xl: 1.95rem;
  --fs-2xl: 2.5rem;
  --fs-hero: clamp(2.25rem, 5.4vw, 4.6rem);

  /* layout */
  --measure: 34em;
  --container: 1180px;
  --gutter: clamp(1.25rem, 4vw, 3rem);
  --section-y: clamp(4rem, 8vw, 7.5rem);

  --ease: cubic-bezier(0.4, 0, 0.2, 1);
}

/* ---------- Base ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: var(--fs-base);
  line-height: 1.6;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  font-feature-settings: "kern" 1, "liga" 1, "calt" 1;
}

/* language-specific rhythm */
:lang(zh) body,
body:lang(zh) {
  font-size: 1rem;
  line-height: 1.9;
  letter-spacing: 0.01em;
}

h1, h2, h3, h4 {
  font-family: var(--serif);
  font-weight: 400;
  color: var(--navy);
  margin: 0;
  letter-spacing: -0.005em;
}
:lang(zh) h1, :lang(zh) h2, :lang(zh) h3, :lang(zh) h4 {
  letter-spacing: 0.02em;
}

p { margin: 0; }
p + p { margin-top: 1em; }

a {
  color: inherit;
  text-decoration: none;
}
a:hover { color: var(--navy); }

a.u,
.prose a {
  text-decoration: underline;
  text-decoration-color: var(--line);
  text-underline-offset: 0.2em;
  text-decoration-thickness: 1px;
  transition: text-decoration-color 200ms var(--ease);
}
a.u:hover,
.prose a:hover { text-decoration-color: var(--navy); }

ul, ol { margin: 0; padding: 0; list-style: none; }

img { display: block; max-width: 100%; height: auto; }

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

:focus-visible {
  outline: 2px solid var(--sky);
  outline-offset: 3px;
  border-radius: 2px;
}

.nb { white-space: nowrap; }

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- Layout ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section {
  padding-block: var(--section-y);
  border-top: 1px solid var(--line-soft);
}
.section--flush { border-top: 0; }

/* editorial two-column: label on the left, content on the right */
.grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 2.4fr);
  column-gap: clamp(2rem, 6vw, 6rem);
  align-items: start;
}

.aside {
  position: sticky;
  top: 6rem;
}
.aside__label {
  font-size: var(--fs-sm);
  color: var(--muted);
  margin: 0;
}

.thesis {
  font-size: var(--fs-2xl);
  line-height: 1.15;
  max-width: 20em;
  margin-bottom: 2.25rem;
  text-wrap: balance;
}
:lang(zh) .thesis { line-height: 1.35; }

.prose {
  max-width: var(--measure);
  color: var(--ink-soft);
}
.prose--lg {
  font-size: var(--fs-md);
  color: var(--ink);
}
:lang(en) .prose { max-width: 62ch; }

/* ---------- Header ---------- */
.header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(247, 247, 245, 0.86);
  background: color-mix(in srgb, var(--paper) 86%, transparent);
  -webkit-backdrop-filter: saturate(140%) blur(12px);
  backdrop-filter: saturate(140%) blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 300ms var(--ease);
}
.header.is-scrolled { border-bottom-color: var(--line-soft); }

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.5rem;
  gap: 1.5rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  flex: 0 0 auto;
}
.brand img { width: 136px; height: auto; }

.nav {
  display: flex;
  align-items: center;
  gap: 2rem;
  font-size: var(--fs-sm);
}
.nav a {
  color: var(--ink-soft);
  transition: color 200ms var(--ease);
}
.nav a:hover { color: var(--navy); }

.header__tools {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.cta {
  font-size: var(--fs-sm);
  color: var(--navy);
  padding: 0.45rem 0.95rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  line-height: 1;
  white-space: nowrap;
  transition: border-color 200ms var(--ease), background-color 200ms var(--ease);
}
.cta:hover { border-color: var(--navy); }

.lang {
  font-size: var(--fs-sm);
  color: var(--ink-soft);
  padding: 0.35rem 0;
  border-bottom: 1px solid var(--line);
  line-height: 1;
  transition: color 200ms var(--ease), border-color 200ms var(--ease);
}
.lang:hover { color: var(--navy); border-bottom-color: var(--navy); }

.menu-btn {
  display: none;
  width: 2.25rem;
  height: 2.25rem;
  align-items: center;
  justify-content: center;
}
.menu-btn span,
.menu-btn span::before,
.menu-btn span::after {
  display: block;
  width: 18px;
  height: 1px;
  background: var(--navy);
  position: relative;
  transition: transform 240ms var(--ease), opacity 240ms var(--ease);
}
.menu-btn span::before,
.menu-btn span::after { content: ""; position: absolute; left: 0; }
.menu-btn span::before { top: -6px; }
.menu-btn span::after  { top: 6px; }
.menu-btn[aria-expanded="true"] span { background: transparent; }
.menu-btn[aria-expanded="true"] span::before { transform: translateY(6px) rotate(45deg); }
.menu-btn[aria-expanded="true"] span::after  { transform: translateY(-6px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  overflow: hidden;
  padding-top: clamp(4rem, 10vw, 8rem);
  padding-bottom: 0;
}
.hero > .container,
.hero > .breath { position: relative; z-index: 1; }

/* background photo — muted, then dissolved into the paper so the type stays first */
.hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  background: var(--paper-2);
}
.hero__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 45%;
  filter: saturate(0.45) brightness(1.05) contrast(0.92);
  opacity: 0.85;
}
.hero__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg,
      var(--paper) 0%,
      var(--paper) 26%,
      rgba(247, 247, 245, 0.9) 46%,
      rgba(247, 247, 245, 0.55) 68%,
      rgba(247, 247, 245, 0.3) 100%),
    linear-gradient(180deg,
      rgba(247, 247, 245, 0.7) 0%,
      rgba(247, 247, 245, 0) 28%,
      rgba(247, 247, 245, 0) 58%,
      var(--paper) 100%);
}
.hero__kicker {
  font-size: var(--fs-sm);
  color: var(--muted);
  margin-bottom: 2.5rem;
}
.hero__title {
  font-size: var(--fs-hero);
  line-height: 1.08;
  max-width: 12em;
  text-wrap: balance;
}
:lang(zh) .hero__title { font-size: clamp(2rem, 5.2vw, 4.4rem); line-height: 1.28; max-width: 11em; }

.hero__lede {
  margin-top: 2.5rem;
  max-width: var(--measure);
  font-size: var(--fs-md);
  color: var(--ink-soft);
}
.hero__lede .line { display: block; }
:lang(en) .hero__lede { max-width: 56ch; }

.hero__meta {
  margin-top: 2rem;
  font-size: var(--fs-sm);
  color: var(--muted);
}

/* the breath line — one line, breathing at 0.1 Hz (six breaths a minute) */
.breath {
  position: relative;
  margin-top: clamp(3rem, 7vw, 5.5rem);
  height: 140px;
}
.breath svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  overflow: visible;
}
.breath__path {
  fill: none;
  stroke: url(#breathStroke);
  stroke-width: 1.25;
  stroke-linecap: round;
  vector-effect: non-scaling-stroke;
}
.breath__dot { fill: var(--gold); }
.breath__caption {
  position: absolute;
  right: var(--gutter);
  bottom: 0.25rem;
  font-size: var(--fs-xs);
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

/* ---------- About ---------- */
.etym {
  display: grid;
  grid-template-columns: 7rem 1fr;
  row-gap: 1.75rem;
  column-gap: 1.5rem;
  max-width: 40em;
  margin-bottom: 2.25rem;
  padding-bottom: 2.25rem;
  border-bottom: 1px solid var(--line-soft);
}
.etym dt {
  font-family: var(--serif);
  font-size: var(--fs-xl);
  line-height: 1;
  color: var(--navy);
}
.etym dd {
  margin: 0;
  color: var(--ink-soft);
}
.etym .greek {
  font-family: var(--serif);
  font-style: italic;
  color: var(--navy);
}

/* ---------- Belief ---------- */
.belief {
  padding-block: clamp(3.5rem, 7vw, 6rem);
  background: var(--paper-2);
}
.belief__text {
  font-family: var(--serif);
  font-size: clamp(1.7rem, 3.4vw, 2.7rem);
  line-height: 1.25;
  color: var(--navy);
  max-width: 24em;
  text-wrap: balance;
}
:lang(zh) .belief__text { line-height: 1.5; max-width: 22em; }

/* ---------- Three things ---------- */
.things { border-top: 1px solid var(--line); }
.thing {
  display: grid;
  grid-template-columns: 3.5rem minmax(0, 1fr);
  column-gap: 1.25rem;
  padding-block: 2.5rem;
  border-bottom: 1px solid var(--line);
}
.thing__num {
  font-family: var(--serif);
  font-size: var(--fs-lg);
  line-height: 1;
  color: var(--navy);
  padding-top: 0.2em;
  font-variant-numeric: tabular-nums;
}
.thing__title {
  font-size: var(--fs-xl);
  line-height: 1.15;
  margin-bottom: 0.9rem;
}
.thing__title small {
  display: block;
  font-family: var(--sans);
  font-size: var(--fs-sm);
  color: var(--muted);
  margin-top: 0.4rem;
  letter-spacing: 0;
}
.thing__body { max-width: var(--measure); color: var(--ink-soft); }
:lang(en) .thing__body { max-width: 62ch; }

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 0.75rem;
  margin-top: 1.4rem;
  font-size: var(--fs-xs);
  color: var(--ink-soft);
}
.tags li {
  padding: 0.3rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  white-space: nowrap;
}

/* ---------- Research map ---------- */
.track { padding-block: 2.5rem; border-top: 1px solid var(--line); }
.track:last-child { border-bottom: 1px solid var(--line); }
.track__head {
  display: grid;
  grid-template-columns: 3.5rem minmax(0, 1fr);
  column-gap: 1.25rem;
  align-items: baseline;
}
.track__num {
  font-family: var(--serif);
  font-size: var(--fs-lg);
  color: var(--navy);
  font-variant-numeric: tabular-nums;
}
.track__title { font-size: var(--fs-xl); line-height: 1.15; }
.track__sub {
  font-size: var(--fs-sm);
  color: var(--muted);
  margin-top: 0.35rem;
}
.track__body {
  margin-top: 1.5rem;
  padding-left: 4.75rem;
}
.track__body .prose { margin-bottom: 1.5rem; }

.routes {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  grid-template-rows: repeat(4, auto);
  grid-auto-flow: column;
  gap: 0 2.5rem;
  max-width: 44em;
}
.routes li {
  display: grid;
  grid-template-columns: 1.6rem 1fr;
  gap: 0.75rem;
  padding: 0.7rem 0;
  border-top: 1px solid var(--line-soft);
  font-size: var(--fs-sm);
  color: var(--ink);
}
.routes li span:first-child {
  font-family: var(--serif);
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.outcomes {
  margin-top: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1.75rem;
  font-size: var(--fs-sm);
  color: var(--ink-soft);
}
.outcomes li { display: inline-flex; align-items: center; gap: 0.6rem; }
.outcomes li::before {
  content: "";
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--gold);
  flex: 0 0 auto;
}

.sub { margin-top: 2.25rem; }
.sub + .sub { padding-top: 2.25rem; border-top: 1px solid var(--line-soft); }
.sub__head {
  display: grid;
  grid-template-columns: 3.5rem minmax(0, 1fr);
  column-gap: 1.25rem;
  align-items: baseline;
  margin-bottom: 0.9rem;
}
.sub__num {
  font-family: var(--serif);
  font-size: var(--fs-md);
  color: var(--navy);
  font-variant-numeric: tabular-nums;
}
.sub__title { font-size: var(--fs-lg); line-height: 1.2; }
.sub__body { padding-left: 4.75rem; }

/* pipeline: blood test → AI nutritionist → products */
.flow {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem 0;
  margin: 1.25rem 0 1.5rem;
  font-size: var(--fs-sm);
  color: var(--navy);
}
.flow li { display: inline-flex; align-items: center; }
.flow li + li::before {
  content: "\2192";
  color: var(--muted);
  font-size: 0.9em;
  margin: 0 0.9rem;
}
.flow__node {
  padding: 0.45rem 0.85rem;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--white);
}

.lablist {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.25rem;
  max-width: 44em;
  margin-top: 1rem;
}
.lablist li {
  font-size: var(--fs-sm);
  color: var(--ink);
  padding-top: 0.75rem;
  border-top: 1px solid var(--line-soft);
}
.lablist__cap {
  font-size: var(--fs-sm);
  color: var(--muted);
  margin-top: 1.25rem;
}

.alpha {
  max-width: 44em;
  margin-top: 0.75rem;
}
.alpha li {
  display: grid;
  grid-template-columns: 1.6rem 1fr;
  gap: 0.75rem;
  padding: 0.7rem 0;
  border-top: 1px solid var(--line-soft);
  font-size: var(--fs-sm);
}
.alpha li span:first-child {
  font-family: var(--serif);
  color: var(--muted);
}

.later {
  margin-top: 1.5rem;
  font-size: var(--fs-sm);
  color: var(--ink-soft);
}
.later span { color: var(--muted); }

/* ---------- Two-layer honesty ---------- */
.grades { max-width: 40em; border-top: 1px solid var(--line); }
.grade {
  display: grid;
  grid-template-columns: 4.5rem 1fr;
  column-gap: 1.5rem;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--line);
  align-items: baseline;
}
.dots {
  display: inline-flex;
  gap: 5px;
  align-items: center;
  transform: translateY(-1px);
}
.dots i {
  width: 9px; height: 9px;
  border-radius: 50%;
  border: 1px solid var(--navy);
  display: block;
}
.dots i.on { background: var(--gold); border-color: var(--gold); }
.grade__name {
  font-family: var(--serif);
  font-size: var(--fs-md);
  color: var(--navy);
}
.grade__desc { color: var(--ink-soft); font-size: var(--fs-sm); margin-top: 0.15rem; }

/* ---------- Circle ---------- */
.circle {
  display: grid;
  grid-template-columns: minmax(0, 260px) minmax(0, 1fr);
  column-gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}
.rings { width: 100%; max-width: 260px; height: auto; }
.rings circle { fill: none; stroke: var(--navy); stroke-width: 1; }
.rings circle:nth-child(1) { opacity: 0.25; }
.rings circle:nth-child(2) { opacity: 0.55; }
.rings circle:nth-child(3) { opacity: 1; }
.rings .core { fill: var(--gold); stroke: none; }

.ringlist li {
  display: grid;
  grid-template-columns: 4rem 1fr;
  column-gap: 1.25rem;
  padding: 1rem 0;
  border-top: 1px solid var(--line-soft);
}
.ringlist li:last-child { border-bottom: 1px solid var(--line-soft); }
.ringlist .k {
  font-family: var(--serif);
  color: var(--navy);
  font-size: var(--fs-md);
}
.ringlist .v { color: var(--ink); font-size: var(--fs-sm); }
.ringlist .v b { font-weight: 500; }
.ringlist .v span { display: block; color: var(--muted); margin-top: 0.15rem; }

/* ---------- Founder ---------- */
.founder {
  font-family: var(--serif);
  font-size: var(--fs-lg);
  line-height: 1.4;
  color: var(--navy);
  max-width: 24em;
}
:lang(zh) .founder { line-height: 1.7; }

/* ---------- Join ---------- */
.reasons {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 3rem;
  border-top: 1px solid var(--line);
}
.reasons li {
  padding: 1.75rem 0;
  border-bottom: 1px solid var(--line);
}
.reasons h3 {
  font-size: var(--fs-lg);
  line-height: 1.2;
  margin-bottom: 0.6rem;
}
.reasons p { font-size: var(--fs-sm); color: var(--ink-soft); }

/* ---------- Contact ---------- */
.contact-list { margin-top: 2rem; max-width: 34em; }
.contact-list li {
  display: grid;
  grid-template-columns: 6.5rem 1fr;
  column-gap: 1.25rem;
  padding: 0.9rem 0;
  border-top: 1px solid var(--line-soft);
  font-size: var(--fs-sm);
}
.contact-list li:last-child { border-bottom: 1px solid var(--line-soft); }
.contact-list .k { color: var(--muted); }
.contact-list .v { color: var(--ink); }
.contact-list [hidden] { display: none; }

/* ---------- Footer ---------- */
.footer {
  background: var(--navy);
  color: rgba(255, 255, 255, 0.72);
  padding-block: clamp(3.5rem, 6vw, 5rem) 2.5rem;
  margin-top: var(--section-y);
}
.footer a { color: rgba(255, 255, 255, 0.72); }
.footer a:hover { color: #fff; }
.lang--footer { color: inherit; border-bottom-color: rgba(255, 255, 255, 0.35); }
.lang--footer:hover { color: #fff; border-bottom-color: #fff; }

.footer__close { max-width: 44em; }
.footer__close-text {
  font-family: var(--serif);
  font-size: clamp(1.7rem, 3vw, 2.4rem);
  line-height: 1.2;
  color: #fff;
  max-width: 20em;
  text-wrap: balance;
}
:lang(zh) .footer__close-text { line-height: 1.45; }
.footer__close-sub {
  margin-top: 1.25rem;
  font-size: var(--fs-sm);
  color: rgba(255, 255, 255, 0.72);
  max-width: 40em;
}
.footer__close-link {
  color: #fff;
  border-bottom: 1px solid rgba(255, 255, 255, 0.4);
  padding-bottom: 1px;
  white-space: nowrap;
}
.footer__close-link:hover { border-bottom-color: #fff; }
.footer__wave { margin: 2.5rem 0 2.5rem; }

.footer__top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 2rem;
  flex-wrap: wrap;
}
.footer__brand img { width: 150px; }
.footer__slogan {
  margin-top: 1.5rem;
  font-family: var(--serif);
  font-size: var(--fs-md);
  color: #fff;
  max-width: 24em;
  line-height: 1.5;
}
.footer__cols {
  display: flex;
  gap: 3.5rem;
  font-size: var(--fs-sm);
}
.footer__cols li + li { margin-top: 0.6rem; }
.footer__wave {
  height: 40px;
}
.footer__wave svg { width: 100%; height: 100%; overflow: visible; }
.footer__wave path {
  fill: none;
  stroke: rgba(255, 255, 255, 0.35);
  stroke-width: 1;
  vector-effect: non-scaling-stroke;
}
.footer__bottom {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem 2rem;
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  font-size: var(--fs-xs);
  color: rgba(255, 255, 255, 0.5);
}

/* ---------- Motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
}

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .grid { grid-template-columns: minmax(0, 1fr) minmax(0, 2fr); }
  .routes { grid-template-columns: 1fr; grid-template-rows: none; grid-auto-flow: row; }
  .lablist { grid-template-columns: 1fr; gap: 0.5rem; }
}

@media (max-width: 760px) {
  :root { --section-y: 3.75rem; }

  .grid { grid-template-columns: 1fr; row-gap: 1.25rem; }
  .aside { position: static; }
  .thesis { font-size: var(--fs-xl); margin-bottom: 1.5rem; }

  .nav {
    display: none;
    position: absolute;
    left: 0; right: 0;
    top: 4.5rem;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    background: var(--paper);
    border-bottom: 1px solid var(--line-soft);
    padding: 0.5rem var(--gutter) 1rem;
  }
  .nav.is-open { display: flex; }
  .nav a { padding: 0.75rem 0; width: 100%; border-top: 1px solid var(--line-soft); }
  .menu-btn { display: inline-flex; }
  .cta { display: none; }

  .breath { height: 110px; }
  .hero__bg img { opacity: 0.7; object-position: 70% 45%; }
  .hero__bg::after {
    background:
      linear-gradient(180deg,
        var(--paper) 0%,
        rgba(247, 247, 245, 0.92) 40%,
        rgba(247, 247, 245, 0.55) 70%,
        var(--paper) 100%);
  }
  .breath__caption { right: var(--gutter); }

  .etym { grid-template-columns: 5rem 1fr; }
  .thing, .track__head, .sub__head { grid-template-columns: 2.5rem minmax(0, 1fr); column-gap: 0.9rem; }
  .thing__title, .track__title { font-size: var(--fs-lg); text-wrap: balance; }
  .sub__title { font-size: var(--fs-md); }
  .track__body, .sub__body { padding-left: 0; }
  .circle { grid-template-columns: 1fr; row-gap: 1.5rem; }
  .rings { max-width: 200px; }
  .reasons { grid-template-columns: 1fr; }
  .contact-list li { grid-template-columns: 5.5rem 1fr; }
  .footer__cols { gap: 2rem; }
}