/* ============================================================
   Signals & Systems — marketing site
   Page styles. Foundations come from colors_and_type.css.
   ============================================================ */

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  overflow-x: hidden;
  background: var(--canvas);
  color: var(--body);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* ---- shared layout ---- */
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 40px; }
.band { padding: 104px 0; }
.eyebrow {
  font-family: var(--font-sans);
  font-size: 12px; font-weight: 500; line-height: 1.4;
  letter-spacing: 1.5px; text-transform: uppercase;
  color: var(--primary);
  display: inline-block;
}
.eyebrow.muted { color: var(--muted); }
.eyebrow.on-dark { color: var(--accent-amber); }
.serif { font-family: var(--font-serif); font-weight: 400; }
em { font-style: italic; }

/* numerals — mono, editorial-tech accent */
.num {
  font-family: var(--font-mono); font-size: 12px; font-weight: 500;
  letter-spacing: 0.5px; color: var(--primary);
}

/* ---- buttons ---- */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  font-family: var(--font-sans); font-size: 15px; font-weight: 500;
  height: 48px; padding: 0 26px; border-radius: var(--radius-md);
  text-decoration: none; cursor: pointer; border: 1px solid transparent;
  transition: background .15s ease, border-color .15s ease, transform .15s ease;
}
.btn-primary { background: var(--primary); color: var(--on-primary); }
.btn-primary:hover { background: #bf6e52; }
.btn-primary:active { background: var(--primary-active); transform: translateY(1px); }
.btn-secondary { background: transparent; color: var(--ink); border-color: var(--hairline); }
.btn-secondary:hover { border-color: var(--ink); }
.btn-cream { background: var(--canvas); color: var(--ink); }
.btn-cream:hover { background: #fff; }
.btn-sm { height: 40px; font-size: 14px; padding: 0 18px; }

/* link-arrow */
.linkarrow {
  font-family: var(--font-sans); font-size: 15px; font-weight: 500;
  color: var(--ink); text-decoration: none;
  border-bottom: 1.5px solid var(--primary); padding-bottom: 2px;
  transition: color .15s ease;
}
.linkarrow:hover { color: var(--primary); }

/* ============================================================
   NAV
   ============================================================ */
.nav {
  position: sticky; top: 0; z-index: 50; height: 68px;
  background: rgba(250,249,245,0.82); backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--hairline);
}
.nav-inner {
  max-width: 1120px; margin: 0 auto; height: 100%;
  padding: 0 40px; display: flex; align-items: center; gap: 28px;
}
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.brand img { width: 26px; height: 26px; }
.brand .word {
  font-family: var(--font-sans); font-size: 18px; font-weight: 600;
  letter-spacing: -0.2px; color: var(--ink); white-space: nowrap;
}
.brand .amp { color: var(--primary); }
.nav-links { display: flex; gap: 26px; margin-left: 14px; }
.nav-links a {
  font-family: var(--font-sans); font-size: 14px; font-weight: 500;
  color: var(--muted); text-decoration: none; transition: color .15s ease;
}
.nav-links a:hover { color: var(--ink); }
.nav-right { margin-left: auto; display: flex; align-items: center; gap: 16px; }
.nav-toggle { display: none; background: none; border: none; cursor: pointer; color: var(--ink); margin-left: auto; }
.nav-sheet { display: none; background: var(--canvas); border-bottom: 1px solid var(--hairline); padding: 12px 40px 22px; }
.nav-sheet a { display: block; font-size: 17px; font-weight: 500; color: var(--ink); text-decoration: none; padding: 11px 0; }

/* ============================================================
   HERO
   ============================================================ */
.hero { background: var(--canvas); padding: 92px 0 100px; }
.hero-grid {
  display: grid; grid-template-columns: 1.08fr 0.92fr; gap: 64px; align-items: center;
}
.hero h1 {
  font-family: var(--font-serif); font-weight: 400;
  font-size: clamp(40px, 5vw, 66px); line-height: 1.04;
  letter-spacing: -1.6px; color: var(--ink);
  margin: 20px 0 0; max-width: 15ch; text-wrap: balance;
}
.hero h1 em { font-style: italic; color: var(--primary); }
.hero .lead {
  font-family: var(--font-sans); font-size: 19px; line-height: 1.65;
  color: var(--body-strong); margin: 26px 0 0; max-width: 52ch;
}
.hero-cta { display: flex; gap: 14px; margin-top: 36px; flex-wrap: wrap; }
.hero-art {
  background: var(--surface-soft); border: 1px solid var(--hairline);
  border-radius: var(--radius-xl); padding: 40px;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 26px; min-height: 380px;
}
.hero-art img { width: 100%; max-width: 380px; height: auto; }
.hero-art .tag {
  font-family: var(--font-serif); font-style: italic; font-size: 20px;
  color: var(--muted); text-align: center; letter-spacing: -0.2px;
}

/* ============================================================
   PULL QUOTE
   ============================================================ */
.quote { background: var(--surface-soft); }
.quote-inner { max-width: 860px; margin: 0 auto; text-align: center; padding: 0 40px; }
.quote .mark {
  width: 40px; height: 2px; background: var(--primary);
  border-radius: 1px; margin: 0 auto 34px;
}
.quote h2 {
  font-family: var(--font-serif); font-weight: 400;
  font-size: clamp(30px, 4vw, 46px); line-height: 1.16;
  letter-spacing: -1px; color: var(--ink); margin: 0;
  text-wrap: balance;
}
.quote p {
  font-family: var(--font-sans); font-size: 19px; line-height: 1.6;
  color: var(--muted); margin: 22px 0 0; max-width: 48ch;
  margin-left: auto; margin-right: auto;
}

/* ============================================================
   SECTION HEADER (shared)
   ============================================================ */
.sec-head { max-width: 760px; margin-bottom: 56px; }
.sec-head h2 {
  font-family: var(--font-serif); font-weight: 400;
  font-size: clamp(30px, 3.8vw, 46px); line-height: 1.12;
  letter-spacing: -1px; color: var(--ink);
  margin: 16px 0 0; text-wrap: balance;
}
.sec-head h2 em { font-style: italic; color: var(--primary); }
.sec-head .intro {
  font-family: var(--font-sans); font-size: 18px; line-height: 1.7;
  color: var(--body); margin: 20px 0 0; max-width: 60ch;
}

/* ============================================================
   PROBLEMS  ("who this is for")
   ============================================================ */
.problems { background: var(--canvas); }
.prob-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.prob {
  background: var(--surface-card); border-radius: var(--radius-lg);
  padding: 30px 28px 32px; display: flex; flex-direction: column;
}
.prob .num { margin-bottom: 18px; }
.prob h3 {
  font-family: var(--font-serif); font-weight: 400; font-size: 23px;
  line-height: 1.22; letter-spacing: -0.4px; color: var(--ink);
  margin: 0 0 12px; text-wrap: balance;
}
.prob p { font-family: var(--font-sans); font-size: 15px; line-height: 1.62; color: var(--body); margin: 0; }
.prob-close {
  margin-top: 44px; padding-top: 32px; border-top: 1px solid var(--hairline);
  font-family: var(--font-serif); font-style: italic; font-weight: 400;
  font-size: clamp(21px, 2.3vw, 29px); line-height: 1.3;
  color: var(--ink); max-width: none; text-wrap: balance;
}

/* ============================================================
   WAYS TO WORK (offer ladder)
   ============================================================ */
.ways { background: var(--surface-soft); }
.ways-top { display: grid; grid-template-columns: 1fr 1fr; gap: 72px; align-items: end; margin-bottom: 52px; }
.ways-top h2 {
  font-family: var(--font-serif); font-weight: 400;
  font-size: clamp(30px, 3.8vw, 46px); line-height: 1.12;
  letter-spacing: -1px; color: var(--ink); margin: 16px 0 0; text-wrap: balance;
}
.ways-top h2 em { font-style: italic; color: var(--primary); }
.ways-top .intro { font-family: var(--font-sans); font-size: 17px; line-height: 1.72; color: var(--body); margin: 0; }
.ladder { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.rung {
  background: var(--canvas); border: 1px solid var(--hairline);
  border-radius: var(--radius-lg); padding: 32px 30px 34px;
  display: flex; flex-direction: column; position: relative; overflow: hidden;
  transition: transform .2s ease, box-shadow .2s ease;
}
.rung::before { content: ""; position: absolute; top: 0; left: 0; right: 0; height: 3px; background: var(--primary); }
.rung--2::before { opacity: 0.55; }
.rung--3::before { opacity: 0.35; }
.rung:hover { transform: translateY(-3px); box-shadow: 0 16px 34px -22px rgba(20,20,19,0.3); }
.rung-top { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; margin-bottom: 22px; }
.rung-tag {
  font-family: var(--font-sans); font-size: 11px; font-weight: 600;
  letter-spacing: 1.4px; text-transform: uppercase; color: var(--muted);
}
.rung h3 {
  font-family: var(--font-serif); font-weight: 400; font-size: 25px;
  line-height: 1.18; letter-spacing: -0.4px; color: var(--ink); margin: 0 0 8px;
}
.rung .cadence {
  font-family: var(--font-mono); font-size: 12px; color: var(--primary);
  letter-spacing: 0.3px; margin-bottom: 18px;
}
.rung .desc { font-family: var(--font-sans); font-size: 15px; line-height: 1.66; color: var(--body); margin: 0 0 20px; }
.rung .bestfor {
  margin-top: auto; padding-top: 18px; border-top: 1px solid var(--hairline);
}
.rung .bestfor .lbl {
  font-family: var(--font-sans); font-size: 11px; font-weight: 600;
  letter-spacing: 1.2px; text-transform: uppercase; color: var(--muted-soft);
  display: block; margin-bottom: 7px;
}
.rung .bestfor p { font-family: var(--font-sans); font-size: 14px; line-height: 1.55; color: var(--body); margin: 0; }
.ways-cta {
  margin-top: 48px; padding-top: 36px; border-top: 1px solid var(--hairline);
  display: flex; align-items: center; justify-content: space-between; gap: 28px; flex-wrap: wrap;
}
.ways-cta p {
  font-family: var(--font-serif); font-size: clamp(20px, 2.2vw, 26px); line-height: 1.35;
  color: var(--ink); margin: 0; max-width: 52ch;
}
.ways-cta p em { font-style: italic; color: var(--primary); }

/* ============================================================
   METHODOLOGY (dark band)
   ============================================================ */
.method { background: var(--surface-dark); }
.method-head { text-align: center; max-width: 760px; margin: 0 auto 64px; }
.method-lockup {
  font-family: var(--font-serif); font-weight: 400; font-style: italic;
  font-size: clamp(34px, 4.5vw, 52px); line-height: 1.05; letter-spacing: -1px;
  color: var(--on-dark); margin: 14px 0 0;
}
.method-lockup .amp { color: var(--primary); font-style: normal; }
.method-tagline {
  font-family: var(--font-sans); font-size: 18px; line-height: 1.6;
  color: var(--on-dark-soft); margin: 18px 0 0;
}
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 36px; }
.step { display: flex; flex-direction: column; }
.step .num { color: var(--accent-amber); margin-bottom: 16px; }
.step .bar { width: 100%; height: 1px; background: var(--hairline-dark); margin-bottom: 20px; }
.step h3 {
  font-family: var(--font-serif); font-weight: 400; font-size: 22px;
  line-height: 1.2; letter-spacing: -0.4px; color: var(--on-dark); margin: 0 0 12px;
}
.step p { font-family: var(--font-sans); font-size: 14.5px; line-height: 1.65; color: var(--on-dark-soft); margin: 0; }

/* ============================================================
   ENGAGEMENTS
   ============================================================ */
.eng { background: var(--canvas); }
.eng-grid { display: grid; grid-template-columns: 1fr; gap: 18px; }
.eng-card {
  background: var(--surface-card); border-radius: var(--radius-lg);
  padding: 40px; display: grid; grid-template-columns: 1.15fr 1fr 1fr; gap: 40px;
  align-items: start;
}
.eng-card h3 {
  font-family: var(--font-serif); font-weight: 400; font-size: 27px;
  line-height: 1.2; letter-spacing: -0.5px; color: var(--ink); margin: 0;
  text-wrap: balance;
}
.eng-card .num { display: block; margin-bottom: 14px; }
.eng-block .lbl {
  font-family: var(--font-sans); font-size: 11px; font-weight: 600;
  letter-spacing: 1.3px; text-transform: uppercase; color: var(--primary);
  display: block; margin-bottom: 9px;
}
.eng-block p { font-family: var(--font-sans); font-size: 14.5px; line-height: 1.62; color: var(--body); margin: 0; }
.eng-block + .eng-block { margin-top: 22px; }
.eng-metrics { display: flex; gap: 26px; flex-wrap: wrap; margin-top: 24px; padding-top: 22px; border-top: 1px solid var(--hairline); grid-column: 1 / -1; }
.metric { display: flex; flex-direction: column; gap: 3px; }
.metric .mval { font-family: var(--font-serif); font-size: 30px; line-height: 1; color: var(--primary); letter-spacing: -0.5px; }
.metric .mlbl { font-family: var(--font-sans); font-size: 13px; color: var(--muted); }

/* ============================================================
   ABOUT
   ============================================================ */
.about { background: var(--surface-soft); }
.about-grid { display: grid; grid-template-columns: 400px 1fr; gap: 72px; align-items: start; }
.about-photo { width: 100%; }
.about-img { display: block; color: var(--muted); }
.about-img::part(frame) { background: var(--surface-card); }
.about-img::part(ring) { border-color: var(--hairline); }
.about-caption {
  font-family: var(--font-sans); font-size: 13px; line-height: 1.5;
  color: var(--muted); margin-top: 14px; font-style: italic;
}
.about-copy h2 {
  font-family: var(--font-serif); font-weight: 400;
  font-size: clamp(28px, 3.4vw, 42px); line-height: 1.14;
  letter-spacing: -0.8px; color: var(--ink); margin: 14px 0 26px; text-wrap: balance;
}
.about-copy h2 em { font-style: italic; color: var(--primary); }
.about-copy p { font-family: var(--font-sans); font-size: 16.5px; line-height: 1.78; color: var(--body); margin: 0 0 18px; }
.about-copy p:last-child { margin-bottom: 0; }
.about-copy strong { font-weight: 600; color: var(--ink); }

/* ============================================================
   NEWSLETTER
   ============================================================ */
.news { background: var(--surface-cream-strong); }
.news-inner { max-width: 720px; }
.news h2 {
  font-family: var(--font-serif); font-weight: 400;
  font-size: clamp(28px, 3.4vw, 42px); line-height: 1.14;
  letter-spacing: -0.8px; color: var(--ink); margin: 14px 0 16px; text-wrap: balance;
}
.news h2 em { font-style: italic; color: var(--primary); }
.news p { font-family: var(--font-sans); font-size: 17px; line-height: 1.7; color: var(--body); margin: 0 0 30px; max-width: 56ch; }

/* ============================================================
   CORAL CALLOUT
   ============================================================ */
.callout { background: var(--canvas); padding: 104px 0 0; }
.callout-card {
  max-width: 1120px; margin: 0 auto;
  background: var(--primary); border-radius: var(--radius-lg);
  padding: 72px 48px; text-align: center;
  display: flex; flex-direction: column; align-items: center; gap: 20px;
}
.callout-card h2 {
  font-family: var(--font-serif); font-weight: 400;
  font-size: clamp(32px, 4vw, 50px); line-height: 1.08;
  letter-spacing: -1px; color: var(--on-primary); margin: 0; max-width: 18ch;
}
.callout-card p {
  font-family: var(--font-sans); font-size: 17.5px; line-height: 1.6;
  color: rgba(255,255,255,0.9); margin: 0; max-width: 48ch;
}
.callout-card .btn { margin-top: 8px; }

/* ============================================================
   CONTACT
   ============================================================ */
.contact { background: var(--canvas); }
.contact-grid { display: grid; grid-template-columns: 0.85fr 1fr; gap: 72px; align-items: start; }
.contact-copy h2 {
  font-family: var(--font-serif); font-weight: 400;
  font-size: clamp(30px, 3.6vw, 46px); line-height: 1.1;
  letter-spacing: -1px; color: var(--ink); margin: 14px 0 18px; text-wrap: balance;
}
.contact-copy h2 em { font-style: italic; color: var(--primary); }
.contact-copy p { font-family: var(--font-sans); font-size: 17px; line-height: 1.7; color: var(--body); margin: 0 0 30px; max-width: 42ch; }
.field { display: flex; flex-direction: column; gap: 8px; margin-bottom: 20px; }
.field label {
  font-family: var(--font-sans); font-size: 12px; font-weight: 600;
  letter-spacing: 0.6px; text-transform: uppercase; color: var(--ink);
}
.field input, .field textarea {
  font-family: var(--font-sans); font-size: 16px; color: var(--ink);
  background: var(--surface-soft); border: 1px solid var(--hairline);
  border-radius: var(--radius-md); padding: 13px 15px; outline: none;
  transition: border-color .15s ease, box-shadow .15s ease;
}
.field input::placeholder, .field textarea::placeholder { color: var(--muted-soft); }
.field input:focus, .field textarea:focus { border-color: var(--primary); box-shadow: var(--focus-ring); }
.field textarea { resize: vertical; min-height: 130px; line-height: 1.6; }
.form-thanks { display: none; font-family: var(--font-serif); font-style: italic; font-size: 24px; color: var(--ink); padding: 12px 0; }

/* ============================================================
   FOOTER
   ============================================================ */
.foot { background: var(--surface-dark); padding: 64px 0 36px; }
.foot-top { display: flex; justify-content: space-between; gap: 40px; flex-wrap: wrap; }
.foot .brand .word { color: var(--on-dark); }
.foot-tag { font-family: var(--font-sans); font-size: 14px; color: var(--on-dark-soft); margin: 16px 0 0; }
.foot-links { display: flex; gap: 28px; flex-wrap: wrap; }
.foot-links a { font-family: var(--font-sans); font-size: 14px; color: var(--on-dark); text-decoration: none; opacity: 0.82; }
.foot-links a:hover { opacity: 1; }
.foot-bottom {
  margin-top: 48px; padding-top: 24px; border-top: 1px solid var(--hairline-dark);
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px;
}
.foot-bottom span { font-family: var(--font-sans); font-size: 13px; color: var(--on-dark-soft); }

/* ============================================================
   SCROLL REVEAL
   ============================================================ */
@media (prefers-reduced-motion: no-preference) {
  .reveal { opacity: 0; transform: translateY(22px); transition: opacity .6s ease, transform .6s ease; }
  .reveal.in { opacity: 1; transform: none; }
}

/* ============================================================
   RESPONSIVE
   ============================================================ */

/* ---- Tablet landscape / small laptop (≤1024px) ---- */
@media (max-width: 1024px) {
  .wrap, .nav-inner { padding: 0 32px; }
  .band { padding: 88px 0; }
  .hero { padding: 76px 0 84px; }
  .hero-grid { gap: 48px; }
  .nav-links { gap: 20px; }
  .nav-links a { font-size: 13.5px; }
  /* engagement cards → title full-width, then two content columns */
  .eng-card { grid-template-columns: 1fr 1fr; gap: 28px 40px; padding: 36px; }
  .eng-card > div:first-child { grid-column: 1 / -1; }
  .ways-top { gap: 48px; }
}

/* ---- Tablet portrait (≤960px) ---- */
@media (max-width: 960px) {
  .nav-links, .nav-right { display: none; }
  .nav-toggle { display: inline-flex; }
  .nav-sheet.open { display: block; }
  .hero-grid { grid-template-columns: 1fr; gap: 44px; }
  .hero-art { min-height: 300px; }
  .prob-grid { grid-template-columns: 1fr 1fr; }
  .ways-top { grid-template-columns: 1fr; gap: 18px; }
  .ladder { grid-template-columns: 1fr 1fr; }
  .ladder .rung--3 { grid-column: 1 / -1; }
  .steps { grid-template-columns: 1fr 1fr; gap: 32px 28px; }
  .eng-card { grid-template-columns: 1fr; gap: 24px; }
  .eng-card > div:first-child { grid-column: auto; }
  .about-grid { grid-template-columns: 1fr; gap: 36px; }
  .about-photo { max-width: 340px; margin: 0 auto; width: 100%; }
  .contact-grid { grid-template-columns: 1fr; gap: 40px; }
}

/* ---- Large phone / small tablet (≤680px) ---- */
@media (max-width: 680px) {
  .wrap, .nav-inner { padding: 0 24px; }
  .band { padding: 72px 0; }
  .callout { padding: 72px 0 0; }
  .hero { padding: 56px 0 68px; }
  .hero .lead { font-size: 17px; }
  .prob-grid { grid-template-columns: 1fr; }
  .ladder { grid-template-columns: 1fr; }
  .ladder .rung--3 { grid-column: auto; }
  .steps { grid-template-columns: 1fr; gap: 28px; }
  .ways-cta, .foot-bottom { flex-direction: column; align-items: flex-start; gap: 18px; }
  .foot-top { gap: 28px; }
  .hero-cta { gap: 10px; }
  .hero-cta .btn,
  .contact-copy .btn,
  .ways-cta .btn { width: 100%; }
  .callout-card { padding: 52px 26px; }
  .eng-metrics { gap: 20px; }
  .quote-inner, .contact-copy p, .news p { padding-left: 0; padding-right: 0; }
}

/* ---- Small phone (≤400px) ---- */
@media (max-width: 400px) {
  .wrap, .nav-inner { padding: 0 18px; }
  .band { padding: 60px 0; }
  .hero { padding: 44px 0 56px; }
  .eng-card, .prob, .rung { padding-left: 22px; padding-right: 22px; }
  .eng-metrics { gap: 16px 22px; }
  .metric .mval { font-size: 26px; }
  .brand .word { font-size: 16px; }
  .brand img { width: 22px; height: 22px; }
}