/* ============================================================
   Sautner Studio — landing page
   ============================================================ */

:root {
  --bg: #F7F3EC;
  --ink: #1C1810;
  --muted: #6B6357;
  --rust: #9A3B1E;
  --clay: #C88A6A;

  --line: rgba(28, 24, 16, 0.12);
  --line-mid: rgba(28, 24, 16, 0.15);
  --line-strong: rgba(28, 24, 16, 0.25);

  --serif: "Instrument Serif", Georgia, serif;
  --sans: "Space Grotesk", system-ui, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, monospace;

  --wrap: 1200px;
  --pad: 32px;
  --nav-h: 80px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

/* ---------- Shared type helpers ---------- */
.kicker {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--rust);
  margin: 0 0 16px;
}

.micro {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--rust);
  margin: 0 0 12px;
}

/* Full-width band carries the section's top border; .wrap constrains content. */
.band { scroll-margin-top: var(--nav-h); }
.band--bordered { border-top: 1px solid var(--line); }
.wrap {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 88px var(--pad);
}
/* the footer wrap is tighter than a content section */
.footer.wrap { padding: 24px var(--pad); }

.section__title {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(32px, 4vw, 44px);
  line-height: 1.1;
  margin: 0 0 48px;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  border-radius: 100px;
  font-family: var(--sans);
  font-size: 15px;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  padding: 15px 30px;
  border: 1px solid transparent;
  transition: transform 0.15s ease, background 0.15s ease, color 0.15s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn--solid { background: var(--ink); color: var(--bg); }
.btn--solid:hover { background: #322b1e; }
.btn--ghost { border-color: var(--line-strong); color: var(--ink); }
.btn--ghost:hover { border-color: var(--ink); }
.btn--sm { padding: 10px 20px; font-size: 13px; }
.btn--block { width: 100%; padding: 16px; border: none; }

/* ---------- Nav ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(247, 243, 236, 0.92);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.nav__inner {
  max-width: var(--wrap);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px var(--pad);
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--ink);
}
.brand__mark {
  width: 32px;
  height: 32px;
  border: 1.5px solid var(--ink);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--serif);
  font-size: 20px;
  line-height: 1;
}
.brand__name { font-family: var(--serif); font-size: 21px; }

.nav__links {
  display: flex;
  align-items: center;
  gap: 32px;
  font-size: 14px;
}
.nav__links a { color: var(--muted); text-decoration: none; }
.nav__links a:hover { color: var(--ink); }
.nav__links a.btn { color: var(--bg); }

/* ---------- Hero ---------- */
.hero {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: clamp(64px, 9vw, 104px) var(--pad) 80px;
}
.hero__title {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(46px, 8vw, 80px);
  line-height: 1.04;
  margin: 0 0 28px;
  max-width: 900px;
}
.hero__title em { color: var(--rust); font-style: italic; }
.hero__lede {
  font-size: clamp(17px, 2vw, 19px);
  line-height: 1.6;
  color: var(--muted);
  max-width: 620px;
  margin: 0 0 40px;
  text-wrap: pretty;
}
.hero__cta { display: flex; gap: 14px; align-items: center; flex-wrap: wrap; }

/* ---------- Platform strip ---------- */
.strip {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.strip__item {
  flex: 1;
  padding: 20px 8px;
  text-align: center;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--muted);
  border-right: 1px solid var(--line);
}
.strip__item:last-child { border-right: none; }

/* ---------- Process stepper ---------- */
.process__grid {
  display: grid;
  grid-template-columns: 400px 1fr;
  gap: 56px;
  align-items: start;
}
.stepper { display: flex; flex-direction: column; gap: 10px; }

.step {
  display: flex;
  align-items: baseline;
  gap: 18px;
  padding: 20px 24px;
  border-radius: 8px;
  cursor: pointer;
  text-align: left;
  font-family: var(--sans);
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--line-mid);
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}
.step:hover { border-color: var(--line-strong); }
.step.is-active { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.step__num { font-family: var(--mono); font-size: 13px; color: var(--rust); }
.step.is-active .step__num { color: var(--clay); }
.step__text { display: block; }
.step__title { display: block; font-size: 18px; font-weight: 600; }
.step__short { display: block; font-size: 13.5px; opacity: 0.65; margin-top: 3px; }

.panels {
  border-left: 1px solid var(--line-mid);
  padding-left: 56px;
  min-height: 340px;
}
.panel { display: none; }
.panel.is-active { display: block; animation: fade 0.35s ease; }
@keyframes fade { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

.panel__num {
  font-family: var(--serif);
  font-size: 90px;
  line-height: 1;
  color: var(--rust);
  opacity: 0.25;
}
.panel__title {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 32px;
  margin: 12px 0 16px;
}
.panel__body {
  font-size: 16.5px;
  line-height: 1.65;
  color: var(--muted);
  max-width: 520px;
  margin: 0 0 28px;
  text-wrap: pretty;
}

.chips { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 10px; }
.chip {
  border: 1px solid var(--line-strong);
  border-radius: 100px;
  padding: 8px 16px;
  font-size: 13.5px;
}

/* ---------- Expertise cards ---------- */
.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.card {
  border: 1px solid var(--line-mid);
  border-radius: 10px;
  padding: 28px;
  transition: border-color 0.2s ease, transform 0.2s ease;
}
.card:hover { border-color: var(--line-strong); transform: translateY(-2px); }
.card__title { font-size: 17px; font-weight: 600; margin: 0 0 12px; }
.card__body { font-size: 14px; line-height: 1.8; color: var(--muted); margin: 0; }

/* ---------- About + contact ---------- */
.about {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 72px;
  scroll-margin-top: var(--nav-h);
}
.about__title {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 36px;
  margin: 0 0 20px;
}
.about__body { font-size: 16px; line-height: 1.7; color: var(--muted); text-wrap: pretty; margin: 0; }
.about__email {
  display: inline-block;
  font-family: var(--mono);
  font-size: 14px;
  margin-top: 28px;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}
.about__email:hover { border-bottom-color: var(--ink); }

.form { display: flex; flex-direction: column; gap: 14px; }
.field {
  font-family: var(--sans);
  font-size: 15px;
  padding: 16px 18px;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  background: transparent;
  color: var(--ink);
  width: 100%;
}
.field::placeholder { color: var(--muted); }
.field:focus { outline: none; border-color: var(--ink); }
textarea.field { resize: vertical; }

/* ---------- Footer ---------- */
.footer {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 12.5px;
  color: var(--muted);
}
.footer__mono { font-family: var(--mono); }

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 900px) {
  .process__grid { grid-template-columns: 1fr; gap: 32px; }
  .panels { border-left: none; padding-left: 0; border-top: 1px solid var(--line-mid); padding-top: 32px; min-height: 0; }
  .cards { grid-template-columns: repeat(2, 1fr); }
  .about { grid-template-columns: 1fr; gap: 40px; }
}

@media (max-width: 640px) {
  :root { --pad: 20px; }
  .nav__links { gap: 18px; font-size: 13px; }
  .nav__links a[href="#process"],
  .nav__links a[href="#expertise"],
  .nav__links a[href="#about"] { display: none; }
  .strip { flex-wrap: wrap; }
  .strip__item { flex: 1 0 33.33%; border-bottom: 1px solid var(--line); }
  .cards { grid-template-columns: 1fr; }
  .hero__cta .btn { flex: 1; text-align: center; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .btn, .card, .panel.is-active { transition: none; animation: none; }
}