/* =========================================================
   Stillwater Research — Stylesheet
   Palette inspired by the logo: deep forest green + cream.
   ========================================================= */

:root {
  --green-900: #0c2018;
  --green-800: #102a1f;
  --green-700: #163a2b;
  --green-600: #1f4d3a;
  --green-500: #2c6650;
  --green-400: #4f8c75;
  --cream-50:  #f6f1e6;
  --cream-100: #ece4d3;
  --cream-200: #d8cdb6;
  --ink:       #0a160f;
  --muted:     #8aa39a;
  --line:      rgba(246, 241, 230, 0.12);
  --line-strong: rgba(246, 241, 230, 0.22);
  --accent:    #c9a96a;
  --long:      #7fc7a2;
  --short:     #e6a08a;

  --font-serif: "Cormorant Garamond", "Iowan Old Style", Georgia, serif;
  --font-sans:  "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;

  --radius-sm: 6px;
  --radius:    14px;
  --radius-lg: 22px;

  --shadow-soft: 0 30px 80px -40px rgba(0, 0, 0, 0.6);

  --max:       1200px;
  --pad:       clamp(20px, 4vw, 48px);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--cream-50);
  background: var(--green-900);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

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

a { color: inherit; text-decoration: none; }

button { font-family: inherit; cursor: pointer; }

::selection { background: var(--accent); color: var(--green-900); }

.container {
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--pad);
}

/* ---------- Header / Nav ---------- */

.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px var(--pad);
  background: rgba(12, 32, 24, 0.55);
  backdrop-filter: saturate(140%) blur(14px);
  -webkit-backdrop-filter: saturate(140%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: background .3s ease, border-color .3s ease, padding .3s ease;
}

.site-header.is-scrolled {
  background: rgba(12, 32, 24, 0.88);
  border-bottom-color: var(--line);
  padding-top: 12px;
  padding-bottom: 12px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  letter-spacing: 0.02em;
}

.brand-mark {
  width: 40px;
  height: 40px;
  border-radius: 6px;
  object-fit: cover;
  box-shadow: 0 0 0 1px var(--line-strong);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.05;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 18px;
  color: var(--cream-50);
}

.brand-line--light { color: var(--cream-200); font-weight: 500; }

.primary-nav ul {
  list-style: none;
  display: flex;
  gap: 8px;
  padding: 0;
  margin: 0;
}

.nav-link {
  position: relative;
  display: inline-block;
  padding: 8px 14px;
  font-size: 14px;
  font-weight: 500;
  color: var(--cream-100);
  border-radius: 999px;
  transition: color .2s ease, background .2s ease;
}

.nav-link:hover { color: var(--cream-50); background: rgba(246,241,230,0.06); }

.nav-link.is-active {
  color: var(--green-900);
  background: var(--cream-50);
}

.menu-toggle {
  display: none;
  width: 40px; height: 40px;
  background: transparent;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  position: relative;
}

.menu-toggle span {
  position: absolute;
  left: 50%;
  width: 18px; height: 1.5px;
  background: var(--cream-50);
  transform: translateX(-50%);
  transition: transform .25s ease, opacity .25s ease, top .25s ease;
}

.menu-toggle span:nth-child(1) { top: 14px; }
.menu-toggle span:nth-child(2) { top: 19px; }
.menu-toggle span:nth-child(3) { top: 24px; }

.menu-toggle[aria-expanded="true"] span:nth-child(1) {
  top: 19px; transform: translateX(-50%) rotate(45deg);
}
.menu-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.menu-toggle[aria-expanded="true"] span:nth-child(3) {
  top: 19px; transform: translateX(-50%) rotate(-45deg);
}

/* ---------- Hero ---------- */

.hero {
  position: relative;
  min-height: 100vh;
  padding: 160px var(--pad) 100px;
  display: flex;
  align-items: center;
  overflow: hidden;
  isolation: isolate;
}

.hero-bg { position: absolute; inset: 0; z-index: -1; }

.hero-gradient {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(70% 60% at 80% 10%, rgba(79, 140, 117, 0.35), transparent 60%),
    radial-gradient(60% 50% at 10% 90%, rgba(201, 169, 106, 0.18), transparent 70%),
    linear-gradient(180deg, var(--green-900) 0%, var(--green-800) 60%, var(--green-900) 100%);
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 80px 80px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
  opacity: 0.5;
}

.hero-inner { width: 100%; max-width: var(--max); margin: 0 auto; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 22px;
  padding: 6px 14px;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cream-100);
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: rgba(246, 241, 230, 0.04);
}

.eyebrow::before {
  content: "";
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 12px var(--accent);
}

.hero-title {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: clamp(44px, 7vw, 96px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  margin: 0 0 28px;
  color: var(--cream-50);
}

.hero-title em {
  font-style: italic;
  font-weight: 400;
  color: var(--cream-200);
}

.hero-sub {
  max-width: 620px;
  margin: 0 0 36px;
  font-size: clamp(16px, 1.5vw, 19px);
  line-height: 1.65;
  color: var(--cream-100);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 72px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 24px;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.02em;
  border: 1px solid transparent;
  border-radius: 999px;
  transition: transform .15s ease, background .2s ease, color .2s ease, border-color .2s ease;
}

.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn-primary {
  background: var(--cream-50);
  color: var(--green-900);
}
.btn-primary:hover { background: #fff; }

.btn-ghost {
  background: transparent;
  color: var(--cream-50);
  border-color: var(--line-strong);
}
.btn-ghost:hover { background: rgba(246,241,230,0.06); border-color: var(--cream-200); }

.btn-block { width: 100%; padding: 16px 24px; }

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0;
  border-top: 1px solid var(--line);
  padding-top: 28px;
  margin: 0;
  max-width: 880px;
}

.hero-stats > div {
  padding: 0 22px;
  border-left: 1px solid var(--line);
}
.hero-stats > div:first-child { padding-left: 0; border-left: none; }

.hero-stats dt {
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 8px;
}
.hero-stats dd {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 500;
  color: var(--cream-50);
}

.scroll-cue {
  position: absolute;
  left: 50%;
  bottom: 28px;
  transform: translateX(-50%);
  width: 22px; height: 36px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  display: grid;
  place-items: start center;
  padding-top: 7px;
}
.scroll-cue span {
  display: block;
  width: 2px; height: 8px;
  background: var(--cream-100);
  border-radius: 2px;
  animation: cue 1.6s ease-in-out infinite;
}
@keyframes cue {
  0%   { transform: translateY(0);   opacity: 0; }
  40%  { opacity: 1; }
  100% { transform: translateY(12px); opacity: 0; }
}

/* ---------- Sections (shared) ---------- */

section { padding: clamp(72px, 10vw, 140px) 0; }

.section-eyebrow {
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 18px;
  font-weight: 500;
}

.section-title {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: clamp(32px, 4.5vw, 56px);
  line-height: 1.08;
  letter-spacing: -0.015em;
  margin: 0 0 20px;
  color: var(--cream-50);
  max-width: 22ch;
}

.section-lede {
  max-width: 64ch;
  font-size: clamp(15px, 1.3vw, 18px);
  line-height: 1.7;
  color: var(--cream-100);
  margin: 0;
}

/* ---------- Philosophy ---------- */

.philosophy { background: linear-gradient(180deg, var(--green-900), var(--green-800)); }

.pillars {
  margin-top: 56px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.pillar {
  padding: 36px 30px;
  background: var(--green-800);
  transition: background .25s ease, transform .25s ease;
}
.pillar:hover { background: var(--green-700); }

.pillar-glyph {
  display: inline-block;
  font-size: 22px;
  color: var(--accent);
  margin-bottom: 18px;
}

.pillar h3 {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 600;
  margin: 0 0 12px;
  color: var(--cream-50);
}

.pillar p {
  font-size: 15px;
  line-height: 1.65;
  color: var(--cream-100);
  margin: 0;
}

/* ---------- Research ---------- */

.research { background: var(--green-900); }

.research-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
  margin-bottom: 48px;
}

.research-filter { display: inline-flex; gap: 8px; }

.chip {
  padding: 8px 18px;
  font-size: 13px;
  font-weight: 500;
  color: var(--cream-100);
  background: transparent;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  transition: background .2s ease, color .2s ease, border-color .2s ease;
}
.chip:hover { background: rgba(246,241,230,0.06); color: var(--cream-50); }
.chip.is-active {
  background: var(--cream-50);
  color: var(--green-900);
  border-color: var(--cream-50);
}

.research-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}

.report {
  position: relative;
  padding: 28px 28px 26px;
  background: linear-gradient(180deg, rgba(246,241,230,0.04), rgba(246,241,230,0.015));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: transform .3s ease, border-color .3s ease, background .3s ease;
  display: flex;
  flex-direction: column;
}

.report:hover {
  transform: translateY(-3px);
  border-color: var(--line-strong);
  background: linear-gradient(180deg, rgba(246,241,230,0.07), rgba(246,241,230,0.02));
}

.report-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
}

.ticker {
  font-family: var(--font-sans);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--cream-200);
  padding: 4px 10px;
  border: 1px solid var(--line-strong);
  border-radius: 6px;
  font-weight: 600;
}

.tag {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 4px 10px;
  border-radius: 999px;
}
.tag-long  { color: var(--green-900); background: var(--long); }
.tag-short { color: var(--green-900); background: var(--short); }

.report h3 {
  font-family: var(--font-serif);
  font-size: 26px;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0 0 6px;
  color: var(--cream-50);
}

.report .meta {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
  margin: 0 0 16px;
}

.report .thesis {
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--cream-100);
  margin: 0 0 22px;
  flex: 1;
}

.report-link {
  font-size: 13px;
  font-weight: 500;
  color: var(--accent);
  letter-spacing: 0.02em;
  align-self: flex-start;
  transition: gap .2s ease, color .2s ease;
}
.report-link:hover { color: var(--cream-50); }

.report-link.is-pending {
  color: var(--muted);
  font-style: italic;
  cursor: default;
}
.report-link.is-pending:hover { color: var(--muted); }

.report.is-hidden { display: none; }

/* ---------- Pull Quote ---------- */

.quote {
  background: linear-gradient(180deg, var(--green-900), var(--green-800));
  text-align: center;
  padding-top: 80px;
  padding-bottom: 80px;
}
.quote blockquote {
  margin: 0;
  max-width: 900px;
  margin-inline: auto;
}
.quote p {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: clamp(24px, 3.4vw, 40px);
  line-height: 1.25;
  color: var(--cream-50);
  margin: 0 0 20px;
}
.quote footer {
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent);
}

/* ---------- Contact ---------- */

.contact { background: var(--green-800); }

.contact-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}

.contact-list {
  list-style: none;
  padding: 0;
  margin: 36px 0 0;
  display: grid;
  gap: 18px;
}
.contact-list li {
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: 16px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line);
  font-size: 15px;
}
.contact-label {
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--muted);
  align-self: center;
}
.contact-list a:hover { color: var(--accent); }

.contact-form {
  background: var(--green-900);
  padding: 36px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
  display: grid;
  gap: 20px;
}

.field { display: grid; gap: 8px; }
.field label {
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cream-200);
  font-weight: 500;
}
.field .hint { color: var(--muted); text-transform: none; letter-spacing: 0; font-size: 12px; }

.field input,
.field textarea {
  width: 100%;
  padding: 14px 16px;
  background: rgba(246, 241, 230, 0.04);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  color: var(--cream-50);
  font-family: inherit;
  font-size: 15px;
  line-height: 1.5;
  transition: border-color .2s ease, background .2s ease, box-shadow .2s ease;
}
.field input:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--cream-200);
  background: rgba(246, 241, 230, 0.08);
  box-shadow: 0 0 0 4px rgba(201, 169, 106, 0.15);
}
.field textarea { resize: vertical; min-height: 120px; }

.form-status {
  margin: 0;
  min-height: 1em;
  font-size: 13px;
  color: var(--long);
}
.form-status.is-error { color: var(--short); }

/* ---------- Footer ---------- */

.site-footer {
  padding: 48px 0 36px;
  background: var(--green-900);
  border-top: 1px solid var(--line);
}

.footer-inner {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 24px;
  row-gap: 16px;
}

.footer-brand {
  display: flex; align-items: center; gap: 14px;
}
.footer-name {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 600;
  color: var(--cream-50);
}
.footer-tag {
  margin: 0;
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0.06em;
}

.footer-nav {
  display: inline-flex;
  gap: 22px;
}
.footer-nav a {
  font-size: 13px;
  color: var(--cream-100);
  transition: color .2s ease;
}
.footer-nav a:hover { color: var(--cream-50); }

.footer-legal {
  grid-column: 1 / -1;
  margin: 8px 0 0;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0.04em;
}

/* ---------- Reveal animation ---------- */

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .7s ease, transform .7s ease;
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; }
}

/* ---------- Responsive ---------- */

@media (max-width: 880px) {
  .hero-stats { grid-template-columns: repeat(2, 1fr); row-gap: 26px; }
  .hero-stats > div:nth-child(3) { border-left: none; padding-left: 0; }
  .contact-inner { grid-template-columns: 1fr; gap: 40px; }
}

@media (max-width: 720px) {
  .menu-toggle { display: inline-flex; align-items: center; justify-content: center; }
  .primary-nav {
    position: fixed;
    inset: 64px var(--pad) auto var(--pad);
    background: var(--green-800);
    border: 1px solid var(--line-strong);
    border-radius: var(--radius);
    padding: 14px;
    box-shadow: var(--shadow-soft);
    transform-origin: top right;
    transform: scale(0.96);
    opacity: 0;
    pointer-events: none;
    transition: opacity .2s ease, transform .2s ease;
  }
  .primary-nav.is-open {
    opacity: 1;
    transform: scale(1);
    pointer-events: auto;
  }
  .primary-nav ul { flex-direction: column; gap: 4px; }
  .nav-link { display: block; padding: 12px 14px; }

  .hero { padding-top: 130px; padding-bottom: 80px; }
  .hero-actions { gap: 10px; }
  .btn { padding: 12px 20px; }

  .footer-inner { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .brand-text { display: none; }
  .research-head { align-items: start; }
}