/* =============================================================
   Sapling Fertilizer — Site styles
   Design spec: ../DESIGN-SPEC.md
   ============================================================= */

:root {
  --orange: #E9530D;
  --orange-hover: #D14A0B;
  --orange-light: #FEF0E8;
  --dark: #3C3C3B;
  --mid: #727271;
  --bg: #FFFFFF;
  --bg-alt: #F7F7F5;
  --border: #E5E5E3;

  --container: 1200px;
  --pad: 24px;
  --radius: 8px;
  --radius-lg: 12px;

  --shadow-nav: 0 2px 12px rgba(60, 60, 59, 0.08);

  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

/* ---------- Reset / base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  font-weight: 400;
  font-size: 17px;
  line-height: 1.6;
  color: var(--mid);
  background: var(--bg);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

h1, h2, h3, h4 {
  color: var(--dark);
  font-weight: 500;
  line-height: 1.2;
  margin: 0 0 16px;
}
h1 { font-size: clamp(36px, 5vw, 54px); line-height: 1.1; }
h2 { font-size: clamp(28px, 3.5vw, 36px); }
h3 { font-size: 22px; }
h4 { font-size: 18px; }

p { margin: 0 0 16px; }
a { color: var(--orange); text-decoration: none; }
a:hover { color: var(--orange-hover); }

ul { margin: 0 0 16px; padding-left: 20px; }
li { margin-bottom: 8px; }

/* ---------- Layout ---------- */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding-left: var(--pad);
  padding-right: var(--pad);
}

.section {
  padding: 88px 0;
}
.section--alt { background: var(--bg-alt); }
.section--dark { background: var(--dark); color: #fff; }

@media (max-width: 768px) {
  .section { padding: 56px 0; }
}

/* ---------- Tags / labels ---------- */
.tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--orange);
  margin-bottom: 14px;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  font-family: inherit;
  font-size: 15px;
  font-weight: 500;
  padding: 14px 28px;
  border-radius: 6px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 0.18s ease, color 0.18s ease, border-color 0.18s ease;
  text-align: center;
  line-height: 1;
}
.btn--primary {
  background: var(--orange);
  color: #fff;
  border-color: var(--orange);
}
.btn--primary:hover { background: var(--orange-hover); border-color: var(--orange-hover); color: #fff; }
.btn--secondary {
  background: transparent;
  color: var(--orange);
  border-color: var(--orange);
}
.btn--secondary:hover { background: var(--orange-light); color: var(--orange); }
.btn--small { padding: 10px 18px; font-size: 14px; }

.btn-row { display: flex; gap: 12px; flex-wrap: wrap; }

.text-link {
  display: inline-block;
  margin-top: 8px;
  font-weight: 500;
  font-size: 15px;
}

/* ---------- Navigation ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: saturate(180%) blur(8px);
  -webkit-backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow 0.2s ease;
}
.nav.is-scrolled { box-shadow: var(--shadow-nav); }
.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 84px;
  gap: 24px;
}
.nav__logo { display: flex; align-items: center; }
.nav__logo img { height: 44px; width: auto; }
.nav__links {
  display: flex;
  gap: 28px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav__links a {
  color: var(--dark);
  font-size: 15px;
  font-weight: 400;
  padding: 6px 0;
  border-bottom: 2px solid transparent;
  transition: color 0.15s, border-color 0.15s;
}
.nav__links a:hover,
.nav__links a.active {
  color: var(--orange);
  border-bottom-color: var(--orange);
}
.nav__cta { display: flex; align-items: center; }

.nav__toggle {
  display: none;
  background: none;
  border: 0;
  cursor: pointer;
  padding: 8px;
  margin-right: -8px;
}
.nav__toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--dark);
  margin: 5px 0;
  transition: transform 0.2s, opacity 0.2s;
}
.nav.is-open .nav__toggle span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav.is-open .nav__toggle span:nth-child(2) { opacity: 0; }
.nav.is-open .nav__toggle span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 900px) {
  .nav__links, .nav__cta { display: none; }
  .nav__toggle { display: block; }
  /* When the menu is open, force the entire nav to a solid white panel so the
     stacked links don't bleed through to whatever is behind. */
  .nav.is-open {
    background: #fff;
    box-shadow: var(--shadow-nav);
  }
  .nav.is-open .nav__inner {
    flex-wrap: wrap;
  }
  .nav.is-open .nav__links {
    display: flex;
    flex-direction: column;
    width: 100%;
    gap: 0;
    padding: 8px 0 16px;
    border-top: 1px solid var(--border);
    background: #fff;
  }
  .nav.is-open .nav__links a {
    padding: 14px 4px;
    border-bottom: 1px solid var(--border);
    width: 100%;
    color: var(--dark);
    font-weight: 500;
  }
  .nav.is-open .nav__cta {
    display: flex;
    width: 100%;
    padding-bottom: 16px;
    background: #fff;
  }
  .nav.is-open .nav__cta .btn { width: 100%; }
}

/* ---------- Hero (full-bleed split) ---------- */
.hero {
  background: #fff;
  border-bottom: 1px solid var(--border);
}
.hero__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: stretch;
  min-height: 580px;
}
.hero__text {
  display: flex;
  align-items: center;
  /* Left padding aligns with .container left edge; right pad gives breathing room. */
  padding: 96px 64px 96px max(24px, calc((100vw - 1200px) / 2));
}
.hero__text-inner { max-width: 540px; }
.hero__lead {
  font-size: 19px;
  color: var(--mid);
  margin-bottom: 28px;
}
.hero__media {
  position: relative;
  background: var(--bg-alt);
  overflow: hidden;
}
.hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

@media (max-width: 900px) {
  .hero__grid { grid-template-columns: 1fr; min-height: 0; }
  .hero__text { padding: 56px 24px 32px; }
  .hero__media { height: 320px; }
}

/* ---------- Stats bar ---------- */
.stats {
  background: var(--bg-alt);
  padding: 48px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.stats__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}
.stat__title {
  color: var(--dark);
  font-size: 18px;
  font-weight: 500;
  margin-bottom: 6px;
}
.stat__body {
  font-size: 15px;
  margin: 0;
}
@media (max-width: 768px) {
  .stats__grid { grid-template-columns: 1fr; gap: 24px; }
}

/* ---------- Section header ---------- */
.section__header {
  max-width: 720px;
  margin-bottom: 48px;
}
.section__header--center {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}
.section__header p { font-size: 17px; }

/* ---------- Two column block ---------- */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 72px;
  align-items: center;
}
/* Pattern: always put text first, image (.split__media) second in markup.
   .split           = image on RIGHT, offset block bleeds off right page edge
   .split--reverse  = image on LEFT, offset block bleeds off left page edge */
.split--reverse .split__media { order: -1; }
.split__media {
  position: relative;
  aspect-ratio: 4 / 3;
  background: var(--bg-alt);
}
/* Offset accent block — sits behind image, peeks out one corner away from text */
.split__media::before {
  content: "";
  position: absolute;
  inset: 20px -20px -20px 20px;      /* down-right (image on right) */
  background: var(--orange-light);
  z-index: 0;
}
.split--reverse .split__media::before {
  inset: 20px 20px -20px -20px;      /* down-left (image on left) */
}
/* Opt out of the accent block — for product shots on white backgrounds, etc. */
.split__media--plain::before { display: none; }
.split__media img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
@media (max-width: 900px) {
  .split { grid-template-columns: 1fr; gap: 48px; }
  .split--reverse .split__media { order: 0; }
  .split__media::before,
  .split--reverse .split__media::before {
    inset: 16px -16px -16px 16px;
  }
}

/* ---------- Cards ---------- */
.cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.cards--3 { grid-template-columns: repeat(3, 1fr); }
.cards--4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 900px) {
  .cards, .cards--3, .cards--4 { grid-template-columns: 1fr; }
}
@media (min-width: 768px) and (max-width: 1199px) {
  .cards--3, .cards--4 { grid-template-columns: repeat(2, 1fr); }
}

.card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  display: flex;
  flex-direction: column;
}
.card--alt { background: var(--bg-alt); }
.card__tag {
  font-size: 12px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--orange);
  font-weight: 500;
  margin-bottom: 12px;
}

/* Reference card — used on Research page for studies/news/academic links */
.ref-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  flex-direction: column;
}
.ref-card__type {
  display: inline-block;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 1.4px;
  text-transform: uppercase;
  color: var(--orange);
  background: var(--orange-light);
  padding: 4px 10px;
  border-radius: 4px;
  margin-bottom: 16px;
  align-self: flex-start;
}
.ref-card h3 {
  font-size: 18px;
  margin-bottom: 10px;
  line-height: 1.35;
}
.ref-card p {
  font-size: 15px;
  margin-bottom: 16px;
}
.ref-card__source {
  font-size: 13px;
  color: var(--mid);
  margin-top: auto;
  margin-bottom: 12px;
}
.ref-card .text-link { margin-top: 0; font-size: 14px; }
.card h3 { margin-bottom: 12px; }
.card p { margin-bottom: 20px; }
.card .text-link { margin-top: auto; }

/* ---------- Feature list ---------- */
.features {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px 56px;
}
.features--4 { grid-template-columns: repeat(4, 1fr); gap: 32px; }
.feature h4 {
  margin-bottom: 8px;
  font-size: 18px;
}
.feature p { margin-bottom: 0; font-size: 16px; }
@media (max-width: 1100px) {
  .features--4 { grid-template-columns: repeat(2, 1fr); gap: 28px; }
}
@media (max-width: 768px) {
  .features { grid-template-columns: 1fr; gap: 28px; }
  .features--4 { grid-template-columns: 1fr; }
}

/* ---------- Disambiguation callout ---------- */
.callout {
  background: var(--orange-light);
  border-left: 4px solid var(--orange);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 24px 28px;
  margin: 40px 0 0;
}
.callout strong {
  display: block;
  color: var(--dark);
  font-weight: 500;
  font-size: 18px;
  margin-bottom: 8px;
}
.callout p {
  margin: 0;
  font-size: 16px;
}

/* ---------- CTA band ---------- */
.cta-band {
  background: var(--bg-alt);
  padding: 72px 0;
  text-align: center;
}
.cta-band h2 { margin-bottom: 12px; }
.cta-band p {
  max-width: 620px;
  margin: 0 auto 28px;
  font-size: 17px;
}

/* ---------- Footer ---------- */
.footer {
  background: var(--dark);
  color: #d8d8d6;
  padding: 64px 0 32px;
}
.footer__grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}
.footer__brand { max-width: 320px; }
.footer__logo {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}
.footer__logo img { height: 44px; width: auto; }
.footer__logo .footer__brand-name {
  color: #fff;
  font-weight: 500;
  font-size: 18px;
  letter-spacing: 0.2px;
}
.footer__tag { font-size: 14px; color: #b3b3b1; margin: 0; }
.footer h4 {
  color: #fff;
  font-size: 14px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  margin-bottom: 16px;
}
.footer ul { list-style: none; padding: 0; margin: 0; }
.footer li { margin-bottom: 10px; }
.footer a {
  color: #d8d8d6;
  font-size: 15px;
  transition: color 0.15s;
}
.footer a:hover { color: var(--orange); }
.footer__bottom {
  border-top: 1px solid #555;
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 13px;
  color: #a8a8a6;
}
@media (max-width: 768px) {
  .footer__grid { grid-template-columns: 1fr; gap: 32px; }
}

/* ---------- Forms ---------- */
.form {
  display: grid;
  gap: 20px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px;
}
.form__row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
@media (max-width: 600px) {
  .form { padding: 28px 22px; }
  .form__row { grid-template-columns: 1fr; }
}
.form__field { display: flex; flex-direction: column; }
.form__field label {
  font-size: 14px;
  color: var(--dark);
  font-weight: 500;
  margin-bottom: 8px;
}
.form__field input,
.form__field select,
.form__field textarea {
  font-family: inherit;
  font-size: 15px;
  color: var(--dark);
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #fff;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.form__field input:focus,
.form__field select:focus,
.form__field textarea:focus {
  outline: none;
  border-color: var(--orange);
  box-shadow: 0 0 0 3px var(--orange-light);
}
.form__field textarea { resize: vertical; min-height: 120px; }
.form__field .req { color: var(--orange); margin-left: 2px; }

.form__submit { display: flex; justify-content: flex-end; }

/* Honeypot — hide visually + from assistive tech, but stay in the DOM so bots
   that fill every field still trigger it. */
.hp-field {
  position: absolute;
  left: -10000px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.form__error {
  margin: 0;
  padding: 12px 16px;
  background: #FEE7E0;
  border: 1px solid #E9530D;
  border-radius: 6px;
  color: #B03B05;
  font-size: 14px;
}

.form-success {
  background: var(--orange-light);
  border: 1px solid var(--orange);
  border-radius: var(--radius-lg);
  padding: 32px;
  text-align: center;
}
.form-success h3 { color: var(--dark); margin-bottom: 8px; }
.form-success .btn-row { justify-content: center; margin-top: 20px; }

/* ---------- Contact aside ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 48px;
  align-items: start;
}
.contact-info {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
}
.contact-info h3 { font-size: 20px; margin-bottom: 8px; }
.contact-info__item { margin-bottom: 20px; }
.contact-info__item:last-child { margin-bottom: 0; }
.contact-info__label {
  font-size: 12px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--orange);
  font-weight: 500;
  margin-bottom: 4px;
}
.contact-info a { font-size: 16px; }

@media (max-width: 900px) {
  .contact-grid { grid-template-columns: 1fr; gap: 32px; }
}

/* ---------- Utility ---------- */
.hidden { display: none !important; }
.center { text-align: center; }
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }