/**
 * Homepage sections — V3 "Sylva Ethos" design system.
 *
 * Monastic Naturalism: editorial, sharp-edged, tonal layering.
 * Polish pass: stronger hierarchy, generous spacing, premium feel.
 */

/* ── Hero ──────────────────────────────────────────────────────────── */

.btc-hero {
  position: relative;
  min-height: 100vh;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background-size: cover;
  background-position: center;
  background-color: var(--btc-primary);
  overflow: hidden;
}

.btc-hero__overlay {
  position: absolute;
  inset: 0;
  background: rgba(2, 18, 4, 0.45);
  z-index: 1;
}

.btc-hero__content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 800px;
  padding: 2rem;
}

.btc-hero__title {
  font-family: var(--btc-font-serif);
  color: white;
  font-size: clamp(3rem, 6vw, 5.5rem);
  font-weight: 400;
  font-style: italic;
  line-height: 1.1;
  margin-bottom: 4.5rem;
  letter-spacing: -0.01em;
}

.btc-hero__btn {
  display: inline-block;
  font-family: var(--btc-font-sans);
  text-transform: uppercase;
  letter-spacing: 0.25em;
  padding: 1.1rem 3rem;
  background: white;
  color: var(--btc-primary);
  font-size: 0.75rem;
  transition: all 0.3s;
}
.btc-hero__btn:hover {
  background: var(--btc-secondary);
  color: white;
}

/* ── Intro Section ─────────────────────────────────────────────────── */

.btc-intro {
  background: var(--btc-surface);
  padding: 12rem 2rem;
  text-align: center;
}

.btc-intro__inner {
  max-width: 620px;
  margin: 0 auto;
}

.btc-intro__title {
  font-family: var(--btc-font-serif);
  font-size: clamp(2.4rem, 4.5vw, 4rem);
  font-weight: 400;
  color: var(--btc-primary);
  line-height: 1.12;
  margin-bottom: 3rem;
}

.btc-intro__text {
  font-family: var(--btc-font-serif);
  font-size: 1.15rem;
  font-weight: 300;
  font-style: italic;
  line-height: 1.85;
  color: var(--btc-on-surface-muted);
  margin-bottom: 3.5rem;
  max-width: 540px;
  margin-left: auto;
  margin-right: auto;
}

.btc-intro__btn {
  display: inline-block;
  font-family: var(--btc-font-sans);
  text-transform: uppercase;
  letter-spacing: 0.25em;
  padding: 0.9rem 2.5rem;
  border: 1px solid var(--btc-primary);
  color: var(--btc-primary);
  font-size: 0.7rem;
  transition: all 0.3s;
}
.btc-intro__btn:hover {
  background: var(--btc-primary);
  color: white;
}

/* ── Three Icons Section ───────────────────────────────────────────── */

.btc-icons {
  background: var(--btc-surface-container);
  padding: 10rem 2rem;
}

.btc-icons__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 7rem;
  max-width: 1100px;
  margin: 0 auto;
  text-align: center;
}

.btc-icon-item {
  padding: 0 1.5rem;
}

.btc-icon-item__symbol {
  font-size: 1.8rem;
  color: var(--btc-secondary);
  margin-bottom: 2.5rem;
  opacity: 0.65;
}
.btc-icon-item__symbol.material-symbols-outlined {
  font-size: inherit;
  color: inherit;
}

.btc-icon-item__title {
  font-family: var(--btc-font-sans);
  text-transform: uppercase;
  letter-spacing: 0.25em;
  font-size: 0.7rem;
  color: var(--btc-primary);
  margin-bottom: 1.5rem;
}

.btc-icon-item__text {
  font-family: var(--btc-font-serif);
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--btc-on-surface-muted);
}

@media (max-width: 768px) {
  .btc-icons__grid {
    grid-template-columns: 1fr;
    gap: 4rem;
    max-width: 400px;
  }
}

/* ── Quote Strip — styles moved to btc-shortcodes.css (always loaded) */

/* ── NBI — Nature Based Interventions (4 columns) ──────────────────── */

.btc-nbi {
  background: var(--btc-surface);
  padding: 12rem 2rem;
}

.btc-nbi__header {
  max-width: 1280px;
  margin: 0 auto 6rem;
}

.btc-nbi__title {
  font-family: var(--btc-font-serif);
  font-size: clamp(2.2rem, 3.8vw, 3.5rem);
  font-weight: 400;
  color: var(--btc-primary);
  line-height: 1.12;
}

.btc-nbi__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 3.5rem;
  max-width: 1280px;
  margin: 0 auto;
}

.btc-nbi-card {
  display: flex;
  flex-direction: column;
}

.btc-nbi-card__image {
  width: 100%;
  aspect-ratio: 3 / 4;
  background-size: cover;
  background-position: center;
  margin-bottom: 2rem;
  filter: grayscale(20%);
  transition: filter 0.7s;
}
.btc-nbi-card:hover .btc-nbi-card__image {
  filter: grayscale(0%);
}
.btc-nbi-card__image--placeholder {
  background-color: var(--btc-surface-container-high);
}

.btc-nbi-card__title {
  font-family: var(--btc-font-serif);
  font-size: 1.7rem;
  font-style: italic;
  font-weight: 400;
  color: var(--btc-primary);
  margin-bottom: 1rem;
  line-height: 1.2;
}

.btc-nbi-card__text {
  font-family: var(--btc-font-serif);
  font-size: 1rem;
  line-height: 1.75;
  color: var(--btc-on-surface-muted);
  margin-bottom: 2.5rem;
}

.btc-nbi-card__link,
.btc-nbi-card__btn {
  font-family: var(--btc-font-sans);
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-size: 0.65rem;
  color: var(--btc-secondary);
  border-bottom: 1px solid var(--btc-secondary);
  padding-bottom: 3px;
  width: fit-content;
  margin-top: auto;
  transition: color 0.2s, border-color 0.2s;
}
.btc-nbi-card__link:hover,
.btc-nbi-card__btn:hover {
  color: var(--btc-primary);
  border-color: var(--btc-primary);
}

@media (max-width: 992px) {
  .btc-nbi__grid { grid-template-columns: repeat(2, 1fr); gap: 3rem; }
}
@media (max-width: 600px) {
  .btc-nbi__grid { grid-template-columns: 1fr; max-width: 500px; }
}

/* ── Training Section (50/50 edge-to-edge) ─────────────────────────── */

.btc-training {
  background: var(--btc-surface-container);
  padding: 0;
}

.btc-training__inner {
  display: flex;
  align-items: stretch;
  min-height: 700px;
}

.btc-training__image-wrap {
  flex: 0 0 50%;
}

.btc-training__image {
  width: 100%;
  height: 100%;
  min-height: 500px;
  background-size: cover;
  background-position: center;
  filter: grayscale(15%);
  transition: filter 0.7s;
}
.btc-training:hover .btc-training__image {
  filter: grayscale(0%);
}
.btc-training__image--placeholder {
  background-color: var(--btc-surface-container-high);
}

.btc-training__body {
  flex: 0 0 50%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 7rem 8rem;
  background: var(--btc-surface);
}

.btc-training__title {
  font-family: var(--btc-font-serif);
  font-size: clamp(2rem, 3vw, 3rem);
  font-weight: 400;
  font-style: italic;
  color: var(--btc-primary);
  margin-bottom: 2.5rem;
  line-height: 1.12;
}

.btc-training__text {
  font-family: var(--btc-font-serif);
  font-size: 1.1rem;
  line-height: 1.8;
  color: var(--btc-on-surface-muted);
  margin-bottom: 3rem;
}

.btc-training__btn {
  display: inline-block;
  font-family: var(--btc-font-sans);
  text-transform: uppercase;
  letter-spacing: 0.25em;
  padding: 1rem 2.5rem;
  background: var(--btc-primary);
  color: white;
  font-size: 0.7rem;
  align-self: flex-start;
  transition: background 0.3s;
}
.btc-training__btn:hover {
  background: var(--btc-secondary);
  color: white;
}

@media (max-width: 768px) {
  .btc-training__inner { flex-direction: column; min-height: auto; }
  .btc-training__image-wrap { flex: none; }
  .btc-training__image { min-height: 350px; }
  .btc-training__body { flex: none; padding: 4rem 2rem; }
}

/* ── Free Offer Strip ──────────────────────────────────────────────── */

.btc-free-offer {
  background: var(--btc-secondary);
  padding: 8rem 2rem;
  text-align: center;
}

.btc-free-offer__inner {
  max-width: 680px;
  margin: 0 auto;
}

.btc-free-offer__overline {
  font-family: var(--btc-font-sans);
  text-transform: uppercase;
  letter-spacing: 0.25em;
  font-size: 0.65rem;
  color: rgba(255, 255, 255, 0.7);
  display: block;
  margin-bottom: 1.25rem;
}

.btc-free-offer__title {
  font-family: var(--btc-font-serif);
  font-size: clamp(2rem, 3.8vw, 3.2rem);
  font-weight: 400;
  font-style: italic;
  color: white;
  margin-bottom: 2rem;
  line-height: 1.12;
}

.btc-free-offer__text {
  font-family: var(--btc-font-serif);
  font-size: 1.1rem;
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: 3.5rem;
}

.btc-free-offer__btn {
  display: inline-block;
  font-family: var(--btc-font-sans);
  text-transform: uppercase;
  letter-spacing: 0.25em;
  padding: 1rem 3rem;
  background: var(--btc-primary);
  color: white;
  font-size: 0.7rem;
  transition: all 0.3s;
}
.btc-free-offer__btn:hover {
  background: white;
  color: var(--btc-primary);
}

/* ── Science Preview (50/50 reversed) ──────────────────────────────── */

.btc-science-preview {
  background: var(--btc-surface);
  padding: 0;
}

.btc-science-preview__inner {
  display: flex;
  align-items: stretch;
  flex-direction: row-reverse;
  min-height: 700px;
}

.btc-science-preview__image-wrap {
  flex: 0 0 50%;
}

.btc-science-preview__image {
  width: 100%;
  height: 100%;
  min-height: 500px;
  background-size: cover;
  background-position: center;
  filter: grayscale(15%);
  transition: filter 0.7s;
}
.btc-science-preview:hover .btc-science-preview__image {
  filter: grayscale(0%);
}
.btc-science-preview__image--placeholder {
  background-color: var(--btc-surface-container-high);
}

.btc-science-preview__body {
  flex: 0 0 50%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 7rem 8rem;
  background: var(--btc-surface-container);
}

.btc-science-preview__title {
  font-family: var(--btc-font-serif);
  font-size: clamp(2rem, 3vw, 3rem);
  font-weight: 400;
  font-style: italic;
  color: var(--btc-primary);
  margin-bottom: 2.5rem;
  line-height: 1.12;
}

.btc-science-preview__text {
  font-family: var(--btc-font-serif);
  font-size: 1.1rem;
  line-height: 1.8;
  color: var(--btc-on-surface-muted);
  margin-bottom: 3rem;
}

.btc-science-preview__btn {
  display: inline-block;
  font-family: var(--btc-font-sans);
  text-transform: uppercase;
  letter-spacing: 0.25em;
  padding: 1rem 2.5rem;
  border: 1px solid var(--btc-primary);
  color: var(--btc-primary);
  font-size: 0.7rem;
  align-self: flex-start;
  transition: all 0.3s;
}
.btc-science-preview__btn:hover {
  background: var(--btc-primary);
  color: white;
}

@media (max-width: 768px) {
  .btc-science-preview__inner { flex-direction: column; min-height: auto; }
  .btc-science-preview__image-wrap { flex: none; }
  .btc-science-preview__image { min-height: 350px; }
  .btc-science-preview__body { flex: none; padding: 4rem 2rem; }
}

/* ── Testimonials section wrapper (card styles in btc-shortcodes.css) */

.btc-reviews-section {
  background: var(--btc-surface);
  padding: 6rem 2rem;
}

.btc-reviews-section__header {
  font-family: var(--btc-font-sans);
  text-transform: uppercase;
  letter-spacing: 0.3em;
  text-align: center;
  font-size: 1rem;
  color: var(--btc-on-surface-faint);
  margin-bottom: 3rem;
}

/* Footer styles in btc-global.css (loads on all pages) */