/* Theme 4 — Expanding accordion photo panels */

.t4-page {
  min-height: 100dvh;
  background:
    radial-gradient(circle at 50% -12%, color-mix(in srgb, var(--accent) 22%, transparent), transparent 34%),
    linear-gradient(180deg, var(--bg), var(--bg-2));
  color: var(--ink);
  overflow-x: hidden;
}

.t4-shell {
  width: min(1180px, calc(100% - 36px));
  min-height: 100dvh;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
}

/* ── Header ── */

.t4-header {
  position: sticky;
  top: 14px;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 22px;
  margin-top: 14px;
  padding: 13px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--header-bg) 82%, transparent);
  color: var(--header-text);
  box-shadow: var(--shadow-soft);
  backdrop-filter: blur(16px);
}

.t4-brand {
  color: var(--header-text);
  font-size: 0.96rem;
  font-weight: 850;
  letter-spacing: 0;
  text-decoration: none;
}

.t4-nav {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.t4-nav a {
  color: color-mix(in srgb, var(--header-text) 68%, transparent);
  font-size: 0.82rem;
  font-weight: 700;
  text-decoration: none;
}

.t4-nav a:hover,
.t4-nav a:focus-visible {
  color: var(--header-text);
}

/* ── Hero layout ── */

.t4-hero {
  flex: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  align-content: start;
  row-gap: 0;
  padding: clamp(18px, 3vh, 36px) 0 34px;
}

.t4-hero__intro {
  position: relative;
  z-index: 5;
  width: 100%;
  max-width: none;
  margin: 0;
  text-align: center;
  pointer-events: none;
  padding-bottom: clamp(18px, 3vw, 34px);
}

.t4-hero h1 {
  position: relative;
  left: 50%;
  width: calc(100vw - 24px);
  max-width: 1280px;
  transform: translateX(-50%);
  margin: 0;
  color: var(--hero-text);
  font-family: var(--hero-font, inherit);
  font-size: clamp(2.2rem, 5.5vw, 5.1rem);
  font-weight: 950;
  line-height: 0.96;
  letter-spacing: 0;
  white-space: nowrap;
  text-wrap: normal;
}

.t4-hero h1 .h1c {
  display: inline-block;
  transition: transform 0.3s cubic-bezier(0.23, 1, 0.32, 1);
}

.t4-hero h1 .h1c:hover {
  transform: translateY(-18px);
}

/* ── Stage ── */

.t4-stage {
  --collapsed: clamp(82px, 8vw, 145px);
  --expanded:  clamp(220px, 28vw, 340px);
  position: relative;
  z-index: 1;
  width: min(100%, 1060px);
  margin: clamp(12px, 2vw, 28px) auto 0;
  height: clamp(360px, 44vw, 520px);
  display: flex;
  justify-content: center;
  gap: 10px;
  padding: 0;
  box-sizing: border-box;
  overflow: visible;
}

/* ── Panels ── */

.t4-panel {
  flex: 0 0 var(--collapsed);
  border-radius: 0.5rem;
  background-image: var(--img);
  background-size: cover;
  background-position: center;
  background-color: color-mix(in srgb, var(--accent) 18%, #111);
  box-shadow: 1px 5px 18px rgba(0, 0, 0, 0.45);
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: flex 0.5s ease-in-out, box-shadow 0.5s ease-in-out, transform 0.5s ease-in-out;
}

.t4-panel:hover {
  flex: 0 0 var(--expanded);
  box-shadow: 1px 3px 28px color-mix(in srgb, var(--accent) 55%, transparent);
  transform: translateY(-30px);
}

/* ── Panel text overlay ── */

.t4-panel__content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: flex-end;
  padding: 20px;
  height: 100%;
  background: linear-gradient(0deg, rgba(0, 0, 0, 0.68) 0%, transparent 100%);
  color: #fff;
  opacity: 0;
  transform: translateY(100%);
  visibility: hidden;
  transition: opacity 0.5s ease-in-out, transform 0.5s 0.2s ease-in-out;
}

.t4-panel:hover .t4-panel__content {
  opacity: 1;
  transform: translateY(0);
  visibility: visible;
}

.t4-panel__content h2 {
  margin: 0 0 5px;
  font-size: clamp(1.05rem, 1.8vw, 1.45rem);
  font-weight: 750;
  line-height: 1.2;
}

.t4-panel__content span {
  display: block;
  font-size: clamp(0.8rem, 1.3vw, 1.05rem);
  opacity: 0.8;
}

.t4-panel--empty {
  background-image:
    linear-gradient(135deg, color-mix(in srgb, var(--accent) 26%, transparent), color-mix(in srgb, var(--accent-2) 18%, transparent)),
    linear-gradient(180deg, var(--bg-2), var(--bg));
}

/* ── Description + CTA ── */

.t4-description {
  display: grid;
  justify-items: center;
  gap: 16px;
  max-width: 720px;
  margin: clamp(44px, 6vw, 64px) auto 0;
  text-align: center;
}

.t4-description p {
  margin: 0;
  color: var(--muted);
  font-size: clamp(1rem, 2.2vw, 1.22rem);
  line-height: 1.7;
  text-wrap: balance;
}

.t4-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 24px;
  border: 1px solid color-mix(in srgb, var(--button-bg) 72%, var(--line));
  border-radius: 999px;
  background: var(--button-bg);
  color: var(--button-text);
  font-size: 0.88rem;
  font-weight: 820;
  text-decoration: none;
  box-shadow: 0 12px 28px color-mix(in srgb, var(--button-bg) 24%, transparent);
}

.t4-cta:hover,
.t4-cta:focus-visible {
  transform: translateY(-1px);
}

/* ── Footer ── */

.t4-page .site-footer {
  margin-top: auto;
  border-top: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
}

.t4-page .site-footer a {
  color: var(--muted);
}

.t4-page .site-footer a:hover {
  color: var(--ink);
}

/* ── Mobile ── */

@media (max-width: 720px) {
  .t4-shell {
    width: min(100% - 24px, 1180px);
  }

  .t4-header {
    position: static;
    align-items: flex-start;
    flex-direction: column;
    border-radius: var(--radius);
  }

  .t4-nav {
    justify-content: flex-start;
    gap: 14px;
  }

  .t4-hero {
    padding-top: 28px;
  }

  .t4-hero__intro {
    width: 100%;
    margin: 0;
  }

  .t4-hero h1 {
    font-size: clamp(2.05rem, 12vw, 4.4rem);
    white-space: normal;
  }

  .t4-stage {
    --collapsed: clamp(48px, 10vw, 82px);
    --expanded:  clamp(160px, 36vw, 240px);
    height: clamp(260px, 52vw, 360px);
    gap: 6px;
    padding: 0 6px;
    margin-top: 14px;
  }

  .t4-panel:hover {
    transform: translateY(-16px);
  }

  .t4-description {
    margin-top: clamp(30px, 5vw, 44px);
  }
}