/* ============================================
   Slide layouts
   Each slide is a <section class="slide ..."> injected
   into #slide-container. Layout variants below.
   ============================================ */

.slide {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: var(--space-12) var(--space-20);
  width: 100%;
  max-width: 1400px;
  margin-inline: auto;
  animation: slide-enter var(--duration-medium) var(--ease-out);
  max-height: 100%;    /* fit within slide-stage */
  overflow: hidden;    /* don't grow beyond stage */
  min-height: 0;       /* allow flex shrink */
}

@keyframes slide-enter {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Slide header (eyebrow + title block) */
.slide__header {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-block-end: var(--space-8);
}
.slide__eyebrow {
  display: inline-block;
  font-size: var(--text-small);
  font-weight: 600;
  color: var(--chapter-accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}
.slide__title {
  font-size: var(--text-h1);
  font-weight: 600;
  color: var(--ink-900);
}
.slide__subtitle {
  font-size: var(--text-h2);
  color: var(--slate-500);
  font-family: var(--font-body);
  font-weight: 400;
  max-width: 60ch;
}
.slide__subtitle strong {
  color: var(--ink-900);
  font-weight: 700;
}

.slide__body {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
  min-height: 0;
  /* Scroll inside the body when content overflows the stage */
  overflow-y: auto;
  overflow-x: hidden;
  scrollbar-width: thin;
  scrollbar-color: var(--slate-300) transparent;
  scrollbar-gutter: stable;
}
.slide__body::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
.slide__body::-webkit-scrollbar-track {
  background: transparent;
}
.slide__body::-webkit-scrollbar-thumb {
  background: var(--slate-300);
  border-radius: 3px;
}
.slide__body::-webkit-scrollbar-thumb:hover {
  background: var(--slate-500);
}

.slide__caption {
  font-size: var(--text-small);
  color: var(--slate-500);
  margin-block-start: var(--space-4);
}

/* ============================================
   Slide variants
   ============================================ */

/* ----- COVER ----- */
.slide--cover {
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: var(--space-12);
  background:
    radial-gradient(ellipse at 70% 20%, rgba(22,217,168,0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 20% 80%, rgba(35,100,226,0.06) 0%, transparent 50%),
    var(--surface-50);
}
.slide--cover .cover__brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-8);
  padding-block-end: var(--space-8);
  border-block-end: 1px solid var(--border-soft);
}
.slide--cover .cover__brand img.solugen { height: 56px; }
.slide--cover .cover__brand img.tmura   { height: 64px; }
.slide--cover .cover__brand-sep {
  font-size: 2rem;
  color: var(--slate-300);
  font-weight: 200;
}
.slide--cover .cover__title {
  font-size: var(--text-hero);
  font-weight: 700;
  letter-spacing: -0.025em;
  max-width: 16ch;
  line-height: 1.05;
}
.slide--cover .cover__subtitle {
  font-size: var(--text-h2);
  color: var(--slate-500);
  font-weight: 400;
}
.slide--cover .cover__meta {
  font-size: var(--text-small);
  color: var(--slate-500);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* ----- CHAPTER INTRO ----- */
.slide--chapter-intro {
  align-items: flex-start;
  justify-content: center;
  gap: var(--space-6);
  background:
    linear-gradient(135deg, var(--chapter-tint) 0%, transparent 60%),
    var(--surface-50);
}
.slide--chapter-intro .ch-num {
  font-family: var(--font-display);
  font-size: clamp(8rem, 18vw, 16rem);
  line-height: 0.85;
  font-weight: 700;
  color: var(--chapter-accent);
  letter-spacing: -0.04em;
  opacity: 0.95;
}
.slide--chapter-intro .ch-eyebrow {
  font-size: var(--text-h3);
  font-weight: 500;
  color: var(--chapter-accent);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-block-end: var(--space-3);
}
.slide--chapter-intro .ch-title {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  max-width: 18ch;
  line-height: 1.05;
  margin-block-end: var(--space-4);
}
.slide--chapter-intro .ch-summary {
  font-size: var(--text-h2);
  color: var(--slate-500);
  font-weight: 400;
  max-width: 50ch;
  line-height: 1.45;
}

/* ----- AGENDA ----- */
.slide--agenda .agenda__list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr 1fr;
  gap: var(--space-5);
  height: 100%;
}
.slide--agenda .agenda__item {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-10);
  background: var(--surface-0);
  border-radius: var(--radius-lg);
  border-inline-start: 6px solid var(--item-accent, var(--mint-500));
  box-shadow: var(--shadow-soft);
  transition: transform var(--duration-fast) var(--ease-out),
              box-shadow var(--duration-fast) var(--ease-out);
}
.slide--agenda .agenda__item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-medium);
}
.slide--agenda .agenda__num {
  font-family: var(--font-display);
  font-size: clamp(2rem, 3vw, 2.5rem);
  font-weight: 700;
  color: var(--item-accent, var(--mint-500));
  line-height: 1;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}
.slide--agenda .agenda__title {
  font-size: clamp(1.5rem, 2.2vw, 1.875rem);
  font-weight: 600;
  line-height: 1.15;
}
.slide--agenda .agenda__desc {
  font-size: var(--text-body);
  color: var(--slate-500);
  line-height: 1.5;
}

/* ----- CONTENT (general) ----- */
.slide--content .content-grid {
  display: grid;
  gap: var(--space-6);
}
.slide--content .content-grid--cols-2 { grid-template-columns: repeat(2, 1fr); }
.slide--content .content-grid--cols-3 { grid-template-columns: repeat(3, 1fr); }
.slide--content .content-grid--cols-4 { grid-template-columns: repeat(4, 1fr); }

/* ----- IFRAME / EMBED ----- */
.slide--embed {
  padding-block: var(--space-6);
}
.slide--embed .embed-frame {
  flex: 1;
  position: relative;
  width: 100%;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--surface-0);
  box-shadow: var(--shadow-medium);
  min-height: 0;
}
.slide--embed .embed-frame iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}
.slide--embed .embed-frame--image {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--surface-50);
}
.slide--embed .embed-frame--image img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

/* ----- TABLE ----- */
.slide--table .data-table-wrap {
  flex: 1;
  overflow: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-soft);
  background: var(--surface-0);
}

/* ----- CLOSING ----- */
.slide--closing {
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: var(--space-6);
  background:
    radial-gradient(ellipse at 50% 30%, rgba(22,217,168,0.08) 0%, transparent 60%),
    var(--surface-50);
}
.slide--closing .closing__title {
  font-size: clamp(3rem, 7vw, 5.5rem);
  font-weight: 700;
  letter-spacing: -0.03em;
}
.slide--closing .closing__brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-6);
  padding-block-start: var(--space-8);
  border-block-start: 1px solid var(--border-soft);
}
.slide--closing .closing__brand img.solugen { height: 32px; }
.slide--closing .closing__brand img.tmura   { height: 40px; }

/* ----- Error state ----- */
.slide-error {
  padding: var(--space-12);
  text-align: center;
  color: var(--slate-500);
  font-family: var(--font-body);
}
.slide-error h3 { color: var(--ink-900); margin-block-end: var(--space-2); }
.slide-error code {
  background: var(--surface-100);
  padding: 2px 8px;
  border-radius: 4px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}

/* Tighten vertical padding on dense slides so more content fits w/o scroll */
.slide--phases-intro,
.slide--phases-summary {
  padding-block: var(--space-6);
}
.slide--phases-intro .slide__header,
.slide--phases-summary .slide__header {
  margin-block-end: var(--space-4);
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .slide { padding: var(--space-8) var(--space-10); }
}
@media (max-width: 720px) {
  .slide { padding: var(--space-6) var(--space-4); }
  .slide--content .content-grid--cols-2,
  .slide--content .content-grid--cols-3,
  .slide--content .content-grid--cols-4 { grid-template-columns: 1fr; }
}