/* ─── Slayt 1: Kapak ─── */
#s1 {
  background: var(--bg);
  align-items: flex-start;
  justify-content: center;
  padding-left: clamp(56px, 8vw, 120px);
}
#s1 .cover-logo {
  height: 56px;
  width: auto;
  margin-bottom: 32px;
  opacity: 0.85;
}
#s1 .cover-tag {
  margin-bottom: 20px;
}
#s1 .cover-title {
  font-family: var(--font-display);
  font-size: clamp(72px, 9vw, 112px);
  font-weight: 700;
  line-height: 1.0;
  color: var(--ink);
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}
#s1 .cover-sub {
  font-family: var(--font-display);
  font-size: clamp(18px, 2vw, 26px);
  font-weight: 500;
  color: var(--accent);
  margin-bottom: 6px;
}
#s1 .cover-desc {
  font-size: clamp(14px, 1.4vw, 18px);
  color: var(--ink-soft);
  max-width: 580px;
  margin-bottom: 40px;
}
#s1 .cover-team {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
#s1 .cover-team span {
  font-size: 14px;
  color: var(--ink-soft);
  font-family: var(--font-body);
}
#s1 .cover-line {
  width: 56px; height: 3px;
  background: var(--accent);
  border-radius: 2px;
  margin-bottom: 28px;
}
#s1 .cover-deco {
  position: absolute;
  right: 0; top: 0; bottom: 0;
  width: 38%;
  background: linear-gradient(135deg, var(--bg-2) 0%, var(--line) 100%);
  clip-path: polygon(18% 0%, 100% 0%, 100% 100%, 0% 100%);
  opacity: 0.5;
  pointer-events: none;
}

/* ─── Slayt 2: Bant Durduran Filtre ─── */
#s2 .examples-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-top: 8px;
}
#s2 .example-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
#s2 .example-card .ex-img {
  width: 100%;
  height: 130px;
  object-fit: contain;
  background: var(--bg-2);
  padding: 10px;
}
#s2 .example-card .ex-body {
  padding: 12px 14px;
}
#s2 .example-card .ex-text {
  font-size: 12px;
  color: var(--ink-soft);
  line-height: 1.5;
}
#s2 .example-card .ex-title {
  font-weight: 700;
  color: var(--ink);
}
#s2 .s2-left {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
#s2 .main-img-frame {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 14px;
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}
#s2 .main-img-frame img {
  max-height: 200px;
  object-fit: contain;
}

/* ─── Slayt 3: Makale ─── */
#s3 .info-boxes {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 12px;
  margin-top: 4px;
}
#s3 .info-box {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px 18px;
}
#s3 .info-box .ib-icon {
  font-size: 22px;
  margin-bottom: 8px;
}
#s3 .info-box .ib-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 5px;
}
#s3 .info-box .ib-text {
  font-size: 12px;
  color: var(--ink-soft);
  line-height: 1.45;
}

/* ─── Slayt 4: Chebyshev ─── */
#s4 .specs-row {
  display: flex;
  gap: 16px;
  margin-top: 8px;
}
#s4 .spec-chip {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 14px 20px;
  flex: 1;
  text-align: center;
}
#s4 .spec-chip .sc-val {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  color: var(--accent);
  display: block;
}
#s4 .spec-chip .sc-lbl {
  font-size: 12px;
  color: var(--ink-soft);
  margin-top: 3px;
}

/* ─── Slayt 5: Özgün Filtre ─── */
#s5 .s5-imgs {
  display: flex;
  gap: 10px;
}
#s5 .s5-imgs .img-frame {
  flex: 1;
  height: 160px;
}
#s5 .s5-imgs .img-frame img {
  max-height: 140px;
}

/* ─── Slayt 6-7-8: Katman Sahnesi ─── */
.layer-slide {
  flex-direction: row !important;
  gap: clamp(32px, 4vw, 64px);
  align-items: center;
  /* Leave room on the left for the fixed stage */
  padding-left: calc(clamp(240px, 38vw, 480px) + clamp(48px, 7vw, 96px) + clamp(32px, 4vw, 64px));
}

/* The stage is fixed-position, managed entirely by JS */
#layer-stage {
  position: fixed;
  display: none;
  z-index: 50;
  pointer-events: none;
  overflow: hidden;
}
#layer-stage img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: fill;
  border: none;
  outline: none;
}
#layer-stage #layer-ground  { z-index: 1; }
#layer-stage #layer-substrat { z-index: 2; }
#layer-stage #layer-bakir   { z-index: 3; }

.layer-info {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.layer-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
}
.layer-badge .badge-num {
  width: 24px; height: 24px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 700;
}

/* ─── Slayt 9: Kontrol Edilebilirlik ─── */
#s9 .rotating-model {
  width: clamp(200px, 30vw, 380px);
  aspect-ratio: 520/588;
  position: relative;
  flex-shrink: 0;
  transform-style: preserve-3d;
}
#s9 .rotating-model img,
#s9 .rotating-model svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

/* ─── Slayt 12: S2,1 ─── */
#s12 .s12-imgs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}
#s12 .s12-imgs .img-frame {
  height: min(190px, 25vh);
}

/* ─── Slayt 14: Geometrik Faktörler ─── */
#s14 .result-box {
  background: var(--surface);
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  border-radius: 10px;
  padding: 16px 20px;
  margin-top: 16px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--ink-soft);
}

/* ─── Slayt 15: Sonuç ─── */
#s15 {
  align-items: center;
  justify-content: center;
  text-align: center;
}
#s15 .result-items {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 32px;
  max-width: 820px;
}
#s15 .result-item {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 28px 24px;
  text-align: left;
}
#s15 .result-item .ri-icon {
  font-size: 28px;
  margin-bottom: 12px;
}
#s15 .result-item .ri-title {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 8px;
}
#s15 .result-item .ri-text {
  font-size: 14px;
  color: var(--ink-soft);
  line-height: 1.5;
}
#s15 .closing-line {
  margin-top: 40px;
  font-size: 15px;
  color: var(--ink-soft);
}
#s15 .uni-logo {
  height: 40px;
  margin: 24px auto 0;
  opacity: 0.6;
}