:root {
  --ink: #14213d;
  --muted: #596579;
  --paper: #f7f8fa;
  --white: #ffffff;
  --blue: #3c5488;
  --teal: #00a087;
  --red: #e64b35;
  --sky: #4dbbd5;
  --orange: #f39b7f;
  --gold: #efc000;
  --line: #dce2ea;
  --shadow: 0 18px 55px rgba(20, 33, 61, 0.13);
}

* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
  background: #dfe5ec;
  color: var(--ink);
  font-family: Inter, "Helvetica Neue", Arial, sans-serif;
}

button {
  font: inherit;
}

.deck {
  width: 100%;
  height: 100%;
  position: relative;
}

.slide {
  position: absolute;
  inset: 0;
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: 1.6rem;
  padding: clamp(2rem, 4.2vw, 5rem) clamp(2.2rem, 6vw, 7rem) 2.2rem;
  background:
    radial-gradient(circle at 94% 4%, rgba(77, 187, 213, 0.10), transparent 25%),
    var(--paper);
  opacity: 0;
  visibility: hidden;
  transform: translateX(3%);
  transition: opacity 260ms ease, transform 260ms ease;
}

.slide.active {
  opacity: 1;
  visibility: visible;
  transform: translateX(0);
  z-index: 2;
}

.slide::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 7px;
  background: linear-gradient(90deg, var(--blue), var(--teal), var(--red));
}

.title-slide {
  background:
    linear-gradient(118deg, rgba(20, 33, 61, 0.98), rgba(60, 84, 136, 0.94)),
    var(--ink);
  color: var(--white);
}

.title-slide::after {
  content: "";
  position: absolute;
  width: min(56vw, 850px);
  height: min(56vw, 850px);
  right: -18vw;
  bottom: -35vw;
  border: 2px solid rgba(255, 255, 255, 0.12);
  border-radius: 50%;
  box-shadow: 0 0 0 70px rgba(255, 255, 255, 0.025),
              0 0 0 140px rgba(255, 255, 255, 0.02);
}

.kicker {
  margin: 0 0 0.6rem;
  color: var(--teal);
  font-size: clamp(0.8rem, 1.1vw, 1.1rem);
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.title-slide .kicker {
  color: #77dfd0;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 1100px;
  margin-bottom: 1.2rem;
  font-size: clamp(2.9rem, 6vw, 6.8rem);
  line-height: 0.98;
  letter-spacing: -0.055em;
}

h2 {
  margin-bottom: 0;
  font-size: clamp(2rem, 3.4vw, 4rem);
  line-height: 1.04;
  letter-spacing: -0.035em;
}

h3 {
  margin-bottom: 0.5rem;
  font-size: clamp(1.05rem, 1.45vw, 1.55rem);
}

.subtitle {
  max-width: 850px;
  color: rgba(255, 255, 255, 0.78);
  font-size: clamp(1.15rem, 1.8vw, 1.85rem);
  line-height: 1.45;
}

.title-meta {
  align-self: end;
  display: flex;
  gap: 2rem;
  color: rgba(255, 255, 255, 0.68);
  font-size: 1rem;
}

.content {
  min-height: 0;
  display: flex;
  align-items: center;
}

.grid-2 {
  width: 100%;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(1.5rem, 3vw, 3.5rem);
  align-items: center;
}

.grid-3 {
  width: 100%;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(1rem, 2vw, 2rem);
}

.card {
  height: 100%;
  padding: clamp(1.1rem, 2vw, 2rem);
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.88);
  box-shadow: 0 8px 28px rgba(20, 33, 61, 0.06);
}

.card.accent-blue {
  border-top: 6px solid var(--blue);
}

.card.accent-teal {
  border-top: 6px solid var(--teal);
}

.card.accent-red {
  border-top: 6px solid var(--red);
}

.big-number {
  display: block;
  margin-bottom: 0.35rem;
  color: var(--blue);
  font-size: clamp(2.2rem, 4vw, 4.7rem);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.05em;
}

.metric-label {
  color: var(--muted);
  font-size: clamp(0.86rem, 1.15vw, 1.12rem);
  line-height: 1.35;
}

.question {
  max-width: 850px;
  padding-left: 1.3rem;
  border-left: 6px solid var(--red);
  font-size: clamp(1.4rem, 2.5vw, 2.8rem);
  font-weight: 700;
  line-height: 1.25;
}

.plain-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.plain-list li {
  position: relative;
  margin: 0.8rem 0;
  padding-left: 1.4rem;
  color: var(--muted);
  font-size: clamp(0.95rem, 1.3vw, 1.3rem);
  line-height: 1.4;
}

.plain-list li::before {
  content: "";
  position: absolute;
  top: 0.55em;
  left: 0;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--teal);
}

.cycle-flow {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.8rem;
  width: 100%;
}

.cycle {
  position: relative;
  padding: 1.5rem 1rem;
  border-radius: 16px;
  background: var(--white);
  border: 1px solid var(--line);
  text-align: center;
  box-shadow: 0 8px 26px rgba(20, 33, 61, 0.06);
}

.cycle:not(:last-child)::after {
  content: "→";
  position: absolute;
  top: 50%;
  right: -1rem;
  z-index: 1;
  transform: translateY(-50%);
  color: var(--red);
  font-size: 1.5rem;
  font-weight: 800;
}

.cycle strong {
  display: block;
  color: var(--blue);
  font-size: clamp(1.5rem, 2.4vw, 2.7rem);
}

.cycle span {
  color: var(--muted);
}

.workflow {
  width: 100%;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0.65rem;
  align-items: center;
}

.workflow-step {
  position: relative;
  padding: 1.25rem 0.8rem;
  border-radius: 14px;
  background: var(--white);
  border: 1px solid var(--line);
  text-align: center;
  font-weight: 700;
}

.workflow-step:not(:last-child)::after {
  content: "›";
  position: absolute;
  right: -0.58rem;
  top: 50%;
  z-index: 1;
  transform: translateY(-52%);
  color: var(--red);
  font-size: 1.8rem;
}

.formula {
  padding: 1.4rem 1.8rem;
  border-radius: 14px;
  background: var(--ink);
  color: var(--white);
  font-family: Georgia, serif;
  font-size: clamp(1.1rem, 1.65vw, 1.7rem);
  line-height: 1.5;
  text-align: center;
}

.image-wrap {
  position: relative;
  min-height: 0;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.result-image {
  display: block;
  max-width: 100%;
  max-height: min(64vh, 700px);
  object-fit: contain;
  border-radius: 10px;
  background: var(--white);
  box-shadow: var(--shadow);
  cursor: zoom-in;
}

.result-image.tall {
  max-height: min(67vh, 760px);
}

.caption {
  margin-top: 0.7rem;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.35;
}

.metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.8rem;
}

.metric {
  padding: 1rem;
  border-radius: 14px;
  background: var(--white);
  border: 1px solid var(--line);
  text-align: center;
}

.metric b {
  display: block;
  color: var(--blue);
  font-size: clamp(1.6rem, 2.7vw, 3rem);
}

.metric span {
  color: var(--muted);
}

.comparison {
  width: 100%;
  border-collapse: collapse;
  overflow: hidden;
  border-radius: 14px;
  background: var(--white);
  box-shadow: 0 8px 28px rgba(20, 33, 61, 0.06);
}

.comparison th,
.comparison td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--line);
  text-align: center;
  font-size: clamp(0.9rem, 1.2vw, 1.2rem);
}

.comparison th {
  background: var(--ink);
  color: var(--white);
}

.comparison tr:last-child td {
  border-bottom: 0;
}

.comparison .best {
  color: var(--teal);
  font-weight: 800;
}

.callout {
  padding: 1rem 1.2rem;
  border-left: 5px solid var(--gold);
  background: rgba(239, 192, 0, 0.10);
  color: var(--ink);
  font-size: clamp(0.95rem, 1.25vw, 1.25rem);
  line-height: 1.4;
}

.status {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.45rem 0.8rem;
  border-radius: 999px;
  background: rgba(0, 160, 135, 0.12);
  color: #007d6b;
  font-weight: 800;
}

.status::before {
  content: "";
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 50%;
  background: var(--teal);
}

.takeaway {
  font-size: clamp(1.1rem, 1.7vw, 1.7rem);
  line-height: 1.45;
}

.takeaway strong {
  color: var(--red);
}

.footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: #7b8594;
  font-size: 0.78rem;
  letter-spacing: 0.02em;
}

.title-slide .footer {
  color: rgba(255, 255, 255, 0.48);
}

.controls {
  position: fixed;
  right: 1.2rem;
  bottom: 1.05rem;
  z-index: 20;
  display: flex;
  gap: 0.4rem;
}

.control {
  width: 2.4rem;
  height: 2.4rem;
  border: 1px solid rgba(20, 33, 61, 0.14);
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.88);
  color: var(--ink);
  cursor: pointer;
  box-shadow: 0 4px 14px rgba(20, 33, 61, 0.12);
}

.control:hover {
  background: var(--ink);
  color: var(--white);
}

.progress {
  position: fixed;
  left: 0;
  bottom: 0;
  z-index: 25;
  height: 5px;
  width: 0;
  background: var(--red);
  transition: width 220ms ease;
}

.counter {
  position: fixed;
  left: 1.2rem;
  bottom: 1.25rem;
  z-index: 20;
  color: #667184;
  font-size: 0.85rem;
  font-weight: 700;
}

.overview .slide {
  position: relative;
  inset: auto;
  width: min(44vw, 700px);
  height: min(40vh, 430px);
  display: grid;
  flex: none;
  padding: 1.5rem;
  opacity: 1;
  visibility: visible;
  transform: none;
  overflow: hidden;
  cursor: pointer;
  box-shadow: var(--shadow);
}

.overview .deck {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  align-content: flex-start;
  justify-content: center;
  height: auto;
  min-height: 100%;
  padding: 2rem;
}

body.overview {
  overflow: auto;
}

.overview .slide > * {
  transform: scale(0.62);
  transform-origin: top left;
  width: 160%;
}

.overview .controls,
.overview .counter {
  position: fixed;
}

.notes-panel {
  position: fixed;
  left: 50%;
  bottom: 1rem;
  z-index: 30;
  width: min(800px, calc(100vw - 8rem));
  max-height: 30vh;
  padding: 1rem 1.2rem;
  overflow: auto;
  transform: translateX(-50%);
  border-radius: 14px;
  background: rgba(20, 33, 61, 0.96);
  color: var(--white);
  box-shadow: var(--shadow);
  display: none;
  line-height: 1.45;
}

.notes-panel.visible {
  display: block;
}

.lightbox {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  background: rgba(8, 16, 31, 0.93);
}

.lightbox.visible {
  display: flex;
}

.lightbox img {
  max-width: 96vw;
  max-height: 94vh;
  object-fit: contain;
}

.lightbox-close {
  position: absolute;
  top: 1rem;
  right: 1.2rem;
  border: 0;
  background: transparent;
  color: var(--white);
  font-size: 2.4rem;
  cursor: pointer;
}

@media (max-width: 900px) {
  .slide {
    padding: 2rem 1.4rem 3rem;
    gap: 1rem;
  }

  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }

  .grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }

  .workflow {
    grid-template-columns: 1fr;
  }

  .workflow-step:not(:last-child)::after {
    display: none;
  }

  .content {
    overflow: auto;
    align-items: flex-start;
  }

  .cycle-flow {
    grid-template-columns: repeat(2, 1fr);
  }

  .cycle::after {
    display: none;
  }

  .metrics {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .slide,
  .progress {
    transition: none;
  }
}