:root {
  color-scheme: dark;
  --bg: #07090d;
  --panel: rgba(17, 22, 32, 0.78);
  --panel-solid: #111620;
  --text: #f4f7fb;
  --muted: #9aa8bb;
  --line: rgba(255, 255, 255, 0.12);
  --blue: #38bdf8;
  --cyan: #22d3ee;
  --green: #34d399;
  --yellow: #facc15;
  --pink: #f472b6;
  --danger: #fb7185;
  --radius: 28px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  overflow: hidden;
  background:
    radial-gradient(circle at 15% 20%, rgba(34, 211, 238, 0.18), transparent 34%),
    radial-gradient(circle at 85% 25%, rgba(244, 114, 182, 0.12), transparent 32%),
    linear-gradient(135deg, #06080d 0%, #0d1320 48%, #080a0f 100%);
  color: var(--text);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    "PingFang HK", "Noto Sans TC", "Microsoft JhengHei", sans-serif;
}

button,
input {
  font: inherit;
}

.ambient {
  position: fixed;
  z-index: 0;
  width: 38vw;
  height: 38vw;
  border-radius: 999px;
  filter: blur(70px);
  opacity: 0.16;
  pointer-events: none;
  animation: float 10s ease-in-out infinite alternate;
}

.ambient-one {
  left: -10vw;
  bottom: 0;
  background: var(--cyan);
}

.ambient-two {
  right: -12vw;
  top: 18vh;
  background: var(--pink);
  animation-delay: -4s;
}

@keyframes float {
  from {
    transform: translate3d(0, 0, 0) scale(1);
  }
  to {
    transform: translate3d(40px, -26px, 0) scale(1.08);
  }
}

.topbar {
  position: fixed;
  top: 18px;
  left: 50%;
  z-index: 20;
  width: min(1180px, calc(100vw - 32px));
  display: flex;
  align-items: center;
  justify-content: space-between;
  transform: translateX(-50%);
  padding: 12px 16px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(7, 9, 13, 0.72);
  backdrop-filter: blur(18px);
}

.topbar strong {
  display: block;
  margin-top: 3px;
  font-size: 15px;
}

.nav {
  display: flex;
  gap: 6px;
}

.nav button,
.controls button {
  cursor: pointer;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
  padding: 8px 13px;
  transition: 180ms ease;
}

.nav button:hover,
.controls button:hover {
  border-color: rgba(56, 189, 248, 0.7);
  background: rgba(56, 189, 248, 0.12);
  transform: translateY(-1px);
}

.deck {
  position: relative;
  z-index: 1;
  height: 100vh;
  overflow-y: auto;
  scroll-snap-type: y mandatory;
}

.slide {
  min-height: 100vh;
  scroll-snap-align: start;
  display: grid;
  place-items: center;
  padding: 104px 24px 74px;
}

.slide-content {
  width: min(1120px, 100%);
}

.reveal {
  opacity: 0;
  transform: translateY(26px) scale(0.985);
  transition:
    opacity 620ms ease,
    transform 620ms ease;
}

.slide.active .reveal {
  opacity: 1;
  transform: translateY(0) scale(1);
}

.eyebrow {
  color: var(--cyan);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

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

h1 {
  max-width: 980px;
  margin-bottom: 22px;
  font-size: clamp(58px, 9vw, 122px);
  line-height: 0.88;
  letter-spacing: -0.08em;
}

h2 {
  margin-bottom: 22px;
  font-size: clamp(38px, 5.6vw, 76px);
  line-height: 0.96;
  letter-spacing: -0.055em;
}

h3 {
  font-size: 22px;
  letter-spacing: -0.02em;
}

p {
  color: var(--muted);
  font-size: clamp(18px, 2vw, 23px);
  line-height: 1.55;
}

.lead {
  max-width: 780px;
  font-size: clamp(22px, 2.4vw, 30px);
}

.pill-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 24px;
}

.pill {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 7px 13px;
  color: #cbd5e1;
  background: rgba(255, 255, 255, 0.05);
  font-size: 13px;
  font-weight: 700;
}

.pill.accent {
  border-color: rgba(52, 211, 153, 0.55);
  color: #d1fae5;
  background: rgba(52, 211, 153, 0.13);
}

.hero-grid,
.three-points,
.roi-grid,
.kpi-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-top: 36px;
}

.hero-card,
.three-points > div,
.roi-box,
.kpi-grid > div,
.cards-2x2 > div,
.problem-list > div,
.risk-list > div,
.decision-list label,
.timeline article,
.compare-card {
  border: 1px solid var(--line);
  border-radius: 22px;
  background: var(--panel);
  backdrop-filter: blur(14px);
}

.hero-card,
.three-points > div,
.roi-box,
.kpi-grid > div {
  padding: 22px;
}

.hero-card span,
.roi-box span,
.kpi-grid span,
.metric-panel span,
.compare-card span {
  display: block;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.hero-card strong,
.roi-box strong,
.metric-panel strong,
.big-stat strong {
  display: block;
  margin-top: 6px;
  font-size: clamp(28px, 4vw, 50px);
  line-height: 0.98;
  letter-spacing: -0.04em;
}

.split .slide-content {
  display: grid;
  grid-template-columns: 1.08fr 0.92fr;
  gap: 42px;
  align-items: center;
}

.problem-list,
.risk-list,
.decision-list {
  display: grid;
  gap: 14px;
}

.problem-list > div,
.risk-list > div,
.decision-list label {
  padding: 18px;
}

.problem-list strong,
.risk-list b,
.decision-list label {
  color: var(--text);
  font-size: 18px;
}

.problem-list p,
.risk-list span {
  display: block;
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.45;
}

.quote-card,
.campaign-card {
  border-left: 4px solid var(--cyan);
  border-radius: 22px;
  padding: 30px;
  background: rgba(34, 211, 238, 0.08);
}

.quote-card p,
.campaign-card p {
  margin-bottom: 0;
  color: #dbeafe;
  font-size: clamp(24px, 3.2vw, 42px);
  line-height: 1.18;
  letter-spacing: -0.035em;
}

.three-points b {
  display: block;
  margin-bottom: 10px;
  color: var(--cyan);
  font-size: 24px;
}

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

.funnel,
.timeline,
.comparison,
.media-layout,
.media-grid,
.video-layout {
  display: grid;
  gap: 16px;
}

.funnel {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin: 28px 0;
}

.funnel > div {
  position: relative;
  min-height: 170px;
  padding: 22px;
  overflow: hidden;
  border: 1px solid rgba(56, 189, 248, 0.18);
  border-radius: 24px;
  background: linear-gradient(180deg, rgba(56, 189, 248, 0.12), rgba(255, 255, 255, 0.04));
}

.funnel span {
  display: inline-grid;
  width: 34px;
  height: 34px;
  margin-bottom: 24px;
  place-items: center;
  border-radius: 999px;
  background: var(--cyan);
  color: #06202a;
  font-weight: 900;
}

.funnel strong,
.funnel small {
  display: block;
}

.funnel small {
  margin-top: 8px;
  color: var(--muted);
  font-size: 14px;
}

.note {
  max-width: 1000px;
  padding: 16px 18px;
  border: 1px solid rgba(250, 204, 21, 0.2);
  border-radius: 18px;
  background: rgba(250, 204, 21, 0.08);
  color: #fef3c7;
  font-size: 17px;
}

.media-layout {
  grid-template-columns: 1.1fr 0.9fr;
  align-items: center;
}

.media-grid,
.video-layout {
  grid-template-columns: 1fr 1fr;
  align-items: center;
}

.media-layout img,
.media-grid img {
  width: 100%;
  max-height: 62vh;
  object-fit: contain;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: #05070a;
}

.stat-stack,
.metric-panel {
  display: grid;
  gap: 16px;
}

.big-stat {
  padding: 28px;
  border: 1px solid rgba(52, 211, 153, 0.28);
  border-radius: 24px;
  background: rgba(52, 211, 153, 0.08);
}

.big-stat strong {
  color: var(--green);
}

.metric-panel {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.metric-panel > div {
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.05);
}

.metric-panel strong {
  color: var(--cyan);
}

.video-layout video {
  width: min(390px, 100%);
  max-height: 64vh;
  justify-self: center;
  border: 1px solid rgba(56, 189, 248, 0.3);
  border-radius: 26px;
  background: #000;
}

.metric-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 20px;
}

.metric-list span {
  border: 1px solid rgba(56, 189, 248, 0.3);
  border-radius: 999px;
  padding: 8px 12px;
  color: #dff6ff;
  background: rgba(56, 189, 248, 0.08);
  font-weight: 800;
}

.timeline {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.timeline article {
  min-height: 260px;
  padding: 22px;
}

.timeline article span {
  color: var(--green);
  font-weight: 900;
}

.timeline article h3 {
  margin: 22px 0 12px;
}

.timeline article p {
  font-size: 16px;
}

.cards-2x2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.cards-2x2 > div {
  min-height: 170px;
  padding: 24px;
}

.cards-2x2 b {
  display: block;
  margin-bottom: 12px;
  color: var(--cyan);
  font-size: 24px;
}

.cards-2x2 p {
  font-size: 17px;
}

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

.compare-card {
  min-height: 260px;
  padding: 28px;
}

.compare-card strong {
  display: block;
  margin: 16px 0;
  font-size: clamp(36px, 5vw, 64px);
  letter-spacing: -0.055em;
}

.compare-card.active {
  border-color: rgba(52, 211, 153, 0.42);
  background: rgba(52, 211, 153, 0.1);
}

.compare-card.muted {
  border-color: rgba(251, 113, 133, 0.25);
  background: rgba(251, 113, 133, 0.06);
}

.compare-card small {
  display: block;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.5;
}

.scenario-table {
  display: grid;
  gap: 10px;
  margin-top: 22px;
}

.scenario-table > div {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 14px;
  align-items: center;
  padding: 15px 18px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.05);
}

.scenario-table b {
  color: var(--cyan);
}

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

.kpi-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.kpi-grid strong {
  display: block;
  margin-bottom: 8px;
  color: var(--cyan);
  font-size: 24px;
}

.decision-list label {
  display: flex;
  gap: 12px;
  align-items: center;
  cursor: pointer;
}

.decision-list input {
  width: 22px;
  height: 22px;
  accent-color: var(--green);
}

.closing {
  margin-top: 28px;
  color: #d1fae5;
  font-size: clamp(24px, 3vw, 38px);
  line-height: 1.2;
  letter-spacing: -0.035em;
}

.controls {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 30;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(7, 9, 13, 0.74);
  backdrop-filter: blur(18px);
}

.controls span {
  min-width: 64px;
  color: var(--muted);
  text-align: center;
  font-size: 13px;
  font-weight: 800;
}

.progress {
  position: fixed;
  left: 0;
  top: 0;
  z-index: 40;
  width: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--cyan), var(--green));
  transition: width 180ms ease;
}

@media (max-width: 880px) {
  body {
    overflow: auto;
  }

  .topbar {
    display: none;
  }

  .deck {
    height: auto;
    overflow: visible;
    scroll-snap-type: none;
  }

  .slide {
    min-height: auto;
    padding: 48px 18px;
  }

  .split .slide-content,
  .media-layout,
  .media-grid,
  .video-layout,
  .comparison {
    grid-template-columns: 1fr;
  }

  .hero-grid,
  .three-points,
  .roi-grid,
  .kpi-grid,
  .funnel,
  .timeline,
  .cards-2x2 {
    grid-template-columns: 1fr;
  }

  .controls {
    display: none;
  }
}