:root {
  --bg: #09111f;
  --bg-soft: rgba(12, 27, 48, 0.72);
  --bg-panel: rgba(11, 23, 39, 0.78);
  --line: rgba(111, 157, 224, 0.22);
  --line-strong: rgba(98, 171, 255, 0.38);
  --text-main: #f6fbff;
  --text-secondary: rgba(218, 229, 244, 0.72);
  --text-muted: rgba(177, 196, 222, 0.48);
  --primary: #63b3ff;
  --accent: #72ffd2;
  --accent-soft: rgba(114, 255, 210, 0.14);
  --shadow: 0 24px 64px rgba(0, 0, 0, 0.36);
  --radius-xl: 28px;
  --radius-lg: 22px;
  --radius-md: 18px;
  --radius-sm: 14px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  overflow: hidden;
  background:
    radial-gradient(circle at 20% 20%, rgba(69, 138, 255, 0.18), transparent 28%),
    radial-gradient(circle at 80% 25%, rgba(114, 255, 210, 0.1), transparent 22%),
    linear-gradient(135deg, #040914 0%, #0a1426 52%, #07111e 100%);
  color: var(--text-main);
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
}

body {
  position: relative;
}

button,
input,
textarea,
select {
  font: inherit;
}

.orientation-tip {
  display: none;
}

.app-shell {
  position: relative;
  width: 100vw;
  height: 100vh;
  padding: 2.2vh 2.2vw;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 18vw;
  grid-template-rows: auto minmax(0, 1fr) auto;
  gap: 2vh 1.6vw;
}

.ambient,
.grid-mask,
.cursor-glow {
  position: fixed;
  pointer-events: none;
  inset: 0;
}

.ambient--one {
  background:
    linear-gradient(90deg, transparent 0%, rgba(90, 176, 255, 0.05) 50%, transparent 100%),
    linear-gradient(transparent 0%, rgba(90, 176, 255, 0.04) 50%, transparent 100%);
  mask-image: radial-gradient(circle at center, black 30%, transparent 75%);
}

.ambient--two {
  background:
    radial-gradient(circle at 22% 30%, rgba(99, 179, 255, 0.08), transparent 24%),
    radial-gradient(circle at 78% 68%, rgba(114, 255, 210, 0.06), transparent 21%);
  filter: blur(18px);
}

.grid-mask {
  background-image:
    linear-gradient(rgba(126, 164, 220, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(126, 164, 220, 0.07) 1px, transparent 1px);
  background-size: 3.2vw 3.2vw;
  opacity: 0.42;
}

.cursor-glow {
  width: 18vw;
  height: 18vw;
  background: radial-gradient(circle, rgba(114, 255, 210, 0.14) 0%, transparent 72%);
  transform: translate(-50%, -50%);
  opacity: 0.7;
  transition: left 120ms ease, top 120ms ease, opacity 160ms ease;
}

.topbar,
.side-panel,
.footer-bar,
.deck-window,
.nav-button {
  position: relative;
  z-index: 1;
}

.topbar {
  grid-column: 1 / 3;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.2rem 1.4rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background: linear-gradient(180deg, rgba(8, 18, 32, 0.82), rgba(8, 18, 32, 0.56));
  box-shadow: var(--shadow);
  backdrop-filter: blur(20px);
}

.eyebrow,
.meta-label {
  margin: 0;
  color: var(--text-muted);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  font-family: "Space Grotesk", sans-serif;
  font-size: 0.72rem;
}

.deck-title {
  margin: 0.45rem 0 0;
  font-size: clamp(1.6rem, 2vw, 2.6rem);
  line-height: 1.1;
}

.topbar__meta {
  display: flex;
  gap: 1rem;
}

.topbar__meta > div,
.progress-card,
.page-nav__item {
  border: 1px solid var(--line);
  background: rgba(12, 24, 41, 0.65);
  border-radius: var(--radius-md);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.02);
}

.topbar__meta > div {
  min-width: 8.4rem;
  padding: 0.9rem 1rem;
}

.topbar__meta strong {
  display: block;
  margin-top: 0.25rem;
  font-size: 1rem;
}

.stage {
  grid-column: 1 / 2;
  position: relative;
  min-width: 0;
  display: flex;
  align-items: center;
  gap: 1vw;
}

.deck-window {
  flex: 1;
  height: 100%;
  overflow: hidden;
  border-radius: 2rem;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(8, 18, 32, 0.82), rgba(8, 18, 32, 0.52));
  box-shadow: var(--shadow);
  backdrop-filter: blur(20px);
}

.deck-track {
  display: flex;
  height: 100%;
  transition: transform 560ms cubic-bezier(0.22, 1, 0.36, 1);
}

.slide {
  position: relative;
  width: 100%;
  flex: 0 0 100%;
  padding: 2rem 2rem 1.8rem;
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

.slide::before {
  content: "";
  position: absolute;
  inset: 1.1rem;
  border-radius: 1.6rem;
  border: 1px solid rgba(111, 157, 224, 0.08);
  pointer-events: none;
}

.slide-header {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: flex-start;
}

.slide-kicker {
  margin: 0;
  color: var(--primary);
  font-family: "Space Grotesk", sans-serif;
  font-size: 0.8rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.slide-title {
  margin: 0.5rem 0 0;
  font-size: clamp(1.8rem, 2.6vw, 3rem);
  line-height: 1.12;
}

.slide-subtitle,
.slide-purpose,
.slide-footer-note,
.slide-note {
  margin: 0.35rem 0 0;
  color: var(--text-secondary);
  font-size: 0.94rem;
  line-height: 1.62;
}

.slide-purpose {
  max-width: 26rem;
}

.slide-no {
  min-width: 5rem;
  padding: 0.8rem 0.95rem;
  text-align: right;
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: rgba(8, 18, 32, 0.56);
}

.slide-no strong {
  display: block;
  font-family: "Space Grotesk", sans-serif;
  font-size: 1.6rem;
  line-height: 1;
}

.slide-no span {
  color: var(--text-muted);
  font-size: 0.82rem;
  letter-spacing: 0.18em;
}

.slide-body {
  min-height: 0;
  flex: 1;
  display: grid;
  gap: 1rem;
}

.layout-cover .slide-body,
.layout-case-title .slide-body,
.layout-ending .slide-body {
  grid-template-columns: 1.4fr 0.8fr;
  align-items: stretch;
}

.layout-center-statement .slide-body,
.layout-two-case-conclusion .slide-body {
  grid-template-rows: auto 1fr;
}

.panel,
.card,
.list-item,
.flow-step,
.number-item,
.question-card,
.timeline-card {
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(13, 28, 47, 0.84), rgba(9, 20, 35, 0.62));
  border-radius: var(--radius-lg);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.03);
}

.hero-copy,
.hero-visual,
.statement-box,
.columns-grid,
.statement-grid,
.split-grid,
.comparison-grid,
.quote-panel,
.process-line,
.layers-grid,
.summary-grid,
.questions-grid,
.ending-panel {
  min-height: 0;
}

.hero-copy,
.hero-visual,
.statement-box,
.quote-panel,
.ending-panel {
  padding: 1.5rem;
}

.hero-copy {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.hero-tag {
  display: inline-flex;
  width: fit-content;
  padding: 0.45rem 0.8rem;
  border-radius: 999px;
  border: 1px solid rgba(114, 255, 210, 0.3);
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.82rem;
}

.hero-highlight {
  margin: 1rem 0 0;
  font-size: clamp(1.46rem, 2vw, 2.28rem);
  font-weight: 800;
  line-height: 1.28;
}

.hero-visual {
  position: relative;
  overflow: hidden;
  display: grid;
  place-items: center;
  background:
    radial-gradient(circle at 30% 25%, rgba(99, 179, 255, 0.26), transparent 30%),
    linear-gradient(160deg, rgba(11, 23, 39, 0.9), rgba(13, 31, 55, 0.65));
}

.hero-visual::before,
.hero-visual::after {
  content: "";
  position: absolute;
  border: 1px solid rgba(114, 255, 210, 0.2);
  border-radius: 1.2rem;
}

.hero-visual::before {
  inset: 12% 14%;
}

.hero-visual::after {
  inset: 22% 24%;
}

.hero-visual__core {
  position: relative;
  display: grid;
  gap: 0.7rem;
  width: min(100%, 16rem);
  z-index: 1;
}

.hero-node {
  padding: 0.9rem 1rem;
  border: 1px solid rgba(99, 179, 255, 0.24);
  border-radius: 1rem;
  background: rgba(9, 20, 35, 0.78);
  color: var(--text-secondary);
  text-align: center;
}

.footer-meta {
  display: flex;
  gap: 0.8rem;
  flex-wrap: wrap;
}

.footer-chip {
  padding: 0.65rem 0.9rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--text-secondary);
}

.statement-box {
  display: grid;
  gap: 1rem;
  align-items: center;
}

.statement-box strong {
  font-size: clamp(1.34rem, 1.72vw, 1.92rem);
  line-height: 1.48;
}

.mini-bullets {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.9rem;
}

.list-item {
  padding: 1rem;
}

.layout-center-statement .statement-box {
  padding: 1.8rem 2rem;
}

.layout-center-statement .statement-box strong {
  font-size: clamp(1.52rem, 2.02vw, 2.12rem);
  line-height: 1.5;
}

.layout-center-statement .mini-bullets {
  gap: 1.15rem;
}

.layout-center-statement .list-item {
  padding: 1.35rem 1.25rem;
}

.layout-center-statement .list-item strong {
  margin-bottom: 0.8rem;
  font-size: 1.12rem;
}

.layout-center-statement .list-item p {
  font-size: 1.02rem;
  line-height: 1.78;
}

.list-item strong,
.card__title,
.flow-step strong,
.number-item strong,
.question-card strong,
.timeline-card strong {
  display: block;
  margin-bottom: 0.55rem;
  font-size: 0.98rem;
}

.list-item p,
.card p,
.flow-step p,
.number-item p,
.question-card p,
.timeline-card p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.68;
}

.columns-grid,
.statement-grid,
.layers-grid,
.summary-grid,
.questions-grid {
  display: grid;
  gap: 1rem;
}

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

.card,
.timeline-card,
.question-card,
.number-item {
  padding: 1.25rem;
}

.card__index {
  font-family: "Space Grotesk", sans-serif;
  color: var(--primary);
  font-size: 0.82rem;
  letter-spacing: 0.18em;
}

.card ul,
.comparison-card ul,
.split-side ul,
.quote-list,
.flow-details {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.6rem;
}

.card li,
.comparison-card li,
.split-side li,
.quote-list li,
.flow-details li {
  color: var(--text-secondary);
  padding-left: 1rem;
  position: relative;
  font-size: 0.95rem;
  line-height: 1.68;
}

.card li::before,
.comparison-card li::before,
.split-side li::before,
.quote-list li::before,
.flow-details li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72rem;
  width: 0.38rem;
  height: 0.38rem;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 5px rgba(114, 255, 210, 0.08);
}

.statement-grid .card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.statement-grid .card__title {
  margin-top: 0.75rem;
  font-size: 1.08rem;
  line-height: 1.6;
}

.card--accent {
  border-color: var(--line-strong);
  background:
    linear-gradient(180deg, rgba(19, 39, 67, 0.95), rgba(9, 20, 35, 0.68)),
    radial-gradient(circle at top right, rgba(99, 179, 255, 0.18), transparent 30%);
}

.split-grid,
.comparison-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.split-side,
.comparison-card {
  padding: 1.35rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, rgba(13, 28, 47, 0.84), rgba(9, 20, 35, 0.62));
}

.split-side__label,
.comparison-card__label {
  display: inline-block;
  padding: 0.3rem 0.55rem;
  border-radius: 999px;
  font-family: "Space Grotesk", sans-serif;
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--primary);
  background: rgba(99, 179, 255, 0.08);
}

.split-side h3,
.comparison-card h3,
.quote-panel h3,
.ending-panel h3 {
  margin: 0.8rem 0 0.55rem;
  font-size: 1.14rem;
}

.quote-panel {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 1rem;
}

.quote-panel blockquote {
  margin: 0;
  padding-left: 1rem;
  border-left: 3px solid var(--primary);
  color: var(--text-main);
  font-size: 1.08rem;
  line-height: 1.76;
}

.process-line {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 0.9rem;
  align-items: stretch;
}

.flow-step {
  position: relative;
  padding: 1rem;
  cursor: pointer;
  transition:
    transform 180ms ease,
    border-color 180ms ease,
    background 180ms ease;
}

.flow-step:hover,
.flow-step.is-active {
  transform: translateY(-4px);
  border-color: var(--line-strong);
  background:
    linear-gradient(180deg, rgba(18, 40, 68, 0.98), rgba(9, 20, 35, 0.68)),
    radial-gradient(circle at top center, rgba(114, 255, 210, 0.12), transparent 45%);
}

.flow-step::after {
  content: "";
  position: absolute;
  top: 50%;
  right: -0.55rem;
  width: 0.95rem;
  height: 1px;
  background: linear-gradient(90deg, rgba(99, 179, 255, 0.3), rgba(99, 179, 255, 0));
}

.flow-step:last-child::after {
  display: none;
}

.flow-step__no {
  margin-bottom: 0.8rem;
  color: var(--accent);
  font-family: "Space Grotesk", sans-serif;
  letter-spacing: 0.16em;
}

.flow-inspector {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 1rem;
}

.flow-details-panel {
  padding: 1.4rem;
}

.flow-display {
  position: relative;
  overflow: hidden;
  padding: 1.4rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(circle at 75% 15%, rgba(99, 179, 255, 0.2), transparent 28%),
    linear-gradient(180deg, rgba(12, 26, 44, 0.82), rgba(9, 20, 35, 0.65));
}

.flow-display__label {
  color: var(--text-muted);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  font-size: 0.76rem;
}

.flow-display h3 {
  margin: 0.7rem 0 0.8rem;
  font-size: 1.16rem;
}

.flow-display p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.72;
}

.summary-conclusion {
  padding: 1.5rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-lg);
  background:
    linear-gradient(180deg, rgba(17, 38, 62, 0.96), rgba(9, 20, 35, 0.7)),
    radial-gradient(circle at top right, rgba(114, 255, 210, 0.14), transparent 35%);
}

.summary-conclusion strong {
  display: block;
  margin-top: 0.5rem;
  font-size: 1.14rem;
  line-height: 1.72;
}

.numbered-grid {
  display: grid;
  gap: 1rem;
}

.number-item {
  display: grid;
  grid-template-columns: 5rem 1fr;
  align-items: center;
  gap: 1rem;
}

.number-item__no {
  width: 4rem;
  height: 4rem;
  display: grid;
  place-items: center;
  border-radius: 1.2rem;
  border: 1px solid rgba(99, 179, 255, 0.3);
  background: rgba(99, 179, 255, 0.08);
  font-family: "Space Grotesk", sans-serif;
  color: var(--primary);
  font-size: 1.5rem;
}

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

.question-card {
  cursor: pointer;
  transition:
    transform 180ms ease,
    border-color 180ms ease,
    box-shadow 180ms ease;
}

.question-card:hover,
.question-card.is-active {
  transform: translateY(-4px);
  border-color: var(--line-strong);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.22);
}

.ending-panel {
  display: flex;
  flex-direction: column;
  justify-content: center;
  background:
    radial-gradient(circle at 80% 20%, rgba(99, 179, 255, 0.16), transparent 28%),
    linear-gradient(180deg, rgba(12, 26, 44, 0.82), rgba(9, 20, 35, 0.62));
}

.ending-lines {
  display: grid;
  gap: 0.9rem;
  margin-top: 1rem;
}

.ending-line {
  padding: 0.95rem 1rem;
  border: 1px solid rgba(114, 255, 210, 0.16);
  border-radius: 1rem;
  background: rgba(114, 255, 210, 0.05);
  color: var(--text-secondary);
}

.nav-button {
  width: clamp(2.9rem, 4vw, 3.8rem);
  height: clamp(2.9rem, 4vw, 3.8rem);
  flex: 0 0 auto;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: rgba(12, 24, 41, 0.72);
  cursor: pointer;
  transition:
    transform 180ms ease,
    border-color 180ms ease,
    background 180ms ease;
}

.nav-button:hover {
  transform: scale(1.04);
  border-color: var(--line-strong);
  background: rgba(18, 36, 61, 0.86);
}

.nav-button span {
  display: inline-block;
  width: 0.85rem;
  height: 0.85rem;
  border-top: 2px solid var(--text-main);
  border-right: 2px solid var(--text-main);
}

.nav-button--prev span {
  transform: rotate(-135deg);
  margin-left: 0.3rem;
}

.nav-button--next span {
  transform: rotate(45deg);
  margin-right: 0.3rem;
}

.side-panel {
  grid-column: 2 / 3;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  gap: 1rem;
  min-height: 0;
}

.progress-card {
  padding: 1rem 1.1rem;
}

.page-indicator {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  margin: 0.35rem 0 0.4rem;
}

.page-indicator strong {
  font-family: "Space Grotesk", sans-serif;
  font-size: 2.1rem;
}

.page-indicator span {
  color: var(--text-muted);
}

.progress-card p {
  margin: 0;
  color: var(--text-secondary);
  line-height: 1.55;
}

.page-nav {
  display: grid;
  gap: 0.7rem;
  overflow: auto;
  padding-right: 0.2rem;
}

.page-nav::-webkit-scrollbar {
  width: 6px;
}

.page-nav::-webkit-scrollbar-thumb {
  background: rgba(99, 179, 255, 0.22);
  border-radius: 999px;
}

.page-nav__item {
  width: 100%;
  padding: 0.8rem 0.95rem;
  text-align: left;
  cursor: pointer;
  transition:
    transform 180ms ease,
    border-color 180ms ease,
    background 180ms ease;
}

.page-nav__item:hover,
.page-nav__item.is-active {
  transform: translateX(-4px);
  border-color: var(--line-strong);
  background:
    linear-gradient(180deg, rgba(18, 40, 68, 0.95), rgba(9, 20, 35, 0.72)),
    radial-gradient(circle at right top, rgba(114, 255, 210, 0.1), transparent 40%);
}

.page-nav__index {
  display: inline-block;
  margin-bottom: 0.4rem;
  color: var(--primary);
  font-family: "Space Grotesk", sans-serif;
  font-size: 0.76rem;
  letter-spacing: 0.18em;
}

.page-nav__title {
  display: block;
  font-size: 0.9rem;
  line-height: 1.55;
  color: var(--text-main);
}

.footer-bar {
  grid-column: 1 / 3;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0 0.4rem;
}

.footer-bar__hint {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  color: var(--text-muted);
  font-size: 0.88rem;
}

.dot {
  width: 0.45rem;
  height: 0.45rem;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 6px rgba(114, 255, 210, 0.06);
}

@media (max-aspect-ratio: 1/1) {
  .orientation-tip {
    position: fixed;
    inset: 0;
    z-index: 10;
    display: grid;
    place-items: center;
    padding: 1.2rem;
    background: linear-gradient(180deg, rgba(4, 9, 20, 0.96), rgba(7, 17, 30, 0.98));
  }

  .orientation-tip__panel {
    width: min(100%, 28rem);
    padding: 1.8rem;
    border-radius: 1.5rem;
    border: 1px solid var(--line);
    background: rgba(12, 24, 41, 0.82);
    text-align: center;
  }

  .orientation-tip__label {
    color: var(--primary);
    font-family: "Space Grotesk", sans-serif;
    letter-spacing: 0.18em;
    font-size: 0.78rem;
  }

  .orientation-tip h1 {
    margin: 0.8rem 0 0.5rem;
  }

  .orientation-tip p {
    margin: 0;
    color: var(--text-secondary);
    line-height: 1.7;
  }
}

@media (max-width: 1366px) {
  .app-shell {
    grid-template-columns: minmax(0, 1fr) 22vw;
  }

  .slide {
    padding: 1.5rem;
  }

  .deck-title {
    font-size: clamp(1.35rem, 1.8vw, 2rem);
  }

  .slide-title {
    font-size: clamp(1.6rem, 2.2vw, 2.5rem);
  }

  .statement-box strong,
  .hero-highlight {
    font-size: clamp(1.28rem, 1.62vw, 1.96rem);
  }
}

@media (max-height: 820px) {
  .slide-title {
    font-size: clamp(1.45rem, 2vw, 2.2rem);
  }

  .slide-subtitle,
  .slide-purpose,
  .slide-footer-note,
  .slide-note,
  .card p,
  .card li,
  .comparison-card li,
  .split-side li,
  .question-card p,
  .number-item p,
  .flow-display p {
    font-size: 0.88rem;
  }

  .hero-highlight,
  .statement-box strong {
    font-size: clamp(1.18rem, 1.42vw, 1.74rem);
  }
}