:root {
  --bg: #0d1117;
  --card-bg: #161b22;
  --border: #30363d;
  --text-main: #f0f6fc;
  --text-muted: #8b949e;
  --accent: #58a6ff;
  --git-orange: #f05032;
  --green: #3fb950;
  --purple: #bc8cff;
  --yellow: #d29922;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  user-select: none;
}

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background-color: #010409;
  color: var(--text-main);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Fully responsive 16:9 viewport canvas with generous outer margins */
.slide-stage {
  position: relative;
  width: min(94vw, calc(94vh * 16 / 9));
  aspect-ratio: 16 / 9;
  container-type: inline-size;
  cursor: pointer;
  box-shadow: 0 24px 60px rgba(0,0,0,0.85);
  border-radius: 14px;
  border: 1px solid var(--border);
  background-color: var(--bg);
}

.slide {
  width: 100%;
  height: 100%;
  background-color: var(--bg);
  border-radius: 14px;
  display: none;
  flex-direction: column;
  justify-content: space-between;
  padding: 3.8cqw 5cqw;
  position: absolute;
  inset: 0;
  overflow: hidden;
}

.slide.active {
  display: flex;
}

/* Fluid Header & Footer */
.slide-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  border-bottom: 1px solid rgba(48, 54, 61, 0.7);
  padding-bottom: 1.2cqw;
  height: 4.8cqw;
}

.slide-header h2 {
  font-size: clamp(20px, 2.4cqw, 36px);
  font-weight: 600;
  letter-spacing: -0.5px;
  color: var(--text-main);
}

.slide-header .tag {
  font-size: clamp(11px, 1.2cqw, 16px);
  font-family: ui-monospace, SFMono-Regular, monospace;
  color: var(--accent);
  background: rgba(88, 166, 255, 0.12);
  padding: 0.35cqw 0.9cqw;
  border-radius: 6px;
  border: 1px solid rgba(88, 166, 255, 0.3);
}

.slide-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid rgba(48, 54, 61, 0.7);
  padding-top: 1.2cqw;
  font-size: clamp(11px, 1.2cqw, 16px);
  color: var(--text-muted);
  height: 3.8cqw;
}

.slide-body {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.2cqw 0;
  position: relative;
}

/* Slide 1: Title */
.title-content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  height: 100%;
  width: 100%;
}

.title-meta {
  font-family: ui-monospace, monospace;
  font-size: clamp(14px, 1.6cqw, 24px);
  color: var(--accent);
  letter-spacing: 2px;
  margin-bottom: 1.5cqw;
}

.title-main {
  font-size: clamp(38px, 5.4cqw, 78px);
  font-weight: 800;
  letter-spacing: -1.5px;
  line-height: 1.1;
  margin-bottom: 1.6cqw;
  background: linear-gradient(135deg, #ffffff 30%, #8b949e 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.title-sub {
  font-size: clamp(18px, 2.3cqw, 32px);
  color: var(--text-muted);
  font-weight: 400;
}

/* Comparison / Before-After Grids */
.horror-grid {
  display: grid;
  grid-template-columns: 1fr 4cqw 1fr;
  width: 100%;
  height: 100%;
  max-height: 28cqw;
  align-items: center;
  gap: 1.5cqw;
}

.card-pane {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.8cqw;
  height: 100%;
  display: flex;
  flex-direction: column;
}

.card-pane.empty-slot {
  border: 2px dashed #21262d;
  background: transparent;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #30363d;
  font-family: ui-monospace, monospace;
  font-size: clamp(12px, 1.4cqw, 18px);
}

.pane-header {
  font-size: clamp(12px, 1.3cqw, 18px);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 1.2cqw;
  display: flex;
  align-items: center;
  gap: 0.8cqw;
}

.file-list {
  font-family: ui-monospace, SFMono-Regular, monospace;
  font-size: clamp(12px, 1.25cqw, 17px);
  display: flex;
  flex-direction: column;
  gap: 0.7cqw;
}

.file-item {
  padding: 0.65cqw 1cqw;
  border-radius: 6px;
  background: #0d1117;
  border: 1px solid var(--border);
}

.file-item.danger {
  color: #ff7b72;
  border-color: rgba(255, 123, 114, 0.35);
  background: rgba(255, 123, 114, 0.06);
}

.file-item.good {
  color: var(--green);
  border-color: rgba(63, 185, 80, 0.35);
  background: rgba(63, 185, 80, 0.06);
  display: flex;
  justify-content: space-between;
}

/* Two-column Comparison */
.compare-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  width: 100%;
  height: 100%;
  max-height: 28cqw;
  gap: 3cqw;
}

.compare-col {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 2cqw 2.5cqw;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 1.4cqw;
}

.brand-logo {
  width: 6.2cqw;
  height: 6.2cqw;
  display: flex;
  align-items: center;
  justify-content: center;
}

.brand-logo svg {
  width: 100%;
  height: 100%;
}

.brand-title {
  font-size: clamp(22px, 2.6cqw, 36px);
  font-weight: 700;
}

.concept-pill {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  padding: 0.9cqw 1.8cqw;
  border-radius: 8px;
  width: 100%;
  height: 5.8cqw;
  display: flex;
  flex-direction: column;
  justify-content: center;
  font-size: clamp(12px, 1.3cqw, 18px);
  color: var(--text-muted);
}

.concept-pill.ghost {
  visibility: hidden;
}

.concept-pill strong {
  color: var(--text-main);
  display: block;
  margin-bottom: 2px;
  font-size: clamp(14px, 1.5cqw, 20px);
}

/* SVG Boards */
.svg-board {
  width: 100%;
  height: 100%;
  max-height: 28cqw;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.svg-board svg {
  width: 100%;
  height: 100%;
  overflow: visible;
}

/* Three Stages / Workflow Diagram */
.stages-diagram {
  display: flex;
  width: 100%;
  height: 100%;
  max-height: 28cqw;
  align-items: center;
  justify-content: space-between;
  gap: 1.2cqw;
}

.stage-box {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 14px;
  flex: 1;
  height: 100%;
  padding: 1.8cqw;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  justify-content: space-between;
}

.stage-box.ghost {
  visibility: hidden;
}

.stage-title {
  font-size: clamp(15px, 1.7cqw, 24px);
  font-weight: 700;
}

.stage-icon {
  width: 5.2cqw;
  height: 5.2cqw;
}

.stage-cue {
  font-size: clamp(11px, 1.2cqw, 16px);
  color: var(--text-muted);
  line-height: 1.35;
}

.stage-cmd-box {
  font-family: ui-monospace, monospace;
  background: #000000;
  border: 2px solid var(--accent);
  color: #ffffff;
  padding: 0.7cqw 1.2cqw;
  border-radius: 8px;
  font-size: clamp(12px, 1.3cqw, 18px);
  font-weight: 700;
  box-shadow: 0 4px 14px rgba(88, 166, 255, 0.25);
  white-space: nowrap;
}

.trans-arrow {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.8cqw;
  width: 9cqw;
  visibility: hidden;
}

.trans-arrow.visible {
  visibility: visible;
}

/* Rules Grid */
.rules-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  width: 100%;
  height: 100%;
  max-height: 28cqw;
  gap: 2.2cqw;
}

.rule-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 2.5cqw 1.8cqw;
  text-align: center;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  height: 100%;
}

.rule-card.ghost {
  visibility: hidden;
}

.rule-number {
  font-size: clamp(12px, 1.3cqw, 18px);
  font-family: ui-monospace, monospace;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 1.4cqw;
}

.rule-heading {
  font-size: clamp(20px, 2.4cqw, 36px);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.5px;
}

/* Practice / Interactive Session */
.practice-box {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 14px;
  width: 100%;
  height: 100%;
  max-height: 28cqw;
  padding: 2.4cqw 3cqw;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.practice-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.2cqw;
}

.p-step {
  background: #0d1117;
  border: 1px solid var(--border);
  padding: 1.4cqw;
  border-radius: 8px;
  font-size: clamp(11px, 1.2cqw, 16px);
  line-height: 1.4;
}

.p-step span {
  display: block;
  font-family: ui-monospace, monospace;
  font-size: clamp(10px, 1.1cqw, 14px);
  color: var(--accent);
  margin-bottom: 0.5cqw;
}

.portal-link {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(88, 166, 255, 0.08);
  border: 1px solid rgba(88, 166, 255, 0.3);
  padding: 1.4cqw 2.2cqw;
  border-radius: 8px;
}

.portal-url {
  font-family: ui-monospace, monospace;
  font-size: clamp(16px, 1.8cqw, 26px);
  color: #58a6ff;
  font-weight: 700;
}