:root {
  --bg: #09131d;
  --bg-deep: #050c14;
  --bg-panel: rgba(13, 26, 39, 0.82);
  --bg-panel-strong: rgba(17, 34, 49, 0.96);
  --bg-card: rgba(241, 245, 249, 0.06);
  --bg-card-strong: rgba(241, 245, 249, 0.1);
  --ink: #f7f4ef;
  --ink-soft: #c5d1db;
  --ink-dim: #91a3b4;
  --line: rgba(154, 175, 195, 0.18);
  --accent: #d86f45;
  --accent-soft: rgba(216, 111, 69, 0.16);
  --accent-bright: #f4ab83;
  --accent-cool: #7fb0cf;
  --danger-soft: rgba(195, 92, 92, 0.14);
  --success-soft: rgba(95, 164, 131, 0.16);
  --shadow-lg: 0 30px 80px rgba(0, 0, 0, 0.34);
  --shadow-md: 0 18px 40px rgba(0, 0, 0, 0.24);
  --radius-lg: 28px;
  --radius-md: 20px;
  --radius-sm: 14px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Avenir Next", "Segoe UI", "Noto Sans TC", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(216, 111, 69, 0.24), transparent 22%),
    radial-gradient(circle at 85% 12%, rgba(127, 176, 207, 0.18), transparent 18%),
    linear-gradient(180deg, #112435 0%, #0a1420 42%, #07111a 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(rgba(255, 255, 255, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.025) 1px, transparent 1px);
  background-size: 24px 24px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.35), transparent 85%);
  opacity: 0.45;
}

button,
a {
  font: inherit;
}

.page-shell {
  position: relative;
  display: grid;
  grid-template-columns: 290px minmax(0, 1fr);
  gap: 28px;
  max-width: 1520px;
  margin: 0 auto;
  padding: 26px;
}

.toc-panel {
  position: sticky;
  top: 18px;
  align-self: start;
}

.toc-card,
.hero,
.slide-section {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--bg-panel);
  backdrop-filter: blur(18px);
  box-shadow: var(--shadow-lg);
}

.toc-card {
  padding: 22px 20px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent-bright);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.toc-card h2,
.hero h1,
.section-heading h2,
.info-card h3,
.compare-card h3,
.bmc-card h3,
.step-card h3 {
  margin: 0;
  font-weight: 600;
  letter-spacing: -0.03em;
}

.toc-summary,
.hero-text,
.section-heading p,
.info-card p,
.compare-card p,
.bmc-card p,
.step-card p,
.number-list,
.info-card li {
  color: var(--ink-soft);
}

.toc-nav {
  display: grid;
  gap: 10px;
  margin-top: 18px;
}

.toc-nav a {
  display: block;
  padding: 12px 14px;
  border-radius: 14px;
  color: var(--ink-soft);
  text-decoration: none;
  border: 1px solid transparent;
  background: transparent;
  transition: 160ms ease;
}

.toc-nav a:hover,
.toc-nav a[aria-current="true"] {
  color: var(--ink);
  border-color: rgba(244, 171, 131, 0.18);
  background: linear-gradient(90deg, rgba(216, 111, 69, 0.18), rgba(216, 111, 69, 0.04));
}

.content-shell {
  min-width: 0;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) minmax(320px, 0.95fr);
  gap: 24px;
  padding: 34px;
  margin-bottom: 22px;
  background:
    linear-gradient(135deg, rgba(11, 25, 39, 0.95), rgba(21, 47, 65, 0.82)),
    var(--bg-panel);
}

.hero-copy h1 {
  max-width: 10ch;
  font-size: clamp(2.7rem, 4.4vw, 5rem);
  line-height: 0.98;
}

.hero-text {
  max-width: 62ch;
  margin: 18px 0 24px;
  font-size: 1.04rem;
  line-height: 1.78;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.hero-meta span {
  padding: 10px 14px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.05);
  color: var(--ink-soft);
  font-size: 0.92rem;
}

.hero-tools {
  display: grid;
  gap: 16px;
  align-content: start;
}

.mode-group,
.deck-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.mode-button,
.control-button {
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.04);
  color: var(--ink-soft);
  border-radius: 999px;
  padding: 11px 16px;
  cursor: pointer;
  transition: 160ms ease;
}

.mode-button:hover,
.control-button:hover,
.mode-button.is-current {
  color: var(--ink);
  border-color: rgba(244, 171, 131, 0.26);
  background: linear-gradient(90deg, rgba(216, 111, 69, 0.22), rgba(216, 111, 69, 0.08));
}

.slide-status {
  padding: 18px 20px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-md);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.03));
}

.slide-counter {
  display: flex;
  align-items: baseline;
  gap: 8px;
  color: var(--ink);
  font-size: 1.08rem;
  font-weight: 600;
  letter-spacing: 0.06em;
}

.slide-progress {
  margin-top: 14px;
  height: 10px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  overflow: hidden;
}

.slide-progress span {
  display: block;
  width: 9%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent-bright), var(--accent));
  box-shadow: 0 0 24px rgba(216, 111, 69, 0.32);
}

#course-content {
  display: grid;
  gap: 22px;
}

.slide-section {
  position: relative;
  overflow: hidden;
  padding: 34px;
}

.slide-section::after {
  content: "";
  position: absolute;
  inset: auto -10% -22% auto;
  width: 280px;
  height: 280px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(216, 111, 69, 0.12), transparent 68%);
  pointer-events: none;
}

.section-heading {
  position: relative;
  z-index: 1;
  max-width: 76ch;
}

.section-heading h2 {
  margin-bottom: 12px;
  font-size: clamp(2.1rem, 3vw, 3.5rem);
  line-height: 1.05;
}

.section-heading p {
  margin: 0 0 22px;
  font-size: 1.03rem;
  line-height: 1.8;
}

.keyword-accent {
  color: var(--accent-bright);
}

.speaker-section {
  min-height: 640px;
  background:
    radial-gradient(circle at 18% 18%, rgba(216, 111, 69, 0.16), transparent 24%),
    radial-gradient(circle at 82% 78%, rgba(127, 176, 207, 0.1), transparent 28%),
    linear-gradient(180deg, rgba(8, 19, 30, 0.95), rgba(9, 19, 29, 0.92));
}

.speaker-spotlight {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  min-height: 540px;
}

.speaker-copy {
  display: grid;
  grid-template-columns: minmax(320px, 0.96fr) minmax(360px, 1.04fr);
  gap: 56px;
  align-content: center;
  align-items: center;
  max-width: 100%;
  min-height: 540px;
}

.speaker-hero {
  display: grid;
  align-content: center;
}

.speaker-details {
  display: grid;
  align-content: center;
  padding-top: 0;
}

.speaker-name-row {
  margin: 14px 0 12px;
}

.speaker-label {
  display: inline-flex;
  align-items: center;
  width: max-content;
  padding: 9px 13px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.1);
  color: var(--ink);
  font-size: 0.96rem;
  font-weight: 700;
}

.speaker-name-row h2 {
  max-width: 10ch;
  font-size: clamp(3.4rem, 7.4vw, 6.6rem);
  line-height: 0.92;
  text-wrap: balance;
}

.speaker-role {
  max-width: 28ch;
  margin: 0 0 12px;
  color: var(--accent-bright);
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.45;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.speaker-tagline {
  max-width: 24ch;
  margin: 0 0 22px;
  color: var(--ink);
  font-size: clamp(1.32rem, 2.2vw, 2rem);
  font-weight: 600;
  line-height: 1.32;
  text-wrap: pretty;
}

.speaker-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  max-width: 56ch;
  margin-bottom: 22px;
}

.speaker-pill {
  display: inline-flex;
  align-items: center;
  padding: 10px 14px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.05);
  color: var(--ink-soft);
  font-size: 0.92rem;
  line-height: 1.2;
}

.speaker-highlights {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  max-width: none;
}

.speaker-highlight {
  display: grid;
  gap: 12px;
  align-items: start;
  min-height: 100%;
  padding: 18px 18px 20px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 22px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.07), rgba(255, 255, 255, 0.04));
  box-shadow: var(--shadow-md);
}

.highlight-kicker {
  color: var(--accent-bright);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
}

.speaker-highlight p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 1rem;
  line-height: 1.66;
  text-wrap: pretty;
}

.compact-layout .card-grid,
.compact-layout .comparison-grid,
.compact-layout .triple-grid,
.compact-layout .exercise-layout {
  gap: 14px;
}

.compact-layout .full-width {
  margin-top: 14px;
}

.slide-watermark {
  position: absolute;
  top: 24px;
  right: 28px;
  z-index: 2;
  display: grid;
  justify-items: end;
  gap: 3px;
  max-width: min(320px, 32vw);
  color: rgba(247, 244, 239, 0.22);
  font-size: 0.72rem;
  line-height: 1.35;
  letter-spacing: 0.04em;
  text-align: right;
  pointer-events: none;
}

.slide-watermark span:first-child {
  color: rgba(244, 171, 131, 0.34);
  font-weight: 600;
}

.card-grid,
.comparison-grid,
.triple-grid,
.exercise-layout {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 18px;
  margin-top: 22px;
}

.card-grid,
.comparison-grid,
.exercise-layout {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

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

.info-card,
.compare-card,
.step-card,
.bmc-card {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 22px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.04));
  box-shadow: var(--shadow-md);
}

.info-card h3,
.compare-card h3,
.step-card h3,
.bmc-card h3 {
  margin-bottom: 10px;
  color: var(--ink);
}

.accent-card {
  background: linear-gradient(180deg, rgba(216, 111, 69, 0.2), rgba(216, 111, 69, 0.08));
  border-color: rgba(244, 171, 131, 0.2);
}

.full-width {
  grid-column: 1 / -1;
}

.label-pill {
  display: inline-flex;
  margin-bottom: 12px;
  padding: 6px 10px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  color: var(--ink-dim);
  font-size: 0.77rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.compare-card.bad {
  background: linear-gradient(180deg, var(--danger-soft), rgba(255, 255, 255, 0.04));
}

.compare-card.good {
  background: linear-gradient(180deg, var(--success-soft), rgba(255, 255, 255, 0.05));
}

.quote-block {
  position: relative;
  z-index: 1;
  margin: 26px 0 0;
  padding: 22px 24px 22px 26px;
  border-left: 4px solid var(--accent);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  background: linear-gradient(90deg, rgba(216, 111, 69, 0.12), rgba(255, 255, 255, 0.04));
  color: var(--ink);
  font-size: 1.12rem;
  font-weight: 500;
  line-height: 1.75;
}

.number-list {
  margin: 0;
  padding-left: 1.2rem;
  display: grid;
  gap: 10px;
  line-height: 1.75;
}

.bmc-canvas {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(10, minmax(0, 1fr));
  gap: 14px;
  margin-top: 26px;
}

.bmc-column-stack {
  display: grid;
  grid-column: span 2;
  gap: 14px;
}

.bmc-panel {
  min-height: 170px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background:
    linear-gradient(180deg, rgba(127, 176, 207, 0.08), rgba(255, 255, 255, 0.04)),
    rgba(255, 255, 255, 0.04);
  box-shadow: var(--shadow-md);
}

.bmc-panel h3 {
  margin: 0 0 10px;
  color: var(--ink);
}

.bmc-panel p {
  margin: 0;
  color: var(--ink-soft);
}

.bmc-panel-tall {
  grid-column: span 2;
  min-height: 354px;
}

.bmc-panel-focus {
  grid-column: span 2;
  min-height: 354px;
  border-color: rgba(244, 171, 131, 0.24);
  background:
    linear-gradient(180deg, rgba(216, 111, 69, 0.18), rgba(255, 255, 255, 0.05)),
    rgba(255, 255, 255, 0.05);
}

.bmc-panel-wide {
  grid-column: span 5;
  min-height: 140px;
}

.flow-steps {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  margin-top: 26px;
}

.step-card span {
  display: inline-grid;
  place-items: center;
  width: 42px;
  height: 42px;
  margin-bottom: 18px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-bright), var(--accent));
  color: var(--bg);
  font-weight: 700;
}

.pitch-outline li {
  padding-left: 6px;
}

.slide-mode {
  overflow: hidden;
}

.slide-mode .page-shell {
  grid-template-columns: 1fr;
  max-width: none;
  min-height: 100vh;
  padding: 0;
}

.slide-mode .toc-panel {
  position: fixed;
  top: 24px;
  left: 24px;
  z-index: 30;
  width: min(340px, calc(100vw - 48px));
  transform: translateX(-115%);
  transition: transform 180ms ease;
}

.slide-mode.show-toc .toc-panel {
  transform: translateX(0);
}

.slide-mode .toc-card {
  background: var(--bg-panel-strong);
}

.slide-mode .content-shell {
  padding: 22px;
}

.slide-mode .hero {
  position: static;
  display: block;
  padding: 0;
  margin-bottom: 0;
  background: transparent;
  border: 0;
  box-shadow: none;
  backdrop-filter: none;
}

.slide-mode .hero-copy {
  display: none;
}

.slide-mode .hero-tools {
  position: fixed;
  left: 50%;
  bottom: 12px;
  transform: translateX(-50%);
  z-index: 26;
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  width: min(520px, calc(100vw - 24px));
  gap: 8px;
  padding: 8px 10px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 999px;
  background: rgba(7, 17, 26, 0.56);
  backdrop-filter: blur(14px);
  box-shadow: var(--shadow-md);
}

.slide-mode .mode-group {
  display: none;
}

.slide-mode .deck-controls {
  gap: 6px;
  padding: 0;
  justify-content: flex-start;
  background: transparent;
}

.slide-mode .slide-status {
  margin-top: 0;
  padding: 0 0 0 8px;
  border-left: 1px solid rgba(255, 255, 255, 0.08);
  background: transparent;
  opacity: 0.68;
}

.slide-mode .control-button {
  padding: 6px 10px;
  font-size: 0.8rem;
  opacity: 0.68;
}

.slide-mode .control-button:hover {
  opacity: 0.92;
}

.slide-mode [data-action="toc"] {
  display: none;
}

.slide-mode .hero-copy h1 {
  max-width: 100%;
  font-size: clamp(1.7rem, 3vw, 2.6rem);
  font-weight: 600;
}

.slide-mode .hero-text,
.slide-mode .hero-meta {
  display: none;
}

.slide-mode #course-content {
  min-height: calc(100vh - 166px);
}

.slide-mode .slide-section {
  display: none;
  min-height: calc(100vh - 188px);
  padding: 42px;
  background:
    radial-gradient(circle at top right, rgba(216, 111, 69, 0.12), transparent 24%),
    linear-gradient(180deg, rgba(8, 19, 30, 0.94), rgba(11, 24, 37, 0.92));
}

.slide-mode .slide-section.is-active-slide {
  display: block;
}

.slide-mode .speaker-section {
  padding: 34px 42px 104px;
}

.slide-mode .speaker-copy {
  grid-template-columns: minmax(300px, 0.92fr) minmax(420px, 1.08fr);
  gap: 48px;
  max-width: 100%;
  min-height: auto;
  align-content: center;
  padding-top: 18px;
}

.slide-mode .speaker-name-row {
  margin: 12px 0 10px;
}

.slide-mode .speaker-name-row h2 {
  max-width: 8.5ch;
  font-size: clamp(2.7rem, 5.4vw, 4.9rem);
}

.slide-mode .speaker-role {
  margin-bottom: 10px;
  font-size: 0.9rem;
}

.slide-mode .speaker-tagline {
  max-width: 20ch;
  margin-bottom: 18px;
  font-size: clamp(1.06rem, 1.8vw, 1.56rem);
}

.slide-mode .speaker-pills {
  gap: 8px;
  margin-bottom: 18px;
}

.slide-mode .speaker-pill {
  padding: 8px 12px;
  font-size: 0.82rem;
}

.slide-mode .speaker-highlights {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.slide-mode .speaker-highlight {
  padding: 14px 14px 16px;
}

.slide-mode .speaker-highlight p {
  font-size: 0.92rem;
  line-height: 1.52;
}

.slide-mode .slide-watermark {
  top: 24px;
  right: 28px;
  max-width: min(320px, 36vw);
  color: rgba(247, 244, 239, 0.3);
}

.slide-mode .slide-watermark span:first-child {
  color: rgba(244, 171, 131, 0.42);
}

.is-active-slide {
  outline: 1px solid rgba(244, 171, 131, 0.22);
  box-shadow: 0 0 0 1px rgba(244, 171, 131, 0.08), var(--shadow-lg);
}

.slide-mode .section-heading {
  max-width: 90ch;
}

.slide-mode .section-heading h2 {
  font-size: clamp(2.3rem, 4.2vw, 4.2rem);
  font-weight: 600;
}

.slide-mode .section-heading p,
.slide-mode .info-card p,
.slide-mode .compare-card p,
.slide-mode .bmc-panel p,
.slide-mode li {
  font-size: 1.04rem;
}

@media (max-width: 1200px) {
  .page-shell {
    grid-template-columns: 1fr;
  }

  .toc-panel {
    position: relative;
    top: auto;
  }

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

@media (max-width: 900px) {
  .page-shell {
    padding: 16px;
    gap: 16px;
  }

  .slide-section,
  .hero,
  .toc-card {
    padding: 22px;
  }

  .card-grid,
  .comparison-grid,
  .triple-grid,
  .exercise-layout,
  .flow-steps,
  .bmc-canvas {
    grid-template-columns: 1fr;
  }

  .bmc-column-stack,
  .bmc-panel-tall,
  .bmc-panel-focus,
  .bmc-panel-wide {
    grid-column: auto;
  }

  .hero-copy h1 {
    max-width: 100%;
    font-size: clamp(2.2rem, 10vw, 3.6rem);
  }

  .speaker-spotlight {
    grid-template-columns: 1fr;
    min-height: auto;
  }

  .speaker-copy {
    grid-template-columns: 1fr;
    min-height: auto;
  }

  .speaker-details {
    padding-top: 0;
  }

  .speaker-name-row h2 {
    max-width: 100%;
    font-size: clamp(2.9rem, 11vw, 4.4rem);
  }

  .speaker-tagline {
    max-width: 100%;
    font-size: 1.18rem;
  }

  .speaker-highlights {
    grid-template-columns: 1fr;
  }

  .slide-mode .speaker-section {
    padding: 26px 22px 96px;
  }

  .slide-mode .speaker-copy {
    padding-top: 10px;
  }

  .slide-mode .hero {
    display: block;
  }

  .slide-mode .slide-section {
    min-height: auto;
    padding: 26px 22px;
  }

  .slide-mode .hero-tools {
    left: 50%;
    bottom: 10px;
    transform: translateX(-50%);
    width: calc(100vw - 24px);
  }
}