/* ═══════════════════════════════════════════════════════
   DESIGN SYSTEM — Alpine Frost × Editorial
   Palette: #E3EDF7 · #A8C4E0 · #2E5090 · #0A1929
   Fonts: Plus Jakarta Sans + Source Serif 4
═══════════════════════════════════════════════════════ */

:root {
  --frost:       #E3EDF7;
  --mist:        #A8C4E0;
  --navy:        #2E5090;
  --deep:        #0A1929;
  --white:       #FFFFFF;
  --slate:       #4A6080;
  --light-slate: #8FA8C0;
  --accent:      #1A6FBF;
  --accent-glow: rgba(46, 80, 144, 0.18);
  --red-soft:    #E05555;
  --green-soft:  #2E9E6B;

  --font-display: 'Plus Jakarta Sans', sans-serif;
  --font-body:    'Source Serif 4', serif;

  --slide-w: 100vw;
  --slide-h: 100vh;

  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out:   cubic-bezier(0.4, 0, 0.2, 1);
}

/* ─── RESET & BASE ─────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  width: 100%; height: 100%;
  overflow: hidden;
  background: var(--deep);
  font-family: var(--font-body);
  color: var(--deep);
  -webkit-font-smoothing: antialiased;
}

/* ─── PROGRESS BAR ─────────────────────────────────── */
.progress-bar-container {
  position: fixed; top: 0; left: 0; right: 0;
  height: 3px; z-index: 100;
  background: rgba(168, 196, 224, 0.2);
}
.progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--navy), var(--mist));
  transition: width 0.5s var(--ease-out-expo);
  width: 10%;
}

/* ─── SLIDE COUNTER ────────────────────────────────── */
.slide-counter {
  position: fixed; top: 20px; right: 24px;
  font-family: var(--font-display);
  font-size: 12px; font-weight: 600;
  color: var(--mist);
  letter-spacing: 0.08em;
  z-index: 100;
  background: rgba(10, 25, 41, 0.6);
  backdrop-filter: blur(8px);
  padding: 6px 14px; border-radius: 20px;
  border: 1px solid rgba(168, 196, 224, 0.2);
}
.slide-counter .divider { opacity: 0.4; margin: 0 4px; }

/* ─── DOT NAVIGATION ───────────────────────────────── */
.dot-nav {
  position: fixed; bottom: 28px; left: 50%;
  transform: translateX(-50%);
  display: flex; gap: 8px; align-items: center;
  z-index: 100;
  background: rgba(10, 25, 41, 0.5);
  backdrop-filter: blur(8px);
  padding: 8px 16px; border-radius: 30px;
  border: 1px solid rgba(168, 196, 224, 0.15);
}
.dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: rgba(168, 196, 224, 0.35);
  cursor: pointer;
  transition: all 0.3s var(--ease-out-expo);
  border: none;
}
.dot.active {
  background: var(--mist);
  width: 22px; border-radius: 4px;
}
.dot:hover:not(.active) { background: rgba(168, 196, 224, 0.6); }

/* ─── NAV ARROWS ───────────────────────────────────── */
.nav-btn {
  position: fixed; top: 50%; transform: translateY(-50%);
  width: 44px; height: 44px;
  background: rgba(10, 25, 41, 0.55);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(168, 196, 224, 0.2);
  border-radius: 50%;
  color: var(--mist);
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  z-index: 100;
  transition: all 0.25s var(--ease-out-expo);
}
.nav-btn svg { width: 18px; height: 18px; }
.nav-btn:hover {
  background: rgba(46, 80, 144, 0.7);
  border-color: var(--mist);
  color: var(--white);
  transform: translateY(-50%) scale(1.08);
}
.nav-btn:disabled { opacity: 0.25; pointer-events: none; }
.nav-prev { left: 20px; }
.nav-next { right: 20px; }

/* ─── KEYBOARD HINT ────────────────────────────────── */
.keyboard-hint {
  position: fixed; bottom: 72px; left: 50%;
  transform: translateX(-50%);
  font-family: var(--font-display);
  font-size: 11px; color: rgba(168, 196, 224, 0.5);
  display: flex; align-items: center; gap: 6px;
  z-index: 99;
  transition: opacity 0.5s;
}
.keyboard-hint svg { width: 14px; height: 14px; }
.keyboard-hint.hidden { opacity: 0; pointer-events: none; }

/* ─── SLIDES WRAPPER ───────────────────────────────── */
.slides-wrapper {
  width: 100vw; height: 100vh;
  position: relative; overflow: hidden;
}

/* ─── SLIDE BASE ───────────────────────────────────── */
.slide {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  display: flex; flex-direction: column;
  padding: 52px 72px 80px;
  opacity: 0;
  pointer-events: none;
  transform: translateX(60px);
  transition: opacity 0.55s var(--ease-out-expo),
              transform 0.55s var(--ease-out-expo);
  overflow: hidden;
}
.slide.active {
  opacity: 1;
  pointer-events: all;
  transform: translateX(0);
}
.slide.exit {
  opacity: 0;
  transform: translateX(-60px);
  pointer-events: none;
}

/* ─── BACKGROUND GRID ──────────────────────────────── */
.slide-bg-grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(168, 196, 224, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(168, 196, 224, 0.06) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
}

/* ─── ANIMATE ITEMS ────────────────────────────────── */
.animate-item {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.5s var(--ease-out-expo),
              transform 0.5s var(--ease-out-expo);
  transition-delay: var(--delay, 0s);
}
.slide.active .animate-item {
  opacity: 1;
  transform: translateY(0);
}

/* ═══════════════════════════════════════════════════
   SLIDE 1 — TITLE
═══════════════════════════════════════════════════ */
.slide-title {
  background: linear-gradient(135deg, var(--deep) 0%, #0D2240 50%, #122B50 100%);
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
}

/* Orbs */
.title-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  pointer-events: none;
}
.orb-1 {
  width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(46,80,144,0.35) 0%, transparent 70%);
  top: -150px; left: -100px;
}
.orb-2 {
  width: 350px; height: 350px;
  background: radial-gradient(circle, rgba(168,196,224,0.15) 0%, transparent 70%);
  bottom: -80px; right: 200px;
}
.orb-3 {
  width: 250px; height: 250px;
  background: radial-gradient(circle, rgba(26,111,191,0.2) 0%, transparent 70%);
  top: 50%; right: 80px;
}

.title-content {
  flex: 1;
  display: flex; flex-direction: column;
  gap: 20px;
  position: relative; z-index: 2;
}

.title-eyebrow {
  font-family: var(--font-display);
  font-size: 12px; font-weight: 600;
  letter-spacing: 0.2em; text-transform: uppercase;
  color: var(--mist);
  display: flex; align-items: center; gap: 10px;
}
.title-eyebrow::before {
  content: '';
  display: block; width: 32px; height: 2px;
  background: var(--navy);
}

.title-main {
  font-family: var(--font-display);
  font-size: clamp(42px, 5.5vw, 72px);
  font-weight: 800;
  line-height: 1.05;
  color: var(--white);
  letter-spacing: -0.02em;
}
.title-main .amp {
  color: var(--mist);
  font-style: italic;
  font-weight: 300;
}

.title-divider {
  width: 60px; height: 3px;
  background: linear-gradient(90deg, var(--navy), var(--mist));
  border-radius: 2px;
}

.title-meta {
  display: flex; flex-direction: column; gap: 10px;
}
.meta-row {
  display: flex; align-items: center; gap: 14px;
  font-family: var(--font-display);
  font-size: 13px;
}
.meta-label {
  color: var(--light-slate);
  font-weight: 500;
  min-width: 90px;
  letter-spacing: 0.05em;
}
.meta-value {
  color: var(--frost);
  font-weight: 600;
}

.title-badge {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-display);
  font-size: 11px; font-weight: 600;
  letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--mist);
  border: 1px solid rgba(168, 196, 224, 0.3);
  padding: 8px 16px; border-radius: 20px;
  width: fit-content;
  background: rgba(46, 80, 144, 0.15);
}
.title-badge svg { width: 14px; height: 14px; }

/* Title Visual */
.title-visual {
  width: 340px; height: 340px;
  position: relative; flex-shrink: 0;
  z-index: 2;
}
.data-ring {
  position: absolute; border-radius: 50%;
  border: 1px solid rgba(168, 196, 224, 0.2);
  top: 50%; left: 50%; transform: translate(-50%, -50%);
}
.ring-outer { width: 320px; height: 320px; animation: spin 30s linear infinite; }
.ring-mid   { width: 230px; height: 230px; animation: spin 20s linear infinite reverse; border-style: dashed; }
.ring-inner { width: 140px; height: 140px; animation: spin 12s linear infinite; }

@keyframes spin { to { transform: translate(-50%, -50%) rotate(360deg); } }

.data-nodes { position: absolute; inset: 0; }
.node {
  position: absolute; width: 10px; height: 10px;
  border-radius: 50%; background: var(--navy);
  border: 2px solid var(--mist);
}
.n1 { top: 10px; left: 50%; transform: translateX(-50%); animation: pulse 2s ease-in-out infinite; }
.n2 { top: 25%; right: 8px; animation: pulse 2s ease-in-out infinite 0.3s; }
.n3 { bottom: 25%; right: 8px; animation: pulse 2s ease-in-out infinite 0.6s; }
.n4 { bottom: 10px; left: 50%; transform: translateX(-50%); animation: pulse 2s ease-in-out infinite 0.9s; }
.n5 { bottom: 25%; left: 8px; animation: pulse 2s ease-in-out infinite 1.2s; }
.n6 { top: 25%; left: 8px; animation: pulse 2s ease-in-out infinite 1.5s; }

@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 0.7; }
  50% { transform: scale(1.5); opacity: 1; }
}
.n1, .n4 { transform: translateX(-50%); }

.data-center-icon {
  position: absolute; top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  width: 80px; height: 80px;
  background: linear-gradient(135deg, var(--navy), var(--accent));
  border-radius: 20px;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 0 40px rgba(46, 80, 144, 0.5);
}
.data-center-icon svg { width: 44px; height: 44px; stroke: var(--frost); }

/* ═══════════════════════════════════════════════════
   SLIDE HEADER (shared)
═══════════════════════════════════════════════════ */
.slide-content {
  background: linear-gradient(160deg, var(--frost) 0%, #D0DFF0 100%);
}

.slide-header {
  display: flex; align-items: center; gap: 16px;
  margin-bottom: 28px; flex-shrink: 0;
}
.slide-number-tag {
  font-family: var(--font-display);
  font-size: 11px; font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--white);
  background: var(--navy);
  padding: 4px 10px; border-radius: 4px;
}
.slide-header .slide-title {
  font-family: var(--font-display);
  font-size: clamp(22px, 2.8vw, 36px);
  font-weight: 800;
  color: var(--deep);
  letter-spacing: -0.02em;
  flex: 1;
}
.slide-title-line {
  height: 2px; flex: 1;
  background: linear-gradient(90deg, var(--navy), transparent);
  opacity: 0.3;
}

/* ═══════════════════════════════════════════════════
   SLIDE 2 — TWO COLUMN CARDS
═══════════════════════════════════════════════════ */
.two-col-layout {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 24px; flex: 1;
}
.col-card {
  background: var(--white);
  border-radius: 16px;
  padding: 28px 28px 24px;
  border: 1px solid rgba(46, 80, 144, 0.1);
  box-shadow: 0 4px 24px rgba(46, 80, 144, 0.08);
  display: flex; flex-direction: column; gap: 16px;
}
.card-icon-wrap {
  width: 44px; height: 44px; border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
}
.card-icon-wrap.blue { background: rgba(46, 80, 144, 0.12); color: var(--navy); }
.card-icon-wrap.teal { background: rgba(26, 111, 191, 0.12); color: var(--accent); }
.card-icon-wrap svg { width: 22px; height: 22px; }

.card-heading {
  font-family: var(--font-display);
  font-size: 17px; font-weight: 700;
  color: var(--deep);
}
.card-list {
  list-style: none; display: flex; flex-direction: column; gap: 10px;
}
.card-list li {
  font-family: var(--font-body);
  font-size: 14px; color: var(--slate);
  line-height: 1.5;
  padding-left: 18px; position: relative;
}
.card-list li::before {
  content: '';
  position: absolute; left: 0; top: 8px;
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--navy);
}

/* ═══════════════════════════════════════════════════
   SLIDE 3 — IMPORTANCE
═══════════════════════════════════════════════════ */
.importance-layout {
  flex: 1; display: flex; flex-direction: column; gap: 20px;
}
.importance-grid {
  display: grid; grid-template-columns: repeat(5, 1fr);
  gap: 14px;
}
.importance-card {
  background: var(--white);
  border-radius: 14px;
  padding: 20px 14px;
  border: 1px solid rgba(46, 80, 144, 0.1);
  box-shadow: 0 2px 12px rgba(46, 80, 144, 0.06);
  display: flex; flex-direction: column;
  align-items: center; gap: 12px;
  text-align: center;
  transition: transform 0.25s var(--ease-out-expo), box-shadow 0.25s;
  cursor: default;
}
.importance-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 28px rgba(46, 80, 144, 0.14);
}
.imp-icon {
  width: 44px; height: 44px; border-radius: 12px;
  background: linear-gradient(135deg, rgba(46,80,144,0.1), rgba(168,196,224,0.2));
  display: flex; align-items: center; justify-content: center;
  color: var(--navy);
}
.imp-icon svg { width: 22px; height: 22px; }
.importance-card span {
  font-family: var(--font-display);
  font-size: 12px; font-weight: 600;
  color: var(--deep); line-height: 1.4;
}

.example-callout {
  background: linear-gradient(135deg, var(--navy), var(--accent));
  border-radius: 14px;
  padding: 20px 28px;
  display: flex; align-items: center; gap: 20px;
  color: var(--white);
}
.callout-label {
  font-family: var(--font-display);
  font-size: 10px; font-weight: 700;
  letter-spacing: 0.15em; text-transform: uppercase;
  color: var(--mist);
  margin-bottom: 6px;
}
.example-callout p {
  font-family: var(--font-body);
  font-size: 14px; line-height: 1.6;
  color: rgba(255,255,255,0.9);
}
.example-callout strong { color: var(--white); }

/* ═══════════════════════════════════════════════════
   SLIDE 4 — TYPES
═══════════════════════════════════════════════════ */
.types-layout {
  flex: 1; display: flex; align-items: center;
  gap: 0;
}
.type-block {
  flex: 1; background: var(--white);
  border-radius: 16px;
  padding: 32px 28px;
  border: 1px solid rgba(46, 80, 144, 0.1);
  box-shadow: 0 4px 24px rgba(46, 80, 144, 0.08);
  position: relative; overflow: hidden;
}
.primary-block { border-top: 4px solid var(--navy); }
.secondary-block { border-top: 4px solid var(--mist); }

.type-number {
  font-family: var(--font-display);
  font-size: 64px; font-weight: 800;
  color: rgba(46, 80, 144, 0.07);
  position: absolute; top: 12px; right: 20px;
  line-height: 1;
  pointer-events: none;
}
.type-content { position: relative; z-index: 1; }
.type-content h3 {
  font-family: var(--font-display);
  font-size: 20px; font-weight: 800;
  color: var(--deep); margin-bottom: 8px;
}
.type-desc {
  font-family: var(--font-body);
  font-size: 13px; color: var(--slate);
  margin-bottom: 20px; line-height: 1.5;
}
.method-tags {
  display: flex; flex-wrap: wrap; gap: 8px;
}
.tag {
  display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--font-display);
  font-size: 12px; font-weight: 600;
  color: var(--navy);
  background: rgba(46, 80, 144, 0.08);
  border: 1px solid rgba(46, 80, 144, 0.15);
  padding: 6px 12px; border-radius: 20px;
  transition: all 0.2s;
}
.tag:hover { background: rgba(46, 80, 144, 0.15); }
.tag svg { width: 12px; height: 12px; }

.type-connector {
  display: flex; flex-direction: column;
  align-items: center; gap: 8px;
  padding: 0 20px;
}
.connector-line {
  width: 1px; height: 60px;
  background: linear-gradient(to bottom, transparent, var(--mist), transparent);
}
.connector-vs {
  font-family: var(--font-display);
  font-size: 11px; font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--light-slate);
  background: var(--frost);
  border: 1px solid rgba(168, 196, 224, 0.5);
  padding: 6px 10px; border-radius: 6px;
}

/* ═══════════════════════════════════════════════════
   SLIDE 5 — PROCESS
═══════════════════════════════════════════════════ */
.process-layout {
  flex: 1; display: flex; gap: 32px; align-items: flex-start;
}
.process-steps {
  flex: 1; display: flex; flex-direction: column; gap: 0;
}
.process-step {
  display: flex; align-items: flex-start; gap: 16px;
  position: relative;
}
.step-bubble {
  width: 40px; height: 40px; border-radius: 50%;
  background: linear-gradient(135deg, var(--navy), var(--accent));
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  box-shadow: 0 4px 14px rgba(46, 80, 144, 0.3);
  position: relative; z-index: 1;
}
.step-num {
  font-family: var(--font-display);
  font-size: 14px; font-weight: 800;
  color: var(--white);
}
.step-connector {
  position: absolute; left: 19px; top: 40px;
  width: 2px; height: 28px;
  background: linear-gradient(to bottom, var(--navy), rgba(46,80,144,0.2));
}
.step-body {
  padding: 8px 0 28px;
}
.step-body h4 {
  font-family: var(--font-display);
  font-size: 15px; font-weight: 700;
  color: var(--deep); margin-bottom: 3px;
}
.step-body p {
  font-family: var(--font-body);
  font-size: 13px; color: var(--slate); line-height: 1.5;
}

.process-keypoint {
  width: 260px; flex-shrink: 0;
  background: linear-gradient(135deg, var(--navy), var(--deep));
  border-radius: 16px;
  padding: 28px 24px;
  display: flex; flex-direction: column; gap: 16px;
  align-self: center;
  box-shadow: 0 8px 32px rgba(46, 80, 144, 0.25);
}
.keypoint-icon {
  width: 48px; height: 48px; border-radius: 14px;
  background: rgba(168, 196, 224, 0.15);
  display: flex; align-items: center; justify-content: center;
  color: var(--mist);
}
.keypoint-icon svg { width: 24px; height: 24px; }
.keypoint-text strong {
  display: block;
  font-family: var(--font-display);
  font-size: 14px; font-weight: 700;
  color: var(--white); margin-bottom: 8px;
}
.keypoint-text p {
  font-family: var(--font-body);
  font-size: 13px; color: rgba(168, 196, 224, 0.85);
  line-height: 1.6;
}

/* ═══════════════════════════════════════════════════
   SLIDE 6 — METHODS
═══════════════════════════════════════════════════ */
.methods-grid {
  display: grid; grid-template-columns: repeat(5, 1fr);
  gap: 14px; flex: 1;
}
.method-card {
  background: var(--white);
  border-radius: 14px;
  padding: 20px 16px;
  border: 1px solid rgba(46, 80, 144, 0.1);
  box-shadow: 0 2px 12px rgba(46, 80, 144, 0.06);
  display: flex; flex-direction: column;
  align-items: center; gap: 12px; text-align: center;
  transition: transform 0.25s var(--ease-out-expo), box-shadow 0.25s;
  cursor: default;
}
.method-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 30px rgba(46, 80, 144, 0.14);
}
.method-visual {
  width: 70px; height: 60px;
  display: flex; align-items: flex-end; justify-content: center;
}
.method-card h4 {
  font-family: var(--font-display);
  font-size: 13px; font-weight: 700; color: var(--deep);
}
.method-card p {
  font-family: var(--font-body);
  font-size: 11.5px; color: var(--slate); line-height: 1.4;
}

/* Mini Table */
.mini-table { width: 100%; display: flex; flex-direction: column; gap: 3px; }
.mt-row { display: flex; gap: 3px; }
.mt-row span { flex: 1; height: 10px; border-radius: 2px; background: rgba(46,80,144,0.15); }
.mt-row.header span { background: var(--navy); height: 8px; }

/* Mini Bar */
.bar-visual { gap: 4px; align-items: flex-end; }
.mini-bar {
  width: 14px; height: var(--h);
  background: linear-gradient(to top, var(--navy), var(--mist));
  border-radius: 3px 3px 0 0;
  animation: barGrow 0.8s var(--ease-out-expo) both;
}
@keyframes barGrow { from { transform: scaleY(0); transform-origin: bottom; } }

/* Pie */
.pie-visual svg { width: 60px; height: 60px; transform: rotate(-90deg); }

/* Line */
.line-visual svg { width: 80px; height: 50px; }

/* Info */
.info-visual svg { width: 60px; height: 50px; }

.methods-note {
  margin-top: 14px;
  font-family: var(--font-body);
  font-size: 13px; color: var(--slate);
  text-align: center;
  padding: 12px 20px;
  background: rgba(46, 80, 144, 0.06);
  border-radius: 8px;
  border-left: 3px solid var(--navy);
}
.methods-note strong { color: var(--navy); }

/* ═══════════════════════════════════════════════════
   SLIDE 7 — PRINCIPLES
═══════════════════════════════════════════════════ */
.principles-layout {
  flex: 1; display: grid; grid-template-columns: 1fr 320px;
  gap: 28px; align-items: start;
}
.principles-list { display: flex; flex-direction: column; gap: 16px; }
.principle-item {
  display: flex; flex-direction: column; gap: 8px;
}
.principle-bar {
  height: 6px; border-radius: 3px;
  background: rgba(46, 80, 144, 0.12);
  position: relative; overflow: hidden;
}
.principle-bar::after {
  content: '';
  position: absolute; inset-block: 0; left: 0;
  width: var(--w);
  background: linear-gradient(90deg, var(--navy), var(--mist));
  border-radius: 3px;
  transform: scaleX(0); transform-origin: left;
  transition: transform 0.8s var(--ease-out-expo);
  transition-delay: var(--delay, 0s);
}
.slide.active .principle-bar::after { transform: scaleX(1); }

.principle-label {
  display: flex; align-items: baseline; gap: 12px;
}
.p-name {
  font-family: var(--font-display);
  font-size: 15px; font-weight: 700; color: var(--deep);
  min-width: 110px;
}
.p-desc {
  font-family: var(--font-body);
  font-size: 13px; color: var(--slate);
}

.tips-panel {
  background: var(--white);
  border-radius: 16px;
  padding: 24px;
  border: 1px solid rgba(46, 80, 144, 0.1);
  box-shadow: 0 4px 20px rgba(46, 80, 144, 0.08);
}
.tips-heading {
  font-family: var(--font-display);
  font-size: 16px; font-weight: 800;
  color: var(--deep); margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 2px solid rgba(46, 80, 144, 0.1);
}
.tips-list { list-style: none; display: flex; flex-direction: column; gap: 12px; }
.tips-list li {
  display: flex; align-items: center; gap: 10px;
  font-family: var(--font-body);
  font-size: 13px; color: var(--slate); line-height: 1.4;
}
.tips-list li svg {
  width: 16px; height: 16px; flex-shrink: 0;
  color: var(--green-soft);
}

/* ═══════════════════════════════════════════════════
   SLIDE 8 — CHALLENGES
═══════════════════════════════════════════════════ */
.challenges-layout {
  flex: 1; display: flex; align-items: center; gap: 16px;
}
.challenges-col, .solutions-col {
  flex: 1; display: flex; flex-direction: column; gap: 12px;
}
.col-heading {
  font-family: var(--font-display);
  font-size: 14px; font-weight: 700;
  letter-spacing: 0.05em;
  display: flex; align-items: center; gap: 8px;
  padding-bottom: 10px;
  border-bottom: 2px solid rgba(46, 80, 144, 0.15);
  margin-bottom: 4px;
}
.col-heading svg { width: 18px; height: 18px; }
.challenge-heading { color: var(--red-soft); }
.solution-heading { color: var(--green-soft); }

.challenge-item {
  display: flex; align-items: center; gap: 12px;
  background: var(--white);
  border-radius: 10px;
  padding: 12px 16px;
  border: 1px solid rgba(224, 85, 85, 0.12);
  font-family: var(--font-body);
  font-size: 13px; color: var(--slate);
}
.ch-dot {
  width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0;
}
.ch-dot.red { background: var(--red-soft); }

.challenges-arrow {
  display: flex; align-items: center; justify-content: center;
  color: var(--mist); flex-shrink: 0;
}
.challenges-arrow svg { width: 30px; height: 60px; }

.solution-card {
  display: flex; align-items: flex-start; gap: 14px;
  background: var(--white);
  border-radius: 12px;
  padding: 14px 16px;
  border: 1px solid rgba(46, 158, 107, 0.15);
  box-shadow: 0 2px 10px rgba(46, 158, 107, 0.06);
}
.sol-icon {
  width: 36px; height: 36px; border-radius: 10px;
  background: rgba(46, 158, 107, 0.1);
  display: flex; align-items: center; justify-content: center;
  color: var(--green-soft); flex-shrink: 0;
}
.sol-icon svg { width: 18px; height: 18px; }
.solution-card strong {
  display: block;
  font-family: var(--font-display);
  font-size: 13px; font-weight: 700;
  color: var(--deep); margin-bottom: 3px;
}
.solution-card p {
  font-family: var(--font-body);
  font-size: 12px; color: var(--slate); line-height: 1.4;
}

/* ═══════════════════════════════════════════════════
   SLIDE 9 — APPLICATIONS
═══════════════════════════════════════════════════ */
.applications-layout {
  flex: 1; display: flex; align-items: center; gap: 0;
}
.app-block {
  flex: 1;
  background: var(--white);
  border-radius: 16px;
  padding: 32px 28px;
  border: 1px solid rgba(46, 80, 144, 0.1);
  box-shadow: 0 4px 24px rgba(46, 80, 144, 0.08);
  display: flex; flex-direction: column; gap: 16px;
}
.app-icon-wrap {
  width: 52px; height: 52px; border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
}
.app-icon-wrap.business { background: rgba(46, 80, 144, 0.1); color: var(--navy); }
.app-icon-wrap.technical { background: rgba(26, 111, 191, 0.1); color: var(--accent); }
.app-icon-wrap svg { width: 26px; height: 26px; }
.app-block h3 {
  font-family: var(--font-display);
  font-size: 18px; font-weight: 800; color: var(--deep);
}
.app-block ul { list-style: none; display: flex; flex-direction: column; gap: 10px; }
.app-block li {
  font-family: var(--font-body);
  font-size: 14px; color: var(--slate);
  padding-left: 18px; position: relative; line-height: 1.5;
}
.app-block li::before {
  content: '';
  position: absolute; left: 0; top: 8px;
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--navy);
}

.app-divider {
  width: 1px; height: 160px; flex-shrink: 0;
  background: linear-gradient(to bottom, transparent, var(--mist), transparent);
  margin: 0 28px;
}

.benefit-banner {
  margin-top: 20px;
  background: linear-gradient(135deg, var(--navy), var(--accent));
  border-radius: 14px;
  padding: 18px 24px;
  display: flex; align-items: center; gap: 16px;
  color: var(--white);
  flex-shrink: 0;
}
.benefit-icon {
  width: 40px; height: 40px; border-radius: 10px;
  background: rgba(255,255,255,0.15);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.benefit-icon svg { width: 20px; height: 20px; }
.benefit-text {
  font-family: var(--font-body);
  font-size: 14px; line-height: 1.6;
  color: rgba(255,255,255,0.9);
}
.benefit-text strong { color: var(--white); font-family: var(--font-display); }
.benefit-text em { font-style: italic; color: var(--mist); }

/* ═══════════════════════════════════════════════════
   SLIDE 10 — CONCLUSION
═══════════════════════════════════════════════════ */
.slide-conclusion {
  background: linear-gradient(145deg, var(--deep) 0%, #0D2240 60%, #122B50 100%);
  align-items: center; justify-content: center;
}
.conclusion-orb {
  position: absolute; border-radius: 50%;
  filter: blur(100px); pointer-events: none;
}
.orb-c1 {
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(46,80,144,0.3) 0%, transparent 70%);
  top: -200px; left: -100px;
}
.orb-c2 {
  width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(168,196,224,0.12) 0%, transparent 70%);
  bottom: -100px; right: 0;
}

.conclusion-content {
  max-width: 800px; width: 100%;
  display: flex; flex-direction: column;
  align-items: center; gap: 24px;
  text-align: center;
  position: relative; z-index: 2;
}
.conclusion-tag {
  font-family: var(--font-display);
  font-size: 11px; font-weight: 700;
  letter-spacing: 0.2em; text-transform: uppercase;
  color: var(--mist);
  background: rgba(168, 196, 224, 0.1);
  border: 1px solid rgba(168, 196, 224, 0.2);
  padding: 6px 16px; border-radius: 20px;
}
.conclusion-heading {
  font-family: var(--font-display);
  font-size: clamp(32px, 4vw, 52px);
  font-weight: 800; color: var(--white);
  letter-spacing: -0.02em; line-height: 1.1;
}
.conclusion-divider {
  width: 60px; height: 3px;
  background: linear-gradient(90deg, var(--navy), var(--mist));
  border-radius: 2px;
}

.conclusion-points {
  display: flex; flex-direction: column; gap: 14px;
  width: 100%;
}
.conclusion-point {
  display: flex; align-items: center; gap: 20px;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(168, 196, 224, 0.12);
  border-radius: 12px;
  padding: 16px 24px;
  text-align: left;
}
.cp-num {
  font-family: var(--font-display);
  font-size: 13px; font-weight: 800;
  color: var(--mist);
  background: rgba(46, 80, 144, 0.3);
  padding: 6px 10px; border-radius: 8px;
  flex-shrink: 0;
}
.conclusion-point p {
  font-family: var(--font-body);
  font-size: 14px; color: rgba(255,255,255,0.8);
  line-height: 1.5;
}
.conclusion-point strong { color: var(--white); }

.final-quote {
  font-family: var(--font-body);
  font-size: clamp(15px, 1.8vw, 18px);
  font-style: italic;
  color: rgba(168, 196, 224, 0.85);
  line-height: 1.7;
  padding: 20px 32px;
  border-left: 3px solid var(--navy);
  background: rgba(46, 80, 144, 0.1);
  border-radius: 0 12px 12px 0;
  text-align: left;
  width: 100%;
  position: relative;
}
.quote-mark {
  font-family: var(--font-display);
  font-size: 48px; font-weight: 800;
  color: var(--navy);
  line-height: 0; vertical-align: -0.4em;
  margin-right: 4px;
}
.quote-mark.closing {
  margin-left: 4px; margin-right: 0;
}

.conclusion-footer {
  display: flex; flex-direction: column;
  align-items: center; gap: 8px;
}
.footer-badge {
  font-family: var(--font-display);
  font-size: 14px; font-weight: 700;
  color: var(--white);
  background: linear-gradient(135deg, var(--navy), var(--accent));
  padding: 10px 28px; border-radius: 30px;
  letter-spacing: 0.05em;
}
.conclusion-footer p {
  font-family: var(--font-display);
  font-size: 11px; color: var(--light-slate);
  letter-spacing: 0.1em;
}

/* ═══════════════════════════════════════════════════
   RESPONSIVE
═══════════════════════════════════════════════════ */
@media (max-width: 900px) {
  .slide { padding: 44px 36px 72px; }
  .two-col-layout { grid-template-columns: 1fr; }
  .importance-grid { grid-template-columns: repeat(3, 1fr); }
  .methods-grid { grid-template-columns: repeat(3, 1fr); }
  .types-layout { flex-direction: column; }
  .type-connector { flex-direction: row; }
  .connector-line { width: 60px; height: 1px; }
  .principles-layout { grid-template-columns: 1fr; }
  .applications-layout { flex-direction: column; }
  .app-divider { width: 100%; height: 1px; margin: 0; }
  .title-visual { display: none; }
  .process-layout { flex-direction: column; }
  .process-keypoint { width: 100%; }
}

@media (max-width: 600px) {
  .slide { padding: 36px 20px 68px; }
  .importance-grid { grid-template-columns: repeat(2, 1fr); }
  .methods-grid { grid-template-columns: repeat(2, 1fr); }
  .challenges-layout { flex-direction: column; }
  .challenges-arrow { transform: rotate(90deg); }
  .nav-btn { width: 36px; height: 36px; }
  .nav-prev { left: 8px; }
  .nav-next { right: 8px; }
}