:root {
  --bg-primary: #ffffff;
  --bg-secondary: #fafafa;
  --bg-tertiary: #f5f5f5;
  --bg-card: #ffffff;
  --bg-hover: #f0f0f0;

  --text-primary: #1a1a1a;
  --text-secondary: #525252;
  --text-tertiary: #737373;
  --text-muted: #a3a3a3;

  --accent: #22c55e;
  --accent-dim: #16a34a;
  --accent-light: #dcfce7;

  --border: #e5e5e5;
  --border-hover: #d4d4d4;
  --border-accent: rgba(34, 197, 94, 0.3);

  --font-sans:
    "Google Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "Google Sans Code", "SF Mono", monospace;
  --font-display: "Google Sans Code", monospace;

  --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-snap: cubic-bezier(0.16, 1, 0.3, 1);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html,
body {
  height: 100%;
  overflow: hidden;
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.frame-top,
.frame-bottom {
  position: fixed;
  left: 0;
  right: 0;
  z-index: 100;
  background: var(--bg-primary);
}

.frame-top {
  top: 0;
  border-bottom: 1px solid var(--border);
}

.frame-bottom {
  bottom: 0;
  border-top: 1px solid var(--border);
}

.frame-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 32px;
  height: 56px;
}

.frame-label {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-tertiary);
}

.frame-label::before {
  content: "$ ";
  color: var(--accent);
}

.frame-date {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
}

.frame-left,
.frame-right {
  position: fixed;
  top: 56px;
  bottom: 56px;
  width: 1px;
  background: var(--border);
  z-index: 100;
}

.frame-left {
  left: 32px;
}

.frame-right {
  right: 32px;
}

.stage {
  position: fixed;
  inset: 56px 48px;
  z-index: 10;
}

.slide {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition:
    opacity 350ms var(--ease-smooth),
    visibility 350ms;
}

.slide.active {
  opacity: 1;
  visibility: visible;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.slide-content {
  width: 100%;
  max-width: 1000px;
  padding: 32px;
  margin: auto;
}

/* Hero */
.hero-layout {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 20px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  background: var(--accent-light);
  border: 1px solid var(--border-accent);
  border-radius: 6px;
}

.badge-dot {
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

.badge-text {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--accent-dim);
  font-weight: 600;
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.02em;
}

.hero-role {
  font-size: clamp(1.1rem, 2.5vw, 1.5rem);
  font-weight: 500;
  color: var(--text-primary);
  margin: 0;
}

.hero-tagline {
  font-size: clamp(1rem, 2vw, 1.25rem);
  font-weight: 400;
  color: var(--text-secondary);
  margin: 0;
}

.hero-divider {
  width: 40px;
  height: 2px;
  background: var(--border);
}

.hero-contact {
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
}

.contact-link {
  display: flex;
  flex-direction: column;
  gap: 2px;
  text-decoration: none;
  color: inherit;
  padding: 8px 0;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease;
}

.contact-link:hover {
  border-color: var(--accent);
}

.project-link {
  display: inline-flex;
  flex-direction: column;
  gap: 2px;
  text-decoration: none;
  color: inherit;
  padding: 6px 0;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease;
}

.project-link:hover {
  border-color: var(--accent);
}

.link-label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-muted);
  text-transform: uppercase;
}

.link-value {
  font-size: 0.9rem;
  font-weight: 500;
  font-family: var(--font-mono);
}

/* Skill */
.skill-layout {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.skill-index {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.index-num {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent);
}

.index-total {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.skill-body {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.skill-name {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.skill-sub {
  font-weight: 400;
  color: var(--text-secondary);
}

.skill-bar {
  width: 32px;
  height: 2px;
  background: var(--accent);
}

.skill-desc,
h3.skill-desc {
  font-size: clamp(1.05rem, 2vw, 1.35rem);
  font-weight: 400;
  line-height: 1.6;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0;
}

/* Project */
.project-layout {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.project-header {
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

.project-tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--accent);
  font-weight: 600;
}

.project-tag::before {
  content: "/* ";
}

.project-tag::after {
  content: " */";
}

.project-title {
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 600;
  margin-top: 6px;
  letter-spacing: -0.02em;
}

.project-subtitle {
  font-size: 0.95rem;
  color: var(--text-tertiary);
  margin-top: 4px;
}

.project-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}

.project-col {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.col-title {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  text-transform: uppercase;
}

.capability-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.capability {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  padding: 12px 14px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 6px;
  transition: all 0.2s ease;
}

.capability:hover {
  border-color: var(--border-hover);
  background: var(--bg-tertiary);
}

.cap-icon {
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  flex-shrink: 0;
}

.cap-text {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.challenge-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.challenge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 6px 10px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-tertiary);
}

.tech-stack {
  margin-top: auto;
  padding-top: 20px;
}

.stack-label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-muted);
  text-transform: uppercase;
  display: block;
  margin-bottom: 10px;
}

.stack-items {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.stack-item {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 4px 8px;
  background: var(--bg-tertiary);
  border-radius: 4px;
  color: var(--text-secondary);
}

/* Deliverables */
.deliverables-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-top: 36px;
}

.deliverable-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px;
  transition: all 0.2s ease;
}

.deliverable-card:hover {
  border-color: var(--border-hover);
  background: var(--bg-secondary);
}

.card-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 12px;
}

.card-num::before {
  content: "[";
  color: var(--text-muted);
}

.card-num::after {
  content: "]";
  color: var(--text-muted);
}

.card-title {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 6px;
}

.card-desc {
  font-size: 0.8rem;
  color: var(--text-tertiary);
  line-height: 1.5;
}

/* Org */
.org-layout {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.org-header {
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}

.org-tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--accent);
  font-weight: 600;
}

.org-tag::before {
  content: "// ";
}

.org-title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 600;
  margin-top: 4px;
}

.org-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.org-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 24px;
  transition: border-color 0.2s ease;
}

.org-card:hover {
  border-color: var(--border-hover);
}

.org-card-header {
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}

.org-name {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 2px;
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
}

.org-website {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 400;
  color: var(--accent);
  text-decoration: none;
  transition: opacity 0.2s ease;
}

.org-website:hover {
  opacity: 0.7;
  text-decoration: underline;
}

.org-role {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--accent);
  font-weight: 500;
}

.org-achievements {
  list-style: none;
  margin-bottom: 16px;
}

.org-achievements li {
  display: flex;
  gap: 8px;
  align-items: flex-start;
  padding: 8px 0;
  font-size: 0.85rem;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border);
}

.org-achievements li:last-child {
  border-bottom: none;
}

.ach-check {
  color: var(--accent);
  font-family: var(--font-mono);
  flex-shrink: 0;
}

.org-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.org-tech-item {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  padding: 3px 8px;
  background: var(--bg-tertiary);
  border-radius: 4px;
  color: var(--text-tertiary);
}

/* Closing */
.closing-layout {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 20px;
  max-width: 600px;
}

.closing-prompt {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.closing-prompt::before {
  content: "$ ";
  color: var(--accent);
}

.closing-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.closing-text {
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--text-secondary);
}

.closing-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.closing-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: 6px;
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 500;
  font-family: var(--font-mono);
  transition: all 0.15s ease;
}

.closing-btn.primary {
  background: var(--accent);
  color: white;
}

.closing-btn.primary:hover {
  background: var(--accent-dim);
}

.closing-btn.secondary {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  color: var(--text-primary);
}

.closing-btn.secondary:hover {
  border-color: var(--border-hover);
  background: var(--bg-tertiary);
}

.closing-footer {
  margin-top: 28px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  width: 100%;
}

.footer-meta {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
}

/* Nav */
.nav-info {
  display: flex;
  align-items: center;
  gap: 4px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.nav-page {
  color: var(--text-primary);
  font-weight: 600;
}

.nav-separator,
.nav-total {
  color: var(--text-muted);
}

.nav-controls {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-btn {
  width: 32px;
  height: 32px;
  border-radius: 6px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s ease;
}

.nav-btn:hover:not(:disabled) {
  background: var(--bg-tertiary);
  border-color: var(--border-hover);
  color: var(--text-primary);
}

.nav-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

.nav-progress {
  width: 100px;
  height: 2px;
  background: var(--border);
  border-radius: 1px;
  overflow: hidden;
}

.nav-progress-bar {
  height: 100%;
  background: var(--accent);
  transition: width 0.3s var(--ease-snap);
}

.nav-hint {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
}

/* Responsive */
@media (max-width: 1024px) {
  .frame-content {
    padding: 12px 20px;
  }
  .stage {
    inset: 44px 28px;
  }
  .frame-left,
  .frame-right {
    display: none;
  }
  .project-grid,
  .org-grid {
    grid-template-columns: 1fr;
  }
  .deliverables-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .slide {
    align-items: flex-start;
  }
  .slide-content {
    padding: 20px;
  }
  .deliverables-grid {
    grid-template-columns: 1fr;
  }
  .nav-hint {
    display: none;
  }
  .hero-contact {
    flex-direction: column;
    gap: 12px;
  }
  .closing-actions {
    flex-direction: column;
    width: 100%;
  }
  .closing-btn {
    justify-content: center;
  }
}

/* Animations */
@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.slide.active .hero-badge,
.slide.active .hero-title,
.slide.active .hero-tagline,
.slide.active .hero-divider,
.slide.active .hero-contact {
  animation: fadeUp 0.5s var(--ease-snap) both;
}

.slide.active .hero-badge {
  animation-delay: 0.05s;
}

.slide.active .hero-title {
  animation-delay: 0.1s;
}

.slide.active .hero-tagline {
  animation-delay: 0.2s;
}

.slide.active .hero-divider {
  animation-delay: 0.3s;
}

.slide.active .hero-contact {
  animation-delay: 0.4s;
}

.slide.active .skill-index,
.slide.active .skill-body {
  animation: fadeUp 0.5s var(--ease-snap) both;
}

.slide.active .skill-index {
  animation-delay: 0.05s;
}

.slide.active .skill-body {
  animation-delay: 0.15s;
}

.slide.active .deliverable-card {
  animation: fadeUp 0.4s var(--ease-snap) both;
}

.slide.active .deliverable-card:nth-child(1) {
  animation-delay: 0.25s;
}

.slide.active .deliverable-card:nth-child(2) {
  animation-delay: 0.35s;
}

.slide.active .deliverable-card:nth-child(3) {
  animation-delay: 0.45s;
}

.slide.active .deliverable-card:nth-child(4) {
  animation-delay: 0.55s;
}

.slide.active .org-card {
  animation: fadeUp 0.5s var(--ease-snap) both;
}

.slide.active .org-card:nth-child(1) {
  animation-delay: 0.15s;
}

.slide.active .org-card:nth-child(2) {
  animation-delay: 0.3s;
}

.slide.active .closing-prompt,
.slide.active .closing-title,
.slide.active .closing-text,
.slide.active .closing-actions,
.slide.active .closing-footer {
  animation: fadeUp 0.5s var(--ease-snap) both;
}

.slide.active .closing-prompt {
  animation-delay: 0.05s;
}

.slide.active .closing-title {
  animation-delay: 0.15s;
}

.slide.active .closing-text {
  animation-delay: 0.25s;
}

.slide.active .closing-actions {
  animation-delay: 0.35s;
}

.slide.active .closing-footer {
  animation-delay: 0.45s;
}