:root {
  --cds-background: #161616;
  --cds-layer: #262626;
  --cds-layer-alt: #202020;
  --cds-layer-accent: #393939;
  --cds-layer-accent-hover: #525252;
  --cds-border-subtle: #525252;
  --cds-border-strong: #8d8d8d;

  /* Orange accent */
  --cds-interactive: #ff832b;
  --cds-interactive-hover: #e26b16;

  --cds-text-primary: #f4f4f4;
  --cds-text-secondary: #c6c6c6;
  --cds-text-helper: #a8a8a8;

  --cds-link-primary: #ffb784;
  --cds-link-hover: #ffd2b0;

  --cds-tag-bg: #262626;
  --cds-tag-border: #525252;

  --cds-radius-sm: 0;
  --cds-radius-md: 0;
  --cds-radius-lg: 0;

  --cds-spacing-01: 0.125rem;
  --cds-spacing-02: 0.25rem;
  --cds-spacing-03: 0.5rem;
  --cds-spacing-04: 0.75rem;
  --cds-spacing-05: 1rem;
  --cds-spacing-06: 1.5rem;
  --cds-spacing-07: 2rem;
  --cds-spacing-08: 3rem;
  --cds-spacing-09: 4rem;

  --cds-font-family-sans: "IBM Plex Sans", system-ui, -apple-system, BlinkMacSystemFont,
    "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  font-family: var(--cds-font-family-sans);
  background: var(--cds-background);
  color: var(--cds-text-primary);
  -webkit-font-smoothing: antialiased;
}

/* Smooth scroll for in-page links */
html {
  scroll-behavior: smooth;
  font-size: 18px;
}

@media (max-width: 672px) {
  html {
    font-size: 17px;
  }
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

a {
  color: var(--cds-link-primary);
  text-decoration: none;
}

a:hover {
  color: var(--cds-link-hover);
  text-decoration: underline;
}

/* Header */
.cds-header {
  background: #000000;
  color: var(--cds-text-primary);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--cds-spacing-07);
  height: 3.25rem;
  border-bottom: 1px solid #262626;
  position: sticky;
  top: 0;
  z-index: 20;
}

.cds-header__brand {
  display: flex;
  align-items: center;
  gap: var(--cds-spacing-04);
}

.cds-header__brand-link {
  display: inline-flex;
  align-items: center;
  gap: var(--cds-spacing-04);
  color: inherit;
  text-decoration: none;
}

.cds-header__brand-link:hover {
  text-decoration: none;
}

.cds-header__logo {
  width: 1.4rem;
  height: 1.4rem;
  border: 1px solid var(--cds-text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 600;
}

.cds-header__title {
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

/* Single nav */
.cds-header__nav {
  display: flex;
  gap: var(--cds-spacing-06);
  font-size: 0.95rem;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.cds-header__nav a {
  color: var(--cds-text-secondary);
  text-decoration: none;
  position: relative;
  padding: 0.25rem 0;
}

.cds-header__nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  background: var(--cds-interactive);
  transition: width 0.16s ease-out;
}

.cds-header__nav a:hover::after,
.cds-header__nav a:focus-visible::after {
  width: 100%;
}

/* HIDE nav links when width < 800px */
@media (max-width: 800px) {
  .cds-header__nav {
    display: none;
  }
}

/* Layout */
.cds-shell {
  flex: 1;
}

.cds-main {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--cds-spacing-09) var(--cds-spacing-07) var(--cds-spacing-08);
}

.cds-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--cds-spacing-07);
}

@media (max-width: 960px) {
  .cds-header {
    padding: 0 var(--cds-spacing-05);
  }
  .cds-main {
    padding: var(--cds-spacing-08) var(--cds-spacing-05) var(--cds-spacing-07);
  }
  .cds-grid {
    grid-template-columns: repeat(6, 1fr);
    gap: var(--cds-spacing-06);
  }
}

@media (max-width: 672px) {
  .cds-main {
    padding: var(--cds-spacing-07) var(--cds-spacing-05) var(--cds-spacing-06);
  }
  .cds-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: var(--cds-spacing-05);
  }
}

/* Column spans */
.cds-col-span-4 {
  grid-column: span 4;
}

.cds-col-span-6 {
  grid-column: span 6;
}

.cds-col-span-8 {
  grid-column: span 8;
}

.cds-col-span-12 {
  grid-column: span 12;
}

@media (max-width: 960px) {
  .cds-col-span-4,
  .cds-col-span-6,
  .cds-col-span-8,
  .cds-col-span-12 {
    grid-column: span 6;
  }
}

@media (max-width: 672px) {
  .cds-col-span-4,
  .cds-col-span-6,
  .cds-col-span-8,
  .cds-col-span-12 {
    grid-column: span 4;
  }
}

/* Typography */
.cds-eyebrow {
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--cds-text-helper);
  margin-bottom: var(--cds-spacing-03);
}

.cds-heading-01 {
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.cds-heading-05 {
  font-size: 2.2rem;
  font-weight: 600;
  margin: 0 0 var(--cds-spacing-05);
}

.cds-body-02 {
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--cds-text-secondary);
}

@media (max-width: 672px) {
  .cds-heading-05 {
    font-size: 1.8rem;
  }
  .cds-body-02 {
    font-size: 1rem;
  }
}

/* Buttons */
.cds-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 1.4rem;
  border-radius: var(--cds-radius-sm);
  border: 1px solid transparent;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  background: transparent;
  color: var(--cds-text-primary);
  transition: background 0.12s ease-out, border-color 0.12s ease-out, color 0.12s ease-out;
  white-space: nowrap;
}

.cds-btn--primary {
  background: var(--cds-interactive);
  color: #ffffff;
}

.cds-btn--primary:hover {
  background: var(--cds-interactive-hover);
}

.cds-btn--secondary {
  border-color: var(--cds-border-strong);
  color: var(--cds-text-primary);
  background: rgba(38, 38, 38, 0.7);
}

.cds-btn--secondary:hover {
  background: var(--cds-layer-accent-hover);
}

.cds-btn__icon {
  margin-left: var(--cds-spacing-03);
  font-size: 0.9em;
}

/* Hero */
.hero {
  margin-bottom: var(--cds-spacing-09);
}

.hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
  gap: var(--cds-spacing-08);
  align-items: stretch;
}

/* Main content (left) */
.hero__content {
  display: flex;
  flex-direction: column;
  gap: var(--cds-spacing-05);
  justify-content: center;
}

.hero__kicker {
  max-width: 38rem;
  margin: 0;
}

/* CTA group */
.hero__cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--cds-spacing-04);
}

/* Profile card (right) */
.hero__panel {
  background: radial-gradient(circle at top left, #ff832b22, transparent 55%),
    var(--cds-layer);
  padding: var(--cds-spacing-07);
  border-radius: var(--cds-radius-md);
  border: 1px solid var(--cds-border-subtle);
  display: flex;
  flex-direction: column;
  gap: var(--cds-spacing-05);
}

.hero__panel-header {
  border-bottom: 1px solid var(--cds-border-subtle);
  padding-bottom: var(--cds-spacing-04);
  margin-bottom: var(--cds-spacing-04);
}

.hero__name {
  font-size: 1.6rem;
  font-weight: 500;
}

.hero__role {
  font-size: 1rem;
  color: var(--cds-text-helper);
  margin-top: var(--cds-spacing-02);
}

.hero__statement {
  font-size: 1rem;
  color: var(--cds-text-secondary);
  margin: 0;
}

.hero__panel-section {
  display: flex;
  flex-direction: column;
  gap: var(--cds-spacing-03);
}

.hero__panel-section-title {
  margin: 0;
}

.hero__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--cds-spacing-02);
}

.cds-tag {
  border-radius: 999px;
  border: 1px solid var(--cds-tag-border);
  padding: 0 var(--cds-spacing-03);
  height: 1.7rem;
  display: inline-flex;
  align-items: center;
  font-size: 0.8rem;
  color: var(--cds-text-helper);
  background: var(--cds-tag-bg);
  white-space: nowrap;
}

/* Responsive hero */
@media (max-width: 960px) {
  .hero__inner {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--cds-spacing-07);
  }

  .hero__panel {
    padding: var(--cds-spacing-06);
  }
}

@media (max-width: 672px) {
  .hero {
    margin-bottom: var(--cds-spacing-07);
  }

  .hero__panel {
    padding: var(--cds-spacing-05);
  }
}

/* Sections */
.section {
  margin-bottom: var(--cds-spacing-09);
}

.section__header {
  margin-bottom: var(--cds-spacing-06);
}

.section__title {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--cds-spacing-04);
}

.section__title-main {
  font-size: 1.35rem;
  font-weight: 500;
}

@media (max-width: 672px) {
  .section {
    margin-bottom: var(--cds-spacing-07);
  }
  .section__title {
    flex-direction: column;
    align-items: flex-start;
  }
  .section__title-main {
    font-size: 1.2rem;
  }
}

/* Cards */
.cds-card {
  background: var(--cds-layer);
  border-radius: var(--cds-radius-md);
  border: 1px solid var(--cds-border-subtle);
  padding: var(--cds-spacing-06);
  display: flex;
  flex-direction: column;
  gap: var(--cds-spacing-04);
}

.cds-card--clickable {
  cursor: pointer;
  transition: border-color 0.12s ease-out, box-shadow 0.12s ease-out, transform 0.08s ease-out,
    background 0.12s ease-out;
}

.cds-card--clickable:hover {
  border-color: var(--cds-interactive);
  box-shadow: 0 0 0 1px #ff832b66;
  transform: translateY(-1px);
  background: var(--cds-layer-accent);
}

.cds-card__eyebrow {
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--cds-text-helper);
}

.cds-card__title {
  font-size: 1.1rem;
  font-weight: 500;
  margin: 0;
}

.cds-card__subtitle {
  font-size: 0.9rem;
  color: var(--cds-text-helper);
  margin-bottom: var(--cds-spacing-02);
}

.cds-card__body {
  font-size: 0.95rem;
  color: var(--cds-text-secondary);
}

.cds-card__meta {
  margin-top: auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--cds-spacing-04);
  font-size: 0.85rem;
  color: var(--cds-text-helper);
}

.cds-card__pill-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--cds-spacing-02);
}

.cds-pill {
  border-radius: 999px;
  background: #ff832b1a;
  color: var(--cds-link-primary);
  padding: 0 0.6rem;
  font-size: 0.8rem;
  height: 1.5rem;
  display: inline-flex;
  align-items: center;
}

/* Skills: 2-column grid with IBM-style SVG icons */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--cds-spacing-07);
}

@media (max-width: 960px) {
  .skills-grid {
    gap: var(--cds-spacing-06);
  }
}

@media (max-width: 672px) {
  .skills-grid {
    grid-template-columns: minmax(0, 1fr);
  }
}

.skills-group__title {
  font-size: 0.98rem;
  font-weight: 500;
  margin-bottom: var(--cds-spacing-03);
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--cds-text-primary);
  display: inline-flex;
  align-items: center;
  gap: var(--cds-spacing-03);
}

/* IBM-style glyph: small, monochrome line icon */
.skills-group__icon {
  width: 1.1rem;
  height: 1.1rem;
  fill: none;
  stroke: var(--cds-text-helper);
  stroke-width: 1.6;
}

.skills-group__label {
  display: inline-block;
}

.skills-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: var(--cds-spacing-02);
  font-size: 0.95rem;
}

.skills-list li {
  color: var(--cds-text-secondary);
  position: relative;
  padding-left: 1rem;
}

.skills-list li::before {
  content: "•";
  position: absolute;
  left: 0;
  color: var(--cds-text-helper);
}

/* Experience */
.timeline {
  border-left: 1px solid var(--cds-border-subtle);
  margin-left: var(--cds-spacing-04);
  padding-left: var(--cds-spacing-06);
  display: grid;
  gap: var(--cds-spacing-06);
}

.timeline__item {
  position: relative;
}

.timeline__item::before {
  content: "";
  position: absolute;
  left: -1.36rem;
  top: 0.2rem;
  width: 0.6rem;
  height: 0.6rem;
  border-radius: 50%;
  background: var(--cds-background);
  border: 2px solid var(--cds-interactive);
}

.timeline__role {
  font-size: 1.05rem;
  font-weight: 500;
  margin-bottom: var(--cds-spacing-02);
}

.timeline__org-year {
  display: flex;
  justify-content: space-between;
  gap: var(--cds-spacing-04);
  font-size: 0.9rem;
  color: var(--cds-text-helper);
  margin-bottom: var(--cds-spacing-03);
}

.timeline__body {
  font-size: 0.95rem;
  color: var(--cds-text-secondary);
}

@media (max-width: 672px) {
  .timeline {
    margin-left: var(--cds-spacing-02);
    padding-left: var(--cds-spacing-04);
  }
  .timeline__org-year {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* Certifications */
.cert-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--cds-spacing-06);
}

@media (max-width: 960px) {
  .cert-grid {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* Projects */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--cds-spacing-06);
}

@media (max-width: 1040px) {
  .projects-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .projects-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--cds-spacing-05);
  }
}

/* Contact */
.contact-panel {
  background: var(--cds-layer-alt);
  border-radius: var(--cds-radius-md);
  border: 1px solid var(--cds-border-subtle);
  padding: var(--cds-spacing-07);
  display: grid;
  grid-template-columns: minmax(0, 2.5fr) minmax(0, 1.5fr);
  gap: var(--cds-spacing-06);
  align-items: start;
}

@media (max-width: 960px) {
  .contact-panel {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (max-width: 672px) {
  .contact-panel {
    padding: var(--cds-spacing-05);
    gap: var(--cds-spacing-05);
  }
}

.contact-meta {
  font-size: 0.95rem;
  color: var(--cds-text-secondary);
  margin-bottom: var(--cds-spacing-04);
}

.contact-email {
  font-size: 1rem;
  margin-bottom: var(--cds-spacing-03);
}

.contact-email a {
  font-weight: 500;
}

.contact-note {
  font-size: 0.85rem;
  color: var(--cds-text-helper);
}

.contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--cds-spacing-03);
  font-size: 0.9rem;
}

.contact-links a {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  color: var(--cds-link-primary);
}

/* Footer */
.cds-footer {
  border-top: 1px solid #262626;
  padding: var(--cds-spacing-05) var(--cds-spacing-07);
  font-size: 0.9rem;
  color: var(--cds-text-helper);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--cds-spacing-03);
  background: #000000;
}

.cds-footer__brand {
  display: flex;
  align-items: center;
  gap: var(--cds-spacing-03);
}

.cds-footer__links {
  display: flex;
  gap: var(--cds-spacing-04);
}

@media (max-width: 672px) {
  .cds-footer {
    padding: var(--cds-spacing-04) var(--cds-spacing-05);
    flex-direction: column;
    align-items: flex-start;
  }
}

/* Back to top (IBM-style square, visibility controlled by JS; positioned above footer) */
.back-to-top {
  position: fixed;
  right: var(--cds-spacing-05);
  /* raised above footer area */
  bottom: calc(var(--cds-spacing-05) + 3rem);
  width: 2.5rem;
  height: 2.5rem;
  background: #000000;
  color: var(--cds-text-primary);
  border: 1px solid var(--cds-border-subtle);
  border-radius: 0;
  font-size: 1.2rem;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  z-index: 30;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);

  /* Hidden by default; becomes visible via .back-to-top--visible */
  opacity: 0;
  pointer-events: none;
  transform: translateY(4px);
  transition: opacity 0.15s ease-out, transform 0.15s ease-out;
}

.back-to-top:hover {
  background: var(--cds-layer-accent);
}

.back-to-top--visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

@media (max-width: 672px) {
  .back-to-top {
    right: var(--cds-spacing-04);
    bottom: calc(var(--cds-spacing-04) + 2.5rem);
    width: 2.25rem;
    height: 2.25rem;
    font-size: 1.1rem;
  }
}

/* Reveal animation */
.reveal {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.2s ease-out, transform 0.2s ease-out;
}

.reveal--visible {
  opacity: 1;
  transform: translateY(0);
}