:root {
  --background: hsl(28, 9%, 9%); /* Deep Warm Charcoal */
  --surface-lowest: hsl(28, 9%, 7%);
  --surface-low: hsl(28, 6%, 11%);
  --surface: hsl(28, 6%, 13%);
  --surface-high: hsl(28, 6%, 16%);
  --surface-highest: hsl(28, 6%, 20%);
  --text: hsl(35, 15%, 90%); /* Warm Cream White */
  --muted: hsl(35, 8%, 74%);
  --dim: hsl(35, 6%, 56%);
  --outline: hsla(35, 15%, 90%, 0.08);
  --accent: hsl(20, 68%, 52%); /* Terracotta */
  --accent-strong: hsl(20, 80%, 62%);
  --accent-ink: hsl(20, 95%, 8%);
  --danger: #ff6b6b;
  --warning: #facc15;
  --container: 1100px;
  --gutter: clamp(24px, 5vw, 32px);

  --font-serif: 'Lora', Georgia, serif;
  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  --transition-custom: all 0.5s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-fast: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);

  font-family: var(--font-sans);
}

body.light-theme {
  --background: hsl(35, 20%, 96%); /* Premium Warm Cream */
  --surface-lowest: hsl(35, 15%, 98%);
  --surface-low: hsl(35, 12%, 93%);
  --surface: hsl(35, 10%, 90%);
  --surface-high: hsl(35, 8%, 86%);
  --surface-highest: hsl(35, 8%, 82%);
  --text: hsl(28, 12%, 12%); /* Charcoal Chữ */
  --muted: hsl(28, 8%, 36%);
  --dim: hsl(28, 6%, 52%);
  --outline: hsla(28, 12%, 12%, 0.08);
  --accent: hsl(20, 72%, 48%); /* Terracotta */
  --accent-strong: hsl(20, 80%, 42%);
  --accent-ink: hsl(35, 20%, 96%);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  background-color: var(--background);
  transition: background-color 0.4s cubic-bezier(0.16, 1, 0.3, 1),
              color 0.4s cubic-bezier(0.16, 1, 0.3, 1),
              border-color 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  overflow-x: hidden;
}

/* Paper Grain Texture Overlay */
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  opacity: 0.035;
  pointer-events: none;
  z-index: 9999;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
}

/* Editorial Column Grid Lines */
.grid-lines {
  position: fixed;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  max-width: var(--container);
  height: 100vh;
  display: flex;
  justify-content: space-between;
  pointer-events: none;
  z-index: -1;
  padding: 0 var(--gutter);
}

.grid-line {
  width: 1px;
  height: 100%;
  background-color: var(--outline);
  opacity: 0.3;
}

a {
  color: inherit;
  text-decoration: none;
}

.material-symbols-outlined {
  font-size: 20px;
  line-height: 1;
  vertical-align: middle;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: var(--surface-lowest);
}
::-webkit-scrollbar-thumb {
  background: var(--surface-highest);
  border-radius: 4px;
  transition: var(--transition-fast);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--accent);
}

/* Accessibility Focus Indicator */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

/* Code Card Syntax Highlighting Tokens */
.token-keyword {
  color: var(--accent);
  font-weight: 600;
}

.token-class {
  color: var(--text);
  font-weight: 600;
}

.token-property {
  color: hsl(35, 12%, 80%);
}

body.light-theme .token-property {
  color: hsl(28, 8%, 32%);
}

.token-string {
  color: hsl(142, 35%, 55%);
}

body.light-theme .token-string {
  color: hsl(142, 45%, 35%);
}

.token-method {
  color: var(--accent-strong);
  font-weight: 500;
}

.topbar {
  position: sticky;
  z-index: 20;
  top: 0;
  display: flex;
  width: 100%;
  min-height: 72px;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  border-bottom: 1px solid var(--outline);
  padding: 0 max(var(--gutter), calc((100vw - var(--container)) / 2));
  background: var(--background);
  transition: var(--transition-custom);
}

.brand,
.nav-links {
  display: flex;
  align-items: center;
}

.brand {
  gap: 10px;
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  transition: var(--transition-fast);
}

.brand:hover {
  color: var(--accent);
}

.brand-mark {
  position: relative;
  display: inline-grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border: 1px solid var(--outline);
  border-radius: 4px;
  color: var(--accent);
  background: var(--surface-lowest);
  transition: var(--transition-fast);
}

.brand:hover .brand-mark {
  border-color: var(--accent);
  background: var(--accent-muted);
  color: var(--accent-strong);
}

.brand-mark .material-symbols-outlined {
  font-size: 20px;
  font-variation-settings: "FILL" 0, "wght" 400;
}

.nav-links {
  gap: 32px;
}

.nav-links a,
.resume-button {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: var(--transition-fast);
}

.nav-links a:hover {
  color: var(--text);
}

.header-actions-group {
  display: flex;
  align-items: center;
  gap: 10px;
}

.lang-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 36px;
  padding: 0 10px;
  border: 1px solid var(--outline);
  border-radius: 4px;
  color: var(--muted);
  background: transparent;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  transition: var(--transition-fast);
}

.lang-toggle:hover {
  color: var(--text);
  border-color: var(--accent);
  background: var(--surface-low);
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: 1px solid var(--outline);
  border-radius: 4px;
  color: var(--muted);
  background: transparent;
  cursor: pointer;
  transition: var(--transition-fast);
}

.theme-toggle:hover {
  color: var(--text);
  border-color: var(--accent);
  background: var(--surface-low);
}

.theme-toggle .material-symbols-outlined {
  font-size: 18px;
}

.resume-button {
  border: 1px solid var(--outline);
  border-radius: 4px;
  padding: 8px 18px;
}

.resume-button:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-muted);
}

.menu-button {
  display: none;
  border: 1px solid var(--outline);
  border-radius: 4px;
  width: 36px;
  height: 36px;
  align-items: center;
  justify-content: center;
  color: var(--muted);
  background: transparent;
  cursor: pointer;
}

.hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 380px);
  gap: clamp(24px, 5vw, 64px);
  align-items: center;
  min-height: calc(100vh - 64px);
  width: min(var(--container), calc(100% - 40px));
  margin: 0 auto;
  padding: 96px 0 120px;
}

.hero-copy {
  max-width: 820px;
}

.eyebrow,
.section-label {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 24px;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.eyebrow span:first-child {
  width: 24px;
  height: 1px;
  background: var(--accent);
}

.hero h1,
.section-header h2,
.contact-inner h2,
.about-grid h2 {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 500;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

#heroName {
  white-space: nowrap;
}

.hero h1 {
  font-size: clamp(2.4rem, 5.5vw, 4.4rem);
}

.hero h1 em {
  color: var(--dim);
  font-style: italic;
  font-weight: 400;
  white-space: nowrap;
}

.hero-lead {
  max-width: 700px;
  margin: 28px 0 0;
  color: var(--muted);
  font-size: clamp(1.05rem, 1.4vw, 1.15rem);
  line-height: 1.7;
}

.hero-actions,
.contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 42px;
}

.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: 4px;
  padding: 0 22px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: var(--transition-fast);
  cursor: pointer;
}

.button:hover {
  transform: translateY(-2px);
}

.button.primary {
  color: var(--accent-ink);
  background: var(--accent);
  border: 1px solid var(--accent);
}

.button.primary:hover {
  background: var(--accent-strong);
  border-color: var(--accent-strong);
}

.button.secondary {
  border: 1px solid var(--outline);
  color: var(--text);
  background: transparent;
}

.button.secondary:hover {
  border-color: var(--accent);
  background: var(--accent-muted);
  color: var(--accent);
}

.specs-card,
.skill-feature,
.code-card,
.timeline-item {
  border: 1px solid var(--outline);
  border-radius: 6px;
  background: var(--surface-low);
  box-shadow:
    0 2px 8px -2px rgba(0, 0, 0, 0.08),
    0 12px 32px -4px rgba(0, 0, 0, 0.12);
  transition: var(--transition-custom);
}

body.light-theme .specs-card,
body.light-theme .skill-feature,
body.light-theme .code-card,
body.light-theme .timeline-item {
  box-shadow:
    0 2px 8px -2px rgba(28, 12, 12, 0.04),
    0 12px 32px -4px rgba(28, 12, 12, 0.06);
}

.specs-card {
  overflow: hidden;
}

.specs-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 22px;
  background: var(--surface);
  border-bottom: 1px solid var(--outline);
}

.specs-title {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text);
}

.specs-meta {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--dim);
}

.specs-body {
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.spec-row {
  display: flex;
  flex-direction: column;
  gap: 4px;
  border-bottom: 1px solid var(--outline);
  padding-bottom: 12px;
}

.spec-row:last-of-type {
  border-bottom: 0;
  padding-bottom: 0;
}

.spec-label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--dim);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.spec-value {
  font-family: var(--font-sans);
  font-size: 0.96rem;
  font-weight: 500;
  color: var(--text);
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 8px;
}

.stat-grid div {
  border-top: 0;
  border-left: 1px solid var(--outline);
  padding-left: 12px;
  padding-top: 0;
}

.stat-grid div:first-child {
  border-left: 0;
  padding-left: 0;
}

.stat-grid strong {
  display: block;
  color: var(--accent);
  font-family: var(--font-serif);
  font-size: 1.45rem;
  font-weight: 600;
}

.stat-grid span {
  display: block;
  color: var(--dim);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  margin-top: 4px;
}
.section {
  scroll-margin-top: 72px;
  width: min(var(--container), calc(100% - 40px));
  margin: 0 auto;
  padding: 112px 0;
  border-top: 1px solid var(--outline);
  transition: border-color 0.4s ease;
}

.about-grid {
  display: grid;
  grid-template-columns: minmax(260px, 1fr) minmax(300px, 0.8fr);
  gap: clamp(32px, 6vw, 88px);
  align-items: center;
}

.about-grid h2,
.section-header h2,
.contact-inner h2 {
  font-size: clamp(1.8rem, 4.2vw, 3.4rem);
}

.about-grid p:not(.section-label),
.section-header p {
  margin: 0;
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.7;
}

.about-copy #summary {
  margin-top: 28px;
}

.about-copy #summary::first-letter {
  font-family: var(--font-serif);
  font-size: 3.6rem;
  font-weight: 500;
  float: left;
  line-height: 0.85;
  margin-right: 12px;
  margin-top: 4px;
  color: var(--accent);
  font-style: italic;
}

.about-photo {
  position: relative;
  overflow: hidden;
  margin: 0;
  border: 1px solid var(--outline);
  border-radius: 6px;
  background: var(--surface-lowest);
  box-shadow:
    0 4px 12px -2px rgba(0, 0, 0, 0.08),
    0 16px 48px -4px rgba(0, 0, 0, 0.16);
  transition: var(--transition-custom);
}

.about-photo::after {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 60%, rgba(28, 9, 9, 0.6) 100%);
  content: "";
  pointer-events: none;
  transition: var(--transition-custom);
}

body.light-theme .about-photo::after {
  background: linear-gradient(180deg, transparent 60%, rgba(253, 251, 247, 0.5) 100%);
}

.about-photo img {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  object-position: 38% 50%;
  filter: saturate(0.95) contrast(1.02) brightness(0.92);
  transition: var(--transition-custom);
}

.about-photo:hover img {
  filter: saturate(1.05) contrast(1.04) brightness(0.98);
}

.about-photo figcaption {
  position: absolute;
  z-index: 1;
  right: 18px;
  bottom: 16px;
  left: 18px;
  color: hsl(35, 15%, 95%);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

body.light-theme .about-photo figcaption {
  color: hsl(28, 12%, 12%);
}

.section-header {
  max-width: 720px;
  margin-bottom: 64px;
}

.section-header h2 span {
  color: var(--accent);
}

.section-header p {
  margin-top: 18px;
}

.project-grid,
.certification-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 56px 40px;
}

.project-item,
.certification-item {
  display: flex;
  flex-direction: column;
  transition: var(--transition-custom);
}

.project-visual {
  margin-bottom: 24px;
  border: 1px solid var(--outline);
  border-radius: 6px;
  padding: 24px;
  background: var(--surface-lowest);
  display: flex;
  justify-content: center;
  align-items: center;
  height: 160px;
  transition: var(--transition-custom);
}

.project-item:hover .project-visual {
  border-color: var(--accent);
  background: var(--surface-low);
}

.project-diagram-svg {
  width: 100%;
  max-width: 320px;
  height: auto;
}

/* SVG Nodes & Paths */
.node-box {
  fill: var(--surface);
  stroke: var(--outline);
  stroke-width: 1.5px;
  transition: var(--transition-fast);
}

.node-box.active {
  stroke: var(--accent);
  fill: var(--accent-muted);
}

.node-text {
  fill: var(--text);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  text-anchor: middle;
  transition: var(--transition-fast);
}

.node-subtext {
  fill: var(--dim);
  font-family: var(--font-mono);
  font-size: 9px;
  text-anchor: middle;
}

.node-line {
  stroke: var(--outline);
  stroke-width: 1.5px;
  stroke-dasharray: 4 4;
  transition: var(--transition-fast);
}

.node-path {
  fill: none;
  stroke: var(--outline);
  stroke-width: 1.5px;
  stroke-dasharray: 4 4;
  transition: var(--transition-fast);
}

.node-dot {
  fill: var(--accent);
}

.project-item:hover .node-box {
  stroke: var(--accent);
}
.project-item:hover .node-text {
  fill: var(--accent);
}
.project-item:hover .node-line,
.project-item:hover .node-path {
  stroke: var(--accent);
}

.project-meta,
.cert-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--outline);
  padding-bottom: 10px;
  margin-bottom: 20px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--dim);
}

.project-index,
.cert-index {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-style: italic;
  font-weight: 500;
  color: var(--accent);
}

.project-tag,
.cert-type {
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.project-content,
.cert-body {
  display: flex;
  flex-direction: column;
  flex: 1;
}

.project-content h3,
.cert-body h3 {
  margin: 0 0 14px;
  font-family: var(--font-serif);
  font-size: clamp(1.3rem, 2.5vw, 1.7rem);
  font-weight: 500;
  line-height: 1.25;
  color: var(--text);
}

.project-content p,
.cert-body p {
  margin: 0 0 20px;
  color: var(--muted);
  font-size: 0.94rem;
  line-height: 1.6;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 24px;
}

.tag {
  border: 1px solid var(--outline);
  border-radius: 4px;
  padding: 4px 8px;
  color: var(--muted);
  background: var(--surface-low);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

.project-links,
.cert-links {
  display: flex;
  gap: 16px;
  margin-top: auto;
}

.project-links a,
.cert-links a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--outline);
  padding-bottom: 2px;
  transition: var(--transition-fast);
}

.project-links a:hover,
.cert-links a:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.link-arrow {
  font-size: 13px;
  transition: transform 0.2s ease;
}

.project-links a:hover .link-arrow,
.cert-links a:hover .link-arrow {
  transform: translate(2px, -2px);
}

.skills-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(320px, 0.75fr);
  gap: 32px;
}

.skill-feature {
  padding: 32px;
}

.feature-title {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 26px;
}

.feature-title h3 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 500;
}

.feature-title .material-symbols-outlined {
  color: var(--accent);
  font-size: 28px;
}

.tech-icons {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0 0 28px;
}

.tech-icons img {
  width: 44px;
  height: 44px;
  border: 1px solid var(--outline);
  border-radius: 6px;
  padding: 8px;
  background: var(--surface-low);
  object-fit: contain;
  transition: var(--transition-fast);
}

.tech-icons img:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.skill-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 16px;
}

.skill-item {
  border-left: 2px solid var(--accent);
  padding: 0 0 0 16px;
}

.skill-item strong {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--text);
}

.code-card {
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.code-header {
  display: flex;
  align-items: center;
  padding: 12px 20px;
  background: var(--surface);
  border-bottom: 1px solid var(--outline);
}

.code-file {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--dim);
}

.code-card pre {
  flex: 1;
  min-height: 320px;
  margin: 0;
  overflow-x: auto;
  padding: 26px;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.88rem;
  line-height: 1.7;
}



.cert-meta {
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--dim);
}

.timeline {
  display: grid;
  gap: 28px;
  border-top: 1px solid var(--outline);
  padding-top: 24px;
}

.timeline-item {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 28px;
  padding: 20px;
  border: 1px solid var(--outline);
  border-radius: 6px;
  background: var(--surface-low);
  box-shadow:
    0 2px 8px -2px rgba(0, 0, 0, 0.04),
    0 8px 24px -4px rgba(0, 0, 0, 0.08);
  transition: var(--transition-custom);
}

body.light-theme .timeline-item {
  box-shadow:
    0 2px 8px -2px rgba(28, 12, 12, 0.02),
    0 8px 24px -4px rgba(28, 12, 12, 0.04);
}

.timeline-item strong {
  color: var(--accent);
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 500;
}

.contact-section {
  border-top: 1px solid var(--outline);
  padding: 112px 20px;
  background: var(--surface-lowest);
  transition: var(--transition-custom);
}

.contact-inner {
  width: min(680px, 100%);
  margin: 0 auto;
  text-align: center;
}

.contact-inner .section-label {
  justify-content: center;
}

.contact-inner h2 {
  max-width: 680px;
}

.contact-actions {
  justify-content: center;
}

.contact-email {
  display: inline-block;
  margin-top: 22px;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  border-bottom: 1px solid transparent;
  transition: var(--transition-fast);
}

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

.social-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 26px;
  margin-top: 48px;
  padding-top: 28px;
  border-top: 1px solid var(--outline);
}

.social-row a,
.footer {
  color: var(--dim);
  font-family: var(--font-mono);
  font-size: 0.8rem;
}

.social-row a:hover {
  color: var(--accent);
}

.footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  border-top: 1px solid var(--outline);
  padding: 34px max(var(--gutter), calc((100vw - var(--container)) / 2));
  background: var(--background);
  transition: var(--transition-custom);
}

.footer strong {
  color: var(--accent);
}

@media (max-width: 960px) {
  .topbar {
    min-height: 64px;
  }

  .nav-links,
  .resume-button {
    display: none;
  }

  .nav-links.open {
    position: absolute;
    top: 64px;
    left: 20px;
    right: 20px;
    display: grid;
    gap: 4px;
    border: 1px solid var(--outline);
    border-radius: 6px;
    padding: 12px;
    background: var(--surface);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
  }

  body.light-theme .nav-links.open {
    box-shadow: 0 10px 30px rgba(28, 12, 12, 0.08);
  }

  .nav-links.open a {
    padding: 12px;
  }

  .menu-button {
    display: inline-flex;
  }

  .hero,
  .about-grid,
  .skills-layout,
  .timeline-item {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    padding: 80px 0;
  }

  .project-grid,
  .certification-grid,
  .skill-list {
    grid-template-columns: 1fr;
  }

  .section {
    padding: 78px 0;
  }

  .timeline-item {
    gap: 12px;
  }
}

@media (max-width: 560px) {
  .brand {
    font-size: 0.92rem;
  }

  .hero {
    padding: 58px 0 66px;
  }

  .hero h1 {
    font-size: clamp(1.8rem, 10vw, 3.2rem);
  }

  .hero h1 em {
    font-size: clamp(1.4rem, 7.8vw, 2.2rem);
  }

  .hero-lead,
  .about-grid p:not(.section-label),
  .section-header p {
    font-size: 0.98rem;
    line-height: 1.65;
  }

  .hero-actions .button,
  .contact-actions .button {
    width: 100%;
  }

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

  .stat-grid div {
    border-left: 0;
    padding-left: 0;
  }

  .skill-feature {
    padding: 22px;
  }

  .section {
    padding: 64px 0;
  }

  .footer {
    align-items: flex-start;
    flex-direction: column;
  }
}