:root {
  --zu-font-sans: "IBM Plex Sans", "Segoe UI", sans-serif;
  --zu-font-mono: "JetBrains Mono", "Consolas", monospace;
  --zu-radius-sm: 10px;
  --zu-radius-md: 16px;
  --zu-radius-lg: 24px;
  --zu-shadow-soft: 0 8px 26px rgba(15, 27, 45, 0.08);
  --zu-shadow-hover: 0 16px 38px rgba(15, 27, 45, 0.14);
  --zu-speed-fast: 0.26s;
  --zu-speed-base: 0.38s;
  --zu-speed-slow: 0.56s;
}

[data-zu-theme="light"] {
  --zu-bg-main: #f4f7fb;
  --zu-bg-surface: #ffffff;
  --zu-bg-muted: #ecf1f8;
  --zu-text-main: #1a2233;
  --zu-text-muted: #4f5c73;
  --zu-border: rgba(26, 34, 51, 0.12);
  --zu-accent: #2f6df6;
  --zu-accent-strong: #1552d7;
  --zu-accent-soft: rgba(47, 109, 246, 0.12);
  --zu-status-green: #16a34a;
  --zu-gradient: radial-gradient(circle at 10% 5%, #cddffd 0%, transparent 45%),
    radial-gradient(circle at 85% 18%, #d2f1ff 0%, transparent 40%),
    linear-gradient(180deg, #f6f9ff 0%, #f4f7fb 100%);
}

[data-zu-theme="dark"] {
  --zu-bg-main: #0d1422;
  --zu-bg-surface: #131e31;
  --zu-bg-muted: #17253c;
  --zu-text-main: #f2f6ff;
  --zu-text-muted: #b7c3da;
  --zu-border: rgba(183, 195, 218, 0.2);
  --zu-accent: #70a5ff;
  --zu-accent-strong: #8db8ff;
  --zu-accent-soft: rgba(112, 165, 255, 0.2);
  --zu-status-green: #22c55e;
  --zu-gradient: radial-gradient(circle at 10% 8%, rgba(53, 93, 177, 0.35) 0%, transparent 42%),
    radial-gradient(circle at 90% 10%, rgba(26, 122, 173, 0.3) 0%, transparent 35%),
    linear-gradient(180deg, #0f1828 0%, #0d1422 100%);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--zu-font-sans);
  background: var(--zu-bg-main);
  color: var(--zu-text-main);
  line-height: 1.65;
  letter-spacing: 0.01em;
  transition: background var(--zu-speed-base) ease, color var(--zu-speed-base) ease;
}

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

img {
  max-width: 100%;
}

.zu-container {
  width: min(1120px, 92vw);
  margin: 0 auto;
}

.zu-skip-link {
  position: fixed;
  top: -40px;
  left: 12px;
  z-index: 999;
  background: var(--zu-accent);
  color: #fff;
  padding: 0.5rem 0.75rem;
  border-radius: 8px;
  transition: top var(--zu-speed-fast) ease;
}

.zu-skip-link:focus-visible {
  top: 12px;
}

.zu-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(14px);
  background: color-mix(in srgb, var(--zu-bg-main) 88%, transparent);
  border-bottom: 1px solid var(--zu-border);
}

.zu-header-inner {
  position: relative;
  min-height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.zu-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  flex-shrink: 0;
}

.zu-brand-mark {
  width: 2.05rem;
  height: 2.05rem;
  border-radius: 50%;
  border: 1px solid var(--zu-border);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--zu-font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  background: var(--zu-bg-surface);
}

.zu-brand-text {
  font-weight: 700;
  font-size: 1rem;
}

.zu-nav {
  margin-left: auto;
}

.zu-nav-toggle {
  display: none;
  width: 2.8rem;
  height: 2.8rem;
  border-radius: 10px;
  border: 1px solid var(--zu-border);
  background: var(--zu-bg-surface);
  cursor: pointer;
  padding: 0.58rem;
}

.zu-nav-toggle-bar {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--zu-text-main);
  border-radius: 999px;
  margin: 0.29rem 0;
  transition: transform var(--zu-speed-fast) ease, opacity var(--zu-speed-fast) ease;
}

.zu-nav-menu {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.zu-nav-link {
  display: inline-flex;
  align-items: center;
  padding: 0.55rem 0.75rem;
  border-radius: 9px;
  color: var(--zu-text-muted);
  font-size: 0.95rem;
  transition: color var(--zu-speed-fast) ease, background var(--zu-speed-fast) ease;
}

.zu-nav-link:hover,
.zu-nav-link:focus-visible,
.zu-nav-link.zu-nav-link-active {
  color: var(--zu-text-main);
  background: var(--zu-bg-muted);
}

.zu-theme-toggle {
  border: 1px solid var(--zu-border);
  background: var(--zu-bg-surface);
  color: var(--zu-text-main);
  border-radius: 999px;
  padding: 0.45rem 0.78rem;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  cursor: pointer;
  font-size: 0.86rem;
  font-weight: 600;
  transition: border-color var(--zu-speed-fast) ease, transform var(--zu-speed-fast) ease,
    background var(--zu-speed-fast) ease;
}

.zu-theme-toggle:hover,
.zu-theme-toggle:focus-visible {
  border-color: var(--zu-accent);
  transform: translateY(-1px);
}

.zu-theme-toggle-icon {
  font-size: 1rem;
}

.zu-section {
  padding: 5.8rem 0;
  scroll-margin-top: 96px;
}

.zu-hero {
  padding-top: 6.8rem;
  background: var(--zu-gradient);
}

.zu-hero-grid {
  display: grid;
  gap: 2rem;
  grid-template-columns: 1.45fr 1fr;
  align-items: start;
}

.zu-eyebrow,
.zu-section-kicker {
  margin: 0;
  font-size: 0.82rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--zu-accent-strong);
  font-family: var(--zu-font-mono);
}

.zu-section-kicker {
  text-transform: none;
  letter-spacing: 0.04em;
  font-size: 0.86rem;
}

.zu-hero-title {
  margin: 0.55rem 0 0;
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  line-height: 1.1;
}

.zu-hero-intro {
  margin: 1.2rem 0 0;
  max-width: 64ch;
  color: var(--zu-text-muted);
  font-size: 1.05rem;
}

.zu-hero-tagline {
  margin: 1rem 0 0;
  font-size: 1.1rem;
  color: var(--zu-text-main);
}

.zu-hero-actions {
  margin-top: 1.8rem;
  display: flex;
  gap: 0.8rem;
  flex-wrap: wrap;
}

.zu-button {
  border-radius: 11px;
  border: 1px solid transparent;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.68rem 1.18rem;
  font-weight: 600;
  line-height: 1;
  cursor: pointer;
  transition: transform var(--zu-speed-fast) ease, box-shadow var(--zu-speed-fast) ease,
    background var(--zu-speed-fast) ease, color var(--zu-speed-fast) ease,
    border-color var(--zu-speed-fast) ease;
}

.zu-button:hover,
.zu-button:focus-visible {
  transform: translateY(-2px);
}

.zu-button-primary {
  background: var(--zu-accent);
  color: #fff;
  box-shadow: 0 10px 28px color-mix(in srgb, var(--zu-accent) 28%, transparent);
}

.zu-button-primary:hover,
.zu-button-primary:focus-visible {
  background: var(--zu-accent-strong);
}

.zu-button-secondary {
  border-color: var(--zu-border);
  background: var(--zu-bg-surface);
  color: var(--zu-text-main);
}

.zu-button-secondary:hover,
.zu-button-secondary:focus-visible {
  border-color: var(--zu-accent);
}

.zu-social-list {
  list-style: none;
  padding: 0;
  margin: 1.5rem 0 0;
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.zu-social-link {
  padding: 0.44rem 0.74rem;
  border-radius: 999px;
  border: 1px solid var(--zu-border);
  color: var(--zu-text-muted);
  background: var(--zu-bg-surface);
  transition: transform var(--zu-speed-fast) ease, color var(--zu-speed-fast) ease,
    border-color var(--zu-speed-fast) ease;
}

.zu-social-link:hover,
.zu-social-link:focus-visible {
  color: var(--zu-text-main);
  border-color: var(--zu-accent);
  transform: translateY(-1px);
}

.zu-hero-card {
  background: var(--zu-bg-surface);
  border: 1px solid var(--zu-border);
  border-radius: var(--zu-radius-lg);
  padding: 1.6rem;
  box-shadow: var(--zu-shadow-soft);
}

.zu-hero-photo {
  position: relative;
  width: 200px;
  height: 200px;
  margin: 0 auto 1.4rem;
  border-radius: 50%;
}

.zu-hero-photo::before {
  content: "";
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  background: conic-gradient(
    from 140deg,
    var(--zu-accent) 0deg,
    var(--zu-accent-strong) 110deg,
    var(--zu-status-green) 200deg,
    var(--zu-accent) 360deg
  );
  z-index: 0;
  animation: zu-ring-spin 22s linear infinite;
}

.zu-hero-photo img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
  object-position: center top;
  border: 4px solid var(--zu-bg-surface);
  background: var(--zu-bg-muted);
  box-shadow: 0 12px 32px color-mix(in srgb, var(--zu-accent) 22%, transparent);
}

@keyframes zu-ring-spin {
  to { transform: rotate(360deg); }
}

.zu-card-title {
  margin: 0;
  font-size: 1rem;
}

.zu-hero-focus-list {
  margin: 1rem 0 0;
  padding-left: 1.2rem;
  color: var(--zu-text-muted);
}

.zu-hero-focus-list li + li {
  margin-top: 0.52rem;
}

.zu-edu-grid {
  margin-top: 1.7rem;
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.zu-edu-card {
  background: var(--zu-bg-surface);
  border: 1px solid var(--zu-border);
  border-radius: var(--zu-radius-md);
  box-shadow: var(--zu-shadow-soft);
  padding: 1.3rem;
  transition: transform var(--zu-speed-base) ease, box-shadow var(--zu-speed-base) ease,
    border-color var(--zu-speed-base) ease, background var(--zu-speed-base) ease;
}

[data-zu-theme="dark"] .zu-edu-card {
  box-shadow: none;
}

.zu-edu-card:hover {
  transform: translateY(-4px);
  border-color: color-mix(in srgb, var(--zu-accent) 42%, var(--zu-border));
  box-shadow: var(--zu-shadow-hover);
}

[data-zu-theme="dark"] .zu-edu-card:hover {
  box-shadow: none;
  background: color-mix(in srgb, var(--zu-bg-surface) 88%, var(--zu-accent-soft));
}

.zu-edu-range {
  margin: 0;
  font-size: 0.82rem;
  color: var(--zu-accent-strong);
  font-family: var(--zu-font-mono);
}

.zu-edu-card h3 {
  margin: 0.45rem 0 0;
  font-size: 1.08rem;
}

.zu-edu-program {
  margin: 0.4rem 0 0;
  color: var(--zu-text-muted);
}

.zu-section-heading h2 {
  margin: 0.5rem 0 0;
  font-size: clamp(1.6rem, 3vw, 2.25rem);
}

.zu-section-intro {
  margin: 1rem 0 0;
  max-width: 74ch;
  color: var(--zu-text-muted);
}

.zu-about-card,
.zu-contact-card,
.zu-timeline-card,
.zu-skill-group,
.zu-project-card {
  background: var(--zu-bg-surface);
  border: 1px solid var(--zu-border);
  border-radius: var(--zu-radius-md);
  box-shadow: var(--zu-shadow-soft);
  transition: transform var(--zu-speed-base) ease, box-shadow var(--zu-speed-base) ease,
    border-color var(--zu-speed-base) ease, background var(--zu-speed-base) ease;
}

[data-zu-theme="dark"] .zu-about-card,
[data-zu-theme="dark"] .zu-contact-card,
[data-zu-theme="dark"] .zu-timeline-card,
[data-zu-theme="dark"] .zu-skill-group,
[data-zu-theme="dark"] .zu-project-card {
  box-shadow: none;
}

.zu-about-card {
  margin-top: 1.6rem;
  padding: 1.5rem;
}

.zu-about-card p {
  margin: 0;
  color: var(--zu-text-muted);
}

.zu-about-card p + p {
  margin-top: 1rem;
}

.zu-timeline {
  margin-top: 1.7rem;
  position: relative;
  display: grid;
  gap: 1rem;
}

.zu-timeline::before {
  content: "";
  position: absolute;
  left: 13px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: color-mix(in srgb, var(--zu-accent) 32%, transparent);
}

.zu-timeline-item {
  position: relative;
  padding-left: 2.15rem;
}

.zu-timeline-dot {
  position: absolute;
  left: 7px;
  top: 1.2rem;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--zu-accent);
  box-shadow: 0 0 0 5px var(--zu-accent-soft);
}

.zu-timeline-card {
  padding: 1.3rem 1.3rem 1.15rem;
}

.zu-timeline-range {
  margin: 0;
  font-size: 0.82rem;
  color: var(--zu-accent-strong);
  font-family: var(--zu-font-mono);
}

.zu-timeline-card h3 {
  margin: 0.45rem 0 0;
  font-size: 1.12rem;
}

.zu-timeline-role {
  margin: 0.4rem 0 0;
  color: var(--zu-text-muted);
}

.zu-timeline-list {
  margin: 0.8rem 0 0;
  padding-left: 1.15rem;
  color: var(--zu-text-muted);
}

.zu-timeline-list li + li {
  margin-top: 0.45rem;
}

.zu-skill-groups {
  margin-top: 1.7rem;
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.zu-skill-group {
  padding: 1.1rem 1.2rem;
}

.zu-skill-group h3 {
  margin: 0;
  font-size: 1rem;
}

.zu-badge-wrap {
  margin-top: 0.85rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.zu-skill-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.3rem 0.58rem;
  border-radius: 999px;
  font-size: 0.82rem;
  border: 1px solid var(--zu-border);
  color: var(--zu-text-muted);
  background: var(--zu-bg-muted);
  transition: border-color var(--zu-speed-fast) ease, color var(--zu-speed-fast) ease,
    transform var(--zu-speed-fast) ease;
}

.zu-skill-badge:hover {
  transform: translateY(-1px);
  border-color: var(--zu-accent);
  color: var(--zu-text-main);
}

.zu-project-grid {
  margin-top: 1.7rem;
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.zu-project-card {
  padding: 1.15rem;
  display: flex;
  flex-direction: column;
}

.zu-project-card[hidden] {
  display: none !important;
}

.zu-project-card h3 {
  margin: 0;
  font-size: 1.04rem;
}

.zu-project-card p {
  margin: 0.7rem 0 0;
  color: var(--zu-text-muted);
}

.zu-project-tag {
  margin-top: 0.95rem;
  width: fit-content;
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--zu-accent-strong);
  background: var(--zu-accent-soft);
  border-radius: 999px;
  padding: 0.28rem 0.48rem;
}

.zu-inline-link {
  margin-top: auto;
  padding-top: 1rem;
  font-weight: 600;
  color: var(--zu-accent-strong);
}

.zu-inline-link:hover,
.zu-inline-link:focus-visible {
  text-decoration: underline;
}

.zu-project-card:hover,
.zu-project-card:focus-within,
.zu-skill-group:hover,
.zu-contact-card:hover,
.zu-timeline-card:hover {
  transform: translateY(-4px);
  border-color: color-mix(in srgb, var(--zu-accent) 42%, var(--zu-border));
  box-shadow: var(--zu-shadow-hover);
}

[data-zu-theme="dark"] .zu-project-card:hover,
[data-zu-theme="dark"] .zu-project-card:focus-within,
[data-zu-theme="dark"] .zu-skill-group:hover,
[data-zu-theme="dark"] .zu-contact-card:hover,
[data-zu-theme="dark"] .zu-timeline-card:hover {
  box-shadow: none;
  background: color-mix(in srgb, var(--zu-bg-surface) 88%, var(--zu-accent-soft));
}

.zu-project-actions {
  display: flex;
  justify-content: center;
  margin-top: 1.4rem;
}

.zu-contact-grid {
  margin-top: 1.7rem;
}

.zu-contact-card {
  padding: 1.4rem;
}

.zu-contact-card h3 {
  margin: 0;
}

.zu-contact-card > p {
  margin: 0.85rem 0 0;
  color: var(--zu-text-muted);
}

.zu-contact-list {
  margin: 1rem 0 0;
  list-style: none;
  padding: 0;
  display: grid;
  gap: 0.7rem;
}

.zu-contact-list li {
  border: 1px solid var(--zu-border);
  border-radius: 10px;
  padding: 0.65rem 0.75rem;
  background: var(--zu-bg-muted);
  display: grid;
  gap: 0.2rem;
}

.zu-contact-label {
  font-size: 0.78rem;
  color: var(--zu-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.zu-contact-list a {
  color: var(--zu-accent-strong);
}

.zu-footer {
  border-top: 1px solid var(--zu-border);
  padding: 1.35rem 0;
}

.zu-footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.8rem 1rem;
  justify-content: space-between;
}

.zu-footer-copy {
  margin: 0;
  color: var(--zu-text-muted);
}

.zu-footer-nav,
.zu-footer-social {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.zu-footer-nav a,
.zu-footer-social a {
  color: var(--zu-text-muted);
  transition: color var(--zu-speed-fast) ease;
}

.zu-footer-nav a:hover,
.zu-footer-nav a:focus-visible,
.zu-footer-social a:hover,
.zu-footer-social a:focus-visible {
  color: var(--zu-text-main);
}

.zu-nav-link:focus-visible,
.zu-button:focus-visible,
.zu-theme-toggle:focus-visible,
.zu-social-link:focus-visible,
.zu-inline-link:focus-visible,
.zu-footer-nav a:focus-visible,
.zu-footer-social a:focus-visible,
.zu-nav-toggle:focus-visible {
  outline: 2px solid var(--zu-accent);
  outline-offset: 2px;
}

.zu-theme-toggle-footer {
  padding-inline: 0.62rem;
}

.zu-reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--zu-speed-slow) ease, transform var(--zu-speed-slow) ease;
}

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

.zu-animate-load {
  opacity: 0;
  transform: translateY(14px);
  animation: zu-fade-up 0.8s ease forwards;
}

.zu-hero-content > .zu-animate-load:nth-child(1) {
  animation-delay: 0.04s;
}

.zu-hero-content > .zu-animate-load:nth-child(2) {
  animation-delay: 0.12s;
}

.zu-hero-content > .zu-animate-load:nth-child(3) {
  animation-delay: 0.2s;
}

.zu-hero-content > .zu-animate-load:nth-child(4) {
  animation-delay: 0.28s;
}

.zu-hero-content > .zu-animate-load:nth-child(5) {
  animation-delay: 0.36s;
}

.zu-hero-content > .zu-animate-load:nth-child(6) {
  animation-delay: 0.44s;
}

.zu-hero-content > .zu-animate-load:nth-child(7) {
  animation-delay: 0.52s;
}

@keyframes zu-fade-up {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Availability status pill */
.zu-status-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.32rem 0.72rem;
  border-radius: 999px;
  border: 1px solid color-mix(in srgb, var(--zu-status-green) 40%, transparent);
  background: color-mix(in srgb, var(--zu-status-green) 12%, transparent);
  color: color-mix(in srgb, var(--zu-status-green) 80%, var(--zu-text-main));
  font-family: var(--zu-font-mono);
  font-size: 0.76rem;
  font-weight: 600;
  margin: 0 0 0.85rem;
  width: fit-content;
}

.zu-status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--zu-status-green);
  box-shadow: 0 0 0 0 color-mix(in srgb, var(--zu-status-green) 65%, transparent);
  animation: zu-pulse 1.8s ease-out infinite;
}

@keyframes zu-pulse {
  0% {
    box-shadow: 0 0 0 0 color-mix(in srgb, var(--zu-status-green) 65%, transparent);
  }
  70% {
    box-shadow: 0 0 0 10px color-mix(in srgb, var(--zu-status-green) 0%, transparent);
  }
  100% {
    box-shadow: 0 0 0 0 color-mix(in srgb, var(--zu-status-green) 0%, transparent);
  }
}

/* Blinking caret on hero title */
.zu-caret {
  display: inline-block;
  margin-left: 0.12em;
  color: var(--zu-accent);
  font-weight: 400;
  animation: zu-blink 1s steps(2, start) infinite;
}

@keyframes zu-blink {
  to {
    opacity: 0;
  }
}

/* Code-window snippet (hero) */
.zu-code-window {
  margin-top: 0.4rem;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 12px;
  background: #0b1220;
  overflow: hidden;
  font-family: var(--zu-font-mono);
  box-shadow: 0 14px 34px rgba(7, 12, 24, 0.35);
}

.zu-code-window-bar {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.55rem 0.8rem;
  background: rgba(255, 255, 255, 0.04);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.zu-code-dot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  display: inline-block;
}

.zu-code-dot--red {
  background: #ff5f57;
}

.zu-code-dot--yellow {
  background: #febc2e;
}

.zu-code-dot--green {
  background: #28c840;
}

.zu-code-window-title {
  margin-left: 0.6rem;
  font-size: 0.76rem;
  color: rgba(226, 232, 240, 0.55);
  letter-spacing: 0.02em;
}

.zu-code-window-body {
  margin: 0;
  padding: 1rem 1.1rem;
  font-size: 0.82rem;
  line-height: 1.6;
  color: #e2e8f0;
  white-space: pre;
  overflow-x: auto;
}

.zu-code-window-body code {
  font-family: inherit;
}

.zu-tok-kw {
  color: #c084fc;
}

.zu-tok-cls {
  color: #fbbf24;
}

.zu-tok-var {
  color: #60a5fa;
}

.zu-tok-str {
  color: #34d399;
}

.zu-tok-num,
.zu-tok-bool {
  color: #f472b6;
}

.zu-tok-comment {
  color: #64748b;
  font-style: italic;
}

/* Stats row (about) */
.zu-stats-row {
  margin: 1.7rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.85rem;
}

.zu-stat {
  border: 1px solid var(--zu-border);
  border-radius: var(--zu-radius-md);
  padding: 1.1rem 1.2rem;
  background: var(--zu-bg-surface);
  box-shadow: var(--zu-shadow-soft);
  transition: transform var(--zu-speed-base) ease, border-color var(--zu-speed-base) ease,
    box-shadow var(--zu-speed-base) ease;
}

[data-zu-theme="dark"] .zu-stat {
  box-shadow: none;
}

.zu-stat:hover {
  transform: translateY(-3px);
  border-color: color-mix(in srgb, var(--zu-accent) 42%, var(--zu-border));
}

.zu-stat-num {
  margin: 0;
  font-family: var(--zu-font-mono);
  font-size: 2rem;
  font-weight: 700;
  color: var(--zu-accent-strong);
  line-height: 1;
  display: block;
}

.zu-stat-plus {
  color: var(--zu-status-green);
  margin-left: 0.05em;
}

.zu-stat-label {
  display: block;
  margin: 0.5rem 0 0;
  color: var(--zu-text-muted);
  font-size: 0.88rem;
}

/* Project card meta */
.zu-project-head {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.55rem;
  color: var(--zu-text-muted);
}

.zu-project-glyph {
  font-family: var(--zu-font-mono);
  font-size: 0.74rem;
  color: var(--zu-accent-strong);
  background: var(--zu-accent-soft);
  padding: 0.16rem 0.42rem;
  border-radius: 6px;
  letter-spacing: 0.04em;
}

.zu-project-domain {
  margin: 0;
  min-width: 0;
  font-family: var(--zu-font-mono);
  font-size: 0.78rem;
  color: var(--zu-text-muted);
  letter-spacing: 0.01em;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* External-link arrow */
.zu-link-arrow {
  display: inline-block;
  margin-left: 0.32em;
  transition: transform var(--zu-speed-fast) ease;
}

.zu-inline-link:hover .zu-link-arrow,
.zu-inline-link:focus-visible .zu-link-arrow {
  transform: translate(2px, -2px);
}

@media (max-width: 1060px) {
  .zu-project-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .zu-skill-groups {
    grid-template-columns: 1fr;
  }

  .zu-hero-grid {
    grid-template-columns: 1.2fr 1fr;
  }

  .zu-code-window-body {
    font-size: 0.78rem;
    padding: 0.9rem 0.95rem;
  }
}

@media (max-width: 900px) {
  .zu-hero-grid {
    grid-template-columns: 1fr;
  }

  .zu-hero-card {
    max-width: 520px;
    margin-left: auto;
    margin-right: auto;
    width: 100%;
  }

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

  .zu-section-heading h2 {
    font-size: clamp(1.5rem, 4vw, 2rem);
  }
}

@media (max-width: 820px) {
  .zu-header-inner {
    padding: 0.55rem 0;
    min-height: 64px;
  }

  .zu-nav-toggle {
    display: inline-block;
  }

  .zu-nav-menu {
    position: absolute;
    top: calc(100% + 0.55rem);
    left: 0;
    right: 0;
    margin: 0;
    padding: 0.5rem;
    display: grid;
    gap: 0.25rem;
    background: var(--zu-bg-surface);
    border: 1px solid var(--zu-border);
    border-radius: var(--zu-radius-md);
    box-shadow: var(--zu-shadow-soft);
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    pointer-events: none;
    transition: max-height var(--zu-speed-base) ease, opacity var(--zu-speed-fast) ease,
      transform var(--zu-speed-fast) ease;
    transform: translateY(-4px);
  }

  .zu-nav.zu-nav-open .zu-nav-menu {
    max-height: 480px;
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }

  .zu-nav-link {
    width: 100%;
    justify-content: flex-start;
    padding: 0.6rem 0.8rem;
  }

  .zu-nav.zu-nav-open .zu-nav-toggle-bar:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
  }

  .zu-nav.zu-nav-open .zu-nav-toggle-bar:nth-child(2) {
    opacity: 0;
  }

  .zu-nav.zu-nav-open .zu-nav-toggle-bar:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
  }

  .zu-project-grid {
    grid-template-columns: 1fr;
  }

  .zu-section {
    padding: 4.6rem 0;
  }

  .zu-hero {
    padding-top: 5.4rem;
  }
}

@media (max-width: 720px) {
  .zu-edu-grid {
    grid-template-columns: 1fr;
  }

  .zu-stats-row {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0.6rem;
  }

  .zu-stat {
    padding: 0.85rem 0.85rem;
  }

  .zu-stat-num {
    font-size: 1.6rem;
  }

  .zu-stat-label {
    font-size: 0.78rem;
  }

  .zu-hero-photo {
    width: 168px;
    height: 168px;
  }

  .zu-code-window-body {
    font-size: 0.74rem;
    padding: 0.85rem 0.9rem;
  }
}

@media (max-width: 540px) {
  .zu-container {
    width: min(1120px, 94vw);
  }

  .zu-section {
    padding: 3.6rem 0;
    scroll-margin-top: 80px;
  }

  .zu-hero {
    padding-top: 4.4rem;
  }

  .zu-hero-title {
    font-size: clamp(1.85rem, 8vw, 2.4rem);
  }

  .zu-hero-intro {
    font-size: 1rem;
  }

  .zu-hero-tagline {
    font-size: 0.95rem;
  }

  .zu-hero-actions {
    gap: 0.6rem;
  }

  .zu-hero-actions .zu-button {
    flex: 1 1 auto;
    justify-content: center;
    padding: 0.66rem 1rem;
  }

  .zu-hero-card {
    padding: 1.2rem;
  }

  .zu-hero-photo {
    width: 156px;
    height: 156px;
    margin-bottom: 1.1rem;
  }

  .zu-section-heading h2 {
    font-size: clamp(1.4rem, 5.5vw, 1.85rem);
  }

  .zu-stats-row {
    grid-template-columns: 1fr 1fr;
    gap: 0.55rem;
  }

  .zu-stats-row > .zu-stat:nth-child(3) {
    grid-column: 1 / -1;
  }

  .zu-stat-num {
    font-size: 1.7rem;
  }

  .zu-timeline {
    margin-top: 1.4rem;
  }

  .zu-timeline-item {
    padding-left: 1.85rem;
  }

  .zu-timeline-card {
    padding: 1.05rem 1.05rem 0.95rem;
  }

  .zu-timeline-card h3 {
    font-size: 1.05rem;
  }

  .zu-project-card,
  .zu-edu-card,
  .zu-contact-card,
  .zu-about-card {
    padding: 1.1rem;
  }

  .zu-skill-group {
    padding: 1rem 1.05rem;
  }

  .zu-skill-badge {
    font-size: 0.78rem;
  }

  .zu-code-window-body {
    font-size: 0.7rem;
    padding: 0.8rem 0.85rem;
    line-height: 1.55;
  }

  .zu-code-window-title {
    font-size: 0.7rem;
  }

  .zu-header-inner {
    min-height: 64px;
  }

  .zu-brand-text {
    font-size: 0.95rem;
  }

  .zu-header .zu-theme-toggle .zu-theme-toggle-text {
    display: none;
  }

  .zu-header .zu-theme-toggle {
    padding: 0.4rem 0.55rem;
  }

  .zu-status-pill {
    font-size: 0.72rem;
    padding: 0.28rem 0.6rem;
  }

  .zu-contact-list li {
    padding: 0.6rem 0.7rem;
  }

  .zu-footer-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.55rem;
  }
}

@media (max-width: 380px) {
  .zu-hero-photo {
    width: 132px;
    height: 132px;
  }

  .zu-hero-title {
    font-size: clamp(1.65rem, 8.5vw, 2rem);
  }

  .zu-hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

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

  .zu-stats-row {
    grid-template-columns: 1fr;
  }

  .zu-stats-row > .zu-stat:nth-child(3) {
    grid-column: auto;
  }

  .zu-brand-mark {
    width: 1.85rem;
    height: 1.85rem;
    font-size: 0.72rem;
  }

  .zu-section-heading h2 {
    font-size: clamp(1.3rem, 6vw, 1.7rem);
  }

  .zu-code-window-body {
    font-size: 0.66rem;
  }
}

@media (max-height: 520px) and (orientation: landscape) {
  .zu-hero {
    padding-top: 4.4rem;
    padding-bottom: 3rem;
  }

  .zu-section {
    padding: 3.4rem 0;
  }

  .zu-hero-photo {
    width: 144px;
    height: 144px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .zu-reveal,
  .zu-animate-load {
    opacity: 1 !important;
    transform: none !important;
    animation: none !important;
  }
}