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

.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: 0.08s;
}

.zu-hero-content > .zu-animate-load:nth-child(2) {
  animation-delay: 0.18s;
}

.zu-hero-content > .zu-animate-load:nth-child(3) {
  animation-delay: 0.26s;
}

.zu-hero-content > .zu-animate-load:nth-child(4) {
  animation-delay: 0.34s;
}

.zu-hero-content > .zu-animate-load:nth-child(5) {
  animation-delay: 0.42s;
}

.zu-hero-content > .zu-animate-load:nth-child(6) {
  animation-delay: 0.5s;
}

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

@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: 1fr;
  }
}

@media (max-width: 820px) {
  .zu-header-inner {
    flex-wrap: wrap;
    padding: 0.65rem 0;
  }

  .zu-nav {
    margin-left: 0;
    order: 3;
    width: 100%;
  }

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

  .zu-nav-menu {
    display: grid;
    gap: 0.4rem;
    margin-top: 0.6rem;
    padding-top: 0.6rem;
    border-top: 1px solid var(--zu-border);
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height var(--zu-speed-base) ease, opacity var(--zu-speed-fast) ease;
  }

  .zu-nav.zu-nav-open .zu-nav-menu {
    max-height: 420px;
    opacity: 1;
  }

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

  .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 (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;
  }
}