:root {
  --color-bg:           #ffffff;
  --color-bg-secondary: #faf9f7;
  --color-bg-card:      #ffffff;
  --color-bg-card-hover:#fdf8f2;
  --color-border:       #e7e5e4;
  --color-border-subtle:#f5f5f4;

  --color-accent:       #881337;
  --color-accent-dim:   rgba(136, 19, 55, 0.08);
  --color-accent-glow:  rgba(136, 19, 55, 0.2);
  --color-accent-2:     #b45309;

  --color-text-primary: #1c1917;
  --color-text-secondary:#57534e;
  --color-text-muted:   #a8a29e;
  --color-text-code:    #7f1d1d;

  --font-sans:  'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono:  'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;

  --text-xs:    0.75rem;
  --text-sm:    0.875rem;
  --text-base:  1rem;
  --text-lg:    1.125rem;
  --text-xl:    1.25rem;
  --text-2xl:   1.5rem;
  --text-3xl:   1.875rem;
  --text-4xl:   2.25rem;
  --text-5xl:   3rem;
  --text-6xl:   3.75rem;

  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  --container-max:  1100px;
  --nav-height:     64px;
  --radius-sm:      4px;
  --radius-md:      8px;
  --radius-lg:      12px;
  --radius-xl:      16px;
  --radius-full:    9999px;

  --shadow-sm:   0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md:   0 4px 16px rgba(0, 0, 0, 0.1);
  --shadow-lg:   0 8px 32px rgba(0, 0, 0, 0.12);
  --shadow-glow: 0 0 24px var(--color-accent-glow);

  --transition-fast:   150ms ease;
  --transition-base:   250ms ease;
  --transition-slow:   400ms ease;

  --reveal-duration:   600ms;
  --reveal-easing:     cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

ul, ol {
  list-style: none;
}

img, svg {
  display: block;
  max-width: 100%;
}

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

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--space-6);
}

.section {
  padding-block: var(--space-24);
}

.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition:
    opacity var(--reveal-duration) var(--reveal-easing),
    transform var(--reveal-duration) var(--reveal-easing);
}

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

.reveal:nth-child(2) { transition-delay: 80ms; }
.reveal:nth-child(3) { transition-delay: 160ms; }
.reveal:nth-child(4) { transition-delay: 240ms; }
.reveal:nth-child(5) { transition-delay: 320ms; }

.section__header {
  margin-bottom: var(--space-16);
  text-align: center;
}

.section__title {
  font-size: var(--text-3xl);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-text-primary);
}

.section__divider {
  width: 48px;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-2));
  border-radius: var(--radius-full);
  margin: var(--space-4) auto 0;
}

.section__subtitle {
  margin-top: var(--space-4);
  color: var(--color-text-secondary);
  font-size: var(--text-base);
  font-style: italic;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-3) var(--space-8);
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.01em;
  cursor: pointer;
  transition:
    background-color var(--transition-base),
    box-shadow var(--transition-base),
    transform var(--transition-fast),
    color var(--transition-base),
    border-color var(--transition-base);
  text-decoration: none;
  white-space: nowrap;
}

.btn:active {
  transform: translateY(1px);
}

.btn--primary {
  background-color: var(--color-accent);
  color: #ffffff;
  border: 2px solid var(--color-accent);
}

.btn--primary:hover {
  background-color: #6f0f2b;
  border-color: #6f0f2b;
  box-shadow: var(--shadow-glow);
}

.btn--secondary {
  background-color: transparent;
  color: var(--color-accent);
  border: 2px solid var(--color-accent);
}

.btn--secondary:hover {
  background-color: var(--color-accent-dim);
  box-shadow: var(--shadow-glow);
}

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  background-color: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: background-color var(--transition-base), box-shadow var(--transition-base);
}

.nav.is-scrolled {
  background-color: rgba(255, 255, 255, 0.96);
  box-shadow: var(--shadow-md);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--container-max);
  height: 100%;
  margin-inline: auto;
  padding-inline: var(--space-6);
  gap: var(--space-8);
}

.nav__logo {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-2));
  border-radius: var(--radius-md);
  flex-shrink: 0;
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.nav__logo:hover {
  box-shadow: var(--shadow-glow);
  transform: translateY(-1px);
}

.nav__logo-text {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: var(--text-sm);
  color: var(--color-bg);
  letter-spacing: 0.02em;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.nav__link {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.nav__link:hover {
  color: var(--color-text-primary);
  background-color: rgba(0, 0, 0, 0.05);
}

.nav__link.is-active {
  color: var(--color-accent);
}

.nav__link--cta {
  color: var(--color-accent);
  border: 1px solid rgba(136, 19, 55, 0.4);
  background-color: var(--color-accent-dim);
}

.nav__link--cta:hover {
  background-color: rgba(136, 19, 55, 0.12);
  color: var(--color-accent);
}

.nav__hamburger {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 24px;
  height: 18px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  flex-shrink: 0;
}

.nav__hamburger-bar {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-text-secondary);
  border-radius: var(--radius-full);
  transition: transform var(--transition-base), opacity var(--transition-base), background-color var(--transition-fast);
}

.nav__hamburger[aria-expanded="true"] .nav__hamburger-bar:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
  background-color: var(--color-accent);
}

.nav__hamburger[aria-expanded="true"] .nav__hamburger-bar:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.nav__hamburger[aria-expanded="true"] .nav__hamburger-bar:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
  background-color: var(--color-accent);
}

.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding-top: var(--nav-height);
  overflow: hidden;
}

.hero__bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 25% 25%, rgba(136, 19, 55, 0.07) 0%, transparent 50%),
    radial-gradient(circle at 75% 75%, rgba(180, 83, 9, 0.05) 0%, transparent 50%),
    radial-gradient(rgba(136, 19, 55, 0.06) 1px, transparent 1px);
  background-size: auto, auto, 32px 32px;
  z-index: 0;
}

.hero__content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 760px;
  padding-inline: var(--space-6);
  animation: heroFadeUp 0.8s var(--reveal-easing) both;
}

@keyframes heroFadeUp {
  from {
    opacity: 0;
    transform: translateY(32px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero__eyebrow {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-accent);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: var(--space-3);
  animation: heroFadeUp 0.8s var(--reveal-easing) 0.1s both;
}

.hero__name {
  font-size: clamp(var(--text-4xl), 7vw, var(--text-6xl));
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  color: var(--color-text-primary);
  margin-bottom: var(--space-4);
  animation: heroFadeUp 0.8s var(--reveal-easing) 0.2s both;
}

.hero__tagline {
  font-size: clamp(var(--text-lg), 3vw, var(--text-2xl));
  font-weight: 400;
  color: var(--color-text-secondary);
  letter-spacing: -0.01em;
  margin-bottom: var(--space-6);
  animation: heroFadeUp 0.8s var(--reveal-easing) 0.3s both;
}

.hero__tagline-separator {
  color: var(--color-accent);
  margin-inline: var(--space-2);
}

.hero__bio {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  line-height: 1.75;
  max-width: 580px;
  margin-inline: auto;
  margin-bottom: var(--space-10);
  animation: heroFadeUp 0.8s var(--reveal-easing) 0.4s both;
}

.hero__actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  flex-wrap: wrap;
  animation: heroFadeUp 0.8s var(--reveal-easing) 0.5s both;
}

.hero__scroll-indicator {
  position: absolute;
  bottom: var(--space-8);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  opacity: 0.4;
  animation: heroFadeUp 0.8s var(--reveal-easing) 1s both;
}

.hero__scroll-text {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
}

.hero__scroll-line {
  width: 1px;
  height: 48px;
  background: linear-gradient(to bottom, var(--color-text-secondary), transparent);
  animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
  0%, 100% { opacity: 0.4; transform: scaleY(1); }
  50%       { opacity: 0.8; transform: scaleY(1.1); }
}

.about {
  background-color: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.about__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-12);
  align-items: start;
}

.about__content {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.about__summary {
  font-size: var(--text-base);
  line-height: 1.75;
  color: var(--color-text-secondary);
}

.about__skills-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border);
}

.about__skill-category-title {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-1);
}

.about__skill-category-items {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.5;
}

.skills__groups {
  display: flex;
  flex-direction: column;
  gap: var(--space-10);
}

.skills__group {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.skills__group-title {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  padding-bottom: var(--space-2);
  border-bottom: 1px solid var(--color-border);
}

.skills__tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-3);
}

.skills__tag {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-code);
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-1) var(--space-4);
  transition:
    background-color var(--transition-fast),
    border-color var(--transition-fast),
    color var(--transition-fast),
    box-shadow var(--transition-fast),
    transform var(--transition-fast);
  cursor: default;
}

.skills__tag:hover {
  background-color: var(--color-accent-dim);
  border-color: var(--color-accent);
  color: var(--color-accent);
  box-shadow: 0 0 12px rgba(136, 19, 55, 0.15);
  transform: translateY(-1px);
}

.projects {
  background-color: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.projects__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

.project-card {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition:
    transform var(--transition-base),
    box-shadow var(--transition-base),
    border-color var(--transition-base);
}

.project-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg), 0 0 30px rgba(136, 19, 55, 0.08);
  border-color: rgba(88, 166, 255, 0.3);
}

.project-card__header {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-6);
  background: linear-gradient(
    135deg,
    rgba(136, 19, 55, 0.04) 0%,
    rgba(180, 83, 9, 0.03) 100%
  );
  border-bottom: 1px solid var(--color-border-subtle);
}

.project-card__icon-bg {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background-color: var(--color-accent-dim);
  border: 1px solid rgba(136, 19, 55, 0.2);
  border-radius: var(--radius-lg);
}

.project-card__icon {
  width: 22px;
  height: 22px;
  color: var(--color-accent);
}

.project-card__badge {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  background-color: rgba(72, 79, 88, 0.1);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  padding: var(--space-1) var(--space-3);
}

.project-card__badge--private {
  color: var(--color-accent-2);
  background-color: rgba(180, 83, 9, 0.08);
  border-color: rgba(180, 83, 9, 0.3);
}

.project-card__body {
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.project-card__title {
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--color-text-secondary);
  letter-spacing: -0.01em;
}

.project-card__description {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.65;
}

.project-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  padding-top: var(--space-2);
}

.project-card__tag {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-text-muted);
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 2px var(--space-3);
  letter-spacing: 0.04em;
}

.contact__content {
  max-width: 640px;
  margin-inline: auto;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-10);
}

.contact__message {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  line-height: 1.75;
}

.contact__links {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  width: 100%;
}

.contact__link {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-6);
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  text-decoration: none;
  transition:
    background-color var(--transition-base),
    border-color var(--transition-base),
    transform var(--transition-base),
    box-shadow var(--transition-base);
}

.contact__link:hover {
  background-color: var(--color-bg-card-hover);
  border-color: rgba(136, 19, 55, 0.4);
  transform: translateX(4px);
  box-shadow: var(--shadow-md);
}

.contact__link-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background-color: var(--color-accent-dim);
  border: 1px solid rgba(136, 19, 55, 0.2);
  border-radius: var(--radius-md);
  flex-shrink: 0;
  color: var(--color-accent);
  transition: background-color var(--transition-fast);
}

.contact__link:hover .contact__link-icon {
  background-color: rgba(136, 19, 55, 0.15);
}

.contact__link-icon svg {
  width: 18px;
  height: 18px;
}

.contact__link-text {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

.contact__link:hover .contact__link-text {
  color: var(--color-text-primary);
}

.footer {
  background-color: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-8);
}

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.footer__copy {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.footer__name {
  color: var(--color-text-secondary);
  font-weight: 500;
}

.footer__credit {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
}

@media (min-width: 640px) {
  .projects__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .contact__links {
    flex-direction: column;
    max-width: 480px;
    width: 100%;
  }
}

@media (min-width: 900px) {
  .section {
    padding-block: var(--space-32);
  }

  .projects__grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .skills__groups {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-12) var(--space-16);
  }
}

@media (max-width: 768px) {
  .nav__hamburger {
    display: flex;
  }

  .nav__links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    background-color: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-4);
    gap: var(--space-1);
    opacity: 0;
    pointer-events: none;
    transform: translateY(-8px);
    transition:
      opacity var(--transition-base),
      transform var(--transition-base);
  }

  .nav__links.is-open {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }

  .nav__link {
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-md);
    text-align: left;
  }

  .nav__link--cta {
    margin-top: var(--space-2);
    text-align: center;
    justify-content: center;
  }

  .about__skills-grid {
    grid-template-columns: 1fr;
  }

  .hero__scroll-indicator {
    display: none;
  }

  .contact__links {
    width: 100%;
  }
}

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

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .hero__content,
  .hero__eyebrow,
  .hero__name,
  .hero__tagline,
  .hero__bio,
  .hero__actions,
  .hero__scroll-indicator {
    animation: none;
    opacity: 1;
    transform: none;
  }

  .hero__scroll-line {
    animation: none;
  }

  .btn,
  .skills__tag,
  .project-card,
  .contact__link,
  .nav__logo {
    transition: none;
  }
}