:root {
  --bg: #ffffff;
  --bg-elev: #f0f8ff;
  --sidebar-bg: #02577a;
  --text: #01303f;
  --muted: #02577a;
  --accent: #02a9f7;
  --accent-hover: #0288d1;
  --border: #b8d4f0;
  --shadow: 0 2px 4px rgba(2, 87, 122, 0.1);
  --shadow-hover: 0 4px 12px rgba(2, 87, 122, 0.2);
  
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  
  --radius: 8px;
  --radius-lg: 12px;
  
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  
  --sidebar-width: 280px;
  --header-height: 60px;
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #01303f;
    --bg-elev: #02577a;
    --sidebar-bg: #02577a;
    --text: #d4f0fc;
    --muted: #89d6fb;
    --accent: #02a9f7;
    --accent-hover: #0288d1;
    --border: #02577a;
    --shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    --shadow-hover: 0 4px 12px rgba(0, 0, 0, 0.4);
  }
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--text);
  background-color: var(--bg);
  overflow-x: hidden;
}

.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--accent);
  color: white;
  padding: var(--space-sm) var(--space-md);
  text-decoration: none;
  border-radius: var(--radius);
  z-index: 1000;
  transition: top 0.3s;
}

.skip-link:focus {
  top: 6px;
}

/* Layout Grid */
body {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  grid-template-areas: "sidebar main";
  min-height: 100vh;
}

/* Sidebar */
.sidebar {
  grid-area: sidebar;
  background: var(--sidebar-bg);
  border-right: 1px solid var(--border);
  padding: var(--space-xl);
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

.sidebar__header {
  margin-bottom: var(--space-2xl);
}

.sidebar__name {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  margin-bottom: var(--space-xs);
  color: #d4f0fc;
}

.sidebar__image {
  display: flex;
  justify-content: center;
  margin: var(--space-md) 0 var(--space-lg) 0;
}

.sidebar__headshot {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  object-fit: cover;
  aspect-ratio: 1;
  border: 3px solid #d4f0fc;
  box-shadow: var(--shadow-lg);
  margin: 0 auto;
}

.sidebar__title {
  color: #89d6fb;
  font-size: var(--font-size-sm);
}

.sidebar__nav {
  flex: 1;
}

.nav-list {
  list-style: none;
}

.nav-list__item {
  margin-bottom: var(--space-sm);
}

.nav-list__link {
  display: block;
  padding: var(--space-sm) var(--space-md);
  color: #89d6fb;
  text-decoration: none;
  border-radius: var(--radius);
  transition: all 0.2s ease;
  position: relative;
}

.nav-list__link:hover,
.nav-list__link:focus {
  color: #d4f0fc;
  background-color: rgba(212, 240, 252, 0.1);
  outline: none;
}

.nav-list__link[aria-current="page"] {
  color: #d4f0fc;
  background-color: rgba(212, 240, 252, 0.2);
  font-weight: 600;
}

.nav-list__link[aria-current="page"]::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 20px;
  background-color: #d4f0fc;
  border-radius: 0 2px 2px 0;
}

.sidebar__footer {
  margin-top: auto;
  padding-top: var(--space-xl);
}

.sidebar__resume {
  margin-bottom: var(--space-lg);
}

.social-links {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--space-md);
}

.social-links__link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  color: #89d6fb;
  border-radius: 50%;
  transition: all 0.2s ease;
}

.social-links__link:hover,
.social-links__link:focus {
  color: #d4f0fc;
  background-color: rgba(212, 240, 252, 0.1);
  outline: none;
}

.social-links__icon {
  width: 20px;
  height: 20px;
}

/* Mobile Header */
.mobile-header {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background-color: var(--bg);
  border-bottom: 1px solid var(--border);
  z-index: 100;
  padding: 0 var(--space-md);
}

.mobile-header__content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: 1200px;
  margin: 0 auto;
}

.mobile-header__name {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--text);
}

/* Hamburger Menu */
.hamburger {
  display: flex;
  flex-direction: column;
  justify-content: space-around;
  width: 24px;
  height: 24px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}

.hamburger__line {
  width: 100%;
  height: 2px;
  background-color: var(--text);
  transition: all 0.3s ease;
  transform-origin: center;
}

.hamburger[aria-expanded="true"] .hamburger__line:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.hamburger[aria-expanded="true"] .hamburger__line:nth-child(2) {
  opacity: 0;
}

.hamburger[aria-expanded="true"] .hamburger__line:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -6px);
}

/* Mobile Overlay */
.mobile-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 50;
}

.mobile-overlay.active {
  display: block;
}

/* Main Content */
.main {
  grid-area: main;
}

/* Container */
.container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

/* Sections */
.section {
  margin-bottom: var(--space-3xl);
  scroll-margin-top: var(--space-xl);
}

.section__title {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  margin-bottom: var(--space-2xl);
  color: var(--text);
  position: relative;
}

.section__title::after {
  content: '';
  position: absolute;
  bottom: -var(--space-sm);
  left: 0;
  width: 60px;
  height: 3px;
  background-color: var(--accent);
  border-radius: 2px;
}

/* About Hero Section */
.section--hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: var(--space-3xl) 0;
  /* background: linear-gradient(135deg, var(--bg) 0%, var(--bg-elev) 100%); */
}

.about-hero {
  max-width: 1200px;
  margin: 0 auto;
}

.about-hero__content {
  display: flex;
  justify-content: center;
  align-items: center;
}

.about-hero__text {
  text-align: center;
  max-width: 800px;
}


.about-hero__title {
  font-size: clamp(3rem, 8vw, 5rem);
  font-weight: 700;
  color: var(--text);
  margin-bottom: var(--space-lg);
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.about-hero__location {
  font-size: var(--font-size-lg);
  color: var(--muted);
  margin-bottom: var(--space-xl);
  font-weight: 400;
}

.about-hero__location a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-color: transparent;
  transition: text-decoration-color 0.3s ease;
}

.about-hero__location a:hover {
  text-decoration-color: var(--accent);
}

.about-hero__description {
  font-size: var(--font-size-xl);
  color: var(--text);
  margin-bottom: var(--space-2xl);
  line-height: 1.5;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.about-hero__social {
  display: flex;
  justify-content: center;
  gap: var(--space-lg);
  margin-bottom: var(--space-2xl);
}

.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 50px;
  height: 50px;
  background-color: var(--bg-elev);
  border: 2px solid var(--border);
  border-radius: 50%;
  color: var(--text);
  text-decoration: none;
  transition: all 0.3s ease;
}

.social-link:hover {
  background-color: var(--accent);
  color: white;
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.social-link svg {
  width: 24px;
  height: 24px;
}

.about-hero__actions {
  display: flex;
  justify-content: center;
  gap: var(--space-lg);
  flex-wrap: wrap;
}

.btn--outline {
  background-color: transparent;
  color: var(--text);
  border: 2px solid var(--accent);
  padding: var(--space-md) var(--space-xl);
  font-size: var(--font-size-base);
  font-weight: 600;
  border-radius: var(--radius-md);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
  min-width: 180px;
}

.btn--outline:hover {
  background-color: var(--accent);
  color: white;
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}


/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-sm) var(--space-lg);
  font-size: var(--font-size-base);
  font-weight: 600;
  text-decoration: none;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 0.2s ease;
  min-height: 44px;
}

.btn--primary {
  background-color: var(--accent);
  color: white;
}

.btn--primary:hover,
.btn--primary:focus {
  background-color: var(--accent-hover);
  outline: none;
  box-shadow: var(--shadow-hover);
}

.btn--full {
  width: 100%;
}

.btn--sidebar {
  width: 100%;
  background-color: #d4f0fc;
  color: #01303f;
  border: 2px solid #b8d4f0;
  font-weight: 700;
}

.btn--sidebar:hover,
.btn--sidebar:focus {
  background-color: #89d6fb;
  color: #01303f;
  border-color: #02a9f7;
  outline: none;
  box-shadow: var(--shadow-hover);
}

/* Experience & Education Lists */
.experience-list,
.education-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

.experience-item,
.education-item {
  background-color: var(--bg-elev);
  padding: var(--space-xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  transition: box-shadow 0.2s ease;
}

.experience-item:hover,
.education-item:hover {
  box-shadow: var(--shadow-hover);
}

.experience-item__header,
.education-item__header {
  margin-bottom: var(--space-md);
}

.experience-item__title,
.education-item__title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  margin-bottom: var(--space-xs);
  color: var(--text);
}

.experience-item__company,
.education-item__institution {
  color: var(--accent);
  font-weight: 600;
  margin-bottom: var(--space-xs);
}

.experience-item__meta,
.education-item__meta {
  color: var(--muted);
  font-size: var(--font-size-sm);
}

.experience-item__bullets {
  list-style: none;
  margin-top: var(--space-md);
}

.experience-item__bullet {
  position: relative;
  padding-left: var(--space-lg);
  margin-bottom: var(--space-sm);
  color: var(--muted);
}

.experience-item__bullet::before {
  content: '•';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: bold;
}

/* Projects Grid */
.projects-grid {
  display: flex;
  flex-direction: column;
  gap: var(--space-2xl);
}

.project-card {
  background-color: var(--bg-elev);
  padding: var(--space-xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  transition: all 0.2s ease;
  position: relative;
  display: flex;
  flex-direction: column;
  height: 100%;
}

.project-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}

.project-card__header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--space-md);
  gap: var(--space-md);
}

.project-card__title-section {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  flex: 1;
}

.project-card__title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--text);
  margin: 0;
}

.project-card__dates {
  color: var(--muted);
  font-size: var(--font-size-sm);
  font-weight: 600;
  white-space: nowrap;
}

.project-card__summary {
  color: var(--muted);
  margin-bottom: var(--space-lg);
  line-height: 1.6;
}

.project-card__stack-section {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  gap: var(--space-lg);
  margin-bottom: var(--space-lg);
}

.project-card__stack {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  flex: 1;
}

.stack-badge {
  display: inline-block;
  padding: var(--space-xs) var(--space-sm);
  background-color: var(--accent);
  color: #ffffff;
  font-size: var(--font-size-sm);
  font-weight: 600;
  border-radius: var(--radius);
}

.project-card__toggle {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
  transition: color 0.2s ease;
  background: none;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: var(--font-size-base);
  padding: 0;
}

.project-card__toggle:hover,
.project-card__toggle:focus {
  color: var(--accent-hover);
  outline: none;
}

.toggle-icon {
  transition: transform 0.2s ease;
  font-size: 0.8em;
}

.project-card__bullets {
  list-style: none;
  margin: var(--space-md) 0;
}

.project-card__bullet {
  position: relative;
  padding-left: var(--space-lg);
  margin-bottom: var(--space-sm);
  color: var(--muted);
  line-height: 1.5;
}

.project-card__bullet::before {
  content: '•';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: bold;
}

.project-card__links {
  display: flex;
  gap: var(--space-md);
  align-items: center;
  flex-shrink: 0;
}

.project-card__link {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
  transition: color 0.2s ease;
}

.project-card__link:hover,
.project-card__link:focus {
  color: var(--accent-hover);
  outline: none;
}

/* Skills */
.skills {
  display: flex;
  flex-direction: column;
  gap: var(--space-2xl);
}

.skills-group {
  background-color: var(--bg-elev);
  padding: var(--space-xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}

.skills-group__title {
  font-size: var(--font-size-lg);
  font-weight: 700;
  margin-bottom: var(--space-lg);
  color: var(--text);
}

.skills-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.skill-chip {
  display: inline-block;
  padding: var(--space-sm) var(--space-md);
  background-color: var(--accent);
  color: #ffffff;
  font-size: var(--font-size-sm);
  font-weight: 600;
  border-radius: var(--radius);
  transition: all 0.2s ease;
}

.skill-chip:hover {
  background-color: var(--accent-hover);
  transform: translateY(-1px);
}

/* Contact Form */
.contact__intro {
  margin-bottom: var(--space-2xl);
  text-align: center;
}

.contact__intro p {
  font-size: var(--font-size-lg);
  color: var(--muted);
}


.contact-form {
  max-width: 600px;
  margin: 0 auto;
}

.form-group {
  margin-bottom: var(--space-lg);
}

.form-label {
  display: block;
  margin-bottom: var(--space-sm);
  font-weight: 600;
  color: var(--text);
}

.form-input,
.form-textarea {
  width: 100%;
  padding: var(--space-md);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  font-size: var(--font-size-base);
  font-family: inherit;
  background-color: var(--bg);
  color: var(--text);
  transition: border-color 0.2s ease;
}

.form-input:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(2, 169, 247, 0.1);
}

.form-input:invalid:not(:focus):not(:placeholder-shown),
.form-textarea:invalid:not(:focus):not(:placeholder-shown) {
  border-color: #02a9f7;
}

.form-error {
  margin-top: var(--space-sm);
  color: #e74c3c;
  font-size: var(--font-size-sm);
  min-height: 1.2em;
}

/* Back to Top Button */
.back-to-top {
  position: fixed;
  bottom: var(--space-xl);
  right: var(--space-xl);
  width: 50px;
  height: 50px;
  background-color: var(--accent);
  color: white;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  z-index: 100;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover,
.back-to-top:focus {
  background-color: var(--accent-hover);
  outline: none;
  transform: translateY(-2px);
}

.back-to-top svg {
  width: 24px;
  height: 24px;
}

/* Footer */
.footer {
  background-color: var(--bg-elev);
  border-top: 1px solid var(--border);
  padding: var(--space-xl) 0;
  text-align: center;
  color: var(--muted);
  font-size: var(--font-size-sm);
}

/* Responsive Design */
@media (max-width: 1023px) {
  body {
    grid-template-columns: 1fr;
    grid-template-areas: "main";
  }
  
  .sidebar {
    position: fixed;
    top: 0;
    left: -100%;
    width: var(--sidebar-width);
    height: 100vh;
    z-index: 200;
    transition: left 0.3s ease;
  }
  
  .sidebar.open {
    left: 0;
  }
  
  .mobile-header {
    display: block;
  }
  
  .main {
    padding-top: 0;
  }
  
  .about-hero__content {
    grid-template-columns: 1fr;
    text-align: center;
    gap: var(--space-2xl);
  }
  
  .about-hero__text {
    text-align: center;
  }
  
  .about-hero__title {
    font-size: clamp(2.5rem, 6vw, 4rem);
  }
  
  .about-hero__actions {
    flex-direction: column;
    align-items: center;
  }
  
  .btn--outline {
    width: 100%;
    max-width: 280px;
  }
}

@media (max-width: 768px) {
  .container {
    padding: 0 var(--space-md);
  }
  
  .section {
    margin-bottom: var(--space-2xl);
  }
  
  .section__title {
    font-size: var(--font-size-2xl);
  }
  
  .projects-grid {
    flex-direction: column;
  }
  
  .project-card__header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-xs);
  }
  
  .project-card__title-section {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-sm);
  }
  
  .project-card__dates {
    white-space: normal;
  }
  
  .project-card__stack-section {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-md);
  }
  
  .project-card__links {
    justify-content: flex-start;
  }
  
  .skills {
    flex-direction: column;
  }
  
  .back-to-top {
    bottom: var(--space-md);
    right: var(--space-md);
  }
}

@media (max-width: 480px) {
  :root {
    --sidebar-width: 100%;
  }
  
  .sidebar {
    width: 100%;
  }
  
  .experience-item,
  .education-item,
  .project-card,
  .skills-group {
    padding: var(--space-lg);
  }
  
  .contact-form {
    padding: 0;
  }
}
@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;
  }
}

*:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

button:focus,
a:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

@media (prefers-contrast: high) {
  :root {
    --border: #000000;
    --shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
  }
}