/* Base theme */
:root {
  --bg: #f8fafc;
  --text: #0f172a;
  --muted: #64748b;
  --primary: #2563eb;
  --primary-contrast: #ffffff;
  --border: #e2e8f0;
  --card-bg: #ffffff;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.07);
  --shadow-lg: 0 10px 15px rgba(0,0,0,0.1);
  --transition-fast: 0.15s ease-in-out;
  --transition-medium: 0.3s ease-in-out;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1220;
    --text: #e6e8ee;
    --muted: #9aa4b2;
    --primary: #3b82f6;
    --primary-contrast: #0b1220;
    --border: #1f2937;
    --card-bg: #0f172a;
  }
}

/* User theme override via attribute (wins over prefers-color-scheme) */
:root[data-theme="light"] {
  --bg: #f8fafc;
  --text: #0f172a;
  --muted: #64748b;
  --primary: #2563eb;
  --primary-contrast: #ffffff;
  --border: #e2e8f0;
  --card-bg: #ffffff;
}

:root[data-theme="dark"] {
  --bg: #0b1220;
  --text: #e6e8ee;
  --muted: #9aa4b2;
  --primary: #3b82f6;
  --primary-contrast: #0b1220;
  --border: #1f2937;
  --card-bg: #0f172a;
}

/* Smooth theme transition */
html, body {
  transition: background-color 0.2s ease, color 0.2s ease;
}

/* Reset + base */
*,
*::before,
*::after { 
  box-sizing: border-box; 
}

html { 
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

img, svg, video, canvas { 
  display: block; 
  max-width: 100%; 
  height: auto;
}

a { 
  color: var(--primary); 
  text-decoration: none;
  transition: var(--transition-fast);
}
a:hover, a:focus { 
  text-decoration: underline;
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

/* Skip link for accessibility */
.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--primary);
  color: var(--primary-contrast);
  padding: 8px;
  z-index: 1000;
  text-decoration: none;
  border-radius: 4px;
  transition: top var(--transition-fast);
}
.skip-link:focus {
  top: 6px;
}

/* Accessibility utility */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* Layout helpers - Mobile First */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem;
}

@media (min-width: 48em) { /* 768px */
  .container {
    padding: 1.5rem;
  }
}

@media (min-width: 64em) { /* 1024px */
  .container {
    padding: 2rem;
  }
}

/* Header */
header {
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 100;
}

header .container {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: center;
  padding: 1rem;
}

@media (min-width: 48em) {
  header .container {
    flex-direction: row;
    justify-content: space-between;
    gap: 2rem;
  }
}

.brand {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
  transition: var(--transition-fast);
}

.brand:hover, .brand:focus {
  color: var(--primary);
  text-decoration: none;
}

/* Navigation */
nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
}

@media (min-width: 48em) {
  nav ul {
    gap: 1.5rem;
    justify-content: flex-end;
  }
}

nav a {
  padding: 0.5rem 1rem;
  border-radius: 8px;
  transition: var(--transition-fast);
  display: block;
}

nav a:hover, nav a:focus {
  background: color-mix(in srgb, var(--primary) 10%, transparent);
  text-decoration: none;
}

/* Main content */
main {
  flex: 1;
}

/* Sections */
section {
  padding: 2rem 0;
}

@media (min-width: 48em) {
  section {
    padding: 3rem 0;
  }
}

@media (min-width: 64em) {
  section {
    padding: 4rem 0;
  }
}

/* Hero section */
#hero {
  background: linear-gradient(135deg, var(--card-bg) 0%, color-mix(in srgb, var(--primary) 5%, var(--card-bg)) 100%);
  text-align: center;
  padding: 3rem 0;
}

@media (min-width: 48em) {
  #hero {
    padding: 5rem 0;
  }
}

#hero h1 {
  font-size: 2.5rem;
  font-weight: 800;
  margin: 0 0 0.5rem 0;
  background: linear-gradient(135deg, var(--text), var(--primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

@media (min-width: 48em) {
  #hero h1 {
    font-size: 3.5rem;
  }
}

#hero p {
  font-size: 1.25rem;
  color: var(--muted);
  margin: 0 0 2rem 0;
}

#hero figure {
  /* keep the figure width cap so the image size is consistent */
  max-width: 200px;
  margin: 2rem auto 0;
}

#hero img {
  border-radius: 50%;
  box-shadow: var(--shadow-lg);
  transition: transform var(--transition-medium);
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  object-position: center;
}

#hero img:hover {
  transform: scale(1.05);
}

#hero figcaption {
  margin-top: 1rem;
  color: var(--muted);
  font-style: italic;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  line-height: 1.3;
  margin: 0 0 1rem 0;
  font-weight: 600;
}

h2 {
  font-size: 2rem;
  margin-bottom: 2rem;
  border-bottom: 2px solid var(--border);
  padding-bottom: 0.5rem;
}

@media (min-width: 48em) {
  h2 {
    font-size: 2.5rem;
  }
}

h3 {
  font-size: 1.5rem;
  color: var(--primary);
  margin-bottom: 0.5rem;
}

/* Technical Skills layout refinement */
#skills .container { display: block; } /* override previous grid */
.skills-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}
@media (min-width: 600px) {
  .skills-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 900px) {
  .skills-grid { grid-template-columns: repeat(3, 1fr); }
}

/* Skills section - Grid layout */
#skills .container {
  display: grid;
  gap: 2rem;
  grid-template-columns: 1fr;
}

@media (min-width: 48em) {
  #skills .container {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 64em) {
  #skills .container {
    grid-template-columns: repeat(3, 1fr);
  }
}

#skills article {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-medium), box-shadow var(--transition-medium);
}

#skills article:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

#skills ul {
  list-style: none;
  padding: 0;
  margin: 1rem 0 0 0;
}

#skills li {
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--border);
  transition: var(--transition-fast);
}

#skills li:last-child {
  border-bottom: none;
}

#skills li:hover {
  color: var(--primary);
  padding-left: 0.5rem;
}

/* Experience and Projects sections */
#experience article,
#projects article {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2rem;
  margin-bottom: 2rem;
  box-shadow: var(--shadow-sm);
  transition: var(--transition-medium);
}

#experience article:hover,
#projects article:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
}

#experience header,
#projects header {
  margin-bottom: 1rem;
}

#experience time,
#projects p {
  color: var(--muted);
  font-size: 0.95rem;
}

/* Experience org logos */
.exp-header {
  display: flex;
  align-items: center;
  gap: 1rem;
}
.exp-header .org-logo {
  width: 48px;
  height: 48px;
  border-radius: 8px;
  object-fit: cover;
}
@media (max-width: 480px) {
  .exp-header .org-logo {
    width: 40px;
    height: 40px;
  }
}

/* Get In Touch layout refinement */
#contact .container { display: block; } /* override previous flex */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}
@media (min-width: 900px) {
  .contact-grid {
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }
}

/* Contact section - Flexbox layout */
#contact .container {
  display: flex;
  flex-direction: column;
  gap: 3rem;
}

@media (min-width: 64em) {
  #contact .container {
    flex-direction: row;
    gap: 4rem;
  }
  
  #contact article {
    flex: 1;
  }
}

#contact address {
  font-style: normal;
  line-height: 1.8;
}

#contact nav ul {
  list-style: none;
  padding: 0;
  margin: 1rem 0 0 0;
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

/* Form row for name/email */
.form-row {
  display: grid;
  gap: 1rem;
}
@media (min-width: 600px) {
  .form-row { grid-template-columns: 1fr 1fr; }
}

/* Keep the form readable on large screens */
#contact form { max-width: 640px; }

/* Forms */
form {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

label {
  display: block;
  font-weight: 500;
  margin-bottom: 0.5rem;
  color: var(--text);
}

input[type="text"],
input[type="email"],
textarea {
  width: 100%;
  padding: 0.75rem;
  border: 2px solid var(--border);
  border-radius: 8px;
  background: var(--card-bg);
  color: var(--text);
  font-size: 1rem;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

input:focus,
textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary) 20%, transparent);
}

textarea {
  resize: vertical;
  min-height: 120px;
}

/* Buttons */
button,
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border: 2px solid var(--primary);
  border-radius: 8px;
  background: var(--primary);
  color: var(--primary-contrast);
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition-fast);
  text-decoration: none;
}

button:hover,
.btn:hover,
button:focus,
.btn:focus {
  background: color-mix(in srgb, var(--primary) 90%, black);
  border-color: color-mix(in srgb, var(--primary) 90%, black);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  text-decoration: none;
}

button:active,
.btn:active {
  transform: translateY(0);
}

/* Footer */
footer {
  background: var(--card-bg);
  border-top: 1px solid var(--border);
  margin-top: auto;
  padding: 2rem 0;
}

footer .container {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: center;
  text-align: center;
}

@media (min-width: 48em) {
  footer .container {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

footer p {
  margin: 0;
  color: var(--muted);
}

/* Loading animation for images */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

img {
  animation: fadeIn var(--transition-medium) ease-out;
}

/* Focus management for accessibility */
:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

/* Reduced motion preference */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* Print styles */
@media print {
  header nav,
  #contact form,
  footer a {
    display: none;
  }
  
  body {
    font-size: 12pt;
    line-height: 1.4;
  }
  
  section {
    page-break-inside: avoid;
  }
}

/* Minimal overrides to simplify layouts */
section#skills > .container { display: block !important; } /* disable complex grid here */
section#contact > .container { 
  display: block !important;   /* disable flex/grid */
  text-align: center; 
}

/* Technical Skills: compact label/value rows */
.skills-list {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: .25rem .75rem;
  margin: 0;
}
.skills-list dt {
  font-weight: 700;
}
.skills-list dd {
  margin: 0;
}

/* Optional: stack labels above values on very small screens */
@media (max-width: 480px) {
  .skills-list { grid-template-columns: 1fr; }
}

/* Ensure Get In Touch stays centered */
section#contact > .container { text-align: center; }
#contact article { margin-inline: auto; max-width: 720px; }
#contact form { align-items: center; margin-inline: auto; }
#contact form > * { width: 100%; max-width: 520px; margin-inline: auto; }
.social-links { justify-content: center; }
#contact address { margin: 0 auto; }
  .skills-table thead,
  .skills-table tbody,
  .skills-table tr,
  .skills-table th,
  .skills-table td { display: block; }
  .skills-table th { border-bottom: none; }
  .skills-table td { border-top: none; }


/* Get In Touch: center everything */
.contact-grid { display: block !important; } /* single column */
#contact article { margin-inline: auto; max-width: 720px; }
#contact form { 
  align-items: center; 
  margin-inline: auto; 
}
#contact form > * { width: 100%; max-width: 520px; margin-inline: auto; }
.social-links { justify-content: center; }
#contact address { margin: 0 auto; }