/* === Self-hosted Noto Sans (EU-compliant, no external requests) === */
@font-face {
  font-family: 'Noto Sans';
  src: url('../fonts/NotoSans-Regular.ttf') format('truetype');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'Noto Sans';
  src: url('../fonts/NotoSans-Bold.ttf') format('truetype');
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'Noto Sans';
  src: url('../fonts/NotoSans-Italic.ttf') format('truetype');
  font-weight: 400;
  font-style: italic;
  font-display: swap;
}
@font-face {
  font-family: 'Noto Sans';
  src: url('../fonts/NotoSans-BoldItalic.ttf') format('truetype');
  font-weight: 700;
  font-style: italic;
  font-display: swap;
}

/* === kumarathurai.eu — Design Tokens === */
:root {
  --color-primary: #3d4f22;
  --color-primary-light: #556b2f;
  --color-accent: #8a9a5b;
  --color-accent-soft: #c2cca8;
  --color-bg: #fafaf6;
  --color-bg-alt: #f0eeea;
  --color-surface: #ffffff;
  --color-text: #2a2a2a;
  --color-text-muted: #5a5a5a;
  --color-text-inverse: #fafaf6;
  --color-border: #ddd8cf;
  --font-body: 'Noto Sans', system-ui, -apple-system, sans-serif;
  --font-display: Georgia, 'Times New Roman', serif;
  --max-width: 1100px;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 3rem;
  --spacing-xl: 5rem;
  --radius: 6px;
  --transition: 0.2s ease;
}

/* === Reset & Base === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  font-size: 100%;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--color-primary); text-decoration: underline; text-underline-offset: 3px; transition: color var(--transition); }
a:hover, a:focus { color: var(--color-primary-light); }
a:focus-visible { outline: 3px solid var(--color-accent); outline-offset: 3px; border-radius: 2px; }

/* === Skip Link (accessibility) === */
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  background: var(--color-primary);
  color: var(--color-text-inverse);
  padding: 0.75rem 1.5rem;
  z-index: 1000;
  border-radius: var(--radius);
  text-decoration: none;
  font-weight: 600;
}
.skip-link:focus { top: 1rem; }

/* === Header & Navigation === */
.site-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.75rem var(--spacing-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-sm);
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--color-primary);
  font-weight: 700;
  font-size: 1.1rem;
}

.site-logo img {
  height: 40px;
  width: auto;
}

/* Hamburger menu */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  color: var(--color-primary);
}

.nav-toggle svg { width: 28px; height: 28px; }

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

.site-nav ul {
  list-style: none;
  display: flex;
  gap: var(--spacing-md);
  align-items: center;
}

.site-nav a {
  text-decoration: none;
  color: var(--color-text);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 0.25rem 0;
  border-bottom: 2px solid transparent;
  transition: border-color var(--transition), color var(--transition);
}

.site-nav a:hover,
.site-nav a:focus { color: var(--color-primary); border-bottom-color: var(--color-primary); }
.site-nav a[aria-current="page"] { color: var(--color-primary); border-bottom-color: var(--color-accent); }

/* Mobile nav */
@media (max-width: 768px) {
  .nav-toggle { display: block; }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    display: none;
    padding: var(--spacing-sm) var(--spacing-md);
  }

  .site-nav.open { display: block; }

  .site-nav ul {
    flex-direction: column;
    gap: 0;
  }

  .site-nav a {
    display: block;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--color-border);
  }

  .site-nav li:last-child a { border-bottom: none; }
}

/* === Hero Section === */
.hero {
  background: var(--color-primary);
  color: var(--color-text-inverse);
  padding: var(--spacing-xl) var(--spacing-md);
}

.hero-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
  align-items: center;
}

.hero-eyebrow {
  font-size: 0.9rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-accent-soft);
  margin-bottom: var(--spacing-xs);
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 2.8rem);
  line-height: 1.2;
  margin-bottom: var(--spacing-sm);
  font-weight: 700;
}

.hero-subtitle {
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-accent-soft);
  margin-bottom: var(--spacing-sm);
}

.hero-text {
  font-size: 1.05rem;
  line-height: 1.7;
  margin-bottom: var(--spacing-md);
  max-width: 55ch;
}

.hero-photo {
  border-radius: var(--radius);
  width: 100%;
  max-width: 420px;
  justify-self: center;
  box-shadow: 0 8px 30px rgba(0,0,0,0.25);
}

@media (max-width: 768px) {
  .hero-inner {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .hero-photo {
    max-width: 280px;
    margin: 0 auto;
    order: -1;
  }
  .hero-text { max-width: none; }
}

/* === Buttons === */
.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  transition: background var(--transition), transform var(--transition);
  cursor: pointer;
  border: none;
}

.btn:hover { transform: translateY(-1px); }
.btn:focus-visible { outline: 3px solid var(--color-accent); outline-offset: 3px; }

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

.btn-outline {
  background: transparent;
  border: 2px solid var(--color-accent-soft);
  color: var(--color-text-inverse);
}
.btn-outline:hover { background: rgba(255,255,255,0.1); color: var(--color-text-inverse); }

/* === Page Content Sections === */
.page-section {
  padding: var(--spacing-xl) var(--spacing-md);
}

.page-section:nth-child(even) {
  background: var(--color-bg-alt);
}

.section-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.section-inner h2 {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  color: var(--color-primary);
  margin-bottom: var(--spacing-md);
  line-height: 1.3;
}

.section-inner h3 {
  font-size: 1.2rem;
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
}

.section-inner p {
  max-width: 70ch;
  margin-bottom: var(--spacing-sm);
}

.section-inner p:last-child { margin-bottom: 0; }

/* === Page Hero (for sub-pages) === */
.page-hero {
  background: var(--color-primary);
  color: var(--color-text-inverse);
  padding: var(--spacing-lg) var(--spacing-md);
  text-align: center;
}

.page-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  margin-bottom: var(--spacing-xs);
}

.page-hero p {
  color: var(--color-accent-soft);
  font-size: 1.05rem;
  max-width: 60ch;
  margin: 0 auto;
}

/* === Achievement Cards === */
.achievement-grid {
  display: grid;
  gap: var(--spacing-md);
}

.achievement-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  display: grid;
  grid-template-columns: 300px 1fr;
  align-items: start;
}

.achievement-card img {
  width: 100%;
  height: auto;
  object-fit: contain;
}

.achievement-card .card-body {
  padding: var(--spacing-md);
}

.achievement-card h3 {
  margin-bottom: 0.25rem;
}

.achievement-role {
  font-weight: 600;
  color: var(--color-accent);
  font-size: 0.9rem;
  margin-bottom: var(--spacing-sm);
}

.achievement-card .card-links {
  margin-top: var(--spacing-sm);
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.achievement-card .card-links a {
  font-size: 0.9rem;
}

@media (max-width: 768px) {
  .achievement-card {
    grid-template-columns: 1fr;
  }
  .achievement-card img {
    height: 180px;
  }
}

/* === Project Cards === */
.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--spacing-md);
}

.project-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--spacing-md);
  transition: box-shadow var(--transition);
}

.project-card:hover {
  box-shadow: 0 4px 16px rgba(0,0,0,0.08);
}

.project-card h3 {
  margin-bottom: var(--spacing-xs);
}

.project-card h3 a {
  text-decoration: none;
  color: var(--color-primary);
}
.project-card h3 a:hover { text-decoration: underline; }

.project-card p {
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

/* === Social Links === */
.social-links {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
  align-items: center;
}

.social-links a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-primary);
  color: var(--color-text-inverse);
  text-decoration: none;
  transition: background var(--transition), transform var(--transition);
}

.social-links a:hover {
  background: var(--color-primary-light);
  transform: translateY(-2px);
}

.social-links a:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 3px;
}

.social-links svg { width: 20px; height: 20px; fill: currentColor; }

/* === Travel Map === */
.map-embed {
  width: 100%;
  height: 450px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  margin-top: var(--spacing-sm);
}

@media (max-width: 768px) {
  .map-embed { height: 300px; }
}

/* === Contact Section === */
.contact-info {
  font-size: 1.1rem;
}

.contact-email {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--color-primary);
}

/* === Footer === */
.site-footer {
  background: var(--color-primary);
  color: var(--color-accent-soft);
  padding: var(--spacing-md) var(--spacing-md);
  text-align: center;
  font-size: 0.9rem;
}

.site-footer a { color: var(--color-accent-soft); }
.site-footer a:hover { color: var(--color-text-inverse); }

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  align-items: center;
}

.footer-social { margin-top: var(--spacing-xs); }
.footer-social a { background: rgba(255,255,255,0.12); }
.footer-social a:hover { background: rgba(255,255,255,0.25); }

/* === Interests List === */
.interests-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
  margin-top: var(--spacing-sm);
}

.interests-list li {
  background: var(--color-accent-soft);
  color: var(--color-primary);
  padding: 0.35rem 0.85rem;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 500;
}

/* === 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;
}

.text-center { text-align: center; }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }