:root {
  --bg: #f6f8fa;
  --accent: #2563eb;
  --accent-hover: #3b82f6;
  --text: #1f2937;
  --light-text: #4b5563;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

body {
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

/* ─── Language Switcher ────────────────────────────────── */
#lang-switcher {
  position: fixed;
  top: 1rem;
  left: 1rem;
  display: flex;
  align-items: center;
  gap: 0.25rem;
  z-index: 999;
  user-select: none;
}

#lang-toggle {
  border: none;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  padding: 0.35rem 0.85rem;
  border-radius: 999px;
  cursor: pointer;
  font-size: 0.9rem;
  opacity: 0.95;
  transition: background-color 0.35s ease,
              transform 0.55s cubic-bezier(0.68,-0.55,0.27,1.55),
              opacity 0.35s ease;
}

#lang-toggle:hover {
  background: var(--accent-hover);
  transform: scale(1.08) translateY(-1px);
  opacity: 1;
}

#lang-toggle:active { transform: scale(0.95); }
#lang-toggle.toggled { transform: rotateY(360deg); }

/* ─── Layout Basics ───────────────────────────────────── */
header {
  padding: 4rem 1rem 2rem;
  text-align: center;
  background: #ffffff;
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

header h1 { font-size: 2.25rem; margin-bottom: 0.5rem; }
header p { font-size: 1.05rem; color: var(--light-text); max-width: 600px; margin: auto; }

nav { margin-top: 1.5rem; }
nav a {
  margin: 0 0.75rem;
  text-decoration: none;
  color: var(--text);
  font-weight: 500;
  transition: color 0.2s;
}

nav a:hover { color: var(--accent); }
nav a.active { border-bottom: 2px solid var(--accent); padding-bottom: 0.25rem; }

section {
  padding: 4rem 1rem;
  max-width: 960px;
  margin: auto;
}

/* ─── Hero ─────────────────────────────────────────────── */
#hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.profile-pic {
  width: 180px;
  height: 180px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--accent);
  margin-bottom: 1.5rem;
}

#hero h2 {
  font-size: 1.9rem;
  margin-bottom: 1rem;
  color: var(--accent);
}

#hero p {
  max-width: 640px;
  font-size: 1.05rem;
  margin-bottom: 2rem;
}

.cta {
  background: var(--accent);
  border: none;
  color: #fff;
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  border-radius: 0.5rem;
  cursor: pointer;
  box-shadow: 0 2px 6px rgba(37,99,235,0.3);
  transition: transform 0.25s, background-color 0.25s;
}

.cta:hover {
  transform: translateY(-2px);
  background: var(--accent-hover);
}

/* ─── Card Grid ────────────────────────────────────────── */
.card-grid {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  margin-top: 2rem;
}

.card {
  background: #ffffff;
  padding: 1.5rem;
  border-radius: 0.75rem;
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.card h3 { margin-bottom: 0.5rem; color: var(--accent); }
.card p  { color: var(--light-text); }

/* ─── Footer ───────────────────────────────────────────── */
footer {
  background: #ffffff;
  text-align: center;
  padding: 2rem 1rem;
  margin-top: 4rem;
  font-size: 0.9rem;
  color: var(--light-text);
}

footer a { color: var(--accent); }

/* ─── Dark Mode ────────────────────────────────────────── */
@media (prefers-color-scheme: dark) {
  :root { --bg: #0f172a; --text: #f8fafc; --light-text: #94a3b8; }
  header, footer, .card { background: #1e293b; }
  nav a:hover { color: #3b82f6; }
  .cta { box-shadow: 0 2px 6px rgba(59,130,246,0.3); }
}

/* ─── Responsive Tweaks ───────────────────────────────── */
@media (max-width: 480px) {
  header h1 { font-size: 1.8rem; }
  #hero h2 { font-size: 1.5rem; }
  .profile-pic { width: 140px; height: 140px; }
  nav a { margin: 0 0.35rem; }
}