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

html,
body {
  margin: 0;
  padding: 0;
}

/* Color system */
:root {
  color-scheme: light dark;

  --bg: #ffffff;
  --text: #222222;
  --muted: #666666;
  --border: #dddddd;
  --link: #2a4cb2;
  --link-hover: #1f3a8a;
}

/* Use system preference as default */
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #050608;
    --text: #e5e7eb;
    --muted: #9ca3af;
    --border: #2d2d2d;
    --link: #93c5fd;
    --link-hover: #bfdbfe;
  }
}

/* Fluid, comfortable text size */
html {
  font-size: clamp(14px, 2.5vw, 20px);
}

body {
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  font-family: "Montserrat", sans-serif;
  font-weight: 400;
}

/* Main column on the left */
main,
.site-header {
  max-width: 35rem;
  margin-left: 1.5rem;
  margin-right: auto;
}

/* More breathing room on large screens */
@media (min-width: 900px) {
  main,
  .site-header {
    margin-left: 8vw;
  }
}

/* Header title */
.site-title {
  font-size: 6rem;
  margin: 6rem 0 1rem 0;

  font-family: "Great Vibes", cursive;
  font-weight: 400;
}

/* Sections */
.section {
  margin: 2rem 0;
}

/* Link styling */
a {
  color: var(--link);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition:
    color 0.2s ease,
    border-color 0.2s ease;
  letter-spacing: 0.2px;
}

a:hover,
a:focus {
  color: var(--link-hover);
  border-bottom-color: var(--link-hover);
}

/* Mobile heading tweak */
@media (max-width: 600px) {
  .site-title {
    font-size: 3.5rem;
    margin-top: 3rem;
  }
}

/* Manual theme overrides via data-theme */
body[data-theme="light"] {
  --bg: #ffffff;
  --text: #222222;
  --muted: #666666;
  --border: #dddddd;
  --link: #2a4cb2;
  --link-hover: #1f3a8a;
}

body[data-theme="dark"] {
  --bg: #050608;
  --text: #e5e7eb;
  --muted: #9ca3af;
  --border: #2d2d2d;
  --link: #93c5fd;
  --link-hover: #bfdbfe;
}

/* Global top-right toggle button */
.theme-toggle {
  position: fixed;
  top: 1rem;
  right: 1rem;

  border: none;
  background: transparent;
  color: var(--text);
  cursor: pointer;
  font-size: 1.6rem; /* sun/moon icon size */
  padding: 0.25rem;
  line-height: 1;
  display: flex;
  align-items: center;

  opacity: 0.8;
  transition:
    opacity 0.2s ease,
    color 0.2s ease;
}

.theme-toggle:hover,
.theme-toggle:focus {
  opacity: 0.55;
}