:root {
  /* Theme Colors */
  --color-background: #10231c;
  --color-background-dark: #0b1914;
  --color-surface: #1a332a;
  --color-surface-2: #244238;
  --color-text: #eaf7f0;
  --color-heading: #b9f2c8;
  --color-link: #7fd9b3;
  --color-hover: #a4ebcd;
  --color-accent: #23bfa0;

  /* UI Tokens */
  --color-border-soft: rgba(185, 242, 200, 0.24);
  --color-border-strong: rgba(185, 242, 200, 0.4);
  --color-cert-card: #dff5ea;
  --color-cert-card-hover: #cdefde;
  --color-cert-embed-bg: #eaf8f1;
  --color-cert-card-border: #b7d8c8;
  --shadow-card-hover: 0 8px 18px rgba(0, 0, 0, 0.22);
  --shadow-cert-hover: 0 8px 18px rgba(0, 0, 0, 0.14);

  /* Spacing & Typography */
  --section-gap: 30px;
  --font-body: "Inter", sans-serif;
  --font-heading: "Montserrat", sans-serif;
}

/* Base */
html,
body {
  height: 100%;
  margin: 0;
  padding: 0;
  font-family: var(--font-body);
  background: var(--color-background);
  color: var(--color-text);
  line-height: 1.6;
  font-size: 1rem;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Body layout */
body {
  display: flex;
  flex-direction: column;
}

/* Headings */
h1,
h2,
h3 {
  font-family: var(--font-heading);
  color: var(--color-heading);
  margin-bottom: 0.5em;
}

h1 {
  font-size: 2.5rem;
}
h2 {
  font-size: 2rem;
}
h3 {
  font-size: 1.5rem;
}

main {
  flex: 1;
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 24px 32px;
  box-sizing: border-box;
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  padding: 20px 32px;
  background: var(--color-background-dark);
  color: var(--color-text);
  font-size: 18px;
}

nav a {
  color: var(--color-link);
  text-decoration: none;
}

section {
  padding-left: 0;
  padding-right: 0;
  padding-top: 0;
  padding-bottom: var(--section-gap);
}

#hero,
#about-me,
#this-site {
  background: var(--color-background);
}

p {
  margin-bottom: 1.25em;
}

/* Links */
a {
  color: var(--color-link);
  text-decoration: underline;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--color-hover);
}

a:focus {
  outline: 2px solid var(--color-hover);
  outline-offset: 2px;
}

a:focus-visible {
  outline: 2px solid var(--color-hover);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }
}

@media (max-width: 1000px) {
  main,
  section {
    padding: 0;
  }

  main {
    padding: 16px;
  }

  h1 {
    font-size: 2.1rem;
  }

  h2 {
    font-size: 1.7rem;
  }

  h3 {
    font-size: 1.25rem;
  }

  nav {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    padding: 16px;
  }
}