/*
 *  Base: reset, variables, typography, layout.
 */

*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg:           #f4efe8;
  --surface:      #faf7f3;
  --text:         #2c2825;
  --muted:        #8a8278;
  --accent:       #3d7068;
  --accent-hover: #2a544d;
  --border:       #e5ded5;
  --note-bg:      #fdfbf7;
  --radius:       4px;
}

html {
  font-size: 18px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background: var(--bg);
}

body {
  font-family: "Fraunces", Georgia, "Times New Roman", serif;
  font-weight: 400;
  font-optical-sizing: auto;
  color: var(--text);
  line-height: 1.65;
  min-height: 100vh;
}

main {
  max-width: 600px;
  margin: 0 auto;
  padding: 5rem 1.5rem 3rem;
  position: relative;
}

section {
  margin-bottom: 4rem;
}

/* Links */
a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

/* Section labels */
.section-label {
  font-size: 0.8rem;
  color: var(--muted);
  font-style: italic;
  margin-bottom: 1rem;
}

.section-intro {
  color: var(--muted);
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
}

/* Tab panels */
.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
}

/* Focus */
a:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition-duration: 0s !important;
    animation-duration: 0s !important;
  }
}

/* Mobile */
@media (max-width: 900px) {
  .margin-note {
    display: none;
  }
}

@media (max-width: 520px) {
  main {
    padding: 3.5rem 1.25rem 2rem;
    max-width: 100%;
  }

  .hero h1 {
    font-size: 2.6rem;
  }

  .hero .subtitle {
    font-size: 0.95rem;
  }

  .achieve-header {
    flex-direction: column;
    gap: 0.15rem;
  }

  .achieve-sponsor {
    text-align: left;
  }

  .links {
    flex-direction: column;
    gap: 0.5rem;
  }
}