/* GitHub ribbon */
.github-ribbon {
  position: fixed;
  top: 0;
  right: 0;
  width: 12rem;
  height: 12rem;
  overflow: hidden;
  z-index: 1050;
  pointer-events: none;
}

.github-ribbon a {
  position: absolute;
  top: 2.75rem;
  right: -3.25rem;
  display: block;
  width: 14rem;
  padding: 0.4rem 0;
  background-color: var(--primary-strong, #1f5d46);
  color: #fff;
  font-size: 0.78rem;
  font-weight: 600;
  text-align: center;
  text-decoration: none;
  letter-spacing: 0.03em;
  transform: rotate(45deg);
  pointer-events: auto;
  box-shadow: 0 2px 6px rgba(0,0,0,0.25);
  transition: background-color 0.2s;
}

.github-ribbon a:hover,
.github-ribbon a:focus {
  background-color: var(--primary, #2f7a5f);
  outline: 3px solid var(--accent, #f2b84b);
  outline-offset: 2px;
}

:root {
  --bg: #f6fbf8;
  --surface: #ffffff;
  --surface-muted: #e8f4ee;
  --text: #163027;
  --text-muted: #406156;
  --primary: #2f7a5f;
  --primary-strong: #1f5d46;
  --accent: #f2b84b;
  --border: #cfe3d9;
  --radius: 1rem;
  --shadow-soft: 0 16px 32px rgba(22, 48, 39, 0.08);
}

* {
  box-sizing: border-box;
}

html:focus-within {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Source Sans 3", "Trebuchet MS", sans-serif;
  line-height: 1.65;
  color: var(--text);
  background:
    radial-gradient(1000px 500px at 10% -10%, rgba(242, 184, 75, 0.25), transparent 60%),
    radial-gradient(1000px 500px at 95% -20%, rgba(47, 122, 95, 0.2), transparent 60%),
    var(--bg);
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: "Fraunces", Georgia, serif;
  color: var(--text);
}

.skip-link {
  position: absolute;
  left: 0.5rem;
  top: -3rem;
  z-index: 1000;
  background: var(--surface);
  color: var(--text);
  padding: 0.5rem 0.75rem;
  border-radius: 0.5rem;
  border: 1px solid var(--border);
}

.skip-link:focus {
  top: 0.5rem;
}

.eyebrow {
  color: var(--primary-strong);
  letter-spacing: 0.04em;
  font-weight: 700;
  text-transform: uppercase;
  font-size: 0.8rem;
}

.hero {
  background: linear-gradient(120deg, rgba(232, 244, 238, 0.95), rgba(255, 255, 255, 0.95));
}

.status-chip {
  display: inline-flex;
  align-items: center;
  padding: 0.5rem 0.9rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  font-weight: 600;
  color: var(--text-muted);
}

.section-nav {
  background: rgba(246, 251, 248, 0.92);
  backdrop-filter: blur(8px);
}

.card-soft {
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
  box-shadow: var(--shadow-soft);
  animation: fade-up 280ms ease both;
}

@keyframes fade-up {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.btn-primary {
  background-color: var(--primary);
  border-color: var(--primary);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background-color: var(--primary-strong);
  border-color: var(--primary-strong);
}

.btn-outline-primary {
  color: var(--primary-strong);
  border-color: var(--primary);
}

.btn-outline-primary:hover,
.btn-outline-primary.active,
.btn-outline-primary:focus-visible {
  background-color: var(--primary);
  border-color: var(--primary);
}

.reveal-box {
  border-left: 4px solid var(--accent);
  background: var(--surface-muted);
  padding: 0.75rem 1rem;
  border-radius: 0.6rem;
}

.callout {
  border: 1px solid var(--border);
  background: linear-gradient(120deg, rgba(232, 244, 238, 0.92), rgba(255, 255, 255, 0.95));
  border-radius: 0.8rem;
  padding: 0.85rem 1rem;
}

.flip-card {
  border: 1px solid var(--border);
  border-radius: 0.8rem;
  background: var(--surface-muted);
  color: var(--text);
  min-height: 120px;
  padding: 1rem;
  text-align: left;
  transition: transform 160ms ease, background-color 160ms ease;
}

.flip-card:hover,
.flip-card:focus-visible {
  transform: translateY(-2px);
}

.flip-card .flip-back {
  display: none;
}

.flip-card.is-flipped {
  background: var(--surface);
}

.flip-card.is-flipped .flip-front {
  display: none;
}

.flip-card.is-flipped .flip-back {
  display: inline;
}

.result-box {
  border: 1px solid var(--border);
  border-radius: 0.8rem;
  background: var(--surface-muted);
  padding: 1rem;
}

.result-box.pass {
  border-color: #1d7a46;
}

.result-box.fail {
  border-color: #a53a3a;
}

.form-select.is-invalid,
.form-check-input.is-invalid {
  border-color: #b03737;
}

:focus-visible {
  outline: 3px solid #0b5ed7;
  outline-offset: 2px;
}

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