:root {
  --bg: #0b0f14;
  --panel: #121821;
  --border: #1f2733;
  --text: #e6e9ee;
  --text-dim: #9aa5b1;
  --accent: #8be04e;
  --accent-dim: #4f7a2f;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --font-mono: "SF Mono", "Menlo", "Consolas", monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.55;
}

body {
  -webkit-user-select: none;
  -moz-user-select: none;
  user-select: none;
}

input, textarea, [contenteditable] {
  -webkit-user-select: text;
  -moz-user-select: text;
  user-select: text;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* --- Landing page --- */

.landing {
  max-width: 880px;
  margin: 0 auto;
  padding: 6rem 1.5rem 4rem;
}

.landing-header { margin-bottom: 3rem; }

.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.landing-header h1 {
  font-size: 2.4rem;
  margin: 0 0 1rem;
  line-height: 1.15;
}

.lede {
  color: var(--text-dim);
  font-size: 1.05rem;
  max-width: 640px;
}

.callout {
  max-width: 640px;
  margin-top: 1.25rem;
  padding: 0.85rem 1.1rem;
  background: var(--panel);
  border: 1px solid var(--accent-dim);
  border-radius: 8px;
  font-size: 0.95rem;
  color: var(--text);
}

.callout-cta {
  display: inline-block;
  margin-top: 1rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--bg);
  background: var(--accent);
  border-radius: 999px;
  padding: 0.5rem 1.1rem;
}

.callout-cta:hover {
  background: var(--accent-dim);
  color: var(--text);
  text-decoration: none;
}

.callout-note {
  margin-top: 0.75rem;
  font-size: 0.85rem;
  color: var(--text-dim);
}

.callout-note p { margin: 0 0 0.4rem; }

.callout-note ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.callout-note li { padding: 0.15rem 0; }

.challenge-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
  margin-bottom: 3rem;
}

.card {
  display: block;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  color: var(--text);
  transition: border-color 0.15s ease, transform 0.15s ease;
}

.card:hover {
  border-color: var(--accent-dim);
  transform: translateY(-2px);
  text-decoration: none;
}

.card-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid var(--accent-dim);
  border-radius: 999px;
  padding: 0.2rem 0.6rem;
  margin-bottom: 0.75rem;
}

.card h2 { margin: 0 0 0.5rem; font-size: 1.3rem; }
.card p { color: var(--text-dim); margin: 0 0 1rem; font-size: 0.95rem; }
.card-cta { font-family: var(--font-mono); font-size: 0.85rem; color: var(--accent); }

.landing-footer { color: var(--text-dim); font-size: 0.9rem; }

/* --- Challenge spec page --- */

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 880px;
  margin: 0 auto;
  padding: 1.5rem 1.5rem 0;
}

.site-header .brand {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.site-header .docs-link {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  border: 1px solid var(--accent-dim);
  border-radius: 999px;
  padding: 0.35rem 0.9rem;
}

.markdown-body {
  max-width: 880px;
  margin: 0 auto;
  padding: 2rem 1.5rem 1rem;
}

.markdown-body h1 { font-size: 2rem; margin-top: 0; }
.markdown-body h2 {
  font-size: 1.4rem;
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}
.markdown-body h3 { font-size: 1.1rem; margin-top: 1.75rem; }
.markdown-body p, .markdown-body li { color: var(--text); }
.markdown-body ul, .markdown-body ol { color: var(--text-dim); }
.markdown-body strong { color: var(--text); }

.markdown-body code {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.1rem 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.85em;
}

.markdown-body pre {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem;
  overflow-x: auto;
}
.markdown-body pre code { background: none; border: none; padding: 0; }

/* Design exports embedded in the challenge specs. Width is capped by the
   container, and never upscaled past the export's own resolution. */
.markdown-body img {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 1.5rem 0;
  border: 1px solid var(--border, #2a3140);
  border-radius: 8px;
}

.markdown-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  font-size: 0.92rem;
}
.markdown-body th, .markdown-body td {
  border: 1px solid var(--border);
  padding: 0.5rem 0.75rem;
  text-align: left;
}
.markdown-body th { color: var(--accent); background: var(--panel); }

.markdown-body blockquote {
  border-left: 3px solid var(--accent-dim);
  margin: 1rem 0;
  padding: 0.25rem 1rem;
  color: var(--text-dim);
}

.markdown-body hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2.5rem 0;
}

/* --- Apply page --- */

.apply-form {
  display: flex;
  gap: 0.75rem;
  align-items: flex-end;
  flex-wrap: wrap;
  margin: 1.5rem 0;
}

.apply-form label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-bottom: 0.4rem;
}

.apply-form input {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-size: 0.95rem;
  padding: 0.55rem 0.75rem;
  min-width: 220px;
}

.apply-form input:focus {
  outline: none;
  border-color: var(--accent-dim);
}

.apply-form button {
  background: var(--accent);
  border: none;
  border-radius: 6px;
  color: var(--bg);
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 600;
  padding: 0.6rem 1rem;
}

.apply-form button:hover { background: var(--accent-dim); color: var(--text); }

.apply-result {
  border-radius: 8px;
  padding: 0.75rem 1rem;
  font-size: 0.95rem;
}

.apply-result-success {
  background: var(--panel);
  border: 1px solid var(--accent-dim);
  color: var(--text);
}

.apply-result-error {
  background: var(--panel);
  border: 1px solid #7a2f2f;
  color: var(--text);
}

/* --- Resources section --- */

.resources {
  max-width: 880px;
  margin: 0 auto;
  padding: 1rem 1.5rem 4rem;
}

.resources h2 {
  font-size: 1.2rem;
  color: var(--accent);
  border-top: 1px solid var(--border);
  padding-top: 2rem;
}

.resources ul {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 0.5rem 1.5rem;
}

.resources li {
  border-bottom: 1px solid var(--border);
  padding: 0.5rem 0;
}