:root {
  --background: #050b14;
  --background-soft: #081321;
  --panel: rgba(15, 30, 49, 0.82);
  --panel-solid: #0d1b2d;
  --panel-light: #12253c;
  --border: rgba(137, 172, 210, 0.18);
  --text: #f4f8fc;
  --muted: #9cb0c6;
  --primary: #34d5c5;
  --primary-strong: #0fb5a7;
  --blue: #4e9cff;
  --success: #55e39a;
  --danger: #ff6b6b;
  --shadow: 0 30px 90px rgba(0, 0, 0, 0.36);
  --radius: 16px;
  --max-width: 980px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 75% 5%, rgba(49, 119, 183, 0.16), transparent 34rem),
    radial-gradient(circle at 15% 18%, rgba(43, 205, 190, 0.09), transparent 30rem),
    var(--background);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
}

a { color: inherit; text-decoration: none; }

.wrap { max-width: var(--max-width); margin: 0 auto; padding: 0 1.5rem; }

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border);
}

.brand { display: flex; align-items: center; gap: 0.6rem; font-size: 1rem; }
.brand strong { display: block; font-size: 1.05rem; }
.brand small { display: block; color: var(--muted); font-size: 0.72rem; letter-spacing: 0.04em; }
.brand-mark { width: 28px; height: 28px; }

.site-nav { display: flex; align-items: center; gap: 1.4rem; font-size: 0.9rem; color: var(--muted); }
.site-nav a:hover { color: var(--text); }
.site-nav .nav-cta {
  color: #04211e;
  background: var(--primary);
  padding: 0.5rem 1rem;
  border-radius: 999px;
  font-weight: 600;
}
.site-nav .nav-cta:hover { background: var(--primary-strong); color: #04211e; }

main { max-width: var(--max-width); margin: 0 auto; padding: 2.5rem 1.5rem 5rem; }

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.72rem;
  color: var(--primary);
  font-weight: 600;
  margin: 0 0 0.5rem;
}

h1 { font-size: 2rem; text-wrap: balance; margin: 0 0 0.75rem; }
h2 { font-size: 1.4rem; margin: 2rem 0 0.75rem; }
h3 { font-size: 1.1rem; margin: 1.5rem 0 0.5rem; }
p { color: var(--muted); }

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  box-shadow: var(--shadow);
}

.panel + .panel { margin-top: 1.25rem; }

.button {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.65rem 1.3rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.92rem;
  border: 1px solid transparent;
  cursor: pointer;
}
.button-primary { background: var(--primary); color: #04211e; }
.button-primary:hover { background: var(--primary-strong); }
.button-secondary { background: transparent; border-color: var(--border); color: var(--text); }
.button-secondary:hover { border-color: var(--primary); }
.button:disabled { opacity: 0.5; cursor: not-allowed; }

form { display: flex; flex-direction: column; gap: 1rem; max-width: 420px; }
label { font-size: 0.85rem; color: var(--muted); display: flex; flex-direction: column; gap: 0.35rem; }
input[type="text"], input[type="email"], input[type="password"] {
  background: var(--panel-solid);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.65rem 0.8rem;
  color: var(--text);
  font-size: 0.95rem;
}
input:focus { outline: 2px solid var(--primary); outline-offset: 1px; }

.alert {
  border-radius: 10px;
  padding: 0.75rem 1rem;
  font-size: 0.88rem;
  border: 1px solid var(--border);
}
.alert-error { background: rgba(255, 107, 107, 0.1); border-color: rgba(255, 107, 107, 0.4); color: #ffb3b3; }
.alert-success { background: rgba(85, 227, 154, 0.1); border-color: rgba(85, 227, 154, 0.4); color: var(--success); }

.module-list { display: flex; flex-direction: column; gap: 1rem; }
.module-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
}
.module-row h3 { margin: 0 0 0.25rem; }
.module-row p { margin: 0; font-size: 0.88rem; }
.pill {
  font-size: 0.72rem;
  padding: 0.25rem 0.65rem;
  border-radius: 999px;
  background: var(--panel-light);
  color: var(--muted);
  white-space: nowrap;
}
.pill-done { background: rgba(85, 227, 154, 0.15); color: var(--success); }
.pill-locked { background: rgba(156, 176, 198, 0.12); color: var(--muted); }

.lesson-list { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 0.5rem; }
.lesson-list li a {
  display: flex;
  justify-content: space-between;
  padding: 0.85rem 1rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--panel-solid);
}
.lesson-list li a:hover { border-color: var(--primary); }

.prose h1, .prose h2, .prose h3 { color: var(--text); }
.prose p, .prose li { color: #d3dfec; }
.prose code {
  background: var(--panel-solid);
  padding: 0.1rem 0.4rem;
  border-radius: 6px;
  font-size: 0.85em;
}
.prose pre {
  background: var(--panel-solid);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem;
  overflow-x: auto;
}
.prose pre code { background: none; padding: 0; }
.prose ul { padding-left: 1.3rem; }

.quiz-question { margin-bottom: 1.75rem; }
.quiz-question p.q { color: var(--text); font-weight: 600; margin-bottom: 0.6rem; }
.quiz-choice { display: flex; gap: 0.6rem; align-items: flex-start; padding: 0.4rem 0; color: #d3dfec; font-size: 0.92rem; }

table { width: 100%; border-collapse: collapse; font-size: 0.88rem; }
th, td { text-align: left; padding: 0.6rem 0.5rem; border-bottom: 1px solid var(--border); color: var(--muted); }
th { color: var(--text); font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.05em; }

.site-footer {
  border-top: 1px solid var(--border);
  padding: 2rem 1.5rem;
  text-align: center;
  color: var(--muted);
  font-size: 0.82rem;
}

.certificate {
  background: linear-gradient(160deg, #0d1b2d, #081321);
  border: 1px solid rgba(52, 213, 197, 0.35);
  border-radius: 20px;
  padding: 3rem;
  text-align: center;
}
.certificate .eyebrow { justify-content: center; }
.certificate h1 { font-size: 1.8rem; }
.certificate .name { font-size: 2.2rem; margin: 1rem 0; color: var(--primary); }
.certificate .meta { color: var(--muted); font-size: 0.85rem; margin-top: 2rem; }

@media print {
  .site-header, .site-footer, .no-print { display: none; }
  body { background: #fff; color: #000; }
  .certificate { border: 2px solid #0fb5a7; background: #fff; color: #000; }
  .certificate .name { color: #0fb5a7; }
}

@media (max-width: 640px) {
  .site-nav { display: none; }
  .module-row { flex-direction: column; align-items: flex-start; }
}