/* ---------- Base / Theme ---------- */
:root {
  --bg: #0e0f1a;
  --bg-alt: #14162447;
  --panel: #171929;
  --panel-2: #1e2136;
  --border: #2a2d45;
  --text: #e8e9f3;
  --text-dim: #a3a6c2;
  --accent: #7c5cff;
  --accent-2: #22d3ee;
  --accent-3: #ff5c8a;
  --warn: #ffb020;
  --good: #34d399;
  --radius: 14px;
  --max-width: 1120px;
  --font: "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(124, 92, 255, 0.18), transparent 60%),
    radial-gradient(900px 500px at 0% 10%, rgba(34, 211, 238, 0.10), transparent 55%),
    var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }

a { color: var(--accent-2); text-decoration: none; }
a:hover { text-decoration: underline; }

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* ---------- Header / Nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(14, 15, 26, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  max-width: var(--max-width);
  margin: 0 auto;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.15rem;
  color: var(--text);
  letter-spacing: 0.2px;
}
.brand:hover { text-decoration: none; }

.brand-mark {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  display: grid;
  place-items: center;
  font-size: 1.1rem;
  box-shadow: 0 4px 18px rgba(124, 92, 255, 0.45);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 22px;
}

.nav-links a {
  color: var(--text-dim);
  font-weight: 600;
  font-size: 0.95rem;
}
.nav-links a:hover { color: var(--text); text-decoration: none; }
.nav-links a.active { color: var(--accent-2); }

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  padding: 8px 10px;
  cursor: pointer;
  font-size: 1.1rem;
}

@media (max-width: 780px) {
  .nav-toggle { display: inline-flex; }
  .nav-links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--panel);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 8px 0;
    display: none;
  }
  .nav-links.open { display: flex; }
  .nav-links a {
    width: 100%;
    padding: 12px 20px;
    border-bottom: 1px solid var(--border);
  }
}

/* ---------- Hero ---------- */
.hero {
  padding: 72px 0 56px;
  text-align: center;
}

.eyebrow {
  display: inline-block;
  padding: 6px 14px;
  border-radius: 999px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--accent-2);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.4px;
  text-transform: uppercase;
  margin-bottom: 20px;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.4rem);
  margin: 0 0 18px;
  line-height: 1.15;
  font-weight: 800;
}

.hero h1 span {
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero p {
  max-width: 640px;
  margin: 0 auto 30px;
  color: var(--text-dim);
  font-size: 1.08rem;
}

.hero-actions {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  padding: 13px 24px;
  border-radius: 10px;
  font-weight: 700;
  font-size: 0.95rem;
  border: 1px solid transparent;
  cursor: pointer;
}
.btn:hover { text-decoration: none; }

.btn-primary {
  background: linear-gradient(90deg, var(--accent), #9b7bff);
  color: #fff;
  box-shadow: 0 8px 24px rgba(124, 92, 255, 0.35);
}
.btn-primary:hover { filter: brightness(1.08); }

.btn-secondary {
  background: var(--panel-2);
  color: var(--text);
  border-color: var(--border);
}
.btn-secondary:hover { background: #262a45; }

/* ---------- Sections ---------- */
section { padding: 56px 0; }

.section-head {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 40px;
}

.section-head h2 {
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  margin: 0 0 12px;
}

.section-head p { color: var(--text-dim); margin: 0; }

.tag {
  color: var(--accent-2);
  font-weight: 700;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* ---------- Cards ---------- */
.grid {
  display: grid;
  gap: 20px;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
  transition: transform 0.15s ease, border-color 0.15s ease;
}

.card:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
}

.card-icon {
  width: 46px;
  height: 46px;
  border-radius: 10px;
  background: var(--panel-2);
  display: grid;
  place-items: center;
  font-size: 1.4rem;
  margin-bottom: 16px;
}

.card h3 { margin: 0 0 10px; font-size: 1.15rem; }
.card p { margin: 0 0 16px; color: var(--text-dim); font-size: 0.95rem; }

.card-link {
  font-weight: 700;
  font-size: 0.88rem;
}

.difficulty {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 3px 9px;
  border-radius: 999px;
  margin-bottom: 14px;
  letter-spacing: 0.3px;
  text-transform: uppercase;
}
.difficulty.beginner { background: rgba(52, 211, 153, 0.15); color: var(--good); }
.difficulty.intermediate { background: rgba(255, 176, 32, 0.15); color: var(--warn); }
.difficulty.core { background: rgba(124, 92, 255, 0.18); color: #b8a4ff; }

/* ---------- Steps / How it works ---------- */
.steps {
  display: grid;
  gap: 20px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.step {
  position: relative;
  padding: 24px 20px 20px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.step-num {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: 800;
  margin-bottom: 14px;
}

/* ---------- Callouts ---------- */
.callout {
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  background: var(--panel);
  border-radius: 10px;
  padding: 18px 20px;
  margin: 24px 0;
}
.callout.tip { border-left-color: var(--good); }
.callout.warn { border-left-color: var(--warn); }
.callout strong { display: block; margin-bottom: 6px; }

/* ---------- Guide layout ---------- */
.guide-hero {
  padding: 48px 0 30px;
  border-bottom: 1px solid var(--border);
}

.breadcrumb {
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-bottom: 16px;
}
.breadcrumb a { color: var(--text-dim); }
.breadcrumb a:hover { color: var(--accent-2); }

.guide-hero h1 { font-size: clamp(1.8rem, 4vw, 2.6rem); margin: 0 0 12px; }
.guide-meta { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; color: var(--text-dim); font-size: 0.9rem; }

.guide-body {
  max-width: 760px;
  margin: 0 auto;
  padding: 40px 20px 20px;
}

.guide-body h2 {
  font-size: 1.5rem;
  margin: 40px 0 14px;
  padding-top: 6px;
}
.guide-body h2:first-child { margin-top: 0; }

.guide-body h3 {
  font-size: 1.15rem;
  margin: 26px 0 10px;
  color: var(--accent-2);
}

.guide-body p, .guide-body li { color: #d7d8e8; }
.guide-body ul, .guide-body ol { padding-left: 22px; }
.guide-body li { margin-bottom: 8px; }

.guide-body code {
  background: var(--panel-2);
  border: 1px solid var(--border);
  padding: 2px 7px;
  border-radius: 5px;
  font-size: 0.88em;
}

.table-wrap { overflow-x: auto; margin: 20px 0; }
table {
  width: 100%;
  border-collapse: collapse;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
}
th, td {
  text-align: left;
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
  font-size: 0.92rem;
}
th { background: var(--panel-2); color: var(--text); }
td { color: var(--text-dim); }
tr:last-child td { border-bottom: none; }

.next-guide {
  margin-top: 48px;
  padding: 22px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.next-guide .label { color: var(--text-dim); font-size: 0.82rem; text-transform: uppercase; letter-spacing: 0.4px; margin-bottom: 4px; }
.next-guide .title { font-weight: 700; font-size: 1.05rem; }

/* ---------- Glossary ---------- */
.glossary-list dt {
  font-weight: 800;
  color: var(--text);
  margin-top: 22px;
  font-size: 1.05rem;
}
.glossary-list dd {
  margin: 6px 0 0;
  color: var(--text-dim);
}

.az-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 24px 0 8px;
}
.az-jump a {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 11px;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-dim);
}
.az-jump a:hover { color: var(--accent-2); text-decoration: none; border-color: var(--accent); }

/* ---------- CTA ---------- */
.cta {
  text-align: center;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 56px 24px;
  margin: 0 auto;
}
.cta h2 { margin: 0 0 12px; font-size: clamp(1.4rem, 3vw, 2rem); }
.cta p { color: var(--text-dim); margin: 0 0 26px; }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  margin-top: 60px;
  padding: 36px 0;
  color: var(--text-dim);
  font-size: 0.88rem;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 14px;
}
.footer-links { display: flex; gap: 18px; flex-wrap: wrap; }
.footer-links a { color: var(--text-dim); }
.footer-links a:hover { color: var(--accent-2); }
.footer-disclaimer {
  margin-top: 18px;
  font-size: 0.78rem;
  color: #6d708f;
  line-height: 1.5;
}

/* ---------- Utility ---------- */
.text-center { text-align: center; }
.mt-0 { margin-top: 0; }