/* ── Reset & Variables ─────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:        #0d1117;
  --bg-card:   #161b22;
  --bg-hover:  #1c2128;
  --border:    #30363d;
  --border-hl: #3776ab;
  --py-blue:   #3776ab;
  --py-yellow: #ffd43b;
  --text:      #e6edf3;
  --muted:     #8b949e;
  --radius:    10px;
  --gap:       1.5rem;
}

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
  line-height: 1.6;
  min-height: 100vh;
}

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

/* ── Layout helpers ────────────────────────────────────────── */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

section { padding: 4rem 0; }
section + section { border-top: 1px solid var(--border); }

h2 {
  font-size: 1.6rem;
  margin-bottom: 0.4rem;
  color: var(--text);
}

.section-sub {
  color: var(--muted);
  margin-bottom: 2rem;
  font-size: 0.95rem;
}

/* ── Hero ──────────────────────────────────────────────────── */
.hero {
  padding: 5rem 0 4rem;
  text-align: center;
  background: radial-gradient(ellipse 80% 50% at 50% -10%, rgba(55,118,171,0.18), transparent);
  border-bottom: 1px solid var(--border);
}

.hero-logo {
  width: 80px;
  height: 80px;
  margin: 0 auto 1.5rem;
  display: block;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--text) 40%, var(--py-blue));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-tagline {
  color: var(--muted);
  font-size: 1.1rem;
  margin: 0.75rem auto 2rem;
  max-width: 540px;
}

.badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
  margin-bottom: 2.5rem;
}

.badge {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.3rem 0.9rem;
  font-size: 0.8rem;
  color: var(--muted);
}

.badge span { color: var(--py-yellow); font-weight: 600; }

.cta-group {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.65rem 1.4rem;
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-weight: 500;
  transition: opacity 0.15s, transform 0.15s;
  cursor: pointer;
}
.btn:hover { opacity: 0.85; transform: translateY(-1px); text-decoration: none; }

.btn-primary {
  background: var(--py-blue);
  color: #fff;
  border: none;
}

.btn-secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

/* ── Cards grid ────────────────────────────────────────────── */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--gap);
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.4rem 1.5rem;
  transition: border-color 0.2s, background 0.2s, transform 0.15s;
  display: flex;
  flex-direction: column;
}

.card:hover {
  border-color: var(--border-hl);
  background: var(--bg-hover);
  transform: translateY(-2px);
}

.card-icon {
  font-size: 1.8rem;
  margin-bottom: 0.75rem;
  display: block;
}

.card h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
}

.card p {
  color: var(--muted);
  font-size: 0.875rem;
  line-height: 1.5;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-top: 0.9rem;
  flex-grow: 1;
  align-content: flex-start;
}

.card-footer {
  margin-top: 1.1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

.btn-card {
  display: block;
  width: 100%;
  text-align: center;
  padding: 0.5rem 1rem;
  border-radius: var(--radius);
  border: 1px solid var(--border-hl);
  color: var(--py-blue);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  transition: background 0.15s, color 0.15s, transform 0.15s;
}

.btn-card:hover {
  background: var(--py-blue);
  color: #fff;
  text-decoration: none;
  transform: translateY(-1px);
}

.tag {
  background: rgba(55,118,171,0.12);
  color: #79aacc;
  border-radius: 4px;
  padding: 0.15rem 0.5rem;
  font-size: 0.75rem;
}

.card-level {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.15rem 0.55rem;
  border-radius: 4px;
  margin-bottom: 0.65rem;
}

.level-beginner    { background: rgba(63,185,80,0.15);  color: #3fb950; }
.level-intermediate{ background: rgba(210,153,34,0.15); color: #d2991f; }
.level-advanced    { background: rgba(248,81,73,0.15);  color: #f85149; }
.level-data        { background: rgba(130,80,255,0.15); color: #9a6bff; }
.level-web         { background: rgba(56,182,255,0.15); color: #38b6ff; }
.level-auto        { background: rgba(255,166,0,0.15);  color: #ffa600; }

/* ── Resource cards ────────────────────────────────────────── */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--gap);
}

.resource-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.4rem;
  transition: border-color 0.2s, transform 0.15s;
}

.resource-card:hover {
  border-color: var(--border-hl);
  transform: translateY(-2px);
}

.resource-card h3 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 0.35rem;
}

.resource-card p {
  color: var(--muted);
  font-size: 0.85rem;
}

.resource-list {
  list-style: none;
  margin-top: 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.resource-list li::before {
  content: '→ ';
  color: var(--py-blue);
  font-size: 0.8rem;
}

.resource-list li {
  font-size: 0.83rem;
  color: var(--muted);
}

/* ── Stats bar ─────────────────────────────────────────────── */
.stats {
  display: flex;
  flex-wrap: wrap;
  gap: 2rem;
  padding: 2.5rem 0;
  justify-content: center;
}

.stat { text-align: center; }

.stat-value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--py-yellow);
  display: block;
  line-height: 1;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--muted);
  margin-top: 0.3rem;
}

/* ── Footer ────────────────────────────────────────────────── */
footer {
  border-top: 1px solid var(--border);
  padding: 2rem 0;
  text-align: center;
}

footer p { color: var(--muted); font-size: 0.85rem; }
footer a { color: var(--muted); }
footer a:hover { color: var(--text); }

/* ── Responsive ────────────────────────────────────────────── */
@media (max-width: 600px) {
  .hero { padding: 3rem 0 2.5rem; }
  section { padding: 2.5rem 0; }
  .stats { gap: 1.5rem; }
}