@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;600;700&family=Rajdhani:wght@400;500;600;700;900&family=Source+Serif+4:ital,wght@0,400;0,600;1,400&display=swap');

:root {
  --bg: #0d0f14;
  --surface: #141720;
  --surface2: #1b1f2e;
  --border: #252a3a;
  --accent: #e8a020;
  --accent2: #3a8fff;
  --text: #c8cdd8;
  --text-dim: #7a8099;
  --text-bright: #eef0f5;
  --green: #4ec94e;
  --red: #e05c5c;
  --purple: #a78bfa;
  --code-bg: #0a0c10;
  --topbar-h: 56px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Source Serif 4', Georgia, serif;
  font-size: 16px;
  line-height: 1.75;
  min-height: 100vh;
}

/* ── TOPBAR ── */
.topbar {
  background: #090b0f;
  border-bottom: 2px solid var(--accent);
  padding: 0 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--topbar-h);
  position: sticky;
  top: 0;
  z-index: 200;
}
.logo {
  font-family: 'Rajdhani', sans-serif;
  font-weight: 900;
  font-size: 22px;
  color: var(--accent);
  letter-spacing: 3px;
  text-transform: uppercase;
  text-decoration: none;
}
.logo span { color: var(--text-bright); }
.nav { display: flex; gap: 28px; align-items: center; }
.nav a {
  font-family: 'Rajdhani', sans-serif;
  font-weight: 600;
  font-size: 13px;
  color: var(--text-dim);
  text-decoration: none;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  transition: color .2s;
}
.nav a:hover, .nav a.active { color: var(--accent); }

/* ── BUTTONS ── */
.btn {
  display: inline-block;
  font-family: 'Rajdhani', sans-serif;
  font-weight: 700;
  font-size: 12px;
  letter-spacing: 2px;
  text-transform: uppercase;
  padding: 8px 18px;
  border-radius: 3px;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: background .15s, opacity .15s;
}
.btn-accent  { background: var(--accent);  color: #0d0f14; }
.btn-accent:hover { background: #f0b830; }
.btn-ghost   { background: transparent; color: var(--text-dim); border: 1px solid var(--border); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }
.btn-danger  { background: var(--red); color: #fff; }
.btn-danger:hover { opacity: .85; }
.btn-blue    { background: var(--accent2); color: #fff; }
.btn-blue:hover { opacity: .85; }

/* ── BADGES ── */
.badge {
  font-family: 'Rajdhani', sans-serif;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  padding: 3px 10px;
  border-radius: 3px;
}
.badge-beginner    { background: #1a3a1a; color: var(--green);  border: 1px solid #2a5a2a; }
.badge-intermediate{ background: #1a1f0a; color: var(--accent); border: 1px solid #3a2a0a; }
.badge-advanced    { background: #2a1010; color: var(--red);    border: 1px solid #4a2020; }
.badge-cpp    { background: #1a1f3a; color: var(--accent2); border: 1px solid #252f5a; }
.badge-winapi { background: #2a1a0a; color: var(--accent);  border: 1px solid #4a2a0a; }
.badge-asm    { background: #1a0e2a; color: var(--purple);  border: 1px solid #2a1e4a; }

/* ── CARDS ── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
}
.card-header {
  background: #0f1118;
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  font-family: 'Rajdhani', sans-serif;
  font-weight: 700;
  font-size: 11px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--text-dim);
}
.card-body { padding: 16px; }

/* ── FOOTER ── */
footer {
  background: #090b0f;
  border-top: 1px solid var(--border);
  padding: 24px 48px;
  text-align: center;
  font-family: 'Rajdhani', sans-serif;
  font-size: 13px;
  color: var(--text-dim);
  letter-spacing: 1px;
  margin-top: 80px;
}
footer span { color: var(--accent); }

/* ── FORMS ── */
.form-group { margin-bottom: 18px; }
.form-label {
  display: block;
  font-family: 'Rajdhani', sans-serif;
  font-weight: 600;
  font-size: 12px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 6px;
}
.form-input, .form-select, .form-textarea {
  width: 100%;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 10px 14px;
  color: var(--text-bright);
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  outline: none;
  transition: border-color .2s;
}
.form-input:focus, .form-select:focus, .form-textarea:focus {
  border-color: var(--accent);
}
.form-textarea { resize: vertical; min-height: 120px; }
.form-select { cursor: pointer; }
option { background: var(--surface); }

/* ── SECTION HEADER ── */
.section-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
}
.section-title {
  font-family: 'Rajdhani', sans-serif;
  font-weight: 700;
  font-size: 18px;
  color: var(--text-bright);
  letter-spacing: 1px;
  text-transform: uppercase;
  white-space: nowrap;
}
.section-line { flex: 1; height: 1px; background: var(--border); }
.section-count {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--text-dim);
  white-space: nowrap;
}

/* ── UTILITIES ── */
.mt-sm { margin-top: 8px; }
.mt-md { margin-top: 16px; }
.mt-lg { margin-top: 32px; }
.flex   { display: flex; }
.gap-sm { gap: 8px; }
.gap-md { gap: 16px; }
.hidden { display: none !important; }
.mono {
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
}

/* ── TOAST ── */
#toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-left: 3px solid var(--green);
  color: var(--text-bright);
  font-family: 'Rajdhani', sans-serif;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .5px;
  padding: 12px 20px;
  border-radius: 4px;
  z-index: 9999;
  opacity: 0;
  transform: translateY(10px);
  transition: opacity .3s, transform .3s;
  pointer-events: none;
}
#toast.show { opacity: 1; transform: translateY(0); }
#toast.error { border-left-color: var(--red); }

/* ── AUTH NAV ── */
#authNav .btn { font-size: 11px; }

/* ── PAYWALL (used in article.html) ── */
.paywall {
  background: linear-gradient(160deg, #0f1520 0%, #0d0f14 100%);
  border: 1px solid var(--accent);
  border-radius: 8px;
  padding: 48px 40px;
  text-align: center;
  margin: 32px 0;
}

@media (max-width: 768px) {
  .topbar { padding: 0 20px; }
  footer  { padding: 20px; }
}