:root {
  --bg:        #0d1117;
  --bg-card:   #161b22;
  --bg-hover:  #1c2128;
  --border:    #30363d;
  --text:      #e6edf3;
  --muted:     #8b949e;
  --accent:    #58a6ff;
  --green:     #3fb950;
  --yellow:    #d29922;
  --red:       #f85149;
  --purple:    #bc8cff;
  --orange:    #ffa657;

  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
  --radius:    8px;
  --max-width: 960px;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.6;
  min-height: 100vh;
}

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

/* ── Layout ──────────────────────────────────────────────────────────────────── */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ── Header ──────────────────────────────────────────────────────────────────── */
header {
  border-bottom: 1px solid var(--border);
  padding: 20px 0;
  margin-bottom: 40px;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 18px;
  font-weight: 600;
  color: var(--text);
  text-decoration: none;
}

.logo svg { color: var(--accent); flex-shrink: 0; }

.social-links {
  display: flex;
  align-items: center;
  gap: 10px;
}
.social-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--muted);
  opacity: 0.5;
  transition: opacity 0.2s, color 0.2s;
  padding: 2px;
}
.social-icon:hover { opacity: 1; color: var(--accent); }

.header-meta {
  font-size: 13px;
  color: var(--muted);
}

/* ── Hero (index) ────────────────────────────────────────────────────────────── */
.hero {
  margin-bottom: 40px;
  text-align: center;
}

.hero h1 {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text);
}

.hero p {
  color: var(--muted);
  max-width: 540px;
  margin: 0 auto;
}

/* ── Filters ─────────────────────────────────────────────────────────────────── */
.filters {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 28px;
  justify-content: center;
}

.filter-btn {
  padding: 5px 14px;
  border-radius: 20px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--muted);
  font-size: 13px;
  cursor: pointer;
  transition: all 0.15s;
}

.filter-btn:hover,
.filter-btn.active {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(88, 166, 255, 0.08);
}

/* ── Stats bar ───────────────────────────────────────────────────────────────── */
.stats-bar {
  display: flex;
  gap: 24px;
  margin-bottom: 32px;
  flex-wrap: wrap;
  justify-content: center;
}

.stat {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.stat-value {
  font-size: 22px;
  font-weight: 700;
  color: var(--text);
  font-variant-numeric: tabular-nums;
}

.stat-label {
  font-size: 12px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* ── Cards grid ──────────────────────────────────────────────────────────────── */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s, transform 0.1s;
  display: flex;
  flex-direction: column;
  gap: 12px;
  text-decoration: none;
  color: inherit;
}

.card:hover {
  border-color: var(--accent);
  background: var(--bg-hover);
  transform: translateY(-1px);
  text-decoration: none;
}

.card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 8px;
}

.card-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  font-family: var(--font-mono);
}

.card-meta {
  display: flex;
  gap: 6px;
  align-items: center;
  flex-wrap: wrap;
}

.card-date {
  font-size: 12px;
  color: var(--muted);
  margin-top: auto;
}

.card-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

/* ── Badges ──────────────────────────────────────────────────────────────────── */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 11px;
  font-weight: 500;
  border: 1px solid transparent;
  white-space: nowrap;
}

.badge-difficulty-Easy    { color: var(--green);  border-color: rgba(63,185,80,.3);  background: rgba(63,185,80,.08);  }
.badge-difficulty-Medium  { color: var(--yellow); border-color: rgba(210,153,34,.3); background: rgba(210,153,34,.08); }
.badge-difficulty-Hard    { color: var(--red);    border-color: rgba(248,81,73,.3);  background: rgba(248,81,73,.08);  }
.badge-difficulty-Insane  { color: var(--purple); border-color: rgba(188,140,255,.3);background: rgba(188,140,255,.08);}

.badge-platform-HackTheBox { color: var(--green);  border-color: rgba(63,185,80,.3);  background: rgba(63,185,80,.08);  }
.badge-platform-TryHackMe  { color: var(--red);    border-color: rgba(248,81,73,.3);  background: rgba(248,81,73,.08);  }
.badge-platform-Other      { color: var(--muted);  border-color: var(--border);       background: transparent; }

.badge-tag {
  color: var(--muted);
  border-color: var(--border);
  background: transparent;
  font-family: var(--font-mono);
  font-size: 10px;
}

/* ── Empty state ─────────────────────────────────────────────────────────────── */
.empty {
  grid-column: 1/-1;
  text-align: center;
  padding: 60px 20px;
  color: var(--muted);
}

.empty svg { margin-bottom: 16px; opacity: 0.4; }
.empty p { font-size: 14px; }

/* ── Writeup page ────────────────────────────────────────────────────────────── */
.writeup-header {
  margin-bottom: 36px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border);
}

.writeup-title {
  font-size: 32px;
  font-weight: 700;
  font-family: var(--font-mono);
  margin-bottom: 12px;
  color: var(--text);
}

.writeup-meta {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
  margin-bottom: 12px;
}

.writeup-date {
  font-size: 13px;
  color: var(--muted);
}

.writeup-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-top: 8px;
}

/* ── Writeup content (markdown rendered) ─────────────────────────────────────── */
.writeup-body {
  max-width: 720px;
}

.writeup-body h2 {
  font-size: 18px;
  font-weight: 600;
  color: var(--text);
  margin: 36px 0 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 8px;
}

.writeup-body h2::before {
  content: '#';
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 16px;
}

.writeup-body h3 {
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
  margin: 24px 0 8px;
}

.writeup-body p {
  color: var(--text);
  margin-bottom: 12px;
  line-height: 1.75;
}

.writeup-body code {
  font-family: var(--font-mono);
  font-size: 13px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1px 6px;
  color: var(--orange);
}

.writeup-body pre {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  overflow-x: auto;
  margin: 16px 0;
}

.writeup-body pre code {
  background: none;
  border: none;
  padding: 0;
  color: var(--text);
  font-size: 13px;
  line-height: 1.6;
}

.writeup-body ul, .writeup-body ol {
  padding-left: 24px;
  margin-bottom: 12px;
}

.writeup-body li { margin-bottom: 4px; color: var(--text); }

.writeup-body strong { color: var(--text); font-weight: 600; }

.writeup-body a { color: var(--accent); }

/* ── LinkedIn panel ──────────────────────────────────────────────────────────── */
.linkedin-panel {
  margin-top: 48px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
  max-width: 720px;
}

.linkedin-panel h3 {
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.linkedin-panel p {
  color: var(--text);
  line-height: 1.75;
  white-space: pre-wrap;
}

.copy-btn {
  margin-top: 14px;
  padding: 6px 14px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: transparent;
  color: var(--muted);
  font-size: 13px;
  cursor: pointer;
  transition: all 0.15s;
}

.copy-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.copy-btn.copied {
  border-color: var(--green);
  color: var(--green);
}

/* ── Back link ───────────────────────────────────────────────────────────────── */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--muted);
  font-size: 14px;
  margin-bottom: 28px;
  transition: color 0.15s;
}

.back-link:hover { color: var(--accent); text-decoration: none; }

/* ── Loading / Error ─────────────────────────────────────────────────────────── */
.loading {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 14px;
  padding: 40px 0;
}

.spinner {
  width: 16px; height: 16px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  flex-shrink: 0;
}

@keyframes spin { to { transform: rotate(360deg); } }

.error-msg {
  color: var(--red);
  font-size: 14px;
  padding: 16px;
  border: 1px solid rgba(248,81,73,.3);
  border-radius: var(--radius);
  background: rgba(248,81,73,.06);
}

/* ── Media sectie ────────────────────────────────────────────────────────────── */
.media-section {
  margin-top: 48px;
  max-width: 720px;
}

.media-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
  border: none;
  padding: 0;
}

.media-title::before { display: none; }

.media-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}

.media-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}

.media-card-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 14px;
}

.audio-label {
  font-size: 11px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 6px;
}

audio {
  border-radius: 6px;
  height: 36px;
  filter: invert(1) hue-rotate(180deg) brightness(0.85);
}

.slides-buttons {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.slides-btn {
  display: block;
  padding: 10px 16px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  font-size: 13px;
  font-weight: 500;
  text-align: center;
  transition: all 0.15s;
  text-decoration: none;
}

.slides-btn-tech {
  color: var(--accent);
  border-color: rgba(88,166,255,.3);
  background: rgba(88,166,255,.06);
}

.slides-btn-tech:hover {
  background: rgba(88,166,255,.14);
  text-decoration: none;
}

.slides-btn-non {
  color: var(--green);
  border-color: rgba(63,185,80,.3);
  background: rgba(63,185,80,.06);
}

.slides-btn-non:hover {
  background: rgba(63,185,80,.14);
  text-decoration: none;
}

.media-pending {
  display: flex;
  align-items: center;
  color: var(--muted);
  font-size: 13px;
  padding: 16px 0;
}

/* ── Footer ──────────────────────────────────────────────────────────────────── */
footer {
  border-top: 1px solid var(--border);
  padding: 20px 0;
  margin-top: 60px;
  font-size: 12px;
  color: var(--muted);
  text-align: center;
}

/* ── Language selector overlay ───────────────────────────────────────────────── */
.lang-overlay {
  position: fixed;
  inset: 0;
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
}

.lang-overlay.hidden { display: none; }

.lang-selector-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 48px 40px;
  max-width: 360px;
  width: 100%;
}

.lang-logo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 64px;
  height: 64px;
  border-radius: 18px;
  background: rgba(88, 166, 255, 0.1);
  border: 1px solid rgba(88, 166, 255, 0.2);
  color: var(--accent);
  margin-bottom: 24px;
}

.lang-site-title {
  font-size: 26px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
  font-family: var(--font-mono);
}

.lang-subtitle {
  color: var(--muted);
  font-size: 14px;
  margin-bottom: 48px;
  line-height: 1.5;
}

.lang-options {
  display: flex;
  gap: 20px;
  justify-content: center;
}

.lang-option-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: 20px 24px;
  border-radius: 14px;
  border: 2px solid var(--border);
  background: var(--bg-card);
  cursor: pointer;
  transition: all 0.2s;
}

.lang-option-btn:hover {
  border-color: var(--accent);
  background: var(--bg-hover);
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.3);
}

.flag-svg {
  width: 56px;
  height: 38px;
  border-radius: 4px;
  display: block;
  overflow: hidden;
}

.lang-code {
  font-size: 13px;
  font-weight: 700;
  color: var(--muted);
  letter-spacing: 0.08em;
  font-family: var(--font-mono);
}

/* ── Language flags in header ────────────────────────────────────────────────── */
.lang-flags-header {
  display: flex;
  gap: 6px;
  align-items: center;
}

.lang-flag-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 8px 4px 6px;
  border-radius: 20px;
  border: 2px solid transparent;
  background: transparent;
  cursor: pointer;
  transition: all 0.2s;
  opacity: 0.45;
}

.lang-flag-btn:hover {
  opacity: 0.8;
  border-color: var(--border);
}

:lang(nl) .lang-flag-btn[data-lang="nl"],
:lang(en) .lang-flag-btn[data-lang="en"] {
  border-color: var(--accent);
  background: rgba(88, 166, 255, 0.15);
  opacity: 1;
  box-shadow: 0 0 0 1px rgba(88, 166, 255, 0.3);
}

.flag-svg-sm {
  width: 22px;
  height: 15px;
  border-radius: 2px;
  display: block;
  flex-shrink: 0;
  overflow: hidden;
}

.lang-switch-code {
  font-size: 11px;
  font-weight: 700;
  color: var(--muted);
  letter-spacing: 0.06em;
  font-family: var(--font-mono);
}

/* ── Hidden utility ──────────────────────────────────────────────────────────── */
.hidden { display: none !important; }

/* ── Responsive ──────────────────────────────────────────────────────────────── */
@media (max-width: 600px) {
  .hero h1 { font-size: 22px; }
  .stats-bar { gap: 16px; }
  .cards { grid-template-columns: 1fr; }
  .writeup-title { font-size: 24px; }
  .lang-options { flex-direction: column; align-items: center; }
  .lang-option-btn { width: 100%; max-width: 200px; flex-direction: row; padding: 16px 24px; }
}