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

/* ── Design tokens ── */
:root {
  --bg:         #0c0c0e;
  --surface:    #141416;
  --surface2:   #1c1c20;
  --surface3:   #242428;
  --border:     rgba(255,255,255,0.07);
  --border2:    rgba(255,255,255,0.13);
  --text:       #f0f0f2;
  --text2:      #9090a0;
  --text3:      #5a5a6a;
  --accent:     #7fff6f;
  --accent-dim: rgba(127,255,111,0.12);
  --red:        #ff6b6b;
  --red-dim:    rgba(255,107,107,0.12);
  --radius:     10px;
  --mono:       'IBM Plex Mono', monospace;
  --display:    'Syne', sans-serif;
}

html { font-size: 15px; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--mono);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ── Header / nav ── */
.site-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.4rem 2rem 0;
  flex-wrap: wrap;
}
.logo {
  font-family: var(--display);
  font-weight: 800;
  font-size: 1.35rem;
  letter-spacing: -0.03em;
  color: var(--text);
  text-decoration: none;
}
.logo-dot { color: var(--accent); }
.site-nav {
  display: flex;
  gap: 4px;
  margin-left: auto;
}
.nav-link {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--text3);
  text-decoration: none;
  padding: 0.35rem 0.8rem;
  border-radius: 6px;
  border: 1px solid transparent;
  transition: all 0.15s;
  letter-spacing: 0.02em;
}
.nav-link:hover { color: var(--text2); background: var(--surface2); }
.nav-link.active {
  color: var(--accent);
  background: var(--accent-dim);
  border-color: rgba(127,255,111,0.25);
}

/* ── Page hero ── */
.page-hero {
  padding: 2rem 2rem 0;
}
.page-hero h1 {
  font-family: var(--display);
  font-weight: 700;
  font-size: 1.6rem;
  letter-spacing: -0.03em;
  margin-bottom: 0.4rem;
}
.page-hero p {
  font-size: 0.8rem;
  color: var(--text2);
  max-width: 540px;
  line-height: 1.7;
}

/* ── Main ── */
main {
  flex: 1;
  padding: 1.5rem 2rem 2rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

/* ── Toolbar ── */
.toolbar {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.btn {
  font-family: var(--mono);
  font-size: 0.75rem;
  padding: 0.45rem 0.9rem;
  background: var(--surface2);
  border: 1px solid var(--border2);
  color: var(--text2);
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s;
  letter-spacing: 0.02em;
}
.btn:hover { background: var(--surface3); color: var(--text); border-color: rgba(255,255,255,0.2); }
.btn.primary { background: var(--accent-dim); border-color: rgba(127,255,111,0.35); color: var(--accent); }
.btn.primary:hover { background: rgba(127,255,111,0.2); }
.btn.danger { background: var(--red-dim); border-color: rgba(255,107,107,0.35); color: var(--red); }

.status-badge {
  font-size: 0.7rem;
  padding: 0.3rem 0.75rem;
  border-radius: 99px;
  margin-left: auto;
  border: 1px solid var(--border);
  color: var(--text3);
  background: var(--surface2);
  transition: all 0.2s;
  letter-spacing: 0.02em;
}
.status-badge.ok  { background: rgba(127,255,111,0.1); border-color: rgba(127,255,111,0.35); color: var(--accent); }
.status-badge.err { background: var(--red-dim); border-color: rgba(255,107,107,0.35); color: var(--red); }

/* ── Toggle group ── */
.toggle-group {
  display: flex;
  background: var(--surface2);
  border: 1px solid var(--border2);
  border-radius: 8px;
  overflow: hidden;
}
.toggle-btn {
  font-family: var(--mono);
  font-size: 0.72rem;
  padding: 0.42rem 0.9rem;
  background: transparent;
  border: none;
  color: var(--text3);
  cursor: pointer;
  transition: all 0.15s;
  letter-spacing: 0.02em;
}
.toggle-btn.active { background: var(--accent-dim); color: var(--accent); }

/* ── Split pane ── */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
@media (max-width: 680px) { .split { grid-template-columns: 1fr; } }

.pane-label {
  font-size: 0.65rem;
  color: var(--text3);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 6px;
}

/* ── Inputs / outputs ── */
textarea, .output-box {
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-family: var(--mono);
  font-size: 0.82rem;
  line-height: 1.75;
  padding: 1rem;
  resize: vertical;
  outline: none;
  transition: border-color 0.2s;
  min-height: 340px;
}
textarea:focus { border-color: var(--border2); }
textarea.has-error { border-color: var(--red); }
textarea::placeholder { color: var(--text3); }

.output-box {
  white-space: pre;
  overflow: auto;
  cursor: text;
  user-select: all;
  -webkit-user-select: all;
}
.output-box.success { border-color: rgba(127,255,111,0.2); }
.output-box.error   { border-color: var(--red); color: var(--red); white-space: pre-wrap; }

/* ── JSON syntax colours ── */
.jk { color: #6baaff; }  /* key   */
.js { color: #a8e6a3; }  /* str   */
.jn { color: #ffca6b; }  /* num   */
.jb { color: #ff9f6b; }  /* bool  */
.jz { color: var(--text3); } /* null */
.jp { color: var(--text3); } /* punct */

/* ── Stat cards (word counter) ── */
.stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
  gap: 8px;
}
.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.85rem 1.1rem;
}
.stat-label { font-size: 0.62rem; color: var(--text3); letter-spacing: 0.09em; text-transform: uppercase; margin-bottom: 5px; }
.stat-value { font-size: 1.5rem; font-family: var(--display); font-weight: 700; color: var(--text); line-height: 1; }
.stat-value.accent { color: var(--accent); }

/* ── Word frequency bars ── */
.freq-section { display: none; }
.freq-title { font-size: 0.62rem; color: var(--text3); letter-spacing: 0.09em; text-transform: uppercase; margin-bottom: 8px; }
.freq-list { display: flex; flex-direction: column; gap: 5px; max-height: 200px; overflow-y: auto; }
.freq-item { display: flex; align-items: center; gap: 8px; }
.freq-word { font-size: 0.72rem; color: var(--text2); min-width: 90px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.freq-bar-wrap { flex: 1; background: var(--surface2); border-radius: 3px; height: 5px; overflow: hidden; }
.freq-bar { height: 100%; background: var(--accent); border-radius: 3px; transition: width 0.35s ease; }
.freq-count { font-size: 0.67rem; color: var(--text3); min-width: 22px; text-align: right; }

/* ── Copy toast ── */
.copy-toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(10px);
  background: var(--surface3);
  border: 1px solid var(--border2);
  color: var(--accent);
  font-size: 0.75rem;
  padding: 0.5rem 1.3rem;
  border-radius: 99px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s, transform 0.2s;
  z-index: 999;
  font-family: var(--mono);
  letter-spacing: 0.04em;
  white-space: nowrap;
}
.copy-toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ── Footer ── */
.site-footer {
  padding: 1.5rem 2rem;
  border-top: 1px solid var(--border);
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  align-items: center;
}
.footer-links { display: flex; gap: 1rem; margin-left: auto; }
.footer-links a {
  font-size: 0.7rem;
  color: var(--text3);
  text-decoration: none;
  transition: color 0.15s;
}
.footer-links a:hover { color: var(--text2); }
.footer-copy { font-size: 0.7rem; color: var(--text3); }

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--surface3); border-radius: 3px; }

/* ══════════════════════════════════════
   MOBILE NAV — collapsible dropdown
   ══════════════════════════════════════ */
.site-header {
  position: relative;
}
.nav-toggle {
  display: none;
  font-family: var(--mono);
  font-size: 0.75rem;
  background: var(--surface2);
  border: 1px solid var(--border2);
  color: var(--text2);
  border-radius: 6px;
  padding: 0.4rem 0.8rem;
  cursor: pointer;
  margin-left: auto;
  letter-spacing: 0.03em;
}
.nav-toggle:hover { color: var(--text); border-color: rgba(255,255,255,0.2); }

/* Category nav (desktop) */
.site-nav {
  display: flex;
  gap: 4px;
  flex-wrap: nowrap;
  align-items: center;
}
/* Divider between categories */
.nav-divider {
  width: 1px;
  height: 14px;
  background: var(--border2);
  margin: 0 2px;
  flex-shrink: 0;
}

@media (max-width: 900px) {
  .nav-toggle { display: block; }
  .site-nav {
    display: none;
    position: absolute;
    top: calc(100% + 8px);
    right: 2rem;
    background: var(--surface2);
    border: 1px solid var(--border2);
    border-radius: 10px;
    padding: 0.6rem;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    z-index: 999;
    min-width: 200px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.4);
  }
  .site-nav.open { display: flex; }
  .nav-link { padding: 0.45rem 0.8rem; font-size: 0.78rem; }
  .nav-divider { width: 100%; height: 1px; margin: 4px 0; }
  .nav-category-label {
    font-size: 0.58rem;
    color: var(--text3);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    padding: 0.3rem 0.8rem 0.1rem;
  }
}

/* ══════════════════════════════════════
   FAQ SECTION
   ══════════════════════════════════════ */
.faq-section {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}
.faq-title {
  font-family: var(--display);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text2);
  margin-bottom: 0.8rem;
}
.faq-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 6px;
  overflow: hidden;
}
.faq-q {
  font-size: 0.8rem;
  color: var(--text);
  padding: 0.85rem 1rem;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem;
  user-select: none;
  -webkit-user-select: none;
  transition: background 0.15s;
}
.faq-q:hover { background: var(--surface2); }
.faq-q::after {
  content: '+';
  color: var(--accent);
  font-size: 1rem;
  flex-shrink: 0;
  transition: transform 0.2s;
}
.faq-item.open .faq-q::after { content: '−'; }
.faq-a {
  display: none;
  font-size: 0.78rem;
  color: var(--text2);
  line-height: 1.8;
  padding: 0 1rem 0.9rem;
  border-top: 1px solid var(--border);
}
.faq-item.open .faq-a { display: block; }
.faq-a code {
  background: var(--surface2);
  padding: 1px 5px;
  border-radius: 3px;
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--accent);
}

/* ══════════════════════════════════════
   AdSense ad slot placeholder
   ══════════════════════════════════════ */
.ad-slot {
  width: 100%;
  min-height: 90px;
  background: var(--surface);
  border: 1px dashed var(--border2);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.65rem;
  color: var(--text3);
  letter-spacing: 0.07em;
  text-transform: uppercase;
}