/* TextKit — shared styles. Pure static, no build step, works from file:// */
:root {
  --primary: #4f46e5;
  --primary-dark: #4338ca;
  --primary-light: #eef2ff;
  --text: #1e293b;
  --muted: #64748b;
  --border: #e2e8f0;
  --bg: #f8fafc;
  --card: #ffffff;
  --radius: 12px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Header */
.site-header {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 100;
}
.header-inner {
  max-width: 1024px; margin: 0 auto; padding: 0 20px;
  display: flex; align-items: center; justify-content: space-between;
  height: 60px;
}
.logo { font-size: 1.35rem; font-weight: 800; color: var(--text); }
.logo span { color: var(--primary); }
.logo:hover { text-decoration: none; }
.nav { display: flex; gap: 4px; align-items: center; }
.nav a {
  color: var(--muted); font-size: 0.92rem; font-weight: 500;
  padding: 8px 12px; border-radius: 8px; white-space: nowrap;
}
.nav a:hover { background: var(--primary-light); color: var(--primary); text-decoration: none; }
.nav a.active { color: var(--primary); background: var(--primary-light); }

/* Layout */
.container { max-width: 1024px; margin: 0 auto; padding: 32px 20px 64px; }
.breadcrumb { font-size: 0.85rem; color: var(--muted); margin-bottom: 12px; }
h1 { font-size: 2rem; line-height: 1.25; margin-bottom: 8px; letter-spacing: -0.02em; }
h2 { font-size: 1.3rem; margin: 36px 0 12px; letter-spacing: -0.01em; }
h3 { font-size: 1.05rem; margin: 20px 0 8px; }
.lede { color: var(--muted); font-size: 1.05rem; margin-bottom: 24px; max-width: 720px; }
p { margin-bottom: 12px; }
section p, section li { color: #334155; }
ol, ul { margin: 0 0 12px 22px; }
li { margin-bottom: 6px; }

/* Hero (homepage) */
.hero { text-align: center; padding: 48px 20px 36px; }
.hero h1 { font-size: 2.4rem; }
.hero p { color: var(--muted); font-size: 1.1rem; max-width: 640px; margin: 0 auto 24px; }
.hero-badges { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }
.badge {
  background: var(--card); border: 1px solid var(--border); border-radius: 999px;
  padding: 6px 14px; font-size: 0.85rem; color: var(--muted); font-weight: 500;
}

/* Tool grid (homepage) */
.tool-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px; margin-top: 24px;
}
.tool-card-link {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 20px; display: block; transition: transform .12s ease, box-shadow .12s ease;
}
.tool-card-link:hover { text-decoration: none; transform: translateY(-2px); box-shadow: 0 8px 24px rgba(79,70,229,.10); }
.tool-icon { font-size: 1.7rem; margin-bottom: 10px; }
.tool-card-link h3 { margin: 0 0 6px; font-size: 1rem; color: var(--text); }
.tool-card-link p { margin: 0; font-size: 0.87rem; color: var(--muted); }

/* Tool UI */
.tool-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 24px; margin-bottom: 20px;
  box-shadow: 0 1px 3px rgba(15,23,42,.04);
}
textarea, input[type="text"], input[type="number"], select {
  width: 100%; border: 1px solid var(--border); border-radius: 8px;
  padding: 12px 14px; font-size: 0.95rem; font-family: inherit; color: var(--text);
  background: #fff; resize: vertical;
}
textarea:focus, input:focus, select:focus {
  outline: 2px solid var(--primary); outline-offset: -1px; border-color: var(--primary);
}
textarea { min-height: 180px; line-height: 1.6; }
.output-area {
  background: var(--bg); border: 1px solid var(--border); border-radius: 8px;
  padding: 14px; min-height: 120px; white-space: pre-wrap; word-break: break-word;
  font-size: 0.95rem; margin-top: 12px;
}
.toolbar { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 12px; align-items: center; }
button, .btn {
  background: var(--primary); color: #fff; border: none; border-radius: 8px;
  padding: 10px 18px; font-size: 0.92rem; font-weight: 600; cursor: pointer;
  font-family: inherit; transition: background .12s ease;
}
button:hover, .btn:hover { background: var(--primary-dark); }
button.secondary {
  background: #fff; color: var(--text); border: 1px solid var(--border);
}
button.secondary:hover { background: var(--bg); }
button:disabled { opacity: .5; cursor: default; }
.checkbox-row { display: flex; gap: 18px; flex-wrap: wrap; margin-top: 12px; font-size: 0.9rem; color: #334155; }
.checkbox-row label { display: flex; align-items: center; gap: 6px; cursor: pointer; }
.checkbox-row input { width: auto; accent-color: var(--primary); }

/* Stats */
.stats-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 12px; margin-top: 16px;
}
.stat {
  background: var(--primary-light); border-radius: 10px; padding: 14px 12px; text-align: center;
}
.stat .num { font-size: 1.5rem; font-weight: 800; color: var(--primary-dark); line-height: 1.2; }
.stat .lbl { font-size: 0.78rem; color: var(--muted); font-weight: 500; margin-top: 2px; }
.keyword-table { width: 100%; border-collapse: collapse; margin-top: 12px; font-size: 0.9rem; }
.keyword-table th, .keyword-table td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--border); }
.keyword-table th { color: var(--muted); font-weight: 600; font-size: 0.8rem; text-transform: uppercase; }

/* Ad placeholder */
.ad-slot {
  border: 1.5px dashed var(--border); border-radius: var(--radius);
  background: #fff; color: #b6c2d2; text-align: center;
  padding: 28px 12px; font-size: 0.82rem; letter-spacing: .08em; text-transform: uppercase;
  margin: 24px 0;
}

/* FAQ */
details {
  background: var(--card); border: 1px solid var(--border); border-radius: 10px;
  padding: 14px 16px; margin-bottom: 10px;
}
summary { font-weight: 600; cursor: pointer; font-size: 0.95rem; }
summary::-webkit-details-marker { color: var(--primary); }
details p { margin: 8px 0 0; font-size: 0.93rem; color: #475569; }

/* Related */
.related { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 8px; }
.related a {
  background: var(--card); border: 1px solid var(--border); border-radius: 999px;
  padding: 8px 16px; font-size: 0.88rem; font-weight: 500; color: var(--text);
}
.related a:hover { border-color: var(--primary); color: var(--primary); text-decoration: none; }

/* Footer */
.site-footer { background: var(--card); border-top: 1px solid var(--border); margin-top: 40px; }
.footer-inner {
  max-width: 1024px; margin: 0 auto; padding: 36px 20px;
  display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 32px;
}
.footer-inner h4 { font-size: 0.9rem; margin-bottom: 10px; }
.footer-inner p, .footer-inner a { font-size: 0.88rem; color: var(--muted); }
.footer-inner ul { list-style: none; margin: 0; }
.footer-inner li { margin-bottom: 6px; }
.footer-bottom {
  border-top: 1px solid var(--border); text-align: center;
  padding: 16px 20px; font-size: 0.82rem; color: #94a3b8;
}

.toast {
  position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%) translateY(20px);
  background: var(--text); color: #fff; padding: 10px 20px; border-radius: 999px;
  font-size: 0.88rem; opacity: 0; pointer-events: none; transition: all .25s ease; z-index: 200;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

@media (max-width: 640px) {
  h1 { font-size: 1.6rem; }
  .hero h1 { font-size: 1.9rem; }
  .nav a { padding: 8px 8px; font-size: 0.85rem; }
  .nav .hide-mobile { display: none; }
  .tool-card { padding: 16px; }
  .footer-inner { grid-template-columns: 1fr; gap: 20px; }
}