:root {
  --bg: #fafafa;
  --surface: #ffffff;
  --border: #e5e5e5;
  --text: #1a1a1a;
  --text-secondary: #666;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,.08);
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{font-size:16px;-webkit-text-size-adjust:100%}
body{
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}

/* Header */
.site-header{
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 0 24px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 10;
}
.site-header .logo{
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 8px;
}
.site-header .logo svg{width:24px;height:24px}
.site-header nav{display:flex;gap:8px}
.site-header nav a{
  padding: 6px 14px;
  border-radius: var(--radius);
  font-size: .875rem;
  color: var(--text-secondary);
  font-weight: 500;
  transition: background .15s, color .15s;
}
.site-header nav a:hover{background:var(--bg);color:var(--text);text-decoration:none}

/* Main */
.main-content{flex:1;max-width:960px;width:100%;margin:0 auto;padding:32px 24px}

/* Homepage */
.hero{padding:48px 0 32px}
.hero h1{font-size:2rem;font-weight:700;margin-bottom:12px}
.hero p{color:var(--text-secondary);font-size:1.1rem;max-width:600px}
.tool-grid{
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
  padding: 24px 0;
}
.tool-card{
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  transition: box-shadow .15s, border-color .15s;
}
.tool-card:hover{
  box-shadow: var(--shadow);
  border-color: #ccc;
  text-decoration: none;
}
.tool-card h3{font-size:1rem;font-weight:600;margin-bottom:6px;color:var(--text)}
.tool-card p{font-size:.85rem;color:var(--text-secondary);line-height:1.5}

/* Category heading */
.category-title{
  font-size: .8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .05em;
  color: var(--text-secondary);
  padding: 24px 0 8px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 16px;
}

/* Tool page */
.tool-page h1{font-size:1.5rem;font-weight:700;margin-bottom:8px}
.tool-page .desc{color:var(--text-secondary);margin-bottom:24px;font-size:.95rem}
.tool-workspace{
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 32px;
}
.tool-workspace label{
  display: block;
  font-size: .85rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text);
}
.tool-workspace textarea,
.tool-workspace input[type="text"],
.tool-workspace select{
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: .9rem;
  font-family: "SF Mono", "Fira Code", "Fira Mono", monospace;
  resize: vertical;
  background: var(--bg);
  color: var(--text);
}
.tool-workspace textarea:focus,
.tool-workspace input:focus,
.tool-workspace select:focus{
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(37,99,235,.1);
}
.tool-workspace .btn-row{
  display: flex;gap:8px;margin-top:12px;flex-wrap:wrap
}
.btn{
  padding: 8px 18px;
  border-radius: 6px;
  font-size: .875rem;
  font-weight: 500;
  cursor: pointer;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  transition: all .15s;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.btn:hover{background:var(--bg)}
.btn-primary{
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.btn-primary:hover{background:var(--accent-hover)}
.btn-sm{padding:5px 12px;font-size:.8rem}

/* Related tools */
.related-tools{margin-top: 40px;padding-top: 24px;border-top: 1px solid var(--border)}
.related-tools h3{font-size:.95rem;margin-bottom:12px}
.related-tools .links{display:flex;flex-wrap:wrap;gap:8px}
.related-tools .links a{
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: 20px;
  font-size: .85rem;
  color: var(--text-secondary);
  transition: all .15s;
}
.related-tools .links a:hover{
  border-color: var(--accent);
  color: var(--accent);
  text-decoration: none;
}

/* Footer */
.site-footer{
  border-top: 1px solid var(--border);
  padding: 24px;
  text-align: center;
  font-size: .8rem;
  color: var(--text-secondary);
}

/* Error / success states */
.error-msg{color:#dc2626;font-size:.85rem;margin-top:6px}
.success-msg{color:#16a34a;font-size:.85rem;margin-top:6px}

/* Ad placeholder */
.ad-slot{
  background: var(--bg);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  height: 90px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  font-size: .8rem;
  margin: 24px 0;
}

/* Responsive */
@media(max-width:640px){
  .site-header{padding:0 16px}
  .main-content{padding:24px 16px}
  .hero h1{font-size:1.5rem}
  .tool-workspace{padding:16px}
  .tool-grid{grid-template-columns:1fr}
}