/* DevToolbox - Clean utility-first design */
:root { --bg:#0f172a; --card:#1e293b; --accent:#38bdf8; --text:#e2e8f0; --muted:#94a3b8; --border:#334155; --hover:#2d3a50; }
* { margin:0; padding:0; box-sizing:border-box; }
body { background:var(--bg); color:var(--text); font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; line-height:1.6; min-height:100vh; display:flex; flex-direction:column; }
.container { max-width:1200px; margin:0 auto; padding:0 20px; }

/* Header */
.header { background:var(--card); border-bottom:1px solid var(--border); position:sticky; top:0; z-index:100; }
.header .container { display:flex; align-items:center; justify-content:space-between; height:60px; }
.logo { font-size:22px; font-weight:700; color:var(--accent); text-decoration:none; }
.nav { display:flex; gap:24px; }
.nav a { color:var(--muted); text-decoration:none; font-size:14px; transition:color .2s; }
.nav a:hover { color:var(--text); }

/* Hero */
.hero { text-align:center; padding:60px 0 40px; }
.hero h1 { font-size:36px; margin-bottom:12px; background:linear-gradient(135deg,#38bdf8,#818cf8); -webkit-background-clip:text; -webkit-text-fill-color:transparent; }
.hero p { color:var(--muted); font-size:17px; }

/* Tool Grid */
.tools-grid { display:grid; grid-template-columns:repeat(auto-fill,minmax(260px,1fr)); gap:16px; padding:0 0 60px; }
.tool-card { background:var(--card); border:1px solid var(--border); border-radius:10px; padding:24px; text-decoration:none; color:var(--text); transition:all .2s; }
.tool-card:hover { border-color:var(--accent); transform:translateY(-2px); background:var(--hover); }
.tool-icon { font-size:28px; margin-bottom:12px; width:48px; height:48px; display:flex; align-items:center; justify-content:center; background:rgba(56,189,248,.1); border-radius:10px; color:var(--accent); }
.tool-card h3 { font-size:16px; margin-bottom:6px; }
.tool-card p { color:var(--muted); font-size:13px; }

/* About */
.about { padding:40px 0 60px; border-top:1px solid var(--border); }
.about h2 { text-align:center; margin-bottom:32px; font-size:24px; }
.features { display:grid; grid-template-columns:repeat(auto-fit,minmax(200px,1fr)); gap:20px; }
.feature { background:var(--card); border:1px solid var(--border); border-radius:10px; padding:20px; text-align:center; }
.feature strong { display:block; margin-bottom:8px; color:var(--accent); }
.feature p { color:var(--muted); font-size:13px; }

/* Footer */
.footer { margin-top:auto; background:var(--card); border-top:1px solid var(--border); padding:20px 0; text-align:center; }
.footer p { color:var(--muted); font-size:13px; }

/* Tool Page Common */
.tool-page { padding:30px 0 50px; }
.tool-page h2 { font-size:24px; margin-bottom:4px; }
.tool-page .desc { color:var(--muted); margin-bottom:24px; }
.tool-wrap { display:grid; grid-template-columns:1fr 1fr; gap:16px; height:500px; }
.tool-wrap.full { grid-template-columns:1fr; }
textarea, .output-box { background:var(--card); border:1px solid var(--border); border-radius:8px; padding:16px; font-family:'Fira Code','Cascadia Code',Consolas,monospace; font-size:14px; color:var(--text); resize:vertical; min-height:300px; }
textarea:focus { outline:none; border-color:var(--accent); }
.output-box { overflow:auto; white-space:pre-wrap; word-break:break-all; }
.btn-row { display:flex; gap:10px; margin-bottom:16px; flex-wrap:wrap; }
button, .btn { background:var(--accent); color:#0f172a; border:none; padding:10px 20px; border-radius:6px; font-size:14px; font-weight:600; cursor:pointer; transition:opacity .2s; }
button:hover, .btn:hover { opacity:.85; }
button.ghost { background:transparent; border:1px solid var(--border); color:var(--text); }
select { background:var(--card); color:var(--text); border:1px solid var(--border); border-radius:6px; padding:8px 12px; font-size:14px; }
input[type=text],input[type=file] { background:var(--card); color:var(--text); border:1px solid var(--border); border-radius:6px; padding:10px 14px; font-size:14px; width:100%; min-width:200px; }
input:focus { outline:none; border-color:var(--accent); }

/* Ad placeholder */
.ad-slot { background:var(--card); border:1px dashed var(--border); border-radius:8px; padding:20px; text-align:center; margin:20px 0; color:var(--muted); font-size:12px; }

/* Breadcrumb */
.breadcrumb { padding:16px 0; font-size:13px; }
.breadcrumb a { color:var(--muted); text-decoration:none; }
.breadcrumb a:hover { color:var(--text); }
.breadcrumb span { color:var(--accent); }

@media (max-width:768px) {
  .hero h1 { font-size:26px; }
  .tools-grid { grid-template-columns:1fr; }
  .tool-wrap { grid-template-columns:1fr; height:auto; }
}