:root {
  --bg: #0f172a;
  --card-bg: #1e293b;
  --accent: #38bdf8;
  --accent-hover: #0284c7;
  --text: #f8fafc;
  --text-muted: #94a3b8;
  --border: #334155;
  --success: #22c55e;
  --danger: #f87171;
}

* { box-sizing: border-box; margin: 0; padding: 0; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; }
[hidden] { display: none !important; }
body { background-color: var(--bg); color: var(--text); line-height: 1.6; display: flex; flex-direction: column; min-height: 100vh; }

header { border-bottom: 1px solid var(--border); padding: 1rem 2rem; display: flex; justify-content: space-between; align-items: center; gap: .75rem; flex-wrap: wrap; background: rgba(15, 23, 42, 0.9); backdrop-filter: blur(8px); position: sticky; top: 0; z-index: 50; }
.logo { font-size: 1.5rem; font-weight: 800; color: var(--text); text-decoration: none; }
.logo span { color: var(--accent); }
.badge-privacy { background: rgba(34,197,94,.1); color: var(--success); border: 1px solid rgba(34,197,94,.2); padding: .25rem .75rem; border-radius: 9999px; font-size: .85rem; font-weight: 600; }

main { flex: 1; max-width: 1000px; width: 100%; margin: 2rem auto; padding: 0 1rem; }
.hero { text-align: center; margin-bottom: 2.5rem; }
.hero h1 { font-size: clamp(1.8rem, 5vw, 2.5rem); font-weight: 800; margin-bottom: .5rem; }
.hero p { color: var(--text-muted); font-size: 1.1rem; }

.tabs { display: flex; gap: .5rem; margin-bottom: 1.5rem; border-bottom: 1px solid var(--border); padding-bottom: .5rem; overflow-x: auto; }
.tab-btn { background: none; border: none; color: var(--text-muted); padding: .75rem 1.25rem; font-weight: 600; font-size: 1rem; cursor: pointer; border-radius: .5rem; transition: all .2s; white-space: nowrap; }
.tab-btn:hover { color: var(--text); background: var(--card-bg); }
.tab-btn.active { color: var(--accent); background: var(--card-bg); }

.tool-card { background: var(--card-bg); border: 1px solid var(--border); border-radius: 1rem; padding: 2rem; display: none; }
.tool-card.active { display: block; }
.tool-card h2 { margin-bottom: .25rem; }
.muted { color: var(--text-muted); margin-bottom: 1.5rem; }
.result .muted { margin-bottom: 1rem; }

.options { display: flex; gap: 1.5rem; flex-wrap: wrap; margin-bottom: 1.25rem; color: var(--text-muted); font-size: .95rem; }
.options label { display: flex; align-items: center; gap: .5rem; }
select { background: var(--bg); color: var(--text); border: 1px solid var(--border); border-radius: .4rem; padding: .35rem .6rem; font-size: .95rem; }
input[type=range] { accent-color: var(--accent); }

.drop-zone { border: 2px dashed var(--border); border-radius: .75rem; padding: 3rem 1.5rem; text-align: center; cursor: pointer; transition: border-color .2s, background-color .2s; }
.drop-zone:hover, .drop-zone:focus-visible, .drop-zone.dragover { border-color: var(--accent); background: rgba(56,189,248,.05); outline: none; }
.drop-zone p { color: var(--text-muted); margin-top: .5rem; }

.btn { display: inline-block; background: var(--accent); color: #000; font-weight: 700; font-size: 1rem; text-decoration: none; padding: .75rem 1.5rem; border: none; border-radius: .5rem; cursor: pointer; transition: background .2s; margin-top: 1rem; }
.btn:hover { background: var(--accent-hover); color: #fff; }
.btn-secondary { background: transparent; color: var(--text); border: 1px solid var(--border); }
.btn-secondary:hover { background: var(--bg); color: var(--accent); }
.actions { display: flex; gap: .75rem; flex-wrap: wrap; }

textarea { width: 100%; height: 240px; background: var(--bg); color: var(--text); border: 1px solid var(--border); border-radius: .5rem; padding: 1rem; font-family: ui-monospace, Menlo, Consolas, monospace; font-size: .9rem; resize: vertical; }
textarea:focus { outline: 2px solid var(--accent); outline-offset: 1px; }

.result { margin-top: 1.5rem; text-align: center; }
#canvas-preview { max-width: 100%; max-height: 300px; border-radius: .5rem; margin-bottom: 1rem; background: repeating-conic-gradient(#273449 0% 25%, #1e293b 0% 50%) 50% / 20px 20px; }
.error { color: var(--danger); margin-top: .75rem; }
.success { color: var(--success); }

footer { border-top: 1px solid var(--border); padding: 2rem; text-align: center; color: var(--text-muted); font-size: .9rem; margin-top: auto; }

@media (max-width: 600px) {
  header { padding: 1rem; }
  .tool-card { padding: 1.25rem; }
  .drop-zone { padding: 2rem 1rem; }
}