*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --bg: #0a0a1a;
  --bg-card: #111127;
  --bg-input: #1a1a35;
  --border: rgba(255,255,255,0.08);
  --text: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent: #8B5CF6;
  --accent-light: #a78bfa;
  --radius: 12px;
}
html { font-size: 16px; }
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  line-height: 1.6;
}
.container { max-width: 720px; margin: 0 auto; padding: 0 1.25rem; width: 100%; }

.nav {
  display: flex; align-items: center; justify-content: space-between;
  padding: 1rem 0;
}
.nav-brand {
  font-weight: 700; font-size: 1.1rem; color: #fff;
  display: flex; align-items: center; gap: 0.5rem; text-decoration: none;
}
.nav-brand span { background: linear-gradient(135deg, #8B5CF6, #06B6D4); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.nav-back { color: var(--text-muted); font-size: 0.85rem; text-decoration: none; }
.nav-back:hover { color: var(--text-secondary); }
.lang-switch { display: flex; align-items: center; gap: 0.35rem; }
.lang-link {
  font-size: 0.75rem; color: var(--text-muted); text-decoration: none;
  padding: 0.25rem 0.5rem; border-radius: 6px; border: 1px solid transparent;
}
.lang-link:hover { color: var(--text-secondary); }
.lang-link.active {
  color: #fff; background: rgba(139,92,246,0.15);
  border-color: rgba(139,92,246,0.4);
}

.hero { text-align: center; padding: 2rem 0 1.5rem; }
.hero h1 { font-size: 1.6rem; font-weight: 800; margin-bottom: 0.5rem; }
.hero p { color: var(--text-secondary); font-size: 0.9rem; max-width: 480px; margin: 0 auto; }

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1.5rem;
  margin-bottom: 1rem;
}

.input-group { margin-bottom: 1.25rem; }
.input-group:last-child { margin-bottom: 0; }
.input-group label {
  display: block; font-size: 0.8rem; font-weight: 600;
  color: var(--text-secondary); margin-bottom: 0.4rem;
}

select, input[type="number"], input[type="text"], input[type="date"], input[type="password"], textarea {
  width: 100%; padding: 0.75rem 1rem;
  background: var(--bg-input); border: 1px solid var(--border);
  border-radius: var(--radius); color: var(--text);
  font-size: 0.9rem; font-family: inherit;
  transition: border-color 0.3s; appearance: none;
}
select {
  cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%2364748b' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 1rem center; padding-right: 2.5rem;
}
select:focus, input:focus, textarea:focus { outline: none; border-color: var(--accent); }
input[type="number"] { -moz-appearance: textfield; }
input[type="number"]::-webkit-inner-spin-button, input[type="number"]::-webkit-outer-spin-button { -webkit-appearance: none; margin: 0; }
textarea { resize: vertical; min-height: 120px; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.4rem;
  padding: 0.75rem 1.25rem; border-radius: var(--radius);
  font-size: 0.9rem; font-weight: 600; border: none; cursor: pointer;
  background: linear-gradient(135deg, #8B5CF6, #06B6D4); color: #fff;
  transition: opacity 0.2s;
}
.btn:hover { opacity: 0.9; }
.btn-secondary {
  background: rgba(255,255,255,0.06); color: var(--text-secondary);
  border: 1px solid var(--border);
}
.btn-secondary:hover { background: rgba(255,255,255,0.1); color: var(--text); }

.result-box {
  margin-top: 1rem; padding: 1.25rem; border-radius: var(--radius);
  background: rgba(139,92,246,0.08); border: 1px solid rgba(139,92,246,0.25);
  text-align: center;
}
.result-box .result-value { font-size: 1.6rem; font-weight: 800; color: #fff; font-variant-numeric: tabular-nums; }
.result-box .result-label { font-size: 0.8rem; color: var(--text-muted); margin-top: 0.3rem; }

.content-section { margin: 2rem 0; }
.content-section h2 { font-size: 1.15rem; font-weight: 800; color: #fff; margin: 1.75rem 0 0.75rem; }
.content-section h3 { font-size: 0.95rem; font-weight: 700; color: var(--text-secondary); margin: 1.25rem 0 0.4rem; }
.content-section p { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.8; margin-bottom: 0.75rem; }
.content-section ul { font-size: 0.9rem; color: var(--text-secondary); padding-left: 1.25rem; margin-bottom: 0.75rem; }
.content-section li { margin-bottom: 0.4rem; }

.footer {
  margin-top: auto; text-align: center;
  padding: 2rem 0; color: var(--text-muted); font-size: 0.8rem;
}
.footer a { color: var(--text-muted); }
.footer a:hover { color: var(--text-secondary); }

.ad-slot { min-height: 90px; display: flex; align-items: center; justify-content: center; margin: 1rem 0; }

/* Homepage */
.tool-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 1rem; }
.tool-card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: 16px;
  padding: 1.25rem; text-decoration: none; color: var(--text); display: block;
  transition: border-color 0.2s, transform 0.2s;
}
.tool-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.tool-card .tool-icon { font-size: 1.6rem; margin-bottom: 0.6rem; }
.tool-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 0.3rem; }
.tool-card p { font-size: 0.8rem; color: var(--text-muted); }
.tool-card .tool-remove {
  margin-top: 0.6rem; font-size: 0.75rem; color: var(--text-muted); cursor: pointer;
  background: none; border: none; padding: 0; text-decoration: underline;
}
.tool-card .tool-remove:hover { color: #f87171; }

.tool-list { display: flex; flex-direction: column; gap: 0.75rem; }
.tool-list .tool-card { display: flex; align-items: center; gap: 1rem; }
.tool-list .tool-icon { margin-bottom: 0; font-size: 1.4rem; }
.tool-list .tool-card h3 { margin-bottom: 0; }

.tool-compact { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.tool-compact .tool-card { padding: 0.6rem 1rem; display: inline-flex; align-items: center; gap: 0.4rem; }
.tool-compact .tool-icon { margin-bottom: 0; font-size: 1rem; }
.tool-compact p, .tool-compact .tool-btn { display: none; }

.view-controls { display: flex; align-items: center; gap: 0.5rem; margin-bottom: 1.25rem; flex-wrap: wrap; }
.view-controls .btn { padding: 0.5rem 0.9rem; font-size: 0.8rem; }
.view-controls .btn.active { background: linear-gradient(135deg, #8B5CF6, #06B6D4); color: #fff; }
.view-controls .spacer { flex: 1; }
.drag-hint { font-size: 0.75rem; color: var(--text-muted); }

.tool-card.dragging { opacity: 0.4; }
.tool-card.drag-over { border-color: var(--accent); border-style: dashed; }

@media (max-width: 480px) {
  .hero h1 { font-size: 1.3rem; }
  .card { padding: 1.25rem; }
  .tool-grid { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); }
}