:root {
  --bg: #0b0e14;
  --bg-card: #131722;
  --bg-input: #1a1f2e;
  --border: #262c3d;
  --text: #e6e9f0;
  --text-dim: #9aa3b5;
  --accent: #7c5cff;
  --accent-2: #00d4ff;
  --accent-grad: linear-gradient(135deg, #7c5cff, #00d4ff);
  --green: #2dd4a7;
  --radius: 12px;
  --maxw: 960px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

/* Header */
header {
  border-bottom: 1px solid var(--border);
  background: rgba(11, 14, 20, 0.9);
  position: sticky; top: 0; z-index: 10;
  backdrop-filter: blur(8px);
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  height: 60px;
}
.logo {
  font-weight: 800; font-size: 1.15rem; text-decoration: none; color: var(--text);
  display: flex; align-items: center; gap: 8px;
}
.logo .dot {
  width: 22px; height: 22px; border-radius: 6px; background: var(--accent-grad);
  display: inline-block;
}
.nav-links { display: flex; gap: 22px; }
.nav-links a { color: var(--text-dim); text-decoration: none; font-size: 0.92rem; }
.nav-links a:hover, .nav-links a.active { color: var(--text); }

/* Hero */
.hero { text-align: center; padding: 64px 0 40px; }
.hero h1 {
  font-size: clamp(1.8rem, 4.5vw, 2.9rem); font-weight: 800; line-height: 1.2;
  letter-spacing: -0.02em;
}
.hero h1 .grad {
  background: var(--accent-grad);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero p { color: var(--text-dim); max-width: 620px; margin: 16px auto 0; font-size: 1.05rem; }

/* Cards grid */
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 18px; padding: 30px 0 50px; }
.card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 26px; text-decoration: none; color: var(--text);
  transition: transform 0.15s ease, border-color 0.15s ease;
  display: block;
}
.card:hover { transform: translateY(-3px); border-color: var(--accent); }
.card .icon { font-size: 1.8rem; }
.card h3 { margin: 12px 0 6px; font-size: 1.12rem; }
.card p { color: var(--text-dim); font-size: 0.92rem; }
.card .cta { color: var(--accent-2); font-size: 0.88rem; margin-top: 12px; display: inline-block; }

/* Tool layout */
.tool-head { padding: 44px 0 10px; }
.tool-head h1 { font-size: clamp(1.5rem, 3.5vw, 2.2rem); font-weight: 800; letter-spacing: -0.02em; }
.tool-head p.sub { color: var(--text-dim); margin-top: 10px; max-width: 720px; }

.panel {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 26px; margin: 24px 0;
}

.field { margin-bottom: 16px; }
.field label { display: block; font-size: 0.85rem; color: var(--text-dim); margin-bottom: 6px; font-weight: 600; }
.field input[type="text"], .field input[type="number"], .field select, .field textarea {
  width: 100%; background: var(--bg-input); border: 1px solid var(--border); color: var(--text);
  border-radius: 8px; padding: 10px 12px; font-size: 0.95rem; font-family: inherit;
}
.field input:focus, .field select:focus, .field textarea:focus { outline: none; border-color: var(--accent); }
.field textarea { resize: vertical; min-height: 70px; }

.row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.row-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 14px; }
@media (max-width: 640px) { .row, .row-3 { grid-template-columns: 1fr; } }

.btn {
  background: var(--accent-grad); color: #fff; border: none; border-radius: 8px;
  padding: 12px 22px; font-size: 0.98rem; font-weight: 700; cursor: pointer;
  font-family: inherit;
}
.btn:hover { opacity: 0.9; }
.btn-ghost {
  background: transparent; border: 1px solid var(--border); color: var(--text);
  border-radius: 8px; padding: 12px 18px; font-size: 0.95rem; cursor: pointer; font-family: inherit;
}
.btn-ghost:hover { border-color: var(--accent-2); color: var(--accent-2); }
.btn-row { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 6px; }

.output {
  background: var(--bg-input); border: 1px solid var(--border); border-radius: 8px;
  padding: 16px; margin-top: 18px; white-space: pre-wrap; font-size: 0.95rem;
  min-height: 90px; color: var(--text);
}
.tip {
  border-left: 3px solid var(--accent-2); background: rgba(0, 212, 255, 0.06);
  padding: 10px 14px; border-radius: 0 8px 8px 0; font-size: 0.88rem; color: var(--text-dim);
  margin-top: 14px;
}
.copied { color: var(--green); font-size: 0.88rem; margin-left: 10px; }

/* Tables */
table { width: 100%; border-collapse: collapse; margin-top: 14px; font-size: 0.93rem; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--border); }
th { color: var(--text-dim); font-size: 0.82rem; text-transform: uppercase; letter-spacing: 0.04em; }
tr.best td { color: var(--green); font-weight: 700; }
.table-wrap { overflow-x: auto; }
a.try {
  color: var(--accent-2); text-decoration: none; font-weight: 700; font-size: 0.88rem;
  border: 1px solid var(--border); border-radius: 999px; padding: 4px 12px; white-space: nowrap;
}
a.try:hover { border-color: var(--accent-2); }

/* Presets */
.preset-row { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 18px; }
.preset {
  background: var(--bg-input); border: 1px solid var(--border); color: var(--text-dim);
  border-radius: 999px; padding: 7px 16px; font-size: 0.86rem; cursor: pointer; font-family: inherit;
}
.preset:hover, .preset.active { border-color: var(--accent); color: var(--text); }

/* SEO content */
.content { padding: 20px 0 40px; max-width: 760px; }
.content h2 { font-size: 1.35rem; margin: 30px 0 10px; }
.content h3 { font-size: 1.05rem; margin: 20px 0 6px; }
.content p, .content li { color: var(--text-dim); font-size: 0.96rem; }
.content ul, .content ol { padding-left: 22px; margin: 8px 0; }
.content a { color: var(--accent-2); }

/* FAQ */
.faq details {
  border: 1px solid var(--border); border-radius: 8px; padding: 14px 18px; margin-bottom: 10px;
  background: var(--bg-card);
}
.faq summary { cursor: pointer; font-weight: 600; color: var(--text); }
.faq details p { margin-top: 10px; }

/* Footer */
footer { border-top: 1px solid var(--border); padding: 30px 0; margin-top: 40px; }
.footer-inner {
  display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 14px;
  color: var(--text-dim); font-size: 0.88rem;
}
.footer-inner a { color: var(--text-dim); text-decoration: none; margin-right: 16px; }
.footer-inner a:hover { color: var(--text); }

.badge {
  display: inline-block; background: rgba(124, 92, 255, 0.15); color: var(--accent);
  font-size: 0.75rem; font-weight: 700; padding: 3px 10px; border-radius: 999px;
  margin-bottom: 14px; letter-spacing: 0.03em;
}