:root {
  --bg: #0b1220;
  --bg-card: #121a2b;
  --bg-elevated: #1a2438;
  --border: #2a3650;
  --text: #e8eef8;
  --text-muted: #9aacc8;
  --accent: #3dd68c;
  --accent-dim: #2a9d66;
  --accent-glow: rgba(61, 214, 140, 0.25);
  --warn: #f5a623;
  --danger: #f07178;
  --info: #61afef;
  --radius: 12px;
  --shadow: 0 8px 32px rgba(0,0,0,0.35);
  --font: 'Inter', system-ui, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
main { flex: 1; max-width: 1200px; margin: 0 auto; padding: 1.5rem 1.25rem 3rem; width: 100%; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Header */
header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(11, 18, 32, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  max-width: 1200px; margin: 0 auto; padding: 0.85rem 1.25rem;
  display: flex; align-items: center; justify-content: space-between; gap: 1rem; flex-wrap: wrap;
}
.logo {
  display: flex; align-items: center; gap: 0.65rem;
  font-weight: 700; font-size: 1.15rem; color: var(--text); text-decoration: none;
}
.logo-icon {
  width: 36px; height: 36px;
  background: linear-gradient(135deg, var(--accent), #1e8f5e);
  border-radius: 8px; display: grid; place-items: center; font-size: 1.1rem;
}
nav { display: flex; flex-wrap: wrap; gap: 0.25rem; }
nav a {
  color: var(--text-muted); padding: 0.4rem 0.7rem; border-radius: 8px;
  font-size: 0.875rem; font-weight: 500; text-decoration: none; transition: all 0.15s;
}
nav a:hover, nav a.active {
  color: var(--accent); background: var(--accent-glow); text-decoration: none;
}

/* Hero */
.hero { text-align: center; padding: 1.5rem 0 1rem; }
.hero h1 {
  font-size: clamp(1.6rem, 4vw, 2.3rem); margin-bottom: 0.5rem;
  background: linear-gradient(90deg, #fff, var(--accent));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.hero p { color: var(--text-muted); max-width: 640px; margin: 0 auto 1rem; }
.badge-row { display: flex; flex-wrap: wrap; gap: 0.45rem; justify-content: center; }
.badge {
  background: var(--bg-elevated); border: 1px solid var(--border);
  padding: 0.28rem 0.7rem; border-radius: 999px; font-size: 0.78rem; color: var(--text-muted);
}

/* Sections & cards */
section { margin-bottom: 2.25rem; scroll-margin-top: 80px; }
.section-title {
  font-size: 1.3rem; margin-bottom: 1rem;
  display: flex; align-items: center; gap: 0.5rem;
}
.section-title span { color: var(--accent); }
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.15rem;
}
.card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.2rem; box-shadow: var(--shadow);
  transition: border-color 0.2s;
}
.card:hover { border-color: var(--accent-dim); }
.card h3 {
  font-size: 1.02rem; margin-bottom: 0.3rem;
  display: flex; align-items: center; gap: 0.4rem;
}
.card .desc { color: var(--text-muted); font-size: 0.84rem; margin-bottom: 0.9rem; }

label {
  display: block; font-size: 0.78rem; color: var(--text-muted);
  margin-bottom: 0.22rem; font-weight: 500;
}
input, select, textarea {
  width: 100%; background: var(--bg); border: 1px solid var(--border);
  color: var(--text); padding: 0.52rem 0.7rem; border-radius: 8px;
  font-family: var(--font); font-size: 0.92rem; margin-bottom: 0.7rem;
  transition: border-color 0.15s;
}
input:focus, select:focus, textarea:focus {
  outline: none; border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}
textarea { resize: vertical; min-height: 80px; }
.row { display: grid; grid-template-columns: 1fr 1fr; gap: 0.7rem; }
@media (max-width: 520px) { .row { grid-template-columns: 1fr; } }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.35rem;
  background: var(--accent); color: #0b1220; border: none;
  padding: 0.52rem 1rem; border-radius: 8px; font-weight: 600;
  font-size: 0.88rem; cursor: pointer; transition: background 0.15s, transform 0.1s;
  font-family: var(--font); text-decoration: none;
}
.btn:hover { background: #4ae89a; text-decoration: none; color: #0b1220; }
.btn:active { transform: scale(0.98); }
.btn-secondary {
  background: var(--bg-elevated); color: var(--text); border: 1px solid var(--border);
}
.btn-secondary:hover { background: var(--border); color: var(--text); }
.btn-danger {
  background: transparent; color: var(--danger); border: 1px solid var(--danger);
}
.btn-danger:hover { background: rgba(240,113,120,0.15); }
.btn-sm { padding: 0.32rem 0.65rem; font-size: 0.78rem; }
.btn-group { display: flex; flex-wrap: wrap; gap: 0.45rem; margin-top: 0.4rem; }

.result {
  background: var(--bg); border: 1px solid var(--border); border-radius: 8px;
  padding: 0.8rem 0.95rem; margin-top: 0.45rem;
  font-family: var(--mono); font-size: 0.88rem; line-height: 1.55;
}
.result strong { color: var(--accent); }
.result .unit { color: var(--text-muted); font-size: 0.85em; }

.note { font-size: 0.78rem; color: var(--text-muted); margin-top: 0.45rem; line-height: 1.4; }
.warn-note {
  background: rgba(245,166,35,0.1); border: 1px solid rgba(245,166,35,0.3);
  border-radius: 8px; padding: 0.6rem 0.8rem; font-size: 0.8rem; color: var(--warn); margin-top: 0.7rem;
}

/* Tables */
.table-wrap { overflow-x: auto; margin-top: 0.9rem; border-radius: 8px; border: 1px solid var(--border); }
table { width: 100%; border-collapse: collapse; font-size: 0.88rem; }
th, td { padding: 0.55rem 0.8rem; text-align: left; border-bottom: 1px solid var(--border); }
th {
  background: var(--bg-elevated); color: var(--text-muted); font-weight: 600;
  font-size: 0.76rem; text-transform: uppercase; letter-spacing: 0.03em;
}
tr:last-child td { border-bottom: none; }
tr:hover td { background: rgba(61,214,140,0.04); }
.empty-state { text-align: center; color: var(--text-muted); padding: 1.4rem; font-size: 0.88rem; }

/* Band plan tables */
.freq-table td:first-child, .freq-table th:first-child { font-family: var(--mono); }
.freq-table .ch { font-weight: 600; color: var(--accent); }
.copy-btn {
  background: transparent; border: 1px solid var(--border); color: var(--text-muted);
  padding: 0.15rem 0.4rem; border-radius: 4px; font-size: 0.7rem; cursor: pointer;
}
.copy-btn:hover { border-color: var(--accent); color: var(--accent); }

/* Listings */
.listings { display: grid; gap: 0.7rem; margin-top: 0.9rem; }
.listing {
  background: var(--bg); border: 1px solid var(--border); border-radius: 8px;
  padding: 0.8rem 1rem; display: flex; justify-content: space-between;
  align-items: flex-start; gap: 1rem;
}
.listing-info h4 { font-size: 0.95rem; margin-bottom: 0.15rem; }
.listing-meta { font-size: 0.78rem; color: var(--text-muted); }
.price { font-weight: 700; color: var(--accent); font-family: var(--mono); white-space: nowrap; }

/* Socials */
.socials { display: flex; flex-wrap: wrap; gap: 0.7rem; }
.social-btn {
  display: inline-flex; align-items: center; gap: 0.45rem;
  background: var(--bg-card); border: 1px solid var(--border);
  padding: 0.65rem 1.1rem; border-radius: 10px; color: var(--text);
  font-weight: 500; transition: all 0.15s; text-decoration: none;
}
.social-btn:hover {
  border-color: var(--accent); background: var(--accent-glow);
  text-decoration: none; color: var(--accent);
}

/* Tabs */
.tabs { display: flex; gap: 0.25rem; margin-bottom: 0.9rem; flex-wrap: wrap; }
.tab {
  background: transparent; border: 1px solid var(--border); color: var(--text-muted);
  padding: 0.32rem 0.65rem; border-radius: 6px; font-size: 0.78rem;
  cursor: pointer; font-family: var(--font);
}
.tab.active {
  background: var(--accent-glow); border-color: var(--accent); color: var(--accent);
}

/* PTT */
.ptt-btn {
  width: 130px; height: 130px; border-radius: 50%; font-size: 1.3rem;
  touch-action: none; user-select: none; border: none; cursor: pointer;
  background: var(--accent); color: #0b1220; font-weight: 700;
  box-shadow: 0 0 0 6px var(--accent-glow);
  transition: background 0.1s, transform 0.1s;
}
.ptt-btn.active { background: var(--danger); transform: scale(1.05); }
.level-bar {
  height: 12px; background: var(--bg); border-radius: 6px; overflow: hidden;
  border: 1px solid var(--border); width: 100%; max-width: 260px;
}
.level-fill { height: 100%; width: 0%; background: var(--accent); transition: width 0.05s; }

/* Footer */
footer {
  border-top: 1px solid var(--border); padding: 1.4rem 1.25rem;
  text-align: center; color: var(--text-muted); font-size: 0.84rem;
}
footer a { color: var(--accent); }

.hidden { display: none !important; }

/* Feature grid on home */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}
.feature-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.1rem; text-decoration: none; color: inherit;
  transition: border-color 0.2s, transform 0.15s;
}
.feature-card:hover {
  border-color: var(--accent); transform: translateY(-2px); text-decoration: none; color: inherit;
}
.feature-card h3 { color: var(--accent); margin-bottom: 0.3rem; font-size: 1rem; }
.feature-card p { color: var(--text-muted); font-size: 0.84rem; }

/* Tone grid */
.tone-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(90px, 1fr));
  gap: 0.4rem;
  margin-top: 0.5rem;
}
.tone-chip {
  background: var(--bg); border: 1px solid var(--border); border-radius: 6px;
  padding: 0.35rem 0.4rem; text-align: center; font-family: var(--mono);
  font-size: 0.8rem; cursor: pointer; transition: all 0.15s;
}
.tone-chip:hover, .tone-chip.common {
  border-color: var(--accent); background: var(--accent-glow); color: var(--accent);
}
.tone-chip.common { font-weight: 600; }