:root {
  --bg:           #0f172a;
  --surface:      #1e293b;
  --surface2:     #273548;
  --border:       #334155;
  --accent:       #6366f1;
  --accent-h:     #818cf8;
  --text:         #f1f5f9;
  --muted:        #94a3b8;
  --green:        #10b981;
  --tag-bg:       #1e3a5f;
  --tag-border:   #2563eb;
  --tag-text:     #93c5fd;
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  min-height: 100vh;
  padding: 2.5rem 1rem 4rem;
}

/* ── Header ── */
header { text-align: center; margin-bottom: 2.5rem; }

.lang-toggle {
  display: flex;
  justify-content: center;
  gap: 0.35rem;
  margin-bottom: 1.25rem;
}

.lang-btn img { vertical-align: middle; margin-right: 0.2rem; }

.lang-btn {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 0.4rem;
  color: var(--muted);
  cursor: pointer;
  font-size: 0.8rem;
  font-weight: 700;
  padding: 0.3rem 0.6rem;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
  letter-spacing: 0.03em;
}

.lang-btn:hover { border-color: var(--accent); color: var(--text); }

.lang-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

h1 {
  font-size: 2.6rem;
  font-weight: 800;
  background: linear-gradient(135deg, #6366f1 0%, #a855f7 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.4rem;
}

.subtitle { color: var(--muted); font-size: 1rem; }

/* ── Cards ── */
.ad-card { padding: 0; overflow: hidden; min-height: 90px; }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 1.5rem;
  max-width: 720px;
  margin: 0 auto 1.5rem;
}

/* ── Form ── */
.form-row {
  display: grid;
  gap: 1rem;
  margin-bottom: 1rem;
}

.form-row.two { grid-template-columns: 1fr 1fr; }

@media (max-width: 480px) {
  .form-row.two { grid-template-columns: 1fr; }
}

.field { display: flex; flex-direction: column; gap: 0.35rem; }

label {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* ── Custom flag select ── */
.custom-select { position: relative; }

.custom-select-trigger {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  color: var(--text);
  font-size: 1rem;
  padding: 0.65rem 0.9rem;
  width: 100%;
  cursor: pointer;
  text-align: left;
  transition: border-color 0.2s;
}

.custom-select-trigger:focus { border-color: var(--accent); outline: none; }
.custom-select.open .custom-select-trigger { border-color: var(--accent); }

.custom-select-label { flex: 1; }

.select-arrow {
  color: var(--muted);
  font-size: 0.75rem;
  transition: transform 0.15s;
  display: inline-block;
}

.custom-select.open .select-arrow { transform: rotate(180deg); }

.custom-select-dropdown {
  display: none;
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  right: 0;
  background: var(--surface2);
  border: 1px solid var(--accent);
  border-radius: 0.5rem;
  overflow: hidden;
  z-index: 100;
}

.custom-select.open .custom-select-dropdown { display: block; }

.custom-option {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: none;
  border: none;
  color: var(--text);
  cursor: pointer;
  font-size: 0.95rem;
  padding: 0.55rem 0.9rem;
  width: 100%;
  text-align: left;
  transition: background 0.12s;
}

.custom-option:hover { background: var(--surface); }
.custom-option.active { background: var(--surface); color: var(--accent); }

input[type="text"], select {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  color: var(--text);
  font-size: 1rem;
  padding: 0.65rem 0.9rem;
  outline: none;
  transition: border-color 0.2s;
  width: 100%;
}

input[type="text"]:focus, select:focus { border-color: var(--accent); }

#letters {
  font-size: 1.5rem;
  letter-spacing: 0.18em;
  font-weight: 700;
  text-transform: uppercase;
}

/* ── Length grid ── */
.length-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.len-btn {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 0.4rem;
  color: var(--muted);
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 600;
  min-width: 2.6rem;
  padding: 0.35rem 0.6rem;
  text-align: center;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
  user-select: none;
}

.len-btn:hover { border-color: var(--accent); color: var(--text); }

.len-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

/* ── Search button ── */
.btn-search {
  background: var(--accent);
  border: none;
  border-radius: 0.5rem;
  color: #fff;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 700;
  padding: 0.8rem 2rem;
  width: 100%;
  transition: background 0.2s, transform 0.1s;
  margin-top: 0.25rem;
}

.btn-search:hover:not(:disabled) { background: var(--accent-h); }
.btn-search:active:not(:disabled) { transform: scale(0.98); }
.btn-search:disabled { opacity: 0.45; cursor: not-allowed; }

/* ── Status / progress ── */
.status-row { min-height: 1.4em; margin-top: 0.75rem; text-align: center; }

.status {
  color: var(--muted);
  font-size: 0.9rem;
}

.status.error { color: #f87171; }

.progress {
  height: 3px;
  background: var(--border);
  border-radius: 2px;
  overflow: hidden;
  margin-top: 0.6rem;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), #a855f7);
  width: 0%;
  transition: width 0.4s ease;
}

.progress-fill.indeterminate {
  width: 40% !important;
  animation: slide 1.4s ease-in-out infinite;
}

@keyframes slide {
  0%   { transform: translateX(-100%); }
  100% { transform: translateX(350%); }
}

/* ── Results ── */
.results-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.1rem;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.results-count { font-weight: 700; color: var(--green); font-size: 1rem; }

.sort-row { display: flex; gap: 0.4rem; }

.sort-btn {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 0.4rem;
  color: var(--muted);
  cursor: pointer;
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.3rem 0.75rem;
  transition: all 0.15s;
}

.sort-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

/* ── Word groups ── */
.group { margin-bottom: 1.2rem; }
.group:last-child { margin-bottom: 0; }

.group-label {
  font-size: 0.75rem;
  font-weight: 800;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.5rem;
}

.words-wrap { display: flex; flex-wrap: wrap; gap: 0.45rem; }

.word-tag {
  background: var(--tag-bg);
  border: 1px solid var(--tag-border);
  border-radius: 0.4rem;
  color: var(--tag-text);
  cursor: default;
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  padding: 0.28rem 0.65rem;
  transition: background 0.15s, color 0.15s;
}

.word-tag:hover {
  background: #1e3a7f;
  color: #bfdbfe;
}

.freq-badge {
  display: inline-block;
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border-radius: 0.25rem;
  padding: 0.1rem 0.3rem;
  margin-left: 0.35rem;
  vertical-align: middle;
  opacity: 0.85;
}

.freq-common   { background: #064e3b; color: #6ee7b7; }
.freq-moderate { background: #78350f; color: #fde68a; }
.freq-rare     { background: #3b1f47; color: #d8b4fe; }

.empty {
  text-align: center;
  color: var(--muted);
  padding: 2rem 0 1rem;
  font-size: 0.95rem;
}