/* ── Reset / base ────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:        #0f1117;
  --surface:   #1a1d27;
  --border:    #2a2d3d;
  --accent:    #6c63ff;
  --accent-h:  #8a82ff;
  --text:      #e2e4f0;
  --muted:     #7b7f9e;
  --success:   #3ecf8e;
  --danger:    #f87171;
  --radius:    10px;
  --shadow:    0 4px 24px rgba(0,0,0,.4);
}

body {
  font-family: 'Segoe UI', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ── Header ──────────────────────────────────────────────────────────── */
header {
  padding: 2.5rem 2rem 2rem;
  text-align: center;
  border-bottom: 1px solid var(--border);
}
header h1 {
  font-size: 2rem;
  font-weight: 700;
  background: linear-gradient(135deg, #fff 0%, var(--accent-h) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
header p {
  margin-top: .5rem;
  color: var(--muted);
  font-size: .95rem;
}

/* ── Main ────────────────────────────────────────────────────────────── */
main {
  flex: 1;
  max-width: 1100px;
  width: 100%;
  margin: 0 auto;
  padding: 2rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* ── Card ────────────────────────────────────────────────────────────── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem 2rem;
  box-shadow: var(--shadow);
}
.card h2 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
  color: #fff;
}

/* ── File row ────────────────────────────────────────────────────────── */
.file-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
  margin-bottom: 1.5rem;
}

.file-group label {
  display: block;
  font-size: .8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--muted);
  margin-bottom: .5rem;
}
.req { color: var(--danger); }
.opt { color: var(--success); }

/* ── Drop zone ───────────────────────────────────────────────────────── */
.drop-zone {
  position: relative;
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  transition: border-color .2s, background .2s;
}
.drop-zone:hover, .drop-zone.over {
  border-color: var(--accent);
  background: rgba(108,99,255,.06);
}
.drop-zone.loaded {
  border-style: solid;
  border-color: var(--success);
  background: rgba(62,207,142,.05);
}

.drop-zone input[type="file"] {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
  width: 100%;
  height: 100%;
}

.drop-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  padding: 1.4rem 1rem;
  pointer-events: none;
  text-align: center;
}
.drop-inner svg {
  width: 28px;
  height: 28px;
  color: var(--muted);
  transition: color .2s;
}
.drop-zone.loaded .drop-inner svg { color: var(--success); }
.drop-inner span {
  font-size: .82rem;
  color: var(--muted);
  line-height: 1.4;
  word-break: break-all;
}
.drop-inner code {
  background: rgba(255,255,255,.07);
  border-radius: 4px;
  padding: 1px 5px;
  font-size: .78rem;
}

/* ── Target ASN ──────────────────────────────────────────────────────── */
.target-row {
  margin-bottom: 1.25rem;
}
.target-group label {
  display: block;
  font-size: .8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--muted);
  margin-bottom: .5rem;
}
.target-group input[type="number"] {
  width: 240px;
  padding: .6rem .9rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 7px;
  color: var(--text);
  font-size: .95rem;
  outline: none;
  transition: border-color .2s;
}
.target-group input[type="number"]:focus {
  border-color: var(--accent);
}
.target-group input[type="number"]::placeholder {
  color: var(--muted);
}

/* ── Actions ─────────────────────────────────────────────────────────── */
.actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

button {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .65rem 1.6rem;
  background: var(--accent);
  color: #fff;
  font-size: .9rem;
  font-weight: 600;
  border: none;
  border-radius: 7px;
  cursor: pointer;
  transition: background .2s, opacity .2s;
}
button:hover:not(:disabled) { background: var(--accent-h); }
button:disabled { opacity: .4; cursor: not-allowed; }

#status-msg {
  font-size: .85rem;
  color: var(--muted);
}

/* ── Spinner ─────────────────────────────────────────────────────────── */
.spinner {
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255,255,255,.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Stats bar ───────────────────────────────────────────────────────── */
.stats-bar {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-bottom: 1.25rem;
}
.stat-chip {
  background: rgba(108,99,255,.12);
  border: 1px solid rgba(108,99,255,.25);
  border-radius: 999px;
  padding: .35rem .85rem;
  font-size: .82rem;
  color: var(--accent-h);
}
.stat-chip strong { color: #fff; }

/* ── Result actions ──────────────────────────────────────────────────── */
.result-actions {
  margin-bottom: 1rem;
}
#download-btn {
  background: #1e2333;
  border: 1px solid var(--border);
  color: var(--text);
}
#download-btn:hover:not(:disabled) {
  background: #252a3d;
  border-color: var(--accent);
  color: #fff;
}

/* ── Table ───────────────────────────────────────────────────────────── */
.table-wrap { overflow-x: auto; }

.preview-note {
  font-size: .78rem;
  color: var(--muted);
  margin-bottom: .6rem;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: .82rem;
}
th {
  text-align: left;
  padding: .55rem .9rem;
  background: rgba(255,255,255,.04);
  border-bottom: 1px solid var(--border);
  color: var(--muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .05em;
  font-size: .72rem;
}
td {
  padding: .45rem .9rem;
  border-bottom: 1px solid rgba(255,255,255,.04);
  font-family: 'Cascadia Code', 'Consolas', monospace;
}
tr:hover td { background: rgba(255,255,255,.025); }

/* ── Footer ──────────────────────────────────────────────────────────── */
footer {
  text-align: center;
  padding: 1.25rem;
  font-size: .78rem;
  color: var(--muted);
  border-top: 1px solid var(--border);
}

/* ── Utilities ───────────────────────────────────────────────────────── */
.hidden { display: none !important; }