:root {
  --bg: #0b0f14;
  --surface: #111720;
  --surface-2: #0e141c;
  --text: #e6edf3;
  --text-muted: #a9b5c2;
  --brand: #8b5cf6; /* indigo/violet – more harmonious */
  --brand-strong: #7c3aed;
  --accent: #22c55e;
  --warning: #f59e0b;
  --danger: #ef4444;
  --border: #1e293b;
  --shadow: 0 10px 30px rgba(0,0,0,.35);
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f7f9fc;
    --surface: #ffffff;
    --surface-2: #f3f6fb;
    --text: #0b1220;
    --text-muted: #50627a;
    --brand: #7c3aed;
    --brand-strong: #6d28d9;
    --accent: #16a34a;
    --warning: #d97706;
    --danger: #dc2626;
    --border: #e5e9f0;
    --shadow: 0 10px 30px rgba(2,6,23,.08);
  }
}

* { box-sizing: border-box; }
html, body { height: 100%; }
html { background: var(--bg); }
body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  color: var(--text);
  background: var(--bg);
  line-height: 1.5;
  min-height: 100vh;
  position: relative;
  /* Ensure the fixed background layer stays behind content consistently */
  isolation: isolate;
}

/* Fixed background layer to avoid banding when content grows */
body::before {
  content: "";
  position: fixed;
  /* Slightly oversize to avoid any device-pixel seams */
  inset: -25vh -25vw;
  pointer-events: none;
  z-index: -1;
  background: radial-gradient(1600px 1200px at 10% -10%, rgba(107,114,128,.25), var(--bg) 60%),
              radial-gradient(1600px 1000px at 110% 10%, rgba(59,130,246,.18), var(--bg) 55%);
}

/* Ensure footer never reveals a different page background */
.app-footer { background: transparent; }

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 20px;
}

.app-header {
  padding: 48px 0 24px;
}

.brand {
  margin: 0;
  font-weight: 700;
  letter-spacing: -0.02em;
  font-size: 32px;
}

.subtitle {
  margin: 10px 0 0;
  color: var(--text-muted);
  font-size: 16px;
}

/* Hero container for title + subtitle */
.hero-panel {
  text-align: center;
  margin: 0 auto;
  max-width: 860px;
  padding: 28px 26px;
  background: linear-gradient(180deg, var(--surface), var(--surface-2));
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow);
}

main.container {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  padding-bottom: 48px;
}

.panel {
  background: linear-gradient(180deg, var(--surface), var(--surface-2));
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.panel-header {
  padding: 18px 20px 0;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}
.panel-header .header-text { flex: 1; min-width: 0; }
.panel-header h2 {
  margin: 16px 0 2px;
  font-size: 18px;
}
.panel-header p {
  margin: 0 0 12px;
  color: var(--text-muted);
  font-size: 14px;
}

.dropzone {
  position: relative;
  margin: 18px;
  padding: 24px;
  border: 1.5px dashed #2b3a52;
  border-radius: 12px;
  background: rgba(59, 130, 246, 0.06);
  transition: transform .12s ease, border-color .2s ease, background .2s ease;
  cursor: pointer;
}
.dropzone:hover { transform: translateY(-1px); }
.dropzone.dragover {
  background: rgba(59, 130, 246, 0.12);
  border-color: var(--brand);
}
.file-input {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}
.dropzone-inner {
  display: flex;
  align-items: center;
  gap: 14px;
  color: var(--text-muted);
}
.dz-icon { font-size: 32px; }
.dz-title { font-weight: 600; color: var(--text); }
.dz-sub { font-size: 12px; }

.or-divider {
  display: flex; align-items: center; gap: 12px; margin: 6px 18px 12px;
  color: var(--text-muted);
}
.or-divider::before, .or-divider::after {
  content: ""; flex: 1; height: 1px; background: var(--border);
}
.or-divider span { font-size: 12px; padding: 2px 8px; border-radius: 999px; background: rgba(148,163,184,.08); }

.paste-label { margin: 0 18px 6px; display: block; color: var(--text-muted); font-size: 13px; }
.textarea {
  margin: 0 18px 16px;
  width: calc(100% - 36px);
  resize: vertical;
  min-height: 120px;
  padding: 12px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: #0a0f16;
  color: #dbe7f3;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: 13px;
  line-height: 1.6;
}

.status {
  margin: 0 18px 8px;
  padding: 10px 12px;
  border-radius: 10px;
  background: rgba(148, 163, 184, 0.08);
  color: var(--text);
  font-size: 14px;
  min-height: 40px;
  display: flex;
  align-items: center;
}
.status .ok { color: var(--accent); font-weight: 600; margin-right: 8px; }
.status .warn { color: var(--warning); font-weight: 600; margin-right: 8px; }
.status .err { color: var(--danger); font-weight: 600; margin-right: 8px; }

.file-meta {
  margin: 0 18px 12px;
  color: var(--text-muted);
  font-size: 13px;
}
.file-meta .meta-label { color: var(--text); font-weight: 600; margin-right: 6px; }

.actions {
  display: flex;
  gap: 10px;
  padding: 0 18px 18px;
  flex-wrap: wrap;
  align-items: center;
}
/* Row for download + name */
.download-row { display: flex; gap: 10px; align-items: center; width: 100%; padding-top: 8px; min-height: 44px; }
/* New container after re-add */
.download-area { display: flex; gap: 10px; align-items: center; width: 100%; padding-top: 8px; min-height: 44px; flex-wrap: wrap; }

.btn {
  appearance: none;
  border: 1px solid transparent;
  background: var(--surface-2);
  color: var(--text);
  padding: 10px 14px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 14px;
  cursor: pointer;
  transition: transform .08s ease, background .2s ease, border-color .2s ease;
  text-decoration: none; /* remove link underline for anchor buttons */
}
.btn-lg { padding: 12px 18px; font-size: 15px; }
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0px) scale(.99); }
.btn-primary { background: var(--brand); color: white; }
.btn-primary:hover { background: var(--brand-strong); }
.btn-secondary { border-color: #2b3a52; }
.btn-danger { background: rgb(49, 5, 4); color: #fff; border-color: #260403; }
.btn-danger:hover { background: rgb(64, 8, 7); border-color: #2e0504; }
.btn-metal { background: rgb(29, 73, 73); color: #fff; border-color: rgb(16, 40, 40); text-decoration: none; }
.btn-metal:hover { background: rgb(24, 60, 60); border-color: rgb(14, 34, 34); text-decoration: none; }
.btn[disabled] { opacity: .6; cursor: not-allowed; }
.hidden { display: none !important; }

.btn-sm { padding: 8px 10px; font-size: 12.5px; border-radius: 8px; }

/* Red-Black toggle switch */
.switch-wrap { display: inline-flex; align-items: center; gap: 8px; margin-left: 6px; }
.switch-label { font-size: 13px; color: var(--text); opacity: .9; }
.switch { position: relative; display: inline-block; width: 48px; height: 28px; }
.switch input { opacity: 0; width: 0; height: 0; }
.switch .slider {
  position: absolute; cursor: pointer; inset: 0; background: #0f141d; border: 1px solid #202a3a;
  transition: background .2s ease; border-radius: 999px;
}
.switch .slider::before {
  content: ""; position: absolute; height: 20px; width: 20px; left: 3px; top: 3px; background: #fff; border-radius: 50%; transition: transform .2s ease;
}
.switch input:checked + .slider { background: #7f1d1d; border-color: #5f1515; }
.switch input:checked + .slider::before { transform: translateX(20px); }

.output-name { display: grid; grid-template-columns: max-content minmax(200px, 1fr); column-gap: 10px; align-items: center; flex: 1 1 320px; min-width: 0; }
.output-name label { font-size: 13px; color: var(--text-muted); white-space: nowrap; }
.text-input {
  background: var(--surface-2);
  border: 1px solid #2b3a52;
  color: var(--text);
  padding: 9px 10px;
  border-radius: 8px;
  font-size: 14px;
  min-width: 220px;
}
/* Allow the file name input to shrink and fill available space */
.output-name .text-input { flex: 1 1 auto; width: 100%; min-width: 0; }

/* Stack controls on narrow screens for clean wrapping */
@media (max-width: 520px) {
  .download-area { gap: 8px; }
  .download-area .btn { width: 100%; }
  /* Keep label + input side-by-side but ensure clean alignment */
  .output-name { gap: 8px; flex-basis: 100%; }
  /* Subtle optical alignment nudge so label centers with the input */
  .output-name label { position: relative; top: 2px; }
}

.preview {
  margin: 0 18px 18px;
  padding: 14px 16px;
  background: #0a0f16;
  color: #dbe7f3;
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: auto;
  max-height: 420px;
  line-height: 1.6;
  font-size: 13px;
}
.preview-wrap { position: relative; }
.preview-controls { display: flex; gap: 8px; }
.metrics-bar {
  margin: 6px 18px 18px;
  color: var(--text-muted);
  font-size: 12px;
  background: rgba(148,163,184,.08);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 6px 10px;
  white-space: pre; /* keep spacing between columns */
  display: flex;
  align-items: center;
  width: fit-content;
}
@media (prefers-color-scheme: light) {
  .preview { background: #0b1220; color: #dbe7f3; }
}

.app-footer {
  padding: 18px 0 42px;
  color: var(--text-muted);
  text-align: center;
}
/* Stack footer notes cleanly and style links subtly */
.app-footer small { display: block; margin-top: 6px; }
.app-footer a { color: var(--text-muted); text-decoration: underline; text-underline-offset: 2px; }
.app-footer a:hover { color: var(--text); }