:root {
  --bg: #0b0e14;
  --panel: #141922;
  --panel-raised: #1a212c;
  --border: #232b38;
  --text: #e6eaf0;
  --muted: #8b97a8;
  --amber: #f5a623;
  --amber-dim: #c98a1c;
  --cyan: #4fd1c5;
  --danger: #ef6f6f;
  --mono: 'JetBrains Mono', 'SFMono-Regular', Consolas, Menlo, monospace;
  --sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --radius: 10px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  min-height: 100vh;
}

body {
  background-image:
    radial-gradient(circle at 15% 0%, rgba(245, 166, 35, 0.06), transparent 40%),
    radial-gradient(circle at 85% 100%, rgba(79, 209, 197, 0.05), transparent 40%);
}

a { color: var(--cyan); }

.tape {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 28px;
  overflow: hidden;
  white-space: nowrap;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.3em;
  color: rgba(245, 166, 35, 0.16);
  pointer-events: none;
  user-select: none;
  z-index: 0;
}
.tape span { display: inline-block; animation: scroll-tape 60s linear infinite; }
@keyframes scroll-tape { from { transform: translateX(0); } to { transform: translateX(-50%); } }

.layout {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 160px) minmax(320px, 760px) minmax(0, 160px);
  gap: 24px;
  justify-content: center;
  align-items: start;
  max-width: 1180px;
  margin: 0 auto;
  padding: 48px 20px 64px;
}

.ad-slot {
  position: sticky;
  top: 48px;
  height: 600px;
  width: 160px;
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  background: rgba(255, 255, 255, 0.015);
}

main {
  min-width: 0;
}

header.app-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 28px;
}

.brand .eyebrow {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.25em;
  color: var(--amber);
  text-transform: uppercase;
  margin: 0 0 6px;
}

h1 {
  font-family: var(--mono);
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 0 0 6px;
}

.tagline {
  color: var(--muted);
  margin: 0;
  font-size: 14px;
}

select#langSelect {
  background: var(--panel-raised);
  border: 1px solid var(--border);
  color: var(--text);
  font-family: var(--sans);
  font-size: 13px;
  padding: 8px 10px;
  border-radius: 8px;
  cursor: pointer;
}

.tabs {
  display: flex;
  gap: 4px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 4px;
  margin-bottom: 20px;
  width: fit-content;
}

.tab-btn {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  background: transparent;
  border: none;
  color: var(--muted);
  padding: 9px 18px;
  border-radius: 7px;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}
.tab-btn.active {
  background: var(--amber);
  color: #1a1306;
}

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

.panel { display: none; }
.panel.active { display: block; }

label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 8px;
}

textarea {
  width: 100%;
  min-height: 160px;
  background: #0e1218;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.6;
  padding: 14px;
  resize: vertical;
}
textarea:focus, input:focus, select:focus, .tab-btn:focus-visible, button:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.row {
  display: flex;
  gap: 16px;
  margin-top: 18px;
  flex-wrap: wrap;
}
.field { flex: 1; min-width: 160px; }

.segmented {
  display: flex;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  width: fit-content;
}
.segmented button {
  background: var(--panel-raised);
  border: none;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 13px;
  padding: 9px 16px;
  cursor: pointer;
}
.segmented button + button { border-left: 1px solid var(--border); }
.segmented button.active { background: var(--cyan); color: #06211f; font-weight: 600; }

select, input[type="text"] {
  width: 100%;
  background: #0e1218;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-family: var(--mono);
  font-size: 13px;
  padding: 10px 12px;
}

.primary-btn {
  background: var(--amber);
  color: #1a1306;
  border: none;
  font-family: var(--sans);
  font-weight: 700;
  font-size: 14px;
  padding: 12px 22px;
  border-radius: 8px;
  cursor: pointer;
  margin-top: 18px;
}
.primary-btn:hover { background: #ffb945; }
.primary-btn:disabled { opacity: 0.5; cursor: not-allowed; }

.ghost-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--muted);
  font-family: var(--sans);
  font-size: 13px;
  padding: 12px 16px;
  border-radius: 8px;
  cursor: pointer;
  margin-top: 18px;
  margin-left: 10px;
}
.ghost-btn:hover { color: var(--text); border-color: var(--muted); }

.dropzone {
  border: 1.5px dashed var(--border);
  border-radius: var(--radius);
  padding: 40px 20px;
  text-align: center;
  color: var(--muted);
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}
.dropzone.dragover {
  border-color: var(--amber);
  background: rgba(245, 166, 35, 0.06);
  color: var(--text);
}
.dropzone .drop-icon {
  font-family: var(--mono);
  font-size: 22px;
  color: var(--amber);
  margin-bottom: 10px;
}
.dropzone .or { font-size: 12px; margin: 8px 0; color: var(--muted); }
.dropzone input[type=file] { display: none; }
.browse-btn {
  background: var(--panel-raised);
  border: 1px solid var(--border);
  color: var(--text);
  font-family: var(--sans);
  font-size: 13px;
  padding: 9px 16px;
  border-radius: 8px;
  cursor: pointer;
}

.file-meta {
  margin-top: 14px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--muted);
  display: flex;
  justify-content: space-between;
}

.result-block {
  margin-top: 22px;
  border-top: 1px solid var(--border);
  padding-top: 18px;
}
.result-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}
.result-head label { margin: 0; }
.byte-badge {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--cyan);
}

.copy-btn {
  background: var(--panel-raised);
  border: 1px solid var(--border);
  color: var(--text);
  font-family: var(--sans);
  font-size: 12px;
  padding: 7px 12px;
  border-radius: 7px;
  cursor: pointer;
}
.copy-btn.copied { border-color: var(--cyan); color: var(--cyan); }

.error-box {
  margin-top: 16px;
  border: 1px solid var(--danger);
  background: rgba(239, 111, 111, 0.08);
  color: var(--danger);
  font-size: 13px;
  padding: 10px 14px;
  border-radius: 8px;
  display: none;
}
.error-box.show { display: block; }

footer {
  margin-top: 28px;
  color: var(--muted);
  font-size: 12px;
  text-align: center;
}

@media (max-width: 980px) {
  .layout { grid-template-columns: 1fr; }
  .ad-slot { display: none; }
}