/* CONVERTER APP PAGE */
.app-main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 48px 24px 80px;
}

.app-header {
  text-align: center;
  margin-bottom: 48px;
}

.app-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text);
  margin-bottom: 12px;
}

.app-subtitle {
  font-size: 1rem;
  color: var(--text-dim);
  max-width: 480px;
  margin: 0 auto;
  line-height: 1.65;
}

/* WORKSPACE */
.converter-workspace {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  align-items: start;
}

.conv-col {
  display: flex;
  flex-direction: column;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
}

.conv-col-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  gap: 12px;
}

.conv-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  white-space: nowrap;
}

.btn-clear {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-dim);
  font-size: 0.75rem;
  font-family: var(--font-body);
  padding: 4px 10px;
  border-radius: 6px;
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s;
}
.btn-clear:hover {
  border-color: rgba(255,255,255,0.18);
  color: var(--text);
}

/* TEXTAREAS */
.conv-textarea {
  width: 100%;
  resize: none;
  border: none;
  outline: none;
  background: transparent;
  font-family: var(--font-body);
  font-size: 0.9rem;
  color: var(--text);
  line-height: 1.65;
  padding: 20px;
}

.conv-textarea::placeholder {
  color: var(--text-dim);
  opacity: 0.5;
}

.conv-textarea--output {
  cursor: default;
  border-top: 1px solid var(--border);
  font-family: 'Courier New', monospace;
  font-size: 0.82rem;
  line-height: 1.6;
  color: var(--text-dim);
  flex: 1;
}

.conv-meta {
  padding: 10px 20px;
  font-size: 0.72rem;
  color: var(--text-dim);
  border-top: 1px solid var(--border);
  letter-spacing: 0.04em;
}

/* TABS */
.output-tabs {
  display: flex;
  gap: 4px;
}

.tab-btn {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-dim);
  font-size: 0.75rem;
  font-family: var(--font-body);
  font-weight: 500;
  padding: 5px 10px;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s;
}

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

.tab-btn.active {
  background: var(--accent-dim);
  color: var(--accent);
  border-color: rgba(245, 158, 11, 0.25);
}

/* OUTPUT FOOTER */
.output-footer {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 20px;
  border-top: 1px solid var(--border);
}

.output-format-label {
  font-size: 0.75rem;
  color: var(--text-dim);
  flex: 1;
}

.btn-copy {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--accent);
  color: #0f0f14;
  border: none;
  font-size: 0.8rem;
  font-weight: 600;
  font-family: var(--font-body);
  padding: 7px 14px;
  border-radius: 8px;
  cursor: pointer;
  transition: opacity 0.15s;
}
.btn-copy:hover { opacity: 0.88; }

/* COPY TOAST */
.copy-toast {
  font-size: 0.72rem;
  color: var(--accent);
  font-weight: 500;
  opacity: 0;
  transition: opacity 0.2s;
}
.copy-toast.visible {
  opacity: 1;
}

/* RESPONSIVE */
@media (max-width: 768px) {
  .converter-workspace {
    grid-template-columns: 1fr;
  }
  .app-main { padding: 32px 16px 60px; }
  .output-tabs { flex-wrap: wrap; }
}