:root {
  --bg: #0b1020;
  --bg-soft: #121933;
  --panel: rgba(18, 25, 51, 0.88);
  --panel-border: rgba(255, 255, 255, 0.08);
  --text: #eef2ff;
  --muted: #9aa6cb;
  --accent: #6d8cff;
  --accent-strong: #4f6ef7;
  --success: #34d399;
  --danger: #f87171;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.35);
  --radius: 18px;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  min-height: 100%;
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(109, 140, 255, 0.22), transparent 28%),
    radial-gradient(circle at top right, rgba(52, 211, 153, 0.12), transparent 24%),
    linear-gradient(180deg, #0b1020 0%, #090d18 100%);
}

code {
  font-family: "SF Mono", Menlo, Monaco, Consolas, monospace;
  font-size: 0.92em;
}

.page {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 32px 0 48px;
}

.hero {
  text-align: center;
  padding: 24px 0 36px;
}

.hero-badge {
  display: inline-block;
  padding: 8px 14px;
  border: 1px solid var(--panel-border);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--muted);
  font-size: 0.85rem;
  margin-bottom: 18px;
}

.hero h1 {
  margin: 0 0 12px;
  font-size: clamp(2rem, 5vw, 3.4rem);
  letter-spacing: -0.04em;
}

.hero-subtitle {
  max-width: 680px;
  margin: 0 auto;
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.7;
}

.workspace {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 20px;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  backdrop-filter: blur(14px);
  overflow: hidden;
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 18px 20px;
  border-bottom: 1px solid var(--panel-border);
}

.panel-header h2 {
  margin: 0;
  font-size: 1rem;
}

.upload-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--panel-border);
  color: var(--text);
  font-size: 0.92rem;
  cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease;
}

.upload-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.16);
}

.upload-btn input {
  display: none;
}

.dropzone {
  min-height: 420px;
  padding: 8px;
}

.dropzone.dragover {
  outline: 2px dashed rgba(109, 140, 255, 0.8);
  outline-offset: -10px;
  background: rgba(109, 140, 255, 0.08);
}

#markdown-input {
  width: 100%;
  min-height: 400px;
  resize: vertical;
  border: 0;
  outline: none;
  padding: 16px;
  background: rgba(0, 0, 0, 0.18);
  color: var(--text);
  border-radius: 14px;
  font-family: "SF Mono", Menlo, Monaco, Consolas, monospace;
  font-size: 0.92rem;
  line-height: 1.65;
}

.panel-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 20px 18px;
  color: var(--muted);
  font-size: 0.88rem;
}

.ghost-btn {
  border: 0;
  background: transparent;
  color: var(--accent);
  cursor: pointer;
  font: inherit;
}

.ghost-btn:hover {
  text-decoration: underline;
}

.action-panel {
  display: flex;
  flex-direction: column;
}

.action-card {
  padding: 20px;
}

.action-card p {
  margin: 0 0 18px;
  color: var(--muted);
  line-height: 1.6;
}

.format-grid {
  display: grid;
  gap: 14px;
}

.convert-btn {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
  width: 100%;
  padding: 18px 18px;
  border-radius: 16px;
  border: 1px solid var(--panel-border);
  background: linear-gradient(180deg, rgba(255,255,255,0.08), rgba(255,255,255,0.03));
  color: var(--text);
  cursor: pointer;
  transition: transform 0.15s ease, border-color 0.15s ease, opacity 0.15s ease;
}

.convert-btn:hover:not(:disabled) {
  transform: translateY(-1px);
  border-color: rgba(109, 140, 255, 0.45);
}

.convert-btn:disabled {
  opacity: 0.6;
  cursor: wait;
}

.format-label {
  font-size: 1.1rem;
  font-weight: 700;
}

.format-desc {
  color: var(--muted);
  font-size: 0.92rem;
}

.pdf-btn .format-label { color: #ffb4b4; }
.docx-btn .format-label { color: #9fd0ff; }

.status {
  min-height: 24px;
  margin-top: 16px;
  font-size: 0.92rem;
}

.status.loading { color: var(--muted); }
.status.success { color: var(--success); }
.status.error { color: var(--danger); }

.features {
  margin-top: auto;
  display: grid;
  gap: 12px;
  padding: 0 20px 20px;
}

.feature {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 16px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--panel-border);
}

.feature span {
  color: var(--muted);
  font-size: 0.88rem;
}

.site-footer {
  margin-top: 28px;
  text-align: center;
  color: var(--muted);
  font-size: 0.9rem;
}

@media (max-width: 900px) {
  .workspace {
    grid-template-columns: 1fr;
  }

  .dropzone,
  #markdown-input {
    min-height: 320px;
  }
}