:root {
  color-scheme: light;
  --bg: #f4f6f3;
  --panel: #ffffff;
  --ink: #17201b;
  --muted: #65706b;
  --line: #dce3dd;
  --accent: #0f7b6c;
  --accent-dark: #095b50;
  --gold: #d79a2b;
  --red: #b64235;
  --blue: #315d92;
  --shadow: 0 18px 45px rgba(23, 32, 27, 0.1);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button,
input,
textarea,
select {
  font: inherit;
}

.app-shell {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  background: #16231e;
  color: #eef5f0;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 8px;
  background: var(--accent);
  font-weight: 800;
}

.brand strong,
.brand span {
  display: block;
}

.brand span {
  color: #aebdb6;
  font-size: 13px;
}

.nav-tabs {
  display: grid;
  gap: 8px;
}

.nav-tab {
  border: 0;
  color: #dce8e2;
  background: transparent;
  border-radius: 8px;
  padding: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  text-align: left;
}

.nav-tab span {
  display: grid;
  place-items: center;
  width: 24px;
  height: 24px;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.08);
}

.nav-tab.active,
.nav-tab:hover {
  background: rgba(255, 255, 255, 0.12);
}

.status-panel {
  margin-top: auto;
  border-top: 1px solid rgba(255, 255, 255, 0.16);
  padding-top: 20px;
}

.status-panel h2 {
  font-size: 14px;
  margin: 0 0 14px;
}

.status-panel dl {
  display: grid;
  gap: 12px;
  margin: 0;
}

.status-panel div {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
}

.status-panel dt {
  color: #aebdb6;
  font-size: 13px;
}

.status-panel dd {
  margin: 0;
  font-size: 12px;
  border-radius: 999px;
  padding: 4px 8px;
  background: rgba(255, 255, 255, 0.12);
}

.workspace {
  padding: 28px;
  min-width: 0;
}

.topbar,
.section-heading,
.preview-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.topbar {
  margin-bottom: 24px;
}

.eyebrow {
  margin: 0 0 4px;
  color: var(--accent-dark);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0;
  font-weight: 800;
}

h1,
h2 {
  margin: 0;
  letter-spacing: 0;
}

h1 {
  font-size: 34px;
}

h2 {
  font-size: 20px;
}

.view {
  display: none;
}

.view.active {
  display: block;
}

.conversion-grid {
  display: grid;
  grid-template-columns: minmax(340px, 440px) minmax(0, 1fr);
  gap: 20px;
  align-items: start;
}

.tool-panel,
.preview-panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.tool-panel {
  padding: 18px;
}

.preview-panel {
  min-height: 620px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.segmented {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 4px;
  padding: 4px;
  background: #eef2ef;
  border-radius: 8px;
  margin-bottom: 16px;
}

.segment {
  border: 0;
  border-radius: 6px;
  background: transparent;
  padding: 10px 12px;
  cursor: pointer;
  color: var(--muted);
}

.segment.active {
  background: var(--panel);
  color: var(--ink);
  box-shadow: 0 1px 4px rgba(23, 32, 27, 0.08);
}

.convert-form {
  display: grid;
  gap: 14px;
}

.hidden {
  display: none;
}

.drop-zone {
  border: 1px dashed #a9b8b0;
  border-radius: 8px;
  min-height: 178px;
  display: grid;
  place-items: center;
  text-align: center;
  padding: 18px;
  cursor: pointer;
  background: #fbfcfb;
}

.drop-zone.dragging {
  border-color: var(--accent);
  background: #eef8f5;
}

.drop-zone input {
  position: absolute;
  inline-size: 1px;
  block-size: 1px;
  opacity: 0;
  pointer-events: none;
}

.drop-zone small {
  color: var(--muted);
  max-width: 280px;
  line-height: 1.4;
}

.drop-icon {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 8px;
  background: #e7efe9;
  color: var(--accent-dark);
  font-weight: 800;
}

.file-list {
  display: grid;
  gap: 8px;
  max-height: 120px;
  overflow: auto;
}

.file-pill {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 8px 10px;
  border-radius: 8px;
  background: #f1f4f2;
  font-size: 13px;
}

.primary-action {
  border: 0;
  border-radius: 8px;
  background: var(--accent);
  color: white;
  min-height: 44px;
  padding: 10px 14px;
  cursor: pointer;
  font-weight: 750;
}

.primary-action:hover {
  background: var(--accent-dark);
}

.primary-action:disabled {
  opacity: 0.65;
  cursor: wait;
}

.input-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
}

.field-label {
  display: grid;
  gap: 8px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

input,
textarea,
select {
  border: 1px solid var(--line);
  border-radius: 8px;
  min-height: 42px;
  padding: 10px 12px;
  color: var(--ink);
  background: #fff;
}

textarea {
  resize: vertical;
}

select {
  width: 100%;
}

.options-panel {
  margin-top: 16px;
  border-top: 1px solid var(--line);
  padding-top: 14px;
}

.options-panel summary {
  cursor: pointer;
  font-weight: 800;
}

.option-grid {
  display: grid;
  gap: 14px;
  margin-top: 14px;
}

.switch-row {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--ink);
}

.switch-row input {
  width: 18px;
  height: 18px;
  min-height: 0;
}

.preview-header {
  padding: 18px;
  border-bottom: 1px solid var(--line);
}

.preview-header p {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.batch-selector {
  display: grid;
  gap: 7px;
  padding: 12px 18px;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.batch-selector.hidden {
  display: none;
}

.preview-actions {
  display: flex;
  gap: 8px;
}

.icon-button {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  text-decoration: none;
  cursor: pointer;
  font-weight: 800;
}

.batch-action {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  min-width: 52px;
  height: 40px;
  padding: 0 10px;
  display: grid;
  place-items: center;
  text-decoration: none;
  cursor: pointer;
  font-size: 12px;
  font-weight: 800;
}

.icon-button:hover,
.batch-action:hover {
  border-color: var(--accent);
}

.icon-button.disabled,
.batch-action.disabled {
  opacity: 0.45;
  pointer-events: none;
}

.markdown-output {
  flex: 1;
  margin: 0;
  padding: 18px;
  background: #fbfcfb;
  color: #1c2620;
  overflow: auto;
  white-space: pre-wrap;
  word-break: break-word;
  font-family: "Cascadia Mono", Consolas, "Liberation Mono", monospace;
  font-size: 13px;
  line-height: 1.55;
}

.history-list,
.formats-grid,
.help-layout {
  margin-top: 18px;
  display: grid;
  gap: 12px;
}

.history-item,
.format-card,
.help-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px;
}

.history-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 14px;
  align-items: center;
}

.history-title {
  margin: 0 0 6px;
  font-weight: 800;
  overflow-wrap: anywhere;
}

.history-meta,
.format-card p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}

.status-badge {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: 5px 9px;
  font-size: 12px;
  font-weight: 800;
  background: #e6f3ef;
  color: var(--accent-dark);
}

.status-badge.failed {
  background: #f8e7e4;
  color: var(--red);
}

.format-card strong {
  display: block;
  margin-bottom: 8px;
}

.help-layout {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.help-intro {
  grid-column: 1 / -1;
}

.help-card h3 {
  margin: 0 0 10px;
  font-size: 17px;
}

.help-card p,
.help-card li,
.help-card dd {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.55;
}

.help-card p {
  margin: 0;
}

.help-card p + p {
  margin-top: 10px;
}

.help-card ol,
.help-card ul {
  margin: 0;
  padding-left: 22px;
}

.help-card li + li {
  margin-top: 6px;
}

.help-list {
  display: grid;
  gap: 12px;
  margin: 0;
}

.help-list div {
  border-top: 1px solid var(--line);
  padding-top: 12px;
}

.help-list div:first-child {
  border-top: 0;
  padding-top: 0;
}

.help-list dt {
  font-weight: 800;
  margin-bottom: 4px;
}

.help-list dd {
  margin: 0;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 12px;
}

.tag {
  border-radius: 999px;
  background: #eef2ef;
  color: #33413a;
  padding: 5px 8px;
  font-size: 12px;
  font-weight: 700;
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  transform: translateX(-50%) translateY(24px);
  background: #17201b;
  color: white;
  border-radius: 8px;
  padding: 12px 16px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 160ms ease, transform 160ms ease;
  box-shadow: var(--shadow);
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.app-footer {
  margin-top: 28px;
  padding: 16px 0 4px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 12px;
  text-align: center;
}

@media (max-width: 980px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
    padding: 18px;
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    gap: 16px;
    align-items: center;
  }

  .nav-tabs {
    grid-column: 1 / -1;
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .status-panel {
    grid-column: 1 / -1;
    margin-top: 0;
    padding-top: 14px;
  }

  .status-panel h2 {
    margin-bottom: 10px;
  }

  .status-panel dl {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 8px;
  }

  .status-panel div {
    display: grid;
    gap: 5px;
  }

  .status-panel dd {
    justify-self: start;
  }

  .conversion-grid {
    grid-template-columns: 1fr;
  }

  .help-layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .sidebar {
    padding: 14px;
    gap: 12px;
  }

  .nav-tab {
    min-width: 0;
    padding: 8px 4px;
    flex-direction: column;
    gap: 4px;
    text-align: center;
    font-size: 12px;
  }

  .status-panel {
    padding-top: 10px;
  }

  .status-panel h2 {
    display: none;
  }

  .status-panel dt,
  .status-panel dd {
    font-size: 11px;
  }

  .workspace {
    padding: 18px;
  }

  .topbar,
  .history-item {
    align-items: stretch;
  }

  .topbar,
  .preview-header,
  .history-item {
    flex-direction: column;
  }

  h1 {
    font-size: 28px;
  }

  .input-row {
    grid-template-columns: 1fr;
  }

  .segmented {
    grid-template-columns: repeat(2, 1fr);
  }
}