:root {
  --paper: #f7f4ed;
  --ink: #20252b;
  --muted: #657078;
  --line: #d7ddd8;
  --panel: #ffffff;
  --teal: #165f5a;
  --teal-dark: #0f403d;
  --coral: #c94f35;
  --gold: #e2b84b;
  --blue: #2f6f9f;
  --shadow: 0 24px 80px rgba(25, 35, 40, 0.14);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(135deg, rgba(22, 95, 90, 0.11), transparent 32%),
    linear-gradient(315deg, rgba(201, 79, 53, 0.12), transparent 34%),
    var(--paper);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans Thai", sans-serif;
  line-height: 1.5;
}

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

.app-shell {
  width: min(1440px, 100%);
  min-height: 100vh;
  margin: 0 auto;
  padding: 16px;
}

.intro-panel {
  display: grid;
  grid-template-columns: minmax(270px, 0.78fr) minmax(260px, 1fr) minmax(360px, 1fr);
  gap: 16px;
  align-items: center;
  margin-bottom: 16px;
  padding: 12px 14px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid rgba(255, 255, 255, 0.75);
  box-shadow: var(--shadow);
}

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

.book-lockup img {
  width: 58px;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  box-shadow: 0 14px 28px rgba(28, 25, 22, 0.22);
}

.eyebrow,
.section-kicker {
  margin: 0 0 6px;
  color: var(--coral);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2 {
  margin: 0;
  line-height: 1.08;
  letter-spacing: 0;
}

h1 {
  font-size: clamp(1.45rem, 2.4vw, 2.25rem);
}

h2 {
  font-size: 1.35rem;
}

.intro-copy {
  margin: 0;
  max-width: 52ch;
  color: #3d474d;
  font-size: 0.98rem;
}

.intro-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

.loop-strip {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 8px;
}

.method-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 6px;
}

.loop-strip span,
.method-strip span {
  min-height: 34px;
  display: grid;
  place-items: center;
  padding: 6px 8px;
  color: var(--teal-dark);
  background: #e6f1ee;
  border: 1px solid #c9ddd8;
  font-weight: 800;
  font-size: 0.88rem;
  text-align: center;
}

.method-strip span {
  color: #3c3640;
  background: #f8eee7;
  border-color: #ead3c7;
}

.workspace {
  --left-pane: 42%;
  display: grid;
  grid-template-columns: minmax(320px, var(--left-pane)) 12px minmax(420px, 1fr);
  gap: 0;
  align-items: start;
}

.workspace-resizer {
  width: 12px;
  min-height: 720px;
  cursor: col-resize;
  position: relative;
  align-self: stretch;
}

.workspace-resizer::before {
  content: "";
  position: absolute;
  inset: 0 5px;
  background: rgba(22, 95, 90, 0.18);
}

.workspace-resizer::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 4px;
  height: 48px;
  transform: translate(-50%, -50%);
  border-left: 1px solid var(--teal);
  border-right: 1px solid var(--teal);
  opacity: 0.65;
}

.workspace-resizer:hover::before,
.workspace-resizer:focus-visible::before,
.workspace-resizer.is-dragging::before {
  background: rgba(22, 95, 90, 0.34);
}

.workspace-resizer:focus-visible {
  outline: 3px solid rgba(47, 111, 159, 0.28);
  outline-offset: 2px;
}

body.is-resizing {
  cursor: col-resize;
  user-select: none;
}

.input-panel,
.output-panel {
  background: var(--panel);
  border: 1px solid rgba(215, 221, 216, 0.94);
  box-shadow: var(--shadow);
}

.input-panel {
  display: grid;
  gap: 18px;
  padding: 22px;
}

.output-panel {
  min-height: 720px;
  padding: 22px;
}

.topbar,
.output-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: start;
  gap: 16px;
}

.language-toggle {
  display: grid;
  grid-template-columns: repeat(2, 48px);
  border: 1px solid var(--line);
}

.lang-btn {
  height: 38px;
  border: 0;
  color: var(--muted);
  background: #fff;
  cursor: pointer;
  font-weight: 800;
}

.lang-btn.active {
  color: #fff;
  background: var(--teal);
}

.field {
  display: grid;
  gap: 8px;
  color: var(--ink);
  font-weight: 760;
}

.field input,
.field textarea,
.field select {
  width: 100%;
  border: 1px solid var(--line);
  background: #fbfcfa;
  color: var(--ink);
  padding: 12px 13px;
  border-radius: 6px;
  outline: none;
  font-weight: 520;
}

.field textarea {
  resize: vertical;
}

.field input:focus,
.field textarea:focus,
.field select:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(47, 111, 159, 0.14);
}

.chip-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 8px;
}

.chip {
  min-height: 42px;
  border: 1px solid #cfd8d2;
  background: #f4f7f4;
  color: #26413f;
  border-radius: 6px;
  cursor: pointer;
  font-weight: 780;
}

.chip:hover {
  border-color: var(--teal);
}

.data-panel {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px 14px;
  margin: 0;
  padding: 15px;
  border: 1px solid var(--line);
  border-radius: 6px;
}

.data-panel legend {
  padding: 0 8px;
  color: var(--ink);
  font-weight: 820;
}

.data-panel label {
  display: flex;
  gap: 9px;
  align-items: start;
  min-height: 30px;
  color: #344247;
  font-size: 0.94rem;
}

.data-panel input {
  width: 17px;
  height: 17px;
  accent-color: var(--teal);
  margin-top: 3px;
}

.primary-action,
.secondary-action,
.settings-action,
.tertiary-action,
.icon-action {
  border: 0;
  border-radius: 6px;
  cursor: pointer;
  font-weight: 850;
}

.primary-action {
  min-height: 50px;
  color: #fff;
  background: var(--teal);
  box-shadow: 0 10px 22px rgba(22, 95, 90, 0.24);
}

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

.primary-action.is-processing {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
}

.primary-action.is-processing::before {
  content: "";
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255, 255, 255, 0.5);
  border-top-color: #fff;
  border-radius: 999px;
  animation: spin 0.8s linear infinite;
}

.primary-action.is-processing:disabled {
  color: #fff;
  background: var(--teal);
  box-shadow: 0 10px 22px rgba(22, 95, 90, 0.24);
  cursor: progress;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.primary-action:disabled,
.primary-action.is-disabled {
  color: #8c9698;
  background: #e4e7e4;
  box-shadow: none;
  cursor: not-allowed;
}

.secondary-action {
  min-width: 92px;
  min-height: 38px;
  color: #fff;
  background: var(--coral);
}

.secondary-action:disabled {
  color: #8c9698;
  background: #e4e7e4;
  cursor: not-allowed;
}

.settings-action,
.tertiary-action {
  min-height: 38px;
  padding: 0 14px;
  color: var(--teal-dark);
  background: #e6f1ee;
  border: 1px solid #bfd8d2;
  white-space: nowrap;
}

.gear-action {
  width: 42px;
  min-width: 42px;
  padding: 0;
  font-size: 1.25rem;
  line-height: 1;
}

.settings-action:hover,
.tertiary-action:hover {
  border-color: var(--teal);
}

.icon-action {
  width: 36px;
  height: 36px;
  color: var(--muted);
  background: #f3f5f2;
  border: 1px solid var(--line);
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: grid;
  place-items: center;
  padding: 18px;
  background: rgba(21, 28, 30, 0.46);
}

.modal-backdrop[hidden] {
  display: none;
}

.settings-modal {
  width: min(560px, 100%);
  padding: 22px;
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.modal-header,
.modal-actions {
  display: flex;
  justify-content: space-between;
  align-items: start;
  gap: 16px;
}

.settings-note {
  margin: 16px 0;
  color: #3d474d;
}

.settings-form {
  display: grid;
  gap: 16px;
}

.modal-actions {
  align-items: center;
}

.status {
  margin: 18px 0;
  padding: 12px 14px;
  color: var(--teal-dark);
  background: #e9f4f1;
  border-left: 4px solid var(--teal);
  font-weight: 720;
}

.status-muted {
  color: #634614;
  background: #fff7df;
  border-left-color: var(--gold);
}

.status-error {
  color: #852d1d;
  background: #fff0eb;
  border-left-color: var(--coral);
}

.markdown-output {
  max-width: 76ch;
  color: #283136;
}

.markdown-output:empty {
  display: none;
}

.markdown-output h2,
.markdown-output h3,
.markdown-output h4 {
  margin: 24px 0 10px;
}

.markdown-output h2 {
  font-size: 1.35rem;
}

.markdown-output h3 {
  padding: 10px 12px;
  font-size: 1.12rem;
  color: var(--teal-dark);
  background: #e9f4f1;
  border-left: 4px solid var(--teal);
}

.markdown-output h4 {
  padding-bottom: 6px;
  font-size: 1rem;
  color: var(--coral);
  border-bottom: 1px solid var(--line);
}

.markdown-output p {
  margin: 10px 0;
}

.markdown-output hr {
  height: 1px;
  margin: 18px 0;
  border: 0;
  background: var(--line);
}

.markdown-output ul,
.markdown-output ol {
  margin: 8px 0 16px;
  padding-left: 1.35rem;
}

.markdown-output li {
  margin: 7px 0;
}

.markdown-output code {
  padding: 2px 5px;
  background: #eef1ef;
  border-radius: 4px;
}

.markdown-output blockquote {
  margin: 16px 0;
  padding: 12px 14px;
  background: #f8f1e5;
  border-left: 4px solid var(--gold);
}

.table-wrap {
  width: 100%;
  overflow-x: auto;
  margin: 14px 0 18px;
  border: 1px solid var(--line);
}

.markdown-output table {
  width: 100%;
  min-width: 620px;
  border-collapse: collapse;
  background: #fff;
}

.markdown-output th,
.markdown-output td {
  padding: 10px 12px;
  border: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.markdown-output th {
  color: var(--teal-dark);
  background: #e9f4f1;
  font-weight: 850;
}

@media (max-width: 1060px) {
  .intro-panel,
  .workspace {
    grid-template-columns: 1fr;
  }

  .workspace {
    gap: 20px;
  }

  .workspace-resizer {
    display: none;
  }

  .loop-strip {
    grid-template-columns: repeat(5, minmax(72px, 1fr));
    overflow-x: auto;
  }

  .method-strip {
    grid-template-columns: repeat(3, minmax(112px, 1fr));
  }

  .output-panel {
    min-height: 420px;
  }

}

@media (max-width: 720px) {
  .app-shell {
    padding: 12px;
  }

  .intro-panel,
  .input-panel,
  .output-panel {
    padding: 16px;
  }

  .book-lockup,
  .intro-actions,
  .topbar,
  .output-toolbar,
  .modal-header,
  .modal-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .chip-grid,
  .data-panel {
    grid-template-columns: 1fr;
  }

  .language-toggle {
    width: 100%;
    grid-template-columns: repeat(2, 1fr);
  }
}