:root {
  color-scheme: light;
  --bg: #f4f7f6;
  --panel: #ffffff;
  --ink: #1f2a2a;
  --muted: #637170;
  --line: #dce5e3;
  --accent: #18756f;
  --accent-weak: #e3f3f0;
  --shadow: 0 16px 40px rgba(22, 56, 54, 0.08);
}

* {
  box-sizing: border-box;
}

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

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

.app-shell {
  min-height: 100vh;
  padding: 18px;
}

.workspace {
  display: grid;
  grid-template-columns: minmax(260px, 320px) minmax(360px, 1fr) minmax(360px, 0.95fr);
  gap: 14px;
  min-height: calc(100vh - 36px);
}

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

.settings-panel {
  display: flex;
  flex-direction: column;
  gap: 18px;
  padding: 18px;
  overflow: auto;
}

.brand {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

.eyebrow {
  margin: 0 0 6px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: 24px;
  line-height: 1.2;
  letter-spacing: 0;
}

.control-group {
  display: grid;
  gap: 8px;
}

.mode-switch {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f8fbfa;
}

label,
legend {
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

select,
textarea,
.source-input,
.html-output {
  width: 100%;
  border: 1px solid var(--line);
  background: #fbfdfd;
  color: var(--ink);
  outline: none;
  border-radius: 6px;
}

select,
input[type="color"] {
  height: 40px;
}

select {
  padding: 0 10px;
}

textarea {
  resize: vertical;
  padding: 12px;
  line-height: 1.65;
}

textarea:focus,
select:focus,
input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-weak);
}

.control-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}

input[type="color"] {
  width: 100%;
  padding: 3px;
  border: 1px solid var(--line);
  background: #fbfdfd;
  border-radius: 6px;
}

.switch-list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.switch-list label {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--ink);
  font-weight: 500;
}

.switch-list input {
  width: 16px;
  height: 16px;
  accent-color: var(--accent);
}

.primary-button,
.tab,
.icon-button,
.mode-button,
.smart-button {
  border: 1px solid var(--line);
  background: #fbfdfd;
  color: var(--ink);
  cursor: pointer;
  border-radius: 6px;
}

.mode-button {
  min-height: 36px;
  font-weight: 700;
}

.mode-button.active {
  background: var(--ink);
  border-color: var(--ink);
  color: #fff;
}

.primary-button {
  min-height: 42px;
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  font-weight: 700;
}

.smart-button {
  min-height: 38px;
  padding: 0 12px;
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  font-size: 13px;
  font-weight: 700;
  white-space: nowrap;
}

.icon-button {
  display: inline-grid;
  place-items: center;
  width: 38px;
  height: 38px;
  font-size: 18px;
}

.tab {
  min-width: 72px;
  height: 36px;
  font-weight: 700;
}

.tab.active {
  background: var(--ink);
  color: #fff;
  border-color: var(--ink);
}

.hint {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.7;
}

.editor-column,
.preview-column {
  display: grid;
  grid-template-rows: auto 1fr;
  min-width: 0;
  overflow: hidden;
}

.preview-column {
  grid-template-rows: auto 1fr auto;
}

.toolbar,
.preview-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 58px;
  padding: 10px 12px;
  border-bottom: 1px solid var(--line);
}

.tabs,
.actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.source-input,
.html-output {
  min-height: 0;
  height: 100%;
  border: 0;
  resize: none;
  padding: 22px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  font-size: 14px;
  line-height: 1.75;
}

.html-output {
  color: #3b3a36;
  background: #f8fbfa;
}

.hidden {
  display: none;
}

.preview-header {
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

#statusText {
  color: var(--accent);
}

.wechat-preview {
  overflow: auto;
  padding: 28px;
  background: #ffffff;
  outline: none;
}

.word-mode .wechat-preview {
  background: #eef3f2;
  padding: 34px;
}

.wechat-preview section {
  max-width: 680px;
  margin: 0 auto;
}

.word-mode .wechat-preview section {
  max-width: none;
}

.wechat-preview:focus {
  box-shadow: inset 0 0 0 3px var(--accent-weak);
}

.copy-tip {
  margin: 0;
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  background: #f8fbfa;
  font-size: 12px;
  line-height: 1.6;
}

.word-only {
  display: none;
}

.word-mode .word-only {
  display: grid;
}

.word-only-inline {
  display: none;
}

.word-mode .word-only-inline {
  display: inline-grid;
  place-items: center;
}

.word-page {
  transform-origin: top center;
}

@media (max-width: 1120px) {
  .workspace {
    grid-template-columns: 280px minmax(360px, 1fr);
  }

  .preview-column {
    grid-column: 1 / -1;
    min-height: 520px;
  }
}

@media (max-width: 980px) {
  .word-page {
    transform: scale(0.78);
    margin-bottom: -220px !important;
  }
}

@media (max-width: 760px) {
  .app-shell {
    padding: 10px;
  }

  .workspace {
    grid-template-columns: 1fr;
    min-height: auto;
  }

  .settings-panel,
  .editor-column,
  .preview-column {
    min-height: auto;
  }

  .source-input,
  .html-output {
    min-height: 420px;
  }

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

  .word-mode .wechat-preview {
    padding: 18px;
  }

  .word-page {
    transform: scale(0.52);
    margin-bottom: -520px !important;
  }
}