:root {
  --bg: #f5f7fa;
  --panel: #ffffff;
  --text: #17212b;
  --muted: #6b7785;
  --line: #dce3ea;
  --blue: #2563eb;
  --blue-soft: #e8f0ff;
  --green: #15956a;
  --amber: #b7791f;
  --red: #c24141;
  --shadow: 0 18px 45px rgba(17, 24, 39, .08);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
}
button, input, select { font: inherit; }
button { cursor: pointer; }

.topbar {
  height: 64px;
  display: flex; align-items: center; justify-content: space-between; gap: 20px;
  padding: 0 28px;
  background: var(--panel);
  border-bottom: 1px solid var(--line);
}
.back-link {
  color: var(--blue);
  text-decoration: none;
  font-weight: 800;
  font-size: .9rem;
}
.topbar > div { display: flex; align-items: center; gap: 12px; }
.topbar strong { font-size: 1rem; }
.topbar span {
  color: var(--muted);
  font-size: .82rem;
  padding: 5px 10px;
  border-radius: 999px;
  background: #f1f4f8;
}

.wizard-shell {
  display: grid;
  grid-template-columns: 270px minmax(0, 1fr);
  gap: 22px;
  max-width: 1320px;
  margin: 0 auto;
  padding: 28px;
}
.steps {
  position: sticky; top: 28px;
  display: grid; gap: 10px;
  align-self: start;
}
.step {
  display: grid;
  grid-template-columns: 38px 1fr;
  gap: 12px;
  text-align: left;
  border: 1px solid var(--line);
  background: var(--panel);
  border-radius: 14px;
  padding: 15px;
}
.step:disabled { opacity: .55; cursor: default; }
.step span {
  width: 38px; height: 38px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  background: #eef2f7;
  color: var(--muted);
  font-weight: 900;
  grid-row: span 2;
}
.step strong { font-size: .96rem; }
.step em { color: var(--muted); font-size: .78rem; font-style: normal; }
.step.active {
  border-color: var(--blue);
  box-shadow: 0 10px 28px rgba(37, 99, 235, .12);
}
.step.active span { background: var(--blue); color: white; }
.step.done span { background: var(--green); color: white; }

.stage { min-width: 0; }
.panel {
  display: none;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: var(--shadow);
  padding: 24px;
  min-height: calc(100vh - 120px);
}
.panel.active { display: block; }
.panel-head {
  display: flex; align-items: flex-start; justify-content: space-between; gap: 18px;
  margin-bottom: 24px;
}
.panel-head p {
  color: var(--blue);
  font-size: .78rem;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: .08em;
  margin-bottom: 5px;
}
.panel-head h1 { font-size: 1.65rem; line-height: 1.25; }
.panel-head span { display: block; color: var(--muted); font-size: .88rem; margin-top: 6px; }
.panel-actions { display: flex; gap: 8px; flex-wrap: wrap; justify-content: flex-end; }
.ghost-btn {
  border: 1px solid var(--line);
  background: white;
  color: var(--text);
  border-radius: 10px;
  padding: 9px 13px;
  font-weight: 800;
}
.ghost-btn:hover { border-color: var(--blue); color: var(--blue); }

.filter-row {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: 22px;
}
.filter-row label {
  display: grid; gap: 6px;
  color: var(--muted);
  font-size: .78rem;
  font-weight: 800;
}
.filter-row input, .filter-row select {
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0 11px;
  outline: none;
  background: #fbfcfe;
  color: var(--text);
}
.filter-row input:focus, .filter-row select:focus { border-color: var(--blue); }

.book-grid {
  display: grid;
  gap: 22px;
}
.book-group {
  display: grid;
  gap: 12px;
}
.book-group h2 {
  font-size: 1rem;
  color: var(--text);
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
}
.book-group-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}
.book-card {
  border: 1px solid var(--line);
  background: #fbfcfe;
  border-radius: 14px;
  padding: 18px;
  text-align: left;
  min-height: 150px;
  display: grid;
  align-content: space-between;
  gap: 10px;
}
.book-card:hover { border-color: var(--blue); background: white; box-shadow: 0 12px 26px rgba(37,99,235,.1); }
.book-card .book-grade {
  width: max-content;
  padding: 4px 9px;
  border-radius: 999px;
  background: var(--blue-soft);
  color: var(--blue);
  font-size: .76rem;
  font-weight: 900;
}
.book-card strong { font-size: 1.35rem; line-height: 1.2; }
.book-card em { display: block; color: var(--text); font-size: .9rem; font-style: normal; font-weight: 800; }
.book-card small { color: var(--muted); font-size: .8rem; line-height: 1.5; }

.chapter-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 260px;
  gap: 18px;
}
.chapter-list {
  display: grid;
  gap: 8px;
  max-height: calc(100vh - 210px);
  overflow: auto;
  padding-right: 4px;
}
.chapter-node {
  border: 1px solid var(--line);
  background: #fbfcfe;
  border-radius: 12px;
  padding: 11px 12px 11px calc(12px + var(--depth) * 18px);
  text-align: left;
}
.chapter-node:hover { border-color: var(--blue); background: white; }
.chapter-node.article { border-left: 4px solid var(--green); }
.chapter-node strong { display: block; line-height: 1.35; }
.chapter-node span { display: block; color: var(--muted); font-size: .76rem; margin-top: 3px; }
.chapter-help {
  border-radius: 14px;
  background: var(--blue-soft);
  padding: 16px;
  align-self: start;
}
.chapter-help strong { color: var(--blue); display: block; margin-bottom: 8px; }
.chapter-help p { color: #36506e; font-size: .86rem; line-height: 1.7; }

.content-tabs {
  display: flex; gap: 8px; flex-wrap: wrap;
  border-bottom: 1px solid var(--line);
  margin-bottom: 18px;
}
.tab {
  border: none;
  background: transparent;
  padding: 11px 14px;
  color: var(--muted);
  font-weight: 900;
  border-bottom: 3px solid transparent;
}
.tab.active { color: var(--blue); border-bottom-color: var(--blue); }
.tab-panel { display: none; }
.tab-panel.active { display: block; }
.article-box {
  display: grid; gap: 12px;
  max-width: 840px;
}
.article-box p {
  background: #fbfcfe;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px 16px;
  line-height: 1.85;
}
.resource-grid, .extend-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}
.resource-card, .extend-card {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 14px;
  background: #fbfcfe;
}
.resource-card > strong, .extend-card > strong { display: block; margin-bottom: 6px; line-height: 1.45; }
.resource-card > span, .extend-card > span, .extend-card > small {
  display: block;
  color: var(--muted);
  font-size: .84rem;
  line-height: 1.65;
}
.extend-card button {
  margin-top: 10px;
  border: none;
  background: var(--blue);
  color: white;
  border-radius: 9px;
  padding: 8px 10px;
  font-weight: 800;
}
.extend-card button:disabled { opacity: .65; cursor: default; }
.reading-card {
  display: grid;
  gap: 12px;
  align-content: start;
}
.reading-card img {
  width: 100%;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: white;
  display: block;
}
.reading-detail {
  grid-column: 1 / -1;
}
.extend-article-body {
  display: grid;
  gap: 14px;
  margin-top: 8px;
}
.extend-text-block {
  display: grid;
  gap: 10px;
}
.extend-text-block img {
  width: 100%;
  max-width: 260px;
  justify-self: center;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: white;
}
.extend-text-block > p {
  background: white;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px 16px;
  line-height: 1.85;
}
.reading-player {
  background: white;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 18px 20px;
  display: grid;
  gap: 12px;
  width: 100%;
}
.reading-player-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}
.reading-player-bar .play-all-btn {
  margin: 0;
  border-radius: 9px;
  padding: 8px 12px;
  background: var(--green);
}
.reading-player-bar span {
  color: var(--muted);
  font-size: .82rem;
}
.reading-paragraph {
  display: block;
  width: 100%;
  max-width: 760px;
  margin: 0;
  line-height: 2;
  color: #263342;
  font-size: 1.05rem;
  white-space: normal;
  overflow-wrap: anywhere;
}
.sentence-reader {
  display: inline;
  border: 1px solid transparent;
  border-radius: 8px;
  padding: 2px 4px;
  cursor: pointer;
  transition: background .12s ease, border-color .12s ease;
}
.sentence-reader:hover,
.sentence-reader:focus-visible {
  border-color: var(--line);
  background: #f7f9fc;
  outline: none;
}
.sentence-reader.active {
  border-color: #9ec5ff;
  background: #f3f8ff;
}
.sentence-reader.loading {
  opacity: .78;
}
.read-word {
  display: inline;
  border-radius: 7px;
  padding: 0 2px;
  transition: background .12s ease, color .12s ease, transform .12s ease;
}
.read-word.spoken {
  color: var(--green);
}
.read-word.active {
  display: inline-block;
  background: #ffe08a;
  color: #17212b;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(183, 121, 31, .18);
}
.read-punc {
  color: #4f5f6f;
}
/* Dialog tab bar */
.dialog-tab-bar {
  display: flex;
  gap: 6px;
  border-bottom: 2px solid var(--line);
  margin-bottom: 16px;
}
.dialog-tab {
  border: none;
  background: transparent;
  padding: 9px 16px;
  color: var(--muted);
  font-weight: 900;
  font-size: .88rem;
  border-bottom: 3px solid transparent;
  margin-bottom: -2px;
  border-radius: 8px 8px 0 0;
}
.dialog-tab:hover { color: var(--text); background: #f5f7fa; }
.dialog-tab.active { color: var(--blue); border-bottom-color: var(--blue); }

/* Dialog panels */
.dialog-panel { display: none; }
.dialog-panel.active { display: block; }

/* Override reading-player for chat layout */
.chat-player.reading-player {
  padding: 0;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 14px;
  overflow: hidden;
  gap: 0;
}
.chat-player .reading-player-bar {
  padding: 10px 16px;
  border-bottom: 1px solid var(--line);
  background: white;
  border-radius: 0;
}

/* Scene label */
.chat-scene {
  padding: 7px 16px;
  background: #f0f4ff;
  color: #3a5080;
  font-size: .82rem;
  text-align: center;
  border-bottom: 1px solid var(--line);
  line-height: 1.5;
}

/* Chat window — WhatsApp wallpaper style */
.chat-window {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 16px;
  background: #e5ddd5;
  min-height: 160px;
  max-height: 520px;
  overflow-y: auto;
}

/* Bubbles */
.chat-bubble {
  display: flex;
  gap: 8px;
  align-items: flex-end;
  max-width: 78%;
}
.chat-bubble.bubble-right {
  flex-direction: row-reverse;
  align-self: flex-end;
}
.bubble-avatar {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--blue);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: .62rem;
  font-weight: 900;
  flex-shrink: 0;
}
.bubble-right .bubble-avatar { background: var(--green); }

.bubble-content {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}
.bubble-name {
  font-size: .72rem;
  font-weight: 900;
  color: #3a66a0;
  padding: 0 4px;
}
.bubble-right .bubble-name {
  text-align: right;
  color: #2d7a50;
}

.bubble-body {
  background: white;
  border-radius: 0 12px 12px 12px;
  padding: 8px 12px;
  box-shadow: 0 1px 2px rgba(0,0,0,.1);
}
.bubble-right .bubble-body {
  background: #dcf8c6;
  border-radius: 12px 0 12px 12px;
}

.bubble-body .sentence-reader {
  display: block;
  line-height: 1.65;
  font-size: .95rem;
  color: #111;
  border-radius: 6px;
  border: 1px solid transparent;
  padding: 1px 3px;
  margin: -1px -3px;
}
.bubble-body .sentence-reader:hover { border-color: rgba(0,0,0,.14); background: rgba(0,0,0,.04); }
.bubble-body .sentence-reader.active { border-color: rgba(37,99,235,.25); background: rgba(37,99,235,.07); }

.bubble-trans {
  display: block;
  color: rgba(0,0,0,.42);
  font-size: .78rem;
  margin-top: 5px;
  line-height: 1.5;
}

.empty, .error, .loading {
  border: 1px dashed var(--line);
  border-radius: 14px;
  padding: 22px;
  color: var(--muted);
  background: #fbfcfe;
}
.error { color: var(--red); background: #fff7f7; }
.loading { color: var(--amber); background: #fffbeb; }

@media (max-width: 980px) {
  .wizard-shell { grid-template-columns: 1fr; padding: 18px; }
  .steps { position: static; grid-template-columns: repeat(3, 1fr); }
  .filter-row, .chapter-layout, .resource-grid, .extend-grid, .book-group-grid { grid-template-columns: 1fr; }
  .panel { min-height: auto; }
  .chat-bubble { max-width: 88%; }
  .chat-window { padding: 12px; }
}

@media (max-width: 640px) {
  .topbar { height: auto; align-items: flex-start; padding: 14px 18px; flex-direction: column; }
  .steps { grid-template-columns: 1fr; }
  .panel-head { flex-direction: column; }
}