/* 旅行英语 — 设计系统（移动优先，纯本地，无外部字体/CDN） */
:root {
  --blue: #2b6cb0;
  --blue-d: #234e7d;
  --sky: #e8f2fb;
  --amber: #f0a500;
  --green: #2f9e6f;
  --green-l: #e4f6ee;
  --red: #d9534f;
  --red-l: #fbe9e8;
  --ink: #1f2933;
  --muted: #6b7785;
  --line: #e2e8f0;
  --bg: #f5f7fa;
  --card: #ffffff;
  --radius: 14px;
  --shadow: 0 2px 10px rgba(30, 50, 80, .08);
  font-size: 17px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.55;
  -webkit-text-size-adjust: 100%;
}

/* 顶栏 / 底栏 */
.app-bar {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: baseline; gap: 10px;
  padding: 12px 16px; padding-top: max(12px, env(safe-area-inset-top));
  background: linear-gradient(120deg, var(--blue), var(--blue-d));
  color: #fff; box-shadow: var(--shadow);
}
.brand { color: #fff; text-decoration: none; font-weight: 700; font-size: 1.1rem; }
.brand-sub { font-size: .75rem; opacity: .85; }
.app-foot { text-align: center; color: var(--muted); font-size: .78rem; padding: 24px 16px 40px; }

.container { max-width: 680px; margin: 0 auto; padding: 16px; }

/* 卡片与按钮 */
.card {
  background: var(--card); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 18px; margin-bottom: 16px;
}
.card-head { font-weight: 700; margin-bottom: 12px; display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.card-head.standalone { margin: 4px 4px 12px; }

.btn {
  appearance: none; border: 1px solid var(--line); background: #fff; color: var(--ink);
  padding: 11px 16px; border-radius: 10px; font-size: .95rem; font-weight: 600;
  cursor: pointer; transition: transform .05s, background .15s, opacity .15s;
}
.btn:active { transform: scale(.97); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn.primary { background: var(--blue); color: #fff; border-color: var(--blue); }
.btn.primary:disabled { background: var(--muted); border-color: var(--muted); }
.btn.ghost { background: transparent; border-color: transparent; color: var(--blue); }
.btn.small { padding: 7px 11px; font-size: .82rem; }
.btn.big { padding: 14px 22px; font-size: 1.05rem; width: 100%; margin-top: 12px; }
.btn.danger { background: var(--red-l); color: var(--red); border-color: #f3c6c4; }
.btn.rate.picked { background: var(--green); color: #fff; border-color: var(--green); }
.btn.recording { background: var(--red); color: #fff; border-color: var(--red); }

.link-back { background: none; border: none; color: var(--blue); font-size: .95rem; cursor: pointer; padding: 4px 0; margin-bottom: 8px; }

.btn-speak {
  border: none; background: var(--sky); color: var(--blue); border-radius: 8px;
  padding: 4px 9px; cursor: pointer; font-size: .9rem; margin-left: 6px;
}
.btn-speak.big { font-size: 1.15rem; padding: 8px 12px; min-width: 44px; }

.muted { color: var(--muted); }
.hint { color: var(--muted); font-size: .82rem; margin-top: 8px; }
.warn { color: var(--amber); font-weight: 600; }

/* TTS 警告条 */
.tts-warn { background: #fff7e6; border: 1px solid #f5d78e; color: #8a6d1a; padding: 10px 14px; border-radius: 10px; margin: 0 0 12px; font-size: .85rem; }

/* ---------- 首页 ---------- */
.top-stats { display: flex; gap: 10px; margin-bottom: 16px; }
.stat { flex: 1; background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow); padding: 12px; text-align: center; }
.stat-val { font-size: 1.3rem; font-weight: 800; }
.stat-ico { margin-right: 4px; }
.stat-label { font-size: .72rem; color: var(--muted); }

.cta-card { background: linear-gradient(135deg, #3a7bd5, #2b6cb0); color: #fff; border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow); margin-bottom: 16px; }
.cta-label { font-size: .78rem; opacity: .9; letter-spacing: .05em; }
.cta-title { font-size: 1.25rem; font-weight: 800; margin: 4px 0; }
.cta-cando { font-size: .9rem; opacity: .95; }
.cta-card .btn.primary { background: #fff; color: var(--blue); border-color: #fff; }

.review-banner { width: 100%; text-align: left; background: var(--green-l); color: var(--green); border: 1px solid #bfe6d3; border-radius: 12px; padding: 12px 16px; font-weight: 700; cursor: pointer; margin-bottom: 16px; }

.section-title { font-size: 1.02rem; margin: 20px 4px 10px; }

/* 护照 · 模块 */
.mod-card { background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow); padding: 14px; margin-bottom: 12px; border-left: 4px solid var(--line); }
.mod-card.stamped { border-left-color: var(--green); }
.mod-head { display: flex; align-items: center; gap: 10px; margin-bottom: 10px; }
.mod-icon { font-size: 1.5rem; }
.mod-name { flex: 1; font-weight: 700; }
.mod-progress { font-size: .74rem; color: var(--muted); font-weight: 500; }
.stamp { color: var(--green); font-size: .78rem; font-weight: 700; border: 1.5px dashed var(--green); border-radius: 8px; padding: 2px 6px; transform: rotate(-4deg); }
.unit-chips { display: flex; flex-direction: column; gap: 6px; }
.unit-chip { display: flex; align-items: center; gap: 8px; text-align: left; background: #f8fafc; border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; font-size: .9rem; font-weight: 600; color: var(--ink); cursor: pointer; }
.unit-chip.completed { background: var(--green-l); border-color: #bfe6d3; }
.unit-chip.locked { opacity: .55; cursor: not-allowed; }
.chip-status { font-size: .95rem; }

/* 能做什么面板 */
.cando-panel .cando-row { padding: 5px 0; border-bottom: 1px dashed var(--line); font-size: .92rem; }
.cando-next { margin-top: 10px; color: var(--blue); font-weight: 700; }
.cando-note { margin-top: 10px; font-size: .78rem; color: var(--muted); }
.home-foot { text-align: center; margin-top: 12px; }

/* ---------- 单元 stepper ---------- */
.unit-header { display: flex; align-items: flex-start; gap: 6px; flex-direction: column; margin-bottom: 10px; }
.unit-module { font-size: .74rem; color: var(--muted); }
.unit-title { font-size: 1.15rem; font-weight: 800; }
.step-dots { display: flex; gap: 6px; margin-bottom: 14px; flex-wrap: wrap; }
.dot { width: 22px; height: 5px; border-radius: 3px; background: var(--line); }
.dot.done { background: var(--green); }
.dot.active { background: var(--blue); }
.step-content { min-height: 40px; }
.step-nav { display: flex; justify-content: space-between; align-items: center; gap: 10px; margin-top: 18px; }
.step-nav .btn.next { min-width: 130px; }

.objective .obj-badge { color: var(--amber); font-weight: 700; }
.obj-cando { font-size: 1.15rem; font-weight: 700; margin: 8px 0; }
.obj-intro { color: #445; }
.obj-tip { margin-top: 12px; font-size: .85rem; color: var(--muted); background: var(--sky); padding: 10px; border-radius: 10px; }

/* 对话 */
.dlg-line { display: flex; gap: 8px; margin-bottom: 12px; }
.dlg-line.you { flex-direction: row-reverse; }
.dlg-who { font-size: .68rem; color: var(--muted); min-width: 42px; text-align: center; padding-top: 6px; }
.dlg-bubble { background: #f1f5f9; border-radius: 12px; padding: 10px 12px; max-width: 78%; }
.dlg-line.you .dlg-bubble { background: var(--sky); }
.dlg-en { font-weight: 600; }
.dlg-zh { font-size: .82rem; color: var(--muted); margin-top: 2px; }

/* 句型 */
.phrase { display: flex; gap: 10px; align-items: flex-start; padding: 10px 0; border-bottom: 1px dashed var(--line); }
.phrase:last-child { border-bottom: none; }
.phrase-en { font-weight: 700; }
.phrase-zh { font-size: .86rem; color: #445; }
.phrase-note { font-size: .78rem; color: var(--amber); margin-top: 2px; }

/* 题目 */
.item-list { display: flex; flex-direction: column; gap: 14px; }
.item { background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow); padding: 16px; }
.q-zh { font-weight: 700; margin-bottom: 6px; }
.q-en { color: #334; margin-bottom: 10px; }
.q-en.model { font-size: 1.15rem; font-weight: 700; color: var(--blue); }
.listen-head { margin-bottom: 10px; }
.options { display: flex; flex-direction: column; gap: 8px; margin-top: 8px; }
.opt { text-align: left; background: #f8fafc; border: 1.5px solid var(--line); border-radius: 10px; padding: 12px; font-size: .95rem; cursor: pointer; }
.opt.correct { background: var(--green-l); border-color: var(--green); color: var(--green); font-weight: 700; }
.opt.wrong { background: var(--red-l); border-color: var(--red); color: var(--red); }
.opt:disabled { cursor: default; }

.feedback { margin-top: 10px; font-weight: 700; }
.feedback.ok { color: var(--green); }
.feedback.no { color: var(--red); }
.feedback .explain { font-weight: 400; color: var(--muted); font-size: .84rem; margin-top: 3px; }

.fill-sentence .blank { display: inline-block; min-width: 60px; border-bottom: 2px solid var(--blue); text-align: center; color: var(--blue); font-weight: 700; }
.fill-sentence .blank.filled { border-bottom-style: solid; }

/* 排句 */
.order-answer { min-height: 44px; border: 1.5px dashed var(--line); border-radius: 10px; padding: 8px; display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 10px; background: #fbfdff; }
.order-pool { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 10px; }
.chip { background: #fff; border: 1.5px solid var(--blue); color: var(--blue); border-radius: 8px; padding: 8px 12px; font-weight: 600; cursor: pointer; }
.chip.chosen { background: var(--blue); color: #fff; }
.correct-answer { color: var(--green); font-weight: 700; }

/* 口语 */
.item-speak .self-rate { margin-top: 12px; }
.speak-controls { display: flex; flex-wrap: wrap; gap: 8px; margin: 10px 0; }
.self-rate .rate-label { font-size: .85rem; color: var(--muted); margin-bottom: 6px; }
.self-rate { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.r-again { border-color: #f0c9a8; }
.r-ok { border-color: #a8d5f0; }
.r-good { border-color: #a8e6c4; }

/* 关卡结算 */
.quiz-summary { text-align: center; padding: 20px; border-radius: var(--radius); margin-top: 16px; }
.quiz-summary.pass { background: var(--green-l); }
.quiz-summary.fail { background: #fff7e6; }
.qs-score { font-size: 1.6rem; font-weight: 800; }
.qs-msg { margin: 8px 0 14px; }
.quiz-summary .btn { margin: 4px; }

.result { text-align: center; }
.result-stars { font-size: 2rem; }
.result-title { font-size: 1.3rem; font-weight: 800; margin: 6px 0; }
.result-cando { color: var(--green); font-weight: 600; }
.result-xp { margin: 12px 0; color: var(--amber); font-weight: 700; }
.result-stamp { background: var(--green-l); color: var(--green); border-radius: 10px; padding: 10px; font-weight: 700; margin: 10px 0; }
.result-unlock { margin-top: 12px; font-weight: 700; }
.result .btn { margin-top: 12px; }

/* ---------- 情景闯关 ---------- */
.scenario { }
.sc-intro { background: var(--sky); border-radius: 10px; padding: 12px; margin-bottom: 12px; font-size: .9rem; }
.sc-log { max-height: 320px; overflow-y: auto; display: flex; flex-direction: column; gap: 10px; padding: 4px; margin-bottom: 12px; }
.sc-line { display: flex; flex-direction: column; }
.sc-line.you { align-items: flex-end; }
.sc-who { font-size: .68rem; color: var(--muted); margin-bottom: 2px; }
.sc-bubble { background: #f1f5f9; border-radius: 12px; padding: 10px 12px; max-width: 85%; }
.sc-line.you .sc-bubble, .sc-line.you .sc-zh { background: var(--sky); }
.sc-line.good .sc-en { color: var(--green); }
.sc-en { font-weight: 600; }
.sc-zh { font-size: .82rem; color: var(--muted); margin-top: 2px; }
.sc-line.react .sc-zh { background: #fff7e6; color: #8a6d1a; padding: 8px 10px; border-radius: 10px; }
.sc-prompt { font-weight: 700; margin-bottom: 8px; }
.sc-choices { display: flex; flex-direction: column; gap: 8px; }
.sc-choice { text-align: left; background: #fff; border: 1.5px solid var(--line); border-radius: 10px; padding: 12px; cursor: pointer; }
.sc-choice.wrong { background: var(--red-l); border-color: var(--red); opacity: .7; }
.sc-choice-en { font-weight: 700; }
.sc-choice-zh { font-size: .8rem; color: var(--muted); }
.sc-end { text-align: center; padding: 16px; border-radius: 12px; }
.sc-end.win { background: var(--green-l); }
.sc-end.fail { background: #fff7e6; }
.sc-end-title { font-size: 1.1rem; font-weight: 800; margin-bottom: 6px; }

/* ---------- 复习 ---------- */
.review-progress { text-align: center; color: var(--muted); font-size: .8rem; margin-bottom: 10px; }
.flashcard { background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow); padding: 28px 18px; text-align: center; margin-bottom: 12px; }
.fc-front { font-size: 1.3rem; font-weight: 700; }
.fc-back { margin-top: 16px; padding-top: 16px; border-top: 1px dashed var(--line); }
.fc-en { font-size: 1.25rem; font-weight: 700; color: var(--blue); display: inline-block; margin-right: 8px; }
.hidden { display: none !important; }
.rate-row { display: flex; gap: 8px; }
.rate-row .btn { flex: 1; }

/* ---------- 设置 / 分级 ---------- */
.set-row { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin: 14px 0; }
.set-row label { min-width: 84px; font-weight: 600; }
.set-row input[type=range] { flex: 1; }
.set-row select { flex: 1; padding: 8px; border-radius: 8px; border: 1px solid var(--line); }
.set-val { color: var(--muted); font-size: .85rem; }
hr { border: none; border-top: 1px solid var(--line); margin: 18px 0; }
.placement-result { text-align: center; }
.pr-level { font-size: 1.3rem; font-weight: 800; color: var(--blue); }

@media (min-width: 560px) {
  .unit-chips { flex-direction: row; flex-wrap: wrap; }
  .unit-chip { flex: 1 1 45%; }
}