/* German Buddy · 样式 */
:root {
  --bg: #f7f7f5;
  --card: #ffffff;
  --ink: #1f2937;
  --muted: #6b7280;
  --line: #e5e7eb;
  --accent: #1f2937;
  --accent-ink: #ffffff;
  --ok: #15803d;
  --ok-bg: #ecfdf3;
  --almost: #b45309;
  --almost-bg: #fffbeb;
  --bad: #b91c1c;
  --bad-bg: #fef2f2;
  /* 词性配色（对齐 Momente）：der 蓝 / das 绿 / die 红 / 复数 黄 */
  --der: #2563eb;
  --das: #16a34a;
  --die: #dc2626;
  --pl: #ca8a04;
  --radius: 14px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111827; --card: #1f2937; --ink: #f3f4f6; --muted: #9ca3af; --line: #374151;
    --accent: #f3f4f6; --accent-ink: #111827;
    --ok-bg: #052e16; --almost-bg: #3b2a06; --bad-bg: #3f0d0d;
    --ok: #4ade80; --almost: #fbbf24; --bad: #f87171;
    --der: #60a5fa; --das: #4ade80; --die: #f87171; --pl: #facc15;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--ink); }
body { font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; -webkit-text-size-adjust: 100%; }
button, input { font: inherit; color: inherit; }

.topbar { position: sticky; top: 0; z-index: 2; display: flex; align-items: center; justify-content: space-between;
  padding: 10px 16px; padding-top: max(10px, env(safe-area-inset-top)); background: var(--card); border-bottom: 1px solid var(--line); }
.brand { font-weight: 700; display: flex; align-items: center; gap: 8px; margin-right: auto; }
.flag { width: 18px; height: 12px; border-radius: 2px; background: linear-gradient(#000 0 33%, #dd0000 33% 66%, #ffce00 66%); }
.ver { color: var(--muted); font-size: 12px; }

main { max-width: 720px; margin: 0 auto; padding: 16px; padding-bottom: max(24px, env(safe-area-inset-bottom)); }
h1 { font-size: 24px; margin: 8px 0; }
h2 { font-size: 18px; margin: 20px 0 8px; }
.muted { color: var(--muted); }
.small { font-size: 14px; }

.btn { border: 1px solid var(--line); background: var(--card); border-radius: 999px; padding: 10px 16px; cursor: pointer; min-height: 44px; }
.btn.small { padding: 6px 12px; min-height: 36px; font-size: 14px; }
.btn.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.btn.ghost { background: transparent; }
.btn:disabled { opacity: .5; cursor: default; }
.row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }

.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; margin: 12px 0; }
.card .label { color: var(--muted); font-size: 13px; text-transform: uppercase; letter-spacing: .04em; }
.count { color: var(--muted); font-size: 13px; }
.big { font-size: 36px; font-weight: 700; }

/* 首页 */
.resume { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.home-courses { margin-top: 16px; }

/* 上课头部 */
.lesson-head { display: grid; gap: 8px; }
.lesson-title { font-weight: 600; }
.lesson-title .num { color: var(--muted); }
.stepper { list-style: none; display: flex; flex-wrap: wrap; gap: 6px; padding: 0; margin: 0; }
.stepper li { font-size: 13px; padding: 4px 10px; border-radius: 999px; border: 1px solid var(--line); color: var(--muted); white-space: nowrap; }
.stepper li.on { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.stepper li.past { color: var(--ok); border-color: var(--ok); }
.stage-foot { margin-top: 20px; text-align: center; }

/* 词性配色 */
.word { font-weight: 600; }
.noun.art-der .art { color: var(--der); }
.noun.art-das .art { color: var(--das); }
.noun.art-die .art { color: var(--die); }
.noun.art-der { border-bottom: 3px solid var(--der); }
.noun.art-das { border-bottom: 3px solid var(--das); }
.noun.art-die { border-bottom: 3px solid var(--die); }
.plural.art-pl { color: var(--pl); font-weight: 600; }
.plural.none { color: var(--muted); font-size: 14px; }
.pos { color: var(--muted); font-size: 14px; font-style: italic; }

/* 闪卡 */
.flashcard { text-align: center; padding: 24px 16px; }
.flashcard .front { font-size: 30px; margin: 16px 0; }
.flashcard .meaning { font-size: 20px; margin: 16px 0 6px; }
.flashcard .row { justify-content: center; }
.speak-btns { display: inline-flex; gap: 6px; flex-wrap: wrap; margin-top: 8px; }

/* 配对 */
.match { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.match .col { display: grid; gap: 8px; align-content: start; }
.tile { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 12px; min-height: 52px; cursor: pointer; text-align: left; }
.tile.picked { outline: 3px solid var(--accent); }
.tile.matched { background: var(--ok-bg); border-color: var(--ok); opacity: .7; }
.tile.wrong { background: var(--bad-bg); border-color: var(--bad); }

/* 句子 / 作答 */
.sentence { font-size: 22px; font-weight: 600; margin: 8px 0; }
.en { color: var(--muted); font-size: 14px; }
.prompt { font-size: 18px; margin-top: 6px; }
.answer { display: flex; flex-wrap: wrap; gap: 8px; margin: 12px 0; }
.answer input { flex: 1 1 100%; padding: 12px 14px; border: 1px solid var(--line); border-radius: 12px; background: var(--card); min-height: 48px; }
.feedback { border-radius: var(--radius); padding: 14px 16px; margin: 12px 0; border: 1px solid; }
.feedback .head { font-weight: 700; }
.feedback .model { margin-top: 6px; font-size: 18px; }
.feedback .heard { color: var(--muted); font-size: 14px; }
.feedback .tip { margin-top: 6px; font-size: 14px; }
.feedback.correct { background: var(--ok-bg); border-color: var(--ok); }
.feedback.correct .head { color: var(--ok); }
.feedback.almost { background: var(--almost-bg); border-color: var(--almost); }
.feedback.almost .head { color: var(--almost); }
.feedback.wrong { background: var(--bad-bg); border-color: var(--bad); }
.feedback.wrong .head { color: var(--bad); }
.toast { color: var(--bad); text-align: center; }

/* 对话 */
.dialogue { display: grid; gap: 10px; margin: 12px 0; }
.bubble { max-width: 85%; padding: 10px 14px; border-radius: 16px; background: var(--card); border: 1px solid var(--line); }
.bubble .who { font-size: 12px; color: var(--muted); }
.bubble.me { justify-self: end; background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.bubble.me .who { color: inherit; opacity: .7; }

/* 小结 */
.review { padding-left: 20px; }
.review li { margin: 6px 0; }

/* 录音中 / 设置 */
.btn.recording { background: var(--bad); color: #fff; border-color: var(--bad); }
.partial { flex-basis: 100%; margin: 4px 0 0; }
.setting { display: flex; align-items: center; gap: 8px; margin-top: 24px; color: var(--muted); font-size: 14px; }
.setting input { width: 18px; height: 18px; }

/* 上课页头部按钮行 / 本课词表 */
.head-row { display: flex; justify-content: space-between; gap: 8px; }
.noun.art-pl .art { color: var(--pl); }
.noun.art-pl { border-bottom: 3px solid var(--pl); }
.wordlist { list-style: none; padding: 0; margin: 0; display: grid; gap: 6px; }
.wordlist li { display: grid; grid-template-columns: 1fr auto; column-gap: 8px; align-items: center;
  background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 8px 12px; }
.wordlist .wl-de { grid-column: 1; }
.wordlist .wl-en { grid-column: 1; color: var(--muted); font-size: 14px; }
.wordlist .btn { grid-column: 2; grid-row: 1 / span 2; }
.extra { font-size: 12px; color: var(--muted); border: 1px solid var(--line); border-radius: 999px; padding: 0 6px; font-weight: 400; }

/* 重试提示 */
.feedback .hint { margin-top: 6px; font-size: 20px; letter-spacing: .04em; font-family: ui-monospace, "Cascadia Mono", Consolas, monospace; }
.feedback mark { background: var(--almost-bg); color: var(--almost); border-bottom: 2px solid var(--almost); padding: 0 2px; border-radius: 3px; }

/* 录音倒计时 */
.countdown { flex-basis: 100%; text-align: center; font-size: 28px; font-weight: 700; color: var(--bad); margin-top: 4px; }

/* 错题 / 提示 / 跟读点词 */
.perfect { font-size: 18px; color: var(--ok); font-weight: 600; }
.mistakes { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
.mistakes li { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 10px 12px; }
.mistakes .task { color: var(--muted); font-size: 14px; }
.mistakes .you { color: var(--bad); }
.mistakes .ans { font-weight: 600; }
.mistakes .row { margin-top: 6px; }
.answer + .hint, .hint { font-family: ui-monospace, "Cascadia Mono", Consolas, monospace; font-size: 18px; margin: 8px 0; }
.sentence .w { background: none; border: 0; padding: 0 1px; font: inherit; color: inherit; cursor: pointer; border-bottom: 1px dotted var(--muted); }
.sentence .w:hover, .sentence .w:focus { color: var(--der); }

/* 跟读没对上的词 */
.feedback mark.miss { background: var(--bad-bg); color: var(--bad); border-bottom: 2px solid var(--bad); font-weight: 700; }
.feedback mark.near { background: var(--almost-bg); color: var(--almost); border-bottom: 2px solid var(--almost); }

/* 语法讲解卡与填空 */
.grammar-card .pattern { margin: 4px 0 2px; font-size: 22px; }
.grammar-card .note { margin: 10px 0; }
.grammar-card .examples { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.grammar-card .examples li { border-top: 1px solid var(--line); padding-top: 8px; }
.grammar-card .examples .sentence { font-size: 19px; margin: 0 0 2px; }
.grammar-card .examples .en { color: var(--muted); font-size: 14px; margin-bottom: 4px; }
.prompt .gap { display: inline-block; min-width: 3em; border-bottom: 2px solid var(--ink); color: transparent; }

/* Extras：课本清单、听写、写作 */
.extras h2 { margin-top: 24px; }
.book-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 6px; }
.book-list li { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 10px 12px; }
.book-list label { display: block; cursor: pointer; }
.book-list input { margin-right: 6px; transform: scale(1.2); }
.book-list .where { font-weight: 700; }
.book-list .skill { color: var(--der); font-weight: 600; }
.extras textarea { width: 100%; margin-top: 8px; padding: 10px; border: 1px solid var(--line); border-radius: 10px;
  background: var(--bg); color: var(--ink); font: inherit; resize: vertical; }
.writing-result .checks, .writing-result .self-check { padding-left: 0; list-style: none; margin: 0; }
.writing-result .checks .ok { color: var(--ok); }
.writing-result .checks .no { color: var(--bad); }
.writing-result .self-check li::before { content: "☐ "; color: var(--muted); }
.writing-result .model-text { font-size: 17px; }

/* 课程侧栏（参考 Mandarin Buddy：课程标题行 + 平铺课按钮）：电脑常驻，手机抽屉 */
.menu-btn { border: 0; background: none; color: inherit; font-size: 22px; line-height: 1; min-width: 44px; min-height: 44px;
  margin: -8px 4px -8px -10px; cursor: pointer; }
.sidebar { background: var(--card); padding: 16px 12px; overflow-y: auto; }
.course-group { display: flex; flex-direction: column; gap: 4px; margin-bottom: 16px; }
.course-title { display: flex; align-items: center; gap: 8px; padding: 9px 10px; margin-bottom: 2px;
  background: var(--bg); border: 1px solid var(--line); border-radius: 10px; font-size: 13px; font-weight: 700; letter-spacing: .3px; }
.course-title .ct-title { flex: 1; min-width: 0; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.course-title .ct-count { flex-shrink: 0; font-size: 12px; font-weight: 600; color: var(--muted); }
.nav-lesson { display: flex; align-items: center; gap: 8px; width: 100%; min-width: 0; padding: 8px 10px; min-height: 40px;
  background: var(--card); color: var(--ink); border: 1px solid var(--line); border-radius: 8px; font: inherit; font-size: 14px;
  text-align: left; cursor: pointer; }
.nav-lesson:hover { background: var(--bg); }
.nav-lesson .num { flex-shrink: 0; width: 28px; height: 24px; display: grid; place-items: center; border-radius: 6px;
  background: var(--bg); font-size: 12px; font-weight: 700; }
.nav-lesson .t { flex: 1; min-width: 0; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.nav-lesson .ok { flex-shrink: 0; color: var(--ok); font-weight: 700; }
.nav-lesson.done .num { background: var(--ok-bg); color: var(--ok); }
.nav-lesson.current { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); font-weight: 600; }
.nav-lesson.current .num { background: rgba(127, 127, 127, .25); color: inherit; }
.nav-lesson.current .ok { color: inherit; }
.sidebar-backdrop[hidden] { display: none; }

@media (min-width: 860px) {
  .layout { display: grid; grid-template-columns: 280px minmax(0, 1fr); align-items: start; }
  .sidebar { position: sticky; top: var(--topbar-h, 45px); height: calc(100vh - var(--topbar-h, 45px)); border-right: 1px solid var(--line); }
  .menu-btn, .sidebar-backdrop, .home-courses { display: none !important; }
}
@media (max-width: 859.98px) {
  .sidebar { position: fixed; top: 0; left: 0; bottom: 0; z-index: 60; width: min(300px, 84vw);
    padding-top: max(16px, env(safe-area-inset-top)); padding-bottom: max(16px, env(safe-area-inset-bottom));
    transform: translateX(-105%); transition: transform .25s ease; }
  .sidebar.open { transform: translateX(0); box-shadow: 0 0 44px rgba(0, 0, 0, .35); }
  .sidebar-backdrop { position: fixed; inset: 0; z-index: 55; border: 0; padding: 0; background: rgba(0, 0, 0, .45); cursor: pointer; }
}