/* app.css — B2 词汇复习网页（移动优先；延续插件报告页的徽章配色） */

:root {
  --bg: #f4f5f7;
  --card: #ffffff;
  --ink: #22252b;
  --ink-2: #5b616e;
  --ink-3: #9aa0ab;
  --line: #e3e5ea;
  --accent: #3b6ef5;
  --accent-ink: #ffffff;
  --ok: #2e9e5b;
  --warn: #d98014;
  --bad: #d64545;
  --lv-b2: #7c9a2e;
  --lv-c1: #2e7d9e;
  --lv-c2: #8e5bc0;
  --lv-oov: #8a8f98;
  --lv-empty: #9aa0ab;
  --blank: #ffe9a8;
  --blank-ink: #7a5b00;
  --hl: #d6e4ff;
  --hl-ink: #1d3f9e;
  --safe-b: env(safe-area-inset-bottom, 0px);
  --safe-t: env(safe-area-inset-top, 0px);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161c;
    --card: #1c2029;
    --ink: #e8eaef;
    --ink-2: #a7adba;
    --ink-3: #6b7280;
    --line: #2a2f3a;
    --accent: #5b8cff;
    --ok: #4ecb82;
    --warn: #f0a04b;
    --bad: #ef7070;
    --lv-b2: #9ec257;
    --lv-c1: #58aecf;
    --lv-c2: #b184e8;
    --lv-oov: #7d8490;
    --lv-empty: #6b7280;
    --blank: #4a3d1a;
    --blank-ink: #ffd97a;
    --hl: #2a3c66;
    --hl-ink: #a9c4ff;
  }
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html { height: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Segoe UI", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--ink);
  min-height: 100%;
  font-size: 16px;
  line-height: 1.6;
  overscroll-behavior-y: none;
  -webkit-font-smoothing: antialiased;
}
#app { max-width: 560px; margin: 0 auto; min-height: 100vh; display: flex; flex-direction: column; }
.view { flex: 1; display: flex; flex-direction: column; padding: calc(12px + var(--safe-t)) 16px calc(16px + var(--safe-b)); }
[hidden] { display: none !important; }
button { font-family: inherit; }

/* ---------- 通用 ---------- */
.btn {
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--ink);
  border-radius: 12px;
  padding: 12px 18px;
  font-size: 16px;
  min-height: 44px;
  cursor: pointer;
  transition: opacity .15s;
}
.btn:active { opacity: .6; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn.big { width: 100%; font-size: 17px; padding: 14px; }
.btn.ghost { background: transparent; }
.btn[disabled] { opacity: .4; pointer-events: none; }
.btn-row { display: flex; gap: 10px; margin: 10px 0; }
.btn-col { display: flex; flex-direction: column; gap: 10px; margin-top: 18px; }
.icon-btn {
  border: none; background: transparent; font-size: 20px; color: var(--ink-2);
  min-width: 44px; min-height: 44px; cursor: pointer; border-radius: 10px;
}
.icon-btn:active { opacity: .5; }
.status { min-height: 1.6em; color: var(--ink-2); font-size: 14px; margin: 6px 0; word-break: break-all; }
.status.err { color: var(--bad); }
.status.ok { color: var(--ok); }

.badge {
  display: inline-block; padding: 1px 8px; border-radius: 9px;
  font-size: 12px; font-weight: 600; color: #fff; vertical-align: middle;
}
.badge.lv-B2 { background: var(--lv-b2); }
.badge.lv-C1 { background: var(--lv-c1); }
.badge.lv-C2 { background: var(--lv-c2); }
.badge.lv-OOV, .badge.lv-empty { background: var(--lv-oov); color: #fff; }

#toast {
  position: fixed; left: 50%; bottom: calc(28px + var(--safe-b)); transform: translateX(-50%);
  background: rgba(30,32,40,.92); color: #fff; padding: 9px 16px; border-radius: 10px;
  font-size: 14px; z-index: 99; max-width: 86vw; text-align: center;
}

/* ---------- 加载 ---------- */
.loading-box { flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 14px; color: var(--ink-2); }
.spin { width: 30px; height: 30px; border: 3px solid var(--line); border-top-color: var(--accent); border-radius: 50%; animation: spin .9s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- 设置 ---------- */
.setup-box { max-width: 420px; margin: 6vh auto 0; width: 100%; }
.setup-box h1 { font-size: 22px; margin: 0 0 4px; }
.setup-box .sub { color: var(--ink-2); font-size: 14px; margin: 0 0 18px; }
.field { display: block; margin: 14px 0; }
.field span { display: block; font-size: 13px; color: var(--ink-2); margin-bottom: 6px; }
.field input {
  width: 100%; padding: 12px 12px; font-size: 16px; border: 1px solid var(--line);
  border-radius: 10px; background: var(--card); color: var(--ink); min-height: 44px;
}
.field input:focus { outline: 2px solid var(--accent); outline-offset: 0; border-color: transparent; }
.help { margin: 14px 0; font-size: 13px; color: var(--ink-2); }
.help summary { cursor: pointer; min-height: 32px; display: flex; align-items: center; }
.help p { margin: 6px 0 0; }
.help code { background: var(--hl); color: var(--hl-ink); padding: 0 4px; border-radius: 4px; font-size: 12px; }

/* ---------- 首页 ---------- */
.home-head { display: flex; justify-content: space-between; align-items: center; padding: 4px 2px; }
.date-line { font-size: 14px; color: var(--ink-2); }
.head-right { display: flex; align-items: center; gap: 8px; }
.streak { font-size: 13px; color: var(--warn); font-weight: 600; }
.icon-btn.syncing { animation: spin 1s linear infinite; display: inline-flex; align-items: center; justify-content: center; }
.home-main { flex: 1; display: flex; flex-direction: column; justify-content: center; gap: 18px; padding-bottom: 20px; }
.today-card {
  background: var(--card); border-radius: 20px; padding: 30px 20px; text-align: center;
  box-shadow: 0 6px 24px rgba(20,24,40,.08); cursor: pointer;
}
.today-card:active { transform: scale(.985); }
.cta-count { font-size: 56px; font-weight: 700; line-height: 1.1; color: var(--accent); }
.cta-count.zero { color: var(--ok); }
.cta-label { font-size: 15px; color: var(--ink-2); margin-top: 2px; }
.cta-sub { font-size: 13px; color: var(--ink-3); margin-top: 10px; }
.home-stats { display: flex; gap: 10px; }
.stat-box { flex: 1; background: var(--card); border-radius: 14px; padding: 12px 8px; text-align: center; }
.stat-box b { display: block; font-size: 20px; }
.stat-box span { font-size: 12px; color: var(--ink-2); }
.home-actions { display: flex; gap: 10px; }
.home-actions .btn { flex: 1; }
.home-foot { text-align: center; font-size: 12px; color: var(--ink-3); padding: 8px 0 2px; }

/* ---------- 复习卡片 ---------- */
.rev-head { display: flex; align-items: center; gap: 10px; padding: 2px 0 10px; }
.rev-progress { flex: 1; height: 6px; background: var(--line); border-radius: 3px; overflow: hidden; }
#rev-bar { height: 100%; width: 0; background: var(--accent); border-radius: 3px; transition: width .25s; }
.rev-count { font-size: 13px; color: var(--ink-2); min-width: 34px; text-align: right; }

.card-area { flex: 1; display: flex; flex-direction: column; justify-content: center; padding: 6px 0; }
.flashcard {
  background: var(--card); border-radius: 20px; padding: 26px 20px;
  box-shadow: 0 6px 24px rgba(20,24,40,.08); cursor: pointer;
  animation: cardIn .25s ease;
  min-height: 46vh; display: flex; flex-direction: column; justify-content: center;
  user-select: none; -webkit-user-select: none;
}
@keyframes cardIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }

.card-front .card-kind { text-align: center; font-size: 12px; color: var(--ink-3); margin-bottom: 14px; letter-spacing: 1px; }
.sent { font-size: 19px; line-height: 1.75; }
.sent .blank {
  display: inline-block; min-width: 3.2em; padding: 0 .35em; margin: 0 .1em;
  border-bottom: 2.5px solid var(--ink-3); text-align: center; color: transparent;
  border-radius: 3px; line-height: 1.3;
}
.sent .blank.reveal { color: var(--hl-ink); background: var(--hl); border-bottom-color: transparent; font-weight: 600; }
.sent .hit { background: var(--hl); color: var(--hl-ink); border-radius: 4px; padding: 1px 3px; font-weight: 600; }
/* 正面提示：目标词完整可见——下划线+加粗（用户反馈挖空无从猜，改为读句回忆） */
.sent .mark { font-weight: 700; text-decoration: underline; text-decoration-thickness: 2.5px; text-underline-offset: 4px; }
.card-hint .mark-demo { font-weight: 700; text-decoration: underline; text-underline-offset: 3px; }
/* 例句来源行：🎬 #归档序号 · 视频标题 */
.b-src, .b-item-src { margin-top: 12px; font-size: 12px; color: var(--ink-3); }
.src-line { display: inline-block; }
.card-hint { text-align: center; margin-top: 18px; font-size: 13px; color: var(--ink-3); }

.word-front { text-align: center; }
.word-front .w { font-size: 40px; font-weight: 700; letter-spacing: .5px; }
.word-front .ph { font-size: 16px; color: var(--ink-2); margin-top: 6px; }
.word-front .hint-zh { margin-top: 16px; font-size: 15px; color: var(--ink-2); }

.card-back .b-word { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-bottom: 2px; }
.card-back .b-word .w { font-size: 30px; font-weight: 700; }
.card-back .ph { font-size: 15px; color: var(--ink-2); }
.card-back .zh { font-size: 16px; margin: 2px 0 10px; }
.card-back .defs { margin: 0 0 12px; padding-left: 18px; font-size: 14px; color: var(--ink-2); }
.card-back .defs li { margin: 3px 0; }
.card-back .b-sec-label { font-size: 12px; color: var(--ink-3); letter-spacing: 1px; margin: 12px 0 6px; }
.card-back .b-ex { background: var(--bg); border-radius: 12px; padding: 12px 14px; }
.card-back .b-ex .sent { font-size: 16px; }
.card-back .b-ex .sent-zh { font-size: 14px; color: var(--ink-2); margin-top: 6px; }
.card-back .b-meta { margin-top: 12px; font-size: 12px; color: var(--ink-3); display: flex; flex-wrap: wrap; gap: 4px 10px; align-items: center; }
.card-back a.ex-link { color: var(--accent); text-decoration: none; font-size: 12px; }

.rev-foot { padding-top: 8px; }
.grade-row { display: flex; gap: 8px; }
.grade-btn {
  flex: 1; border: 1px solid var(--line); border-radius: 14px; background: var(--card);
  padding: 12px 4px; font-size: 15px; cursor: pointer; min-height: 56px;
  display: flex; flex-direction: column; align-items: center; gap: 2px;
}
.grade-btn small { font-size: 11px; color: var(--ink-3); }
.grade-btn:active { opacity: .6; }
.grade-btn.g0 { color: var(--bad); }
.grade-btn.g1 { color: var(--warn); }
.grade-btn.g2 { color: var(--ok); }
.grade-btn.g0 small, .grade-btn.g1 small, .grade-btn.g2 small { color: inherit; opacity: .8; }
.tap-hint { text-align: center; font-size: 13px; color: var(--ink-3); padding: 16px 0 4px; }

/* ---------- 完成 ---------- */
.done-box { flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; }
.done-emoji { font-size: 56px; }
.done-box h1 { font-size: 22px; margin: 8px 0; }
.done-stats { font-size: 15px; color: var(--ink-2); }
.done-stats b { color: var(--ink); }
.done-streak { margin-top: 10px; font-size: 14px; color: var(--warn); font-weight: 600; }

/* ---------- 浏览 ---------- */
.browse-head { display: flex; align-items: center; gap: 8px; padding: 2px 0 10px; }
.browse-head input {
  flex: 1; padding: 10px 12px; font-size: 16px; border: 1px solid var(--line);
  border-radius: 10px; background: var(--card); color: var(--ink); min-height: 44px;
}
.browse-filter { display: flex; gap: 8px; overflow-x: auto; padding-bottom: 10px; }
.chip {
  border: 1px solid var(--line); background: var(--card); color: var(--ink-2);
  border-radius: 999px; padding: 6px 14px; font-size: 13px; cursor: pointer; min-height: 34px;
}
.chip.on { background: var(--accent); border-color: var(--accent); color: #fff; }
.browse-list { flex: 1; overflow-y: auto; }
.b-item {
  background: var(--card); border-radius: 14px; padding: 14px 16px; margin-bottom: 10px;
}
.b-item .b-row1 { display: flex; align-items: baseline; gap: 8px; flex-wrap: wrap; }
.b-item .b-w { font-size: 20px; font-weight: 700; }
.b-item .b-ph { font-size: 13px; color: var(--ink-2); }
.b-item .b-zh { font-size: 14px; margin-top: 3px; }
.b-item .b-ex-preview { font-size: 13px; color: var(--ink-3); margin-top: 6px; overflow: hidden; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; }
.b-item .b-ex-preview .mark { font-weight: 700; text-decoration: underline; text-underline-offset: 2px; }
.b-item details { margin-top: 6px; }
.b-item summary { font-size: 13px; color: var(--accent); cursor: pointer; min-height: 32px; display: flex; align-items: center; }
.b-item .b-ex-full { font-size: 14px; margin: 4px 0 8px; }
.b-item .b-ex-full .sent-zh { font-size: 13px; color: var(--ink-2); margin-top: 2px; display: block; }

/* ---------- 错误 ---------- */
.err-box { flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; }