/* =====================================================================
 * style.css —— 学生端与教师端共用样式
 * 设计取向：手机优先（学生大多用手机）、字号偏大、颜色少、重点突出
 * ===================================================================== */

:root {
  --bg: #f4f6fb;
  --card: #ffffff;
  --ink: #1b2233;
  --ink-2: #5b6478;
  --ink-3: #8d95a8;
  --line: #e5e9f2;
  --brand: #2f6bd8;
  --brand-2: #eaf1ff;
  --good: #17a06a;
  --good-bg: #e8f8f0;
  --mid: #d98a00;
  --mid-bg: #fff5e0;
  --bad: #dc3b45;
  --bad-bg: #ffedee;
  --radius: 15px;
  --shadow: 0 1px 2px rgba(22, 34, 63, .05), 0 8px 22px -12px rgba(22, 34, 63, .18);
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
               "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.62;
  -webkit-text-size-adjust: 100%;
}

.wrap { max-width: 760px; margin: 0 auto; padding: 0 14px 60px; }
.wrap.wide { max-width: 1080px; }

/* ---------------- 顶栏 ---------------- */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  gap: 12px; padding: 14px 0 10px;
}
.brand { display: flex; align-items: center; gap: 10px; min-width: 0; }
.logo {
  width: 38px; height: 38px; border-radius: 11px; flex: 0 0 auto;
  background: linear-gradient(150deg, #4a86ea, #2f5fc4);
  color: #fff; font-weight: 700; font-size: 19px;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 4px 12px -4px rgba(47, 95, 196, .55);
}
.brand-title { font-weight: 700; font-size: 17px; letter-spacing: .2px; }
.brand-sub { font-size: 12px; color: var(--ink-3); margin-top: -3px; }
.who { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--ink-2); }
.who-name { font-weight: 600; color: var(--ink); }
.who-id { background: var(--brand-2); color: var(--brand); border-radius: 6px; padding: 1px 7px; font-size: 12px; }

/* ---------------- 卡片 ---------------- */
.card {
  background: var(--card); border-radius: var(--radius); padding: 18px 16px;
  margin-bottom: 14px; box-shadow: var(--shadow); border: 1px solid rgba(226, 232, 244, .8);
}
.card.tight { padding: 14px 16px; }
.card.center { text-align: center; padding: 40px 20px; }
h1 { font-size: 21px; margin: 0 0 6px; }
h2.sec-title { font-size: 16px; margin: 0 0 12px; letter-spacing: .2px; }
.muted { color: var(--ink-2); margin: 6px 0; }
.muted.small, .small { font-size: 12.5px; }
.privacy {
  font-size: 12px; color: var(--ink-3); text-align: center;
  margin: 18px 8px 0; line-height: 1.7;
}

/* ---------------- 表单与按钮 ---------------- */
.field { display: block; margin: 14px 0; }
.field > span { display: block; font-size: 13px; color: var(--ink-2); margin-bottom: 6px; }
input[type="text"], input[type="date"], select {
  width: 100%; padding: 13px 14px; font-size: 16px; font-family: inherit;
  border: 1.5px solid var(--line); border-radius: 11px; background: #fbfcfe; color: var(--ink);
  transition: border-color .15s, background .15s;
}
input[type="text"]:focus, input[type="date"]:focus, select:focus {
  outline: none; border-color: var(--brand); background: #fff;
}

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 7px;
  padding: 12px 16px; border-radius: 11px; border: 1.5px solid var(--line);
  background: #fff; color: var(--ink); font-size: 15px; font-family: inherit;
  font-weight: 600; cursor: pointer; transition: transform .08s, box-shadow .15s, background .15s;
}
.btn:active { transform: scale(.985); }
.btn.primary { background: var(--brand); border-color: var(--brand); color: #fff; box-shadow: 0 6px 16px -8px rgba(47, 107, 216, .9); }
.btn.ghost { background: #fff; color: var(--ink-2); }
.btn.lg { width: 100%; padding: 15px; font-size: 16.5px; margin-top: 10px; }
.btn.sm { padding: 8px 12px; font-size: 13.5px; }
.btn[disabled] { opacity: .55; cursor: default; }
.link {
  background: none; border: none; color: var(--brand); font-size: 13.5px;
  font-family: inherit; cursor: pointer; padding: 4px 2px;
}
.link.back { margin: 2px 0 10px; font-size: 14px; }
.row-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 12px; }
.row-actions .btn { flex: 1 1 auto; }

/* ---------------- 首页统计 ---------------- */
.stat-row { display: flex; gap: 8px; }
.stat { flex: 1; text-align: center; padding: 6px 2px; }
.stat-n { font-size: 22px; font-weight: 700; color: var(--brand); }
.stat-l { font-size: 12px; color: var(--ink-3); }

/* ---------------- 句子列表 ---------------- */
.sentence-list { display: grid; gap: 10px; }
.sentence-card {
  text-align: left; width: 100%; font-family: inherit; cursor: pointer;
  background: var(--card); border: 1px solid rgba(226, 232, 244, .9);
  border-radius: var(--radius); padding: 14px 15px; box-shadow: var(--shadow);
  transition: transform .08s, border-color .15s;
}
.sentence-card:active { transform: scale(.99); border-color: var(--brand); }
.sc-top { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-bottom: 7px; }
.sc-idx {
  width: 22px; height: 22px; border-radius: 7px; background: var(--brand-2); color: var(--brand);
  font-size: 12.5px; font-weight: 700; display: flex; align-items: center; justify-content: center;
}
.sc-unit { font-size: 12px; color: var(--ink-3); }
.tag {
  font-size: 11.5px; padding: 2px 8px; border-radius: 20px;
  background: #f0f2f7; color: var(--ink-2); margin-left: auto;
}
.tag.good { background: var(--good-bg); color: var(--good); }
.tag.mid { background: var(--mid-bg); color: var(--mid); }
.tag.bad { background: var(--bad-bg); color: var(--bad); }
.sc-text { font-size: 16.5px; font-weight: 600; line-height: 1.5; }
.sc-zh { font-size: 13px; color: var(--ink-3); margin-top: 3px; }

/* ---------------- 练习页 ---------------- */
.target { font-size: 22px; font-weight: 650; line-height: 1.5; margin: 10px 0 6px; letter-spacing: .1px; }
.zh { color: var(--ink-2); font-size: 14px; }
.listen-row { display: flex; gap: 10px; margin-top: 14px; flex-wrap: wrap; }
.listen-row .btn { flex: 1 1 130px; }
.tip {
  margin-top: 14px; padding: 11px 13px; background: #fffaf0; border-left: 3px solid #f0b23c;
  border-radius: 8px; font-size: 13.5px; color: #7a5a10;
}

.record-card { text-align: center; }
.record-card canvas { width: 100%; height: 90px; display: block; border-radius: 10px; background: #fafbfe; }
.rec-status { font-size: 13.5px; color: var(--ink-2); margin: 12px 0 2px; min-height: 21px; }
.timer { font-size: 26px; font-weight: 700; font-variant-numeric: tabular-nums; color: var(--ink); margin-bottom: 8px; }
.btn.rec { background: var(--brand); border-color: var(--brand); color: #fff; }
.btn.rec.recording { background: var(--bad); border-color: var(--bad); animation: pulse 1.2s infinite; }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: .72; } }
.rec-actions { display: flex; gap: 10px; justify-content: center; margin-top: 12px; flex-wrap: wrap; }

/* ---------------- 结果页 ---------------- */
.score-head { display: flex; align-items: center; gap: 18px; }
.ring {
  --pct: 0;
  width: 112px; height: 112px; border-radius: 50%; flex: 0 0 auto;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  background:
    radial-gradient(closest-side, #fff 79%, transparent 80% 100%),
    conic-gradient(var(--ring-color, var(--brand)) calc(var(--pct) * 1%), #e9edf6 0);
}
.ring.good { --ring-color: var(--good); }
.ring.mid { --ring-color: var(--mid); }
.ring.bad { --ring-color: var(--bad); }
.ring-n { font-size: 30px; font-weight: 750; line-height: 1; }
.ring-l { font-size: 11.5px; color: var(--ink-3); margin-top: 3px; }
.score-side { flex: 1; min-width: 0; }
.kv { display: flex; justify-content: space-between; font-size: 14px; padding: 3px 0; border-bottom: 1px dashed var(--line); }
.kv:last-child { border-bottom: none; }
.kv span { color: var(--ink-2); }
.notice {
  margin-top: 14px; padding: 10px 12px; background: var(--mid-bg); color: #8a5a00;
  border-radius: 9px; font-size: 12.5px; line-height: 1.6;
}
.words-line { margin-top: 14px; line-height: 2.4; }
.w {
  display: inline-block; padding: 1px 7px; margin: 0 2px 4px 0; border-radius: 7px;
  background: #f2f4f9; font-size: 15px;
}
.w b { font-size: 11px; font-weight: 700; margin-left: 4px; opacity: .8; }
.w-good { background: var(--good-bg); color: #0d6b47; }
.w-mid { background: var(--mid-bg); color: #8a5a00; }
.w-bad { background: var(--bad-bg); color: #a11f28; }

.weak-item { padding: 13px 0; border-top: 1px solid var(--line); }
.weak-item:first-of-type { border-top: none; padding-top: 4px; }
.weak-head { display: flex; align-items: center; gap: 9px; margin-bottom: 6px; flex-wrap: wrap; }
.ipa {
  font-family: "SF Mono", "Consolas", monospace; font-size: 17px; font-weight: 700;
  color: var(--brand); background: var(--brand-2); padding: 2px 9px; border-radius: 7px;
}
.ipa.small { font-size: 14px; }
.weak-name { font-size: 13px; color: var(--ink-2); }
.weak-score { margin-left: auto; font-size: 13px; font-weight: 700; padding: 2px 9px; border-radius: 20px; }
.weak-score.good { background: var(--good-bg); color: var(--good); }
.weak-score.mid { background: var(--mid-bg); color: var(--mid); }
.weak-score.bad { background: var(--bad-bg); color: var(--bad); }
.weak-line { margin: 5px 0; font-size: 14px; line-height: 1.65; }
.weak-line b { color: var(--ink); }

.all-good { display: flex; gap: 12px; align-items: flex-start; }
.all-good .tick {
  width: 34px; height: 34px; border-radius: 50%; background: var(--good); color: #fff;
  display: flex; align-items: center; justify-content: center; font-size: 19px; flex: 0 0 auto;
}
.all-good p { margin: 2px 0 0; }

.practice-item {
  padding: 13px 14px; border: 1px solid var(--line); border-radius: 12px; margin-bottom: 10px;
  background: #fcfdff;
}
.practice-item:last-child { margin-bottom: 0; }
.pi-head { display: flex; align-items: center; gap: 8px; margin-bottom: 6px; }
.pi-text { font-size: 16.5px; font-weight: 600; line-height: 1.55; }
.pi-zh { font-size: 13px; color: var(--ink-3); margin-top: 3px; }
.pi-actions { display: flex; gap: 8px; margin-top: 10px; }

/* ---------------- 表格 ---------------- */
.table-wrap { overflow-x: auto; margin: 0 -4px; }
.data-table { width: 100%; border-collapse: collapse; font-size: 13.5px; }
.data-table th, .data-table td { padding: 9px 8px; text-align: left; border-bottom: 1px solid var(--line); white-space: nowrap; }
.data-table th { color: var(--ink-3); font-weight: 600; font-size: 12.5px; background: #fafbfe; }
.data-table td.cell-text { white-space: normal; min-width: 180px; }
.cell-score { font-weight: 700; }
td.good, .good { color: var(--good); }
td.mid, .mid { color: var(--mid); }
td.bad, .bad { color: var(--bad); }
.chip {
  display: inline-block; font-size: 11.5px; padding: 1px 7px; border-radius: 20px;
  background: var(--bad-bg); color: var(--bad); margin-right: 4px;
}

/* ---------------- 载入动画 ---------------- */
.spinner {
  width: 42px; height: 42px; margin: 0 auto 16px; border-radius: 50%;
  border: 4px solid var(--brand-2); border-top-color: var(--brand);
  animation: spin .9s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------------- 提示条 ---------------- */
#toast {
  position: fixed; left: 50%; bottom: 28px; transform: translate(-50%, 20px);
  background: rgba(24, 30, 44, .94); color: #fff; padding: 12px 18px; border-radius: 11px;
  font-size: 14px; max-width: min(88vw, 460px); text-align: center; line-height: 1.55;
  opacity: 0; pointer-events: none; transition: opacity .22s, transform .22s; z-index: 99;
}
#toast.show { opacity: 1; transform: translate(-50%, 0); }

/* ---------------- 教师端 ---------------- */
.teach-grid { display: grid; gap: 14px; grid-template-columns: 1fr; }
@media (min-width: 860px) { .teach-grid.two { grid-template-columns: 1fr 1fr; } }
.filters { display: flex; gap: 10px; flex-wrap: wrap; align-items: flex-end; }
.filters .field { margin: 0; flex: 1 1 150px; }
.badge-warn { background: var(--mid-bg); color: #8a5a00; font-size: 12px; padding: 3px 9px; border-radius: 20px; }
.miss-list { display: flex; flex-wrap: wrap; gap: 6px; }
.miss-item { font-size: 13px; padding: 3px 9px; border-radius: 20px; background: #f0f2f7; color: var(--ink-2); }
.miss-item.ok { background: var(--good-bg); color: var(--good); }
.bar-row { display: flex; align-items: center; gap: 9px; margin: 7px 0; font-size: 13.5px; }
.bar-label {
  width: 78px; flex: 0 0 auto; font-family: "SF Mono", "Consolas", monospace;
  color: var(--brand); font-weight: 700; font-size: 13px; white-space: nowrap;
  overflow: hidden; text-overflow: ellipsis;
}
.bar-track { flex: 1; height: 12px; background: #eef1f7; border-radius: 20px; overflow: hidden; }
/* 注意：这一条必须是 block/inline-block。span 默认是 inline，
   给 inline 元素设 width/height 会被忽略，进度条会变成空条子（踩过这个坑）。 */
.bar-fill { display: block; height: 100%; border-radius: 20px; background: var(--brand); }
/* 等级配色写在 .bar-fill 之后，否则会被上面的 background 覆盖 */
.bar-fill.bad { background: var(--bad); }
.bar-fill.mid { background: var(--mid); }
.bar-fill.good { background: var(--good); }
.bar-val { width: 92px; flex: 0 0 auto; text-align: right; color: var(--ink-2); font-size: 12.5px; }
.spark { display: block; width: 100%; height: 46px; }
.empty { text-align: center; padding: 30px 10px; color: var(--ink-3); }

/* ---------------- 兜底提示（file:// 打开时） ---------------- */
.banner {
  background: #fff8e6; border: 1px solid #f0d79a; color: #7a5a10;
  padding: 11px 13px; border-radius: 11px; font-size: 13px; margin-bottom: 12px; line-height: 1.6;
}

/* =====================================================================
 * 三类课程（单词 / 短语 / 句子）—— 首页 Tab 与单词音素网格
 * ===================================================================== */

.course-tabs {
  display: flex; gap: 8px; margin-bottom: 10px;
  background: #f2f5fb; padding: 5px; border-radius: 13px;
}
.course-tab {
  flex: 1; display: flex; flex-direction: column; align-items: center; gap: 1px;
  padding: 9px 4px; border: none; background: transparent; cursor: pointer;
  border-radius: 10px; font-family: inherit; color: var(--ink-2);
  transition: background .15s, color .15s, box-shadow .15s;
}
.course-tab.on {
  background: #fff; color: var(--brand); font-weight: 700;
  box-shadow: 0 2px 8px -3px rgba(22, 34, 63, .22);
}
.ct-icon { font-size: 17px; line-height: 1.1; }
.ct-name { font-size: 14.5px; }
.ct-prog { font-size: 11px; color: var(--ink-3); font-variant-numeric: tabular-nums; }
.course-tab.on .ct-prog { color: var(--brand); }
.course-sub { margin: 2px 0 12px; }

/* 卡片上的"训练 /θ/"小标 */
.sc-focus {
  font-size: 11.5px; padding: 2px 8px; border-radius: 20px;
  background: var(--brand-2); color: var(--brand);
  font-family: "SF Mono", "Consolas", monospace;
}
.sc-text.sc-word { font-size: 22px; letter-spacing: .4px; }
.target.target-word { font-size: 33px; text-align: center; letter-spacing: 1px; margin: 14px 0 8px; }

/* 练习页：这个词由哪几个音组成 */
.ph-hint { margin-top: 9px; line-height: 2; }
.chip-light {
  display: inline-block; font-size: 12.5px; padding: 1px 8px; margin: 0 4px 3px 0;
  border-radius: 20px; background: #f0f2f7; color: var(--ink-2);
  font-family: "SF Mono", "Consolas", monospace;
}

/* 单词结果页：逐音素网格 */
.ph-grid {
  display: grid; gap: 8px; margin-top: 6px;
  grid-template-columns: repeat(auto-fit, minmax(66px, 1fr));
}
.ph-cell {
  border-radius: 12px; padding: 9px 4px; text-align: center; border: 1.5px solid transparent;
}
.ph-cell .ph-idx { font-size: 10.5px; color: var(--ink-3); }
.ph-cell .ph-ipa {
  font-family: "SF Mono", "Consolas", monospace; font-size: 17px; font-weight: 700;
  margin: 2px 0; word-break: break-all;
}
.ph-cell .ph-score { font-size: 13px; font-weight: 700; font-variant-numeric: tabular-nums; }
.ph-good { background: var(--good-bg); border-color: #b6e6cf; }
.ph-good .ph-ipa, .ph-good .ph-score { color: #0d6b47; }
.ph-mid { background: var(--mid-bg); border-color: #f3dca6; }
.ph-mid .ph-ipa, .ph-mid .ph-score { color: #8a5a00; }
.ph-bad { background: var(--bad-bg); border-color: #f5c2c6; }
.ph-bad .ph-ipa, .ph-bad .ph-score { color: #a11f28; }

/* 云端同步状态小标 */
.cloud-badge {
  font-size: 11px; padding: 2px 8px; border-radius: 20px; white-space: nowrap;
  background: #f0f2f7; color: var(--ink-3);
}
.cloud-badge.ok { background: var(--good-bg); color: var(--good); }
.cloud-badge.pending { background: var(--mid-bg); color: #8a5a00; }
.cloud-badge.local { background: #f0f2f7; color: var(--ink-3); }

/* 失败页里的目标句：小一号，不抢视线 */
.target.small-target {
  font-size: 17px; text-align: left; margin: 12px 0 4px;
  padding: 10px 12px; background: #f7f9fd; border-radius: 10px;
}

/* 结果页的"听一听对比" */
.compare-row { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 10px; }
.compare-item {
  flex: 1 1 200px; padding: 12px 14px; border: 1px solid var(--line);
  border-radius: 12px; background: #fcfdff;
}
.compare-title { font-size: 13px; font-weight: 600; color: var(--ink-2); margin-bottom: 8px; }
.compare-item .btn { margin-right: 6px; margin-bottom: 6px; }