/* 背词小天才 · 网页版样式
   设计取向：浅色、留白、卡片化；桌面优先，窗口窄时自动堆叠 */

:root {
  --bg: #f4f7ff;
  --card: #ffffff;
  --ink: #1f2740;
  --ink-2: #4a5573;
  --muted: #8a94ad;
  --line: #e6ecfa;
  --blue: #4e7bff;
  --blue-dark: #3a63e0;
  --blue-soft: #eef3ff;
  --green: #21a675;
  --green-soft: #e8f8f1;
  --red: #e2544c;
  --red-soft: #fdeceb;
  --amber: #d99100;
  --radius: 16px;
  --shadow: 0 6px 24px rgba(35, 61, 120, 0.07);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--blue); text-decoration: none; }
button { font-family: inherit; }
input, select, textarea { font-family: inherit; font-size: inherit; }

/* ---------- 顶栏 ---------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(160%) blur(12px);
  border-bottom: 1px solid var(--line);
}
.topbar-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 12px 24px;
  display: flex;
  align-items: center;
  gap: 24px;
}
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); }
.brand-logo {
  width: 40px; height: 40px;
  display: grid; place-items: center;
  background: linear-gradient(140deg, #e8efff, #f1e9ff);
  border-radius: 12px;
  font-size: 21px;
}
.brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.brand-text strong { font-size: 17px; letter-spacing: .5px; }
.brand-text small { color: var(--muted); font-size: 11px; }

.nav { display: flex; gap: 4px; flex: 1; }
.nav a {
  padding: 8px 14px;
  border-radius: 10px;
  color: var(--ink-2);
  font-size: 14.5px;
}
.nav a:hover { background: var(--blue-soft); color: var(--blue-dark); }
.nav a.on { background: var(--blue); color: #fff; font-weight: 600; }

.bank-switch { display: flex; align-items: center; gap: 8px; color: var(--muted); font-size: 13px; }
.bank-switch select {
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  color: var(--ink);
  max-width: 220px;
  cursor: pointer;
}
.bank-switch select:focus { outline: 2px solid #cfdcff; border-color: var(--blue); }

/* ---------- 布局 ---------- */
.view { max-width: 1180px; margin: 0 auto; padding: 26px 24px 40px; min-height: 62vh; }
.footer {
  max-width: 1180px;
  margin: 0 auto;
  padding: 18px 24px 40px;
  color: var(--muted);
  font-size: 12.5px;
}
.footer .dot { margin: 0 8px; }
.loading { color: var(--muted); padding: 80px 0; text-align: center; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 22px 24px;
  margin-bottom: 18px;
}
.card.tight { padding: 18px 20px; }

.hero {
  background: linear-gradient(135deg, #eaf1ff, #f4ecff 70%);
  border: 1px solid #e2e9ff;
  border-radius: var(--radius);
  padding: 26px 28px;
  margin-bottom: 18px;
}
.hero h1 { margin: 0 0 6px; font-size: 24px; letter-spacing: .3px; }
.hero p { margin: 0; color: var(--ink-2); font-size: 14px; }
.hero-row { display: flex; align-items: center; justify-content: space-between; gap: 20px; flex-wrap: wrap; }

.section-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 700;
  color: var(--ink-2);
  margin: 0 0 12px;
}
.section-title .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--blue); }
.muted { color: var(--muted); }
.small { font-size: 12.5px; }
.center { text-align: center; }
.mt { margin-top: 14px; }
.mb0 { margin-bottom: 0; }

/* ---------- 数据卡 ---------- */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-bottom: 18px; }
.stat {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 16px 18px;
}
.stat .num { font-size: 26px; font-weight: 700; line-height: 1.2; }
.stat .lab { color: var(--muted); font-size: 12.5px; margin-top: 2px; }
.stat.blue .num { color: var(--blue); }
.stat.green .num { color: var(--green); }
.stat.amber .num { color: var(--amber); }
.stat.red .num { color: var(--red); }

/* ---------- 按钮 ---------- */
.btn, .btn-primary, .btn-ghost, .btn-mini {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  border: none;
  border-radius: 12px;
  cursor: pointer;
  transition: transform .06s ease, background .15s ease, box-shadow .15s ease;
  white-space: nowrap;
}
.btn-primary {
  background: var(--blue);
  color: #fff;
  padding: 11px 22px;
  font-size: 15px;
  font-weight: 600;
  box-shadow: 0 6px 16px rgba(78, 123, 255, .25);
}
.btn-primary:hover { background: var(--blue-dark); }
.btn-primary:active { transform: translateY(1px); }
.btn-ghost {
  background: #fff;
  color: var(--ink-2);
  border: 1px solid var(--line);
  padding: 10px 18px;
  font-size: 14px;
}
.btn-ghost:hover { border-color: #cfd9f5; background: #fafbff; color: var(--blue-dark); }
.btn-mini {
  background: var(--blue-soft);
  color: var(--blue-dark);
  padding: 5px 10px;
  font-size: 12.5px;
  border-radius: 8px;
}
.btn-mini:hover { background: #dfe8ff; }
.btn:disabled, button:disabled { opacity: .5; cursor: not-allowed; }
.btn-row { display: flex; gap: 10px; flex-wrap: wrap; }
.btn-row.end { justify-content: flex-end; }

/* ---------- chips ---------- */
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  padding: 6px 13px;
  border-radius: 999px;
  background: #f5f8ff;
  border: 1px solid #e6ecfa;
  color: var(--ink-2);
  font-size: 13px;
  cursor: pointer;
  user-select: none;
}
.chip:hover { border-color: #cdd9f7; }
.chip.on { background: var(--blue); border-color: var(--blue); color: #fff; font-weight: 600; }
.chip.ghost { background: transparent; }

/* ---------- 词库卡 ---------- */
.bank-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.bank-card {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 16px 18px;
  background: #fff;
  cursor: pointer;
  transition: border-color .15s, box-shadow .15s, transform .1s;
}
.bank-card:hover { border-color: #c9d7ff; box-shadow: 0 8px 20px rgba(60, 90, 170, .08); }
.bank-card.on { border-color: var(--blue); background: linear-gradient(160deg, #f6f9ff, #fff); }
.bank-card .b-title { display: flex; align-items: center; gap: 8px; font-weight: 700; font-size: 15.5px; }
.bank-card .b-meta { color: var(--muted); font-size: 12.5px; margin-top: 6px; }
.bank-card .b-bar { height: 6px; background: #eef2fc; border-radius: 99px; margin-top: 12px; overflow: hidden; }
.bank-card .b-bar i { display: block; height: 100%; background: linear-gradient(90deg, #6d94ff, #9d7bff); }

/* ---------- 背诵卡 ---------- */
.study-wrap { max-width: 760px; margin: 0 auto; }
.study-bar { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 14px; }
.progress { flex: 1; height: 8px; background: #e9eefb; border-radius: 99px; overflow: hidden; }
.progress i { display: block; height: 100%; background: linear-gradient(90deg, #5c86ff, #8f6cff); transition: width .25s; }

.word-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 20px;
  box-shadow: var(--shadow);
  padding: 40px 36px 30px;
  text-align: center;
}
.word-card .the-word { font-size: 44px; font-weight: 700; letter-spacing: .5px; line-height: 1.25; word-break: break-word; }
.word-card .phonetic { color: var(--muted); font-size: 17px; margin-top: 8px; font-family: "Arial", sans-serif; }
.speak-btn {
  margin-top: 14px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 18px;
  border-radius: 999px;
  border: 1px solid #dbe5ff;
  background: #f7faff;
  color: var(--blue-dark);
  cursor: pointer;
  font-size: 14px;
}
.speak-btn.playing { background: var(--blue); color: #fff; border-color: var(--blue); }

.reveal-btn {
  margin: 26px auto 0;
  max-width: 420px;
  padding: 15px;
  border-radius: 14px;
  border: 2px dashed #d5e0ff;
  background: #f8faff;
  color: #6b8cff;
  font-weight: 600;
  cursor: pointer;
  text-align: center;
}
.reveal-btn:hover { background: #f2f7ff; border-color: #bfd0ff; }
.reveal-hint { color: var(--muted); font-size: 12px; margin-top: 8px; }

.detail { text-align: left; margin-top: 26px; animation: fade .18s ease; }
@keyframes fade { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }
.detail .d-mean { font-size: 19px; font-weight: 600; line-height: 1.6; }
.detail .d-block { margin-top: 18px; padding-top: 16px; border-top: 1px dashed var(--line); }
.detail .d-label { color: var(--muted); font-size: 12.5px; margin-bottom: 8px; letter-spacing: .5px; }
.phr-item { display: flex; gap: 10px; padding: 4px 0; font-size: 14.5px; }
.phr-item .en { color: var(--ink); font-weight: 600; }
.phr-item .cn { color: var(--muted); }
.example { font-size: 15px; }
.example-cn { color: var(--ink-2); font-size: 14px; margin-top: 4px; }

.study-actions { display: flex; gap: 12px; margin-top: 22px; }
.study-actions .btn-ghost { flex: 1; padding: 14px; font-size: 15px; }
.study-actions .btn-primary { flex: 1.4; padding: 14px; font-size: 15px; }
.btn-warn { background: #fff2f1; color: #c9413a; border: 1px solid #ffd9d6; }

/* ---------- 测验 ---------- */
.mode-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.mode-card {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 16px;
  background: #fff;
  cursor: pointer;
}
.mode-card:hover { border-color: #c9d7ff; }
.mode-card.on { border-color: var(--blue); background: #f7faff; box-shadow: 0 6px 16px rgba(78, 123, 255, .1); }
.mode-card .m-icon { font-size: 22px; }
.mode-card .m-title { font-weight: 700; margin-top: 6px; }
.mode-card .m-desc { color: var(--muted); font-size: 12.5px; margin-top: 2px; line-height: 1.5; }

.quiz-shell { max-width: 780px; margin: 0 auto; }
.timer { height: 6px; background: #eef2fc; border-radius: 99px; overflow: hidden; margin-bottom: 16px; }
.timer i { display: block; height: 100%; background: var(--blue); transition: width .2s linear; }
.timer.low i { background: var(--red); }

.q-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: var(--shadow);
  padding: 34px 32px;
}
.q-head { display: flex; justify-content: space-between; color: var(--muted); font-size: 13px; }
.q-word { font-size: 40px; font-weight: 700; text-align: center; margin: 18px 0 6px; word-break: break-word; }
.q-phonetic { text-align: center; color: var(--muted); font-size: 16px; }
.q-ask { text-align: center; color: var(--ink-2); margin-top: 14px; font-size: 14px; }

.options { display: grid; gap: 10px; margin-top: 24px; }
.option {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  cursor: pointer;
  font-size: 15px;
  text-align: left;
}
.option:hover { border-color: #c9d7ff; background: #fafbff; }
.option .k {
  width: 24px; height: 24px;
  flex: 0 0 24px;
  display: grid; place-items: center;
  border-radius: 7px;
  background: #f0f4ff;
  color: var(--blue-dark);
  font-size: 12.5px;
  font-weight: 700;
}
.option.right { border-color: #9be0c5; background: var(--green-soft); }
.option.right .k { background: #d5f5e9; color: var(--green); }
.option.wrong { border-color: #ffc9c4; background: var(--red-soft); }
.option.wrong .k { background: #ffe0dd; color: var(--red); }
.option.dim { opacity: .55; }

.spell-box { margin-top: 24px; }
.spell-hint { text-align: center; color: var(--blue-dark); background: #f2f7ff; border-radius: 10px; padding: 10px; font-size: 15px; letter-spacing: 1px; margin-bottom: 12px; }
.spell-input {
  width: 100%;
  padding: 15px 18px;
  font-size: 22px;
  letter-spacing: 1px;
  text-align: center;
  border: 2px solid #dbe5ff;
  border-radius: 14px;
  outline: none;
}
.spell-input:focus { border-color: var(--blue); box-shadow: 0 0 0 4px rgba(78, 123, 255, .12); }
.feedback { margin-top: 14px; font-size: 14px; text-align: center; }
.feedback.ok { color: var(--green); }
.feedback.no { color: var(--red); }

/* ---------- 词库表格 ---------- */
.toolbar { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; margin-bottom: 14px; }
.search {
  flex: 1;
  min-width: 220px;
  padding: 11px 16px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  outline: none;
}
.search:focus { border-color: var(--blue); box-shadow: 0 0 0 3px rgba(78, 123, 255, .1); }

.table { width: 100%; border-collapse: collapse; font-size: 14.5px; }
.table th, .table td { padding: 10px 12px; border-bottom: 1px solid #eef2fb; text-align: left; vertical-align: middle; }
.table th { color: var(--muted); font-size: 12.5px; font-weight: 600; background: #fafbff; position: sticky; top: 68px; }
.table tr:hover td { background: #fafbff; }
.table td.no { color: var(--muted); width: 54px; }
.table td.wd { font-weight: 600; width: 210px; }
.table td.ph { color: var(--muted); width: 180px; font-family: Arial, sans-serif; }
.table td.pos { color: var(--ink-2); width: 80px; }
.table .row-speak { border: none; background: transparent; cursor: pointer; color: var(--blue); font-size: 15px; }
.table-wrap { max-height: 62vh; overflow: auto; border: 1px solid var(--line); border-radius: 14px; background: #fff; }
.empty { padding: 50px 0; text-align: center; color: var(--muted); }

/* ---------- 生成器 ---------- */
.gen-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.gen-card {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 16px 18px;
  background: linear-gradient(150deg, #f4f8ff, #f8f3ff);
  cursor: pointer;
}
.gen-card:hover { border-color: #c9d7ff; }
.gen-card .g-head { display: flex; align-items: center; gap: 8px; font-weight: 700; }
.gen-card .g-desc { color: var(--ink-2); font-size: 12.5px; margin-top: 6px; line-height: 1.55; }

.wall { display: grid; grid-template-columns: repeat(auto-fill, minmax(168px, 1fr)); gap: 10px; }
.wall-cell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  cursor: pointer;
  font-size: 16px;
  font-weight: 600;
}
.wall-cell:hover { border-color: #c9d7ff; background: #fafcff; }
.wall-cell.playing { background: var(--blue); color: #fff; border-color: var(--blue); }

.sheet-table { width: 100%; border-collapse: collapse; font-size: 14.5px; }
.sheet-table th, .sheet-table td { padding: 9px 10px; border-bottom: 1px solid #eef2fb; text-align: left; }
.sheet-table th { color: var(--muted); font-size: 12.5px; background: #fafbff; }
.sheet-table td.w { font-weight: 600; width: 200px; }
.sheet-table td.p { color: var(--muted); width: 160px; font-family: Arial, sans-serif; }

.paper { background: #fff; border: 1px solid var(--line); border-radius: 14px; padding: 26px 30px; }
.paper-head { color: var(--ink-2); border-bottom: 1px dashed var(--line); padding-bottom: 12px; margin-bottom: 6px; }
.paper-item { padding: 12px 0 6px; }
.p-cue { font-size: 15.5px; }
.p-no { color: var(--muted); margin-right: 6px; }
.p-hint { color: var(--muted); font-size: 13px; margin-left: 6px; }
.p-blank {
  height: 30px;
  margin-left: 26px;
  border-bottom: 1.5px solid #c9d2e6;
  color: var(--blue-dark);
  letter-spacing: 1px;
  font-family: Arial, sans-serif;
  padding-left: 2px;
  line-height: 30px;
}
.p-ans { color: var(--green); font-size: 13.5px; margin-left: 26px; margin-top: 2px; }

/* ---------- 我的 ---------- */
.kv { display: grid; grid-template-columns: 140px 1fr; gap: 10px 18px; font-size: 14px; }
.kv .k { color: var(--muted); }
.list { margin: 0; padding: 0; list-style: none; }
.list li { padding: 9px 0; border-bottom: 1px solid #f1f4fc; display: flex; justify-content: space-between; gap: 12px; font-size: 14px; }
.list li:last-child { border-bottom: none; }
.list .w { font-weight: 600; }
.list .m { color: var(--muted); font-size: 13px; }
.tag { display: inline-block; padding: 1px 8px; border-radius: 6px; background: var(--blue-soft); color: var(--blue-dark); font-size: 12px; }
.tag.red { background: var(--red-soft); color: #c9413a; }
.tag.green { background: var(--green-soft); color: var(--green); }

/* ---------- toast ---------- */
.toast {
  position: fixed;
  left: 50%;
  bottom: 44px;
  transform: translateX(-50%) translateY(20px);
  background: rgba(31, 39, 64, .92);
  color: #fff;
  padding: 11px 20px;
  border-radius: 12px;
  font-size: 14px;
  opacity: 0;
  pointer-events: none;
  transition: opacity .18s, transform .18s;
  z-index: 80;
  max-width: 82vw;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ---------- 响应式 ---------- */
@media (max-width: 980px) {
  .stats { grid-template-columns: repeat(2, 1fr); }
  .bank-grid { grid-template-columns: repeat(2, 1fr); }
  .mode-grid { grid-template-columns: repeat(2, 1fr); }
  .nav { overflow-x: auto; }
  .nav a { white-space: nowrap; }
}
@media (max-width: 720px) {
  .topbar-inner { flex-wrap: wrap; gap: 10px; padding: 10px 16px; }
  .nav { order: 3; width: 100%; }
  .bank-switch { margin-left: auto; }
  .view { padding: 18px 14px 30px; }
  .word-card { padding: 30px 20px 24px; }
  .word-card .the-word { font-size: 34px; }
  .gen-grid { grid-template-columns: 1fr; }
  .table th { top: 0; }
  .kv { grid-template-columns: 100px 1fr; }
}