/* style.css — 简洁学习风 */
:root {
  --bg: #fafaf7;
  --surface: #ffffff;
  --text: #1f2328;
  --muted: #6e7681;
  --border: #e5e7eb;
  --accent: #2563eb;
  --accent-soft: #dbeafe;
  --l1: #fde68a;
  --l2: #fcd34d;
  --l3: #fbbf24;
  --l4: #f59e0b;
  --l5: #16a34a;
  --shadow: 0 1px 2px rgba(0,0,0,.04), 0 4px 12px rgba(0,0,0,.03);
}

* { box-sizing: border-box; }

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

/* topbar */
.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 12px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  backdrop-filter: blur(6px);
}
.brand { font-weight: 600; font-size: 16px; }
.stats { font-size: 13px; color: var(--muted); }

.container {
  max-width: 980px;
  margin: 0 auto;
  padding: 24px;
}

/* hero */
.hero h1 {
  font-size: 28px;
  margin: 16px 0 4px;
  letter-spacing: -0.5px;
}
.hero .subtitle { color: var(--muted); margin: 0 0 24px; }

/* progress */
.progress-block {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 24px;
  box-shadow: var(--shadow);
}
.progress-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}
.progress-row .label { font-size: 14px; color: var(--muted); min-width: 60px; }
.bar {
  flex: 1;
  height: 8px;
  background: var(--border);
  border-radius: 4px;
  overflow: hidden;
}
.bar-fill {
  height: 100%;
  background: var(--accent);
  width: 0%;
  transition: width .4s;
}
.pct { font-size: 13px; color: var(--muted); min-width: 44px; text-align: right; }

.block-label {
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 8px;
  letter-spacing: .3px;
}

/* 首页练习模式选择 */
.mode-picker {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px;
  margin-bottom: 16px;
}
.mode-picker-chips {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 10px;
}
.mode-chip {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px;
  cursor: pointer;
  background: var(--bg);
  transition: border-color .15s, background .15s, color .15s;
}
.mode-chip:hover { border-color: var(--accent); }
.mode-chip.active {
  border-color: var(--accent);
  background: var(--accent-soft);
}
.mode-chip .mc-name { font-size: 15px; font-weight: 600; color: var(--text); }
.mode-chip.active .mc-name { color: var(--accent); }
.mode-chip .mc-desc { font-size: 12px; color: var(--muted); margin-top: 2px; }
.mode-chip .mc-meta { font-size: 11px; color: var(--accent); margin-top: 6px; }
.start-btn {
  margin-top: 14px;
  width: 100%;
  border: none;
  background: var(--accent);
  color: #fff;
  border-radius: 10px;
  padding: 13px 0;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
}
.start-btn:hover { opacity: .92; }

/* 练习范围（全部 / 只练未掌握） */
.drill-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 12px;
}
.drill-chip {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 16px;
  cursor: pointer;
  background: var(--bg);
  font-size: 13px;
  color: var(--text);
  transition: border-color .15s, background .15s, color .15s;
}
.drill-chip:hover { border-color: var(--accent); }
.drill-chip.active {
  border-color: var(--accent);
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 600;
}
.due-note {
  margin-top: 12px;
  font-size: 12px;
  color: var(--muted);
}
.due-note b { color: var(--accent); font-size: 14px; }

/* 顺序 / 乱序 */
.order-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 14px;
}
.order-chips {
  display: flex;
  gap: 8px;
}
.order-chip {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 16px;
  cursor: pointer;
  background: var(--bg);
  font-size: 13px;
  color: var(--text);
  transition: border-color .15s, background .15s, color .15s;
}
.order-chip:hover { border-color: var(--accent); }
.order-chip.active {
  border-color: var(--accent);
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 600;
}

/* 学习页当前模式标签 */
.mode-label {
  font-size: 12px;
  color: var(--accent);
  font-weight: 600;
}
.levels {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.level-group + .level-group { margin-top: 12px; }
.level-sub {
  font-size: 11px;
  color: var(--muted);
  margin-bottom: 6px;
  letter-spacing: .3px;
}
.level-row { display: flex; gap: 8px; flex-wrap: wrap; }
.level-chip {
  flex: 1;
  min-width: 84px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  text-align: center;
}
.level-chip .name { font-weight: 600; font-size: 13px; }
.level-chip .count { font-size: 12px; color: var(--muted); margin-top: 2px; }

/* letter nav */
.letter-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 16px;
}
.letter-nav button {
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: 6px;
  min-width: 36px;
  height: 36px;
  width: auto;
  padding: 0 8px;
  font-size: 14px;
  cursor: pointer;
  font-family: inherit;
  color: var(--text);
}
.letter-nav button.active {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}
.letter-nav button:hover:not(.active) { background: var(--accent-soft); border-color: var(--accent); }

/* filters */
.filters {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}
.filters input,
.filters select,
.filters .ghost {
  height: 40px;
  padding: 0 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface);
  font-size: 14px;
  font-family: inherit;
  outline: none;
}
.filters input { flex: 1; min-width: 180px; }
.filters select { cursor: pointer; }
.filters input:focus, .filters select:focus { border-color: var(--accent); }
.filters .ghost {
  background: transparent;
  cursor: pointer;
  font-size: 13px;
  color: var(--muted);
}
.filters .ghost:hover { color: #dc2626; border-color: #dc2626; }

/* word list */
.word-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 8px;
}
.word-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 14px;
  cursor: pointer;
  transition: transform .15s, border-color .15s;
  position: relative;
  text-decoration: none;
  color: var(--text);
  display: block;
}
.word-card:hover { transform: translateY(-1px); border-color: var(--accent); }
.word-card .name {
  font-weight: 600;
  font-size: 18px;
  margin-bottom: 3px;
  letter-spacing: -.2px;
  color: var(--text);
}
.word-card .phonetic {
  font-size: 12px;
  color: var(--muted);
  font-family: "Lucida Sans Unicode", "Arial Unicode MS", serif;
  margin-bottom: 5px;
}
.word-card .meaning {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.5;
}
.word-card .level-dot {
  position: absolute;
  top: 10px;
  right: 10px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--border);
}
.word-card[data-level="1"] .level-dot { background: var(--l1); }
.word-card[data-level="2"] .level-dot { background: var(--l2); }
.word-card[data-level="3"] .level-dot { background: var(--l3); }
.word-card[data-level="4"] .level-dot { background: var(--l4); }
.word-card[data-level="5"] .level-dot { background: var(--l5); }

.empty {
  grid-column: 1 / -1;
  text-align: center;
  color: var(--muted);
  padding: 40px;
  font-size: 14px;
}

/* learn page */
.learn-wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 24px;
}

.flashcard {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 30px 24px;
  text-align: center;
  box-shadow: var(--shadow);
  min-height: 200px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  position: relative;
}
.flashcard .word-head {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-bottom: 4px;
}
.flashcard .w {
  font-size: 38px;
  font-weight: 700;
  letter-spacing: -1px;
}
.flashcard .speak {
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: 50%;
  width: 38px;
  height: 38px;
  font-size: 18px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background .15s, border-color .15s;
}
.flashcard .speak:hover {
  background: var(--accent-soft);
  border-color: var(--accent);
}
.flashcard .ph {
  font-size: 15px;
  color: var(--muted);
  font-family: "Lucida Sans Unicode", "Arial Unicode MS", sans-serif;
  margin-bottom: 12px;
  letter-spacing: .3px;
}
.flashcard .pos {
  font-size: 13px;
  color: var(--accent);
  font-weight: 500;
  margin-bottom: 16px;
}
.flashcard .mn {
  font-size: 17px;
  line-height: 1.7;
  color: var(--text);
}
.flashcard .trick {
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px dashed var(--border);
  font-size: 14px;
  color: #b45309;
  font-style: italic;
}
.flashcard .trick:empty { display: none; }

.learn-meta {
  display: flex;
  justify-content: space-between;
  margin-bottom: 12px;
  font-size: 13px;
  color: var(--muted);
}

/* 模式切换 */
.mode-tabs {
  display: flex;
  gap: 6px;
  margin-bottom: 12px;
}
.mode-tabs button {
  flex: 1;
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: 8px;
  padding: 9px 0;
  font-size: 14px;
  cursor: pointer;
  font-family: inherit;
  color: var(--text);
  transition: background .15s, border-color .15s;
}
.mode-tabs button.active {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}
.mode-tabs button:hover:not(.active) { background: var(--accent-soft); border-color: var(--accent); }

/* 答题输入 */
.answer-input {
  display: flex;
  gap: 8px;
  justify-content: center;
  align-items: center;
  margin: 16px 0 8px;
  flex-wrap: wrap;
}
.answer-input input {
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 16px;
  font-family: inherit;
  outline: none;
  width: 220px;
  text-align: center;
}
.answer-input input:focus { border-color: var(--accent); }
.answer-input .speak.big {
  width: auto;
  height: auto;
  border-radius: 8px;
  padding: 10px 16px;
  font-size: 14px;
}
.check-result {
  font-size: 15px;
  font-weight: 600;
  min-height: 22px;
  margin-bottom: 8px;
}
.check-result.ok { color: var(--l5); }
.check-result.bad { color: #dc2626; }

.quiz-opts {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 16px 0 8px;
}
.quiz-opts .opt {
  text-align: left;
  padding: 12px 14px;
  line-height: 1.5;
}
.quiz-opts .opt:disabled { cursor: default; }
.quiz-opts .opt.ok { background: #dcfce7 !important; border-color: var(--l5) !important; color: #15803d !important; }
.quiz-opts .opt.bad { background: #fee2e2 !important; border-color: #dc2626 !important; color: #dc2626 !important; }
.quiz-opts .opt:hover:not(:disabled) { border-color: var(--accent); color: var(--accent); }

.learn-meta {
  display: flex;
  justify-content: space-between;
  margin-bottom: 12px;
  font-size: 13px;
  color: var(--muted);
}

.actions {
  display: flex;
  gap: 8px;
  margin-top: 24px;
  justify-content: center;
}
.actions button {
  flex: 1;
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: 8px;
  padding: 11px 12px;
  font-size: 14px;
  cursor: pointer;
  font-family: inherit;
  color: var(--text);
  min-width: 0;
  transition: background .15s, border-color .15s, color .15s;
}
.actions button:hover { border-color: var(--accent); color: var(--accent); }
.rbtn {
  flex: 1;
  min-width: 0;
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: 8px;
  padding: 11px 12px;
  font-size: 14px;
  cursor: pointer;
  font-family: inherit;
  color: var(--text);
  transition: background .15s, border-color .15s, color .15s;
}
.rbtn:hover { border-color: var(--accent); color: var(--accent); }
.rbtn.primary { background: var(--l5); color: #fff; border-color: var(--l5); }
.rbtn.primary:hover { background: #15803d; color: #fff; border-color: #15803d; }
.rbtn.warn { color: #dc2626; border-color: #fca5a5; background: #fef2f2; }
.rbtn.warn:hover { color: #dc2626; border-color: #dc2626; background: #fee2e2; }
.flashcard #rateWrap, .rateWrap {
  display: flex;
  gap: 8px;
  justify-content: center;
  margin-top: 18px;
}

/* 巧记面板 */
.trick-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 18px 20px;
  margin-top: 24px;
  box-shadow: var(--shadow);
}
.trick-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 10px;
}
.link-btn {
  background: none;
  border: none;
  color: var(--accent);
  cursor: pointer;
  font-size: 13px;
  font-family: inherit;
}
.trick-body .trick-item {
  display: flex;
  gap: 10px;
  padding: 8px 0;
  border-top: 1px dashed var(--border);
  font-size: 14px;
}
.trick-body .trick-item:first-child { border-top: none; }
.trick-body .tk {
  color: var(--muted);
  min-width: 84px;
  flex-shrink: 0;
}
.trick-body .tv { color: #b45309; }
.trick-empty { color: var(--muted); font-size: 13px; padding: 4px 0; }

/* 巧记编辑弹窗 */
dialog {
  border: none;
  border-radius: 16px;
  padding: 0;
  max-width: 520px;
  width: 92%;
  box-shadow: 0 10px 40px rgba(0,0,0,.18);
}
dialog::backdrop { background: rgba(0,0,0,.35); }
.trick-form { padding: 24px; }
.trick-form h3 { margin: 0 0 16px; font-size: 17px; }
.trick-form .tf {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 14px;
}
.trick-form .tf span { font-size: 13px; color: var(--muted); }
.trick-form .tf input {
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  font-family: inherit;
  outline: none;
}
.trick-form .tf input:focus { border-color: var(--accent); }
.dlg-actions { display: flex; gap: 10px; justify-content: flex-end; margin-top: 8px; }
.dlg-actions button {
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: 8px;
  padding: 9px 20px;
  font-size: 14px;
  cursor: pointer;
  font-family: inherit;
}
.dlg-actions .ghost { color: var(--muted); }
.dlg-actions .primary { background: var(--accent); color: white; border-color: var(--accent); }
.dlg-actions .primary:hover { background: #1d4ed8; }

@media (max-width: 640px) {
  .container, .learn-wrap { padding: 16px; }
  .hero h1 { font-size: 22px; }
  .flashcard { padding: 36px 20px; }
  .flashcard .w { font-size: 32px; }
  .word-list { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); }
}

/* ===== 登录 / 注册（云端同步） ===== */
#auth-mount {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.auth-user { font-size: 13px; color: var(--muted); }
.auth-btn {
  font-size: 13px;
  font-family: inherit;
  padding: 5px 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  transition: background .15s, border-color .15s, color .15s;
}
.auth-btn:hover { border-color: var(--accent); color: var(--accent); }
.auth-btn.primary { background: var(--accent); color: #fff; border-color: var(--accent); }
.auth-btn.primary:hover { background: #1d4ed8; color: #fff; border-color: #1d4ed8; }

.auth-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, .45);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
}
.auth-box {
  background: var(--surface);
  border-radius: 14px;
  padding: 22px 24px;
  width: 320px;
  max-width: 90vw;
  box-shadow: 0 10px 40px rgba(0, 0, 0, .25);
}
.auth-box h3 { margin: 0 0 14px; font-size: 17px; }
.auth-box input {
  width: 100%;
  box-sizing: border-box;
  padding: 9px 12px;
  margin: 6px 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  font-family: inherit;
  outline: none;
}
.auth-box input:focus { border-color: var(--accent); }
.auth-box .row { display: flex; gap: 8px; margin-top: 12px; }
.auth-box .row .auth-btn { flex: 1; }
.auth-msg { font-size: 12px; margin-top: 8px; min-height: 14px; }
.auth-msg.err { color: #dc2626; }
.auth-msg.ok { color: var(--l5); }
.auth-forgot { margin-top: 8px; font-size: 13px; text-align: right; }
.auth-forgot a { color: var(--accent); text-decoration: none; }
.auth-forgot a:hover { text-decoration: underline; }