:root {
  --bg: #070b16;
  --card: rgba(16, 22, 42, 0.88);
  --line: rgba(125, 211, 252, 0.2);
  --text: #e8eefc;
  --muted: #93a0c2;
  --cyan: #3ddcff;
  --gold: #ffb020;
  --ok: #3dff9a;
  --bad: #ff5c7a;
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body {
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: radial-gradient(circle at top, #13203a, var(--bg) 55%);
  color: var(--text);
}

#app {
  max-width: 430px;
  margin: 0 auto;
  min-height: 100dvh;
  padding: calc(18px + env(safe-area-inset-top)) 18px calc(20px + env(safe-area-inset-bottom));
}

.screen { display: none !important; }
.screen.active { display: block !important; }
.screen:not(.active) { pointer-events: none !important; }

.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 18px;
}
.top.sticky {
  position: sticky;
  top: env(safe-area-inset-top);
  z-index: 8;
  margin-left: -18px;
  margin-right: -18px;
  padding: 10px 18px 12px;
  background: #10182c;
}
.text-btn {
  border: 0;
  background: none;
  color: var(--cyan);
  font: inherit;
  cursor: pointer;
  padding: 10px 8px;
  min-width: 72px;
  min-height: 44px;
  text-align: left;
  position: relative;
  z-index: 9;
}
.eyebrow { margin: 0; color: var(--cyan); letter-spacing: 0.14em; font-size: 12px; }
h1 { margin: 4px 0 0; font-size: 32px; }
.small-title { margin: 0; font-size: 20px; }

.icon-btn, .primary, .ghost, .ok, .bad {
  font: inherit;
  color: inherit;
  cursor: pointer;
}
.icon-btn {
  width: 42px; height: 42px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,0.04);
}
.primary, .ok, .bad, .ghost {
  width: 100%;
  border-radius: 16px;
  padding: 14px 16px;
  border: 1px solid transparent;
  font-weight: 800;
}
.primary { background: linear-gradient(180deg, #4ae6ff, #1aa8c8); color: #06212a; }
.ok { background: rgba(61, 255, 154, 0.16); border-color: rgba(61, 255, 154, 0.35); color: var(--ok); }
.bad { background: rgba(255, 92, 122, 0.14); border-color: rgba(255, 92, 122, 0.35); color: var(--bad); }
.ghost { background: transparent; border-color: var(--line); }
.primary, .ok, .bad, .ghost, .chip, .text-btn, .icon-btn {
  touch-action: manipulation;
  -webkit-tap-highlight-color: rgba(61, 220, 255, 0.2);
}
button:disabled {
  opacity: 0.4;
  pointer-events: none;
}

.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin-bottom: 14px;
}
.stats div, .progress-card, .panel, .card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 18px;
}
.stats div { padding: 12px 8px; text-align: center; }
.stats b { display: block; font-size: 22px; }
.stats span, .muted { color: var(--muted); font-size: 12px; }
.gold { color: var(--gold); }

.progress-card { padding: 16px; margin-bottom: 16px; }
.progress-card p { margin: 0 0 8px; }
.bar {
  height: 8px;
  border-radius: 99px;
  background: rgba(255,255,255,0.08);
  overflow: hidden;
  margin-bottom: 8px;
}
.bar i { display: block; height: 100%; width: 0; background: linear-gradient(90deg, var(--cyan), var(--gold)); }

.today-hint, .foot { color: var(--muted); font-size: 13px; line-height: 1.55; }
.row-btns { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin: 12px 0; }

.mode-tag { color: var(--gold); letter-spacing: 0.12em; text-align: center; }
.card {
  min-height: 220px;
  padding: 28px 18px;
  text-align: center;
  margin-bottom: 16px;
  cursor: pointer;
  -webkit-tap-highlight-color: rgba(61, 220, 255, 0.18);
}
.card-en { margin: 0; font-size: 40px; letter-spacing: 0.04em; }
.card-ipa {
  margin: 6px 0 0;
  color: var(--cyan);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 20px;
  letter-spacing: 0.02em;
}
.card-ipa[hidden] { display: none !important; }
.card-pos { color: var(--muted); }
.card-cn { font-size: 26px; color: var(--gold); }
.card-ex { color: var(--muted); }
.card-phrase {
  margin: 10px 0 0;
  color: var(--cyan);
  font-size: 16px;
  line-height: 1.45;
}
.card-phrase[hidden] { display: none !important; }
.card-forms {
  margin: 8px 0 0;
  color: var(--gold);
  font-size: 15px;
}
.card-forms[hidden] { display: none !important; }

.choices { display: grid; gap: 8px; margin-bottom: 12px; }
.choice {
  width: 100%;
  text-align: left;
  padding: 14px;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--text);
  cursor: pointer;
  font: inherit;
}
.choice.right { border-color: var(--ok); color: var(--ok); }
.choice.wrong { border-color: var(--bad); color: var(--bad); }

.spell {
  width: 100%;
  margin-bottom: 12px;
  padding: 14px;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: #0d1426;
  color: var(--text);
  font-size: 20px;
}

.study-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}
#btn-show,
#btn-check,
#btn-master {
  grid-column: 1 / -1;
}
.master-btn {
  font-size: 14px;
  padding: 10px 16px;
  color: var(--muted);
}
.study-actions button[hidden],
.choices[hidden],
.spell[hidden] { display: none !important; }
#study-progress { color: var(--muted); }

.dialog {
  position: fixed;
  inset: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: rgba(4, 8, 18, 0.72);
}
.dialog[hidden] { display: none !important; }
.dialog-card {
  width: min(100%, 360px);
  padding: 20px 18px;
  border-radius: 18px;
  background: #121a30;
  border: 1px solid var(--line);
}
.dialog-title {
  margin: 0 0 8px;
  font-size: 20px;
  font-weight: 800;
}
.dialog-word {
  margin: 0 0 8px;
  font-size: 28px;
  letter-spacing: 0.04em;
}
.dialog-card .muted { margin: 0 0 16px; }
.dialog-card button { margin-top: 8px; }

.result-stats {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}
.result-stats li { background: rgba(255,255,255,0.04); border-radius: 12px; padding: 10px; }
.result-stats span { display: block; color: var(--muted); font-size: 12px; }
.result-stats b { font-size: 22px; }

.settings-panel { padding: 16px; display: grid; gap: 16px; }
.settings-panel label { display: grid; gap: 8px; }
.settings-panel select {
  padding: 10px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: #0d1426;
  color: var(--text);
}
.check { display: flex !important; align-items: center; gap: 8px; grid-template-columns: none; }

.chips { display: flex; gap: 8px; margin-bottom: 12px; overflow-x: auto; }
.chip {
  border-radius: 999px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--text);
  padding: 6px 12px;
  font: inherit;
  white-space: nowrap;
}
.chip.on { border-color: var(--cyan); color: var(--cyan); }

.search {
  width: 100%;
  margin-bottom: 12px;
  padding: 12px 14px;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: #0d1426;
  color: var(--text);
  font: inherit;
  font-size: 16px;
}
.search::placeholder { color: var(--muted); }

.pager-info { margin: 0 0 8px; color: var(--muted); font-size: 12px; }
.pager { margin-top: 12px; }

.word-list { display: grid; gap: 8px; }
.word-row {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  padding: 12px;
  border-radius: 14px;
  background: var(--card);
  border: 1px solid var(--line);
}
.word-row small { color: var(--muted); }
.word-row .ipa {
  color: var(--cyan);
  font-family: Georgia, "Times New Roman", serif;
  font-weight: 400;
  margin-left: 6px;
}
.word-row .tag { color: var(--gold); font-size: 12px; }
.word-row .phrase { color: var(--cyan); }