:root {
  --bg: #f4f2ec;
  --panel: #fff;
  --ink: #1c2826;
  --muted: #61716d;
  --line: #d9ddd5;
  --accent: #0f6e56;
  --soft: #e1f0ea;
  --known: #2f8f4f;
  --learning: #c0492a;
  --note: #fffdf7;
  --shadow: 0 10px 28px rgba(28, 40, 38, 0.08);
}

[data-theme-dark] {
  --bg: #161d1a;
  --panel: #202925;
  --ink: #eef1eb;
  --muted: #a6b0aa;
  --line: #3c4741;
  --soft: #123a33;
  --note: #252e29;
  --shadow: 0 12px 28px rgba(0, 0, 0, 0.3);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { height: 100%; touch-action: manipulation; }
body {
  min-height: 100%;
  min-height: 100vh;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  user-select: none;
}
button, input, select, textarea { font: inherit; }
button, select { cursor: pointer; }
input, textarea, .selectable {
  -webkit-user-select: text;
  user-select: text;
}

header {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid var(--line);
  background: #f4f2ec;
  padding-top: 0;
  padding-top: var(--safe-area-inset-top, env(safe-area-inset-top, 0px));
}
[data-theme-dark] header { background: #161d1a; }
@supports ((-webkit-backdrop-filter: blur(12px)) or (backdrop-filter: blur(12px))) {
  header {
    background: rgba(244, 242, 236, 0.92);
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
  }
  [data-theme-dark] header { background: rgba(22, 29, 26, 0.92); }
}

.shell { max-width: 1180px; margin: auto; padding: 18px 24px; }
.top {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  margin-left: -16px;
  margin-top: -16px;
}
.top > * { margin-left: 16px; margin-top: 16px; }
.supports-flex-gap .top { margin-left: 0; margin-top: 0; column-gap: 16px; row-gap: 16px; }
.supports-flex-gap .top > * { margin-left: 0; margin-top: 0; }

.accent { width: 12px; height: 44px; border-radius: 99px; background: var(--accent); }
.brand { min-width: 260px; }
.eyebrow { color: var(--muted); font-size: 12px; letter-spacing: 0.08em; }
.brand h1 {
  font-family: "Songti SC", "STSong", serif;
  font-size: 24px;
  letter-spacing: -0.04em;
}
.brand p { margin-top: 2px; color: var(--muted); font-size: 13px; }
.spacer { flex: 1; }
.picker, select, input, textarea {
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--ink);
  border-radius: 10px;
}
.picker, select, input[type="search"] { min-height: 42px; padding: 0 12px; }
.picker { min-width: 210px; }
.badge {
  padding: 4px 9px;
  border-radius: 999px;
  background: var(--soft);
  color: var(--accent);
  font-size: 12px;
}
.toolbar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  margin-top: 16px;
  margin-left: -8px;
}
.toolbar > * { margin-left: 8px; margin-top: 8px; }
.supports-flex-gap .toolbar { margin-left: 0; column-gap: 8px; row-gap: 8px; }
.supports-flex-gap .toolbar > * { margin-left: 0; margin-top: 0; }
.toolbar input { flex: 1; min-width: 220px; }
.button {
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--ink);
  border-radius: 10px;
  min-height: 42px;
  padding: 0 14px;
  font-size: 13px;
  font-weight: 600;
}
.button:focus, .button:hover {
  border-color: var(--accent);
  outline: 2px solid rgba(15, 110, 86, 0.25);
  outline-offset: 1px;
}
.button:active { opacity: 0.7; }
.chips {
  display: flex;
  overflow: auto;
  padding: 12px 0 2px;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior-x: contain;
}
.chips > * + * { margin-left: 8px; }
.supports-flex-gap .chips { column-gap: 8px; }
.supports-flex-gap .chips > * + * { margin-left: 0; }
.chip {
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--muted);
  border-radius: 999px;
  padding: 7px 12px;
  white-space: nowrap;
  font-size: 13px;
}
.chip.active { border-color: var(--accent); background: var(--accent); color: #fff; }
.section { border-style: dashed; }

.stats {
  max-width: 1180px;
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  margin-left: auto;
  margin-right: auto;
}
.stats > * + * { margin-left: 12px; }
.supports-flex-gap .stats { column-gap: 12px; row-gap: 8px; }
.supports-flex-gap .stats > * + * { margin-left: 0; }
.pill {
  border-radius: 999px;
  padding: 4px 10px;
  font-size: 13px;
  background: var(--panel);
  border: 1px solid var(--line);
}
.progress {
  height: 8px;
  min-width: 180px;
  flex: 1;
  background: var(--line);
  border-radius: 99px;
  overflow: hidden;
}
.progress i { display: block; height: 100%; width: 0; background: var(--accent); transition: width 0.2s; }
.count { color: var(--muted); font-size: 13px; }

main { max-width: 1180px; margin: auto; padding: 6px 24px 40px; }
.deck {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  grid-gap: 16px;
  gap: 16px;
}
.card { min-width: 0; }
.face {
  min-height: 245px;
  display: flex;
  flex-direction: column;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 20px;
  box-shadow: var(--shadow);
}
.front { cursor: pointer; }
.back { display: none; }
.flipped .front { display: none; }
.flipped .back { display: flex; }
.meta { display: flex; align-items: center; flex-wrap: wrap; }
.meta > * + * { margin-left: 8px; }
.supports-flex-gap .meta { column-gap: 8px; row-gap: 8px; }
.supports-flex-gap .meta > * + * { margin-left: 0; }
.tag { color: #fff; border-radius: 999px; padding: 3px 9px; font-size: 11px; }
.num, .type { font-size: 11px; color: var(--muted); }
.type { margin-left: auto; }
.stars { display: flex; }
.stars > * + * { margin-left: 2px; }
.supports-flex-gap .stars { column-gap: 2px; }
.supports-flex-gap .stars > * + * { margin-left: 0; }
.star { border: 0; background: transparent; padding: 0; color: var(--line); font-size: 17px; }
.star.on { color: #d4921d; }
.term {
  font: 700 24px/1.3 "Songti SC", "STSong", serif;
  color: var(--accent);
  margin-top: 26px;
  overflow-wrap: break-word;
  word-wrap: break-word;
}
.definition { font-size: 16px; margin-top: 24px; overflow-wrap: break-word; word-wrap: break-word; }
.translation { margin-top: 10px; color: #236fae; font-size: 15px; overflow-wrap: break-word; word-wrap: break-word; }
.answer-translation { padding-top: 10px; border-top: 1px dashed var(--line); }
.example { margin-top: 14px; padding: 10px 12px; border-radius: 10px; background: var(--soft); font-size: 13px; }
.hint { margin-top: auto; padding-top: 20px; color: var(--muted); font-size: 12px; }
.card-image { display: block; max-width: 100%; max-height: 180px; object-fit: contain; margin: 16px auto 0; border-radius: 10px; }
.actions { display: flex; margin-top: auto; padding-top: 22px; }
.actions > * + * { margin-left: 8px; }
.supports-flex-gap .actions { column-gap: 8px; }
.supports-flex-gap .actions > * + * { margin-left: 0; }
.sbtn {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 7px 12px;
  background: var(--bg);
  color: var(--muted);
  font-size: 12px;
}
.sbtn.on.known { background: var(--known); border-color: var(--known); color: #fff; }
.sbtn.on.learning { background: var(--learning); border-color: var(--learning); color: #fff; }
.note-wrap { position: relative; margin-top: 18px; }
.note-wrap span {
  display: inline-block;
  padding: 1px 8px;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  font-size: 11px;
  -webkit-transform: translate(10px, 8px);
  transform: translate(10px, 8px);
}
.note {
  display: block;
  width: 100%;
  min-height: 58px;
  resize: vertical;
  padding: 16px 12px 10px;
  border: 1px dashed var(--accent);
  border-radius: 10px;
  background: var(--note);
  color: var(--ink);
  outline: none;
}
.note:focus { box-shadow: 0 0 0 3px rgba(15, 110, 86, 0.2); }
.empty, .error, .loading {
  text-align: center;
  border: 1px dashed var(--line);
  border-radius: 16px;
  padding: 48px 20px;
  color: var(--muted);
  background: var(--panel);
}
.error h2 { color: var(--ink); }
.load-wrap { text-align: center; padding-top: 22px; }
footer {
  border-top: 1px solid var(--line);
  padding: 24px;
  padding-bottom: 24px;
  padding-bottom: calc(24px + var(--safe-area-inset-bottom, env(safe-area-inset-bottom, 0px)));
  color: var(--muted);
  text-align: center;
  font-size: 12px;
}

.manager-backdrop {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  background: rgba(15, 24, 20, 0.5);
}
.manager-backdrop[hidden] { display: none !important; }
.manager {
  width: 100%;
  max-width: 760px;
  max-height: 720px;
  overflow: auto;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior-y: contain;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--panel);
  box-shadow: var(--shadow);
  padding: 24px;
}
@media (max-height: 780px) {
  .manager { max-height: 92vh; }
}
.manager-head { display: flex; align-items: flex-start; }
.manager-head > * + * { margin-left: 16px; }
.supports-flex-gap .manager-head { column-gap: 16px; }
.supports-flex-gap .manager-head > * + * { margin-left: 0; }
.manager-head h2 { font: 700 22px/1.25 "Songti SC", "STSong", serif; }
.manager-head p { margin-top: 4px; color: var(--muted); font-size: 13px; }
.manager-close {
  margin-left: auto;
  border: 0;
  background: transparent;
  color: var(--muted);
  font-size: 26px;
  line-height: 1;
}
.manager-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-gap: 16px;
  gap: 16px;
  margin-top: 22px;
}
.manager-panel {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px;
  background: var(--bg);
}
.manager-panel h3 { margin: 0 0 7px; font-size: 14px; }
.manager-panel p { margin: 0 0 12px; color: var(--muted); font-size: 12px; }
.export-list { display: grid; grid-gap: 8px; gap: 8px; }
.export-list .button { text-align: left; }
.library { margin-top: 16px; border-top: 1px solid var(--line); padding-top: 16px; }
.library h3 { margin: 0 0 8px; font-size: 14px; }
.library-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 0;
  border-top: 1px dashed var(--line);
}
.library-row:first-of-type { border-top: 0; }
.library-row strong { display: block; font-size: 13px; }
.library-row small { display: block; color: var(--muted); font-size: 12px; }
.library-actions { display: flex; }
.library-actions > * + * { margin-left: 6px; }
.supports-flex-gap .library-actions { column-gap: 6px; }
.supports-flex-gap .library-actions > * + * { margin-left: 0; }
.text-btn {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 5px 9px;
  background: var(--panel);
  color: var(--ink);
  font-size: 12px;
}
.text-btn:disabled { opacity: 0.55; cursor: default; }
.text-btn.danger { color: #a32d2d; }
.toast {
  position: fixed;
  z-index: 40;
  right: 18px;
  bottom: 18px;
  bottom: calc(18px + var(--safe-area-inset-bottom, env(safe-area-inset-bottom, 0px)));
  max-width: 380px;
  padding: 11px 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel);
  box-shadow: var(--shadow);
  font-size: 13px;
}
@media (max-width: 416px) {
  .toast { max-width: calc(100vw - 36px); }
}
.toast.success { border-color: var(--known); }
.toast.warning { border-color: #ba7517; }
.toast.error { border-color: #a32d2d; }
.muted { color: var(--muted); font-size: 13px; }
.paste-box { min-height: 96px; margin-bottom: 10px; }
.export-text { min-height: 220px; }
.settings-toggle { display: none; }
.settings-panel { display: block; }
.deck-selection { display: flex; align-items: center; }
.deck-selection > * + * { margin-left: 8px; }
.supports-flex-gap .deck-selection { column-gap: 8px; }
.supports-flex-gap .deck-selection > * + * { margin-left: 0; }

@media (max-width: 760px) {
  .shell, main, .stats { padding-left: 16px; padding-right: 16px; }
  .shell { padding-top: 12px; padding-bottom: 10px; }
  .top { flex-wrap: nowrap; }
  .accent { width: 6px; height: 38px; }
  .brand { min-width: 0; flex: 1; }
  .eyebrow, .brand p { display: none; }
  .brand h1 { font-size: 18px; line-height: 1.25; }
  .spacer { display: none; }
  .settings-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 36px;
    padding: 0 12px;
    white-space: nowrap;
    border-color: var(--accent);
    color: var(--accent);
  }
  .settings-panel { display: none; margin-top: 12px; padding-top: 12px; border-top: 1px solid var(--line); }
  body.settings-open .settings-panel { display: block; }
  .deck-selection { width: 100%; }
  .picker { width: 100%; min-width: 0; }
  .badge { flex: none; }
  .toolbar { margin-top: 12px; }
  .toolbar input { min-width: 0; width: 100%; flex: 1 1 100%; }
  .toolbar .button { flex: 1; padding: 0 10px; }
  .chips { padding-top: 10px; }
  .deck { grid-template-columns: 1fr; }
  .face { min-height: 220px; }
  .term { margin-top: 18px; }
  .manager { padding: 18px; }
  .manager-grid { grid-template-columns: 1fr; }
  .stats { padding-top: 10px; padding-bottom: 10px; }
  .pill { font-size: 12px; padding: 3px 8px; }
  .progress { min-width: 90px; }
  .count { width: 100%; font-size: 12px; }
}