@font-face {
  font-family: "Pinyin Regular";
  src:
    url("./fonts/pinyin-regular.woff2") format("woff2"),
    url("./fonts/pinyin-regular.ttf") format("truetype");
  font-display: swap;
}

@font-face {
  font-family: "Pinyin Step";
  src:
    url("./fonts/pinyin-step.woff2") format("woff2"),
    url("./fonts/pinyin-step.ttf") format("truetype");
  font-display: swap;
}

@font-face {
  font-family: "Pinyin WenKai";
  src:
    url("./fonts/pinyin-wenkai-light.woff2") format("woff2"),
    url("./fonts/pinyin-wenkai-light.ttf") format("truetype");
  font-display: swap;
}

@font-face {
  font-family: "Andika Basic";
  src: url("./fonts/andika-basic.ttf") format("truetype");
  font-display: swap;
}

:root {
  --bg: #f5efe3;
  --panel: rgba(255, 251, 244, 0.84);
  --panel-strong: rgba(255, 250, 241, 0.95);
  --ink: #1d2b36;
  --muted: #6d6b63;
  --accent: #ff6b6b;
  --accent-deep: #ee5a52;
  --accent-soft: #ffd93d;
  --line: rgba(29, 43, 54, 0.12);
  --shadow: 0 24px 60px rgba(102, 66, 28, 0.16);
  --body-font: "Avenir Next", "PingFang SC", "Hiragino Sans GB", sans-serif;
  --card-font: "Kaiti SC", "STKaiti", "KaiTi", serif;
  --guide-line-1: 11%;
  --guide-line-2: 36%;
  --guide-line-3: 61%;
  --guide-line-4: 86%;
  --guide-line-thickness: 0.75%;
  
  /* 儿童友好的动画变量 */
  --bounce-timing: cubic-bezier(0.68, -0.55, 0.265, 1.55);
  --smooth-timing: cubic-bezier(0.4, 0, 0.2, 1);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: var(--body-font);
  background:
    radial-gradient(circle at top left, rgba(255, 182, 193, 0.5), transparent 28%),
    radial-gradient(circle at bottom right, rgba(173, 216, 230, 0.5), transparent 32%),
    radial-gradient(circle at center, rgba(255, 253, 208, 0.3), transparent 50%),
    linear-gradient(160deg, #fff5f7 0%, #e8f4f8 48%, #fffef0 100%);
  color: var(--ink);
  overflow-x: hidden;
  animation: backgroundShift 20s ease-in-out infinite alternate;
}

@keyframes backgroundShift {
  0% { background-position: 0% 0%; }
  100% { background-position: 100% 100%; }
}

button {
  font: inherit;
}

.page-shell {
  position: relative;
  overflow: hidden;
  min-height: 100vh;
}

.aurora {
  position: absolute;
  border-radius: 999px;
  filter: blur(28px);
  opacity: 0.6;
  pointer-events: none;
}

.aurora-one {
  top: 6%;
  left: -4%;
  width: 320px;
  height: 320px;
  background: radial-gradient(circle, rgba(255, 107, 107, 0.4), rgba(255, 182, 193, 0.2));
  animation: auroraFloat1 15s ease-in-out infinite;
}

@keyframes auroraFloat1 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(30px, 20px) scale(1.1); }
  66% { transform: translate(-20px, 30px) scale(0.95); }
}

.aurora-two {
  right: -4%;
  bottom: 8%;
  width: 360px;
  height: 360px;
  background: radial-gradient(circle, rgba(173, 216, 230, 0.4), rgba(135, 206, 250, 0.2));
  animation: auroraFloat2 18s ease-in-out infinite;
}

@keyframes auroraFloat2 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(-25px, -30px) scale(1.05); }
  66% { transform: translate(20px, -20px) scale(0.9); }
}

.app {
  position: relative;
  z-index: 1;
  width: min(1880px, calc(100% - 32px));
  margin: 0 auto;
  padding: 40px 0 56px;
}

.hero {
  display: grid;
  gap: 12px;
  margin-bottom: 24px;
  padding: 4px 2px 0;
}

.eyebrow {
  margin: 0 0 10px;
  font-size: 0.88rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent-deep);
  font-weight: 700;
  animation: eyebrowShine 3s ease-in-out infinite;
}

@keyframes eyebrowShine {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.8; }
}

.hero h1 {
  margin: 0;
  font-family: "Georgia", "Songti SC", serif;
  font-size: clamp(2.3rem, 6vw, 4.6rem);
  line-height: 0.95;
}

.hero-copy {
  width: 100%;
  margin: 0;
  font-size: 1.04rem;
  line-height: 1.7;
  color: var(--muted);
}

.panel,
.stage,
.tips,
.list-panel {
  background: var(--panel);
  border: 1px solid rgba(255, 255, 255, 0.55);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.panel {
  display: grid;
  gap: 18px;
  padding: 22px;
  border-radius: 26px;
}

.control-group {
  display: grid;
  gap: 10px;
}

.control-label {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--muted);
}

.segmented {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.segment {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-height: 44px;
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.62);
  color: var(--ink);
  font-size: 0.92rem;
  font-weight: 600;
  cursor: pointer;
  transition:
    transform 180ms ease,
    background 180ms ease,
    border-color 180ms ease,
    color 180ms ease,
    box-shadow 180ms ease;
}

.segment:hover,
.segment:focus-visible {
  transform: translateY(-2px) scale(1.05);
  border-color: rgba(255, 107, 107, 0.6);
  box-shadow: 0 6px 16px rgba(255, 107, 107, 0.2);
}

.segment:active {
  transform: translateY(0) scale(0.98);
}

.segment.is-active {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-deep) 100%);
  border-color: transparent;
  color: #fffdf8;
  box-shadow: 0 10px 18px rgba(255, 107, 107, 0.26);
  animation: none;
}

@keyframes pulseGlow {
  0%, 100% { box-shadow: 0 12px 22px rgba(255, 107, 107, 0.4); }
  50% { box-shadow: 0 12px 28px rgba(255, 107, 107, 0.6), 0 0 20px rgba(255, 107, 107, 0.3); }
}

.segment.is-playing {
  border-color: rgba(255, 107, 107, 0.55);
  background: rgba(255, 255, 255, 0.92);
  color: var(--ink);
  box-shadow: 0 8px 18px rgba(255, 107, 107, 0.18);
  animation: none;
}

.segment:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

#deck-type-group {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

#font-group {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

#action-group {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

#action-group .segment {
  min-height: 48px;
}

.audio-trigger {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  justify-content: center;
}

.audio-trigger > span:last-child {
  flex: 1 1 auto;
  text-align: center;
}

.audio-button-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  flex: 0 0 auto;
  border-radius: 999px;
  background: rgba(255, 107, 107, 0.12);
  color: var(--accent-deep);
  transition:
    background 180ms ease,
    color 180ms ease,
    transform 180ms ease,
    box-shadow 180ms ease;
}

.audio-button-icon svg {
  width: 100%;
  height: 100%;
}

.audio-trigger.is-playing .audio-button-icon {
  background: linear-gradient(135deg, var(--accent) 0%, #ff8b66 100%);
  color: #fff8ed;
  box-shadow: 0 8px 18px rgba(255, 107, 107, 0.28);
  animation: audioPulse 1.1s ease-in-out infinite;
}

@keyframes audioPulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.08); }
}

.audio-status {
  min-height: 1.25rem;
  margin: 2px 0 0;
  font-size: 0.9rem;
  line-height: 1.45;
  color: var(--muted);
}

.audio-status[data-tone="error"] {
  color: #b3481d;
}

.stage {
  padding: 32px;
  border-radius: 32px;
  min-width: 0;
}

.workspace-layout {
  display: grid;
  grid-template-columns: minmax(280px, 0.78fr) minmax(820px, 1.9fr) minmax(260px, 0.72fr);
  gap: 24px;
  align-items: start;
}

.sidebar-column,
.center-column {
  display: grid;
  gap: 20px;
  min-width: 0;
}

.sidebar-column {
  align-self: start;
}

.list-header {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 20px;
  margin-bottom: 18px;
}

.meta-label,
.meta-description,
.counter {
  margin: 0;
}

.deck-meta {
  display: grid;
  gap: 6px;
  margin-top: 12px;
  padding: 14px 16px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.62);
  border: 1px solid rgba(29, 43, 54, 0.08);
}

.meta-label {
  font-size: 1.02rem;
  font-weight: 700;
}

.meta-description,
.counter {
  color: var(--muted);
}

.card-frame {
  display: grid;
  gap: 14px;
  min-width: 0;
}

.flashcard,
.nav-button {
  border: none;
  cursor: pointer;
}

.nav-button {
  justify-self: center;
  min-width: 140px;
  padding: 10px 16px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.82);
  color: var(--accent-deep);
  box-shadow: 0 10px 20px rgba(121, 88, 40, 0.08);
  transition: transform 160ms ease, box-shadow 160ms ease;
}

.nav-button:hover,
.nav-button:focus-visible {
  transform: translateY(-2px) scale(1.05);
  box-shadow: 0 14px 24px rgba(255, 107, 107, 0.3);
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.95), rgba(255, 240, 245, 0.95));
}

.nav-button:active {
  transform: translateY(0) scale(0.98);
  transition: transform 0.1s ease;
}

.flashcard {
  position: relative;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto auto;
  justify-items: center;
  align-items: center;
  row-gap: 10px;
  min-height: 980px;
  padding: 32px;
  border-radius: 32px;
  background:
    linear-gradient(145deg, rgba(255, 253, 248, 0.94), rgba(250, 241, 225, 0.92)),
    linear-gradient(120deg, rgba(255, 255, 255, 0.85), rgba(255, 255, 255, 0.5));
  box-shadow:
    inset 0 0 0 1px rgba(255, 255, 255, 0.7),
    0 24px 44px rgba(130, 87, 30, 0.14);
  overflow: hidden;
  isolation: isolate;
  transition: transform 180ms ease, box-shadow 180ms ease;
}

.flashcard::before {
  content: "";
  position: absolute;
  inset: 24px;
  border: 1px dashed rgba(215, 99, 47, 0.2);
  border-radius: 24px;
  z-index: -1;
}

.flashcard:hover,
.flashcard:focus-visible {
  transform: translateY(-2px) scale(1.01);
  box-shadow:
    inset 0 0 0 1px rgba(255, 255, 255, 0.8),
    0 28px 54px rgba(255, 107, 107, 0.25),
    0 0 40px rgba(255, 217, 61, 0.2);
  animation: cardWiggle 0.5s ease-in-out;
}

@keyframes cardWiggle {
  0%, 100% { transform: translateY(-2px) scale(1.01) rotate(0deg); }
  25% { transform: translateY(-2px) scale(1.01) rotate(0.5deg); }
  75% { transform: translateY(-2px) scale(1.01) rotate(-0.5deg); }
}

.card-category {
  align-self: start;
  justify-self: start;
  padding: 10px 18px;
  border-radius: 999px;
  background: linear-gradient(135deg, rgba(255, 107, 107, 0.2), rgba(255, 217, 61, 0.2));
  color: var(--accent-deep);
  font-size: 1rem;
  font-weight: 700;
  border: 2px solid rgba(255, 107, 107, 0.3);
  animation: categoryFloat 3s ease-in-out infinite;
}

@keyframes categoryFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-4px); }
}

.card-value {
  font-family: var(--card-font);
  letter-spacing: 0.04em;
}

.card-values {
  position: relative;
  display: grid;
  place-items: center;
  min-width: min(48vw, 340px);
  min-height: min(44vw, 320px);
  padding: clamp(18px, 3vw, 26px) clamp(24px, 4vw, 32px) clamp(20px, 4vw, 28px);
  border-radius: 28px;
  background:
    linear-gradient(
      to bottom,
      transparent 0%,
      transparent calc(var(--guide-line-1) - var(--guide-line-thickness)),
      rgba(41, 67, 82, 0.18) calc(var(--guide-line-1) - var(--guide-line-thickness)),
      rgba(41, 67, 82, 0.18) calc(var(--guide-line-1) + var(--guide-line-thickness)),
      transparent calc(var(--guide-line-1) + var(--guide-line-thickness)),
      transparent calc(var(--guide-line-2) - var(--guide-line-thickness)),
      rgba(41, 67, 82, 0.16) calc(var(--guide-line-2) - var(--guide-line-thickness)),
      rgba(41, 67, 82, 0.16) calc(var(--guide-line-2) + var(--guide-line-thickness)),
      transparent calc(var(--guide-line-2) + var(--guide-line-thickness)),
      transparent calc(var(--guide-line-3) - var(--guide-line-thickness)),
      rgba(215, 99, 47, 0.22) calc(var(--guide-line-3) - var(--guide-line-thickness)),
      rgba(215, 99, 47, 0.22) calc(var(--guide-line-3) + var(--guide-line-thickness)),
      transparent calc(var(--guide-line-3) + var(--guide-line-thickness)),
      transparent calc(var(--guide-line-4) - var(--guide-line-thickness)),
      rgba(41, 67, 82, 0.18) calc(var(--guide-line-4) - var(--guide-line-thickness)),
      rgba(41, 67, 82, 0.18) calc(var(--guide-line-4) + var(--guide-line-thickness)),
      transparent calc(var(--guide-line-4) + var(--guide-line-thickness))
    ),
    rgba(255, 255, 255, 0.52);
  box-shadow:
    inset 0 0 0 1px rgba(255, 255, 255, 0.6),
    0 12px 28px rgba(121, 88, 40, 0.08);
}

.card-detail {
  font-size: 1rem;
  letter-spacing: 0.12em;
  color: var(--accent-deep);
  text-align: center;
}

.reference-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
  margin-top: 20px;
}

.reference-grid[hidden] {
  display: none;
}

.reference-card {
  padding: 22px;
  border-radius: 28px;
  background: var(--panel);
  border: 1px solid rgba(255, 255, 255, 0.55);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.reference-eyebrow {
  margin: 0 0 10px;
  font-size: 0.8rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent-deep);
}

.reference-card h2 {
  margin: 0;
  font-size: 1.18rem;
}

.reference-copy {
  margin: 14px 0 0;
  line-height: 1.75;
  color: var(--muted);
}

.reference-quote {
  margin: 16px 0 0;
  padding: 14px 16px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.68);
  color: var(--ink);
  line-height: 1.75;
}

.reference-list {
  margin: 16px 0 0;
  padding-left: 20px;
  color: var(--ink);
}

.reference-list li + li {
  margin-top: 10px;
}

.pair-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 16px;
}

.pair-chip {
  padding: 10px 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(29, 43, 54, 0.1);
  font-family: var(--card-font);
  font-size: 1.1rem;
  color: var(--ink);
}

.card-value,
.card-subvalue {
  position: absolute;
  left: var(--glyph-left, 50%);
  top: 0;
  width: var(--glyph-width, 70%);
  height: var(--glyph-height, 50%);
  margin: 0;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  font-family: var(--card-font);
  font-size: var(--glyph-size-px, 7rem);
  line-height: 1;
  letter-spacing: var(--glyph-spacing, 0.04em);
  text-transform: none;
  color: var(--ink);
  text-align: center;
  transform: translateX(-50%) translateY(var(--glyph-shift-y, 0%));
}

.card-values {
  --layout-scale: 1;
}

.flashcard[data-deck="pinyin"] .card-values {
  min-width: min(64vw, 720px);
  min-height: min(74vh, 820px);
}

.flashcard[data-deck="pinyin"][data-long="true"] .card-values {
  min-width: min(78vw, 920px);
}

.flashcard[data-deck="english"] .card-values {
  min-width: min(68vw, 780px);
  min-height: min(76vh, 860px);
  padding: 24px 32px;
}

.flashcard[data-deck="phonetic"] .card-values {
  min-width: min(72vw, 820px);
  min-height: min(76vh, 860px);
  padding: 24px 32px;
}

.flashcard[data-deck="phonetic"][data-long="true"] .card-values {
  min-width: min(82vw, 980px);
}

.flashcard[data-deck="english"][data-mode="combined"] .card-values {
  min-width: min(90vw, 1180px);
  min-height: min(62vh, 700px);
  padding: 24px 48px;
  background:
    linear-gradient(
      to bottom,
      transparent 0%,
      transparent calc(var(--guide-line-1) - var(--guide-line-thickness)),
      rgba(41, 67, 82, 0.18) calc(var(--guide-line-1) - var(--guide-line-thickness)),
      rgba(41, 67, 82, 0.18) calc(var(--guide-line-1) + var(--guide-line-thickness)),
      transparent calc(var(--guide-line-1) + var(--guide-line-thickness)),
      transparent calc(var(--guide-line-2) - var(--guide-line-thickness)),
      rgba(41, 67, 82, 0.16) calc(var(--guide-line-2) - var(--guide-line-thickness)),
      rgba(41, 67, 82, 0.16) calc(var(--guide-line-2) + var(--guide-line-thickness)),
      transparent calc(var(--guide-line-2) + var(--guide-line-thickness)),
      transparent calc(var(--guide-line-3) - var(--guide-line-thickness)),
      rgba(215, 99, 47, 0.22) calc(var(--guide-line-3) - var(--guide-line-thickness)),
      rgba(215, 99, 47, 0.22) calc(var(--guide-line-3) + var(--guide-line-thickness)),
      transparent calc(var(--guide-line-3) + var(--guide-line-thickness)),
      transparent calc(var(--guide-line-4) - var(--guide-line-thickness)),
      rgba(41, 67, 82, 0.18) calc(var(--guide-line-4) - var(--guide-line-thickness)),
      rgba(41, 67, 82, 0.18) calc(var(--guide-line-4) + var(--guide-line-thickness)),
      transparent calc(var(--guide-line-4) + var(--guide-line-thickness))
    ),
    rgba(255, 255, 255, 0.52);
}

.flashcard[data-deck="english"][data-mode="combined"] {
  min-height: 860px;
}

.card-hint {
  align-self: end;
  font-size: 0.95rem;
  color: var(--muted);
}

.tips {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  padding: 16px;
  border-radius: 24px;
}

.tip-card {
  display: grid;
  align-content: start;
  justify-items: center;
  gap: 8px;
  padding: 14px 12px;
  min-height: 88px;
  border-radius: 20px;
  background: var(--panel-strong);
  min-width: 0;
  border: 1px solid rgba(29, 43, 54, 0.06);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.45);
}

.tip-card p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.35;
  color: var(--muted);
  text-align: center;
}

.tip-kbd {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-height: 34px;
  padding: 9px 12px;
  border-radius: 14px;
  background: linear-gradient(135deg, #ff6b6b, #ee5a52);
  color: #fff8ed;
  text-align: center;
  white-space: nowrap;
  font-weight: 700;
  font-size: 0.85rem;
  line-height: 1;
  box-shadow: 0 4px 12px rgba(255, 107, 107, 0.3);
  animation: keyFloat 2s ease-in-out infinite;
}

@keyframes keyFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-3px); }
}

.list-panel {
  padding: 22px;
  border-radius: 28px;
  position: sticky;
  top: 20px;
  max-height: calc(100vh - 40px);
  overflow: auto;
}

.card-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.list-chip {
  border: 1px solid rgba(29, 43, 54, 0.1);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.72);
  padding: 12px 16px;
  min-width: 70px;
  font-family: var(--card-font);
  font-size: 1.3rem;
  color: var(--ink);
  cursor: pointer;
  transition:
    transform 160ms ease,
    border-color 160ms ease,
    box-shadow 160ms ease,
    background 160ms ease,
    color 160ms ease;
}

.list-chip:hover,
.list-chip:focus-visible {
  transform: translateY(-2px) scale(1.08);
  border-color: rgba(255, 107, 107, 0.6);
  box-shadow: 0 8px 16px rgba(255, 107, 107, 0.2);
}

.list-chip:active {
  transform: translateY(0) scale(1);
}

.list-chip.is-active {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-deep) 100%);
  border-color: transparent;
  color: #fffdf8;
  box-shadow: 0 14px 26px rgba(255, 107, 107, 0.4);
  animation: chipBounce 0.6s var(--bounce-timing);
}

@keyframes chipBounce {
  0% { transform: scale(1); }
  50% { transform: scale(1.15); }
  100% { transform: scale(1); }
}

.flashcard:fullscreen {
  width: 100vw;
  height: 100vh;
  max-width: none;
  min-height: 100vh;
  padding: 40px;
  border-radius: 0;
  background:
    linear-gradient(145deg, rgba(255, 253, 248, 0.98), rgba(250, 241, 225, 0.98)),
    linear-gradient(120deg, rgba(255, 255, 255, 0.92), rgba(255, 255, 255, 0.72));
}

.flashcard:fullscreen::before {
  inset: 28px;
  border-radius: 32px;
}

.flashcard:fullscreen .card-category {
  font-size: 1.05rem;
}

.flashcard:fullscreen .card-hint {
  font-size: 1rem;
}

.flashcard:fullscreen .card-values {
  --layout-scale: 1.34;
  min-width: min(88vw, 1400px);
  min-height: min(82vh, 980px);
}

.flashcard:fullscreen[data-deck="english"] .card-values {
  min-width: min(90vw, 1500px);
  min-height: min(84vh, 1000px);
}

.flashcard:fullscreen[data-deck="english"][data-mode="combined"] .card-values {
  min-width: min(96vw, 1700px);
  min-height: min(72vh, 760px);
}

@media (max-width: 1480px) {
  .workspace-layout {
    grid-template-columns: minmax(280px, 0.9fr) minmax(0, 1.4fr);
  }

  .list-panel {
    grid-column: 1 / -1;
    position: static;
    max-height: none;
    overflow: visible;
  }

  .stage {
    overflow: auto;
  }
}

@media (max-width: 900px) {
  .workspace-layout {
    grid-template-columns: 1fr;
  }

  #font-group,
  #action-group {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .tips {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .reference-grid {
    grid-template-columns: 1fr;
  }

  .list-panel {
    position: static;
    max-height: none;
    overflow: visible;
  }
}

@media (max-width: 720px) {
  .app {
    width: min(100% - 20px, 680px);
    padding-top: 22px;
    padding-bottom: 28px;
  }

  .panel,
  .stage,
  .tips,
  .list-panel,
  .reference-card {
    border-radius: 22px;
  }

  .stage,
  .list-panel {
    padding: 18px;
  }

  .stage {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .workspace-layout,
  .sidebar-column,
  .center-column {
    gap: 16px;
  }

  .list-header {
    flex-direction: column;
    align-items: start;
  }

  .flashcard {
    row-gap: 8px;
    min-height: 860px;
    width: max-content;
    min-width: 100%;
    border-radius: 26px;
  }

  .flashcard[data-deck="pinyin"] .card-values {
    min-width: min(680px, calc(100vw - 92px));
    min-height: min(760px, 72vh);
  }

  .flashcard[data-deck="english"] .card-values {
    min-width: min(760px, calc(100vw - 92px));
    min-height: min(780px, 74vh);
  }

  .flashcard[data-deck="english"][data-mode="combined"] .card-values {
    min-width: min(980px, calc(100vw - 92px));
    min-height: min(640px, 62vh);
    padding-inline: 36px;
  }

  .tips {
    display: none;
  }

  .segmented,
  #deck-type-group,
  #font-group,
  #action-group {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .list-chip {
    flex: 1 1 calc(33.333% - 12px);
    min-width: 0;
  }
}