:root {
  color-scheme: light;
  --bg-top: #fbfdff;
  --bg-bottom: #fff8f0;
  --paper: rgba(255, 255, 255, 0.96);
  --paper-soft: rgba(255, 255, 255, 0.88);
  --ink: #1c2948;
  --muted: #78819a;
  --blue: #2f74ff;
  --blue-deep: #1f5fe0;
  --sky: #d9eeff;
  --teal: #36b99f;
  --teal-deep: #148f77;
  --green: #2eb569;
  --green-soft: #ecfff3;
  --orange: #ff9b42;
  --orange-soft: #fff5e6;
  --line: rgba(151, 175, 218, 0.24);
  --shadow: 0 18px 38px rgba(122, 138, 170, 0.14);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC",
    "Hiragino Sans GB", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(255, 214, 121, 0.22), transparent 18%),
    radial-gradient(circle at top right, rgba(118, 206, 255, 0.18), transparent 18%),
    radial-gradient(circle at bottom right, rgba(255, 164, 116, 0.16), transparent 18%),
    linear-gradient(180deg, var(--bg-top), var(--bg-bottom));
  overflow-x: hidden;
}

.bg-orb,
.bg-grid {
  position: fixed;
  pointer-events: none;
}

.bg-orb {
  width: 260px;
  height: 260px;
  border-radius: 50%;
  filter: blur(56px);
  opacity: 0.36;
}

.orb-one {
  top: -120px;
  right: -70px;
  background: radial-gradient(circle, rgba(104, 202, 255, 0.34), transparent 68%);
}

.orb-two {
  left: -110px;
  bottom: 12%;
  background: radial-gradient(circle, rgba(255, 199, 102, 0.34), transparent 68%);
}

.bg-grid {
  inset: 0;
  background-image: radial-gradient(rgba(150, 171, 207, 0.12) 1px, transparent 1px);
  background-size: 24px 24px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.12), transparent 84%);
}

.app-shell {
  width: min(860px, calc(100% - 28px));
  margin: 0 auto;
  padding: 14px 0 24px;
  position: relative;
  z-index: 1;
}

.control-panel,
.history-panel,
.quiz-panel,
.word-card {
  background: var(--paper);
  border: 1.5px solid rgba(207, 220, 243, 0.94);
  box-shadow:
    var(--shadow),
    inset 0 1px 0 rgba(255, 255, 255, 0.96);
}

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

.control-panel {
  margin-top: 0;
  padding: 16px 18px 18px;
  border-radius: 26px;
}

.title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand-lockup {
  display: inline-flex;
  align-items: center;
  min-width: 0;
}

.brand-title-art {
  display: block;
  width: 220px;
  height: 58px;
  object-fit: contain;
  transform: scaleX(1.08);
  transform-origin: left center;
}

.language-group {
  display: flex;
  align-items: center;
  gap: 3px;
  padding: 3px;
  border-radius: 999px;
  background: #f5f9ff;
  box-shadow: inset 0 0 0 1px rgba(173, 196, 232, 0.72);
}

.language-button,
.generate-button,
.speak-button,
.quiz-start-button,
.quiz-action-button,
.thumb-card,
.shuffle-button {
  border: 0;
  cursor: pointer;
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

.language-button:hover,
.generate-button:hover,
.speak-button:hover,
.quiz-start-button:hover,
.quiz-action-button:hover,
.thumb-card:hover,
.shuffle-button:hover {
  transform: translateY(-1px);
}

.language-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 34px;
  border-radius: 999px;
  background: transparent;
  color: var(--ink);
  font-size: 0.78rem;
  font-weight: 700;
  gap: 5px;
}

.language-button {
  padding: 0 11px;
}

.flag {
  font-size: 1rem;
  line-height: 1;
}

.language-button.active {
  background: linear-gradient(180deg, #4188ff, #296cf0);
  color: white;
  box-shadow:
    0 10px 18px rgba(79, 126, 217, 0.24),
    inset 0 1px 0 rgba(255, 255, 255, 0.26);
}

.generate-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 12px;
  margin-top: 10px;
}

.domain-field {
  display: block;
  position: relative;
}

.domain-icon {
  position: absolute;
  top: 50%;
  left: 14px;
  transform: translateY(-50%);
  color: var(--muted);
  font-size: 1.15rem;
  pointer-events: none;
}

.domain-input {
  width: 100%;
  min-height: 48px;
  padding: 0 16px 0 44px;
  border: 0;
  border-radius: 999px;
  background: linear-gradient(180deg, #fff, #fbfeff);
  box-shadow:
    inset 0 0 0 3px rgba(54, 185, 159, 0.78),
    0 10px 18px rgba(101, 187, 171, 0.08);
  color: var(--ink);
  font-size: 0.98rem;
  outline: none;
}

.domain-input::placeholder {
  color: var(--muted);
}

.domain-input:focus {
  box-shadow:
    inset 0 0 0 3px rgba(54, 185, 159, 1),
    0 0 0 5px rgba(54, 185, 159, 0.08);
}

.generate-button {
  width: 148px;
  min-height: 48px;
  border-radius: 26px;
  background:
    radial-gradient(circle at 24% 30%, rgba(255, 255, 255, 0.3), transparent 18%),
    linear-gradient(180deg, #4e94ff, #286aef);
  color: white;
  font-size: 1.02rem;
  font-weight: 800;
  letter-spacing: 0.01em;
  box-shadow:
    0 16px 28px rgba(43, 114, 224, 0.28),
    inset 0 1px 0 rgba(255, 255, 255, 0.3);
}

.generate-button:active {
  background: linear-gradient(180deg, var(--blue), var(--blue-deep));
}

.generate-button > span:first-child {
  margin-right: 5px;
  font-size: 0.9rem;
}

.generate-button:disabled,
.language-button:disabled {
  opacity: 0.7;
  cursor: wait;
}

.history-panel,
.quiz-panel {
  margin-top: 10px;
  padding: 12px 14px;
  border-radius: 28px;
  position: relative;
  overflow: hidden;
}

.history-panel {
  border-color: rgba(255, 211, 137, 0.92);
  box-shadow:
    0 12px 24px rgba(236, 193, 105, 0.12),
    inset 0 1px 0 rgba(255, 255, 255, 0.96);
}

.quiz-panel {
  border-color: rgba(154, 231, 185, 0.92);
  box-shadow:
    0 12px 24px rgba(118, 212, 149, 0.12),
    inset 0 1px 0 rgba(255, 255, 255, 0.96);
}

.history-topline,
.quiz-topline,
.quiz-card-topline,
.quiz-actions,
.card-topline,
.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.history-toggle,
.clear-history-button {
  border: 0;
  background: transparent;
  color: var(--ink);
  cursor: pointer;
}

.history-toggle {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  min-height: 40px;
  padding: 0 2px;
  font-size: 0.98rem;
  font-weight: 800;
}

.panel-copy {
  display: grid;
  gap: 2px;
  text-align: left;
}

.panel-copy strong {
  font-size: 0.95rem;
  line-height: 1.1;
}

.panel-copy small {
  color: var(--muted);
  font-size: 0.7rem;
  font-weight: 600;
  line-height: 1.1;
}

.section-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(255, 177, 47, 0.16);
  font-size: 0.94rem;
}

.history-count {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 30px;
  height: 30px;
  padding: 0 10px;
  border-radius: 999px;
  background: linear-gradient(180deg, #4a91ff, #276cff);
  color: white;
  font-size: 0.84rem;
  font-weight: 800;
  box-shadow: 0 8px 14px rgba(78, 130, 219, 0.18);
}

.clear-history-button {
  min-width: 42px;
  min-height: 42px;
  border-radius: 14px;
  background: linear-gradient(180deg, #fff7f1, #fff0e6);
  color: #f06d2f;
  font-size: 1rem;
  font-weight: 800;
  box-shadow: inset 0 0 0 1px rgba(255, 159, 72, 0.18);
}

.clear-history-button:disabled {
  opacity: 0.45;
  cursor: default;
}

.history-drawer {
  display: grid;
  gap: 10px;
  margin-top: 10px;
  position: relative;
  z-index: 1;
}

.history-empty {
  padding: 10px 4px 4px;
  color: var(--muted);
  font-size: 0.88rem;
}

.history-list,
.thumb-strip {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding-bottom: 2px;
  scroll-snap-type: x proximity;
}

.history-item {
  display: grid;
  gap: 8px;
  min-width: 152px;
  max-width: 188px;
  padding: 10px;
  border-radius: 20px;
  background: linear-gradient(180deg, #fff, #fffdf7);
  box-shadow:
    0 10px 18px rgba(204, 178, 117, 0.08),
    inset 0 0 0 1px rgba(241, 210, 147, 0.24);
  scroll-snap-align: start;
}

.history-open {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  width: 100%;
  padding: 0;
  border: 0;
  background: transparent;
  text-align: left;
  cursor: pointer;
}

.history-item-main {
  display: grid;
  gap: 4px;
}

.history-item-word {
  font-size: 0.95rem;
  font-weight: 700;
}

.history-item-reading,
.history-item-meta {
  color: var(--muted);
  font-size: 0.78rem;
}

.history-item-meta {
  text-align: right;
}

.quiz-start-button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-width: 166px;
  min-height: 42px;
  padding: 0 14px;
  border-radius: 999px;
  background: linear-gradient(180deg, #fbfffd, #ebfff4);
  color: var(--green);
  font-size: 0.94rem;
  font-weight: 800;
  box-shadow: inset 0 0 0 1px rgba(70, 187, 114, 0.18);
}

.quiz-score {
  display: grid;
  justify-items: end;
  gap: 2px;
}

.quiz-score strong {
  color: var(--green);
  font-size: 0.8rem;
}

.quiz-meta,
.quiz-lang-badge,
.quiz-counter {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 34px;
  padding: 0 12px;
  border-radius: 999px;
  background: linear-gradient(180deg, #f9fffb, #ecfff4);
  color: var(--green);
  font-size: 0.82rem;
  font-weight: 800;
}

.quiz-meta {
  min-height: 25px;
  padding: 0 9px;
  font-size: 0.7rem;
}

.quiz-card {
  margin-top: 10px;
  padding: 14px;
  border-radius: 24px;
  background: linear-gradient(180deg, rgba(248, 255, 251, 0.98), rgba(238, 255, 245, 0.98));
  box-shadow:
    inset 0 0 0 1px rgba(58, 168, 98, 0.08),
    0 10px 24px rgba(95, 148, 110, 0.08);
  position: relative;
  z-index: 1;
}

.panel-deco {
  position: absolute;
  pointer-events: none;
  opacity: 0.95;
}

.history-deco {
  right: 14px;
  top: 8px;
  width: 34px;
  transform: rotate(14deg);
}

.quiz-deco {
  right: 12px;
  bottom: 8px;
  width: 64px;
}

.quiz-collapse-button {
  width: 32px;
  height: 32px;
  border: 0;
  border-radius: 999px;
  background: rgba(40, 179, 111, 0.1);
  color: var(--green);
  font-size: 0.95rem;
  cursor: pointer;
}

.quiz-prompt {
  margin-top: 16px;
}

.quiz-label {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.quiz-prompt-text,
.quiz-meaning,
dd,
.example-origin {
  margin: 0;
  font-size: 0.96rem;
  line-height: 1.62;
}

.quiz-answer {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid rgba(17, 35, 62, 0.08);
}

.quiz-word {
  margin: 0;
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--green);
  letter-spacing: -0.03em;
}

.quiz-reading {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.quiz-meaning {
  margin-top: 10px;
}

.quiz-actions {
  margin-top: 16px;
}

.quiz-action-button {
  min-width: 76px;
  min-height: 40px;
  padding: 0 14px;
  border-radius: 14px;
  background: linear-gradient(180deg, #fff, #effff5);
  color: var(--green);
  font-size: 1rem;
  font-weight: 800;
  box-shadow: inset 0 0 0 1px rgba(40, 179, 111, 0.16);
}

.status-message {
  min-height: 0;
  margin: 6px 2px 0;
  color: var(--muted);
  font-size: 0.76rem;
  text-align: center;
}

.status-message:empty,
.hidden {
  display: none;
}

.results {
  display: grid;
  gap: 10px;
  margin-top: 10px;
}

.results-shell,
.results-stage {
  display: grid;
  gap: 10px;
}

.focus-card {
  position: relative;
  overflow: hidden;
  min-height: 220px;
  border-radius: 34px;
  background: #dcefff;
  box-shadow:
    0 18px 34px rgba(100, 139, 204, 0.18),
    inset 0 1px 0 rgba(255, 255, 255, 0.66);
}

.focus-banner-image {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 220px;
  object-fit: cover;
  object-position: center;
}

.shuffle-button {
  position: absolute;
  top: 30%;
  right: 4%;
  width: 20%;
  height: 42%;
  padding: 0;
  border-radius: 999px;
  background: transparent;
  color: transparent;
  font-size: 0;
  box-shadow: none;
  opacity: 0;
}

.shuffle-button:focus-visible {
  opacity: 1;
  outline: 3px solid rgba(47, 116, 255, 0.75);
  outline-offset: -4px;
}

.thumb-card {
  min-width: 118px;
  padding: 12px 14px;
  border-radius: 22px;
  background: linear-gradient(180deg, #fff, #fbfcff);
  color: var(--ink);
  text-align: left;
  box-shadow:
    0 10px 18px rgba(127, 145, 177, 0.1),
    inset 0 0 0 1px rgba(194, 208, 235, 0.42);
  scroll-snap-align: start;
}

.thumb-card.active {
  background: linear-gradient(180deg, #3d8cff, #2369ed);
  color: white;
  box-shadow:
    0 12px 20px rgba(112, 144, 203, 0.16),
    inset 0 0 0 1px rgba(42, 127, 255, 0.18);
}

.thumb-card.active .thumb-index {
  color: rgba(255, 255, 255, 0.78);
}

.thumb-index,
.thumb-word {
  display: block;
}

.thumb-index {
  color: var(--blue);
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.thumb-word {
  margin-top: 5px;
  font-size: 0.92rem;
  font-weight: 800;
}

.word-card {
  padding: 16px;
  border-radius: 28px;
  position: relative;
  overflow: hidden;
  background: linear-gradient(180deg, rgba(255, 254, 250, 0.98), rgba(255, 255, 255, 1));
}

.word-card::before {
  content: "";
  position: absolute;
  left: 16px;
  top: 18px;
  bottom: 18px;
  width: 8px;
  border-radius: 999px;
  background: linear-gradient(180deg, rgba(196, 221, 255, 0.72), rgba(233, 243, 255, 0.2));
}

.word-card::after {
  content: "";
  position: absolute;
  top: -18px;
  right: -18px;
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(72, 143, 255, 0.12), transparent 70%);
  pointer-events: none;
}

.word-card-deco {
  position: absolute;
  z-index: 1;
  pointer-events: none;
}

.word-card-deco-star {
  width: 28px;
  right: 18px;
  bottom: 16px;
  transform: rotate(12deg);
  opacity: 0.95;
}

.card-topline,
.card-header,
.card-content {
  position: relative;
  z-index: 1;
  margin-left: 18px;
}

.card-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 52px;
  height: 46px;
  margin-bottom: 8px;
  padding: 0 14px;
  border-radius: 18px;
  background: linear-gradient(180deg, #63d7b4, #31b989);
  color: white;
  font-size: 1.1rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  box-shadow: 0 10px 18px rgba(68, 183, 139, 0.22);
}

.card-tags {
  display: flex;
  align-items: center;
  gap: 8px;
}

.card-tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 36px;
  height: 24px;
  padding: 0 10px;
  border-radius: 999px;
  background: rgba(223, 236, 255, 0.9);
  color: var(--blue);
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  box-shadow: inset 0 0 0 1px rgba(10, 132, 255, 0.08);
}

.word {
  margin: 4px 0 0;
  font-size: 1.9rem;
  line-height: 1.06;
  letter-spacing: -0.04em;
}

.reading {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.speak-button {
  width: 56px;
  height: 56px;
  border-radius: 999px;
  background: linear-gradient(180deg, #fff, #edf3ff);
  box-shadow:
    0 12px 20px rgba(119, 140, 186, 0.14),
    inset 0 0 0 1px rgba(98, 135, 201, 0.16);
  font-size: 1.32rem;
}

.speak-button span {
  color: #2177f6;
}

.card-content {
  margin-top: 12px;
  padding: 12px 14px;
  border-radius: 20px;
  background: linear-gradient(180deg, rgba(245, 250, 255, 0.98), rgba(255, 255, 255, 1));
  box-shadow:
    inset 0 0 0 1px rgba(100, 139, 204, 0.14),
    0 4px 10px rgba(152, 170, 203, 0.06);
}

.card-row {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 12px;
  align-items: start;
  padding: 10px 0;
  border-top: 1px solid var(--line);
}

.card-row:first-child {
  padding-top: 0;
  border-top: 0;
}

dt {
  margin: 0;
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 800;
  line-height: 1.8;
  text-align: center;
}

dd {
  font-size: 0.94rem;
}

.example-cn {
  color: var(--muted);
}

.card-row-example dt,
.card-row-translation dt {
  border-radius: 999px;
  background: rgba(18, 49, 95, 0.06);
}

.card-row-meaning dt {
  font-size: 1.05rem;
}

.card-row-meaning {
  display: block;
  padding-bottom: 12px;
}

.card-row-meaning .meaning {
  color: #304263;
  font-size: 1.02rem;
  font-weight: 700;
}

.card-row-example {
  padding-top: 12px;
  border-top: 1px dashed rgba(151, 175, 218, 0.32);
}

.card-row-example dt {
  display: inline-flex;
  width: max-content;
  min-width: 34px;
  padding: 2px 8px;
  margin-bottom: 6px;
  color: var(--blue);
  background: #eaf3ff;
  font-size: 0.68rem;
}

.card-row-example dd {
  grid-column: 1 / -1;
}

.card-row-translation {
  display: block;
  padding-top: 4px;
  border-top: 0;
}

.card-row-translation dt {
  display: none;
}

.learning-feedback {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin: 14px 0 0 18px;
}

.feedback-button {
  min-height: 42px;
  border: 0;
  border-radius: 15px;
  cursor: pointer;
  font-size: 0.86rem;
  font-weight: 800;
  transition: transform 160ms ease, box-shadow 160ms ease;
}

.feedback-button:hover {
  transform: translateY(-1px);
}

.feedback-review {
  background: #fff6ec;
  color: #d97b2c;
  box-shadow: inset 0 0 0 1px rgba(241, 167, 84, 0.24);
}

.feedback-known {
  background: #eafff3;
  color: var(--green);
  box-shadow: inset 0 0 0 1px rgba(48, 181, 105, 0.24);
}

.feedback-button.selected {
  box-shadow: 0 8px 14px rgba(101, 139, 184, 0.16), inset 0 0 0 2px currentColor;
}

@media (max-width: 640px) {
  .app-shell {
    width: min(100% - 18px, 100%);
    padding: 12px 0 20px;
  }

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

  .title-row {
    align-items: flex-start;
  }

  .brand-title-art {
    width: 166px;
    height: 44px;
    transform: scaleX(1.05);
  }

  .language-button {
    min-height: 32px;
    padding: 0 8px;
    font-size: 0.72rem;
  }

  .generate-row {
    grid-template-columns: minmax(0, 1fr) 104px;
    gap: 10px;
  }

  .generate-button {
    width: 120px;
    padding: 0 8px;
    font-size: 0.86rem;
  }

  .focus-card {
    min-height: 132px;
    border-radius: 26px;
  }

  .focus-banner-image {
    min-height: 132px;
  }

  .shuffle-button {
    top: 29%;
    right: 3%;
    width: 24%;
    height: 44%;
  }

  .thumb-card {
    min-width: 98px;
    padding: 10px 12px;
  }

  .history-item {
    min-width: 136px;
  }

  .word-card {
    padding: 14px;
    border-radius: 24px;
  }

  .card-topline,
  .card-header,
  .card-content {
    margin-left: 12px;
  }

  .learning-feedback {
    margin-left: 12px;
  }

  .word {
    font-size: 1.52rem;
  }

  .speak-button {
    width: 48px;
    height: 48px;
    font-size: 1.16rem;
  }

  .word-card-deco-star {
    width: 22px;
    right: 14px;
    bottom: 12px;
  }
}