:root {
  --color-primary: #1a75a9;
  --color-secondary: #d4ccd0;
  --color-accent: #040f1e;
  --color-background: #f4f7fb;
  --color-card-bg: #ffffff;
  --color-card-hover: #e1f1fb;
  --color-card-selected: #1a75a9;
  --color-card-selected-text: #ffffff;
  --shadow-soft: 0 12px 24px rgba(4, 15, 30, 0.12);
  --shadow-hover: 0 16px 28px rgba(4, 15, 30, 0.18);
  --radius-large: 18px;
  --radius-medium: 14px;
  --radius-small: 10px;
  --transition-slow: 280ms ease;
  --transition-fast: 160ms ease;
}

* {
  box-sizing: border-box;
}

body {
  font-family: "Nunito", "PingFang TC", "Microsoft JhengHei", sans-serif;
  margin: 0;
  min-height: 100vh;
  background: radial-gradient(circle at 10% 20%, rgba(26, 117, 169, 0.08), transparent), radial-gradient(circle at 80% 0%, rgba(4, 15, 30, 0.08), transparent), var(--color-background);
  color: var(--color-accent);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image: radial-gradient(circle at 20% 30%, rgba(26, 117, 169, 0.18) 0 18%, transparent 32%), radial-gradient(circle at 80% 70%, rgba(244, 167, 188, 0.24) 0 20%, transparent 36%);
  background-size: 140px 140px;
  background-repeat: repeat;
  opacity: 0.08;
  pointer-events: none;
  z-index: -1;
}

.site-header {
  padding: 2.5rem 1.5rem 1.5rem;
}

.header-content {
  width: min(1180px, 92vw);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2.5rem;
}

.header-text {
  max-width: 460px;
}

.site-header h1 {
  margin: 0;
  font-size: 2.75rem;
  color: var(--color-primary);
}

.site-header p {
  margin: 0.5rem 0 0;
  font-size: 1.1rem;
  color: rgba(4, 15, 30, 0.7);
}

.header-visual {
  flex: 0 0 240px;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.header-visual::after {
  content: "";
  position: absolute;
  width: 220px;
  height: 220px;
  background: radial-gradient(circle, rgba(255, 245, 247, 0.9) 0 55%, transparent 70%);
  z-index: -1;
  filter: blur(2px);
}

.cat-illustration {
  width: 200px;
  height: auto;
  filter: drop-shadow(0 12px 24px rgba(4, 15, 30, 0.16));
  animation: catFloat 4s ease-in-out infinite;
}

@keyframes catFloat {
  0% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-8px);
  }
  100% {
    transform: translateY(0px);
  }
}

.layout {
  width: min(1200px, 92vw);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 4fr) minmax(260px, 2fr);
  gap: 1.5rem;
  padding-bottom: 4.5rem;
}

.card-panel {
  background: rgba(255, 255, 255, 0.8);
  border-radius: var(--radius-large);
  padding: 1.5rem;
  box-shadow: var(--shadow-soft);
  backdrop-filter: blur(6px);
  display: flex;
  flex-direction: column;
}

.panel-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.progress-indicator {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

#progress-count {
  font-weight: 600;
}

.progress-bar {
  width: 180px;
  height: 8px;
  background: var(--color-secondary);
  border-radius: 999px;
  overflow: hidden;
}

#progress-bar-fill {
  width: 0%;
  height: 100%;
  background: linear-gradient(135deg, var(--color-primary), #2f8dc3);
  border-radius: inherit;
  transition: width var(--transition-slow);
}

.progress-indicator.shake {
  animation: shake 0.4s ease;
}

@keyframes shake {
  0% {
    transform: translateX(0);
  }
  20% {
    transform: translateX(-6px);
  }
  40% {
    transform: translateX(6px);
  }
  60% {
    transform: translateX(-4px);
  }
  80% {
    transform: translateX(4px);
  }
  100% {
    transform: translateX(0);
  }
}

.page-controls {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.page-status {
  font-weight: 600;
  color: rgba(4, 15, 30, 0.6);
}

.page-nav {
  border: none;
  background: rgba(26, 117, 169, 0.12);
  color: var(--color-primary);
  font-weight: 700;
  width: 2.4rem;
  height: 2.4rem;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 8px 18px rgba(4, 15, 30, 0.12);
  transition: background var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

.page-nav:hover,
.page-nav:focus-visible {
  background: rgba(26, 117, 169, 0.24);
  transform: translateY(-2px);
  outline: none;
}

.page-nav:disabled {
  cursor: not-allowed;
  opacity: 0.45;
  transform: none;
  box-shadow: none;
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 0.85rem 0.75rem;
  margin-bottom: 1.25rem;
}

.value-card {
  border: none;
  border-radius: var(--radius-medium);
  background: var(--color-card-bg);
  padding: 1.1rem 0.75rem;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-accent);
  cursor: pointer;
  box-shadow: var(--shadow-soft);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast), color var(--transition-fast);
  position: relative;
}

.value-card::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  border: 2px solid transparent;
  transition: border-color var(--transition-fast);
}

.value-card:hover,
.value-card:focus-visible {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  background: var(--color-card-hover);
  outline: none;
}

.value-card.selected {
  background: var(--color-card-selected);
  color: var(--color-card-selected-text);
  transform: translateY(-6px) scale(1.02);
}

.value-card.selected::after {
  border-color: rgba(255, 255, 255, 0.8);
}

.value-card.is-disabled {
  cursor: not-allowed;
  opacity: 0.65;
}


.summary-panel {
  position: relative;
  background: var(--color-card-bg);
  border-radius: var(--radius-large);
  padding: 1.5rem;
  box-shadow: var(--shadow-soft);
  backdrop-filter: blur(6px);
  display: flex;
  flex-direction: column;
  gap: 1rem;
  transition: max-height var(--transition-slow), transform var(--transition-slow), box-shadow var(--transition-fast);
}

.summary-toggle {
  display: none;
}

.summary-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.summary-header h2 {
  margin: 0;
  font-size: 1.3rem;
  color: var(--color-primary);
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.summary-header h2::after {
  content: "";
  width: 18px;
  height: 18px;
  background:
    radial-gradient(circle at 50% 60%, rgba(26, 117, 169, 0.9) 0 48%, transparent 54%),
    radial-gradient(circle at 22% 18%, rgba(26, 117, 169, 0.9) 0 34%, transparent 46%),
    radial-gradient(circle at 78% 18%, rgba(26, 117, 169, 0.9) 0 34%, transparent 46%),
    radial-gradient(circle at 28% 80%, rgba(26, 117, 169, 0.9) 0 28%, transparent 44%),
    radial-gradient(circle at 72% 80%, rgba(26, 117, 169, 0.9) 0 28%, transparent 44%);
  filter: drop-shadow(0 2px 4px rgba(4, 15, 30, 0.1));
}

.copy-button {
  border: none;
  background: var(--color-primary);
  color: white;
  padding: 0.55rem 1rem;
  border-radius: 999px;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 8px 18px rgba(26, 117, 169, 0.28);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.copy-button::before {
  content: "喵";
  font-size: 0.85rem;
  font-weight: 700;
}

.copy-button:hover,
.copy-button:focus-visible {
  transform: translateY(-2px);
  box-shadow: 0 12px 24px rgba(26, 117, 169, 0.35);
  outline: none;
}

.summary-subtitle {
  margin: 0 0 0.85rem;
  color: rgba(4, 15, 30, 0.6);
}

.selected-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.selected-list li {
  background: rgba(26, 117, 169, 0.15);
  border-radius: 999px;
  padding: 0.4rem 0.9rem;
  font-weight: 600;
  color: var(--color-accent);
  line-height: 1.2;
  transition: transform var(--transition-fast), background var(--transition-fast), box-shadow var(--transition-fast);
  box-shadow: 0 4px 10px rgba(4, 15, 30, 0.08);
}

.selected-list li:hover {
  background: rgba(26, 117, 169, 0.25);
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(4, 15, 30, 0.16);
}

.limit-hint {
  margin-top: 0.5rem;
  color: #d04f5b;
  font-weight: 600;
  min-height: 1.2rem;
}

.limit-hint.hidden {
  display: none;
}

.site-footer {
  margin-top: auto;
  text-align: center;
  padding: 2rem 1rem 2.5rem;
  color: rgba(4, 15, 30, 0.6);
  font-size: 0.95rem;
}

.site-footer a {
  color: var(--color-primary);
  font-weight: 700;
}

.site-footer a:hover,
.site-footer a:focus-visible {
  text-decoration: underline;
  outline: none;
}

@media (max-width: 1200px) {
  .cards-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 961px) {
  .summary-panel {
    position: sticky;
    top: 1.5rem;
    height: fit-content;
  }
}

@media (max-width: 960px) {
  .header-content {
    flex-direction: column;
    text-align: center;
    gap: 1.8rem;
  }

  .header-text {
    max-width: 100%;
  }

  .header-visual {
    flex: none;
  }

  .cat-illustration {
    width: 180px;
  }

  .layout {
    width: min(640px, 94vw);
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }

  .summary-panel {
    position: fixed;
    bottom: 1.2rem;
    left: 50%;
    transform: translateX(-50%);
    width: clamp(18rem, 92vw, 28rem);
    padding: 0.9rem 1.1rem 1.25rem;
    z-index: 1000;
    box-shadow: 0 12px 32px rgba(4, 15, 30, 0.22);
    border-radius: 22px;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.95) 0%, rgba(244, 247, 251, 0.95) 70%, rgba(255, 255, 255, 0.9) 100%);
    border: 1px solid rgba(26, 117, 169, 0.14);
  }

  .summary-toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    border: none;
    background: transparent;
    color: var(--color-accent);
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    padding: 0.2rem 0;
  }

  .summary-toggle::after {
    content: "";
    display: inline-block;
    width: 14px;
    height: 14px;
    border-right: 3px solid var(--color-primary);
    border-bottom: 3px solid var(--color-primary);
    transform: rotate(45deg);
    transition: transform var(--transition-fast);
    margin-left: 0.5rem;
  }

  .summary-panel[data-expanded="true"] .summary-toggle::after {
    transform: rotate(-135deg);
  }

  .summary-content {
    max-height: 24rem;
    overflow: auto;
    transition: max-height var(--transition-slow), opacity var(--transition-slow);
    background: rgba(255, 255, 255, 0.92);
    border-radius: 18px;
    padding: 0.85rem 0.85rem 0.5rem;
    margin-top: 0.6rem;
  }

  .summary-panel[data-expanded="false"] .summary-content {
    max-height: 0;
    opacity: 0;
    pointer-events: none;
    padding: 0;
    margin-top: 0;
  }

  .summary-panel[data-expanded="false"] {
    padding-bottom: 0.75rem;
  }

  .summary-panel[data-expanded="false"] .summary-header,
  .summary-panel[data-expanded="false"] .summary-subtitle,
  .summary-panel[data-expanded="false"] .selected-list,
  .summary-panel[data-expanded="false"] .limit-hint {
    opacity: 0;
  }

  .panel-top {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 1rem 1.1rem;
    background: rgba(255, 255, 255, 0.92);
    border-radius: 18px;
    box-shadow: 0 10px 28px rgba(4, 15, 30, 0.12);
  }

  .progress-bar {
    width: 200px;
  }

  .cards-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    background: rgba(255, 255, 255, 0.9);
    border-radius: 18px;
    padding: 1rem 1.1rem 1.2rem;
    box-shadow: 0 10px 30px rgba(4, 15, 30, 0.12);
  }

  .card-panel {
    background: transparent;
    padding: 0 0 7.5rem;
    gap: 1.1rem;
  }
}

@media (max-width: 540px) {
  body {
    font-size: 15px;
  }

  .site-header h1 {
    font-size: 2.1rem;
  }

  .site-header p {
    font-size: 1rem;
  }

  .cards-grid {
    grid-template-columns: repeat(2, minmax(140px, 1fr));
    gap: 0.8rem;
    padding: 0.85rem 0.85rem 1rem;
  }

  .value-card {
    padding: 1rem 0.6rem;
    font-size: 1rem;
  }
}