:root {
  --md-sys-font: "Zen Maru Gothic", "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
  --md-sys-primary: #b6c4ff;
  --md-sys-on-primary: #112a64;
  --md-sys-primary-container: #26408b;
  --md-sys-on-primary-container: #dbe1ff;
  --md-sys-secondary: #c4c6dd;
  --md-sys-on-secondary: #2b2e41;
  --md-sys-secondary-container: #424558;
  --md-sys-on-secondary-container: #e0e1f9;
  --md-sys-tertiary: #e1bad9;
  --md-sys-on-tertiary: #432741;
  --md-sys-tertiary-container: #5a3d58;
  --md-sys-on-tertiary-container: #fdd7f6;
  --md-sys-surface: #11131a;
  --md-sys-surface-variant: #2a2d3a;
  --md-sys-on-surface: #e4e6f1;
  --md-sys-on-surface-variant: #c5c7d6;
  --md-sys-outline: #8f91a1;
  --md-sys-shadow: rgba(0, 0, 0, 0.45);
  --md-sys-outline-variant: #3a3d4c;
  --md-sys-success: #74d39a;
  --md-sys-on-success: #0a2b17;
  --md-sys-surface-tint: #b6c4ff;
}

@media (prefers-color-scheme: light) {
  :root {
    --md-sys-primary: #3058c7;
    --md-sys-on-primary: #ffffff;
    --md-sys-primary-container: #dfe6ff;
    --md-sys-on-primary-container: #0b1b4a;
    --md-sys-secondary: #5a5d72;
    --md-sys-on-secondary: #ffffff;
    --md-sys-secondary-container: #e0e1f9;
    --md-sys-on-secondary-container: #161a2c;
    --md-sys-tertiary: #735370;
    --md-sys-on-tertiary: #ffffff;
    --md-sys-tertiary-container: #fdd7f6;
    --md-sys-on-tertiary-container: #2a0f28;
    --md-sys-surface: #fbfcff;
    --md-sys-surface-variant: #e2e4f2;
    --md-sys-on-surface: #1a1b21;
    --md-sys-on-surface-variant: #444655;
    --md-sys-outline: #747785;
    --md-sys-shadow: rgba(11, 15, 32, 0.22);
    --md-sys-outline-variant: #c5c7d6;
    --md-sys-success: #1b6e3a;
    --md-sys-on-success: #ffffff;
    --md-sys-surface-tint: #3058c7;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--md-sys-font);
  background: radial-gradient(circle at 15% 15%, rgba(48, 88, 199, 0.12), transparent 55%),
    radial-gradient(circle at 85% 20%, rgba(115, 83, 112, 0.18), transparent 55%),
    linear-gradient(180deg, var(--md-sys-surface), var(--md-sys-surface-variant));
  color: var(--md-sys-on-surface);
}

a {
  color: var(--md-sys-primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 32px 20px 64px;
}

header {
  padding: 24px;
  border-radius: 24px;
  background: linear-gradient(135deg, rgba(48, 88, 199, 0.15), rgba(115, 83, 112, 0.2));
  box-shadow: 0 20px 40px var(--md-sys-shadow);
  backdrop-filter: blur(12px);
  border: 1px solid var(--md-sys-outline-variant);
  position: relative;
  overflow: hidden;
}

header::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 70% 20%, rgba(255, 255, 255, 0.2), transparent 45%);
  opacity: 0.4;
  pointer-events: none;
}

h1 {
  font-size: clamp(2rem, 3vw, 3rem);
  margin: 0 0 12px;
  letter-spacing: 0.02em;
}

.subtitle {
  font-size: 1rem;
  color: var(--md-sys-on-surface-variant);
  margin: 0 0 8px;
}

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

.chip {
  border-radius: 999px;
  padding: 6px 14px;
  font-size: 0.85rem;
  background: var(--md-sys-primary-container);
  color: var(--md-sys-on-primary-container);
  border: 1px solid transparent;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 20px 0 0;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 18px;
  border-radius: 999px;
  border: 1px solid transparent;
  background: var(--md-sys-primary);
  color: var(--md-sys-on-primary);
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  text-decoration: none;
}

.button.secondary {
  background: var(--md-sys-secondary-container);
  color: var(--md-sys-on-secondary-container);
}

.button:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 18px var(--md-sys-shadow);
  text-decoration: none;
}

.icon-button {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  border: none;
  background: transparent;
  color: var(--md-sys-on-surface-variant);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease, color 0.2s ease;
}

.icon-button:hover {
  transform: translateY(-2px);
  background: color-mix(in srgb, var(--md-sys-primary) 18%, transparent);
  color: var(--md-sys-on-surface);
  box-shadow: 0 10px 18px var(--md-sys-shadow);
}

.icon-button:active {
  transform: translateY(0);
  box-shadow: none;
  background: color-mix(in srgb, var(--md-sys-primary) 28%, transparent);
}

.section-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin: 40px 0 16px;
  gap: 12px;
}

.section-title h2 {
  margin: 0;
  font-size: 1.4rem;
}

.section-title span {
  font-size: 0.9rem;
  color: var(--md-sys-on-surface-variant);
}

.grid {
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.card {
  position: relative;
  padding: 20px;
  border-radius: 20px;
  background: color-mix(in srgb, var(--md-sys-surface) 80%, var(--md-sys-primary-container));
  border: 1px solid var(--md-sys-outline-variant);
  box-shadow: 0 10px 25px var(--md-sys-shadow);
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-height: 170px;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.card.is-clickable {
  cursor: pointer;
}

.card.is-clickable:hover {
  transform: translateY(-6px);
  box-shadow: 0 18px 30px var(--md-sys-shadow);
}

.card h3 {
  margin: 0;
  font-size: 1.1rem;
}

.card p {
  margin: 0;
  color: var(--md-sys-on-surface-variant);
  font-size: 0.95rem;
  line-height: 1.5;
}

.surface-card {
  border: 1px solid var(--md-sys-outline-variant);
  background: color-mix(in srgb, var(--md-sys-surface) 80%, var(--md-sys-primary-container));
  box-shadow: 0 10px 25px var(--md-sys-shadow);
}

.form-grid {
  display: grid;
  gap: 12px;
}

.input-row {
  display: grid;
  grid-template-columns: 140px minmax(0, 1fr);
  gap: 8px 10px;
  align-items: center;
}

.input-row label {
  font-weight: 600;
  margin: 0;
}

.input-row input,
.input-row select {
  grid-column: 2;
  width: 100%;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid var(--md-sys-outline-variant);
  background: var(--md-sys-surface);
  color: var(--md-sys-on-surface);
  font-size: 0.95rem;
}

.input-row input[type="hidden"] {
  display: none;
}

.input-row .chip-group {
  grid-column: 2;
}

.toggle-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid var(--md-sys-outline-variant);
  background: var(--md-sys-surface);
}

.toggle-item input {
  width: 18px;
  height: 18px;
}

.result-card {
  display: grid;
  gap: 6px;
  padding: 10px 12px;
  border-radius: 12px;
  background: var(--md-sys-surface);
  border: 1px solid var(--md-sys-outline-variant);
}

.result-row {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 8px;
}

.result-label {
  color: var(--md-sys-on-surface-variant);
  font-size: 0.9rem;
  text-transform: none;
  letter-spacing: normal;
}

.result-value {
  font-size: 1rem;
  font-weight: 700;
  text-align: right;
}

.calc-output-panel {
  position: sticky;
  top: 8px;
  z-index: 20;
  margin: 10px 0 14px;
}

.calc-output-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.calc-output-item {
  padding: 0;
  border: none;
  background: transparent;
  box-shadow: none;
  display: grid;
  gap: 10px;
}

.calc-output-item > h3 {
  margin: 0 0 2px;
}

.result-pair-list {
  display: grid;
  gap: 10px;
}

.result-pair-item {
  display: grid;
  gap: 4px;
}

.chip-group {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chip-button {
  border-radius: 999px;
  padding: 8px 14px;
  font-size: 0.9rem;
  border: 1px solid var(--md-sys-outline-variant);
  background: var(--md-sys-surface);
  color: var(--md-sys-on-surface-variant);
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.chip-button.is-active {
  background: color-mix(in srgb, var(--md-sys-primary-container) 70%, var(--md-sys-surface));
  color: var(--md-sys-on-primary-container);
  border-color: transparent;
  box-shadow: 0 6px 12px color-mix(in srgb, var(--md-sys-shadow) 60%, transparent);
}

.chip-button.chip-rarity-bronze {
  background: var(--md-sys-surface);
  color: var(--md-sys-on-surface-variant);
  border-color: #4e8d7c;
}

.chip-button.chip-rarity-silver {
  background: var(--md-sys-surface);
  color: var(--md-sys-on-surface-variant);
  border-color: #c7cdd3;
}

.chip-button.chip-rarity-gold {
  background: var(--md-sys-surface);
  color: var(--md-sys-on-surface-variant);
  border-color: #d9b348;
}

.chip-button.chip-rarity-platinum {
  background: var(--md-sys-surface);
  color: var(--md-sys-on-surface-variant);
  border-color: #e089c1;
}

.chip-button.is-active.chip-rarity-bronze {
  background: color-mix(in srgb, #4e8d7c 70%, var(--md-sys-surface));
  color: #04100c;
  box-shadow: 0 0 0 1px color-mix(in srgb, #4e8d7c 70%, transparent);
}

.chip-button.is-active.chip-rarity-silver {
  background: color-mix(in srgb, #c7cdd3 70%, var(--md-sys-surface));
  color: #0b0f12;
  box-shadow: 0 0 0 1px color-mix(in srgb, #c7cdd3 70%, transparent);
}

.chip-button.is-active.chip-rarity-gold {
  background: color-mix(in srgb, #d9b348 70%, var(--md-sys-surface));
  color: #1a1200;
  box-shadow: 0 0 0 1px color-mix(in srgb, #d9b348 70%, transparent);
}

.chip-button.is-active.chip-rarity-platinum {
  background: color-mix(in srgb, #e089c1 70%, var(--md-sys-surface));
  color: #1a0012;
  box-shadow: 0 0 0 1px color-mix(in srgb, #e089c1 70%, transparent);
}

.hint {
  margin: 0;
  font-size: 0.9rem;
  color: var(--md-sys-on-surface-variant);
  line-height: 1.6;
}

.divider {
  border-top: 1px solid var(--md-sys-outline-variant);
}

.is-hidden {
  display: none;
}

.card-media {
  width: 200px;
  height: 280px;
  border-radius: 16px;
  border: 1px solid var(--md-sys-outline-variant);
  background: color-mix(in srgb, var(--md-sys-surface) 85%, var(--md-sys-primary-container));
  overflow: hidden;
  margin: 0 auto;
  max-width: 100%;
}

.card-image {
  width: 100%;
  height: auto;
  display: block;
}

.copy-hint {
  font-size: 0.85rem;
  color: var(--md-sys-on-surface-variant);
  margin: 0;
}

.card .status {
  margin-top: auto;
  font-size: 0.85rem;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--md-sys-success);
}

.status::before {
  content: "";
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--md-sys-success);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--md-sys-success) 25%, transparent);
}

.list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.list li {
  padding: 14px 16px;
  border-radius: 16px;
  background: var(--md-sys-surface);
  border: 1px solid var(--md-sys-outline-variant);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.list strong {
  font-size: 1rem;
}

.list span {
  color: var(--md-sys-on-surface-variant);
  font-size: 0.9rem;
}

.steps {
  margin: 0;
  padding-left: 20px;
  display: grid;
  gap: 10px;
  color: var(--md-sys-on-surface-variant);
  font-size: 0.95rem;
  line-height: 1.6;
}

.steps li {
  padding: 12px 14px;
  border-radius: 14px;
  background: var(--md-sys-surface);
  border: 1px solid var(--md-sys-outline-variant);
}

.note {
  padding: 14px 16px;
  border-radius: 16px;
  background: var(--md-sys-surface);
  border: 1px solid var(--md-sys-outline-variant);
  color: var(--md-sys-on-surface-variant);
  font-size: 0.95rem;
  line-height: 1.6;
}

.placeholder {
  padding: 16px;
  border-radius: 16px;
  border: 1px dashed var(--md-sys-outline);
  color: var(--md-sys-on-surface-variant);
  text-align: center;
  background: color-mix(in srgb, var(--md-sys-surface) 90%, var(--md-sys-primary-container));
  font-size: 0.9rem;
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  transform: translateX(-50%) translateY(10px);
  background: var(--md-sys-secondary-container);
  color: var(--md-sys-on-secondary-container);
  padding: 12px 18px;
  border-radius: 999px;
  box-shadow: 0 12px 22px var(--md-sys-shadow);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
  font-size: 0.9rem;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

footer {
  margin-top: 48px;
  padding: 20px 0 0;
  border-top: 1px solid var(--md-sys-outline-variant);
  color: var(--md-sys-on-surface-variant);
  font-size: 0.85rem;
  text-align: center;
}

.reveal {
  opacity: 0;
  transform: translateY(16px);
  animation: fadeUp 0.8s ease forwards;
}

.reveal:nth-child(2) {
  animation-delay: 0.1s;
}

.reveal:nth-child(3) {
  animation-delay: 0.2s;
}

.reveal:nth-child(4) {
  animation-delay: 0.3s;
}

@keyframes fadeUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 700px) {
  header {
    padding: 20px;
  }

  .card {
    min-height: auto;
  }

  .input-row {
    grid-template-columns: 110px minmax(0, 1fr);
  }
}