:root {
  --bg: #fafafa;
  --surface: #ffffff;
  --text: #15171c;
  --text-muted: #6b7076;
  --border: #e2e2e5;
  --border-strong: #c9cacd;
  --accent-start: #4b5568;
  --accent-end: #262b36;
  --accent-solid: #363c48;
  --radius: 2px;
}

* {
  box-sizing: border-box;
}

body {
  font-family: -apple-system, "Hiragino Sans", "Yu Gothic", sans-serif;
  max-width: 760px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--text);
}

header {
  position: sticky;
  top: 0;
  z-index: 10;
  margin-bottom: 2rem;
  padding: 1rem 1.5rem 1rem;
  margin-left: -1.5rem;
  margin-right: -1.5rem;
  background: var(--bg);
  border-bottom: 1px solid var(--border-strong);
}

.header-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.logo {
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0.06em;
  color: var(--text);
  text-decoration: none;
}

nav {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  flex-wrap: wrap;
  font-size: 0.82rem;
}

.nav-toggle {
  display: none;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  font-size: 1.2rem;
  line-height: 1;
  padding: 0.35rem 0.6rem;
  cursor: pointer;
}

footer {
  margin-top: 3rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  display: flex;
  gap: 1rem;
  font-size: 0.75rem;
}

footer a {
  color: var(--text-muted);
  text-decoration: none;
}

footer a:hover {
  color: var(--text);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

nav a {
  color: var(--text-muted);
  text-decoration: none;
  letter-spacing: 0.02em;
}

nav a:hover {
  color: var(--text);
}

.inline-form {
  display: inline;
}

.inline-form button {
  border: none;
  background: none;
  color: var(--text-muted);
  cursor: pointer;
  font: inherit;
  letter-spacing: 0.02em;
  padding: 0;
}

.inline-form button:hover {
  color: var(--text);
}

h1 {
  position: relative;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  margin: 0 0 0.9rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-strong);
  display: inline-block;
}

h1::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-start), var(--accent-end));
  animation: ten-dot-travel 8s ease-in-out infinite;
}

@keyframes ten-dot-travel {
  0% {
    left: 0;
    opacity: 0;
  }
  15% {
    opacity: 1;
  }
  85% {
    opacity: 1;
  }
  100% {
    left: calc(100% - 8px);
    opacity: 0;
  }
}

h2 {
  font-size: 1rem;
  font-weight: 600;
  margin: 0 0 0.4rem;
}

.subtitle {
  color: var(--text-muted);
  margin-top: 0;
}

section {
  margin-bottom: 2.75rem;
}

.ranking-list {
  list-style: none;
  counter-reset: rank;
  padding: 0;
  margin: 0;
}

.ranking-list li {
  counter-increment: rank;
  position: relative;
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-rows: auto auto;
  column-gap: 0.75rem;
  align-items: baseline;
  padding: 0.6rem 0 0.6rem 1.6rem;
  border-bottom: 1px solid var(--border);
}

.ranking-list li::before {
  content: counter(rank);
  position: absolute;
  left: 0;
  top: 0.65rem;
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.ranking-list a {
  grid-column: 1;
  grid-row: 1;
  color: var(--text);
  font-weight: 600;
  text-decoration: none;
}

.ranking-list a:hover {
  text-decoration: underline;
}

.ranking-list .meta {
  grid-column: 1;
  grid-row: 2;
  margin: 0;
}

.ranking-list .score {
  grid-column: 2;
  grid-row: 1 / span 2;
  align-self: center;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--accent-solid);
  white-space: nowrap;
}

.search-form {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.search-form input[type="text"] {
  flex: 1;
  padding: 0.55rem 0.7rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  background: var(--surface);
  font: inherit;
}

.search-form button {
  padding: 0.55rem 1.2rem;
  border: none;
  border-radius: var(--radius);
  background: linear-gradient(135deg, var(--accent-start), var(--accent-end));
  color: #fff;
  font-weight: 600;
  letter-spacing: 0.02em;
  cursor: pointer;
}

.chip-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  align-items: center;
  margin-bottom: 0.75rem;
}

.section-divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 1.75rem 0;
}

.chip-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-right: 0.25rem;
  letter-spacing: 0.02em;
}

.chip {
  display: inline-block;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius);
  border: 1px solid var(--border-strong);
  background: var(--surface);
  color: var(--text);
  font-size: 0.78rem;
  text-decoration: none;
}

.chip:hover {
  border-color: var(--text);
}

.chip.active {
  background: linear-gradient(135deg, var(--accent-start), var(--accent-end));
  border-color: transparent;
  color: #fff;
}

.auth-form {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
  max-width: 360px;
}

.auth-form label {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  letter-spacing: 0.02em;
}

.auth-form input {
  padding: 0.55rem 0.7rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  font: inherit;
  color: var(--text);
}

.auth-form button {
  align-self: flex-start;
  padding: 0.55rem 1.4rem;
  border: none;
  border-radius: var(--radius);
  background: linear-gradient(135deg, var(--accent-start), var(--accent-end));
  color: #fff;
  font-weight: 600;
  letter-spacing: 0.02em;
  cursor: pointer;
}

.rating-list {
  list-style: none;
  padding: 0;
}

.rating-list li {
  padding: 0.4rem 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.92rem;
}

.my-rating {
  font-weight: 600;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  display: inline-block;
}

.flash {
  list-style: none;
  padding: 0.7rem 1rem;
  margin: 0 0 1.5rem;
  background: var(--surface);
  border-left: 3px solid var(--accent-solid);
  border-radius: var(--radius);
  font-size: 0.9rem;
}

.empty {
  color: var(--text-muted);
}

.exhibition-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.exhibition-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.1rem 1.3rem;
  margin-bottom: 0.9rem;
}

.exhibition-card h2 {
  font-size: 1.05rem;
  margin: 0 0 0.4rem;
}

.exhibition-card h2 a {
  color: var(--text);
  text-decoration: none;
}

.exhibition-card h2 a:hover {
  text-decoration: underline;
}

.meta {
  color: var(--text-muted);
  font-size: 0.88rem;
  margin: 0 0 0.5rem;
}

.rated-date {
  color: var(--text-muted);
  font-size: 0.85rem;
  font-weight: 400;
}

.status {
  display: inline-block;
  margin-left: 0.5rem;
  padding: 0.05rem 0.55rem;
  font-size: 0.75rem;
  border-radius: var(--radius);
  border: 1px solid var(--border-strong);
  color: var(--text-muted);
}

.score {
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--accent-solid);
  margin: 0 0 0.8rem;
}

.rate-form {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.rate-form label {
  display: flex;
  flex-direction: column;
  font-size: 0.78rem;
  color: var(--text-muted);
  gap: 0.25rem;
  letter-spacing: 0.02em;
}

.rate-form select {
  font: inherit;
  padding: 0.4rem 0.5rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
}

.rate-form button {
  align-self: flex-end;
  padding: 0.5rem 1.2rem;
  border: none;
  border-radius: var(--radius);
  background: linear-gradient(135deg, var(--accent-start), var(--accent-end));
  color: #fff;
  font-weight: 600;
  letter-spacing: 0.02em;
  cursor: pointer;
}

.rate-form button:hover {
  filter: brightness(1.08);
}

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(21, 23, 28, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 1rem;
}

.modal-overlay[hidden] {
  display: none;
}

.modal-box {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 1.5rem;
  max-width: 360px;
  width: 100%;
}

.modal-box p {
  margin: 0 0 1rem;
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
}

.modal-cancel {
  padding: 0.5rem 1.1rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
}

.modal-ok {
  padding: 0.5rem 1.1rem;
  border: none;
  border-radius: var(--radius);
  background: linear-gradient(135deg, var(--accent-start), var(--accent-end));
  color: #fff;
  font-weight: 600;
  cursor: pointer;
}

@media (max-width: 600px) {
  body {
    padding: 1.5rem 1.1rem 3rem;
    font-size: 1.05rem;
  }

  header {
    margin-left: -1.1rem;
    margin-right: -1.1rem;
    padding: 0.85rem 1.1rem 0.85rem;
  }

  .header-top {
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 0.6rem;
  }

  .logo {
    font-size: 1.45rem;
  }

  .nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  nav {
    display: none;
    flex-basis: 100%;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.9rem;
    margin-top: 0.4rem;
    font-size: 0.95rem;
  }

  nav.nav-open {
    display: flex;
  }

  h1 {
    font-size: 1.2rem;
  }

  .ranking-list li {
    padding: 0.75rem 0 0.75rem 1.8rem;
  }

  .exhibition-card {
    padding: 1rem 1.1rem;
  }

  .rate-form {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }

  .rate-form button {
    align-self: stretch;
  }

  .search-form {
    flex-direction: column;
  }

  .modal-box {
    padding: 1.25rem;
  }
}