@import url("https://fonts.googleapis.com/css?family=Roboto&display=swap");
@import url("https://fonts.googleapis.com/css?family=M+PLUS+Rounded+1c:wght@400;700&display=swap");

:root {
  --font-family-base: "Roboto", sans-serif;
  --font-family-heading: "Kosugi Maru", sans-serif;
  --font-size-base: 16px;
  --color-bg: #f5f5f5;
  --color-text: #333;
  --color-heading-bg: #333;
  --color-heading-text: #f5f5f5;
  --color-primary: #007bff;
  --color-border: #ddd;
  --color-surface: #fff;
  --color-rank-first: #ffd700;
  --color-rank-second: #eeeeee;
  --color-rank-third: #cd7f32;
  --color-badge-daily: #2196f3;
  --color-badge-weekly: #4caf50;
  --color-badge-monthly: #ff9800;
  --color-badge-recommend: #f44336;
  --color-nogizaka46: #dbc5f4;
  --color-sakurazaka46: #e9c6d6;
  --color-hinatazaka46: #d9ecf6;
  --article-accent-width: 12px;
  --page-header-height: 4rem;
  --space-xxs: 2px;
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
}

body {
  font-family: var(--font-family-base);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  margin: 0;
  font-size: var(--font-size-base);
}

.page-header {
  position: sticky;
  top: 0;
  z-index: 1100;
  background: linear-gradient(135deg, #343045, #1f1b2e);
  color: var(--color-heading-text);
  padding-block: var(--space-sm);
}

.page-header__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
}

.page-header__title {
  font-family: var(--font-family-heading);
  font-weight: 700;
  font-size: 1.5rem;
  margin: 0;
}

@media (min-width: 768px) {
  .page-header {
    padding-block: var(--space-md);
  }

  .page-header__inner {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr) auto;
    align-items: center;
    gap: var(--space-md);
  }
}

@media (max-width: 600px) {
  .page-header__title {
    font-size: 1.125rem;
  }
}

.page-header__link {
  color: inherit;
  text-decoration: none;
}

.page-header__link:hover {
  text-decoration: underline;
}

.main-content {
  min-height: 60vh;
}
/* Common utility styles */

.category-official {
  background-color: #fff9db;
}

.hidden {
  display: none !important;
}
/* Article list container */

.articles {
  padding-block: var(--space-lg);
}

.articles__item {
  list-style: none;
}

/* Article card */

.article {
  position: relative;
  display: block;
  color: inherit;
  overflow: hidden;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.article::before {
  content: "";
  position: absolute;
  inset-block: 0;
  left: 0;
  width: var(--article-accent-width);
  background-color: transparent;
  pointer-events: none;
}

.article.card {
  border: 1px solid rgba(15, 23, 42, 0.08);
  border-radius: 1rem;
  background-color: var(--color-surface);
}

.article.card .card-body {
  padding: 1.25rem 1.5rem;
}

.article__header {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: start;
  gap: var(--space-sm);
}

.article:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 24px rgba(15, 23, 42, 0.12);
}

.article--nogizaka46::before {
  background-color: var(--color-nogizaka46);
}

.article--sakurazaka46::before {
  background-color: var(--color-sakurazaka46);
}

.article--hinatazaka46::before {
  background-color: var(--color-hinatazaka46);
}

.article__title {
  font-size: 1rem;
  line-height: 1.5;
  font-weight: 600;
  color: var(--color-text);
}

@media (min-width: 768px) {
  .article__title {
    font-size: 1.05rem;
  }
}

.article__info {
  gap: var(--space-sm);
}

.article__source {
  color: #495057;
  font-weight: 500;
}

.article__date {
  color: #868e96;
}

.article__rank {
  background-color: #6c757d;
  color: #fff;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.article__rank--first {
  background-color: var(--color-rank-first);
  color: #4d3b00;
}

.article__rank--second {
  background-color: var(--color-rank-second);
  color: #343a40;
}

.article__rank--third {
  background-color: var(--color-rank-third);
  color: #fff;
}

.article--viewed {
  opacity: 0.7;
}

.article--viewed .article__title {
  color: #6c757d;
}

.articles--hide-viewed .articles__item--viewed {
  display: none;
}

.article--highlight .article__title {
  color: #c41e3a;
}

.article__debug {
  margin-top: var(--space-xs);
}

.article__badge {
  font-size: 0.75rem;
  border: none;
}

.article__badge--daily {
  background-color: var(--color-badge-daily);
}

.article__badge--weekly {
  background-color: var(--color-badge-weekly);
}

.article__badge--monthly {
  background-color: var(--color-badge-monthly);
}

.article__badge--recommend {
  background-color: var(--color-badge-recommend);
}

.youtube-icon {
  display: inline-block;
  width: 14px;
  height: 14px;
  margin-right: 4px;
  background: url('data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHZpZXdCb3g9IjAgMCAyNCAyNCI+PHJlY3Qgd2lkdGg9IjI0IiBoZWlnaHQ9IjI0IiByeD0iNCIgcnk9IjQiIGZpbGw9IiNGRjAwMDAiLz48cG9seWdvbiBwb2ludHM9IjEwLDggMTYsMTIgMTAsMTYiIGZpbGw9IiNGRkZGRkYiLz48L3N2Zz4=') no-repeat center/contain;
}
/* Navigation and search */

.navigation-panel {
  margin-block: 1.5rem;
}

.navigation-panel__dialog {
  width: 100%;
}

.navigation-panel__header {
  display: none;
}

.navigation-panel__header[hidden] {
  display: none !important;
}

.navigation-panel__title {
  font-size: 1.25rem;
  font-weight: 700;
  color: #1f2937;
}

.navigation-panel__close {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border: 0;
  border-radius: 50%;
  background-color: #edf2f7;
  color: #1f2937;
  font-size: 1.125rem;
}

.navigation-panel__close:focus {
  outline: none;
  box-shadow: 0 0 0 2px rgba(90, 55, 140, 0.2);
}

.navigation-panel__close:focus-visible {
  outline: 2px solid #5a378c;
  outline-offset: 2px;
}

.navigation-form {
  position: sticky;
  top: var(--page-header-height);
  z-index: 1050;
  background-color: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(15, 23, 42, 0.08);
  padding-block: 0.75rem;
}

@supports not (backdrop-filter: blur(12px)) {
  .navigation-form {
    background-color: #f8f9fa;
  }
}

.navigation-form__label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #6c757d;
  margin-bottom: 0.5rem;
}

.navigation-form__segmented {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.navigation-form__segmented--nowrap {
  flex-wrap: nowrap;
  gap: 0.75rem;
}

.navigation-form__segmented--nowrap .navigation-form__chip {
  flex: 1 1 auto;
  white-space: nowrap;
}

.navigation-form__chip {
  border-radius: 999px;
  padding-inline: 1rem;
  font-weight: 600;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.navigation-form__chip:hover {
  transform: translateY(-1px);
}

.navigation-form__segmented .btn-check:checked + .navigation-form__chip {
  background: linear-gradient(135deg, #343045, #1f1b2e);
  border-color: transparent;
  color: #fff;
  box-shadow: 0 10px 18px rgba(15, 23, 42, 0.18);
}

.navigation-form__group-column,
.navigation-form__ordering-column {
  display: flex;
  flex-direction: column;
}

@media (min-width: 992px) {
  .navigation-form__ordering-column {
    min-width: 20rem;
  }
}

@media (min-width: 1200px) {
  .navigation-form__ordering-column {
    min-width: 22rem;
  }
}

@media (max-width: 600px) {
  .navigation-form {
    padding-inline: 1rem;
  }

  .navigation-form__segmented--nowrap {
    flex-wrap: wrap;
    gap: 0.5rem;
  }
}

.mobile-filter-backdrop {
  display: none;
}

@media (max-width: 767.98px) {
  body.mobile-filter-open {
    overflow: hidden;
  }

  .navigation-panel {
    position: fixed;
    inset-inline: 0;
    bottom: calc(env(safe-area-inset-bottom) + 5.75rem);
    z-index: 1100;
    display: none;
    padding-inline: 1rem;
    margin-block: 0;
    opacity: 0;
    transform: translateY(1.5rem);
    transition: opacity 0.3s ease, transform 0.3s ease;
  }

  .navigation-panel--visible {
    display: block;
    opacity: 1;
    transform: translateY(0);
  }

  .navigation-panel__dialog {
    background-color: #ffffff;
    border-radius: 1.25rem;
    box-shadow: 0 20px 40px rgba(15, 23, 42, 0.25);
    padding: 1.5rem 1.25rem;
    max-width: 640px;
    margin: 0 auto;
    max-height: calc(100vh - 7rem);
    overflow-y: auto;
  }

  .navigation-panel--visible .navigation-panel__header:not([hidden]) {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1rem;
  }

  .navigation-panel__title {
    font-size: 1rem;
  }

  .navigation-panel__close {
    width: 2rem;
    height: 2rem;
    font-size: 1rem;
  }

  .navigation-panel .container-xxl {
    padding: 0;
  }

  .navigation-form {
    position: static;
    background-color: transparent;
    backdrop-filter: none;
    border: 0;
    padding: 0;
    box-shadow: none;
  }

  .mobile-filter-backdrop {
    position: fixed;
    inset: 0;
    z-index: 1050;
    background: rgba(15, 23, 42, 0.4);
    opacity: 0;
    transition: opacity 0.3s ease;
  }

  .mobile-filter-backdrop--visible {
    display: block;
    opacity: 1;
  }
}
/* Pagination */

.pagination-nav {
  padding-block: var(--space-lg);
}

.pagination-nav .page-item {
  margin: 0;
}

.pagination-nav .page-link {
  border-radius: 999px;
  border: 1px solid rgba(15, 23, 42, 0.12);
  color: var(--color-text);
  min-width: 2.5rem;
  text-align: center;
  transition: all 0.2s ease;
}

.pagination-nav .page-link:hover {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}

.pagination-nav .page-item.active .page-link {
  background: linear-gradient(135deg, #343045, #1f1b2e);
  border-color: transparent;
  color: #fff;
  box-shadow: 0 10px 20px rgba(15, 23, 42, 0.18);
}

@media (max-width: 480px) {
  .pagination-nav .page-link {
    min-width: 2.25rem;
    padding-inline: 0.5rem;
  }
}