@font-face {
  font-family: "Alliance No.1";
  src: url("../assets/fonts/AllianceNo1-Regular.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "Alliance No.1";
  src: url("../assets/fonts/AllianceNo1-Medium.woff2") format("woff2");
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "Alliance No.1";
  src: url("../assets/fonts/AllianceNo1-SemiBold.woff2") format("woff2");
  font-weight: 600;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "Alliance No.1";
  src: url("../assets/fonts/AllianceNo1-Bold.woff2") format("woff2");
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}

:root {
  --bg: #f6f8fa;
  --card-bg: #ffffff;
  --border: #d0d7de;
  --text: #1f2328;
  --text-muted: #656d76;
  --link: #0969da;
  --focus-ring: rgba(9, 105, 218, 0.15);
  --radius: 6px;
  color-scheme: light;
}

:root[data-theme="dark"] {
  --bg: #0d1117;
  --card-bg: #161b22;
  --border: #30363d;
  --text: #e6edf3;
  --text-muted: #8b949e;
  --link: #4493f8;
  --focus-ring: rgba(68, 147, 248, 0.25);
  color-scheme: dark;
}

:root[data-theme="dark"] .header {
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
}

:root[data-theme="dark"] .card-image:hover {
  box-shadow: 0 3px 12px rgba(0, 0, 0, 0.5);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  overflow-y: scroll;
}

body {
  font-family: "Alliance No.1", -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 17px;
  line-height: 1.5;
}

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

a:hover {
  text-decoration: underline;
}

.container {
  max-width: 1600px;
  margin: 0 auto;
  padding: 0 24px;
}

@media (max-width: 640px) {
  .container {
    padding: 0 8px;
  }
}

/* Header */
.header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 2px 8px rgba(31, 35, 40, 0.06);
  margin-bottom: 32px;
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 16px;
  padding-top: 16px;
  padding-bottom: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 20px;
  font-weight: 600;
  color: var(--text);
}

.brand:hover {
  text-decoration: none;
}

.brand-mark {
  display: block;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  object-fit: cover;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-left: 8px;
  font-size: 15px;
}

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

.header-links {
  display: flex;
  align-items: center;
  gap: 24px;
  margin-left: auto;
  font-size: 15px;
}

.header-links a {
  color: var(--text);
}

.download-original {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  color: var(--text-muted);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: color 0.15s ease, border-color 0.15s ease;
}

.header-links a.download-original {
  color: var(--text-muted);
}

.download-original:hover {
  color: var(--link);
  border-color: var(--link);
  text-decoration: none;
}

.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  margin-left: auto;
  padding: 10px 9px;
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  color: var(--text-muted);
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.theme-toggle:hover {
  color: var(--link);
  border-color: var(--link);
}

.theme-toggle .icon-sun {
  display: none;
}

:root[data-theme="dark"] .theme-toggle .icon-sun {
  display: block;
}

:root[data-theme="dark"] .theme-toggle .icon-moon {
  display: none;
}

.menu-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--text);
  border-radius: 1px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

@media (max-width: 768px) {
  .menu-toggle {
    display: flex;
  }

  .menu-open .menu-toggle span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .menu-open .menu-toggle span:nth-child(2) {
    opacity: 0;
  }

  .menu-open .menu-toggle span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  .header-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    margin: 0;
    padding: 4px 24px;
    background: var(--card-bg);
    border-bottom: 1px solid var(--border);
    box-shadow: 0 8px 16px rgba(31, 35, 40, 0.1);
  }

  .menu-open .header-links {
    display: flex;
  }

  .header-links a {
    padding: 12px 0;
  }

  .header-links a + a {
    border-top: 1px solid var(--border);
  }

  .header-links a.download-original {
    color: var(--text);
    border: 0;
    border-radius: 0;
  }
}

/* Grid */
.grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  padding-bottom: 32px;
}

@media (max-width: 1024px) {
  .grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 768px) {
  .grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .grid {
    grid-template-columns: 1fr;
  }

  .search-control {
    flex-basis: 100%;
    max-width: none;
  }
}

/* Toolbar */
.toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 24px;
}

.search-control {
  flex: 1 1 240px;
  max-width: 320px;
}

.search-control input[type="search"] {
  width: 100%;
  font-family: inherit;
  font-size: 15px;
  color: var(--text);
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 8px 12px;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.search-control input[type="search"]::placeholder {
  color: var(--text-muted);
}

.search-control input[type="search"]:hover {
  border-color: var(--text-muted);
}

.search-control input[type="search"]:focus {
  outline: none;
  border-color: var(--link);
  box-shadow: 0 0 0 3px var(--focus-ring);
}

.page-size-control {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 15px;
  color: var(--text-muted);
}

.page-size-select {
  position: relative;
}

.page-size-trigger {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: inherit;
  font-size: 15px;
  color: var(--text);
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 6px 10px;
  cursor: pointer;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.page-size-trigger:hover {
  border-color: var(--text-muted);
}

.page-size-trigger:focus-visible {
  outline: none;
  border-color: var(--link);
  box-shadow: 0 0 0 3px var(--focus-ring);
}

.page-size-arrow {
  color: var(--text-muted);
  transition: transform 0.18s ease;
}

.page-size-select.open .page-size-arrow {
  transform: rotate(180deg);
}

.page-size-menu {
  position: absolute;
  top: calc(100% + 4px);
  right: 0;
  min-width: 100%;
  margin: 0;
  padding: 4px;
  list-style: none;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 4px 16px rgba(31, 35, 40, 0.12);
  z-index: 20;
}

.page-size-menu[hidden] {
  display: none;
}

.page-size-menu li {
  padding: 6px 10px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 15px;
  color: var(--text);
}

.page-size-menu li:hover,
.page-size-menu li:focus {
  outline: none;
  background: var(--focus-ring);
}

.page-size-menu li[aria-selected="true"] {
  color: var(--link);
  font-weight: 600;
}

/* Pagination */
.pagination {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding-bottom: 48px;
}

.pagination:empty {
  display: none;
}

.page-link,
.page-current,
.page-disabled,
.page-ellipsis {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 40px;
  padding: 0 12px;
  border-radius: var(--radius);
  font-size: 15px;
}

.page-link {
  color: var(--text);
  background: var(--card-bg);
  border: 1px solid var(--border);
  transition: box-shadow 0.15s ease, border-color 0.15s ease;
}

.page-link:hover {
  text-decoration: none;
  border-color: var(--text-muted);
  box-shadow: 0 2px 8px rgba(31, 35, 40, 0.08);
}

.page-current {
  color: #fff;
  background: var(--link);
  border: 1px solid var(--link);
  font-weight: 600;
}

.page-disabled {
  color: var(--text-muted);
  background: var(--card-bg);
  border: 1px solid var(--border);
  opacity: 0.5;
}

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

/* Card */
.card-image {
  display: block;
  padding: 8px;
  margin-bottom: 12px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: box-shadow 0.15s ease, transform 0.15s ease;
}

.card-image:hover {
  box-shadow: 0 3px 12px rgba(31, 35, 40, 0.15);
  transform: translateY(-2px);
}

.card-image img {
  display: block;
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: calc(var(--radius) - 2px);
}

.card-info {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.card-title {
  font-size: 19px;
  font-weight: 600;
}

.card-title a {
  color: var(--text);
}

.card-number {
  color: var(--text-muted);
  font-weight: 400;
  padding-right: 4px;
}

.card-authors {
  display: flex;
  flex-wrap: nowrap;
  gap: 4px;
}

.card-authors img {
  display: block;
  border-radius: 4px;
}

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

.card-download {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  color: var(--text-muted);
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: color 0.15s ease, border-color 0.15s ease;
}

.card-download:hover {
  color: var(--link);
  border-color: var(--link);
}

/* Detail page */
.back-link {
  font-size: 15px;
  margin-left: auto;
  color: var(--text-muted);
}

.detail-container {
  display: flex;
  justify-content: center;
  padding-bottom: 48px;
}

.card-detail {
  width: 100%;
  max-width: 640px;
}

.card-detail .card-image:hover {
  transform: none;
}

.card-detail .card-title {
  font-size: 26px;
}

/* FAQ */
.faq {
  max-width: 760px;
  padding-bottom: 64px;
}

.faq-title {
  font-size: 44px;
  font-weight: 700;
  margin-bottom: 8px;
}

.faq-subtitle {
  font-size: 18px;
  color: var(--text-muted);
  margin-bottom: 48px;
}

.faq-item {
  margin-bottom: 40px;
}

.faq-item h2 {
  font-size: 22px;
  font-weight: 600;
  margin-bottom: 8px;
}

.faq-item hr {
  border: 0;
  border-top: 1px solid var(--border);
  margin-bottom: 16px;
}

.faq-item p {
  margin-bottom: 12px;
}

.faq-item ul {
  padding-left: 24px;
}

.faq-item li {
  margin-bottom: 6px;
}

/* Ranking */
.ranking {
  max-width: 760px;
  padding-bottom: 64px;
}

.ranking-title {
  font-size: 44px;
  font-weight: 700;
  margin-bottom: 8px;
}

.ranking-subtitle {
  font-size: 18px;
  color: var(--text-muted);
  margin-bottom: 48px;
}

.ranking-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.ranking-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 20px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.ranking-position {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-muted);
  min-width: 24px;
  text-align: right;
}

.ranking-item--gold .ranking-position   { color: #bf8700; }
.ranking-item--silver .ranking-position { color: #57606a; }
.ranking-item--bronze .ranking-position { color: #953800; }

:root[data-theme="dark"] .ranking-item--gold .ranking-position   { color: #d29922; }
:root[data-theme="dark"] .ranking-item--silver .ranking-position { color: #b1bac4; }
:root[data-theme="dark"] .ranking-item--bronze .ranking-position { color: #db6d28; }

.ranking-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
}

.ranking-name {
  flex: 1;
  font-size: 17px;
  font-weight: 600;
  color: var(--text);
}

.ranking-count {
  font-size: 15px;
  color: var(--text-muted);
  white-space: nowrap;
}

/* Empty state */
.empty {
  padding: 48px 0;
  text-align: center;
  color: var(--text-muted);
}

/* Footer */
.footer {
  color: var(--text-muted);
  font-size: 15px;
}

.footer .container {
  border-top: 1px solid var(--border);
  padding-top: 24px;
  padding-bottom: 24px;
}

@media (max-width: 768px) {
  .footer {
    text-align: center;
  }
}

@media (max-width: 640px) {
  .header-links {
    padding: 4px 8px;
  }
}