:root {
  --primary-color: #18b394;
  --primary-hover-color: #1abd9d;
  --secondary-color: #34495e;
  --light-color: #f0f3f4;
  --dark-color: #1a1d21;
  --card-background: rgba(var(--card-bg-rgb), 0.9);
  --content-background: #282c34;
  --text-color: #bdc3c7;
  --subtle-text-color: #95a5a6;
  --border-color: rgba(236, 240, 241, 0.1);
  --shadow-color: rgba(0, 0, 0, 0.2);
  --shadow-hover-color: rgba(0, 0, 0, 0.3);
  --surface-color: #3a4149;
  --hover-background-color: rgba(var(--primary-rgb), 0.1);
  --hover-text-color: var(--primary-color);

  --border-radius: 8px;
  --transition-speed: 0.3s;
  --transition-speed-fast: 0.2s;
  --box-shadow: 0 4px 12px var(--shadow-color);
  --hover-shadow: 0 7px 20px var(--shadow-hover-color);

  --secondary-rgb: 52, 73, 94;
  --primary-rgb: 24, 179, 148;
  --dark-rgb: 26, 29, 33;
  --card-bg-rgb: 40, 44, 52;
  --content-bg-rgb: 40, 44, 52;
}

body.light-theme {
  --primary-color: #4a90e2;
  --primary-hover-color: #357abd;
  --secondary-color: #fdfdfd;
  --light-color: #2c3e50;
  --dark-color: #ffffff;
  --card-background: #ffffff;
  --content-background: #ffffff;
  --text-color: #495057;
  --subtle-text-color: #6c757d;
  --border-color: #dee2e6;
  --shadow-color: rgba(0, 0, 0, 0.05);
  --shadow-hover-color: rgba(0, 0, 0, 0.12);
  --surface-color: #f8f9fa;
  --hover-background-color: #e9ecef;
  --hover-text-color: var(--primary-hover-color);

  --primary-rgb: 74, 144, 226;
  --secondary-rgb: 253, 253, 253;
  --dark-rgb: 255, 255, 255;
  --card-bg-rgb: 255, 255, 255;
  --content-bg-rgb: 255, 255, 255;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: "Noto Sans KR", -apple-system, BlinkMacSystemFont, "Segoe UI",
    Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.75;
  background-color: var(--dark-color);
  color: var(--text-color);
  transition: background-color var(--transition-speed) ease,
    color var(--transition-speed) ease;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

main {
  flex-grow: 1;
  padding-top: 0;
}

a {
  text-decoration: none;
  color: var(--primary-color);
  transition: color var(--transition-speed-fast) ease-out;
}

a:hover,
a:focus {
  color: var(--primary-hover-color);
  text-decoration: none;
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 2px solid rgba(var(--primary-rgb), 0.5);
  outline-offset: 2px;
  border-radius: 4px;
}

ul {
  list-style: none;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: calc(var(--border-radius) / 2);
}

::-webkit-scrollbar {
  width: 10px;
}

::-webkit-scrollbar-track {
  background: rgba(var(--secondary-rgb), 0.1);
  transition: background var(--transition-speed-fast) ease-out;
}

::-webkit-scrollbar-thumb {
  background-color: rgba(var(--primary-rgb), 0.5);
  border-radius: 10px;
  border: 2px solid transparent;
  background-clip: padding-box;
  transition: background-color var(--transition-speed-fast) ease-out;
}

::-webkit-scrollbar-thumb:hover {
  background-color: rgba(var(--primary-rgb), 0.7);
}

.container {
  max-width: 1280px;
  width: 90%;
  margin-inline: auto;
}

header {
  background-color: rgba(var(--dark-rgb), 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  color: var(--light-color);
  padding: 1rem 0;
  box-shadow: none;
  position: sticky;
  top: 0;
  z-index: 1000;
  transition: background-color var(--transition-speed-fast) ease-out,
    border-color var(--transition-speed) ease,
    color var(--transition-speed) ease, top var(--transition-speed) ease-in-out;
  border-bottom: 1px solid var(--border-color);
}

body.light-theme header {
  background-color: rgba(var(--dark-rgb), 0.9);
  border-bottom-color: var(--border-color);
  color: var(--light-color);
}

header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

header h1 a {
  color: var(--light-color);
  font-size: 1.5rem;
  font-weight: 500;
  letter-spacing: 0.5px;
  text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.05);
  transition: color var(--transition-speed) ease;
}

header h1 a.site-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--light-color);
  font-size: 1.5rem;
  font-weight: 500;
  text-decoration: none;
}

header h1 a.site-logo img {
  height: 40px;
  width: auto;
}

body.light-theme header h1 a {
  color: var(--light-color);
}

header nav {
  display: flex;
  align-items: center;
}

header nav ul {
  display: flex;
  gap: 1.8rem;
  margin-inline-end: 1.5rem;
}

header nav ul li a {
  color: var(--light-color);
  padding: 0.5rem 0.2rem;
  padding-bottom: 0.3rem;
  font-size: 0.95rem;
  font-weight: 400;
  transition: color var(--transition-speed) ease,
    background-color var(--transition-speed-fast) ease-out;
  border-radius: 0;
  position: relative;
  display: inline-block;
  text-decoration: none;
  background-color: transparent;
}

body.light-theme header nav ul li a {
  color: var(--light-color);
}

header nav ul li a::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background-color: var(--primary-color);
  transition: width var(--transition-speed-fast) ease-out;
}

header nav ul li a:hover::after,
header nav ul li a:focus::after {
  width: 60%;
}

header nav ul li a:hover,
header nav ul li a:focus {
  color: var(--primary-color);
  background-color: transparent;
}

body.light-theme header nav ul li a:hover,
body.light-theme header nav ul li a:focus {
  color: var(--primary-color);
}

header nav ul li.dropdown {
  position: relative;
}

header nav ul li.dropdown .dropdown-toggle .caret {
  display: inline-block;
  margin-inline-start: 4px;
  font-size: 0.8em;
  transition: transform var(--transition-speed-fast) ease-in-out;
}

header nav ul li.dropdown .dropdown-menu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  background-color: var(--content-background);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: 8px 0;
  margin: 2px 0 0;
  list-style: none;
  min-width: 160px;
  z-index: 1001;
  box-shadow: var(--box-shadow);
  opacity: 0;
  visibility: hidden;
  transform: translateY(5px);
  transition: opacity var(--transition-speed-fast) ease,
    visibility var(--transition-speed-fast) ease,
    transform var(--transition-speed-fast) ease;
}

header nav ul li.dropdown:hover .dropdown-menu,
header nav ul li.dropdown:focus-within .dropdown-menu {
  display: block;
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

header nav ul li.dropdown:hover .dropdown-toggle .caret {
  transform: rotate(180deg);
}

header nav ul li.dropdown .dropdown-menu li {
  margin: 0;
  padding: 0;
}

header nav ul li.dropdown .dropdown-menu li a {
  display: block;
  padding: 8px 16px;
  color: var(--text-color);
  text-decoration: none;
  white-space: nowrap;
  transition: background-color var(--transition-speed-fast) ease,
    color var(--transition-speed-fast) ease;
}

header nav ul li.dropdown .dropdown-menu li a:hover {
  background-color: var(--hover-background-color);
  color: var(--hover-text-color);
}

#theme-toggle-button {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--subtle-text-color);
  padding: 0.5rem;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  transition: background-color var(--transition-speed) ease,
    color var(--transition-speed-fast) ease-out,
    border-color var(--transition-speed) ease,
    transform var(--transition-speed-fast) ease,
    box-shadow var(--transition-speed) ease;
}

#theme-toggle-button:hover {
  background-color: rgba(var(--primary-rgb), 0.1);
  color: var(--primary-color);
  border-color: rgba(var(--primary-rgb), 0.2);
  box-shadow: 0 0 8px rgba(var(--primary-rgb), 0.1);
}

#theme-toggle-button:active {
  transform: scale(0.95);
}

#theme-toggle-button svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

.icon-sun,
.icon-moon {
  display: none;
}

body:not(.light-theme) .icon-moon {
  display: block;
}

body.light-theme .icon-sun {
  display: block;
}

.sub-header {
  background-color: var(--content-background);
  padding: 2rem 0;
  border-bottom: 1px solid var(--border-color);
  text-align: center;
  margin-top: 0;
}

.sub-header h1 {
  font-size: 2.2rem;
  margin-bottom: 0.5rem;
  color: var(--light-color);
  font-weight: 600;
  letter-spacing: 0.5px;
}

body.light-theme .sub-header h1 {
  color: var(--light-color);
}

.sub-header .lead {
  font-size: 1.1rem;
  line-height: 1.7;
  color: var(--subtle-text-color);
  max-width: 750px;
  margin: 0 auto;
}

.hero {
  display: none;
}

.cta-button,
.play-now-button,
.btn,
.view-more-button,
.back-link,
.not-found-container a.btn {
  display: inline-block;
  padding: 0.8rem 2rem;
  border-radius: var(--border-radius);
  font-size: 1rem;
  font-weight: 500;
  transition: transform var(--transition-speed-fast) ease,
    box-shadow var(--transition-speed) ease,
    background-color var(--transition-speed) ease,
    color var(--transition-speed) ease,
    border-color var(--transition-speed) ease;
  border: none;
  cursor: pointer;
  text-align: center;
}

.cta-button,
.play-now-button,
.btn,
.view-more-button,
.not-found-container a.btn {
  background-color: var(--primary-color);
  color: #fff;
  box-shadow: 0 3px 8px rgba(var(--primary-rgb), 0.15);
}

.cta-button:hover,
.cta-button:focus,
.play-now-button:hover,
.play-now-button:focus,
.btn:hover,
.btn:focus,
.view-more-button:hover,
.view-more-button:focus,
.not-found-container a.btn:hover,
.not-found-container a.btn:focus {
  transform: translateY(-2px);
  box-shadow: 0 5px 15px rgba(var(--primary-rgb), 0.25);
  background-color: var(--primary-hover-color);
  color: #fff;
  text-decoration: none;
}

.view-more-button {
  padding: 10px 20px;
  border-radius: calc(var(--border-radius) / 1.5);
  font-size: 0.9rem;
}

.back-link {
  padding: 0.6rem 1.5rem;
  border: 1px solid var(--border-color);
  color: var(--subtle-text-color);
  font-size: 0.9rem;
  background-color: transparent;
}

.back-link:hover {
  transform: translateY(-2px);
  background-color: var(--hover-background-color);
  color: var(--hover-text-color);
  border-color: rgba(var(--primary-rgb), 0.2);
  text-decoration: none;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

body.light-theme .back-link:hover {
  color: var(--hover-text-color);
}

.not-found-container a.btn {
  padding: 0.8rem 1.8rem;
  font-size: 0.95rem;
  box-shadow: 0 3px 8px rgba(var(--primary-rgb), 0.2);
}

.not-found-container a.btn:hover,
.not-found-container a.btn:focus {
  box-shadow: 0 5px 15px rgba(var(--primary-rgb), 0.3);
}

.btn-lg {
  padding: 1rem 2.5rem;
  font-size: 1.15rem;
}

.app-section {
  padding: 3.5rem 0;
}

.app-section h2 {
  text-align: center;
  margin-bottom: 3rem;
  font-size: 2rem;
  color: var(--light-color);
  font-weight: 500;
  position: relative;
  padding-bottom: 0.8rem;
  transition: color var(--transition-speed) ease;
  letter-spacing: 0px;
}

body.light-theme .app-section h2 {
  color: var(--light-color);
}

.app-section h2::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 50px;
  height: 4px;
  background: var(--primary-color);
  border-radius: 2px;
  transition: background var(--transition-speed) ease;
}

.app-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}

.app-card,
.app-card-horizontal {
  background-color: var(--card-background);
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--box-shadow);
  transition: transform var(--transition-speed-fast) ease,
    box-shadow var(--transition-speed) ease,
    background-color var(--transition-speed) ease,
    border-color var(--transition-speed) ease;
  border: 1px solid var(--border-color);
  position: relative;
}

.app-card::before,
.app-card-horizontal::before {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: var(--border-radius);
  padding: 1.5px;
  background: linear-gradient(
    135deg,
    rgba(var(--primary-rgb), 0.4),
    rgba(var(--primary-rgb), 0.1)
  );
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: destination-out;
  mask-composite: exclude;
  transition: opacity var(--transition-speed) ease;
  pointer-events: none;
  z-index: 0;
}

.app-card:hover,
.app-card-horizontal:hover {
  transform: translateY(-5px);
  box-shadow: var(--hover-shadow);
}

.app-card:hover::before,
.app-card-horizontal:hover::before {
  opacity: 1;
}

body.light-theme .app-card,
body.light-theme .app-card-horizontal {
  background-color: var(--card-background);
  box-shadow: var(--box-shadow);
}

body.light-theme .app-card:hover,
body.light-theme .app-card-horizontal:hover {
  box-shadow: var(--hover-shadow);
}

.app-card {
  display: flex;
  flex-direction: column;
}

.app-card a {
  color: inherit;
  text-decoration: none;
}

.app-card .card-thumbnail {
  display: block;
  overflow: hidden;
}

.app-card .card-thumbnail img {
  width: 100%;
  height: 160px;
  object-fit: cover;
  opacity: 1;
  transition: opacity var(--transition-speed) ease,
    transform var(--transition-speed) ease, filter var(--transition-speed) ease;
  border-radius: 0;
  border-top-left-radius: calc(var(--border-radius) - 1px);
  border-top-right-radius: calc(var(--border-radius) - 1px);
  border-bottom: 1px solid var(--border-color);
}

.app-card:hover .card-thumbnail img {
  transform: scale(1.04);
  filter: brightness(1.08);
}

.app-card .card-thumbnail img.is-placeholder {
  object-fit: contain;
  opacity: 0.6;
}

.app-card .card-content {
  padding: 1.2rem;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.app-card .card-title {
  margin-bottom: 0.5rem;
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--light-color);
  line-height: 1.4;
  transition: color var(--transition-speed) ease-out;
  letter-spacing: 0.1px;
}

body.light-theme .app-card .card-title {
  color: var(--light-color);
}

.app-card .card-title a {
  text-decoration: none;
  color: inherit;
}

.app-card:hover .card-title a {
  color: var(--primary-color);
}

.app-card .card-description {
  font-size: 0.85rem;
  color: var(--subtle-text-color);
  margin-bottom: 1rem;
  line-height: 1.6;
  transition: color var(--transition-speed) ease-out;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex-grow: 1;
}

.app-card .card-tags {
  margin-top: auto;
  padding-top: 0.5rem;
}

.tag {
  display: inline-block;
  background-color: rgba(var(--secondary-rgb), 0.12);
  color: var(--subtle-text-color);
  padding: 4px 8px;
  border-radius: 4px;
  font-size: 0.7rem;
  font-weight: 400;
  margin-inline-end: 6px;
  margin-bottom: 6px;
  border: 1px solid transparent;
  transition: background-color var(--transition-speed) ease,
    color var(--transition-speed-fast) ease-out,
    transform var(--transition-speed-fast) ease;
}

.tag:hover {
  background-color: rgba(var(--primary-rgb), 0.1);
  color: var(--primary-color);
  transform: translateY(-1px);
}

body.light-theme .tag:hover {
  color: var(--primary-hover-color);
}

.view-more-container {
  text-align: center;
  margin-top: 2rem;
}

footer {
  background-color: var(--dark-color);
  color: var(--subtle-text-color);
  text-align: center;
  padding: 2.5rem 0;
  margin-top: 5rem;
  border-top: 1px solid var(--border-color);
  font-size: 0.9rem;
  transition: background-color var(--transition-speed) ease,
    color var(--transition-speed) ease,
    border-color var(--transition-speed) ease;
}

body.light-theme footer {
  background-color: var(--secondary-color);
}

.app-detail-container {
  padding-top: 3rem;
  padding-bottom: 4rem;
}

.app-header {
  margin-bottom: 2.5rem;
  text-align: center;
}

.app-title {
  font-size: 2.2rem;
  margin-bottom: 0.8rem;
  text-align: center;
  color: var(--light-color);
  font-weight: 600;
  transition: color var(--transition-speed) ease;
  letter-spacing: 0.3px;
}

body.light-theme .app-title {
  color: var(--light-color);
}

.app-header .app-description {
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--subtle-text-color);
  max-width: 750px;
  margin-inline: auto;
  margin-top: 0.5rem;
}

.app-detail-columns {
  gap: 2.5rem;
  align-items: flex-start;
  display: flex;
  flex-wrap: wrap;
  margin-top: 0;
  margin-bottom: 2.5rem;
}

.app-detail-column-player {
  flex: 2;
  min-width: 300px;
  position: relative;
}

.app-detail-column-content {
  flex: 1;
  min-width: 280px;
}

.app-detail-column-player .app-player {
  box-shadow: var(--box-shadow);
  position: relative;
  width: 100%;
  padding-bottom: 56.25%;
  height: 0;
  overflow-y: auto;
  background-color: #000;
  border-radius: var(--border-radius);
  border: 1px solid var(--border-color);
  transition: box-shadow var(--transition-speed) ease,
    border-color var(--transition-speed) ease;
}

.app-player iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
}

.app-content {
  padding: 1.8rem;
  background-color: var(--content-background);
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
  margin-bottom: 0;
  border: 1px solid var(--border-color);
  transition: background-color var(--transition-speed) ease,
    box-shadow var(--transition-speed) ease,
    border-color var(--transition-speed) ease;
}

.app-content h2,
.app-content h3 {
  font-size: 1.25rem;
  margin-bottom: 1rem;
  padding-bottom: 0.6rem;
  color: var(--light-color);
  font-weight: 500;
  border-bottom: 1px solid var(--border-color);
  transition: color var(--transition-speed) ease,
    border-color var(--transition-speed) ease;
  letter-spacing: 0.1px;
}

body.light-theme .app-content h2,
body.light-theme .app-content h3 {
  color: var(--light-color);
}

.app-content p,
.app-content ul,
.app-content ol {
  font-size: 0.9rem;
  line-height: 1.7;
  margin-bottom: 1rem;
  color: var(--text-color);
  transition: color var(--transition-speed) ease;
}

.app-content ul,
.app-content ol {
  padding-inline-start: 20px;
}

.app-content ul {
  list-style: none;
}

.app-content ol {
  list-style: decimal;
}

.app-content ul li {
  position: relative;
  padding-inline-start: 20px;
  margin-bottom: 0.6rem;
}

.app-content ul li::before {
  content: "—";
  position: absolute;
  left: 0;
  top: 2px;
  color: var(--primary-color);
  font-size: 1.1em;
  transition: color var(--transition-speed) ease;
  font-weight: bold;
}

.back-link-container {
  text-align: center;
  margin-top: 2.5rem;
}

.screenshots {
  margin-top: 2.5rem;
}

.screenshots h3 {
  font-size: 1.5rem;
  color: var(--light-color);
  font-weight: 600;
  margin-bottom: 1.5rem;
  text-align: center;
}

body.light-theme .screenshots h3 {
  color: var(--light-color);
}

.screenshots-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
}

.screenshots-grid img {
  border-radius: calc(var(--border-radius) / 1.5);
  box-shadow: 0 3px 8px var(--shadow-color);
  cursor: pointer;
  transition: transform var(--transition-speed) ease-out,
    box-shadow var(--transition-speed) ease, filter var(--transition-speed) ease;
  border-color: var(--transition-speed) ease;
  border: 1px solid var(--border-color);
}

.screenshots-grid img:hover {
  transform: scale(1.03);
  box-shadow: 0 6px 15px var(--shadow-hover-color);
  filter: brightness(1.1);
}

body.light-theme .screenshots-grid img:hover {
  filter: brightness(1.02);
}

.related-apps {
  margin-top: 3.5rem;
}

.related-apps h3 {
  text-align: center;
  margin-bottom: 2.5rem;
  font-size: 1.8rem;
  color: var(--light-color);
  font-weight: 600;
  position: relative;
  padding-bottom: 1rem;
  transition: color var(--transition-speed) ease;
}

body.light-theme .related-apps h3 {
  color: var(--light-color);
}

.related-apps h3::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 50px;
  height: 3px;
  background: var(--primary-color);
  border-radius: 3px;
  transition: background var(--transition-speed) ease;
}

.related-apps .app-grid {
  margin-top: 2.5rem;
}

.not-found-container {
  margin: 5rem auto;
  max-width: 550px;
  text-align: center;
  padding: 2.5rem;
  background-color: var(--content-background);
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
  border: 1px solid var(--border-color);
  transition: background-color var(--transition-speed) ease,
    box-shadow var(--transition-speed) ease,
    border-color var(--transition-speed) ease;
}

.not-found-container h1 {
  margin: 0 0 1rem 0;
  font-size: 5em;
  line-height: 1;
  letter-spacing: -1px;
  color: var(--primary-color);
  transition: color var(--transition-speed) ease;
  font-weight: 700;
}

.not-found-container p {
  margin-bottom: 1.5rem;
  font-size: 1rem;
  color: var(--text-color);
  transition: color var(--transition-speed) ease-out;
}

.not-found-container p strong {
  font-weight: 600;
  color: var(--light-color);
}

body.light-theme .not-found-container p strong {
  color: var(--light-color);
}

.recommended-section {
  background-color: var(--surface-color);
  border-radius: var(--border-radius);
  padding-top: 3rem;
  padding-bottom: 3rem;
  margin-bottom: 4rem;
  box-shadow: var(--box-shadow);
  border: 1px solid var(--border-color);
  transition: background-color var(--transition-speed) ease,
    border-color var(--transition-speed) ease,
    box-shadow var(--transition-speed) ease;
  position: relative;
  overflow: hidden;
}

.recommended-section.has-bg {
  background-image: var(--recommended-bg-image);
  background-size: cover;
  background-position: center;
  padding: 4rem 1.5rem;
  min-height: 350px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.recommended-section.has-bg-overlay::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    rgba(var(--dark-rgb), 0.6),
    rgba(var(--dark-rgb), 0.8)
  );
  z-index: 1;
}

body.light-theme .recommended-section.has-bg-overlay::before {
  background: linear-gradient(
    rgba(var(--dark-rgb), 0.5),
    rgba(var(--dark-rgb), 0.7)
  );
}

.recommended-content-wrapper {
  position: relative;
  z-index: 2;
  text-align: center;
}

.recommended-section h2 {
  margin-bottom: 2.5rem;
  color: var(--light-color);
  letter-spacing: -0.5px;
  text-align: center;
}

body.light-theme .recommended-section h2 {
  color: var(--light-color);
}

.recommended-app-container {
  display: flex;
  justify-content: center;
}

.recommended-app-card {
  display: flex;
  flex-wrap: wrap;
  background-color: var(--card-background);
  border-radius: var(--border-radius);
  overflow: hidden;
  max-width: 800px;
  width: 100%;
  box-shadow: var(--hover-shadow);
  border: 1px solid var(--border-color);
  transition: background-color var(--transition-speed) ease,
    border-color var(--transition-speed) ease;
}

.recommended-thumbnail {
  flex: 1 1 300px;
  min-height: 250px;
}

.recommended-thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 0;
  border-inline-end: 1px solid var(--border-color);
  transition: border-color var(--transition-speed) ease;
}

.recommended-content {
  flex: 2 1 400px;
  padding: 2rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.recommended-badge {
  display: inline-block;
  background-color: rgba(var(--primary-rgb), 0.15);
  color: var(--primary-color);
  padding: 0.3rem 0.8rem;
  border-radius: calc(var(--border-radius) / 2);
  font-size: 0.8rem;
  font-weight: 500;
  margin-bottom: 1rem;
}

.recommended-title {
  font-size: 1.8rem;
  margin-bottom: 1rem;
  color: var(--light-color);
}

body.light-theme .recommended-title {
  color: var(--light-color);
}

.recommended-title a {
  text-decoration: none;
  color: inherit;
}

.recommended-title a:hover {
  color: var(--primary-hover-color);
}

.recommended-description {
  font-size: 1rem;
  color: var(--text-color);
  margin-bottom: 1.5rem;
  line-height: 1.6;
  max-width: 600px;
  margin-inline: auto;
}

.recommended-actions {
  margin-top: auto;
  padding-top: 1rem;
}

.recommended-tags {
  display: inline-block;
  vertical-align: middle;
}

.recommended-app-container > p {
  color: var(--subtle-text-color);
  padding: 2rem 0;
  text-align: center;
}

.recommended-section-empty p {
  color: var(--subtle-text-color);
  font-style: italic;
}

.player-controls {
  display: flex;
  justify-content: flex-end;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.control-button {
  background-color: rgba(var(--secondary-rgb), 0.2);
  border: 1px solid var(--border-color);
  color: var(--subtle-text-color);
  padding: 0.4rem;
  border-radius: 6px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  transition: background-color var(--transition-speed-fast) ease,
    color var(--transition-speed-fast) ease,
    border-color var(--transition-speed-fast) ease;
}

.control-button:hover {
  background-color: rgba(var(--primary-rgb), 0.1);
  color: var(--primary-color);
  border-color: rgba(var(--primary-rgb), 0.3);
}

.control-button svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
}

.app-player.wide-mode {
  padding-bottom: 75%;
}

.text-center {
  text-align: center;
}

.mb-3 {
  margin-bottom: 1rem;
}

.mb-4 {
  margin-bottom: 1.5rem;
}

.mb-5 {
  margin-bottom: 3rem;
}

.p-4 {
  padding: 1.5rem;
}

.p-md-5 {
  padding: 3rem;
}

.border {
  border: 1px solid var(--border-color);
}

.rounded {
  border-radius: var(--border-radius);
}

.h-100 {
  height: 100%;
}

.text-primary {
  color: var(--primary-color) !important;
}

.text-muted {
  color: var(--subtle-text-color) !important;
}

.bg-light {
  background-color: var(--surface-color) !important;
}

.lead {
  font-size: 1.25rem;
  font-weight: 300;
  color: var(--subtle-text-color);
}

.row {
  display: flex;
  flex-wrap: wrap;
  margin-right: -15px;
  margin-left: -15px;
}

.col-md-4 {
  position: relative;
  width: 100%;
  padding-right: 15px;
  padding-left: 15px;
  flex: 0 0 100%;
  max-width: 100%;
}

.page-container {
  padding-top: 3rem;
  padding-bottom: 4rem;
}

.page-container h1 {
  text-align: center;
  margin-bottom: 3rem;
  font-size: 2.2rem;
  color: var(--light-color);
  font-weight: 600;
  transition: color var(--transition-speed) ease;
  letter-spacing: 0.3px;
}

body.light-theme .page-container h1 {
  color: var(--light-color);
}

.page-container .app-section {
  padding: 0;
}

.page-container .app-section h2 {
  display: none;
}

.page-content {
  padding-top: 3rem;
  padding-bottom: 4rem;
}

.page-content h1 {
  font-size: 2.5rem;
  color: var(--light-color);
  margin-bottom: 1rem;
  font-weight: 600;
  text-align: center;
}

body.light-theme .page-content h1 {
  color: var(--light-color);
}

.page-content h2 {
  font-size: 1.8rem;
  color: var(--light-color);
  margin-top: 2.5rem;
  margin-bottom: 1.5rem;
  padding-bottom: 0.8rem;
  border-bottom: 1px solid var(--border-color);
  font-weight: 600;
  text-align: center;
  max-width: 600px;
  margin-inline: auto;
}

body.light-theme .page-content h2 {
  color: var(--light-color);
}

.page-content h2::after {
  display: none;
}

.page-content p,
.page-content ul,
.page-content ol {
  font-size: 1rem;
  line-height: 1.8;
  margin-bottom: 1.2rem;
  color: var(--text-color);
  width: 100%;
  max-width: 800px;
  margin-inline: auto;
}

.page-content ul,
.page-content ol {
  padding-inline-start: 0;
  display: inline-block;
  text-align: left;
}

.page-content ul li {
  position: relative;
  padding-inline-start: 25px;
  margin-bottom: 0.8rem;
}

.page-content ul li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 1px;
  color: var(--primary-color);
  font-size: 1.1em;
  font-weight: 600;
}

.about-page .page-header {
  margin-bottom: 3rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-color);
  text-align: center;
}

.about-page .page-header h1 {
  margin-bottom: 0.5rem;
}

.about-page .page-header .lead {
  margin-inline: auto;
}

.about-section {
  margin-bottom: 3rem;
  text-align: center;
}

.about-page .about-section p {
  margin-inline: auto;
  text-align: center;
}

.about-page .about-section h2 {
  text-align: center;
  margin-inline: auto;
}

.features-section .row {
  gap: 1.5rem 0;
  justify-content: center;
}

.feature-item {
  background-color: var(--content-background);
  transition: background-color var(--transition-speed) ease,
    transform var(--transition-speed-fast) ease,
    box-shadow var(--transition-speed) ease;
  text-align: center;
  padding: 1.5rem;
  border-radius: var(--border-radius);
  border: 1px solid var(--border-color);
}

.feature-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--hover-shadow);
}

.feature-item i {
  font-size: 2rem;
  display: block;
  margin-bottom: 1rem;
  color: var(--primary-color);
}

.feature-item h3 {
  font-size: 1.25rem;
  color: var(--light-color);
  margin-bottom: 0.8rem;
  font-weight: 600;
  text-align: center;
}

body.light-theme .feature-item h3 {
  color: var(--light-color);
}

.feature-item p {
  font-size: 0.9rem;
  margin-bottom: 0;
  text-align: center;
  color: var(--subtle-text-color);
}

.call-to-action {
  border: 1px solid var(--border-color);
  text-align: center;
  padding: 2rem;
  border-radius: var(--border-radius);
  background-color: var(--content-background);
}

.call-to-action h2 {
  border-bottom: none;
  margin-bottom: 1rem;
  margin-top: 0;
  font-size: 1.6rem;
  text-align: center;
}

.call-to-action p {
  margin-bottom: 1.5rem;
  margin-inline: auto;
  text-align: center;
}

.app-orientation-vertical .app-detail-vertical-layout {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}

.app-orientation-vertical .app-player-wrapper {
  width: 100%;
  max-width: 400px;
  position: relative;
}

.app-orientation-vertical .app-player {
  position: relative;
  width: 100%;
  padding-bottom: 177.78%;
  height: 0;
  overflow: auto;
  background-color: #000;
  border-radius: calc(var(--border-radius) - 2px);
  border: 1px solid var(--border-color);
}

.app-orientation-vertical .app-content {
  width: 100%;
  max-width: 700px;
}

.app-orientation-vertical .player-controls {
  position: static;
  margin-bottom: 0.5rem;
  justify-content: flex-end;
}

.app-card-horizontal {
  display: flex;
  align-items: center;
  margin-bottom: 1.5rem;
  max-width: 800px;
  margin-inline: auto;
}

.app-card-thumbnail {
  flex: 0 0 100px;
  overflow: hidden;
  position: relative;
  align-self: stretch;
}

.app-card-thumbnail a {
  display: block;
  height: 100%;
}

.app-card-thumbnail img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 0;
  transition: transform var(--transition-speed-fast) ease,
    filter var(--transition-speed-fast) ease;
}

.app-card-horizontal:hover .app-card-thumbnail img {
  transform: scale(1.03);
  filter: brightness(1.05);
}

.app-card-content {
  flex: 1;
  padding: 1rem 1.2rem;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  overflow: hidden;
}

.app-card-title {
  margin-top: 0;
  margin-bottom: 0.4rem;
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--light-color);
  line-height: 1.4;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

body.light-theme .app-card-title {
  color: var(--light-color);
}

.app-card-title a {
  text-decoration: none;
  color: inherit;
  transition: color var(--transition-speed-fast) ease-out;
}

.app-card-title a:hover {
  color: var(--primary-color);
}

.app-card-description {
  margin-bottom: 0.8rem;
  font-size: 0.8rem;
  color: var(--subtle-text-color);
  line-height: 1.5;
  flex-grow: 1;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  text-overflow: ellipsis;
  text-align: left;
}

.app-card-tags {
  margin-top: auto;
  padding-top: 0.4rem;
}

.app-card-tags .tag {
  background-color: rgba(var(--secondary-rgb), 0.15);
  color: var(--subtle-text-color);
  padding: 3px 7px;
  border-radius: 4px;
  font-size: 0.65rem;
  font-weight: 400;
  margin-inline-end: 5px;
  margin-bottom: 5px;
  border: none;
  display: inline-block;
  transition: background-color var(--transition-speed-fast) ease,
    color var(--transition-speed-fast) ease,
    transform var(--transition-speed-fast) ease;
}

.app-card-tags .tag:hover {
  background-color: rgba(var(--primary-rgb), 0.15);
  color: var(--primary-color);
  transform: translateY(-1px);
}

.categories-list {
  margin-top: 0;
}

.app-player.app-player--expanded {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 1001;
  padding-bottom: 0 !important;
  border-radius: 0;
  border: none;
  background-color: var(--dark-color);
  overflow-y: auto;
}

.app-player.app-player--expanded .player-controls {
  position: absolute;
  top: 15px;
  right: 15px;
  z-index: 1002;
  background-color: rgba(0, 0, 0, 0.6);
  padding: 8px;
  border-radius: var(--border-radius);
}

body.player-expanded .app-detail-column-content,
body.player-expanded .back-link-container,
body.player-expanded header:not(.header-fixed) {
  display: none;
}

body.player-expanded {
  overflow: hidden;
}

header nav ul li a.active {
  font-weight: bold;
  text-decoration: underline;
}

.no-favorites-message {
  margin-top: 20px;
  margin-bottom: 1.25rem;
  color: var(--subtle-text-color);
  text-align: center;
}

.favorite-toggle-btn {
  background-color: transparent;
  border: 1px solid var(--border-color);
  color: var(--subtle-text-color);
  padding: 0.4rem 0.8rem;
  cursor: pointer;
  border-radius: var(--border-radius);
  font-size: 1.1rem;
  line-height: 1;
  margin-inline-start: 0.5rem;
  vertical-align: middle;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: color var(--transition-speed-fast) ease,
    border-color var(--transition-speed-fast) ease,
    background-color var(--transition-speed-fast) ease,
    transform var(--transition-speed-fast) ease;
}

.favorite-toggle-btn:hover {
  color: var(--primary-color);
  border-color: var(--primary-color);
  background-color: rgba(var(--primary-rgb), 0.05);
}

.favorite-toggle-btn:active {
  transform: scale(0.95);
  background-color: rgba(var(--primary-rgb), 0.1);
}

.favorite-toggle-btn.is-favorite {
  background-color: rgba(var(--primary-rgb), 0.1);
  border-color: var(--primary-color);
  color: var(--primary-color);
}

.favorite-toggle-btn.is-favorite:hover {
  background-color: rgba(var(--primary-rgb), 0.2);
  border-color: var(--primary-hover-color);
  color: var(--primary-hover-color);
}

.favorite-toggle-btn.is-favorite:active {
  transform: scale(0.95);
  background-color: rgba(var(--primary-rgb), 0.3);
}

.favorite-toggle-btn svg {
  width: 1em;
  height: 1em;
  fill: currentColor;
}

@media (min-width: 768px) {
  .col-md-4 {
    flex: 0 0 33.333333%;
    max-width: 33.333333%;
  }

  .p-md-5 {
    padding: 3rem;
  }
}

@media (max-width: 992px) {
  .container {
    width: 90%;
  }

  .app-grid {
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.8rem;
  }

  .hero h2 {
    font-size: 2.5rem;
  }

  .hero p {
    font-size: 1.15rem;
  }

  .app-title {
    font-size: 2.2rem;
  }

  .app-section h2 {
    font-size: 2rem;
    margin-bottom: 2.5rem;
  }

  .page-content h1,
  .page-container h1 {
    font-size: 2.2rem;
  }

  .page-content h2 {
    font-size: 1.6rem;
  }
}

@media (max-width: 768px) {
  main {
    padding-top: 0;
  }

  header {
    padding: 0.5rem 0;
    position: sticky;
  }

  header .container {
    flex-direction: column;
    align-items: center;
    padding-bottom: 0.5rem;
    width: 100%;
    padding: 0 1rem;
  }

  header h1 {
    margin-bottom: 0.5rem;
    text-align: center;
  }

  header h1 a {
    font-size: 1.2rem;
  }

  header nav {
    flex-direction: column;
    align-items: center;
    width: 100%;
  }

  header nav ul {
    margin-inline-end: 0;
    margin-bottom: 0.5rem;
    flex-wrap: wrap;
    justify-content: center;
    padding-inline-start: 0;
    gap: 0.5rem 1rem;
  }

  header nav ul li a {
    font-size: 0.85rem;
    padding: 0.4rem 0.1rem;
  }

  #theme-toggle-button {
    margin-top: 0.5rem;
    width: 32px;
    height: 32px;
    padding: 0.4rem;
  }

  #theme-toggle-button svg {
    width: 16px;
    height: 16px;
  }

  .sub-header {
    padding: 1.5rem 0;
  }

  .sub-header h1 {
    font-size: 1.8rem;
  }

  .sub-header .lead {
    font-size: 1rem;
  }

  .app-detail-container,
  .page-content,
  .page-container {
    padding-top: 2rem;
  }

  .hero {
    padding: 4rem 0;
  }

  .hero h2 {
    font-size: 2rem;
  }

  .hero p {
    font-size: 1rem;
  }

  .app-grid {
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.5rem;
  }

  .app-title {
    font-size: 1.8rem;
  }

  .app-content {
    padding: 1.5rem;
  }

  .app-content h2,
  .app-content h3 {
    font-size: 1.2rem;
  }

  .related-apps h3 {
    font-size: 1.6rem;
  }

  .app-detail-columns {
    flex-direction: column;
    gap: 2rem;
    margin-bottom: 2rem;
  }

  .app-detail-column-player,
  .app-detail-column-content {
    flex: 1 1 100%;
    min-width: unset;
    width: 100%;
  }

  .app-orientation-horizontal .app-player {
    padding-bottom: 56.25%;
    overflow: auto;
  }

  .app-orientation-horizontal .player-controls {
    position: static;
    margin-bottom: 0.5rem;
    justify-content: flex-end;
  }

  .app-header {
    margin-bottom: 2rem;
  }

  .recommended-app-card {
    flex-direction: column;
  }

  .recommended-thumbnail img {
    border-inline-end: none;
    border-bottom: 1px solid var(--border-color);
  }

  .recommended-content {
    padding: 1.5rem;
  }

  .recommended-title {
    font-size: 1.5rem;
  }

  .recommended-description {
    font-size: 1rem;
  }

  .recommended-actions {
    margin-top: 1rem;
  }

  .play-now-button {
    display: block;
    margin-inline-end: 0;
    margin-bottom: 1rem;
    font-size: 1rem;
    padding: 0.8rem 1.5rem;
  }

  .btn-lg {
    padding: 0.9rem 2rem;
    font-size: 1.05rem;
  }

  .recommended-tags {
    display: block;
    text-align: center;
  }

  .page-content h1,
  .page-container h1 {
    font-size: 2rem;
  }

  .page-content h2 {
    font-size: 1.5rem;
  }

  .page-content p,
  .page-content ul,
  .page-content ol {
    font-size: 0.95rem;
  }

  .lead {
    font-size: 1.1rem;
  }

  .p-md-5 {
    padding: 1.5rem;
  }

  .app-orientation-vertical .app-player-wrapper {
    max-width: 90%;
  }

  .app-card-horizontal {
    margin-bottom: 1.2rem;
    max-width: none;
  }

  .app-card-thumbnail {
    flex-basis: 90px;
    margin-inline-end: 1rem;
  }

  .app-card-content {
    padding: 0.8rem 1rem 0.8rem 0;
  }

  .app-card-title {
    font-size: 1rem;
    margin-bottom: 0.3rem;
  }

  .app-card-description {
    font-size: 0.8rem;
    line-height: 1.4;
    margin-bottom: 0.6rem;
  }

  .app-card-tags .tag {
    padding: 2px 6px;
    font-size: 0.6rem;
    margin-inline-end: 4px;
    margin-bottom: 4px;
  }
}

@media (max-width: 480px) {
  html {
    font-size: 15px;
  }

  body {
    line-height: 1.6;
  }

  main {
    padding-top: 0;
  }

  .sub-header h1 {
    font-size: 1.6rem;
  }

  .sub-header .lead {
    font-size: 0.9rem;
  }

  .container {
    width: 92%;
  }

  header {
    padding: 0.3rem 0;
  }

  header h1 a {
    font-size: 1.1rem;
  }

  header nav ul {
    gap: 0.3rem 0.5rem;
  }

  header nav ul li a {
    padding: 6px 3px;
    font-size: 0.8rem;
  }

  .hero {
    padding: 3rem 0;
    margin-bottom: 3rem;
  }

  .hero h2 {
    font-size: 1.8rem;
  }

  .hero p {
    font-size: 0.9rem;
  }

  .cta-button,
  .play-now-button,
  .btn,
  .view-more-button {
    padding: 0.8rem 1.8rem;
    font-size: 0.95rem;
  }

  .btn-lg {
    padding: 0.9rem 2rem;
    font-size: 1rem;
  }

  .app-section {
    padding: 3rem 0;
  }

  .app-section h2 {
    font-size: 1.8rem;
    margin-bottom: 2rem;
  }

  .app-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .app-card .card-content {
    padding: 1rem;
  }

  .app-card .card-title {
    font-size: 1.1rem;
  }

  .app-card .card-description {
    font-size: 0.85rem;
  }

  .app-title {
    font-size: 1.6rem;
  }

  .app-content {
    padding: 1.2rem;
  }

  .app-content h2,
  .app-content h3 {
    font-size: 1.1rem;
  }

  .app-content p,
  .app-content ul,
  .app-content ol {
    font-size: 0.88rem;
  }

  .related-apps h3 {
    font-size: 1.5rem;
  }

  .screenshots-grid {
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 0.8rem;
  }

  .not-found-container h1 {
    font-size: 4em;
  }

  .not-found-container p {
    font-size: 0.95rem;
  }

  .control-button {
    width: 30px;
    height: 30px;
    padding: 0.35rem;
  }

  .control-button svg {
    width: 16px;
    height: 16px;
  }

  .page-content h1,
  .page-container h1 {
    font-size: 1.8rem;
  }

  .page-content h2 {
    font-size: 1.4rem;
  }

  .page-content p,
  .page-content ul,
  .page-content ol {
    font-size: 0.9rem;
  }

  .lead {
    font-size: 1rem;
  }

  .app-card-thumbnail {
    flex-basis: 75px;
    margin-inline-end: 0.8rem;
  }

  .app-card-content {
    padding: 0.6rem 0.8rem 0.6rem 0;
  }

  .app-card-title {
    font-size: 0.95rem;
  }

  .app-card-description {
    font-size: 0.75rem;
    -webkit-line-clamp: 1;
  }

  .app-card-tags .tag {
    padding: 2px 5px;
    font-size: 0.55rem;
  }
}

.coupang-banner-container-single {
  display: flex;
  justify-content: center; /* 가로 중앙 정렬 */
  align-items: center; /* 세로 중앙 정렬 */
  padding: 20px 10px; /* 컨테이너 내부 여백 (상하, 좌우) */
  margin: 30px auto; /* 다른 콘텐츠와의 상하 간격 및 자동 좌우 중앙 정렬 */
  /* max-width: 728px; */ /* 데스크톱에서 최대 너비 제한 (선택 사항) */
}

/* 쿠팡 배너 스크립트에 의해 생성된 요소(iframe 등) 스타일 */
.coupang-banner-container-single > iframe,
.coupang-banner-container-single > script + ins {
  /* 쿠팡 스크립트는 종종 <ins> 태그를 생성 */
  display: block !important;
  margin: 0 auto !important; /* 내부 요소도 가운데 정렬 */
  max-width: 100%; /* 부모 요소 너비를 넘지 않도록 (반응형 대응) */
}

@media (max-width: 768px) {
  .coupang-banner-container-single {
    /* max-width: 320px; */ /* 모바일에서 최대 너비 제한 (선택 사항) */
    padding: 15px 5px;
    margin: 20px auto;
  }
}