:root {
    --color-bg: #FFFFFF;
    --color-text: #333333;
    --color-text-light: #666666;
    --color-primary: #0066CC;
    --color-primary-hover: #004C99;
    --color-border: #EEEEEE;
    --color-bg-light: #F9F9F9;
    
    --font-family-sans: Helvetica, Arial, sans-serif;
    
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 48px;
    
    --container-width: 1200px;
}

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

body {
    font-family: var(--font-family-sans);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.7;
    font-size: 16px;
}

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

a:hover {
    text-decoration: underline;
    color: var(--color-primary-hover);
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Header */
header {
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-md) 0;
}

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

.logo {
    font-weight: bold;
    font-size: 1.5rem;
    color: var(--color-text);
    text-decoration: none;
}

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

.logo-image {
    display: inline-flex;
    align-items: center;
}

.logo-image img {
    display: block;
    height: 36px;
    width: auto;
}

nav ul {
    display: flex;
    gap: var(--spacing-lg);
    list-style: none;
    align-items: center;
}

nav a {
    color: var(--color-text);
    font-weight: 500;
}

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

.nav-search {
    margin-left: var(--spacing-sm);
}

.nav-search-form {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 10px;
    border: 1px solid var(--color-border);
    border-radius: 999px;
    background-color: var(--color-bg-light);
    transition: border-color 0.2s ease, background-color 0.2s ease;
}

.nav-search-button {
    border: none;
    background: transparent;
    padding: 0;
    margin: 0;
    color: var(--color-text-light);
    cursor: pointer;
    font-size: 1rem;
    line-height: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.nav-search-input {
    width: 0;
    opacity: 0;
    border: none;
    background: transparent;
    outline: none;
    font-size: 0.95rem;
    color: var(--color-text);
    transition: width 0.25s ease, opacity 0.2s ease;
}

.nav-search-input::placeholder {
    color: var(--color-text-light);
}

.nav-search-form:hover,
.nav-search-form:focus-within {
    border-color: #D9E6F5;
    background-color: #F4F8FF;
}

.nav-search-form:hover .nav-search-input,
.nav-search-form:focus-within .nav-search-input {
    width: 180px;
    opacity: 1;
}

.nav-search-button:hover,
.nav-search-form:focus-within .nav-search-button {
    color: var(--color-primary);
}

/* Footer */
footer {
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-xl) 0 var(--spacing-lg);
    margin-top: var(--spacing-xl);
    color: var(--color-text-light);
    font-size: 0.9rem;
}

.footer-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.footer-top {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--spacing-xl);
}

.footer-column h3 {
    font-size: 1rem;
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
}

.footer-column p {
    margin-bottom: var(--spacing-sm);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 6px;
}

.footer-bottom {
    border-top: 1px solid var(--color-border);
    padding-top: var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-md);
    font-size: 0.85rem;
    color: var(--color-text-light);
}

.footer-friend-links {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    align-items: center;
}

.friend-link-item {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.friend-link-item img {
    display: block;
    height: auto;
}

.footer-bottom a {
    color: var(--color-text-light);
}

.footer-bottom a:hover {
    color: var(--color-primary);
}

.footer-legal {
    display: flex;
    gap: var(--spacing-md);
}

/* Utilities */
.section-title {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid var(--color-border);
}

.section-subtitle {
    margin-left: var(--spacing-sm);
    color: var(--color-text-light);
    font-size: 0.95rem;
    font-weight: 500;
}

.section-header {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: var(--spacing-md);
}

.section-header-link {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--color-text-light);
    text-decoration: none;
    white-space: nowrap;
}

.section-header-link:hover {
    color: var(--color-primary);
    text-decoration: underline;
}

.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--color-primary);
    color: white;
    border-radius: 4px;
    font-weight: 500;
}

.btn:hover {
    background-color: var(--color-primary-hover);
    text-decoration: none;
    color: white;
}

.btn-outline {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 0;
    border: none;
    background: none;
    color: var(--color-text-light);
    font-weight: 500;
    font-size: 0.95rem;
    text-decoration: none;
    position: relative;
    transition: color 0.2s ease;
}

.btn-outline::after {
    content: "\2192";
    transition: transform 0.2s ease;
}

.btn-outline:hover {
    color: var(--color-primary-hover);
    text-decoration: none;
}

.btn-outline:hover::after {
    transform: translateX(3px);
}

.btn-outline:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 4px;
    border-radius: 4px;
}

/* Grid */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.popular-series {
    margin-top: var(--spacing-xl);
}

/* Card */
.card {
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: var(--spacing-md);
    transition: box-shadow 0.2s;
    position: relative;
    overflow: hidden;
    background-color: #FFFFFF;
    color: #FFFFFF;
}

.card:hover {
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}

.card-title {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-sm);
    position: relative;
    z-index: 2;
    color: #FFFFFF;
    text-shadow: 0 2px 6px rgba(0, 0, 0, 0.5);
}

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

.card-title a:hover {
    color: #FFFFFF;
    text-decoration: underline;
}

.card-title a:visited {
    color: #FFFFFF;
}

.card a,
.card a:visited {
    color: #FFFFFF;
}

.card-meta {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: var(--spacing-md);
    position: relative;
    z-index: 2;
    text-shadow: 0 2px 6px rgba(0, 0, 0, 0.5);
}

.card .btn-outline {
    position: relative;
    z-index: 2;
    color: #FFFFFF;
    text-shadow: 0 2px 6px rgba(0, 0, 0, 0.5);
}

.card-bg-wrapper {
    position: absolute;
    inset: 0;
    z-index: 1;
}

.card-bg {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.card-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.60);
}

/* Hero */
.hero {
    text-align: center;
    padding: 80px 0;
    background-color: var(--color-bg-light);
    margin-bottom: var(--spacing-xl);
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-lg);
}

.search-box {
    margin-bottom: var(--spacing-lg);
}

.search-input {
    padding: 12px 20px;
    width: 100%;
    max-width: 500px;
    border: 1px solid var(--color-border);
    border-radius: 24px;
    font-size: 1rem;
}

/* Breadcrumb */
.breadcrumb {
    padding: var(--spacing-md) 0;
    color: var(--color-text-light);
    font-size: 0.9rem;
}

.breadcrumb a {
    color: var(--color-text-light);
}

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

/* Tables */
table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: var(--spacing-lg);
}

th, td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid var(--color-border);
}

.platforms-cell {
    max-width: 200px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

th {
    font-weight: 600;
    color: var(--color-text-light);
    background-color: var(--color-bg-light);
}

/* Alphabet Nav */
.alphabet-nav {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-md);
    background-color: var(--color-bg-light);
    border-radius: 8px;
}

.alphabet-nav a {
    padding: 4px 8px;
    font-weight: 600;
}

/* Detail Page Specifics */
.detail-header {
    margin-bottom: var(--spacing-xl);
}

.detail-header h1 {
    margin-bottom: var(--spacing-sm);
}

.play-order-section {
    margin-bottom: var(--spacing-xl);
}

.series-hero-image {
    margin-bottom: var(--spacing-lg);
    border-radius: 12px;
    overflow: hidden;
    max-height: 380px;
    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.08);
}

.series-hero-image img {
    display: block;
    width: 100%;
    height: auto;
}

.policy-content {
    max-width: 900px;
    padding-bottom: var(--spacing-xl);
}

.policy-section {
    margin-bottom: var(--spacing-xl);
}

.policy-section h3 {
    font-size: 1.05rem;
    margin: var(--spacing-md) 0 var(--spacing-sm);
    color: var(--color-text);
}

.policy-list {
    padding-left: 1.25rem;
    margin: var(--spacing-sm) 0 var(--spacing-md);
}

.policy-list li {
    margin-bottom: 6px;
}

.start-here {
    background-color: #F0F7FF;
    border: 1px solid #CCE4FF;
    padding: var(--spacing-lg);
    border-radius: 8px;
    margin-bottom: var(--spacing-xl);
}

.start-here h3 {
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
}

.start-here h3,
.game-guide h3,
.play-order-section h3 {
    margin: 8px 0;
}

.game-guide p + p {
    margin-top: 8px;
}

.start-here ul {
    list-style-position: inside;
}

.start-here li {
    margin-bottom: var(--spacing-sm);
}

.game-guide-item {
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
}

.game-guide-item:last-child {
    border-bottom: none;
}

.series-disclaimer {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-md);
    background-color: var(--color-bg-light);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    color: var(--color-text-light);
    font-size: 0.95rem;
}

.series-disclaimer p {
    margin: 0;
}

.layout-sidebar {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: var(--spacing-xl);
}

.sidebar-recommendations {
    background-color: var(--color-bg-light);
    padding: var(--spacing-md);
    border-radius: 8px;
}

.sidebar-title {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-sm);
}

.recommendation-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-sm);
}

.recommendation-card {
    display: flex;
    flex-direction: column;
    gap: 6px;
    text-decoration: none;
    color: var(--color-text);
}

.recommendation-card:hover .recommendation-title {
    color: var(--color-primary);
    text-decoration: underline;
}

.recommendation-thumb {
    width: 100%;
    aspect-ratio: 16 / 9;
    border-radius: 8px;
    overflow: hidden;
    background-color: #EDEDED;
}

.recommendation-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.recommendation-title {
    font-size: 0.9rem;
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.back-to-top {
    position: fixed;
    right: 24px;
    bottom: 24px;
    width: 52px;
    height: 52px;
    border-radius: 50%;
    border: 1px solid #D9E6F5;
    background-color: #F4F8FF;
    color: var(--color-primary);
    font-weight: 700;
    font-size: 0.75rem;
    letter-spacing: 0.5px;
    cursor: pointer;
    box-shadow: 0 8px 18px rgba(0, 0, 0, 0.1);
    opacity: 0;
    pointer-events: none;
    transform: translateY(8px);
    transition: opacity 0.2s ease, transform 0.2s ease, background-color 0.2s ease, color 0.2s ease;
    z-index: 50;
}

.back-to-top.is-visible {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
}

.back-to-top:hover {
    background-color: var(--color-primary);
    color: #FFFFFF;
}

.not-found {
    padding: var(--spacing-xl) 0;
    display: flex;
    justify-content: center;
}

.not-found-card {
    max-width: 720px;
    width: 100%;
    text-align: center;
    padding: var(--spacing-xl);
    background-color: var(--color-bg-light);
    border: 1px solid var(--color-border);
    border-radius: 12px;
}

.not-found-code {
    font-size: 3.5rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.not-found-title {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
}

.not-found-text {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-lg);
}

.not-found-search {
    margin-bottom: var(--spacing-lg);
}

.not-found-actions {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

@media (max-width: 768px) {
    .layout-sidebar {
        grid-template-columns: 1fr;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .section-header {
        align-items: flex-start;
        flex-direction: column;
    }

    .footer-top {
        grid-template-columns: 1fr;
    }

    .footer-bottom {
        flex-direction: column;
        align-items: flex-start;
    }

    .footer-friend-links {
        justify-content: flex-start;
    }
}