@import url('https://fonts.googleapis.com/css2?family=Oswald:wght@400;700&family=Noto+Sans+JP:wght@400;700&display=swap');

:root {
    --bg-color: #050505;
    --text-main: #f1f5f9;
    --text-muted: #a1a1aa;
    --text-dark: #71717a; /**/
    --primary-red: #dc2626;
    --primary-red-hover: #ef4444;
    --card-bg: #0c0a09;
    --border-color: #1c1917;
    --nav-bg: rgba(0, 0, 0, 0.95);
    --footer-bg: #000000;
}

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

body {
    font-family: 'Noto Sans JP', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
}

/* Text selection style */
::selection {
    background-color: var(--primary-red);
    color: white;
}

/* Font Helpers */
.oswald {
    font-family: 'Oswald', sans-serif;
}
.tekken-font {
    text-transform: uppercase;
    font-style: italic;
    letter-spacing: -0.05em;
}

a {
    text-decoration: none;
    color: inherit;
}

/* Navigation */
nav {
    position: sticky;
    top: 0;
    z-index: 50;
    background-color: var(--nav-bg);
    border-bottom: 1px solid rgba(127, 29, 29, 0.4);
    backdrop-filter: blur(4px);
}

.nav-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 16px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    font-size: 1.25rem;
    font-weight: bold;
    color: var(--primary-red);
    transition: color 0.3s;
    text-decoration: none;
}

.nav-logo:hover {
    color: var(--primary-red-hover);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 24px;
    font-size: 0.75rem;
    font-weight: bold;
}

.nav-links a {
    color: #64748b;
    text-decoration: none;
    transition: color 0.3s;
}

.nav-links a:hover {
    color: white;
}

.nav-links .active {
    color: var(--primary-red-hover);
}

.nav-links span {
    color: var(--primary-red-hover);
}

/* Animated Hero Background */
@keyframes hero-bg-anim {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.hero-section {
    position: relative;
    height: 180px;
    width: 100%;
    overflow: hidden;
    border-bottom: 1px solid #18181b;
    background: linear-gradient(-45deg, #000000, #220101, #0a000d, #000000);
    background-size: 400% 400%;
    animation: hero-bg-anim 15s ease infinite;
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.5);
}

.hero-content {
    position: relative;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 16px;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
}

.hero-title {
    font-size: 1.875rem;
    font-weight: 900;
    letter-spacing: -0.05em;
}

@media (min-width: 768px) {
    .hero-title { font-size: 3rem; }
}

.hero-subtitle {
    color: var(--text-muted);
    font-size: 10px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    margin-top: 8px;
}

/* Main Container */
main {
    flex-grow: 1;
    max-width: 768px; /* 3xl */
    margin: 0 auto;
    padding: 48px 16px;
    width: 100%;
}

/* Content Card Styles */
.info-card {
    border: 1px solid var(--border-color);
    background-color: var(--card-bg);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
    border-radius: 4px;
    padding: 24px;
    margin-bottom: 32px;
}

@media (min-width: 768px) {
    .info-card { padding: 32px; }
}

.red-accent-border {
    border-left: 4px solid var(--primary-red);
}

.card-title {
    font-size: 1.125rem;
    font-weight: bold;
    color: #f1f5f9;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 12px;
}
.card-title.red { color: var(--primary-red-hover); }
.card-title.zinc { color: #d4d4d8; }

.title-accent {
    width: 6px;
    height: 18px;
    display: inline-block;
}
.title-accent.red { background-color: var(--primary-red); }
.title-accent.zinc { background-color: #52525b; }

.card-text {
    font-size: 0.875rem;
    color: #d4d4d8;
    line-height: 1.8;
    margin-bottom: 16px;
}
.card-text:last-child { margin-bottom: 0; }
.card-text.muted { color: var(--text-muted); }

/* ↓ABOUTページ専用↓ */

.license-box {
    background-color: rgba(0, 0, 0, 0.4);
    padding: 16px;
    border: 1px solid #18181b;
    border-radius: 4px;
    font-size: 0.75rem;
    color: var(--text-dark);
    line-height: 1.625;
}
.license-title {
    font-weight: bold;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.disclaimer-list {
    font-size: 0.875rem;
    color: var(--text-muted);
    line-height: 1.625;
    list-style-type: disc;
    list-style-position: inside;
}
.disclaimer-list li { margin-bottom: 12px; }
.disclaimer-list li:last-child { margin-bottom: 0; }

.contact-box {
    display: flex;
    flex-direction: column;
    gap: 16px;
}
@media (min-width: 640px) {
    .contact-box { flex-direction: row; }
}

.sns-card {
    flex: 1;
    background-color: rgba(24, 24, 27, 0.5);
    border: 1px solid #18181b;
    padding: 16px;
    border-radius: 4px;
    text-align: center;
}
.sns-label {
    font-size: 10px;
    color: var(--text-dark);
    font-weight: bold;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 4px;
}
.sns-link {
    font-size: 0.875rem;
    color: #f87171;
    font-weight: bold;
    transition: color 0.3s;
}
.sns-link:hover { color: #fca5a5; }

/* ↑ABOUTページ専用↑ */

/* Button to go back */
.back-btn-container {
    text-align: center;
    margin-top: 20px;
}
.back-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 32px;
    background-color: rgba(69, 10, 10, 0.8);
    color: var(--primary-red);
    border: 1px solid rgba(127, 29, 29, 0.5);
    border-radius: 4px;
    font-weight: bold;
    font-family: 'Oswald', sans-serif;
    text-decoration: none;
    transition: all 0.3s;
}
.back-btn:hover {
    background-color: #7f1d1d;
    color: white;
    box-shadow: 0 0 15px rgba(239, 68, 68, 0.4);
}

/* Footer */
footer {
    border-top: 1px solid #09090b;
    background-color: var(--footer-bg);
    padding: 32px 0;
    margin-top: 20px;
}
.footer-content {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 16px;
    text-align: center;
}
.footer-text {
    color: #3f3f46;
    font-size: 9px;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    line-height: 1.625;
}