/* ============================================================
   Later Arcade — Global Design System
   Fonts: Syne (display) · DM Sans (body) · JetBrains Mono (data)
   ============================================================ */

/* ─── Reset ─── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    --font-display: 'Syne', 'Segoe UI', system-ui, sans-serif;
    --font-body: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Courier New', monospace;
    --bg-deep: #06060a;
    --bg-surface: #0c0c14;
    --bg-card: rgba(255,255,255,0.025);
    --border-subtle: rgba(255,255,255,0.06);
    --border-hover: rgba(255,255,255,0.14);
    --text-primary: #f0f0f5;
    --text-secondary: rgba(255,255,255,0.45);
    --text-muted: rgba(255,255,255,0.2);
    --accent: #8b5cf6;
    --accent-glow: rgba(139,92,246,0.25);
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: var(--font-body);
    background: var(--bg-deep);
    color: var(--text-primary);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

/* ─── Site Nav ─── */
.site-nav {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.6rem 2rem;
    background: rgba(6,6,10,0.85);
    border-bottom: 1px solid var(--border-subtle);
    backdrop-filter: blur(20px) saturate(1.4);
    -webkit-backdrop-filter: blur(20px) saturate(1.4);
    position: sticky;
    top: 0;
    z-index: 500;
}
.site-nav__brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-display);
    color: #fff;
    font-weight: 800;
    font-size: 1rem;
    letter-spacing: 3px;
    text-transform: uppercase;
    text-decoration: none;
    margin-right: auto;
    transition: color var(--transition);
}
.site-nav__brand:hover { color: var(--accent); }
.site-nav__brand-mark {
    display: inline-flex;
    width: 22px; height: 22px;
    align-items: center; justify-content: center;
    background: linear-gradient(135deg, var(--accent), #ec4899);
    border-radius: 6px;
    color: #fff;
    font-size: 0.7rem;
    box-shadow: 0 4px 12px var(--accent-glow);
}
.site-nav__right {
    display: flex;
    align-items: center;
    gap: 0.65rem;
}
.site-nav__user {
    color: var(--text-muted);
    font-size: 0.78rem;
    font-weight: 500;
    padding-right: 0.6rem;
    border-right: 1px solid var(--border-subtle);
}
.site-nav__action {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.82rem;
    font-weight: 500;
    padding: 0.4rem 0.85rem;
    border-radius: 8px;
    transition: all var(--transition);
}
.site-nav__action:hover {
    color: #fff;
    background: rgba(255,255,255,0.05);
}

/* ─── Lang Switch (custom dropdown) ─── */
.lang-switch {
    position: relative;
}
.lang-switch__btn {
    display: flex;
    align-items: center;
    gap: 0.45rem;
    background: rgba(255,255,255,0.04);
    border: 1px solid var(--border-subtle);
    color: var(--text-secondary);
    padding: 0.4rem 0.7rem 0.4rem 0.6rem;
    border-radius: 8px;
    font-family: var(--font-body);
    font-size: 0.78rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
}
.lang-switch__btn:hover {
    background: rgba(255,255,255,0.07);
    border-color: var(--border-hover);
    color: #fff;
}
.lang-switch__btn[aria-expanded="true"] {
    background: rgba(139,92,246,0.12);
    border-color: var(--accent);
    color: #fff;
}
.lang-switch__icon { width: 16px; height: 16px; opacity: 0.8; }
.lang-switch__chev { width: 10px; height: 7px; opacity: 0.6; transition: transform 0.2s; }
.lang-switch__btn[aria-expanded="true"] .lang-switch__chev { transform: rotate(180deg); }
.lang-switch__label { letter-spacing: 0.3px; }

.lang-switch__menu {
    position: absolute;
    top: calc(100% + 6px);
    right: 0;
    min-width: 180px;
    background: rgba(12, 12, 20, 0.96);
    border: 1px solid var(--border-hover);
    border-radius: 12px;
    padding: 0.4rem;
    box-shadow: 0 16px 48px rgba(0,0,0,0.5), 0 0 0 1px rgba(255,255,255,0.04);
    backdrop-filter: blur(24px) saturate(1.4);
    -webkit-backdrop-filter: blur(24px) saturate(1.4);
    display: flex;
    flex-direction: column;
    gap: 2px;
    z-index: 600;
    animation: langMenuIn 0.16s cubic-bezier(0.4, 0, 0.2, 1);
}
/* hidden 속성이 있으면 반드시 숨김 (display:flex가 UA [hidden]을 덮어쓰는 문제 수정) */
.lang-switch__menu[hidden] { display: none !important; }
@keyframes langMenuIn {
    from { opacity: 0; transform: translateY(-6px) scale(0.97); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}
.lang-switch__opt {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    text-align: left;
    width: 100%;
    padding: 0.5rem 0.7rem;
    border-radius: 8px;
    font-family: var(--font-body);
    font-size: 0.82rem;
    cursor: pointer;
    transition: background 0.12s, color 0.12s;
}
.lang-switch__opt:hover {
    background: rgba(255,255,255,0.05);
    color: #fff;
}
.lang-switch__opt--active {
    background: rgba(139,92,246,0.18);
    color: #fff;
}
.lang-switch__opt-code {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 1.5px;
    color: var(--accent);
    background: rgba(139,92,246,0.12);
    padding: 2px 8px;
    border-radius: 5px;
    min-width: 44px;
    text-align: center;
}
.lang-switch__opt-name { flex: 1; }
.lang-switch__opt-check { width: 14px; height: 14px; color: var(--accent); }

@media (max-width: 600px) {
    .site-nav { padding: 0.5rem 1rem; gap: 0.5rem; }
    .site-nav__brand { font-size: 0.85rem; letter-spacing: 2px; }
    .site-nav__user { display: none; }
    .lang-switch__label { display: none; }
    .lang-switch__btn { padding: 0.4rem 0.55rem; }
}

main {
    padding: 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
}

/* ─── Arcade Home: Layout ─── */
.home-layout {
    display: grid;
    grid-template-columns: 160px 1fr 160px;
    gap: 2rem;
    max-width: 1100px;
    margin: 0 auto;
}
.home-content { grid-column: 2; }

/* ─── Arcade Home: Header ─── */
.home-header {
    text-align: center;
    padding: 3rem 0 2.5rem;
    position: relative;
}
.home-header::before {
    content: '';
    position: absolute;
    top: 0; left: 50%;
    transform: translateX(-50%);
    width: 280px; height: 280px;
    background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
    pointer-events: none;
    opacity: 0.4;
}
.home-header h1 {
    font-family: var(--font-display);
    font-size: 2.8rem;
    font-weight: 800;
    color: #fff;
    letter-spacing: 6px;
    text-transform: uppercase;
    position: relative;
}
.home-header .home-subtitle {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-top: 0.6rem;
    font-weight: 400;
    letter-spacing: 3px;
    text-transform: uppercase;
}

/* ─── Game Grid ─── */
.game-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 1.25rem;
}

/* ─── Game Card ─── */
.game-card {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: 0;
    text-decoration: none;
    color: inherit;
    transition: all var(--transition);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    position: relative;
    animation: cardReveal 0.5s ease both;
}
.game-card:nth-child(1) { animation-delay: 0.05s; }
.game-card:nth-child(2) { animation-delay: 0.1s; }
.game-card:nth-child(3) { animation-delay: 0.15s; }
.game-card:nth-child(4) { animation-delay: 0.2s; }
.game-card:nth-child(5) { animation-delay: 0.25s; }
.game-card:nth-child(6) { animation-delay: 0.3s; }
.game-card:nth-child(7) { animation-delay: 0.35s; }
.game-card:nth-child(8) { animation-delay: 0.4s; }
.game-card:nth-child(9) { animation-delay: 0.45s; }
.game-card:nth-child(10) { animation-delay: 0.5s; }
.game-card:nth-child(11) { animation-delay: 0.55s; }
.game-card:nth-child(12) { animation-delay: 0.6s; }

@keyframes cardReveal {
    from { opacity: 0; transform: translateY(24px); }
    to   { opacity: 1; transform: translateY(0); }
}

.game-card:hover {
    border-color: var(--border-hover);
    background: rgba(255,255,255,0.045);
    transform: translateY(-4px);
    box-shadow: 0 16px 48px rgba(0,0,0,0.4), 0 0 0 1px var(--border-hover);
}

.game-card img {
    width: 100%;
    aspect-ratio: 16/10;
    object-fit: cover;
    display: block;
}
.game-card .card-body {
    padding: 1.2rem 1.4rem 1.4rem;
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}
.game-card h2 {
    font-family: var(--font-display);
    color: #fff;
    font-size: 1.05rem;
    font-weight: 700;
    letter-spacing: 0.5px;
}
.game-card p {
    color: var(--text-secondary);
    font-size: 0.78rem;
    line-height: 1.6;
}
.game-card .card-arrow {
    color: var(--text-muted);
    font-size: 0.75rem;
    margin-top: auto;
    padding-top: 0.5rem;
    transition: all var(--transition);
    font-weight: 500;
    letter-spacing: 1px;
}
.game-card:hover .card-arrow {
    color: var(--accent);
    letter-spacing: 3px;
}

.empty-msg {
    color: var(--text-muted);
    text-align: center;
    padding: 4rem;
    font-size: 0.9rem;
}

/* ─── Ad Slots (shared across all pages) ─── */
.ad-slot { display: flex; align-items: flex-start; justify-content: center; }
.ad-slot--left  { padding-top: 2rem; }
.ad-slot--right { padding-top: 2rem; }
.ad-slot--top, .ad-slot--bottom { display: none; }

.ad-placeholder {
    background: rgba(255,255,255,0.015);
    border: 1px dashed rgba(255,255,255,0.05);
    border-radius: var(--radius-sm);
    color: rgba(255,255,255,0.06);
    font-family: var(--font-mono);
    font-size: 0.6rem;
    font-weight: 600;
    letter-spacing: 4px;
    text-align: center;
    padding: 2rem 0.5rem;
    width: 100%;
}
.ad-placeholder--vertical {
    min-height: 500px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: sticky;
    top: 5rem;
}

/* ─── Game Detail Page ─── */
#game-container {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    min-height: 400px;
    margin: 1rem 0;
    padding: 1.5rem;
}

/* ─── Login Page ─── */
.login-card {
    max-width: 380px;
    margin: 4rem auto;
    padding: 2.5rem;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    text-align: center;
}
.login-card h1 {
    font-family: var(--font-display);
    font-size: 1.6rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 1.5rem;
    letter-spacing: 1px;
}
.login-card p { margin-top: 0.5rem; }
.login-card label {
    display: block;
    text-align: left;
    margin-bottom: 0.3rem;
    color: var(--text-secondary);
    font-size: 0.78rem;
    font-weight: 500;
}
.login-card input[type="text"],
.login-card input[type="password"] {
    width: 100%;
    padding: 0.65rem 0.9rem;
    background: rgba(255,255,255,0.04);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 0.9rem;
    margin-bottom: 0.8rem;
    transition: border-color var(--transition);
}
.login-card input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}
.login-card button[type="submit"] {
    width: 100%;
    padding: 0.75rem;
    background: var(--accent);
    border: none;
    border-radius: var(--radius-sm);
    color: #fff;
    font-family: var(--font-body);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    margin-top: 0.5rem;
}
.login-card button[type="submit"]:hover {
    background: #7c3aed;
    box-shadow: 0 4px 20px var(--accent-glow);
}
.login-card a {
    color: var(--text-secondary);
    font-size: 0.82rem;
    text-decoration: none;
    transition: color var(--transition);
}
.login-card a:hover { color: var(--accent); }
.login-card .helptext,
.login-card .errorlist {
    font-size: 0.72rem;
    color: var(--text-muted);
    text-align: left;
}
.login-card .errorlist { color: #ef4444; list-style: none; }

/* ─── Responsive ─── */
@media (max-width: 900px) {
    .home-layout {
        grid-template-columns: 1fr;
        max-width: 600px;
    }
    .home-content { grid-column: 1; }
    .home-layout > .ad-slot--left,
    .home-layout > .ad-slot--right { display: none; }
    .ad-slot--top, .ad-slot--bottom {
        display: flex;
        justify-content: center;
        padding: 0.75rem 0;
    }
    nav { padding: 0.6rem 1rem; }
    main { padding: 1rem; }
    .home-header h1 { font-size: 2rem; letter-spacing: 4px; }
}

@media (max-width: 480px) {
    .game-grid { grid-template-columns: 1fr; }
    main { padding: 0.5rem; }
    .home-header { padding: 2rem 0 1.5rem; }
    .home-header h1 { font-size: 1.6rem; letter-spacing: 2px; }
}