/* --- Global Styles & Resets --- */
:root {
    --bg-color: #0a0a0a;
    --card-bg: #121212;
    --item-bg: #181818;
    --border-color: #222222;
    
    --accent-v4: #00ff9d;
    --accent-v6: #00e5ff;
    
    --text-primary: #e5e5e5;
    --text-secondary: #777777;
    --text-hint: #444444;
    --shadow-color: rgba(0, 0, 0, 0.8);
}

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

body {
    font-family: "SF Mono", "Menlo", "Monaco", "Consolas", "monospace";
    background-color: var(--bg-color);
    color: var(--text-primary);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

/* --- Main Card Layout --- */
.card {
    background-color: var(--card-bg);
    border-radius: 16px;
    box-shadow: 0 20px 50px var(--shadow-color);
    width: 100%;
    max-width: 800px;
    padding: 40px;
    border: 1px solid var(--border-color);
}

h1 {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 35px;
    text-transform: uppercase;
    letter-spacing: 4px;
    text-align: center;
}

/* --- Dual Stack Layout --- */
.dual-stack-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 25px;
    margin-bottom: 25px;
}

.stack-box {
    background-color: var(--item-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 30px 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    transition: border-color 0.3s ease;
}

.stack-box:hover {
    border-color: #333;
}

/* --- Badges & Displays --- */
.version-badge {
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    padding: 4px 10px;
    border-radius: 20px;
    margin-bottom: 20px;
    background-color: rgba(255, 255, 255, 0.03);
}
.version-badge.v4 { color: var(--accent-v4); border: 1px solid rgba(0, 255, 157, 0.2); }
.version-badge.v6 { color: var(--accent-v6); border: 1px solid rgba(0, 229, 255, 0.2); }

.ip-display {
    font-size: 1.8rem;
    font-weight: 700;
    word-break: break-all;
    line-height: 1.3;
    margin-bottom: 25px;
    cursor: pointer;
    transition: transform 0.2s ease;
    min-height: 2.6rem;
    display: flex;
    align-items: center;
}
#ipv4-address { color: var(--accent-v4); }
#ipv6-address { color: var(--accent-v6); }

.ip-display:hover {
    transform: scale(1.02);
}

/* --- Info Details --- */
.info-block {
    width: 100%;
    border-top: 1px solid rgba(255, 255, 255, 0.04);
    padding-top: 20px;
}

.info-value {
    font-size: 0.9rem;
    color: #b0b0b0;
    line-height: 1.5;
    white-space: pre-line;
}

.click-hint {
    font-size: 0.75rem;
    color: var(--text-hint);
    text-align: center;
    margin-bottom: 35px;
}

/* --- Footer System Meta --- */
.system-meta {
    display: flex;
    justify-content: center;
    gap: 40px;
    border-top: 1px solid var(--border-color);
    padding-top: 25px;
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 10px;
}

.meta-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
}

.meta-value {
    font-size: 0.85rem;
    color: var(--text-primary);
    font-weight: 600;
}

/* --- Shimmer Loading --- */
.loading {
    color: transparent !important;
    background: linear-gradient(90deg, #1f1f1f 25%, #2a2a2a 50%, #1f1f1f 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: 6px;
}

@keyframes shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* --- Responsive Adjustments --- */
@media (max-width: 700px) {
    .dual-stack-container {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    .card {
        padding: 25px 20px;
    }
    .system-meta {
        flex-direction: column;
        align-items: center;
        gap: 12px;
    }
}